KR20210062072A - Grinding rotary tools - Google Patents

Abstract

The present invention provides an abrasive rotary tool with improved adhesion of an abrasive layer. An exemplary abrasive rotary tool includes a fastening element configured to secure an abrasive layer to the abrasive rotary tool. The securing element can be positioned over a portion of the polishing layer, such as a tab or end, so that repeated forces on the polishing layer do not disengage the polishing layer from the rotating tool. In this way, the abrasive rotary tool can maintain contact surface integrity through repeated use for an extended life of the rotary tool.

Description

Grinding rotary tools

The present invention relates to an abrasive rotary tool.

Handheld electronics, such as touchscreen smartphones and tablets, often include cover glass to provide durability and optical transparency to the device. The manufacture of cover glass can use computer numerical control (CNC) machining to ensure the consistency and mass production of features within each cover glass. Various other features, such as edge finishing of the periphery of the cover glass and camera holes, are important for strength and decorative appearance. Typically, diamond grinding tools, such as metal bonded diamond tools, are used to machine the cover glass. These tools can last for a relatively long time and can be effective at high cutting speeds. However, the tool can leave microcracks in the cover glass that become stress concentration points, which can significantly reduce the strength of the glass. To improve the strength or appearance of the cover glass, the edges can be polished. For example, polishing slurries such as cerium oxide are typically used to polish glass covers. However, slurry-based polishing can be slow and may require multiple polishing steps. Additionally, slurry polishing equipment can be large, expensive, and specific to the particular feature being polished. Overall, the slurry polishing system itself can lead to low yields, create rounded corners of the substrate to be polished, and increase labor requirements.

The present invention relates generally to an abrasive rotary tool with improved adhesion of the abrasive layer. An exemplary abrasive rotary tool includes a fastening element configured to secure an abrasive layer to the abrasive rotary tool. The securing element may be positioned over a portion of the polishing layer, such as a tab or end, so that contact forces on the polishing layer do not disengage the polishing layer from the rotating tool. In this way, the abrasive rotary tool can maintain contact surface integrity through repeated use for an extended life of the rotary tool.

In one embodiment, the abrasive rotary tool includes an abrasive assembly holder, an abrasive layer, and at least one fastening element. The polishing assembly holder includes a shank and a three-dimensional core. The shank defines the axis of rotation for the rotating tool. The three-dimensional core has an outer surface and is adjacent to the shank. The polishing layer is adjacent to the outer surface and includes a contact surface. At least one securing element is positioned over a portion of the abrasive layer and secures the abrasive layer to the abrasive assembly holder.

In another embodiment, the assembly includes a computer-controlled machining system including a computer-controlled rotating tool holder and a substrate platform, a substrate secured to the substrate platform, and an abrasive rotating tool as described above.

In another embodiment, a method for polishing a substrate includes providing a computer-controlled machining system comprising a computer-controlled rotary tool holder and a substrate platform. The method further includes securing an abrasive rotating tool as described above to a rotating tool holder of a computer-controlled machining system.

In another embodiment, a method for manufacturing an abrasive rotary tool includes positioning an abrasive layer adjacent an outer surface of a three-dimensional core of an abrasive assembly holder. The three-dimensional core is adjacent to the shank of the polishing assembly holder. The polishing layer includes a contact surface. The shank defines the axis of rotation of the rotating tool. The method further includes securing the abrasive layer to the abrasive assembly holder by placing at least one securing element over a portion of the abrasive layer.

The details of one or more embodiments of the invention are set forth in the accompanying drawings and the detailed description below. Other features, objects and advantages of the invention will be apparent from the description and drawings, and from the claims.

Like reference numerals in the drawings indicate like elements. Dotted lines represent optional or functional components, while dashed lines represent invisible components.
1A is a side view showing an assembly for polishing a substrate.
1B is a side view showing an abrasive rotating tool including a fastening element for securing an abrasive layer to an abrasive assembly holder.
Fig. 2a is a side view showing an abrasive rotary tool comprising a fastening element for securing an abrasive layer comprising longitudinal tabs.
Fig. 2B is a side view showing an abrasive rotary tool including a securing element for securing a wrapped abrasive layer.
Fig. 2c is a side view showing an abrasive rotating tool comprising a fastening element for securing an abrasive layer comprising radial tabs.
Fig. 3A is a side view showing an abrasive rotary tool including a band fixing element for holding an abrasive layer.
3B is a side view showing an abrasive rotary tool including an O-ring securing element securing an abrasive layer.
3C is a side view of an abrasive rotary tool including a sleeve securing element for securing an abrasive layer.
Fig. 3D is a side view of an abrasive rotary tool including a screw fastening element for securing an abrasive layer.
4A is a plan view showing an abrasive layer comprising circumferential tabs.
4B is a plan view showing an abrasive layer comprising radial tabs.
4C is a plan view showing an abrasive layer comprising end tabs.
5A is a cross-sectional side view showing an abrasive rotary tool including a fastening element for securing an abrasive layer.
5B is a cross-sectional side view showing an abrasive rotary tool including a fastening element for securing an abrasive layer.
5C is a cross-sectional side view showing an abrasive rotary tool including a fastening element for securing an abrasive layer.
5D is a cross-sectional side view showing an abrasive rotary tool including a fastening element for securing an abrasive layer.
6 is a diagram of a cover glass for an electronic device, for example a mobile phone, personal music player or other electronic device.
7 is a flow diagram illustrating an exemplary technique for manufacturing an abrasive rotary tool including a fastening element that secures an abrasive layer to an abrasive assembly holder.
8 is a flow diagram illustrating an exemplary technique for polishing a substrate using an abrasive rotary tool.
9A is a perspective view of an abrasive rotating tool including a sleeve securing element securing an abrasive layer comprising circumferential tabs to an abrasive assembly holder.
9B is a perspective view of the abrasive rotary tool of FIG. 9A.
9C is a perspective view of an abrasive rotary tool including an O-ring securing element securing an abrasive layer comprising circumferential tabs to an abrasive assembly holder.
Fig. 9D is a perspective view of the abrasive rotary tool of Fig. 9C.
9E is a perspective view of an abrasive rotating tool including an axial fastening element securing an abrasive layer comprising radial tabs to an abrasive assembly holder.
Fig. 9F is a perspective view of the abrasive rotary tool of Fig. 9E.
9G is a perspective view of an abrasive rotary tool including two band fastening elements securing a wound abrasive layer comprising strips to an abrasive assembly holder.
Fig. 9H is a perspective view of the abrasive rotary tool of Fig. 9G.

The present invention describes an abrasive rotary tool characterized by a fastening element that secures the abrasive layer to the abrasive rotary tool for improved adhesion of the abrasive layer.

The abrasive rotary tool includes an abrasive layer bonded to a support. The abrasive layer may be formed as a sheet and, when applied to the outer surface of the support, adhere to the support and cut into sizes and shapes that form the intended contact surface of the rotating tool. The support may have a geometric shape comprising curved surfaces and/or multiple in-plane surfaces. As such, the polishing layer may comprise a tab, strip, or other segmented surface cut to fit non-planar or multi-planar surfaces of the support. During polishing, the polishing rotary tool may undergo a force that causes portions of the polishing layer to delaminate, loosen, or otherwise disengage from the support. This problem can be exacerbated by the presence of a compressible layer behind the polishing layer, which causes the contact surface to deform to the surface of the substrate while also causing the interface between the polishing layer and the rotating tool to deform, thereby bonding the polishing layer from the support. It can increase the likelihood of disabling.

In accordance with embodiments discussed herein, an abrasive rotating tool may include a securing element configured to secure an abrasive layer to the rotating tool. The securing element may be positioned over a portion of the polishing layer, such as a tab or end, so that repeated forces on the polishing layer may be less likely to disengage the polishing layer from the rotating tool. In this way, the abrasive rotary tool can maintain contact surface integrity through repeated use for an extended life of the rotary tool.

1A shows an assembly 10 comprising a computer-controlled machining system 12 and a machining system controller 14. The controller 14 allows the machining system 12 to machine, grind or polish the substrate 16 using a rotary tool 18 mounted within the rotary tool holder 20 of the machining system 12. It is configured to transmit a control signal to the machining system 12. In one embodiment, machining system 12 is capable of performing routing, turning, drilling, milling, grinding, polishing, and/or other machining operations. , Can correspond to a CNC machine, such as a 4 or 5-axis CNC machine, and the controller 14 is a command for performing machining, grinding and/or polishing of the substrate 16 using one or more rotating tools 18. It may include a CNC controller to lower the rotary tool holder (20). The controller 14 may include general purpose computer execution software, and such a computer may be combined with a CNC controller to provide the functions of the controller 14.

The substrate 16 is mounted and secured to the substrate platform 22 in a manner that facilitates precision machining of the substrate 16 by the machining system 12. A substrate holding fixture 24 secures the substrate 16 to the substrate platform 22 and precisely positions the substrate 16 relative to the machining system 12. The substrate holding fixture 24 may also provide a reference position for a control program of the machining system 12. Although the techniques disclosed herein can be applied to a workpiece of any material, the substrate 16 may be a component for an electronic device. In some embodiments, the substrate 16 may be a display element of an electronic device, such as a transparent display element, such as a cover glass for an electronic device, or more specifically a cover glass of a smartphone touchscreen. For example, such a cover glass, rear cover or rear housing may include chamfered edges where a high degree of planarity and angularity is required.

In some embodiments, the substrate 16 includes a first major surface 2 (e.g., the top of the substrate 16), a second major surface 4 (e.g., the bottom of the substrate 16), and one or more edges. It may include a surface 6 (eg, a side surface of the substrate 16). The area of the edge surface 6 of the substrate 16 is typically less than the area of the first major surface and/or the second major surface of the substrate 16. In some embodiments, the ratio of the edge surface 6 of the substrate 16 to the area of the first major surface 2 of the substrate 16 and/or the area of the second major surface 4 of the substrate 16 The ratio of the edge surface 6 of the substrate 16 to that is greater than 0.00001, greater than 0.0001, greater than 0.0005, greater than 0.001, greater than 0.005 or even greater than 0.01; It may be less than 0.1, less than 0.05 or even less than 0.02. In some embodiments, the thickness of the edge surface 6 measured perpendicular to the first and/or second major surfaces 2, 4 is 15 mm or less, 4 mm or less, 3 mm or less, 2 mm or less, or even Less than 1 mm. The edge surface 6 intersects the first major surface 2 to form a first corner 3, and intersects the second major surface 4 to form a second corner 5. In some embodiments, the edge surface 6 may be substantially perpendicular to each of the major surfaces 2, 4, while in other examples, the edge surface 6 may comprise more than one edge surface, At least one of the more than one edge surfaces is not perpendicular (eg, a chamfered edge, a rounded edge, a curved edge or a combination of edge shapes).

In the embodiment of FIG. 1A, the rotating tool 18 can be used to improve the surface finish of machined features of the substrate 16, such as hole and edge features in the cover glass. In some embodiments, different rotating tools 18 may be used in succession to iteratively improve the surface finish of the machined feature. For example, the assembly 10 may include a first rotary tool 18 or a coarser grinding step with a set of rotary tools 18 followed by a second rotary tool 18 or of rotary tools 18. It can be used to provide a finer abrading step using a set. In some embodiments, a single rotating tool 18 may include different polishing levels to facilitate a repetitive grinding and/or polishing process with fewer rotating tools 18. Each of these embodiments provides for finishing and polishing the substrate after machining of the features of the substrate compared to other embodiments in which only a single grinding step is used to shape the surface after polishing of the substrate features in a separate polishing system. The cycle time for can be reduced.

In accordance with the embodiments discussed herein, the abrasive rotary tool 18 is configured to apply a contact pressure against the surface of the substrate 16 over a period of time while maintaining the integrity of the abrasive layer to the tool configuration. FIG. 1B is a side view showing an abrasive rotary tool 18 including a fastening element 44 that secures the abrasive layer 40 to the abrasive assembly holder 32. The abrasive rotary tool 18 of FIG. 1B illustrates the general configuration of the components of the abrasive rotary tool described herein so that other configurations may be used.

The polishing assembly holder 32 may be configured to transmit a rotational force (eg, torque) from the polishing rotary tool holder to the polishing layer. The polishing assembly holder 32 includes a shank 34 and a three-dimensional core 36. The shank 34 defines an axis of rotation for the rotating tool 18 and is coupled to the rotating tool holder 20 of FIG. 1A so that the rotational force from the rotating tool holder 20 is transmitted to the rotating tool 18. The three-dimensional core 36 is adjacent to the shank 34. The three-dimensional core 36 may comprise any volume of material comprising substantially x, y and z components. The three-dimensional core 36 includes an outer surface 38. The outer surface 38 is configured to provide a surface for bonding of the polishing layer 40. The core 36 is configured to support the polishing layer 40 by providing contact properties such as shape and hardness to the contact surface 42 of the polishing layer 40. The polishing layer 40 abuts the outer surface 38 and includes a contact surface 42. The polishing layer 40 is configured to contact the substrate at the contact surface 42 to remove material from the substrate.

The fastening element 44 is positioned over a portion of the polishing layer 40. The fixing element 44 is configured to apply a force such as a clasping or radial compressive force to a portion of the polishing layer 40 to fix the polishing layer 40 to the outer surface 38. This force resists the debonding force caused by the polishing action of the contact surface 42 on the substrate 16, thereby fixing the polishing layer 40 to the polishing assembly holder 32. In this way, the rotating tool 18 can provide a contact surface that exhibits improved service life.

The abrasive rotary tools discussed herein may utilize fastening elements to secure the various abrasive layers to the various abrasive assembly holders. 2A and 2B show two exemplary configurations of an abrasive rotary tool as discussed herein. While fastening elements such as fastening element 44 of FIG. 1B may be used to secure any polishing layer to an abrasive rotary tool, some of the anchoring elements discussed herein include a tangential or compressive force at one or more edges of the polishing layer. It can be particularly advantageous for fixing the abrasive layer that is exposed to. For example, a rotational force applied to the abrasive rotary tool and transmitted to the substrate through the abrasive layer can cause the leading edge of a portion of the abrasive layer to disengage away from the outer surface of the core of the abrasive rotary tool. By fixing these parts of the polishing layer to the outer surface by means of a fixing device, the polishing layer may better resist this peeling force and remain bonded to the outer surface.

In some examples, at least a portion of the abrasive layer includes tabs such that one or more securing elements can be configured to secure the tabs to the abrasive rotary tool. 2A is a side view showing an abrasive rotary tool 100 comprising a fastening element 114 that secures an abrasive layer 110 comprising tabs to an abrasive assembly holder 102. The polishing assembly holder 102 includes a shank 104 and a three-dimensional core 106. The shank 104 defines an axis of rotation for the rotating tool 100. The three-dimensional core 106 abuts the shank 104 and includes an outer surface 108. In the example of Fig. 2A, the three-dimensional core 106 has a cylindrical shape. The polishing layer 110 abuts the outer surface 108 and includes a contact surface 112. A fixing element 114 is positioned over at least a portion of the tabs of the polishing layer 110 to secure the tabs of the polishing layer 110 to the polishing assembly holder 102. In some examples, the three-dimensional core includes at least one sidewall adjacent the outer surface, and the fastening element secures the polishing layer to at least one sidewall of the three-dimensional core.

During operation, a tangential and/or radial polishing force between the contact surface 112 and the substrate may cause the leading edges of the tabs of the polishing layer 110 to peel away from the outer surface 108. The securing element 114 can resist this peeling action, making the tabs less likely to separate from the outer surface 108 and/or allowing them to separate from the outer surface 108 at a reduced speed.

In some examples, the securing element 114 may be positioned only over a portion of the tabs secured by the securing element 114. For example, the fixing element 114 only contacts the tabs of the polishing layer 110 such that the fixing element 114 does not contact the core 106. In some examples, the tabs of the polishing layer 110 are secured to the core 106 without overlapping the tabs of the polishing layer 110. For example, overlapping tabs may result in raised sections of the polishing layer, which may increase the rate of debonding of the overlapped tabs. By fixing the tabs of the polishing layer 110 without overlapping, the polishing layer 110 can have a reduced variation in contact pressure from the contact surface 112.

In some examples, at least a portion of the abrasive layer comprises strips such that one or more fastening elements can be configured to secure the strips to the abrasive rotary tool. FIG. 2B shows a side view of an abrasive rotary tool 120 comprising a fastening element 134 that secures a wound abrasive layer 130 comprising strips to an abrasive assembly holder 122. The polishing assembly holder 122 includes a shank 124 and a three-dimensional core 126. The shank 124 defines an axis of rotation for the rotating tool 120. The three-dimensional core 126 abuts the shank 124 and includes an outer surface 128. The polishing layer 130 abuts the outer surface 128 and includes a contact surface 132. The fastening element 134 is positioned over the strips of the polishing layer 130. The fixing element 134 secures the strips of the polishing layer 130 to the polishing assembly holder 122. In some examples, the strips of the polishing layer 130 are fixed to the core 126 without overlapping the strips of the polishing layer 130.

During operation, a tangential and/or radial polishing force between the contact surface 132 and the substrate may cause the leading edges of the strips of the polishing layer 130 to peel away from the outer surface 128, which ) Loosening and/or localized delamination of the strips. The securing element 134 can resist this peeling action, making the strips less likely to separate from the outer surface 128 and/or allowing them to separate from the outer surface 128 at a reduced rate.

In some examples, at least a portion of the abrasive layer comprises radial tabs such that one or more fastening elements can be configured to secure the radial tabs to the bottom of the abrasive rotating tool. FIG. 2C shows a side view of an abrasive rotary tool 140 comprising a fastening element 154 that secures an abrasive layer 150 comprising radial tabs to an abrasive assembly holder 142. The polishing assembly holder 142 includes a shank 144 and a three-dimensional core 146. The shank 144 defines an axis of rotation for the rotating tool 140. The three-dimensional core 146 abuts the shank 144 and includes an outer surface 148. The polishing layer 150 abuts the outer surface 148 and includes a contact surface 152. The fastening element 154 is located over the radial tabs of the polishing layer 150. The fixing element 154 secures the radial tabs of the polishing layer 150 to the bottom of the polishing assembly holder 142, for example through a pinching action. In some examples, the radial tabs of the polishing layer 150 are secured to the core 146 without overlapping the radial tabs of the polishing layer 150.

During operation, a tangential and/or radial polishing force between the contact surface 152 and the substrate may cause the leading edges of the radial tabs of the polishing layer 150 to peel away from the outer surface 148, which It may cause localized delamination of the radial tabs of 150. The securing element 154 can resist this peeling action, making the strips less likely to separate from the outer surface 148 and/or to be able to separate from the outer surface 148 at a reduced rate.

As further discussed below, a variety of fastening element designs and materials can be used to secure the abrasive layer to the abrasive assembly holder. Since the fixing element is configured to fix the polishing layer to the three-dimensional core, the design and properties of the fixing element may include characteristics of the three-dimensional core, such as shape, contour and elasticity; Properties of the substrate to be polished by the abrasive rotary tool, such as coefficient of friction; Characteristics of the polishing layer of the polishing rotary tool; The properties of the adhesive between the polishing layer and the outer surface of the core, such as peel strength; It may be selected based on various design and operating factors of and/or relating to the abrasive rotary tool, including, but not limited to, the characteristics of the assembly that operates the abrasive rotary tool, such as, for example, an expected torque, and the like.

In some examples, the securing element secures the abrasive layer to the rotating tool using a radial force directed towards the axis of rotation of the rotating tool. For example, a cylindrical rotating tool may have circumferential tabs extending axially down along the rotating tool as shown in FIG. 4A so that the fixing element is positioned around the rotating tool and exerts a radial force into the rotating tool. It is applied so that the circumferential tabs can be fixed against the rotating tool. In some examples, the securing element is at least one of an O-ring, a band, a wrap, a heat shrinkable sleeve, and a flange.

3A-3C illustrate various bands, O-rings, and sleeve fixing elements, respectively, that may be used to secure the polishing layer to the polishing assembly holder. Each of the abrasive rotary tools 200A, 200B and 200C includes an abrasive assembly holder 202 and an abrasive layer 210. The polishing assembly holder 202 includes a three-dimensional core 206 adjacent the shank 204 and comprising an outer surface 208. The polishing layer 210 abuts the outer surface 208 and includes a contact surface 212. Respective fastening elements 214A, 214B, 214C are positioned over the polishing layer 210 to secure the polishing layer 210.

3A shows a side view of an abrasive rotary tool 200A including a band fixing element 214A that secures the abrasive layer 210. The band fixing element 214A can have a large surface area in contact with the polishing layer 210, so that the band fixing element 214A can be held in the same position during polishing. Band fixation element 214A may include, for example, a rubber/elastic band, heat shrink wrap, or a circumferential layer having a substantially flat surface in contact with the polishing layer 210.

3B shows a side view of an abrasive rotary tool 200B including an O-ring securing element 214B securing an abrasive layer 210. The O-ring fixing element 214B can have a low roll resistance, such that the O-ring fixing element 214B can be easily placed onto the polishing layer 210 during manufacturing, for example. O-ring fastening element 214B can also be conventional and durable. In some examples, the O-ring retention element 214B is into a recess to assist in positioning the O-ring retention element 214B and to assist in holding the O-ring retention element 214B in place. It can be configured to fit.

3C shows a side view of an abrasive rotary tool including a sleeve securing element 214C for securing an abrasive layer 210. The sleeve fixing element 214C can have a very large surface area in contact with the polishing layer 210, the outer surface 208, and the shank 204, such that the sleeve fixing element 214C is axially away from the shank 204. Provides a force against the movement of the polishing layer 210 into and thereby making it possible to secure the polishing layer 210 to the polishing assembly holder 202 and shank 204. For example, sleeve securing element 214C may be coupled to shank 204 to cover abrasive layer 210 to secure tabs of abrasive layer 210 while holding sleeve securing element 214C in place. The sleeve fixing element 214C may be particularly useful for curved portions of an abrasive tool with irregular contours.

3D shows a side view of an abrasive rotary tool 200D comprising an axial fastening element 214D for securing an abrasive layer 210. The abrasive rotary tool 200D includes an abrasive assembly holder 202 and an abrasive layer 210. The polishing layer 210 may have radial tabs extending radially across the end of the rotating tool 200D. The polishing assembly holder 202 includes a three-dimensional core 206 adjacent the shank 204 and comprising an outer surface 208. The axial fastening element 214D is located within the core 206 at the end of the rotating tool 200D and can apply an axial force into the core 206. The axial fastening element 214D may comprise, for example, a screw, a tack, or other fastening element that provides an axial force against a rotating tool. For example, the fastening element may be a screw or thumbtack inserted into the end of the rotating tool to pinch the tabs of the polishing layer against the rotating tool. The axial fixation element 214D can be recessed into the rotary tool 200D so that the entire contact surface 212 on the side or bottom of the rotary tool 200D contacts the substrate without interference from the axial fixation element 214D. To be able to do it.

Although not shown in FIGS. 3A-3D, in some examples, the fastening element may be a clamp, wrap, tape, or other fastening element that supplies a force to resist the separating force. For example, the fastening element may be a clamp that is closed based on a clamping mechanism having a first unclamped state and a second clamped state. As another example, the fastening element may be a tape or wrap wound around a portion of the abrasive layer and secured by a fastening mechanism such as an adhesive or interlayer friction.

A variety of materials can be used to form the fastening element. In some examples, the securing element is at least one of an elastomer, plastic, tape, metal, or any other material capable of applying a securing force to secure the abrasive layer to the outer surface of the core. For example, elastomers or plastics may have high elasticity, allowing the fastening elements to be used in various shapes and sizes of rotating tools and/or to maintain a relatively constant force against the polishing layer. Elastomers that can be used include, but are not limited to, polyisoprene, polybutadiene, latex rubber, silicone, polyurethane, and the like. Plastics that can be used include, for example, shrink wrap plastics that can shrink when exposed to heat. As another example, the metal may have low elasticity, allowing the fixing element to exert a force on the polishing layer and/or to remain rigid during polishing. Metals that can be used include, but are not limited to, aluminum, steel, and the like.

The fastening elements discussed herein can have a variety of sizes. In some examples, the securing element may be about 0.1 cm to about 5 cm wide. In some examples, the width of the securing element can be selected to provide adequate adhesion while reducing the amount of surface area of the contact surface covered by the securing element. In some examples, the securing element can be between about 0.1 mm and about 1 cm thick.

The fixing elements discussed herein can be located at various locations on the polishing layer. In some examples, the fixation element is positioned on any portion of the polishing layer such that the fixation element provides a radial force towards the axis of rotation of the abrasive rotary tool, an axial force along the axis of rotation, or a combination of both. Can be. In some examples, the securing element may be positioned on a portion of the polishing layer such that the securing element provides an axial force.

As described above, the polishing layer can be configured to fit the shape of the three-dimensional core of the polishing rotary tool. Correspondingly, the fixing element may be configured to fix the polishing layer to the three-dimensional core such that the polishing layer is fixed to the core. As such, various shapes and configurations of the polishing layer can be used in the polishing rotary tools discussed herein. 4A-4C show various configurations of polishing layers that may be used.

4A is a plan view showing a polishing layer 300 comprising circumferential tabs 306. The circumferential tab may be a tab positioned along the circumference of the three-dimensional core in the axial direction when applied to a three-dimensional core such as the three-dimensional core 36 of FIG. 1B. For example, the polishing layer 110 of FIG. 2A may have a shape similar to that of the polishing layer 300 when it is flat. Once applied to a three-dimensional core, such as a cylindrical or bulbous core, the polishing layer 300 can have a contact surface 302 facing out from the core. The securing element may secure the abrasive layer 300 to the core at a portion 304 of the circumferential tab 306 of the abrasive layer 300.

4B shows a top view of an abrasive layer 310 comprising radial tabs 316. When applied to the three-dimensional core, the radial tab may be a tab positioned along a radius toward the axis of rotation. Once applied to a three-dimensional core, such as a cylindrical core, the polishing layer 310 can have a contact surface 312 facing out from the core. The securing element can secure the abrasive layer 310 to the core at a portion 314 of the radial tab 316 of the abrasive layer 310, see, for example, FIG. 2C. When the polishing layer 150 of FIG. 2C is flat, it may have a shape similar to that of the polishing layer 310.

4C shows a top view of an abrasive layer 320 comprising a wound strip. The wound strip, when applied to the three-dimensional core, may be a strip positioned along the circumference of the three-dimensional core in a helical direction. For example, the polishing layer 130 of FIG. 2B may have a shape similar to that of the polishing layer 320 when it is flat. Once applied to a three-dimensional core, such as a cylindrical core, the polishing layer 320 can have a contact surface 322 facing out from the core. The two fastening elements can fasten the polishing layer 320 to the core at a portion 324 on each end of the polishing layer 320.

A rotating tool as discussed herein can include any number of abrasive layers. In some examples, multiple polishing layers may be used on the same rotating tool. For example, the rotating tool may have a first polishing layer having a first set of polishing properties (eg, roughness, etc.), and a second polishing layer having a second set of polishing characteristics. One or more of the plurality of abrasive layers may be secured to the rotating tool using a securing element as discussed herein. For example, a first abrasive layer on a portion of the core proximal to the shaft may be secured by a band fixing element, while a second abrasive layer on a portion of the core distal to the shaft may be secured to the axial fixation element. Can be fixed by

A polishing layer as discussed herein, such as polishing layer 40, includes a contact surface such as a contact surface 42 configured to contact and polish one or more surfaces of a substrate. Polishing can include grinding, polishing, and any other actions that remove material from the substrate. As will be appreciated by those skilled in the art, the contact surface can be formed according to a variety of methods including, for example, molding, extrusion, embossing and combinations thereof.

The polishing layer is not particularly limited and may include traditional coated and structured abrasives (e.g., TRIZACT ABRASIVE, available from 3M Company, St. Paul, Minnesota). However, it is not limited to this. The polishing layer may include a base layer, such as a backing layer; And a contact layer. The base layer may be formed of a polymeric material. For example, the base layer may be a thermoplastic material such as polypropylene, polyethylene, polyethylene terephthalate, or the like; Thermosetting materials such as polyurethane and epoxy resin; Or it may be formed of any combination thereof. The base layer can include any number of layers. The thickness of the base layer (i.e., the dimension of the base layer in a direction perpendicular to the first and second major surfaces) is less than 10 mm, less than 5 mm, less than 1 mm, less than 0.5 mm, less than 0.25 mm, 0.125 mm Less than, or less than 0.05 mm.

In some examples, the contact surface of the polishing layer comprises a microstructured surface. The microstructured surface may include microstructures configured to increase the contact pressure of the contact surface on one or more surfaces of the substrate. In some embodiments, the microstructured surface may include a plurality of cavities interspaced between the outermost abrasive material of the polishing layer. For example, the shape of the cavity may be cubic, cylindrical, prismatic, hemispherical, rectangular, pyramidal, truncated pyramidal, conical, truncated cone, cruciform, arcuate or post-like with a flat bottom surface, or It can be selected from a number of geometric shapes, such as a combination of these. Alternatively, some or all of the cavities may have an irregular shape. In various embodiments, one or more of the side or inner walls forming the cavity may be perpendicular to the upper major surface, or alternatively be tapered in either direction (i.e. towards the bottom of the cavity or the cavity Towards the top of the-towards the main surface-can be tapered). The angle forming the taper may range from about 1 to 75 degrees, from about 2 to 50 degrees, from about 3 to 35 degrees, or from about 5 to 15 degrees. The height or depth of the cavities is at least 1 micron, at least 10 microns, or at least 500 microns, or at least 1 mm; It may be less than 10 mm, less than 5 mm, or less than 1 mm. The height of the cavities may be the same, or one or more of the cavities may have a different height than any number of other cavities. In some embodiments, the cavities may be provided in an arrangement in which the cavities are arranged in an aligned row and column. In some cases, one or more rows of cavities may be directly aligned with adjacent rows of cavities. Alternatively, one or more rows of cavities may be offset from adjacent rows of cavities. In other embodiments, the cavities may be arranged in a spiral, helix, corkscrew or lattice manner. In yet another embodiment, the complexes may be arranged in a “random” array (ie, not in an organized pattern).

In some examples, the contact surface includes a plurality of precisely shaped abrasive composites. "Precisely shaped abrasive composite" refers to an abrasive composite having a shaped shape that is an inverse phase of a mold cavity that is retained after removal of the composite from the mold; Preferably, as described in U.S. Patent No. 5,152,917 (Pieper et al.), which is incorporated herein by reference in its entirety, the composite is substantially free of abrasive particles protruding over the exposed surface of the shape before the polishing layer is used. There is no. The plurality of precisely shaped abrasive composites may comprise a combination of abrasive particles and a resin/binder to form a fixed abrasive. In some embodiments, the contact surface 70 may be formed as a two-dimensional abrasive material, such as an abrasive sheet, in which a layer of abrasive particles is held in the backing by one or more layers of resin or other binder. Alternatively, the contact surface may be formed as a three-dimensional abrasive material, such as a resin or other binder layer comprising abrasive particles dispersed therein, and through a molding or embossing process (to form a microstructured surface). It is formed into a structure, for example, followed by curing, crosslinking and/or crystallization of the resin to solidify and maintain the three-dimensional structure. The three-dimensional structure may include a plurality of precisely shaped abrasive composites. In both embodiments, the contact surface may comprise an abrasive composite having an appropriate height to allow the abrasive composite to wear during use and/or dressing to expose a new layer of abrasive particles. The abrasive layer may comprise a three-dimensional, textured, flexible, fixed abrasive composition comprising a plurality of precisely shaped abrasive composites. The precisely shaped abrasive composites can be arranged in an array to form a three-dimensional, textured, flexible fixed abrasive configuration. The abrasive layer may comprise a patterned abrasive composition. An exemplary patterned abrasive is an abrasive layer available from 3M Company of St. Paul, Minnesota under the tradenames Tri-Jact Patterned Abrasive and Tri-Jact Diamond Tile Abrasive. The patterned abrasive layers are precisely aligned and comprise monolithic rows of abrasive composites made from dies, molds, or other techniques.

The shape of each precisely shaped abrasive composite can be selected for a particular application (eg, workpiece material, work surface shape, contact surface shape, temperature, dendritic material). The shape of each precisely shaped abrasive composite can be any useful shape, such as cubic, cylindrical, prismatic, right parallelepiped, pyramidal, truncated pyramidal, conical, hemispherical, truncated cone, cruciform, or It may be a post-like section with a distal end. The complex pyramid can have, for example, 3, 4 sided, 5 sided, or 6 sided. The cross-sectional shape of the abrasive composite at the base may be different from the cross-sectional shape at the distal end. The transition between these shapes can be smooth and continuous, or can be made in separate steps. The precisely shaped abrasive composite can also have a mixture of different shapes. The precisely shaped abrasive composites may be arranged in a row, spiral, helix, or lattice manner, or may be randomly arranged. The precisely shaped abrasive composite may be arranged in a design intended to guide fluid flow and/or facilitate debris removal.

The precisely shaped abrasive composite may be set out in a predetermined pattern or at a predetermined location within the polishing layer. For example, when the polishing layer is made by providing an abrasive/resin slurry between the backing and the mold, the predetermined pattern of the precisely shaped abrasive composite will correspond to the pattern of the mold. Thus, the pattern is reproducible between polishing layers. The predetermined pattern may be an array or arrangement, meaning that the complexes are aligned rows and columns, or designed arrays such as alternating offset rows and columns. In other embodiments, the abrasive composites may be arranged in a “random” array or pattern. This means that the complexes are not a regular array of rows and rows as described above. However, it should be understood that such a “random” array is a predetermined pattern in that the position of the precisely shaped abrasive composite is predetermined and corresponds to the mold.

The abrasive material forming the contact surface of the abrasive layer may comprise a polymeric material such as a resin. In some embodiments, the resinous phase may comprise a cured or curable organic material. The method of curing is not critical and may include curing through energy such as UV light or heat, for example. Examples of suitable resinous materials are, for example, amino resins, alkylated urea-formaldehyde resins, melamine-formaldehyde resins, alkylated benzoguanamine-formaldehyde resins, acrylate resins (including acrylates and methacrylates). , Phenolic resins, urethane resins, and epoxy resins.

Examples of suitable abrasive particles for the polishing layer include cubic boron nitride, molten aluminum oxide, ceramic aluminum oxide, heat-treated aluminum oxide, white molten aluminum oxide, black silicon carbide, green silicon carbide, titanium diboride, boron carbide, silicon nitride, tungsten carbide. , Titanium carbide, diamond, cubic boron nitride, hexagonal boron nitride, alumina zirconia, iron oxide, ceria, garnet, molten alumina zirconia, alumina sol gel derived abrasive particles, and the like. The alumina abrasive particles may contain a metal oxide modifier. The diamond and cubic boron nitride abrasive particles may be monocrystalline or polycrystalline. Other examples of suitable inorganic abrasive particles include silica, iron oxide, chromia, ceria, zirconia, titania, tin oxide, gamma alumina, and the like. The abrasive particles may be abrasive agglomerate particles. The abrasive agglomerate particles typically include a plurality of abrasive particles, a binder, and optional additives. The binder can be organic and/or inorganic. The abrasive aggregates may be shaped at random or may have a predetermined shape associated with them.

In some embodiments, the abrasive layer comprising the resin, abrasive particles, and any additional additives dispersed within the resin can be a coating on the rigid support layer. In some specific embodiments, the polishing layer may be formed from an abrasive composite layer deposited on the base layer, and the base layer may include a primer layer between the abrasive composite layer and the base layer. The base layer itself may be positioned over the backing layer, with an adhesive securing the base layer to the backing layer.

5A-5D show various configurations of a three-dimensional core that can be used. 5A is a cross-sectional side view of an abrasive rotary tool 400 including a fastening element 414 that secures an abrasive layer 410 to an abrasive assembly holder 402. The polishing assembly holder 402 includes a shank 404 and a three-dimensional core 406. The shank 404 defines an axis of rotation for the rotating tool 400. The three-dimensional core 406 abuts the shank 404 and includes an outer surface 408. The polishing layer 410 includes a contact surface 412 adjacent to the outer surface 408 and disposed away from the outer surface 408. The fixing element 414 is positioned over at least a portion of the polishing layer 410 to secure the polishing layer 410 to the polishing assembly holder 402. An adhesive layer 417 is disposed between the polishing layer 410 and the outer surface 408 of the three-dimensional core 406. The three-dimensional core 406 includes at least one sidewall 409 adjacent the outer surface 408, and the fixing element 414 incorporates the polishing layer 410 into one sidewall 409 of the three-dimensional core 406. Fix it on. The sidewall 409 may include any structure that provides a support surface on one side of the abrasive rotating tool 400. In the example of FIG. 5A, the three-dimensional core 406 includes an inner layer 418 and an outer layer 416. In some examples, the shank 404 and at least a portion of the core 406, such as the inner layer 418, are metal. For example, as shown in Fig. 5A, the shank 404 and the inner layer 418 are monolithic. In some embodiments, shank 404 and inner layer 418 are not monolithic and may be constructed of different materials.

5B is a cross-sectional side view of an abrasive rotary tool 420 including a fastening element 434 that secures the abrasive layer 430 to the abrasive assembly holder 422. The polishing assembly holder 422 includes a shank 424 and a three-dimensional core 426. The shank 424 defines an axis of rotation for the rotating tool 420. The three-dimensional core 426 abuts the shank 424 and includes an outer surface 428. The polishing layer 430 includes a contact surface 432 adjacent to the outer surface 428 and disposed away from the outer surface 428. The fixing element 434 is positioned over at least a portion of the polishing layer 430 to secure the polishing layer 430 to the polishing assembly holder 422. In the example of FIG. 5B, the three-dimensional core 426 includes a maximum radial dimension D _c and the shank 424 includes a maximum radial dimension D _s , so that the maximum radial dimension of the core 426 Make (D _c ) greater than the maximum radial dimension (D _{s) of the shank 424.}

5C is a cross-sectional side view of an abrasive rotary tool 440 including a fastening element 454 that secures the abrasive layer 450 to the abrasive assembly holder 442. The polishing assembly holder 442 includes a shank 444 and a three-dimensional core 446. The shank 444 defines an axis of rotation for the rotating tool 440. The three-dimensional core 446 abuts the shank 444 and includes an outer surface 448. The polishing layer 450 includes a contact surface 452 adjacent to the outer surface 448 and disposed away from the outer surface 448. The fixing element 454 is positioned over at least a portion of the polishing layer 450 to secure the polishing layer 450 to the polishing assembly holder 442. In the example of FIG. 5C, the outer layer 456 of the core 446 includes a retaining channel 458 such that the securing element 454 is received within at least a portion of the retaining channel 458.

5D is a cross-sectional side view of an abrasive rotary tool 460 including a fastening element 474 that secures the abrasive layer 470 to the abrasive assembly holder 462. The polishing assembly holder 462 includes a shank 464 and a three-dimensional core 466. Shank 464 defines an axis of rotation for rotating tool 460. The three-dimensional core 466 abuts the shank 464 and includes an outer surface 468. The polishing layer 470 includes a contact surface 472 adjacent to the outer surface 468 and disposed away from the outer surface 468. The fixing element 474 is positioned over at least a portion of the polishing layer 470 to secure the polishing layer 470 to the polishing assembly holder 462. In the example of FIG. 5D, the three-dimensional core 466 includes a maximum radial dimension D _c and the shank 464 includes a maximum radial dimension D _s . The radial dimension D _c of the core 466 is smaller than the radial dimension D _{s of the shank 464.}

In some examples, the abrasive rotary tool can include a layer of adhesive between the abrasive layer and the outer surface of the core. For example, as further described in FIG. 7, prior to bonding the polishing layer to the outer surface, an adhesive layer may be applied to the rear surface of the polishing layer, the outer surface of the core, or both. In some examples, the adhesive layer comprises a pressure sensitive adhesive.

The three-dimensional core of the abrasive rotary tool discussed herein can have a variety of shapes. In some examples, the shape of the three-dimensional core may be at least one of cylindrical, bulbous, conical, cup-shaped, and the like. The three-dimensional core of the abrasive rotary tool discussed herein can be formed from a variety of materials. In some examples, the three-dimensional core comprises a metal, such as aluminum 6061, 2011, or 2024 or steel 4140, W1, or 01; Plastics such as nylon, polycarbonate, or acrylic; At least one of elastomers such as nitrile, fluoroelastomer, chloroprene, epichlorohydrin, silicone, urethane, polyacrylate, EPDM (ethylene propylene diene monomer) rubber, SBR (styrene butadiene rubber), butyl rubber, etc. Includes one. In some embodiments, the three-dimensional core may comprise foam, such as foam rubber.

In some examples, a three-dimensional core may include more than one layer. For example, the three-dimensional core may include metal and elastomer or plastic and elastomer. In some examples, for example FIGS. 5A and 5C, the inner and outer layers of the core comprise a rigid layer and an elastic layer, respectively, such that the elastic layer comprises the outer surface of the core. The rigid layer may be configured to provide support to the polishing layer during polishing to the surface of the substrate to be polished by the polishing rotary tool, such that the contact surface remains substantially flat. For example, the rigid layer may comprise a material having a high hardness and/or a high modulus of elasticity. The elastic layer can be configured to compress during polishing of the substrate, allowing the contact surface to have a more consistent contact with the substrate. For example, the elastic layer may comprise a material having a low hardness and/or a low elastic modulus. In some embodiments, the tensile modulus of the rigid layer is greater than the tensile modulus of the elastic layer. For example, the tensile modulus of the rigid layer can be 2 times, 5 times 10 times, 50 times or even 100 times greater than the tensile modulus of the elastic layer.

In some embodiments, each of the rigid and elastic layers, or any other layer of the three-dimensional core, may be composed of a material selected according to ductility. The ductility of a material can be correlated with that of the material, in general, a softer material can have a higher consistency at a given contact pressure. The ductility is indicated by and can be selected based on the various properties of the respective materials of the rigid support layer and the elastic layer. For example, a softer material may be a material with a lower hardness (represented using any suitable hardness scale such as Shore A or Shore OO), a material with a lower elastic modulus, and a higher compressibility (represented by using any suitable hardness scale such as Shore A or Shore OO). It may be a material, typically quantified through Poisson's ratio or deflection of the material), or a material with a modified structure, including a plurality of gaseous inclusions such as, for example, foam.

In some embodiments, each of the rigid and elastic layers may be composed of a material selected according to the hardness. The hardness may represent a measure of each of the rigid support layer and the elastic layer that deforms in response to a force. In some cases, hardness is most appropriately determined using different scales for the rigid support layer and the elastic layer (e.g., the Shore A durometer for the elastic layer and the Rockwell scale for the rigid support layer). Can be. In some examples, the elastic layer has a Shore A hardness of less than 80. In some examples, the three-dimensional core, such as an elastic layer, a rigid layer, or both, has a Shore A hardness greater than 25. In some embodiments, at least one of the Shore A, Shore D, and Shore OO hardness of the rigid layer is greater than the corresponding Shore A, Shore D, or Shore OO hardness of the elastic layer.

In some examples, the three-dimensional core includes a rigid layer comprising at least one of a plastic layer and a metal layer adjacent to the elastic layer. In some examples, the shank and at least a portion of the three-dimensional core are monolithic. In some examples, the elastic layer includes at least one of an elastomer, foam, fabric, or nonwoven material. Suitable elastomers are, for example, nitrile, fluoroelastomer, chloroprene, epichlorohydrin, silicone, urethane, polyacrylate, EPDM (ethylene propylene diene monomer) rubber, SBR (styrene butadiene rubber), butyl rubber, etc. It may contain the same thermosetting elastomer.

In various embodiments, an abrasive rotary tool as described herein may be suitable for an edge or major surface grinding a cover glass. For example, the cover glass may include a variety of surfaces that can cause high pressure on a small surface area to create a high peel force on the polishing layer of the polishing rotary tool. 6 shows a cover glass for an electronic device, for example a mobile phone, personal music player or other electronic device. In some embodiments, the cover glass 500 may be a component of a touch screen for an electronic device. The cover glass 500 may be an alumina-silicate based glass having a thickness of less than 1 mm, but other configurations are also possible, such as a thickness of less than 5 mm, less than 4 mm, less than 3 mm or even less than 2 mm.

Cover glass 500 includes a first major surface 502 opposite the second major surface 504. Generally, but not always, major surfaces 502 and 504 are flat surfaces. The edge surface 506 follows the perimeter of the major surfaces 502 and 504, and the perimeter includes rounded corners 508. The edge surface 506 intersects the first major surface 502 at the first corner and the second major surface 504 at the second corner, with the first and second corners generally around the entire periphery of the substrate. Is extended.

In order to provide increased resistance to cracking and an improved appearance, the surfaces of the cover glass 500, including the major surfaces 502, 504 and edge surfaces 506, are smoothed to the extent feasible during the manufacture of the cover glass 500. It should be. In addition, as disclosed herein, abrasive rotary tools can be used to reduce edge surface roughness such as edge surfaces 506 and corners 508 using a CNC machine. Since the contact surface of the polishing layer can be maintained as the polishing layer remains bonded to the polishing rotary tool, the polishing rotary tool with improved adhesion of the polishing layer makes the edge surface 506 and corner 508 more consistent. It can be polished.

7 is a flow diagram illustrating an exemplary technique for manufacturing an abrasive rotary tool including a fastening element that secures an abrasive layer to an abrasive assembly holder. Although the technique of FIG. 7 will be described with reference to the abrasive rotary tool 18 of FIG. 1B, other components and abrasive rotary tools may be used.

In some examples, the method includes a step 600 of cutting the abrasive material to form an abrasive layer, such as an abrasive layer 40. For example, a rotary die cutting machine can cut a sheet of abrasive material to form the abrasive layer 40. The die cuts the polishing layer 40 so that after bonding of the polishing layer 40 to a three-dimensional core, such as a three-dimensional core 36, the polishing layer 40 forms a desired contact surface, such as the contact surface 42. Can be configured to

In some examples, the method includes applying an adhesive to at least one of the outer surface 38 and the polishing layer 40 prior to placing the polishing layer 40 on the outer surface 38. For example, an adhesive layer is applied to one or both of the polishing layer 40, the backing surface opposite the contact surface 42, and/or the outer surface 38 to use the adhesive force of the adhesive layer 40 ) Can be fixed to the outer surface 38. In some examples, the adhesion of the adhesive layer is less than the total holding force required to secure the abrasive layer 40 to the abrasive rotary tool 18 for a desired period of operation. In some examples, the polishing layer 40 may already include an adhesive, such as an adhesive backing.

The method includes a step 610 of positioning the polishing layer 40 adjacent the outer surface 38 of the three-dimensional core 36 of the polishing assembly holder 32. For example, the backing surface of the polishing layer 40 may substantially contact the outer surface 38 of the core 36, for example more than 90% of the backing surface contacts the outer surface 38.

The method includes a step 620 of securing the polishing layer 40 to the polishing assembly holder 32 by placing at least one fastening element 44 over a portion of the polishing layer 40. For example, the fixing element 44 may be arranged such that the polishing layer 40 is fixed to the polishing assembly holder 32 or clamped, contracted, cured or heated, or the fixing element 44 is placed on the polishing layer 40. It can be subjected to any other action of positioning.

8 is a flow diagram illustrating an exemplary technique for polishing a substrate using an abrasive rotary tool. Although the technique of FIG. 8 will be described with reference to the operator manipulating assembly 10 of FIG. 1A, other assemblies and agents of operation may be used. The operator provides (700) a computer-controlled machining system (12) that includes a computer-controlled rotary tool holder (20) and a substrate platform (22). The operator secures the abrasive rotary tool to the rotary tool holder 20 of the computer-controlled machining system 12 (710). As described herein, an abrasive rotary tool includes at least one securing element positioned over a portion of the abrasive layer to secure the abrasive layer to the abrasive assembly holder of the abrasive rotary tool. An operator operates a computer-controlled machining system 12, for example via a controller 14, to grind one or more surfaces of a substrate 720, such as substrate 16 of FIG. 1A, with an abrasive rotary tool. The operator can continue grinding with the grinding rotary tool until the grinding rotary tool needs to be replaced. In the case of the abrasive rotary tool discussed herein, which includes a fastening element for securing the abrasive layer to the rotary tool, the period for replacement of the abrasive rotary tool does not include a fastening element for securing the abrasive layer. Can be larger than

Selected embodiments of the invention include, but are not limited to:

In a first embodiment, the present invention is an abrasive rotary tool,

A shank defining an axis of rotation for the rotating tool, and

Three-dimensional core with outer surface adjacent to the shank

Polishing assembly holder comprising a;

An abrasive layer adjacent the outer surface and comprising a contact surface; And

At least one fastening element positioned over a portion of the polishing layer to secure the polishing layer to the polishing assembly holder

Containing, it provides an abrasive rotary tool.

In a second embodiment, the present invention is an abrasive rotary tool according to the first embodiment, wherein the three-dimensional core comprises at least one sidewall adjacent to the outer surface, and the fixing element comprises a polishing layer at least one sidewall of the three-dimensional core. Fixing to, to provide an abrasive rotary tool.

In a third embodiment, the present invention provides an abrasive rotary tool according to the first or second embodiment, wherein at least a portion of the polishing layer comprises tabs.

In a fourth embodiment, the present invention provides an abrasive rotary tool according to the third embodiment, wherein the fixing element is positioned over at least a portion of the tabs.

In a fifth embodiment, the present invention provides an abrasive rotary tool according to the fourth embodiment, wherein the fixing element is located only over at least a portion of the tabs.

In a sixth embodiment, the present invention provides an abrasive rotary tool according to any one of the first to fifth embodiments, wherein the polishing layer is fixed to the three-dimensional core without overlapping the polishing layers. do.

In a seventh embodiment, the present invention is an abrasive rotary tool according to any one of the first to sixth embodiments, wherein the contact surface of the polishing layer comprises a microstructured surface. Provides.

In an eighth embodiment, the present invention provides an abrasive rotary tool according to any one of the first to seventh embodiments, wherein the contact surface comprises a plurality of precisely shaped abrasive composites. do.

In a ninth embodiment, the present invention provides an abrasive rotary tool according to any one of the first to eighth embodiments, wherein at least a portion of the shank and the three-dimensional core is a single chain.

In a tenth embodiment, the present invention is an abrasive rotary tool according to any one of the first to ninth embodiments, wherein the fixing element is at least one of elastomer, plastic, tape, and metal. Provides.

In an eleventh embodiment, the present invention provides an abrasive rotary tool according to the tenth embodiment, wherein the elastomer is at least one of an O-ring, a band, a wrap, a heat shrinkable sleeve, and a flange.

In a twelfth embodiment, the present invention provides an abrasive rotary tool according to the tenth embodiment, wherein the plastic is at least one of an O-ring, a band, a wrap, a heat-shrinkable sleeve, and a flange.

In a thirteenth embodiment, the present invention provides an abrasive rotary tool according to the tenth embodiment, wherein the fixing element is positioned only over at least a portion of the tabs.

In a fourteenth embodiment, the present invention is an abrasive rotary tool according to any one of the first to thirteenth embodiments, wherein the three-dimensional core comprises at least one of metal, elastomer, and plastic, Provide tools.

In a fifteenth embodiment, the present invention is an abrasive rotary tool according to any one of the first to fourteenth embodiments, wherein the three-dimensional core comprises metal and elastomer or plastic and elastomer. Provides.

In a sixteenth embodiment, the present invention provides an abrasive rotary tool according to any one of the first to fifteenth embodiments, wherein the three-dimensional core comprises an elastic layer comprising an outer surface. do.

In a seventeenth embodiment, the present invention provides an abrasive rotary tool according to the sixteenth embodiment, wherein the three-dimensional core comprises at least one of a plastic layer and a metal layer adjacent to the elastic layer.

In an eighteenth embodiment, the present invention provides an abrasive rotary tool according to a sixteenth or seventeenth embodiment, wherein the elastic layer has a Shore A hardness of less than 80.

In a nineteenth embodiment, the present invention is an abrasive rotary tool according to any one of the sixteenth to eighteenth embodiments, wherein the elastic layer comprises at least one of an elastomer, foam, cloth, or nonwoven material, Provides abrasive rotary tools.

In a twentieth embodiment, the present invention provides an abrasive rotary tool according to any one of the first to nineteenth embodiments, wherein the three-dimensional core has a Shore A hardness of greater than 25.

In a twenty-first embodiment, the present invention is an abrasive rotary tool according to any one of the first to twentieth embodiments, wherein the three-dimensional core includes a maximum radial dimension, and the shank includes a maximum radial dimension. And the maximum radial dimension of the core is larger than the maximum radial dimension of the shank, providing an abrasive rotary tool.

In a 22nd embodiment, the present invention is an abrasive rotary tool according to any one of the first to twentieth embodiments, wherein the three-dimensional core includes a maximum radial dimension, and the shank includes a maximum radial dimension. And the radial dimension of the core is smaller than or equal to the radial dimension of the shank, providing an abrasive rotary tool.

In a twenty-third embodiment, the present invention provides an abrasive rotary tool according to any one of the first to twenty-second embodiments, wherein at least a portion of the core and the shank are metal.

In a twenty-fourth embodiment, the present invention is a polishing rotary tool according to any one of the first to twenty-third embodiments, further comprising an adhesive layer disposed between the polishing layer and the outer surface of the core, Provide tools.

In a twenty-fifth embodiment, the present invention provides an abrasive rotary tool according to the twenty-fourth embodiment, wherein the adhesive layer comprises a pressure sensitive adhesive.

In a twenty-sixth embodiment, the present invention provides an abrasive rotary tool according to any one of the first to twenty-fifth embodiments, wherein the core includes a retaining channel.

In a twenty-seventh embodiment, the present invention provides an abrasive rotary tool according to the twenty-sixth embodiment, wherein the fixing element is accommodated in at least a portion of the retaining channel.

In a twenty-eighth embodiment, the present invention is an assembly,

A computer-controlled machining system including a computer-controlled rotary tool holder and a substrate platform;

A substrate fixed to the substrate platform; And

Abrasive rotary tool according to any one of the first to 27th embodiments

It provides an assembly comprising a.

In a 29th embodiment, the present invention provides an assembly according to the 28th embodiment, wherein the substrate is a component for an electronic device.

In a thirtieth embodiment, the present invention provides an assembly according to the twenty-ninth embodiment, wherein the component for an electronic device is a transparent display element.

In a 31st embodiment, the present invention is a method for polishing a substrate, comprising:

Providing a computer-controlled machining system comprising a computer-controlled rotating tool holder and a substrate platform;

Securing the abrasive rotary tool to a rotary tool holder of a computer-controlled machining system, the abrasive rotary tool comprising:

A shank defining an axis of rotation for the rotating tool, and

Three-dimensional core with outer surface adjacent to the shank

Polishing assembly holder comprising a;

An abrasive layer adjacent the outer surface and comprising a contact surface; And

At least one fastening element positioned over a portion of the polishing layer to secure the polishing layer to the polishing assembly holder

Including -;

Operating a computer-controlled machining system to polish the contact surface of the substrate using the polishing layer of the polishing rotary tool.

It provides a method comprising a.

In a 32nd embodiment, the present invention is a method according to the 31st embodiment,

Positioning the polishing layer adjacent to the outer surface of the three-dimensional core of the polishing assembly holder-the three-dimensional core is adjacent to the shank of the polishing assembly holder, the polishing layer comprises a contact surface, and the shank defines the axis of rotation of the rotating tool. Ham -; And

Placing at least one fastening element over a portion of the polishing layer to secure the polishing layer to the polishing assembly holder.

It provides a method further comprising.

In a thirty-third embodiment, the present invention provides an assembly according to the thirty-second embodiment, further comprising applying an adhesive to at least one of the outer surface and the polishing layer prior to positioning the polishing layer.

Example

The practice of the present invention will be further described in connection with the following detailed embodiments. These examples are provided to further illustrate various specific and preferred embodiments and techniques. However, it should be understood that many variations and modifications may be made while remaining within the scope of the present invention.

9A-9H are views of various configurations of rotating tools as disclosed herein.

9A is a perspective view of an abrasive rotary tool 820 including a sleeve fixing element 834 securing an abrasive layer 830 comprising tabs to an abrasive assembly holder 822, while FIG. 9B is the abrasive rotary tool of FIG. 9A. Another perspective view of 820. The polishing assembly holder 822 included a shank 824 and a three-dimensional core 826. The shank 824 defined an axis of rotation for the rotating tool 820 and was made of 6061 type aluminum. The three-dimensional core 826 abuts the shank 824 and includes an outer surface 828 and is made of 6061 type aluminum. In the examples of FIGS. 9A and 9B, the three-dimensional core 826 had a bulbous shape. The polishing layer 830 was adjacent to the outer surface 828 and included a contact surface 832. The abrasive layer 830 was die cut from 578XA-TP2 with PSA (available from 3M Company, St. Paul, Minnesota, USA). The tabs of the polishing layer 830 were fixed to the polishing assembly holder 822 by placing the sleeve fixing element 834 over the tabs of the polishing layer 830 and heating to cause its shrinkage. Sleeve fastening element 814 is a P.O. It was heat-shrink tubing purchased from McMaster-Carr in Box 4355.

9C is a perspective view of an abrasive rotary tool 840 including an O-ring fixing element 854 securing an abrasive layer 850 comprising tabs to an abrasive assembly holder 842, while FIG. 9D is the polishing of FIG. 9C. Another perspective view of the rotating tool 840. The polishing assembly holder 842 included a shank 844 and a three-dimensional core 846. The shank 844 defined an axis of rotation for the rotating tool 840 and was made of 6061 type aluminum. The three-dimensional core 846 abuts the shank 844 and includes an outer surface 848 and is made of 6061 type aluminum. In the examples of FIGS. 9C and 9D, the three-dimensional core 846 had a cylindrical shape. The polishing layer 850 was adjacent to the outer surface 848 and included a contact surface 852. Abrasive layer 850 was die cut from 578XA-TP2 with PSA (available from 3M Company, St. Paul, Minnesota, USA). An O-ring fixing element 854 was positioned over the tabs of the polishing layer 850 to secure the tabs of the polishing layer 850 to the polishing assembly holder 842. The O-ring fixing element 854 is a P.O. It was a Buna-N material purchased from McMaster-Carr in Box 4355.

9E is a perspective view of an abrasive rotary tool 860 including an axial fastening element 874 that secures the abrasive layer 870 including tabs to the abrasive assembly holder 862, while FIG. Another perspective view of 860. The polishing assembly holder 862 included a shank 864 and a three-dimensional core 866. The shank 864 defined an axis of rotation for the rotating tool 860 and was made of 6061 type aluminum. The three-dimensional core 866 abuts the shank 864 and includes an outer surface 868 and is made of 6061 type aluminum. In the examples of FIGS. 9E and 9F, the three-dimensional core 866 had a cylindrical shape. The polishing layer 870 was adjacent to the outer surface 868 and included a contact surface 872. The abrasive layer 870 was die cut from 578XA-TP2 with PSA (available from 3M Company, St. Paul, Minnesota, USA). An axial fastening element 874 was positioned over the tabs of the polishing layer 870 to secure the tabs of the polishing layer 870 to the polishing assembly holder 862. The axial fastening element 874 was a conventional threaded-formed screw with a tapered head.

9G is a perspective view of an abrasive rotary tool 880 including two band fixing elements 894A and 894B that secures the wound abrasive layer 890 including tabs to the abrasive assembly holder 882, while FIG. Is another perspective view of the polishing rotary tool 880. The polishing assembly holder 882 included a shank 884 and a three-dimensional core 886. The shank 884 defined an axis of rotation for the rotating tool 880 and was made of 6061 type aluminum. The three-dimensional core 886 abuts the shank 884 and includes an outer surface 888, and is made of 6061 type aluminum. In the examples of FIGS. 9G and 9H, the three-dimensional core 886 had a cylindrical shape. The polishing layer 890 was adjacent to the outer surface 888 and included a contact surface 892. The abrasive layer 890 was die cut from 578XA-TP2 with PSA (available from 3M Company, St. Paul, Minnesota, USA). Each of the band fixing elements 894A and 894B was placed over the strips of the polishing layer 890 and heated to cause its shrinkage to fix the strips of the polishing layer 890 to the polishing assembly holder 882. The band fixing elements 894A and 894B are P.O. It was heat-shrink tubing purchased from McMaster-Carr in Box 4355.

Various embodiments of the present invention have been described. These and other embodiments are within the scope of the following claims.

Claims (33)

As an abrasive rotary tool,
A shank defining the axis of rotation for the rotating tool, and
Three-dimensional core with outer surface adjacent to the shank
Polishing assembly holder comprising a;
An abrasive layer adjacent the outer surface and comprising a contact surface; And
At least one fastening element positioned over a portion of the polishing layer to secure the polishing layer to the polishing assembly holder
Containing, abrasive rotary tool. The abrasive rotary tool of claim 1, wherein the three-dimensional core includes at least one sidewall adjacent the outer surface, and the fixing element secures the polishing layer to at least one sidewall of the three-dimensional core. The abrasive rotary tool of claim 1, wherein at least a portion of the abrasive layer comprises tabs. 4. The abrasive rotary tool of claim 3, wherein the securing element is positioned over at least a portion of the tabs. 5. An abrasive rotary tool according to claim 4, wherein the securing element is located only over at least a portion of the tabs. The polishing rotary tool of claim 1, wherein the polishing layer is fixed to the three-dimensional core without overlapping of the polishing layers. The abrasive rotary tool of claim 1, wherein the contact surface of the abrasive layer comprises a microstructured surface. The abrasive rotary tool of claim 1, wherein the contact surface of the abrasive layer comprises a plurality of precisely shaped abrasive composites. The abrasive rotary tool according to claim 1, wherein at least a portion of the shank and the three-dimensional core are monolithic. The abrasive rotary tool of claim 1, wherein the securing element is at least one of elastomer, plastic, tape, and metal. 11. The abrasive rotary tool of claim 10, wherein the elastomer is at least one of an O-ring, a band, a wrap, a heat shrinkable sleeve, a screw, and a flange. 11. The abrasive rotary tool of claim 10, wherein the plastic is at least one of an O-ring, a band, a wrap, a heat shrinkable sleeve, a screw, and a flange. 11. The abrasive rotary tool of claim 10, wherein the metal is at least one of an O-ring, a band, a wrap, and a flange. The abrasive rotary tool of claim 1, wherein the three-dimensional core comprises at least one of metal, elastomer, and plastic. The abrasive rotary tool of claim 1, wherein the three-dimensional core comprises metal and elastomer or plastic and elastomer. The abrasive rotary tool of claim 1, wherein the three-dimensional core comprises an elastic layer comprising an outer surface. 17. The abrasive rotary tool of claim 16, wherein the three-dimensional core comprises at least one of a plastic layer and a metal layer adjacent the elastic layer. 17. The abrasive rotary tool of claim 16, wherein the elastic layer has a Shore A hardness of less than 80. 17. The abrasive rotary tool of claim 16, wherein the elastic layer comprises at least one of an elastomer, foam, fabric, or nonwoven material. The abrasive rotary tool of claim 1, wherein the three-dimensional core has a Shore A hardness greater than 25. The abrasive rotating tool of claim 1, wherein the three-dimensional core comprises a maximum radial dimension, the shank comprises a maximum radial dimension, and the maximum radial dimension of the core is greater than a maximum radial dimension of the shank. The abrasive rotating tool of claim 1, wherein the three-dimensional core comprises a maximum radial dimension, the shank comprises a maximum radial dimension, and the radial dimension of the core is less than or equal to the radial dimension of the shank. The abrasive rotary tool of claim 1, wherein at least a portion of the core and the shank are metal. The abrasive rotary tool of claim 1 further comprising an adhesive layer disposed between the abrasive layer and the outer surface of the core. 25. The abrasive rotary tool of claim 24, wherein the adhesive layer comprises a pressure sensitive adhesive. The abrasive rotary tool of claim 1, wherein the core comprises a retaining channel. 27. The abrasive rotary tool of claim 26, wherein the securing element is received within at least a portion of the retaining channel. As an assembly,
A computer-controlled machining system including a computer-controlled rotating tool holder and a substrate platform;
A substrate fixed to the substrate platform; And
Grinding rotary tools
Including,
Grinding rotary tools,
A shank defining an axis of rotation for the rotating tool, and
Three-dimensional core with outer surface adjacent to the shank
Polishing assembly holder comprising a;
An abrasive layer adjacent the outer surface and comprising a contact surface; And
At least one fastening element positioned over a portion of the polishing layer to secure the polishing layer to the polishing assembly holder
Containing, assembly. The assembly of claim 28, wherein the substrate is a component for an electronic device. 30. The assembly of claim 29, wherein the component for an electronic device is a transparent display element. As a method for polishing a substrate,
Providing a computer-controlled machining system comprising a computer-controlled rotating tool holder and a substrate platform;
Securing the abrasive rotary tool to a rotary tool holder of a computer-controlled machining system, the abrasive rotary tool comprising:
A shank defining an axis of rotation for the rotating tool, and
Three-dimensional core with outer surface adjacent to the shank
Polishing assembly holder comprising a;
An abrasive layer adjacent the outer surface and comprising a contact surface; And
At least one fastening element positioned over a portion of the polishing layer to secure the polishing layer to the polishing assembly holder
Including -;
Operating a computer-controlled machining system to polish the contact surface of the substrate using the polishing layer of the polishing rotary tool.
Including, the method. As a method for manufacturing an abrasive rotary tool,
Positioning the polishing layer adjacent to the outer surface of the three-dimensional core of the polishing assembly holder-the three-dimensional core is adjacent to the shank of the polishing assembly holder, the polishing layer comprises a contact surface, and the shank defines the axis of rotation of the rotating tool. Ham -; And
Placing at least one fastening element over a portion of the polishing layer to secure the polishing layer to the polishing assembly holder.
Including, the method. 33. The method of claim 32, further comprising applying an adhesive to at least one of the outer surface and the polishing layer prior to positioning the polishing layer.

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