Novel high-speed accurate grinding drill bit for PCB
By designing a new high-speed precision grinding drill with chip removal grooves and multiple tool faces, the problems of poor cutting chip breaking, too large blade wear and poor hole position accuracy of the micro drill needles in the case of small diameter are solved, and higher cutting performance, wear resistance and positioning accuracy are achieved.
Patent Information
- Application Number
- CN202421902924.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-07
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-08-07
AI Technical Summary
In the case of small diameter, existing micro drilling needles are prone to problems such as poor cutting chip breakage, too much wear on the edge, and poor hole accuracy.
A new high-speed precision grinding drill for PCB is designed, including a tool holder and a drill needle body. The drill needle body is spirally spiraled with two chip discharge grooves on the circumference, and multiple cutting surfaces and transition lines are provided at the tip to form the main cutting edge, horizontal edge and positioning point. Through these structures, the debris generated by cutting are discharged into the chip discharge groove, reducing the heat generation of the tip, increasing wear resistance, and improving cutting performance and positioning accuracy through the cross edge and positioning point.
By setting chip removal grooves and multiple tool surfaces, the heating and wear of the drill tip are reduced, cutting performance and wear resistance are improved, and positioning accuracy and air-avoiding performance are improved through positioning points, which solves the problems of poor cutting chip breaking, large wear of the blade and poor hole position accuracy.
Smart Images
Figure CN223029880U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of PCB drills, in particular to a new type of high-speed precision grinding drill for PCB. Background Art
[0002] The PCB board, also known as the printed circuit board or printed wiring board, is a support for electronic components and a carrier for electrical connection of electronic components. In the production process of the PCB board, a micro drill is required to perform micro hole processing. Some of the processed holes are for making via holes for copper plating to form circuits, and some are for making positioning holes, etc. The drilling quality of the PCB board depends mostly on the structure of the drill pin itself. The influencing factors affecting the drilling hole position accuracy and quality are diverse, such as the stiffness of the drill bit, the cross-sectional shape, the spiral groove angle, etc. At present, when the diameter of the micro drill pin on the market is relatively small, problems such as poor chip breaking during drilling, excessive wear of the cutting edge, and poor hole position accuracy are likely to occur. Content of the Utility Model
[0003] The technical problem to be solved by the utility model is that when the existing micro drill pin has a relatively small diameter, problems such as poor chip breaking during drilling, excessive wear of the cutting edge, and poor hole position accuracy are likely to occur.
[0004] To solve the above problems, the utility model provides a new type of high-speed precision grinding drill for PCB, including a tool shank and a drill pin body. Two chip flutes are circumferentially spirally arranged on the drill pin body. The tip of the drill pin body is provided with two first cutting surfaces and two second cutting surfaces. The chip flute intersects with the first cutting surface to form a main cutting edge. The first cutting surface intersects with the second cutting surface on the same side at an angle A to form a first transition line, and the angle A is 35° - 40°; the first cutting surface intersects with the second cutting surface on the opposite side at an angle B to form a chisel edge, and the angle B is 30° - 35°. The first transition line intersects with the chisel edge to form a positioning point O.
[0005] The new type of high-speed precision grinding drill for PCB provided by the utility model also has the following technical features:
[0006] The angle A is 40°, and the angle B is 35°.
[0007] The tip of the drill pin body is further provided with two third cutting surfaces. The first cutting surface intersects with the third cutting surface to form a second transition line, and a fourth cutting surface is formed between the second cutting surface and the third cutting surface.
[0008] The second cutting surface intersects with the third cutting surface and the chip flute to jointly form an intersection line.
[0009] The main cutting edge intersects with the contour line of the drill pin body to form a main cutting point P.
[0010] The chisel edge intersects with the main cutting edge and the intersection line to jointly form a secondary cutting point Q.
[0011] The chisel edge is arranged between two main cutting edges.
[0012] The utility model has the following beneficial effects: by arranging that the first cutting surface intersects with two second cutting surfaces at an angle A and an angle B respectively, it is convenient to discharge the chips generated by cutting into the chip discharge groove, thereby reducing the heat generation at the tip during the working process of the drill bit body and increasing the wear resistance; a chisel edge is newly formed on the basis of the original main cutting edge, increasing the cutting length and enhancing the cutting performance, wear resistance and clearance performance of the tip of the drill bit body; by arranging a positioning point O, the contact area with the plate to be machined is reduced, making positioning easier, and at the same time reducing the axial resistance during the drilling process of the drill bit body and improving the positioning accuracy. Description of the Drawings
[0013] Figure 1 is an axonometric view of the drill bit of the utility model;
[0014] Figure 2 is an overall structure diagram of the drill bit of the utility model;
[0015] Figure 3 is a schematic diagram of angle A;
[0016] Figure 4 is a schematic diagram of angle B;
[0017] Figure 5 is a schematic diagram of the structure of the drill bit tip. Detailed Embodiment
[0018] The following will describe the utility model in detail with reference to the drawings and in combination with embodiments. It should be noted that, without conflict, the embodiments in the utility model and the features in the embodiments can be combined with each other.
[0019] As Figures 1 to 5 shown, the novel high-speed precision grinding drill bit for PCB of the utility model includes a tool shank 10 and a drill bit body 11. Two chip discharge grooves 12 are spirally arranged circumferentially on the drill bit body 11. Two first cutting surfaces 21 and two second cutting surfaces 22 are arranged at the tip of the drill bit body 11. The chip discharge groove 12 intersects with the first cutting surface 21 to form a main cutting edge 23. The first cutting surface 21 intersects with the second cutting surface 22 on the same side at an angle A to form a first transition line 24, and the angle A is 35° - 40°; the first cutting surface 21 intersects with the second cutting surface 22 on the opposite side at an angle B to form a chisel edge 25, and the angle B is 30° - 35°. The first transition line 24 intersects with the chisel edge 25 to form a positioning point O.
[0020] By setting the first flank 21 to intersect with the two second flanks 22 at angles A and B respectively, it is convenient to discharge the chips generated by cutting into the chip groove 12, thereby reducing the tip heating during the operation of the drill bit body 11 and increasing the wear resistance; a chisel edge 25 is newly formed on the basis of the original main cutting edge 23, increasing the cutting length and enhancing the cutting performance, wear resistance and clearance performance of the tip of the drill bit body 11; by setting the positioning point O, compared with the original positioning chisel edge 25, the contact area with the plate to be machined is reduced, making it easier to position, and at the same time reducing the axial resistance during the drilling process of the drill bit body 11 and improving the positioning accuracy.
[0021] Among them, as the clearance performance is enhanced, the mass of the tip of the drill bit body 11 is also reduced. According to the centrifugal force formula F = ma analysis, when the acceleration at the tip of the drill bit body 11 remains unchanged and the mass decreases, the centrifugal force received by the tip of the drill bit body 11 decreases, thereby reducing the yaw of the drill bit body 11 and making the concentricity better during the rotation of the drill bit, enhancing the positioning accuracy.
[0022] Preferably, referring to Figure 3 、 4 , the angle A is 40° and the angle B is 35°.
[0023] By setting the angle A to 40°, the clearance performance of the second flank 22 is improved; by setting the angle B to 35°, it is avoided that the tip of the drill bit body 11 breaks, and at the same time it is easier to intersect with the first transition line 24 to form the positioning point O.
[0024] Preferably, referring to Figure 1 、 5 , two third flanks 26 are also provided at the tip of the drill bit body 11. The first flank 21 intersects with the third flank 26 to form a second transition line 27, and a fourth flank 28 is formed between the second flank 22 and the third flank 26.
[0025] Preferably, the second flank 22 intersects with the third flank 26 and the chip groove 12 to jointly form an intersection line 29.
[0026] Preferably, the main cutting edge 23 intersects with the contour line 13 of the drill bit body 11 to form a main cutting point P.
[0027] Preferably, the chisel edge 25 intersects with the main cutting edge 23 and the intersection line 29 to jointly form a secondary cutting point Q.
[0028] Preferably, the chisel edge 25 is arranged between the two main cutting edges 23.
[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.
Claims
1. A new type of high-speed fine grinding drill bit for PCB, characterized in that: The drill bit body (11) comprises a tool handle (10) and a drill bit body (11). The drill bit body (11) is provided with two chip grooves (12) in a circumferential spiral. The tip of the drill bit body (11) is provided with two first cutting surfaces (21) and two second cutting surfaces (22). The chip grooves (12) intersect with the first cutting surfaces (21) to form a main cutting edge (23). The first cutting surface (21) intersects with the second cutting surface (22) on the same side at an angle A to form a first transition line (24). The angle A is 35°-40°. The first cutting surface (21) intersects with the second cutting surface (22) on the opposite side at an angle B to form a transverse edge (25). The angle B is 30°-35°. The first transition line (24) intersects with the transverse edge (25) to form a positioning point O.
2. The novel high-speed fine grinding drill bit for PCB according to claim 1, characterized in that: The angle A is 40°, and the angle B is 35°.
3. The new high-speed fine grinding drill bit for PCB according to claim 1, characterized in that: The tip of the drill needle body (11) is further provided with two third cutting surfaces (26); the first cutting surface (21) and the third cutting surface (26) intersect to form a second transition line (27); and a fourth cutting surface (28) is formed between the second cutting surface (22) and the third cutting surface (26).
4. The novel high-speed fine grinding drill bit for PCB according to claim 3 is characterized in that: The second cutting surface (22) intersects with the third cutting surface (26) and the chip removal groove (12) and together form an intersection line (29).
5. The novel high-speed fine grinding drill bit for PCB according to claim 1, characterized in that: The main cutting edge (23) intersects with the contour line (13) of the drill bit body (11) to form a main cutting point P.
6. The novel high-speed fine grinding drill bit for PCB according to claim 4, characterized in that: The chisel edge (25) intersects with the main cutting edge (23) and the intersection line (29) and together form a secondary cutting point Q.
7. The novel high-speed fine grinding drill bit for PCB according to claim 1, characterized in that: The chisel edge (25) is arranged between the two main cutting edges (23).