CN222552272U - Drill bits and CNC machining centers - Google Patents

Abstract

The application relates to a drill bit and a numerical control machining center, wherein the drill bit comprises a cutter handle and a cutter body, the cutter body comprises a cutter head, cutter teeth and cutting edges extending in the same direction with the cutter teeth, the cutter head is coaxially connected to the cutter handle, the cutter teeth are coaxially connected to one side of the cutter head, which is far away from the cutter handle, the cutting edges are arranged on the outer sides of the cutter teeth, the width of the cutting edges is 0.35-0.5 mm, and the height of the cutting edges is 0.75-0.95 mm. The technical scheme of the application effectively solves the technical problems of low machining precision and high machining cost of the hole parts of the traditional drill bit.

Description

Drill bit and numerical control machining center

Technical Field

The application relates to the technical field of machining, in particular to a drill bit and a numerical control machining center.

Background

In the conventional hole processing technology, a solid material is generally processed by a drill to obtain a hole with higher rear roughness, and then a reamer is used for secondary processing of the processed hole to obtain a hole with higher precision and smoother inner wall. The drill bit and the reamer are matched simultaneously to process the holes of the solid materials, so that the processing cost of the hole piece is increased. However, if the conventional drill is used for machining the hole, the obtained hole has high roughness, and the machining precision cannot meet the machining requirement.

Accordingly, there is a need for a drill that reduces machining costs and allows for the formation of holes with sufficient machining accuracy.

Disclosure of utility model

The application provides a drill and a numerical control machining center, which are used for solving the technical problems of low machining precision and high machining cost of a hole part of the traditional drill.

Therefore, in a first aspect, an embodiment of the present application provides a drill, including a shank and a cutter body, where the cutter body includes a cutter head, a cutter tooth and a cutting edge extending in the same direction as the cutter tooth, the cutter head is coaxially connected to the shank, the cutter tooth is coaxially connected to a side of the cutter head away from the shank, the cutting edge is disposed on an outer side of the cutter tooth, a margin width of the cutting edge is 0.35mm to 0.5mm, and a margin height of the cutting edge is 0.75mm to 0.95mm.

In one possible embodiment, a plurality of cutting edges are provided, and the distance between two adjacent cutting edges is 5.2 mm-5.6 mm.

In one possible embodiment, the helix angle of the cutting edge is 26 ° to 34 °.

In one possible implementation, the cutter body is provided with a wear-resistant coating, and the hardness of the wear-resistant coating is 3000-3800 HV.

In one possible embodiment, the wear resistant coating has a thickness of 3 μm to 5 μm.

In one possible embodiment, two cutter teeth are provided, the two cutter teeth are arranged oppositely, a plurality of cutting edges are provided, at least two cutting edges are arranged on each cutter tooth, and a plurality of cutting edges are arranged on the cutter teeth at intervals along the circumferential direction of the drill bit.

In one possible embodiment, the side of the cutter tooth away from the cutter handle is provided with an inclined surface, and the included angle between the two oppositely arranged inclined surfaces is 135-145 degrees.

In one possible implementation, two inner cooling holes are formed in the drill bit, one inner cooling hole is arranged corresponding to each cutter tooth, and the inner cooling holes penetrate through the cutter teeth and the cutter handle.

In one possible embodiment, the tool shank is integrally formed with the tool body.

The application also provides a numerical control machining center which comprises a machine tool, a clamping tool connected to the machine tool, a drill bit and a drill bit, wherein the side, far away from the machine tool, of the clamping tool is provided with a mounting hole, a cutter handle of the drill bit is inserted into the mounting hole, and a cutter body of the drill bit is exposed out of the clamping tool.

According to the drill bit and the numerical control machining center provided by the embodiment of the application, the drill bit comprises the cutter handle and the cutter body, the cutter body comprises the cutter head, the cutter teeth and the cutting edges extending in the same direction with the cutter teeth, the cutter head is coaxially connected to the cutter handle, the cutter teeth are coaxially connected to one side, far away from the cutter handle, of the cutter head, the cutting edges are arranged on the outer sides of the cutter teeth, the width of the cutting edges is 0.35-0.5 mm, and the height of the cutting edges is 0.75-0.95 mm.

According to the technical scheme, the cutting edge is additionally arranged on the cutter tooth, so that the approximately annular chip removing space with the thickness of at least the cutting edge is increased on the outer side of the cutter tooth, the cutting chip removing of the drill bit is facilitated, the machining efficiency of the drill bit is improved, meanwhile, the cutting edge is utilized to cut the surface of the hole wall of the machined hole on the workpiece to be machined, the contact surface is small, the cutting effect is better, the generation of burrs on the workpiece to be machined is facilitated to be reduced, the roughness of the hole wall of the machined hole is reduced, the machining precision is improved, and the machining hole can meet the precision requirement of a hole piece. Compared with the conventional hole piece processing at least requiring the arrangement of a drill bit and a reamer, the drill bit provided by the embodiment of the application at least reduces the arrangement and the working procedures of the reamer in the hole piece processing working procedure, greatly improves the processing efficiency of the hole piece, reduces the processing cost of the hole piece, and improves the processing precision of hole forming of the hole piece.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application. In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort. One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.

Fig. 1 is a schematic perspective view of a drill bit according to an embodiment of the present application;

FIG. 2 is a left side view of FIG. 1;

fig. 3 and fig. 4 are schematic partial structures of cutter teeth of a drill bit according to an embodiment of the present application.

Reference numerals illustrate:

100. a knife handle;

200. The cutter comprises a cutter body, 210, a cutter head, 220, cutter teeth, 221, chip grooves, 222, inclined planes, 230 and cutting edges;

301. an inner cooling hole;

Alpha, front angle, beta, dip angle, gamma, apex angle.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The following disclosure provides many different embodiments, or examples, for implementing different structures of the application. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the applicability of other processes and/or the use of other materials.

For ease of description, spatially relative terms, such as "inner," "outer," "lower," "upper," "above," "front," "rear," and the like, may be used herein to describe one element's or feature's relative positional relationship or movement to another element's or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures experiences a positional reversal or a change in attitude or a change in state of motion, then the indications of these directives will also correspondingly change, e.g., an element described as "under" or "under" another element or feature will then be oriented "over" or "over" the other element or feature. Thus, the example term "below" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein interpreted accordingly.

Referring to fig. 1 to 4, the embodiment of the application provides a drill, which comprises a shank 100 and a cutter body 200, wherein the cutter body 200 comprises a cutter head 210, cutter teeth 220 and a cutting edge 230 extending in the same direction as the cutter teeth 220, the cutter head 210 is coaxially connected with the shank 100, the cutter teeth 220 are coaxially connected with one side of the cutter head 210 far away from the shank 100, the cutting edge 230 is arranged on the outer side of the cutter teeth 220, the width of the cutting edge 230 is 0.35 mm-0.5 mm, and the height of the cutting edge 230 is 0.75 mm-0.95 mm.

In this embodiment, the cutting edge 230 is additionally arranged on the cutter tooth 220, so that a chip removing space with a thickness at least equal to that of the cutting edge 230 is increased on the outer side of the cutter tooth 220, cutting chip removal of a drill bit is facilitated, and machining efficiency of the drill bit is improved. Compared with the conventional hole piece processing at least requiring the arrangement of a drill bit and a reamer, the drill bit provided by the embodiment of the application at least reduces the arrangement and the working procedures of the reamer in the hole piece processing working procedure, greatly improves the processing efficiency of the hole piece, reduces the processing cost of the hole piece, and improves the processing precision of hole forming of the hole piece.

Specifically, the drill is configured to at least include a combination of the shank 100 and the tool body 200, where the shank 100 may be a cylindrical cemented carbide piece, or may be a polygonal cemented carbide piece, and the specific shape thereof may be selected as required, so long as it can be adapted to a mounting hole in the clamping tool. The tool body 200 is configured to at least comprise a combined member of a tool bit 210, a tool tooth 220 and a cutting edge 230, wherein the tool bit 210 can be approximately cylindrical, the axial length of the tool bit is smaller than that of the tool shank 100, the diameter of the tool tooth can be the same as that of the tool shank 100, the tool tooth 220 can be a spiral tooth extending along the axial direction of the tool tooth, a concave chip removing groove 221 is formed on the tool tooth 220, the chip removing groove 221 can accommodate and discharge machining chips, and the cutting edge 230 can be a spiral trimming edge extending along the axial direction of the tool tooth 220 and arranged on the outer side of the tool tooth 220 and used for abutting against and further cutting a machined hole on a workpiece to be machined. And, the specific parameters of the cutting edge 230 are optimized so that the margin height of the cutting edge in the radial direction of the cutter body 200 is 0.75 mm-0.95 mm, and the margin width in the circumferential direction of the cutter body 200 is 0.35 mm-0.5 mm, so that the cutting effect of the cutting edge 230 is ensured, the occupied volume of the cutting edge 230 is reduced, the chip removal space is increased to the greatest extent, the chip removal difficulty is reduced, and the machining precision is improved. For example, but not limited to, the cutting edge 230 has a margin height of 0.85mm and a margin width of 0.4mm.

In one example, the axial length of the tool body 200 is comparable to the axial length of the tool shank 100, e.g., the axial length of the tool body 200 may be 45mm and the axial length of the tool shank 100 may be 48mm. The cutter body 200 may have a diameter of 12mm + -0.002 mm, and the cutter handle 100 may have a diameter of 12mm + -0.011 mm, allowing for a range of machining errors.

In an example, the rake angle α of the cutting edge 230 is configured to be 0 °, while the rake angle β of the cutting edge 230 is configured to be 35 °. Therefore, the waste material is effectively discharged, burrs are reduced, and the machining precision is improved.

In one possible embodiment, a plurality of cutting edges 230 are provided, and the distance between two adjacent cutting edges 230 is 5.2mm to 5.6mm. By the arrangement, the number of times of cutting the machined holes on the workpiece to be machined can be increased in number at least, the roughness of the machined hole wall is reduced, the smoothness of the machined hole wall is improved, and the machining effect and the machining precision are improved. Meanwhile, compared with a single cutting edge 230, the arrangement of a plurality of cutting edges 230 reduces the chip removal space, but increases the contact area between the cutting edge 230 and the machined hole on the workpiece to be machined, which is beneficial to reducing the cutting stress on the single cutting edge 230, reducing the abrasion of the cutting edge 230 and prolonging the service life of the cutter body 200.

In one possible embodiment, the helix angle of the cutting edge 230 is 26 ° to 34 °. By the arrangement, the hole forming accuracy of the cutting edge 230 is high, the consistency is good, the processing stability is good, and the reliability is strong. For example, but not limited to, the helix angle of the cutting edge 230 is 30 °.

In one example, the outer wall of the cutting edge 230 is flush with the outer wall of the shank 100 to increase the strength of the tool body 200, at which point the depth of the hole being drilled by the drill may exceed the axial length of the tool body 200. Of course, in other embodiments, the outer wall of the cutting edge 230 may be also accommodated in the outer wall of the tool holder 100, so as to reduce the material consumption and the cost, and at this time, the hole depth of the hole machined by the drill does not exceed the axial length of the tool body 200.

In one possible embodiment, the cutter body 200 is provided with a wear-resistant coating (not shown), and the hardness of the wear-resistant coating is 3000 hv-3800 hv. By the arrangement, the service life of the cutter body 200 can be prolonged, the wear resistance and rigidity of the cutter body 200 are improved, the roughness of a machining hole wall is reduced, and the machining accuracy is improved. The wear resistant coating may be a HE coating, which may have a hardness of 3500HV. The wear-resistant coating may be disposed on the cutter body 200 by spraying or sprinkling, or may be disposed on the cutter body 200 by electroplating or the like, and is not limited to a specific processing manner of the wear-resistant coating.

In one possible embodiment, the wear resistant coating has a thickness of 3 μm to 5 μm. By the arrangement, the hardness and wear resistance of the cutter body 200 can be further enhanced, the cutting effect of the cutter body 200 is improved, and the service life of the cutter body 200 is prolonged. For example, but not limited to, the thickness of the wear resistant coating may be set to 4 μm.

It is understood that the wear-resistant coating may completely cover portions of the cutting edge 230 and that the wear-resistant coating covers at least a portion of the outside of the cutter teeth 220. That is, the cutting edge 230 may be prepared by a wear-resistant coating, the outer circumferential layer of the cutter tooth 220 may be prepared by a wear-resistant coating, and the inner layer structure of the cutter tooth 220 is machined by cemented carbide. Thus, the hardness of the portion of the cutter body 200 for cutting is enhanced, the cutting roughness is reduced, the cutting smoothness is improved, and the service life of the cutter body 200 is prolonged.

In one possible embodiment, two cutter teeth 220 are provided, two cutter teeth 220 are disposed opposite to each other, a plurality of cutting edges 230 are provided, at least two cutting edges 230 are provided on each cutter tooth 220, and a plurality of cutting edges 230 are disposed on the cutter teeth 220 at intervals along the circumferential direction of the drill.

In this embodiment, a cutter body 200 with a double-tooth structure is provided, at least two cutting edges 230 are disposed on each cutter tooth 220, for example, three cutting edges 230 may be disposed on each grid of the cutter teeth 220, so as to improve smoothness of a cutting wall surface and cutting effect. The novel chip removing device has the advantages that the whole structure is simple and easy to process, the chip removing space is increased, meanwhile, the roughness of a cutting wall surface is reduced, and the cutting accuracy and the cutting effect are improved.

In one possible embodiment, the cutter tooth 220 is provided with an inclined surface 222 on a side away from the cutter handle 100, and an included angle (also referred to as a vertex angle γ) between the two oppositely disposed inclined surfaces 222 is 135 ° to 145 °. By the arrangement, a drilling vertex angle gamma protruding outwards can be formed at the front end of the cutter tooth 220, the drilling vertex angle gamma is an obtuse angle, and the size of the drilling vertex angle gamma is 135-145 degrees, so that drilling processing is facilitated. For example, but not limited to, the borehole apex angle γ is 138 ° or 140 °.

In one possible embodiment, two inner cooling holes 301 are provided on the drill, one inner cooling hole 301 is provided corresponding to one cutter tooth 220, and the inner cooling hole 301 penetrates through the cutter tooth 220 and the cutter handle 100.

In this embodiment, the cutter teeth 220 of the drill bit are provided with inner cooling holes 301 penetrating the drill bit, and the inner cooling holes 301 may be circular holes, square holes or irregular holes, which are used for spraying cutting fluid to a workpiece to be processed in the processing process. Therefore, the cooling and oil removal cleaning of the cutting part of the workpiece to be processed are realized, the smoothness of the processed hole wall is improved, and the cutting effect is improved.

In one possible embodiment, the tool shank 100 is integrally formed with the tool body 200. By the arrangement, the subsequent assembly process is avoided, and the production efficiency of the drill bit is improved. Meanwhile, the consistency of the cutter handle 100 and the cutter body 200 can be ensured, and the processing effect of the drill bit can be improved.

Of course, in other embodiments, since the abrasion of the cutter body 200 is more serious in the use process, the cutter handle 100 and the cutter body 200 of the drill can be separately prepared and then connected together by welding or other modes, so that when the cutter body 200 is damaged/damaged in the subsequent use, only the cutter body 200 can be detached for replacement, and the cutter handle 100 can be continuously used, thereby saving the use cost.

In addition, the application also provides a numerical control machining center which comprises a machine tool, a clamping tool connected to the machine tool, a mounting hole arranged on one side of the clamping tool far away from the machine tool, and the drill bit, wherein the cutter handle 100 of the drill bit is inserted into the mounting hole, and the cutter body 200 of the drill bit is exposed out of the clamping tool.

In this embodiment, the numerical control machining center is configured to at least include a combination member of a machine tool, a clamping tool and a drill bit, where the machine tool may be a MAKINO (MAKINO) a61nx type device, the clamping tool may be a hydraulic tool holder with damping and vibration-proof properties, such as a cobble brand hydraulic tool holder, which may be connected to the machine tool by a fastener such as a bolt/screw, and a mounting hole provided on the tool holder may be a circular hole, and the shank 100 of the drill bit may be inserted into the mounting hole in an interference manner, so as to improve the connection tightness between the drill bit and the clamping tool. In operation, the cutter body 200 of the drill acts on the designated position of the workpiece to be machined according to the G85 reaming cycle instruction of the machine tool, and performs punching machining on the workpiece. The drill cutting process proceeds with feed and withdrawal at the same rotational speed and feed.

In addition, the specific structure of the drill refers to the above embodiments, and because the numerical control machining center adopts all the technical solutions of all the embodiments, the drill has at least all the beneficial effects brought by the technical solutions of the embodiments, and the description is omitted herein.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The utility model provides a drill bit, its characterized in that includes handle of a knife and cutter body, the cutter body include tool bit, cutter tooth and with the cutting edge of cutter tooth syntropy extension, the tool bit with handle of a knife coaxial coupling, cutter tooth coaxial coupling in the tool bit is kept away from one side of handle of a knife, the cutting edge is located the outside of cutter tooth, the margin width of cutting edge is 0.35mm ~0.5mm, the margin height of cutting edge is 0.75mm ~0.95mm.

2. The drill bit according to claim 1, wherein a plurality of cutting edges are provided, and a distance between two adjacent cutting edges is 5.2 mm-5.6 mm.

3. The drill bit of claim 2, wherein the helix angle of the cutting edge is 26 ° to 34 °.

4. The drill bit of claim 1, wherein the cutter body is provided with a wear-resistant coating, and the hardness of the wear-resistant coating is 3000 hv-3800 hv.

5. The drill bit of claim 4, wherein the wear resistant coating has a thickness of 3-5 μm.

6. The drill bit of claim 1, wherein two cutter teeth are provided, the two cutter teeth are arranged opposite to each other, a plurality of cutting edges are provided, at least two cutting edges are provided on each cutter tooth, and a plurality of cutting edges are arranged on the cutter teeth at intervals along the circumferential direction of the drill bit.

7. The drill bit of claim 6, wherein an inclined surface is arranged on one side of the cutter tooth away from the cutter handle, and an included angle between two oppositely arranged inclined surfaces is 135-145 degrees.

8. The drill bit of claim 6, wherein the drill bit is provided with two inner cooling holes, one inner cooling hole is provided corresponding to each cutter tooth, and the inner Leng Kong penetrates through the cutter tooth and the cutter handle.

9. The drill bit of claim 1, wherein the shank is integrally formed with the cutter body.

10. A numerically controlled machining center, comprising:

A machine tool;

A clamping tool connected to the machine tool, a mounting hole arranged on one side of the clamping tool away from the machine tool, and

The drill bit of any one of claims 1 to 9, wherein a shank of the drill bit is inserted into the mounting hole, and a cutter body of the drill bit is exposed from the clamping tool.