Counter chamfering tool

Abstract

The utility model discloses a kind of reverse chamfer cutters, reverse chamfer cutter includes tool bar and tool head, tool bar includes first rod section and the second rod section connected with first rod section, the diameter of second rod section is greater than the diameter of first rod section;Tool head includes connecting portion and the tool body connected with connecting portion, connecting portion is fixedly connected with the end portion of first rod section away from second rod section, tool body protrudes from first rod section along the radial direction of tool bar, wherein, the length of first rod section is H, diameter is D, H / D≤6.Such, first rod section connects tool head, first rod section can be worn in the through hole of part during working process and collision occurs with the hole wall of through hole, since the ratio H / D of the length and diameter of first rod section≤6, so that the diameter of first rod section is more, beneficial to improve the bending strength of first rod section.

Description

Technical Field

[0001] This utility model relates to the field of cutting tools, and in particular to a reverse chamfering cutting tool. Background Technology

[0002] In some processes of machining holes in parts, it is necessary to chamfer the edges of the holes. During this chamfering process, the cutting tool typically passes through the hole, rotating and moving to complete the chamfering. During this movement, the tool shank may come into contact with or collide with the hole wall. Therefore, improving the strength of the tool shank becomes a technical problem to be solved. Utility Model Content

[0003] This invention provides a reverse chamfering tool to improve the strength of the tool holder.

[0004] The reverse chamfering tool of this application includes a tool shank and a tool head. The tool shank includes a first segment and a second segment connected to the first segment, the diameter of the second segment being larger than the diameter of the first segment. The tool head includes a connecting portion and a tool body connected to the connecting portion. The connecting portion is fixedly connected to the end of the first segment away from the second segment. The tool body protrudes radially from the first segment along the tool shank. The length of the first segment is H, the diameter is D, and H / D ≤ 6.

[0005] In the reverse chamfering tool of this application embodiment, the first rod segment is connected to the cutter head. During the working process, the first rod segment can pass through the through hole of the part and collide with the hole wall. Since the ratio of the length to the diameter of the first rod segment is H / D≤6, the diameter of the first rod segment is larger, and the diameter of the first rod segment is larger, which can improve the section modulus of the first rod segment and is beneficial to improve the bending strength of the first rod segment.

[0006] In some embodiments, the first rod segment is a rod-shaped structure, and the length H of the first rod segment satisfies 4mm≤H≤4.3mm.

[0007] In some embodiments, the first rod segment is a rod-shaped structure, and the diameter of the first rod segment satisfies 0.75mm≤D≤0.8mm.

[0008] In some embodiments, the second rod segment has a frustum-shaped segment with a gradually decreasing diameter in the direction from the second rod segment toward the cutter head.

[0009] In some embodiments, the number of blades is single, the direction in which the blade protrudes from the first rod segment is defined as a first direction, and the connecting portion extends along the first direction away from the sidewall of the blade to the edge of the first rod segment.

[0010] In some embodiments, the connecting portion has two opposing planes along a second direction, the dimension between the two planes being smaller than the diameter of the first rod segment, and the second direction being perpendicular to the first direction.

[0011] In some embodiments, the dimension of the blade body along the first direction is 1mm-1.2mm, and the maximum distance between the blade body and the centerline of the blade shank is 0.60mm-0.7mm.

[0012] In some embodiments, the blade body has an arc-shaped concave surface connected to the connecting portion, and one edge of the arc-shaped concave surface forms the cutting edge of the blade body.

[0013] In some embodiments, the cutting edge is inclined relative to the centerline of the shank, and the angle between the cutting edge and the centerline of the shank is 45°±0.5°.

[0014] In some embodiments, the tool holder further includes a third segment, the second segment connecting the first segment and the third segment, the diameter of the third segment being larger than the diameter of the second segment, the tool holder being an alloy tool holder, and the tool tip being a diamond tool tip.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a three-dimensional structural diagram of the reverse chamfering tool according to an embodiment of the present utility model; Figure 2 This is a plan view of the chamfering tool according to an embodiment of the present utility model; Figure 3 For example Figure 1 An enlarged schematic diagram of part A of the reverse chamfering tool shown; Figure 4 This is a schematic diagram illustrating the application of the reverse chamfering tool according to an embodiment of the present utility model; Figure 5 This is a schematic diagram showing the combination of the cutting head of the chamfering tool and the first rod segment in an embodiment of this utility model.

[0017] Explanation of reference numerals in the attached figures: 100-Reverse chamfering tool, 10-Tool holder, 11-First segment, 12-Second segment, 13-Third segment, 20-Tool head, 21-Connecting part, 211-Plane, 22-Tool body, 221-Curved concave surface, 222-Tool edge, X-First direction, Y-Second direction, 200-Part, 210-Through hole. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0019] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0022] Please see Figures 1-4The reverse chamfering tool 100 of this application includes a tool shank 10 and a tool head 20. The tool shank 10 includes a first segment 11 and a second segment 12 connected to the first segment 11. The diameter of the second segment 12 is larger than the diameter of the first segment 11. The tool head 20 includes a connecting portion 21 and a tool body 22 connected to the connecting portion 21. The connecting portion 21 is fixedly connected to the end of the first segment 11 away from the second segment 12. The tool body 22 protrudes radially from the first segment 11 along the tool shank 10. The length of the first segment 11 is H, the diameter is D, and H / D ≤ 6.

[0023] In the reverse chamfering tool 100 of this application embodiment, the first rod segment 11 is connected to the tool head 20. During the working process, the first rod segment 11 can pass through the through hole 210 of the part 200 and collide with the hole wall of the through hole 210. Since the ratio of the length to the diameter of the first rod segment 11 is H / D≤6, the diameter of the first rod segment 11 is larger, and the diameter of the first rod segment 11 is larger, which can improve the section modulus of the first rod segment 11 and is beneficial to improve the bending strength of the first rod segment 11.

[0024] Specifically, the reverse chamfering tool 100 functions similarly to a cantilever beam during use. It can be understood that the shorter the length of a cantilever beam, the smaller the maximum bending moment; the larger the diameter, the larger the section modulus. The bending stress of a cantilever beam is the ratio of the maximum bending moment to the section modulus. Thus, by setting the ratio of the length to the diameter H / D of the first segment 11 to be less than or equal to 6, the reverse chamfering tool 100 can reduce the bending stress at the first segment 11, thereby improving the bending strength of the first segment 11.

[0025] The tool holder 10 is typically mounted on a machine tool to allow the chamfering tool 100 to rotate and move under the drive of the machine tool, thereby completing the machining of through holes in the part. A first segment 11 connects the tool head 20 and a second segment 12. The diameter of the first segment 11 is smaller than the diameter of the second segment 12, allowing the first segment 11 of the chamfering tool 100 to pass through the through hole 210 of the part 200. The second segment 12 has a larger diameter, which improves the overall strength of the tool holder 10, thereby increasing its lifespan. The length-to-diameter ratio H / D of the first segment 11 is, for example, 2, 3, 4, 5, or 6.

[0026] When the cross-sections of the first segment 11 and the second segment 12 are circular, the diameters of the first segment 11 and the second segment 12 are the diameters of the cross-sections. When the cross-sections of the first segment 11 and the second segment 12 are non-circular, the diameters of the first segment 11 and the second segment 12 are the diameters of the circumcircle of the cross-sections.

[0027] The connecting part 21 of the cutter head 20 is block-shaped. The connecting part 21 is the main part connecting the cutter head 20 and the first rod segment 11. It can increase the connection area between the cutter head 20 and the first rod segment 11 and improve the stability of the cutter head 20. The cutter body 22 is the machining part of the chamfering tool 100. It can cut the edge of the through hole 210 of the part 200 to achieve chamfering.

[0028] Please see Figure 2 In some embodiments, the first segment 11 is a rod-shaped structure, and the length H of the first segment 11 satisfies 4mm ≤ H ≤ 4.3mm. For example, H can be 4mm, 4.1mm, 4.3mm, etc. In this way, the first segment 11 is a cylindrical rod, which simplifies the structure of the first segment 11. In addition, when the length H of the first segment 11 is within the above range, it can meet the processing requirements of the part 200 with a thickness of less than 4.3mm.

[0029] Please see Figure 2 In some embodiments, the first segment 11 is a rod-shaped structure, and the diameter of the first segment 11 satisfies 0.75mm ≤ D ≤ 0.8mm. For example, D can be 0.75mm, 0.76mm, 0.78mm, 0.8mm, etc. Thus, when the diameter of the first segment 11 is within the above range, it can satisfy the machining of holes with a diameter greater than 0.8mm.

[0030] Please see Figure 2 In some embodiments, the second segment 12 has a frustum-shaped segment with a gradually decreasing diameter in the direction from the second segment 12 toward the cutter head 20. This gradual reduction in the lateral dimension of the second segment 12 facilitates a smooth transition and engagement with the first segment 11, reduces stress concentration in the second segment 12, and improves the overall strength of the cutter shank 10.

[0031] Please see Figure 5 In some embodiments, the number of blades 22 is a single one, and the direction in which the blade 22 protrudes from the first rod segment 11 is defined as the first direction X. The connecting portion 21 extends along the first direction X away from the side wall of the blade 22 to the edge of the first rod segment 11.

[0032] Thus, the number of cutter bodies 22 is one, making the structure of the reverse chamfering cutter 100 simpler and the cost lower. In addition, the connecting part 21 extends to the edge of the first rod segment 11, making the area of ​​connection between the connecting part 21 and the end of the first rod segment 11 larger, improving the stability of the connection between the cutter head 20 and the first rod segment 11.

[0033] It is understandable that during the rotation of the chamfering tool 100, the tool body 22 can form a circular motion trajectory, thereby completing the cutting action on the edge of the through hole 210 and forming a chamfer.

[0034] In some embodiments, the connecting portion 21 has two opposing planes 211 along the second direction Y, the dimension between the two planes 211 being smaller than the diameter of the first rod segment 11, and the second direction Y being perpendicular to the first direction X. Thus, the dimension of the connecting portion 21 along the second direction Y does not exceed the diameter of the first rod segment 11, making the cutting head 20 of the chamfering tool 100 smaller along the second direction Y, enabling it to pass through the through hole 210 of the part 200 without interfering with the hole wall of the through hole 210.

[0035] In another example, the through hole 210 of part 200 is an oblong hole. When the chamfering tool 100 is cutting, the first direction X of the tool head 20 is aligned with the length direction of the through hole 210 of part 200, so that the hole wall of the through hole 210 will not be damaged during the cutting process of the chamfering tool 100.

[0036] Please see Figure 4 and Figure 5 In some embodiments, the dimension L1 of the cutter body 20 along the first direction X is 1mm-1.2mm, and the maximum distance L2 between the centerline of the cutter body 20 and the centerline of the cutter shank 10 is 0.60mm-0.7mm. Thus, the dimensions of the cutter body 20 are appropriate, based on the fact that it protrudes from the first shank segment 11 along the first direction.

[0037] Please see Figure 3 and Figure 5 In some embodiments, the blade body 22 has an arc-shaped concave surface 221, which is connected to the connecting portion 21, and one edge of the arc-shaped concave surface 221 forms the cutting edge 222 of the blade body 22.

[0038] Thus, the cutting edge 222 formed by the arc-shaped concave surface 221 is conducive to the contact between the cutting edge 222 and the part 200 during the working process, while the arc-shaped concave surface 221 avoids the part 200, which is conducive to improving the processing quality.

[0039] Specifically, the arc-shaped concave surface 221 is recessed along the second direction Y. The end of the blade 222 can extend to the connecting portion 21. Or, the two edges of the arc-shaped concave surface 221 can intersect at the connecting portion 21.

[0040] Please see Figure 4 In some embodiments, the cutting edge 222 is inclined relative to the centerline of the tool shank 10, and the angle α between the cutting edge 222 and the centerline of the tool shank 10 is 45° ± 0.5°. Thus, the chamfer formed by the cutting edge 222 is approximately 45°, which meets the chamfering requirements of the through hole 210. In this embodiment, the centerline of the tool shank 10 is a dashed line that passes through the center of the tool shank 10 and extends along the length direction of the tool shank 10.

[0041] Please see Figure 1 and Figure 2 In some embodiments, the tool holder 10 further includes a third segment 13, the second segment 12 connecting the first segment 11 and the third segment 13, and the diameter of the third segment 13 being larger than the diameter of the second segment 12.

[0042] Thus, the larger diameter of the third segment 13 improves the overall strength of the chamfering tool 100 and makes it easier to install. Specifically, the first segment 11, the second segment 12, and the third segment 13 of the guide rod can be a single integrated structure.

[0043] In some embodiments, the tool holder 10 is an alloy tool holder 10, and the cutter head 20 is a diamond cutter head 20. This results in higher hardness of the cutter head 20, making it easier to cut the part 200, improving the consistency of the chamfer, and increasing the yield of the part 200. In one example, the tool holder 10 can be made entirely of tungsten steel.

[0044] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0045] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A reverse chamfering tool, characterized in that, include: A tool holder, comprising a first segment and a second segment connected to the first segment, wherein the diameter of the second segment is larger than the diameter of the first segment; and The cutter head includes a connecting part and a cutter body connected to the connecting part. The connecting part is fixedly connected to the end of the first rod segment away from the second rod segment. The cutter body protrudes radially from the first rod segment, wherein the length of the first rod segment is H, the diameter is D, and H / D≤6.

2. The reverse chamfering tool according to claim 1, characterized in that, The first rod segment is a rod-shaped structure, and the length H of the first rod segment satisfies 4mm≤H≤4.3mm.

3. The reverse chamfering tool according to claim 1, characterized in that, The first rod segment is a rod-shaped structure, and the diameter of the first rod segment satisfies 0.75mm≤D≤0.8mm.

4. The reverse chamfering tool according to claim 1, characterized in that, From the direction of the second rod segment toward the cutter head, the second rod segment has a frustum-shaped segment with a gradually decreasing diameter.

5. The reverse chamfering tool according to claim 1, characterized in that, The number of blades is single, and the direction in which the blade protrudes from the first rod segment is defined as the first direction. The connecting portion extends along the first direction away from the side wall of the blade to the edge of the first rod segment.

6. The reverse chamfering tool according to claim 5, characterized in that, The connecting portion has two opposing planes along the second direction, the dimension between the two planes being smaller than the diameter of the first rod segment, and the second direction being perpendicular to the first direction.

7. The reverse chamfering tool according to claim 5, characterized in that, The dimension of the blade body along the first direction is 1mm-1.2mm, and the maximum distance between the blade body and the center line of the blade shank is 0.60mm-0.7mm.

8. The reverse chamfering tool according to claim 1, characterized in that, The blade has an arc-shaped concave surface, which is connected to the connecting part, and one edge of the arc-shaped concave surface forms the cutting edge of the blade.

9. The reverse chamfering tool according to claim 8, characterized in that, The cutting edge is inclined relative to the center line of the shank, and the angle between the cutting edge and the center line of the shank is 45°±0.5°.

10. The reverse chamfering tool according to any one of claims 1-9, characterized in that, The tool holder also includes a third segment, the second segment connects the first segment and the third segment, the diameter of the third segment is larger than the diameter of the second segment, the tool holder is an alloy tool holder, and the tool tip is a diamond tool tip.

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