A hot melt drill bit

Abstract

This application discloses a thermoplastic drill bit, relating to the field of drill bit technology, comprising: a shank, a guide extrusion section, and a drill tip extrusion section; one end of the guide extrusion section is connected to the shank, and the diameter of the guide extrusion section is D; the drill tip extrusion section is conical, including a first working section and a second working section, the first working section being connected to the small end of the second working section, and the large end of the second working section being connected to the other end of the guide extrusion section; the first working section is hemispherical, and the surface of the second working section includes spaced-apart first arc-shaped extrusion sections and planar clearance sections; the cross-sectional profile of the second working section is formed by spaced-apart arc-shaped segments formed by the first arc-shaped extrusion sections and straight segments formed by the planar clearance sections, and a first height difference exists between the first arc-shaped segments and the straight segments. This application can improve the machining performance of the drill bit and enhance the surface finish of the machined hole wall.

Description

Technical Field

[0001] This application relates to the field of drill bit technology, and in particular to a thermoplastic drill bit. Background Technology

[0002] In machining, thermoforming drills are used to solve the problem of joining thin-walled workpieces. The drill bit, rotating at high speed, contacts and rubs against the metal surface, generating temperatures of 600 to 800 degrees Celsius, which softens the metal and increases its ductility. Simultaneously, the drill bit presses down during rotation, causing the softened metal to extend along the circular hole, forming a thicker layer three times the original thickness, capable of withstanding greater torque and tensile force. With the continuous development and upgrading of materials in the 3C industry, from aluminum alloys and stainless steel to titanium alloys, conventional thermoforming drills with ordinary circular cross-sections are prone to tool breakage and low processing efficiency when machining titanium alloys due to the work hardening and bonding issues inherent in titanium. Summary of the Invention

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a thermoplastic drill bit that can improve the machining performance of the drill bit and enhance the surface finish of the hole wall after machining.

[0004] In a first aspect, this application provides a thermoplastic drill bit, comprising:

[0005] Handle;

[0006] A guide extrusion section, one end of which is connected to the handle, and the diameter of the guide extrusion section is D;

[0007] The drill tip extrusion section is conical and includes a first working section and a second working section. The small end of the first working section is connected to the small end of the second working section, and the large end of the second working section is connected to the other end of the guide extrusion section. The first working section is hemispherical. The surface of the second working section includes a first arc-shaped extrusion section and a planar clearance section spaced apart. The cross-sectional profile of the second working section is formed by a first arc-shaped segment formed by the first arc-shaped extrusion section and a straight segment formed by the planar clearance section spaced apart. There is a first height difference between the first arc-shaped segment and the straight segment.

[0008] The hot melt drill bit according to the embodiments of this application has at least the following beneficial effects: the drill tip extrusion part of the hot melt drill bit provided by this application is set in a conical shape to facilitate drilling. At the same time, the first working part of the drill tip extrusion part is hemispherical to improve the drilling effect and also to reduce the impact of drilling force and avoid the failure of the drill tip extrusion part. The surface of the second working part includes a first arc-shaped extrusion part and a planar clearance part arranged at intervals. There is a first height difference between the first arc-shaped segment and the straight segment formed by the two on the cross section. While ensuring a certain extrusion effect, the planar clearance part can also improve the problem of adhesion between the hot melt drill and the workpiece material.

[0009] According to some embodiments of this application, the first working part is disposed within a range of 0.05*D extending outward from the axial center relative to the handle, and the second working part is disposed within a range of 0.05*D to 0.85*D extending outward from the axial center relative to the handle.

[0010] According to some embodiments of this application, the first height difference is 0.01 to 0.1 mm.

[0011] According to some embodiments of this application, the length of the first arc segment is 0.25*D.

[0012] According to some embodiments of this application, the guide extrusion part includes a second arc-shaped extrusion part and a second clearance part arranged at intervals. The cross-sectional profile of the guide extrusion part is formed by a second arc-shaped segment formed by the second arc-shaped extrusion part and a clearance segment formed by the second clearance part, which are spaced around each other. There is a second height difference between the second arc-shaped segment and the clearance segment.

[0013] According to some embodiments of this application, the second height difference is 0.01 to 0.1 mm.

[0014] According to some embodiments of this application, the clearance section includes a first transition arc section, a clearance arc section and a second transition arc section connected in sequence, wherein the ends of the first transition arc section and the second transition arc section away from the clearance arc section are respectively connected to two adjacent segments of the second arc section.

[0015] According to some embodiments of this application, the length of the clearance arc segment is 0.45*D.

[0016] According to some embodiments of this application, the length of the second arc segment is 0.15*D.

[0017] According to some embodiments of this application, it also includes an arc-shaped transition connection portion, one end of the guide extrusion portion is connected to the shank portion through the arc-shaped transition connection portion, and the shank portion, the arc-shaped transition connection portion, the guide extrusion portion and the drill tip extrusion portion are integrally formed.

[0018] Additional aspects and advantages of this application 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 this application. Attached Figure Description

[0019] Additional aspects and advantages of this application will become apparent and readily understood in conjunction with the following description of the embodiments, in which:

[0020] Figure 1 This is a schematic diagram of the structure of the thermoplastic drill bit provided in this application;

[0021] Figure 2 For this application Figure 1 A magnified view of a portion of region A;

[0022] Figure 3 Another structural schematic diagram of the thermoplastic drill bit provided in this application;

[0023] Figure 4 For this application Figure 3 A magnified view of a portion of region B;

[0024] Figure 5 A schematic cross-sectional view of the first working section in the thermoplastic drill bit provided in this application;

[0025] Figure 6 A cross-sectional schematic diagram of the second working section in the thermoplastic drill bit provided in this application;

[0026] Figure 7 A cross-sectional schematic diagram of the guide extrusion section in the hot melt drill bit provided in this application.

[0027] The attached icons are numbered as follows:

[0028] Handle 100; Guide extrusion section 200; Second arc-shaped section 210; First transition arc-shaped section 220; Clearance arc-shaped section 230; Second transition arc-shaped section 240; Drill tip extrusion section 300; First working section 310; Second working section 320; First arc-shaped extrusion section 321; Planar clearance section 322; First arc-shaped section 323; Straight section 324; Arc-shaped transition connection section 400. Detailed Implementation

[0029] The embodiments of this application are described in detail below. Examples of the 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 application, and should not be construed as limiting this application.

[0030] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0031] In the description of this application, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0032] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0033] In machining, thermoforming drills are used to solve the problem of joining thin-walled workpieces. The drill bit, rotating at high speed, contacts and rubs against the metal surface, generating temperatures of 600 to 800 degrees Celsius, which softens the metal and increases its ductility. Simultaneously, the drill bit presses down during rotation, causing the softened metal to extend along the circular hole, forming a thicker layer three times the original thickness, capable of withstanding greater torque and tensile force. With the continuous development and upgrading of materials in the 3C industry, from aluminum alloys and stainless steel to titanium alloys, conventional thermoforming drills with ordinary circular cross-sections are prone to tool breakage and low processing efficiency when machining titanium alloys due to the work hardening and bonding issues inherent in titanium.

[0034] Based on this, this application provides a thermoplastic drill bit to solve the above-mentioned technical problems. The thermoplastic drill bit provided by this application will be discussed in detail below.

[0035] Reference Figures 1 to 6This application provides a thermoplastic drill bit, comprising: a shank 100, a guide extrusion part 200, and a drill tip extrusion part 300. One end of the guide extrusion part 200 is connected to the shank 100, and the diameter of the guide extrusion part 200 is D. The drill tip extrusion part 300 is conical and includes a first working part 310 and a second working part 320. The small end of the first working part 310 is connected to the small end of the second working part 320, and the large end of the second working part 320 is connected to the other end of the guide extrusion part 200. The first working part 310 is hemispherical. The surface of the second working part 320 includes a first arc-shaped extrusion part 321 and a planar clearance part 322 spaced apart. The cross-sectional profile of the second working part 320 is formed by a first arc-shaped segment 323 formed by the first arc-shaped extrusion part 321 and a straight segment 324 formed by the planar clearance part 322 spaced around each other. There is a first height difference h1 between the first arc-shaped segment 323 and the straight segment 324.

[0036] The hot melt drill bit provided in this application has a conical extrusion section 300 for better drilling. At the same time, the first working section 310 of the extrusion section 300 is hemispherical to improve the drilling effect and reduce the impact of drilling force, thus avoiding the failure of the extrusion section 300. The surface of the second working section 320 includes a first arc-shaped extrusion section 321 and a planar clearance section 322 arranged at intervals. There is a first height difference h1 between the first arc-shaped segment 323 and the straight segment 324 formed by the two on the cross section. While ensuring a certain extrusion effect, the planar clearance section 322 can also improve the problem of adhesion between the hot melt drill and the workpiece material.

[0037] It should be noted that, in the embodiments of this application, the surface of the second working part 320 is provided with four first arc-shaped extrusion parts 321 and four planar clearance parts 322. The first arc-shaped extrusion parts 321 and the planar clearance parts 322 are distributed at intervals on the periphery of the second working part 320. This application does not specifically limit the arrangement of the first arc-shaped extrusion parts 321 and the planar clearance parts 322.

[0038] Reference Figure 5 and Figure 6 It is understood that the first working part 310 is disposed within a range of 0.05*D extending outward from the shank 100 about the axis, and the second working part 320 is disposed within a range of 0.05*D to 0.85*D extending outward from the shank 100 about the axis. That is, the first working part 310, which is formed in a circular cross-section at an axial position of 0.05*D, not only improves the drilling effect but also mitigates the impact of drilling force and prevents the drill tip extrusion part 300 from breaking off and failing. The second working part 320, which is disposed at an axial position of 0.05*D to 0.85*D, provides a continuous extrusion effect for drilling.

[0039] Reference Figure 6It is understandable that the first height difference h1 is 0.01 to 0.1 mm. A certain first height difference h1 is formed between the first arc segment 323 formed by the first arc extrusion part 321 and the straight segment 324 formed by the planar clearance part 322, thereby improving the problem of adhesion between the hot melt drill and the processed material.

[0040] Continue to refer to Figure 6 It is understandable that the length of the first arc segment 323 is 0.25*D, which allows the second working part 320 to not only ensure a certain extrusion effect, but also improve the adhesion between the hot melt drill and the processed material.

[0041] Reference Figure 7 It is understood that the guide extrusion section 200 includes a second arc-shaped extrusion section and a second clearance section spaced apart. The cross-sectional profile of the guide extrusion section 200 is formed by a second arc-shaped segment 210 formed by the second arc-shaped extrusion section and a clearance section formed by the second clearance section spaced apart. There is a second height difference h2 between the second arc-shaped segment 210 and the clearance section. The second height difference h2 between the second arc-shaped extrusion section and the second clearance section ensures that the titanium alloy material does not completely adhere to the tool material at high temperature during the extrusion process in the second arc-shaped extrusion section, thus preventing tool failure and inability to perform normal machining.

[0042] It should be noted that, in the embodiments of this application, there are four second arc-shaped extrusion parts and four second clearance parts. The second arc-shaped extrusion parts and the second clearance parts are distributed at intervals around the periphery of the guide extrusion part 200. This application does not specifically limit the arrangement of the second arc-shaped extrusion parts and the second clearance parts.

[0043] Continue to refer to Figure 7 It is understandable that the second height difference h2 is 0.01 to 0.1 mm. A certain second height difference h2 is formed between the second arc-shaped segment 210 formed by the second arc-shaped extrusion part and the clearance segment formed by the second clearance part, thereby further improving the problem of adhesion between the hot melt drill and the processed material.

[0044] Continue to refer to Figure 7It is understood that the clearance section includes a first transition arc section 220, a clearance arc section 230, and a second transition arc section 240 connected in sequence. The ends of the first transition arc section 220 and the second transition arc section 240 away from the clearance arc section 230 are respectively connected to two adjacent second arc sections 210. Specifically, the second height difference h2 between the second arc section 210 and the clearance arc section 230 is 0.01 to 0.1 mm. The second arc section 210 and the clearance arc section 230 can ensure a certain extrusion effect during drilling, while also improving the adhesion between the hot melt drill and the workpiece. The second arc section 210 and the clearance arc section 230 are transitioned through the first transition arc section 220 or the second transition arc section 240, which improves the structural stability of the guide extrusion section 200.

[0045] Continue to refer to Figure 7 It is understandable that the length of the clearance arc segment 230 is 0.45*D, and the length of the second arc segment 210 is 0.15*D. The second arc segment 210 and the clearance arc segment 230 can ensure a certain squeezing effect during drilling, while also improving the adhesion between the hot melt drill and the workpiece.

[0046] Reference Figure 1 and Figure 3 It is understood that the hot melt drill bit provided in this application also includes an arc-shaped transition connection part 400. One end of the guide extrusion part 200 is connected to the shank 100 through the arc-shaped transition connection part 400. The shank 100, the arc-shaped transition connection part 400, the guide extrusion part 200 and the drill tip extrusion part 300 are integrally formed, which can increase the overall strength of the tool and prevent the tool from breaking due to axial force and vibration generated during the rotation process, thus playing a role in improving the performance of the tool.

[0047] The hot melt drill bit provided in this application, after the above-mentioned structural design improvement, will undergo post-processing to further enhance the performance of the tool. By performing sandblasting polishing on the entire extrusion part of the tool, the surface roughness of the tool is significantly reduced, the adhesion between the tool material and the workpiece material and the smoothness of the hole wall are improved. At the same time, by coating the extrusion part of the tool, the surface hardness and oxidation resistance temperature of the tool are increased, which can delay the failure of the tool.

[0048] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. A thermoplastic drill bit, characterized in that, include: Handle; A guide extrusion section, one end of which is connected to the handle, and the diameter of the guide extrusion section is D; The drill tip extrusion section is conical and includes a first working section and a second working section. The small end of the first working section is connected to the small end of the second working section, and the large end of the second working section is connected to the other end of the guide extrusion section. The first working section is hemispherical. The surface of the second working section includes a first arc-shaped extrusion section and a planar clearance section that are spaced apart. The cross-sectional profile of the second working section is formed by a first arc-shaped segment formed by the first arc-shaped extrusion section and a straight segment formed by the planar clearance section. There is a first height difference between the first arc-shaped segment and the straight segment. The guide extrusion section includes a second arc-shaped extrusion section and a second clearance section arranged at intervals. The cross-sectional profile of the guide extrusion section is formed by a second arc-shaped segment formed by the second arc-shaped extrusion section and a clearance section formed by the second clearance section, which are spaced around each other. There is a second height difference between the second arc-shaped segment and the clearance section. The clearance section includes a first transition arc-shaped segment, a clearance arc-shaped segment and a second transition arc-shaped segment connected in sequence. The ends of the first transition arc-shaped segment and the second transition arc-shaped segment away from the clearance arc-shaped segment are respectively connected to two adjacent segments of the second arc-shaped segment.

2. The thermoplastic drill bit according to claim 1, characterized in that, The first working part is disposed within a range of 0.05*D extending outward from the axial center relative to the handle, and the second working part is disposed between 0.05*D and 0.85*D extending outward from the axial center relative to the handle.

3. The thermoplastic drill bit according to claim 1, characterized in that, The first height difference is 0.01 to 0.1 mm.

4. The thermoplastic drill bit according to claim 1, characterized in that, The length of the first arc segment is 0.25*D.

5. The thermoplastic drill bit according to claim 1, characterized in that, The second height difference is 0.01 to 0.1 mm.

6. The thermoplastic drill bit according to claim 1, characterized in that, The length of the arc-shaped section for avoiding airflow is 0.45 * D.

7. The thermoplastic drill bit according to claim 1, characterized in that, The length of the second arc segment is 0.15*D.

8. The thermoplastic drill bit according to claim 1, characterized in that, It also includes an arc-shaped transition connection part, one end of the guide extrusion part is connected to the shank through the arc-shaped transition connection part, and the shank, the arc-shaped transition connection part, the guide extrusion part and the drill tip extrusion part are integrally formed.

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