Drill point for PCB (printed circuit board) processing
By designing the drilling needle blade belt to shrink along the drilling needle axial direction and form escape gap, the hole wall wear and chip drainage problems caused by the blade belt width in the prior art are solved, and the opening quality and heat dissipation of PCB drilling needles are improved performance.
Patent Information
- Application Number
- CN202421123412.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-22
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2034-05-22
AI Technical Summary
The existing PCB drill needle has a thick edge band width, resulting in poor quality of hole wall processing and limited effective size of chip discharge grooves, which is not conducive to heat dissipation and chip discharge.
A drill needle is designed, and its blade belt retracts inward along the drill needle axial to form an escape gap. The diameter of the blade belt on the side close to the main cutting surface and the auxiliary cutting surface is the diameter of the drill needle, and the diameter away from the side close to the intersection line. For the escape gap diameter, the escape gap width is 0.08 to 0.15 times the diameter of the drill needle, the ratio of the blade width to the drill needle diameter is 0.11 to 0.15, and the end surface of the blade belt is equipped with chip breaking grooves and a thick core-thick groove.
The contact area between the drill bit and the hole wall is effectively reduced, the drilling quality is improved, and the performance of PCB drilling needle is improved by escaping the gap to assist chip removal and heat dissipation.
Smart Images
Figure CN222328470U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of PCB drill pins, in particular to a drill pin for processing PCB plates. Background Art
[0002] The development of micro-drills for PCB directly promotes or restricts the development of the PCB manufacturing industry. As far as the existing technology is concerned, the blade width of the PCB drill is relatively thick, and the contact area between the drill and the hole wall is relatively large, resulting in poor hole wall processing quality; in addition, under the premise of a certain drill diameter, the wider blade will occupy more space, limiting the effective size of the chip groove, which is not conducive to heat dissipation and chip removal. Utility Model Content
[0003] Purpose of the utility model: to provide a drill needle for PCB board processing to solve the above problems existing in the prior art.
[0004] Technical solution: A drill needle for processing PCB plates, comprising a needle handle structure and a drill bit structure connected to the end of the needle handle structure, wherein the edge band of the drill bit structure is retracted along the axial direction of the drill needle, the diameter of the edge band on the side close to the intersection line of the main cutting surface and the auxiliary cutting surface is the drill needle diameter, and the diameter of the edge band on the side away from the intersection line of the main cutting surface and the auxiliary cutting surface is the escape diameter, and an escape gap is formed between the drill needle diameter and the escape diameter.
[0005] Furthermore, the width of the escape gap is S, S=λD, wherein D is the drill bit diameter, λ is the escape coefficient, and 0.08≤λ≤0.15.
[0006] Furthermore, the length of the drill bit diameter of the margin extending along the axial direction of the drill bit is L, and 0.5mm≤L≤3mm.
[0007] Furthermore, the ratio of the margin width to the drill bit diameter is X, X=H / D, 0.11≤X≤0.15, wherein H is the margin width, and D is the drill bit diameter.
[0008] Furthermore, the edge face of the cutting edge is a main cutting face, and a chip breaker groove is provided on one side of the cutting edge of the main cutting face.
[0009] Furthermore, the blade band is provided with a core-thickness thinning groove at the end of the transverse edge.
[0010] Beneficial effects: The utility model reduces the effective diameter of the cutting edge (drill bit diameter) in the axial direction of the drill bit, thereby effectively reducing the contact area between the drill bit structure and the hole wall, alleviating the wear of the hole wall caused by the large contact area under the high-speed rotation of the drill bit, thereby improving the hole opening quality of the PCB drill bit; in addition, the reduced diameter design of the cutting edge forms an escape gap, which has the ability to assist in chip removal and heat dissipation, thereby achieving performance improvement of the PCB drill bit. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a structural schematic diagram of the utility model;
[0012] Figure 2 It is the front view of the utility model;
[0013] Figure 3 It is a cross-sectional view of the present utility model.
[0014] The accompanying drawings are marked as follows: 1. main cutting surface; 2. auxiliary cutting surface; 3. chip groove; 4. transverse edge; 5. core thinning groove; 6. cutting edge; 7. chip breaker groove; 8. margin; 9. escape gap. DETAILED DESCRIPTION
[0015] In the following description, a large number of specific details are given to provide a more thorough understanding of the utility model. However, it is obvious to those skilled in the art that the utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the utility model, some technical features known in the art are not described.
[0016] like Figure 1-Figure 3 As shown, a drill needle for processing PCB board materials includes a needle handle structure and a drill bit structure connected to the end of the needle handle structure. The edge band 8 of the drill bit structure is retracted along the axial direction of the drill needle. The diameter of the edge band 8 on the side close to the intersection line of the main cutting surface 1 and the auxiliary cutting surface 2 is the drill needle diameter, and the diameter of the edge band 8 on the side away from the intersection line of the main cutting surface 1 and the auxiliary cutting surface 2 is the escape diameter. An escape gap 9 is formed between the drill needle diameter and the escape diameter.
[0017] The utility model reduces the effective diameter of the edge band 8 (drill bit diameter) in the axial direction of the drill bit, so that the contact area between the drill bit structure and the hole wall is effectively reduced, and the wear of the hole wall caused by the large contact area under the high-speed rotation of the drill bit is alleviated, thereby improving the drilling quality of the PCB drill bit; in addition, the reduced diameter design of the edge band 8 forms an escape gap 9, and the escape gap 9 has the ability to assist chip removal and heat dissipation, thereby realizing the performance improvement of the PCB drill bit.
[0018] The width of the escape gap 9 is S, S = λD = DD T , where D is the drill bit diameter, D T is the escape diameter, λ is the escape coefficient, 0.08≤λ≤0.15. The escape gap 9 mainly plays the role of reducing the contact area between the edge band 8 and the hole wall. When the escape gap 9 is too small, although it can play a certain auxiliary heat dissipation function, the chips cannot pass smoothly, and the chips are prone to block and entangle the drill bit. Therefore, the minimum width of the escape gap 9 should allow the chips to pass smoothly; and the maximum width of the escape gap 9 should not affect the strength of the drill bit in the drill bit structure.
[0019] The length of the drill bit diameter of the edge band 8 extending along the drill bit axial direction is L, 0.5mm≤L≤3mm. L is the length of the effective diameter of the edge band 8 in the drill bit axial direction. The shorter the length, the smaller the contact area between the drill bit side wall and the hole wall. However, it must not be less than 0.5mm, otherwise the cutting blade 6 will deflect, causing serious processing problems.
[0020] Furthermore, the ratio of the land width to the drill bit diameter is X, X=H / D, 0.11≤X≤0.15, where H is the land width and D is the drill bit diameter. Effectively controlling the ratio of the land width to the drill bit diameter can maximize the effective space of the chip groove 3 on the basis of the drill bit structural strength. The chip removal and heat dissipation capabilities of the chip groove 3 are improved, which is beneficial to the high-speed application of the PCB drill bit.
[0021] The end face of the edge band 8 is the main cutting face 1, and the main cutting face 1 is provided with a chip breaker groove 7 on one side of the cutting edge 6. The chip breaker groove 7 is a linear arc type chip breaker groove, and the chip breaker groove 7 is arranged in the middle of the cutting edge 6, a part of the cutting is cut off from the chip breaker groove 7, and the other part is cut off from the escape gap 9 and the hole wall position.
[0022] The edge band 8 is provided with a core thinning groove 5 at the end of the transverse edge 4. The core thinning groove 5 reduces the contact area between the main cutting face 1 and the plate at the transverse edge 4, reducing the heat generated by the friction between the drill bit and the plate. In addition, the core thinning groove 5 further reduces the cross-sectional area of the edge band 8. The core thinning groove 5 has little effect on the structural strength of the drill bit and has a promoting effect on the chip removal and heat dissipation performance of the chip removal groove 3.
[0023] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings; however, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical scheme of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.
Claims
1. A drill needle for PCB plate processing, comprising a needle handle structure and a drill bit structure connected to the end of the needle handle structure, characterized in that: The cutting edge (8) of the drill bit structure is retracted along the axial direction of the drill bit, the diameter of the cutting edge (8) on the side close to the intersection line of the main cutting surface (1) and the auxiliary cutting surface (2) is the drill bit diameter, the diameter of the cutting edge (8) on the side away from the intersection line of the main cutting surface (1) and the auxiliary cutting surface (2) is the escape diameter, and an escape gap (9) is formed between the drill bit diameter and the escape diameter.
2. A drill needle for PCB plate processing according to claim 1, characterized in that: The width of the escape gap (9) is S, S=λD, wherein D is the drill bit diameter, λ is the escape coefficient, and 0.08≤λ≤0.
15.
3. A drill needle for PCB plate processing according to claim 2, characterized in that: The length of the drill bit diameter of the edge band (8) extending along the axial direction of the drill bit is L, and 0.5mm≤L≤3mm.
4. A drill needle for PCB plate processing according to claim 3, characterized in that: The ratio of the width of the edge band (8) to the diameter of the drill bit is X, X=H / D, 0.11≤X≤0.15, wherein H is the width of the edge band (8) and D is the diameter of the drill bit.
5. A drill needle for PCB plate processing according to claim 4, characterized in that: The end face of the cutting edge (8) is a main cutting face (1), and the main cutting face (1) is provided with a chip breaker groove (7) on one side of the cutting blade (6).
6. A drill needle for PCB plate processing according to claim 5, characterized in that: The blade band (8) is provided with a core-thickness thinning groove (5) at the end of the transverse blade (4).