Drill bit and numerical control machining center

Abstract

The utility model relates to a drill bit and a numerical control machining center, the drill bit comprises a cutter handle and a cutter body, the cutter body comprises a cutter head, cutter teeth and a cutting edge extending in the same direction as the cutter teeth, the cutter head is coaxially connected to the cutter handle, the cutter teeth are coaxially connected to the side, away from the cutter handle, of the cutter head, the cutting edge is arranged on the outer side of the cutter teeth, the margin width of the cutting edge is 0.35 mm-0. 5mm, and the margin height of the cutting edge is 0.75 mm-0. 95 mm. According to the technical scheme, the technical problems that a traditional drill bit is low in machining precision and high in hole piece machining cost are effectively solved.

Description

Technical Field

[0001] The present application relates to the field of mechanical processing technology, and in particular to a drill bit and a CNC machining center. Background Art

[0002] In traditional hole processing technology, the solid material is usually processed by a drill to obtain a hole with a higher roughness; then, a reamer is used to perform secondary processing on the processed hole to obtain a hole with higher precision and smoother inner wall. The simultaneous cooperation of the drill and reamer to process the solid material increases the processing cost of the hole parts. However, if only the traditional drill is used to process the hole, the obtained hole roughness is high and the processing accuracy cannot meet the processing requirements.

[0003] Therefore, there is an urgent need to find a drill bit that can reduce processing costs and make the hole meet processing accuracy. Utility Model Content

[0004] The present application provides a drill bit and a CNC machining center to solve the technical problems of low machining accuracy of traditional drill bits and high hole processing costs.

[0005] To this end, in the first aspect, an embodiment of the present application provides a drill bit, including a shank and a cutter body, the cutter body including a cutter head, cutter teeth and a cutting edge extending in the same direction as the cutter teeth, the cutter head is coaxially connected to the shank, the cutter teeth are coaxially connected to a side of the cutter head away from the shank, the cutting edge is arranged on the outside of the cutter teeth, the cutting edge band width is 0.35mm~0.5mm, and the cutting edge band height is 0.75mm~0.95mm.

[0006] In a possible implementation manner, a plurality of cutting edges are provided, and a distance between two adjacent cutting edges is 5.2 mm to 5.6 mm.

[0007] In a possible implementation manner, the helix angle of the cutting edge is 26° to 34°.

[0008] In a possible implementation manner, a wear-resistant coating is provided on the cutter body, and the hardness of the wear-resistant coating is 3000HV to 3800HV.

[0009] In a possible implementation manner, the thickness of the wear-resistant coating is 3 μm to 5 μm.

[0010] In a possible implementation, there are two cutter teeth, which are arranged opposite to each other, and there are multiple cutting edges, each of which is provided with at least two cutting edges, and the multiple cutting edges are arranged on the cutter teeth at intervals along the circumference of the drill bit.

[0011] In a possible implementation, an inclined surface is provided on a side of the blade tooth away from the blade handle, and the angle between the two oppositely arranged inclined surfaces is 135° to 145°.

[0012] In a possible implementation, two internal cooling holes are provided on the drill bit, one internal cooling hole is provided corresponding to one cutting tooth, and the internal cooling hole passes through the cutting tooth and the tool handle.

[0013] In a possible implementation, the knife handle and the knife body are integrally formed.

[0014] In the second aspect, the present application also provides a CNC machining center, which includes: a machine tool; a clamping tool connected to the machine tool, and a mounting hole is provided on the side of the clamping tool away from the machine tool; and a drill bit as described above, the drill bit shank is inserted into the mounting hole, and the drill bit body is exposed from the clamping tool.

[0015] According to the drill bit and CNC machining center provided in the embodiments of the present application, the drill bit includes a shank and a cutter body, the cutter body includes a cutter head, cutter teeth and a cutting edge extending in the same direction as the cutter teeth, the cutter head is coaxially connected to the shank, the cutter teeth are coaxially connected to a side of the cutter head away from the shank, the cutting edge is arranged on the outside of the cutter teeth, the width of the cutting edge is 0.35mm~0.5mm, and the height of the cutting edge is 0.75mm~0.95mm.

[0016] The technical solution of the present application adds a cutting edge to the cutter teeth to add an approximately annular chip removal space with a thickness of at least the thickness of the cutting edge on the outer side of the cutter teeth, which facilitates the cutting and chip removal of the drill bit and improves the processing efficiency of the drill bit; at the same time, the cutting edge is used to cut the surface of the processed hole wall on the workpiece to be processed, the contact surface is small, and the cutting effect is better, which is conducive to reducing the generation of burrs on the workpiece to be processed, reducing the roughness of the processed hole wall, and improving the processing accuracy, so that the processed hole meets the accuracy requirements of the hole part. Compared with the traditional hole part processing, which requires at least two tools, a drill bit and a reamer, the drill bit provided in the embodiment of the present application at least reduces the configuration and process of the reamer tool in the hole part processing process, greatly improves the processing efficiency of the hole part, reduces the processing cost of the hole part, and improves the processing accuracy of the hole part. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments that conform to the present application, and are used together with the specification to explain the principles of the present application. In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can also be obtained based on these drawings without paying creative labor. One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplified descriptions do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute a proportional limitation.

[0018] Figure 1 A schematic diagram of the three-dimensional structure of a drill bit provided in an embodiment of the present application;

[0019] Figure 2 for Figure 1 The left side of the figure;

[0020] Figure 3 and Figure 4 A schematic diagram of the partial structure of the teeth of a drill bit provided in an embodiment of the present application.

[0021] Description of reference numerals:

[0022] 100. Knife handle;

[0023] 200, cutter body; 210, cutter head; 220, cutter teeth; 221, chip groove; 222, inclined surface; 230, cutting edge;

[0024] 301, internal cooling hole;

[0025] α, rake angle; β, inclination angle; γ, vertex angle. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0027] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and / or settings discussed in itself. In addition, the various specific processes and examples of materials provided by the present application, but those of ordinary skill in the art can appreciate the applicability of other processes and / or the use of other materials.

[0028] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, 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 descriptors used herein are interpreted accordingly.

[0029] See also Figures 1 to 4 The embodiment of the present application provides a drill bit, including a shank 100 and a cutter body 200, the cutter body 200 includes 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 to the shank 100, the cutter teeth 220 are coaxially connected to a side of the cutter head 210 away from the shank 100, the cutting edge 230 is arranged on the outer side of the cutter teeth 220, the cutting edge 230 has a cutting edge width of 0.35 mm to 0.5 mm, and a cutting edge height of 0.75 mm to 0.95 mm.

[0030] In this embodiment, by adding a cutting edge 230 to the cutter teeth 220, a nearly annular chip removal space with a thickness of at least the thickness of the cutting edge 230 is added to the outside of the cutter teeth 220, which facilitates the cutting and chip removal of the drill bit and improves the processing efficiency of the drill bit; at the same time, the cutting edge 230 is used to achieve secondary cutting of the wall surface of the processed hole on the workpiece to be processed, with a small contact surface and better cutting effect, which is conducive to reducing the generation of burrs on the workpiece to be processed, reducing the roughness of the wall of the processed hole, and improving the processing accuracy, so that the roundness, straightness, diameter and other parameters of the processed hole meet the accuracy requirements of the hole. In addition, compared with the traditional hole processing, which requires at least two tools, a drill bit and a reamer, the drill bit provided in the embodiment of the present application reduces at least the configuration and process of the reamer tool in the hole processing process, greatly improves the processing efficiency of the hole, reduces the processing cost of the hole, and improves the processing accuracy of the hole.

[0031] Specifically, the drill bit is configured as a combined component including at least a shank 100 and a cutter body 200. The shank 100 can be a cylindrical hard alloy part or a multi-prism hard alloy part. Its specific shape can be selected as needed as long as it can be compatible with the mounting hole on the clamping tool. The cutter body 200 is configured as a combined component including at least a cutter head 210, a cutter tooth 220 and a cutting edge 230. The cutter head 210 can be approximately cylindrical, and its axial length is less than the axial length of the shank 100, and its diameter can be the same as the diameter of the shank 100; the cutter tooth 220 can be a spiral tooth extending along its axial direction, and a concave chip groove 221 is provided on the cutter tooth 220, and the chip groove 221 can accommodate and discharge processing debris; the cutting edge 230 can be a spiral polishing edge extending along the axial direction of the cutter tooth 220, which is arranged on the outer side of the cutter tooth 220, and is used to abut and further cut the processed hole on the workpiece to be processed. Furthermore, the specific parameters of the cutting edge 230 are optimized so that the height of the edge band in the radial direction of the cutter body 200 is 0.75 mm to 0.95 mm, and the width of the edge band in the circumferential direction of the cutter body 200 is 0.35 mm to 0.5 mm. In this way, while ensuring the cutting effect of the cutting edge 230, the volume occupied by the cutting edge 230 is reduced, the chip removal space is increased as much as possible, the chip removal difficulty is reduced, and the processing accuracy is improved. For example, but not limited to, the height of the edge band of the cutting edge 230 is 0.85 mm, and the width of the edge band is 0.4 mm.

[0032] In one example, the axial length of the blade body 200 is equivalent to the axial length of the blade handle 100. For example, the axial length of the blade body 200 may be 45 mm, and the axial length of the blade handle 100 may be 48 mm. The diameter of the blade body 200 may be 12 mm ± 0.002 mm, and the diameter of the blade handle 100 may be 12 mm ± 0.011 mm, allowing a certain range of processing errors.

[0033] In one example, the rake angle α of the cutting edge 230 is configured to be 0°, and the inclination angle β of the cutting edge 230 is configured to be 35°. In this way, the effective discharge of waste materials is ensured, the generation of burrs is reduced, and the processing accuracy is improved.

[0034] In a possible embodiment, a plurality of cutting edges 230 are provided, and the spacing between two adjacent cutting edges 230 is 5.2 mm to 5.6 mm. Such a configuration can at least increase the number of cutting times of the processed holes on the workpiece to be processed, reduce the roughness of the processed hole wall, improve the smoothness of the processed hole wall, and improve the processing effect and processing accuracy. At the same time, compared with a single cutting edge 230, although the configuration of multiple cutting edges 230 reduces the chip removal space, it increases the contact area between the cutting edge 230 and the processed hole on the workpiece to be processed, which is conducive to reducing the cutting force on a single cutting edge 230, reducing the wear of the cutting edge 230, and extending the service life of the cutter body 200.

[0035] In a possible implementation, the helix angle of the cutting edge 230 is 26° to 34°. This arrangement can make the hole formed by the cutting edge 230 have high precision, good consistency, good processing stability, and strong reliability. For example, but not limited to, the helix angle of the cutting edge 230 is 30°.

[0036] In one example, the outer wall of the cutting edge 230 is flush with the outer wall of the tool handle 100 to improve the strength of the tool body 200; in this case, the hole depth of the hole processed by the drill bit can exceed the axial length of the tool body 200. Of course, in other embodiments, the outer wall of the cutting edge 230 can also be accommodated in the outer wall of the tool handle 100 to reduce consumables and reduce costs; in this case, the hole depth of the hole processed by the drill bit does not exceed the axial length of the tool body 200.

[0037] In a possible implementation, a wear-resistant coating (not shown) is provided on the cutter body 200, and the hardness of the wear-resistant coating is 3000HV to 3800HV. Such an arrangement can extend the service life of the cutter body 200, improve the wear resistance and rigidity of the cutter body 200, thereby reducing the roughness of the processed hole wall and improving the processing accuracy. The wear-resistant coating can be a HE coating, and its hardness can be 3500HV. The wear-resistant coating can be configured on the cutter body 200 by spraying / spraying, or by electroplating, etc., and the specific processing method of the wear-resistant coating is not limited here.

[0038] In a possible implementation, the thickness of the wear-resistant coating is 3 μm to 5 μm. This configuration can further enhance the hardness and wear resistance of the blade 200, improve the cutting effect of the blade 200, and extend the service life of the blade 200. For example, but not limited to, the thickness of the wear-resistant coating can be set to 4 μm.

[0039] It is understood that the wear-resistant coating can completely cover the cutting edge 230, and the wear-resistant coating at least covers a portion of the outer side of the cutter tooth 220. In other words, the cutting edge 230 can be prepared by the wear-resistant coating, the outer peripheral layer of the cutter tooth 220 can be prepared by the wear-resistant coating, and the inner layer structure of the cutter tooth 220 is processed by cemented carbide. In this way, the hardness of the cutter body 200 used for cutting is enhanced, the cutting roughness is reduced, the cutting smoothness is improved, and the service life of the cutter body 200 is extended.

[0040] In a possible implementation, there are two teeth 220 , which are arranged opposite to each other, and there are multiple cutting edges 230 , each tooth 220 is provided with at least two cutting edges 230 , and the multiple cutting edges 230 are arranged on the tooth 220 at intervals along the circumference of the drill bit.

[0041] In this embodiment, a double-tooth structured cutter body 200 is provided, and each cutter tooth 220 is provided with at least two cutting edges 230, such as three cutting edges 230, to improve the smoothness of the cutting wall surface and improve the cutting effect. The entire structure is simple and easy to process, and while increasing the chip removal space, the roughness of the cutting wall surface is reduced, and the cutting accuracy and cutting effect are improved.

[0042] In a possible embodiment, an inclined surface 222 is provided on the side of the blade tooth 220 away from the blade handle 100, and the angle between the two inclined surfaces 222 arranged opposite to each other (also called the vertex angle γ) is 135° to 145°. With such an arrangement, a drilling vertex angle γ protruding outward can be formed at the front end of the blade tooth 220, and the drilling vertex angle γ is an obtuse angle, and the vertex angle γ is 135° to 145°, so as to facilitate drilling processing. For example but not limited to, the drilling vertex angle γ is 138° or 140°.

[0043] In a possible implementation manner, two inner cooling holes 301 are provided on the drill bit, one inner cooling hole 301 is provided corresponding to one cutting tooth 220 , and the inner cooling hole 301 passes through the cutting tooth 220 and the tool handle 100 .

[0044] In this embodiment, an inner cooling hole 301 penetrating the drill bit is provided on the cutter teeth 220 of the drill bit. The inner cooling hole 301 may be a circular hole, a square hole or an irregular hole, which is used to spray cutting fluid on the workpiece to be processed during the processing. In this way, the cutting part of the workpiece to be processed is cooled and degreased, the smoothness of the processed hole wall is improved, and the cutting effect is improved.

[0045] In a possible implementation, the handle 100 and the cutter body 200 are integrally formed. This configuration avoids the subsequent assembly process and improves the production efficiency of the drill bit. At the same time, the consistency of the handle 100 and the cutter body 200 can be ensured, thereby improving the processing effect of the drill bit.

[0046] Of course, in other embodiments, since the cutter body 200 is more severely worn during use, the drill bit handle 100 and the cutter body 200 may be prepared separately and then connected together by welding or the like. In this way, when the cutter body 200 is damaged / injured during subsequent use, only the cutter body 200 may be disassembled and replaced, and the cutter handle 100 may continue to be used, thereby saving use costs.

[0047] In addition, the present application also provides a CNC machining center, which includes: a machine tool; a clamping tool connected to the machine tool, and a mounting hole is provided on the side of the clamping tool away from the machine tool; and a drill bit as described above, the drill bit shank 100 is inserted into the mounting hole, and the drill bit body 200 is exposed from the clamping tool.

[0048] In this embodiment, the CNC machining center is configured as a combination of at least a machine tool, a clamping fixture and a drill bit. The machine tool may be a MAKINO a61nx type device; the clamping fixture may be a hydraulic tool holder with damping and shockproof performance, such as a hydraulic tool holder of the Cobalt Ridge brand, which may be connected to the machine tool by fasteners such as bolts / screws, and the mounting hole provided thereon may be a circular hole; the drill bit shank 100 may be inserted into the mounting hole by interference fit to improve the connection tightness between the drill bit and the clamping fixture. During operation, the drill bit body 200 acts on the specified position of the workpiece to be processed according to the G85 reaming cycle instruction of the machine tool to perform drilling processing on it. The drill bit cutting process performs feed and retract at the same speed and feed.

[0049] In addition, the specific structure of the drill bit refers to the above embodiments. Since the CNC machining center adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0050] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0051] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0052] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A drill bit, characterized in that: The utility model comprises a tool handle and a tool body, wherein the tool body comprises a tool head, tool teeth and a cutting edge extending in the same direction as the tool teeth, the tool head is coaxially connected to the tool handle, the tool teeth are coaxially connected to a side of the tool head away from the tool handle, the cutting edge is arranged on the outside of the tool teeth, the cutting edge has a blade width of 0.35 mm to 0.5 mm, and a blade height of 0.75 mm to 0.95 mm.

2. The drill bit according to claim 1, characterized in that There are multiple cutting edges, and the distance between two adjacent cutting edges is 5.2 mm to 5.6 mm.

3. The drill bit according to claim 2, characterized in that The helix angle of the cutting edge is 26° to 34°.

4. The drill bit according to claim 1, characterized in that The cutter body is provided with a wear-resistant coating, and the hardness of the wear-resistant coating is 3000HV to 3800HV.

5. The drill bit according to claim 4, characterized in that The thickness of the wear-resistant coating is 3 μm to 5 μm.

6. The drill bit according to claim 1, characterized in that There are two teeth, which are arranged opposite to each other. There are multiple cutting edges, each of which is provided with at least two cutting edges. The multiple cutting edges are arranged on the teeth at intervals along the circumference of the drill bit.

7. The drill bit according to claim 6, characterized in that An inclined surface is provided on the side of the blade tooth away from the blade handle, and the angle between the two inclined surfaces arranged opposite to each other is 135° to 145°.

8. The drill bit according to claim 6, characterized in that The drill bit is provided with two inner cooling holes, one inner cooling hole is provided corresponding to one cutter tooth, and the inner cooling hole passes through the cutter tooth and the cutter handle.

9. The drill bit according to claim 1, characterized in that The knife handle is integrally formed with the knife body.

10. A CNC machining center, characterized in that: include: machine tool; A clamping tool connected to the machine tool, wherein a mounting hole is provided on a side of the clamping tool away from the machine tool; as well as The drill bit according to any one of claims 1 to 9, wherein the shank of the drill bit is inserted into the mounting hole, and the body of the drill bit is exposed from the clamping tooling.

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