Combined hub drill bit

Abstract

The utility model belongs to the technical field of automobile hub bolt holes, and discloses a combined hub drill bit which comprises a cutter body and an inner-cooling alloy drill bit, a cutter handle is arranged at one end of the cutter body, an inner hole allowing the inner-cooling alloy drill bit to be inserted and matched is formed in the end, away from the cutter handle, of the cutter body, and a fixing piece used for fixing the inner-cooling alloy drill bit is arranged on the cutter body. A conical curved surface matched with an automobile hub bolt hole is arranged at the position, close to the inner hole, of the end, away from the cutter handle, of the cutter body, and a friction-resistant composite sheet is welded to the conical curved surface. According to the drill bit, resistance in the machining process is reduced, the composite sheets are made of high-strength friction-resistant materials, the abrasion resistance of the drill bit is improved, the service life of the drill bit is prolonged, and the machining quality and efficiency of products are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile wheel hub bolt hole processing, in particular to a combined wheel hub drill bit. Background Art

[0002] Automobile wheel hub bolt holes are important components connecting the wheel hub to the vehicle. Each automobile wheel hub usually has five bolt holes. Due to the huge automobile industry market, it is often necessary to drill the bolt holes of automobile wheel hubs in large quantities, and the requirements for tool quality and efficiency are becoming increasingly urgent.

[0003] Since the machining accuracy requirements for automobile wheel hub bolt holes are not high, the wheel hub bolt hole drill bits currently used in most factories are still made of steel cutter bodies welded alloy materials for machining. The welded alloy material is easy to wear and has a short service life. After wear, workers generally grind it manually for reuse. Due to material and structural limitations, the machining quality and efficiency are not high. Therefore, it is necessary to improve the design of the drill bits used for automobile wheel hub machining in related technologies. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a combined hub drill bit.

[0005] The above technical objectives of the present utility model are achieved through the following technical solutions: a combined wheel hub drill bit, comprising a cutter body and an internally cooled alloy drill bit, wherein a cutter body is provided with a cutter handle at one end, an inner hole for the internally cooled alloy drill bit to be plugged in at the end of the cutter body away from the cutter handle, a fixing part for fixing the internally cooled alloy drill bit is provided on the cutter body, a conical surface that cooperates with the bolt hole of the automobile wheel hub is provided at a position close to the inner hole at the end of the cutter body away from the cutter handle, and a friction-resistant composite sheet is welded on the conical surface.

[0006] By adopting this technical solution, the internally coolant alloy drill bit is detachably connected to the inner hole of the cutter body. After prolonged use, the internally coolant alloy drill bit can be replaced by unscrewing the fixings, ensuring the normal use of the combined wheel hub drill bit and the processing of automotive wheel hub threaded holes. The tapered surface design better fits the automotive wheel hub threaded hole, which helps reduce resistance during the processing process. The composite plate is made of high-strength and friction-resistant material, which improves the wear resistance of the drill bit and extends the drill bit's service life, thereby improving product processing quality and efficiency.

[0007] Furthermore, the composite sheet is a PCD composite sheet, and two composite sheets are provided and symmetrically distributed on both sides of the blade body.

[0008] By adopting the above technical solution, the PCD composite sheet is welded by high-frequency welding and then placed in a vacuum furnace for solid welding. The cutting edge is processed by laser or CNC five-axis linkage grinder discharge machining. The PCD composite sheet has ultra-high structural strength and wear resistance. The two composite sheets work together to enhance the wear resistance and strength of the drill bit, reduce the wear rate of the drill bit, and extend its service life.

[0009] Furthermore, a shank is provided at one end of the internally cooled alloy drill bit, the shank is plugged into the inner hole, a cutting plane is provided on one side of the shank, and the fixing part is a bolt that is provided on the side wall of the cutter body and is threadedly connected to the cutter body, and the end of the bolt is tightly pressed against the cutting plane.

[0010] By adopting the above technical solution and setting the cutting plane, the bolt plays a good tightening role on the shank of the internally cooled alloy drill bit, thereby enhancing the fixing effect of the internally cooled alloy drill bit.

[0011] Furthermore, an elliptical groove is provided on the cutting plane for enhancing the tightening effect of the bolt on the handle.

[0012] By adopting the above technical solution, the probability of the internally cooled alloy drill bit becoming loose is further reduced.

[0013] Furthermore, the cutter body is provided with a central inner cooling hole coaxially arranged with the cutter body, and the inner cooling alloy drill bit is provided with an inner cooling outlet hole connected with the central inner cooling hole.

[0014] By adopting the above technical solution, the central inner cooling hole and the inner cooling outlet hole are set, so that when the drill bit is drilling, there is always coolant to cool the drill bit's edge band, which plays the role of cooling, lubricating and flushing out iron chips produced by the drill bit.

[0015] Furthermore, an L-shaped connecting hole communicating with the central inner cooling hole is provided at one end of the tool body away from the tool handle.

[0016] Furthermore, the angle between the end of the composite sheet away from the conductor axis and the blade of the composite sheet is 12°.

[0017] By adopting the above technical solution, it is beneficial to reduce the cutting resistance of the drill bit during the drilling process of the automobile wheel hub threaded hole, thereby ensuring the processing efficiency.

[0018] In summary, the present invention has the following beneficial effects:

[0019] 1. This application is conducive to reducing the resistance during the processing. The composite sheet is made of high-strength and friction-resistant materials, which improves the wear resistance of the drill bit, extends the service life of the drill bit, and is conducive to improving the processing quality and efficiency of the product;

[0020] 2. In this application, the PCD composite sheet has ultra-high structural strength and wear resistance. The two composite sheets work together to enhance the wear resistance and strength of the drill bit, reduce the wear rate of the drill bit, and extend its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the present utility model;

[0022] Figure 2 This is a schematic structural diagram of the blade body in Example 1 of the present utility model;

[0023] Figure 3 This is a schematic structural diagram of an internally cooled alloy drill bit in Example 1 of the present utility model;

[0024] Figure 4 It is a side view of the handle in Example 1 of the present utility model;

[0025] Figure 5 This is a side view of the internally cooled alloy drill bit in Example 1 of the present utility model;

[0026] Figure 6 This is a side view of the blade body in Example 1 of the present utility model;

[0027] Figure 7 It is a structural schematic diagram of the internally cooled alloy drill bit in Example 2 of the present utility model.

[0028] In the figure: 1. Cutter body; 11. Cutter handle; 12. Inner hole; 13. Center coolant hole; 14. Chip groove; 15. L-shaped connecting hole; 2. Internally coolant alloy drill; 21. Internally coolant outlet hole; 22. Shank; 221. Cutting plane; 3. Fixing part; 4. Conical surface; 5. Composite plate; 6. Oval groove. DETAILED DESCRIPTION

[0029] The technical solutions 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; it is obvious that the described embodiments are only part of the embodiments of the present application, rather than all 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.

[0030] Example 1

[0031] like Figure 1-6As shown, the embodiment of the present application discloses a combined wheel hub drill bit, including a cutter body 1 and an internally cooled alloy drill bit 2, a cutter body 1 having a shank 11 at one end, an inner hole 12 for plugging and fitting the internally cooled alloy drill bit 2 at the end of the cutter body 1 away from the shank 11, a fixing part 3 for fixing the internally cooled alloy drill bit 2 is provided on the cutter body 1, a conical surface 4 for fitting with the automobile wheel hub bolt hole is provided at a position near the inner hole 12 at the end of the cutter body 1 away from the shank 11, and a friction-resistant composite sheet 5 is welded on the conical surface 4, specifically: the composite sheet 5 is a PCD composite sheet 5, and two composite sheets 5 are provided and symmetrically distributed on both sides of the cutter body 1.

[0032] The cutter body 1 is provided with a central internal coolant hole 13 coaxially disposed therewith. The internal coolant alloy drill bit 2 is provided with an internal coolant outlet hole 21 connected to the central internal coolant hole 13. An L-shaped connecting hole 15 is provided at the end of the cutter body 1 away from the shank 11, which is connected to the central internal coolant hole 13. The arrangement of the central internal coolant hole 13, the internal coolant outlet hole 21, and the L-shaped connecting hole 15 ensures that coolant is always available to cool the drill bit's edge during drilling, providing cooling, lubrication, and flushing out scrap metal produced by the drill bit.

[0033] In this embodiment, the cutter body 1 is made of high-quality alloy steel. Prior to heat treatment, the cutter body 1 is turned. The chip flutes 14 and the central coolant hole 13 are machined using a CNC machining center. After heat treatment, the inner hole 12 for mounting the internally coolant alloy drill 2 is finely machined, and the outer diameter and shank 11 are finely ground. The internally coolant alloy drill 2 is manufactured from imported double-helix bar stock with internally coolant holes 21. The machining process for the internally coolant alloy drill 2 is as follows: cutting, center grinding, external cylindrical grinding, CNC five-axis machining, and side solid surface grinding. (The detailed machining process for each step is prior art and irrelevant to the technical problem to be solved by this application, so no further elaboration is required.)

[0034] The internally coolant alloy drill bit 2 is detachably connected to the inner hole 12 of the cutter body 1. After prolonged use, the drill bit 2 can be replaced by removing the fixing member 3, ensuring the proper function of the combined wheel hub drill and the machining of threaded holes in automotive wheel hubs. The tapered surface 4 conforms more closely to the threaded hole in the automotive wheel hub, reducing resistance during machining. The composite plate 5 is made of a high-strength, friction-resistant material, enhancing the drill bit's wear resistance and extending its service life, thereby improving both machining quality and efficiency.

[0035] The PCD composite sheet 5 is welded by high-frequency welding and then placed in a vacuum furnace for secure welding. The cutting edge is processed by laser or CNC five-axis linkage grinding machine discharge machining. The PCD composite sheet 5 has ultra-high structural strength and wear resistance. The two composite sheets 5 work together to enhance the wear resistance and strength of the drill bit, reduce the wear rate of the drill bit, and extend its service life.

[0036] In order to facilitate the fixation of the internally cooled alloy drill bit 2, a shank 22 is provided at one end of the internally cooled alloy drill bit 2. The shank 22 is plugged into the inner hole 12. A cutting plane 221 is provided on one side of the shank 22. The fixing part 3 is a bolt that is provided on the side wall of the cutter body 1 and is threadedly connected to the cutter body 1. The end of the bolt is tightly pressed against the cutting plane 221.

[0037] In order to reduce the cutting resistance of the drill bit during the drilling process of the threaded hole of the automobile wheel hub, the angle between the end of the composite sheet 5 away from the conductor axis and the cutting edge of the composite sheet 5 is 12°.

[0038] The combined wheel hub drill bit in this embodiment utilizes the following principles: The internally coolant alloy drill bit 2 is detachably connected to the inner hole 12 of the cutter body 1. After prolonged use, the internally coolant alloy drill bit 2 can be replaced by unscrewing the fixing member 3, ensuring the normal operation of the combined wheel hub drill bit and the machining of threaded holes in automobile wheel hubs. The tapered surface 4 conforms more closely to the threaded hole in the automobile wheel hub, reducing resistance during machining. The composite plate 5 is made of a high-strength, friction-resistant material, enhancing the drill bit's wear resistance and extending its service life, thereby improving both machining quality and efficiency.

[0039] Example 2

[0040] like Figure 7 As shown, the only difference between this embodiment and embodiment 1 is that in order to further reduce the probability of slipping and loosening of the internally cooled alloy drill 2 during use, an elliptical groove 6 is provided on the cutting plane 221 for enhancing the tightening effect of the bolt on the shank 22.

[0041] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, certain improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A combined hub drill bit, characterized by: The invention comprises a cutter body (1) and an internally cooled alloy drill bit (2), wherein a cutter handle (11) is provided at one end of the cutter body (1), an inner hole (12) for plugging and fitting the internally cooled alloy drill bit (2) is provided at the end of the cutter body (1) away from the cutter handle (11), a fixing member (3) for fixing the internally cooled alloy drill bit (2) is provided on the cutter body (1), a conical surface (4) for fitting with a bolt hole of an automobile wheel hub is provided at a position close to the inner hole (12) at the end of the cutter body (1) away from the cutter handle (11), and a friction-resistant composite sheet (5) is welded on the conical surface (4).

2. The combined hub drill bit according to claim 1, characterized in that: The composite sheet (5) is a PCD composite sheet (5), and two composite sheets (5) are provided and symmetrically distributed on both sides of the blade body (1).

3. The combined hub drill bit according to claim 1, characterized in that: One end of the internally cooled alloy drill bit (2) is provided with a shank (22), the shank (22) is plugged into the inner hole (12), and one side of the shank (22) is provided with a cutting plane (221). The fixing member (3) is a bolt that is provided on the side wall of the cutter body (1) and is threadedly connected to the cutter body (1), and the end of the bolt is tightly pressed against the cutting plane (221).

4. The combined hub drill bit according to claim 3, characterized in that: An elliptical groove (6) is provided on the cutting plane (221) for enhancing the tightening effect of the bolt on the shank (22).

5. The combined hub drill bit according to claim 3, characterized in that: The cutter body (1) is provided with a central inner cooling hole (13) coaxially arranged with the cutter body (1), and the inner cooling alloy drill bit (2) is provided with an inner cooling outlet hole (21) in communication with the central inner cooling hole (13).

6. The combined hub drill bit according to claim 5, characterized in that: An L-shaped connecting hole (15) communicating with the central inner cooling hole (13) is provided at one end of the knife body (1) away from the knife handle (11).

7. The combined hub drill bit according to claim 3, characterized in that: The angle between the end of the composite sheet (5) away from the conductor axis and the blade of the composite sheet (5) is 12°.

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