CN107538359B - Mixed powder grinding wheel and preparation method thereof - Google Patents

Abstract

The application relates to a powder mixing grinding wheel and a preparation method thereof. The powder mixing grinding wheel comprises a grinding wheel base body and a porous structural member, wherein the porous structural member is assembled on the grinding wheel base body, and the porous structural member is at least one selected from a reticulated structural member, a honeycomb structural member and a mouth frame structural member. The mixed powder grinding wheel can avoid the grinding burn of various materials, realize the control of grinding cracks and prolong the service life of the grinding wheel.

Description

Mixed powder grinding wheel and preparation method thereof

Technical field

The present invention relates to the technical field of metal material grinding processing. Specifically, the present invention relates to a powder-mixed grinding wheel and a preparation method thereof.

Background technique

For traditional continuous grinding powder-mixed grinding wheels, such as ceramic bonded powder-mixed grinding wheels and resin-bonded powder-mixed grinding wheels, the temperature in the grinding arc zone increases exponentially during the grinding process, and it is easy to cause processing problems due to high grinding temperatures. Surface burn phenomenon.

Therefore, mixed powder grinding wheels with better performance and their preparation methods need further research.

Contents of the invention

This application is based on the inventor's discovery and understanding of the following facts and problems:

Continuous grinding of powder-mixed grinding wheels can easily cause burns on the machined surface due to high grinding temperatures. Intermittent grinding of powder-mixed grinding wheels, such as slotted intermittent grinding grinding wheels prepared by hot pressing or brazing/electroplating methods, Powder grinding wheel, because the temperature rise in the grinding arc zone during the grinding process presents a heating-cooling-heating cycle mode, it has a good effect in controlling the temperature rise in the grinding arc zone and can prevent grinding caused by high temperature. Chipping burns and cracks.

However, the bond type of the grooved intermittent grinding powder-mixed grinding wheel prepared by the hot pressing method, such as the dressing method, is mostly limited to ceramic or resin bond. The depth of the trimmed groove is small, and after the abrasive grains of the dressing layer are worn, it needs to be Repeated dressing; the abrasive particle size of the mixed powder grinding wheel prepared by the brazing method is generally larger, basically above 100 microns. It is extremely difficult to achieve the brazing process with abrasive particles below this particle size, and the brazed abrasive particles are single-layer abrasive particles. , after the abrasive grains wear, the mixed powder grinding wheel will lose its grinding performance; the electroplated powder mixed grinding wheel prepared by the electroplating method still has a single layer of abrasive grains, and after the abrasive grains wear, the mixed powder grinding wheel will also lose its grinding performance.

Based on the above problems, the inventor combined the advantages of laser selective melting forming, that is, the additive manufacturing method, to prepare a mixed powder grinding wheel for metal bonding agents and superhard abrasives, and contains a designable structure, definable size porous features and a multi-layer grinding wheel. grain, combining the multi-layered abrasive grains of hot-pressed mixed powder grinding wheels with the advantages of intermittent grinding of brazed/electroplated mixed powder grinding wheels. The inventor was surprised to find that the powder-mixed grinding wheel prepared by the method claimed in this application can avoid burns in the grinding process of many types of materials, achieve grinding crack control and extend the service life of the grinding wheel.

The present invention aims to solve one of the technical problems in the related art, at least to a certain extent.

In a first aspect of the present invention, the present invention proposes a powder-mixed grinding wheel. According to an embodiment of the invention, the powder-mixed grinding wheel includes: a grinding wheel base and a porous structural member. The porous structural member is assembled on the grinding wheel base. on the porous structural member, and the porous structural member is selected from at least one of a mesh structural member, a honeycomb structural member and a mouth frame structural member. The powder-mixed grinding wheel according to the embodiment of the present invention can significantly enhance the cooling effect of the grinding processing area, causing the grinding temperature to rise in a "sawtooth" manner, thus avoiding the exponential rapid growth of the grinding temperature in traditional grinding processing. It can effectively prevent the occurrence of grinding burns and grinding cracks.

According to embodiments of the present invention, the above-mentioned mixed powder grinding wheel may further include at least one of the following additional technical features:

According to the embodiment of the present invention, the depth of the grooves in the textured structural member is 0.2mm~2mm, the width of the grooves is 0.2mm~2mm, the spacing between parallel textures on the circumferential expansion surface of the grinding wheel is 2mm~5mm, and the cross mesh The angle formed by the pattern is 30~90 degrees. The inventor found that within the above size range, the grinding efficiency of the grinding wheel can be significantly improved without significantly increasing the surface roughness of the grinding workpiece.

According to an embodiment of the present invention, the honeycomb structural member includes a plurality of honeycomb holes, the inscribed circle diameters of the plurality of honeycomb holes are independently 0.5~2mm, and the center distance between adjacent honeycomb holes is 1.74~1.76mm. , the depths of the plurality of honeycomb holes are independently 2 to 2.5 mm, and the distance between the honeycomb holes close to the upper edge of the powder mixing grinding wheel and the upper edge of the powder mixing grinding wheel is 0.32 to 0.35 mm. The distance between the honeycomb holes at the lower edge of the powder grinding wheel and the lower edge of the mixed powder grinding wheel is 0.32 to 0.35 mm. The inventor found that within the above size range, the cooling effect of the grinding processing area can be significantly enhanced, while ensuring high grinding efficiency and long service life of the grinding wheel. Among them, "respectively and independently" means that the size of each honeycomb hole is not limited by other holes, specifically including the three situations in which the sizes of the plurality of honeycomb holes are all equal, not equal, or not completely equal.

According to an embodiment of the present invention, the mouth frame structural member includes a plurality of mouth frames, the circumscribed circle diameters of the plurality of mouth frames are independently 0.3~3 mm, and the distance between the centers of the circumscribed circles of adjacent mouth frames is 0.2~2mm, and the depths of the multiple mouth frames are independently 2~2.5mm. The inventor found that within the above size range, the cooling effect of the grinding processing area can be significantly enhanced, while ensuring high grinding efficiency and long service life of the grinding wheel. Among them, "respectively and independently" means that the size of each mouth frame is not limited by other mouth frames, specifically including the three situations in which the sizes of the plurality of mouth frames are all equal, not equal, or not completely equal.

According to an embodiment of the present invention, the dimensional accuracy of the mesh structural member, the honeycomb structural member and the mouth frame structural member are independently not less than 0.1 mm. High precision is more conducive to ensuring that the mixed powder grinding wheel of the present invention functions, so as to solve the problems of grinding burns, grinding crack control, and low service life of the grinding wheel.

In the second aspect of the present invention, the present invention proposes a method for preparing the above-mentioned mixed powder grinding wheel. According to an embodiment of the present invention, the method includes: (1) mixing the metal bond agent and the abrasive and then performing ball milling treatment; In order to obtain the mixed powder; (2) The mixed powder is subjected to laser selective melting and forming processing to obtain the mixed powder grinding wheel. According to the embodiment of the present invention, this method breaks through the conventional idea of preparing slotted intermittent grinding mixed powder grinding wheels using the traditional manufacturing process of hot pressing method or brazing/electroplating method. Through laser selective melting forming technology, according to the three-dimensional digital model of the part, , using metal powder without any fixtures and molds, thus directly obtaining powder-mixed grinding wheels of any complex shape. The mixed powder grinding wheel with porous structure characteristics prepared by this method can significantly enhance the cooling effect of the grinding processing area, causing the grinding temperature to rise in a "sawtooth" manner, thereby avoiding the exponential grinding temperature in traditional grinding processing. The rapid growth can effectively prevent the occurrence of grinding burns and grinding cracks.

According to embodiments of the present invention, the above method may further include at least one of the following additional technical features:

According to an embodiment of the present invention, the metal binder is selected from at least one of iron-based metal powder, copper-based metal powder and nickel-based metal powder. The inventor found that the metal bond has higher bonding strength, grinding efficiency, durability, no clogging, and better wear resistance, thereby ensuring excellent molding quality and long service life of the grinding wheel.

According to a specific embodiment of the present invention, the powder sphericity of the metal binder is not less than 90%. The inventor found that when the sphericity is less than the above-mentioned sphericity, the powder has poor fluidity and is prone to agglomeration during the powder spreading process, thereby affecting the molding quality of the grinding wheel, resulting in reduced grinding efficiency and shortened service life of the grinding wheel.

According to specific embodiments of the present invention, the particle size of the metal binder is 38 to 45 microns. The inventor found that the bonding strength, grinding efficiency and durability of the metal bond within the particle size range are further improved, the wear resistance is better, and the service life is longer.

According to a specific embodiment of the present invention, the oxygen content in the metal bonding agent is no more than 600 ppm. The inventor found that when the oxygen content is greater than the above range, local oxidation is likely to occur during the laser sintering process, resulting in poor molding quality of the grinding wheel, resulting in reduced grinding efficiency and shortened service life of the grinding wheel.

According to an embodiment of the invention, the abrasive is diamond abrasive. The inventor found that diamond abrasives have high hardness, high compressive strength, and good wear resistance, thereby ensuring excellent grinding wheel molding quality, high grinding efficiency, and long service life.

According to an embodiment of the present invention, the abrasive is cubic boron nitride abrasive. The inventor found that cubic boron nitride abrasives have high hardness, high temperature resistance, good stability under high temperatures, and do not react with iron, thereby ensuring excellent grinding wheel molding quality, high grinding efficiency, and long service life.

According to a specific embodiment of the present invention, the abrasive grain size of the abrasive is 38 microns to 100 microns.

According to a specific embodiment of the present invention, the abrasive particle concentration of the abrasive is 50% to 150%.

According to a specific embodiment of the present invention, the abrasive grains of the abrasive have a coating, the coating is at least one selected from the group consisting of nickel and titanium, and the thickness of the coating is no more than 5 microns. The inventor found that the coating can improve the bonding strength between the abrasive grains and the bonding agent, slow down the wear of the abrasive grains and extend the service life of the grinding wheel without affecting the grinding effect.

According to an embodiment of the present invention, in step (1), the uniformity of the mixed powder is not less than 95%. The inventor found that the uniformity can ensure the uniformity of powder mixing. When the powder mixing is lower than the uniformity, the high temperature resistance of the prepared powder mixing grinding wheel is significantly reduced and the service life is shortened.

According to a specific embodiment of the present invention, in step (1), during the selective laser melting and forming process, the laser power is 50-200W, the scanning speed is 400-1200mm/s, the powder coating thickness is 20-100 microns, and the overlap rate It is 20%~50%. The inventor found that the mixed powder grinding wheel with porous structure characteristics prepared under the above conditions can effectively avoid the exponential rapid growth of grinding temperature in traditional grinding processes, thereby preventing the occurrence of grinding burns and grinding cracks. .

According to a specific embodiment of the present invention, it further includes: (3) dressing and ultrasonic cleaning of the powder mixing grinding wheel. The inventor found that a powder-mixing grinding wheel with better performance can be obtained after dressing and cleaning.

Description of the drawings

Figure 1 is a schematic diagram of the external dimensions of a powder-mixing grinding wheel with porous structure characteristics according to an embodiment of the present invention;

Figure 2 is a schematic diagram of the porous structure characteristics of a mixed powder grinding wheel according to an embodiment of the present invention.

Among them, (a) is a mesh type porous structure, (b) is a honeycomb type porous structure, and (c) is a frame type porous structure;

Figure 3 is a schematic structural dimension diagram of the porous structural features of a mixed powder grinding wheel according to an embodiment of the present invention.

Among them, (a) is the main view, (b) is the top view, and (c) is the three-dimensional view;

Figure 4 is a schematic structural dimension diagram of the honeycomb type porous structure characteristics of a mixed powder grinding wheel according to an embodiment of the present invention.

Among them, (a) is the main view, (b) is the cross-sectional view along the A-A direction, (c) is the top view, (d) is the partial enlarged view of the area circled in (a), the enlargement ratio is 40:1; and

Figure 5 is a schematic structural dimension diagram of the porous structural features of a powder-mixed grinding wheel frame type according to an embodiment of the present invention.

Among them, (a) is the main view, (b) is the cross-sectional view along the B-B direction, (c) is the top view, and (d) is the partial enlarged view of the area I circled in (a).

Reference signs:

1: Grinding wheel base

2: Porous structural parts

θ ₁ : The angle formed by the cross pattern

D ₁ : spacing between parallel meshes

W ₁ : slot width

H ₁ : Grooving depth

D ₂ : The distance between the honeycomb holes near the upper edge of the powder mixing grinding wheel and the upper edge of the powder mixing grinding wheel

D ₃ : The distance between the honeycomb holes near the lower edge of the powder-mixing grinding wheel and the lower edge of the powder-mixing grinding wheel

H ₂ : honeycomb hole depth

D ₄ : Center distance between adjacent honeycomb holes

Φ ₁ : The diameter of the inscribed circle of the honeycomb hole

H ₃ : Mouth frame depth

Φ ₂ : diameter of the circumscribed circle of the mouth frame

D ₅ : distance between the centers of circumscribed circles of adjacent mouth frames

Detailed ways

Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and are not to be construed as limiting the present invention.

Among them, the structural dimensions of the mesh type porous structure characteristics of the mixed powder grinding wheel include the groove depth, the groove width, the spacing between the parallel meshes on the circumferential expansion surface of the grinding wheel, and the angle formed by the cross meshes.

Honeycomb type porous structure characteristics The structural dimensions of the powder-mixing grinding wheel include the diameter of the inscribed circle of the honeycomb holes, the center distance between adjacent honeycomb holes, the distance between the honeycomb holes and the edge of the powder-mixing grinding wheel, and the depth of the honeycomb holes.

Mouth frame type porous structure characteristics The structural dimensions of the powder mixing grinding wheel include the diameter of the circumscribed circle of the mouth frame, the distance between the centers of the circumscribed circles of adjacent mouth frames and the depth of the mouth frame.

Mixed powder grinding wheel

In the first aspect of the present invention, the present invention proposes a powder-mixed grinding wheel. Referring to Figure 1, according to an embodiment of the invention, the powder-mixed grinding wheel includes: a grinding wheel base 1 and a porous structural member 2. The porous structural member is assembled on the grinding wheel base, and the porous structural member is at least one selected from the group consisting of reticulated structural members, honeycomb structural members and mouth frame structural members. The porous structural member according to the embodiment of the present invention is a grinding part used for grinding. The powder-mixed grinding wheel according to the embodiment of the present invention can significantly enhance the cooling effect of the grinding processing area, causing the grinding temperature to rise in a "sawtooth" manner, thus avoiding the exponential rapid growth of the grinding temperature in traditional grinding processing. It can effectively prevent the occurrence of grinding burns and grinding cracks.

According to a specific embodiment of the present invention, with reference to Figures 2 and 3, the groove depth _H1 in the reticulated structural member is 0.2mm~2mm, the groove width _W1 is 0.2mm~2mm, and the circumferential expansion surface of the grinding wheel is parallel to the reticulated pattern. The distance D ₁ between them is 2mm~5mm, and the angle θ ₁ formed by the cross pattern is 30~90 degrees. The inventor found that within this size range, the grinding efficiency of the grinding wheel can be significantly improved without significantly increasing the surface roughness of the grinding workpiece.

According to yet another specific embodiment of the present invention, with reference to Figures 2 and 4, the honeycomb structural member includes a plurality of honeycomb holes, the inscribed circle diameters _Φ1 of the plurality of honeycomb holes are independently 0.5~2mm, and adjacent The honeycomb hole center distance D ₄ is 1.74 to 1.76 mm, the plurality of honeycomb hole depths H ₂ are independently 2 to 2.5 mm, and the honeycomb holes close to the upper edge of the powder mixing grinding wheel are in contact with the mixing wheel. The distance D ₂ between the upper edges of the powder grinding wheel is 0.32 to 0.35 mm, and the distance D ₃ between the honeycomb holes close to the lower edge of the powder mixing grinding wheel and the lower edge of the powder mixing grinding wheel is 0.32 to 0.35 mm. The inventor found that within this size range, the cooling effect of the grinding processing area can be significantly enhanced, while ensuring high grinding efficiency and long service life of the grinding wheel. Among them, "respectively and independently" means that the size of each honeycomb hole is not limited by other holes, specifically including the three situations in which the sizes of the plurality of honeycomb holes are all equal, not equal, or not completely equal.

According to yet another specific embodiment of the present invention, with reference to Figures 2 and 5, the mouth frame structure includes a plurality of mouth frames, the circumscribed circle diameters Φ ₂ of the plurality of mouth frames are independently 0.3~3mm, and adjacent The distance D ₅ between the centers of the circumscribed circles of the mouth frames is 0.2 to 2 mm, and the depths H ₃ of the plurality of mouth frames are independently 2 to 2.5 mm. The inventor found that within this size range, the cooling effect of the grinding processing area can be significantly enhanced, while ensuring high grinding efficiency and long service life of the grinding wheel. Among them, "respectively and independently" means that the size of each mouth frame is not limited by other mouth frames, specifically including the three situations in which the sizes of the plurality of mouth frames are all equal, not equal, or not completely equal.

According to yet another specific embodiment of the present invention, the dimensional accuracy of the mesh structural member, the honeycomb structural member and the mouth frame structural member are independently not less than 0.1 mm. High precision is more conducive to ensuring that the mixed powder grinding wheel of the present invention functions, so as to solve the problems of grinding burns, grinding crack control, and low service life of the grinding wheel.

Methods for Preparing Mixed Powder Grinding Wheels

In a second aspect of the present invention, the present invention proposes a method for preparing the above-mentioned mixed powder grinding wheel. According to an embodiment of the present invention, the method includes: (1) Mixing a metal bond agent and abrasives and then performing ball milling treatment, so that A mixed powder is obtained; (2) The mixed powder is subjected to laser selective melting and forming processing to obtain the mixed powder grinding wheel. According to the embodiment of the present invention, this method breaks through the conventional idea of preparing slotted intermittent grinding mixed powder grinding wheels using the traditional manufacturing process of hot pressing method or brazing/electroplating method. Through laser selective melting forming technology, according to the three-dimensional digital model of the part, , using metal powder without any fixtures and molds, thus directly obtaining powder-mixed grinding wheels of any complex shape. The mixed powder grinding wheel with porous structure characteristics prepared by this method can significantly enhance the cooling effect of the grinding processing area, causing the grinding temperature to rise in a "sawtooth" manner, thereby avoiding the exponential grinding temperature in traditional grinding processing. The rapid growth can effectively prevent the occurrence of grinding burns and grinding cracks.

According to a specific embodiment of the present invention, the metal binder is selected from at least one of iron-based metal powder, copper-based metal powder and nickel-based metal powder. The inventor found that this type of metal bond has higher bonding strength, grinding efficiency, durability, no clogging, and better wear resistance, thus ensuring excellent molding quality and long service life of the grinding wheel.

According to a specific embodiment of the present invention, the powder sphericity of the metal binder is not less than 90%. The inventor found that when the sphericity is less than this, the powder has poor fluidity and is prone to agglomeration during the powder spreading process, thereby affecting the molding quality of the grinding wheel, resulting in reduced grinding efficiency and shortened service life of the grinding wheel.

According to specific embodiments of the present invention, the particle size of the metal binder is 38 to 45 microns. The inventor found that the metal bond within this particle size range has further improved bonding strength, grinding efficiency and durability, better wear resistance and longer service life.

According to a specific embodiment of the present invention, the oxygen content in the metal bonding agent is no more than 600 ppm. The inventor found that when the oxygen content is greater than this range, local oxidation is likely to occur during the laser sintering process, resulting in poor molding quality of the grinding wheel, resulting in reduced grinding efficiency and shortened service life of the grinding wheel.

According to an embodiment of the invention, the abrasive is diamond abrasive. The inventor found that diamond abrasives have high hardness, high compressive strength, and good wear resistance, thereby ensuring excellent grinding wheel molding quality, high grinding efficiency, and long service life.

According to an embodiment of the present invention, the abrasive is cubic boron nitride abrasive. The inventor found that the cubic boron nitride abrasive has high hardness, high temperature resistance, good stability at high temperatures, and does not react with iron, thereby ensuring excellent grinding wheel molding quality, high grinding efficiency, and long service life.

According to a specific embodiment of the present invention, the abrasive grain size of the abrasive is 38 microns to 100 microns.

According to specific embodiments of the present invention, the abrasive grain concentration of the abrasive is 50% to 150%.

According to a specific embodiment of the present invention, the abrasive grains of the abrasive have a coating, the coating is at least one selected from the group consisting of nickel and titanium, and the thickness of the coating is no more than 5 microns. The inventor found that the coating can improve the bonding strength between the abrasive grains and the bonding agent, slow down the wear of the abrasive grains and extend the service life of the grinding wheel without affecting the grinding effect.

According to a specific embodiment of the present invention, in step (1), the uniformity of the mixed powder is not less than 95%. The inventor found that this uniformity can ensure the uniformity of powder mixing. When the powder mixing is lower than this uniformity, the high temperature resistance of the prepared powder mixing grinding wheel is significantly reduced and the service life is shortened.

According to a specific embodiment of the present invention, in step (1), the laser power during the selective laser melting and forming process is 50-200W, the scanning speed is 400-1200mm/s, the powder coating thickness is 20-100 microns, and the overlap rate 20%～50%. The inventor found that the powder-mixed grinding wheel with porous structure characteristics prepared under these conditions can effectively avoid the exponential rapid increase in grinding temperature in traditional grinding processes, thereby preventing the occurrence of grinding burns and grinding cracks.

According to a specific embodiment of the present invention, the method further includes: step (3) dressing and ultrasonic cleaning of the powder mixing grinding wheel. The inventor found that a powder-mixing grinding wheel with better performance can be obtained after dressing and cleaning.

According to specific embodiments of the present invention, the structural design and additive manufacturing of the above-mentioned mixed powder grinding wheel with porous structural characteristics are carried out in sequence according to the following steps:

Step 1: Design the outer dimensions of the base structure of the mixed powder grinding wheel. According to the technical requirements of the grinding object and the installation size requirements of the grinding wheel shaft of the grinding machine tool, design the outer diameter, inner hole diameter, width or height of the mixing grinding wheel base structure.

Step 2: Design the type, structural size and accuracy of the porous structure characteristics of the mixed powder grinding wheel. Design the type of porous structural features of the powder-mixing grinding wheel, and design the structural dimensions and accuracy requirements of the porous structural features.

The second step specifically includes the following two steps:

Step A: According to the technical requirements of the grinding object, design the porous structure feature types of the mixed powder grinding wheel. These types include texture type, honeycomb type and mouth frame type.

Step B: According to the grinding performance requirements and the technical index requirements of the forming accuracy, design the structural size and accuracy of each hole in the porous structural features. For the characteristics of the porous structure of the reticulated type, refer to Figure 3. The groove depth is 0.2mm~2.5mm, the groove width is 0.2mm~2mm, the reticulate spacing is 2mm~5mm, and the acute angle formed by the cross reticles is 30 degrees~ between 90 degrees. Regarding the characteristics of the honeycomb type porous structure, refer to Figure 4. The diameter of the inscribed circle of the honeycomb holes is 1mm, the spacing between the honeycomb holes is 1.74~1.76mm, and the distance between the honeycomb holes and the edge of the powder mixing grinding wheel is 0.32~0.35mm. The depth is 2~2.5mm. Regarding the porous structure characteristics of the mouth frame type, refer to Figure 5. The diameter of the circumscribed circle of the mouth frame is 0.3~3mm, the distance between the mouth frames is 0.2~2mm, and the depth of the mouth frame is 2~2.5mm. The dimensional accuracy of each hole is required to be no less than 0.1mm.

Step 3: Select the type of metal bond and superabrasive, and mix the metal bond and superabrasive evenly.

The third step specifically includes the following five steps:

Step A: Select metal materials with higher strength and hardness for the metal bond type of the powder-mixed grinding wheel, including iron-based metal materials, copper-based metal materials or nickel-based metal materials. The powder sphericity of metal materials is not less than 90%, the particle size range is 38-45 microns, and the oxygen content is not more than 600ppm.

Step B: Select cubic boron nitride as the superabrasive type of the powder-mixed grinding wheel. The abrasive grains of the superabrasive should have excellent equal-area crystals with complete crystal forms and sharp edges. The particle size range of the abrasive grains is 38 microns ~ 100 microns.

Step C: The abrasive grains of superhard abrasives can be uncoated or coated. When coated, the type of coating can be nickel plating or titanium plating. The thickness of the coating is generally required to be no more than 5 microns.

Step D: The concentration range of the abrasive grains in the mixed grinding wheel is 50% to 150%. According to the concentration setting value of the abrasive grains, weigh the metal bond and superabrasives respectively.

Step E: Pour the weighed metal bond and superabrasive into the ball mill and mix the powder. The mixing process parameters are such that the uniformity is not less than 95% to ensure the uniformity of the powder mixing.

Step 4: Laser selective melting and forming to prepare a powder-mixed grinding wheel, followed by stress relief treatment. Using the additive manufacturing method, that is, laser selective melting forming technology, the mixed powder grinding wheel is printed and prepared, and the subsequent processing of stress relief is performed.

The fourth step specifically includes the following two steps:

Step A: For the metal bond and superabrasive after powder mixing, set the laser selective melting forming process parameters under the powder mixing conditions. The specific process parameters include laser power of 50~200W, scanning speed of 400~1200mm/s, and paving. The powder thickness is 20 to 100 microns, and the overlap rate is 20% to 50%, so that the additive manufacturing method is used to prepare a mixed powder grinding wheel.

Step B: According to the width or height design requirements of the base structure of the mixed powder grinding wheel, perform line cutting on the mixed powder grinding wheel on the laser selective melting forming substrate, and perform stress relief treatment on the mixed powder grinding wheel after line cutting.

Step 5: Dress the working surface of the mixed powder grinding wheel. Use dressing tools such as the dressing wheel on the grinding machine tool to modify the working surface of the mixed powder grinding wheel into a profile and sharpness that meets the grinding performance requirements.

Step six, ultrasonic cleaning and inspection.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axis", The orientations or positional relationships indicated by "radial direction", "circumferential direction", etc. are based on the orientations or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply the referred devices or components. Must have a specific orientation, be constructed and operate in a specific orientation and are therefore not to be construed as limitations of the invention.

In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically limited.

In the present invention, unless otherwise clearly stated and limited, the terms "installation", "connection", "connection", "fixing" and other terms should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. , or integrated; it can be mechanically connected, electrically connected or communicable with each other; it can be directly connected or indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction between two elements, Unless otherwise expressly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In the present invention, unless otherwise expressly stated and limited, a first feature being "on" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. touch. Furthermore, the terms "above", "above" and "above" the first feature is above the second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "below" and "beneath" the first feature to the second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature has a smaller horizontal height than the second feature.

In the description of this specification, reference to the terms "one embodiment," "some embodiments," "an example," "specific examples," or "some examples" or the like means that specific features are described in connection with the embodiment or example. , structures, materials or features are included in at least one embodiment or example of the invention. In this specification, the schematic expressions of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification unless they are inconsistent with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above-mentioned embodiments are illustrative and should not be construed as limitations of the present invention. Those of ordinary skill in the art can make modifications to the above-mentioned embodiments within the scope of the present invention. The embodiments are subject to changes, modifications, substitutions and variations.

Claims (1)

1. A powder mixing grinding wheel, comprising:

a grinding wheel base;

the porous structural member is assembled on the grinding wheel matrix and is one selected from a reticulated structural member, a honeycomb structural member and a mouth frame structural member;

the grooving depth in the reticulate pattern structural member is 0.2 mm-2 mm, the grooving width is 0.2 mm-2 mm, the distance between parallel reticulate patterns on the circumferential expanding surface of the grinding wheel is 2 mm-5 mm, and the included angle formed by the crossed reticulate patterns is 30-90 degrees;

the honeycomb structural part comprises a plurality of honeycomb holes, the inscribed circle diameters of the plurality of honeycomb holes are respectively and independently 0.5-2 mm, the center distance between every two adjacent honeycomb holes is 1.74-1.76 mm, the depths of the plurality of honeycomb holes are respectively and independently 2-2.5 mm, the distance between the honeycomb holes close to the upper edge of the powder mixing grinding wheel and the upper edge of the powder mixing grinding wheel is 0.32-0.35 mm, and the distance between the honeycomb holes close to the lower edge of the powder mixing wheel and the lower edge of the powder mixing wheel is 0.32-0.35 mm;

the mouth frame structural member comprises a plurality of mouth frames, the diameters of the circumscribing circles of the mouth frames are respectively and independently 0.3-3 mm, the circle center distances of the circumscribing circles of the adjacent mouth frames are respectively and independently 0.2-2 mm, and the depths of the mouth frames are respectively and independently 2-2.5 mm;

the dimensional accuracy of the reticulate pattern structural member, the honeycomb structural member and the mouth frame structural member is respectively and independently not smaller than 0.1mm.