Chip breaking drill bit for drilling of high-sensitivity touch PCB (Printed Circuit Board) multi-layer thin plate

Abstract

The utility model discloses a high sensitivity touch control PCB multilayer thin plate drilling chip breaking drill bit which comprises a drill handle and a twist drill body connected to one end of the drill handle, the head of the twist drill body is provided with two main cutting edges which are in central symmetry, the side wall of the twist drill body is provided with two spiral chip grooves corresponding to the two main cutting edges, and the two spiral chip grooves are communicated with the drill handle. V-shaped chip breaker grooves are formed in the two main cutting edges, the sum of the edge widths of the two main cutting edges ranges from 0.28 mm to 0.8 mm, and the radial groove depth of each V-shaped chip breaker groove ranges from 0.05 mm to 0.12 mm; the groove width of the V-shaped chip breaker groove ranges from 0.05 mm to 0.10 mm. The groove width of the V-shaped chip breaker groove is 0.05 mm-0. 15mm. The V-shaped chip breaker groove is formed in the main cutting edge, so that chips can be effectively broken into short and small fragments, and long chip strips are prevented from being formed. Therefore, the risk that cuttings are wound on the drill bit can be reduced, and machining interruption and equipment damage caused by cuttings winding are avoided. The spiral chip grooves corresponding to the main cutting edges are formed in the side wall of the twist drill body and can smoothly guide chips to be discharged, and the chip discharging efficiency is further improved.

Description

Technical Field

[0001] This utility model relates to the field of circuit board processing technology, and in particular to a chip-breaking drill bit for drilling high-sensitivity touch-sensitive multilayer thin PCB boards. Background Technology

[0002] In modern machining, drilling is a common and crucial process. Traditional drill bits often encounter long chips that become entangled in the bit during continuous drilling, impacting processing efficiency and potentially causing workpiece damage, bit wear, or even breakage. To address this issue, specially designed drill bits have emerged to improve chip removal performance, thereby enhancing work efficiency and machining quality.

[0003] However, existing drill bits with improved chip removal capabilities still have some shortcomings. For example, some drill bits promote chip removal by increasing the depth and width of the chip flutes, but this may lead to a decrease in drill bit strength and affect service life. In addition, there are also drill bits with specialized chip-breaking structures, but these structures are often complex, costly to manufacture, and their effectiveness in actual use is not ideal.

[0004] This utility model is based on the above-mentioned circumstances. Utility Model Content

[0005] This invention overcomes the shortcomings of the prior art and provides a chip-breaking drill bit that can be used for high-sensitivity touch control of drilling multilayer thin PCB boards during the drilling process, avoiding the accumulation and entanglement of long chips, thereby improving the smoothness of cutting and the durability of the drill bit.

[0006] This utility model is achieved through the following technical solution:

[0007] A chip-breaking drill bit for drilling high-sensitivity touch-sensitive PCB multilayer thin boards includes a drill shank and a twist drill body connected to one end of the drill shank. The head of the twist drill body has two centrally symmetrical main cutting edges. The side wall of the twist drill body has two helical chip-removing grooves corresponding to the two main cutting edges. V-shaped chip-breaking grooves are formed on the two main cutting edges. The sum of the widths of the two main cutting edges is 0.28-0.8 mm. The radial groove depth of the V-shaped chip-breaking groove is 0.05 mm-0.12 mm. The groove width of the V-shaped chip-breaking groove is 0.05 mm-0.10 mm. The groove width of the V-shaped chip-breaking groove is 0.05 mm-0.15 mm.

[0008] As described above, the chip-breaking drill bit for drilling multilayer thin boards of high-sensitivity touch PCBs has an outer wall surface of a spiral shovel back, and a cutting edge extending into a spiral chip removal groove on the spiral shovel back. The cutting edge is connected to the main cutting edge, and the side of the cutting edge closest to the spiral chip removal groove is a secondary cutting edge.

[0009] The high-sensitivity touch control PCB multilayer sheet drilling chip-breaking drill bit has two main cutting edges, each of which is provided with a V-shaped chip-breaking groove.

[0010] The high-sensitivity touch control PCB multilayer sheet drilling chip-breaking drill bit has a twist drill body with a diameter of 2.10-6.50 mm.

[0011] The high-sensitivity touch control PCB multilayer sheet drilling chip-breaking drill bit has two main cutting edges with an included angle of 130°-165°.

[0012] The high-sensitivity touch control PCB multilayer sheet drilling chip-breaking drill bit has a spiral angle of 40°-45°.

[0013] The high-sensitivity touch control PCB multilayer sheet drilling chip-breaking drill bit has a clearance angle of 30°-45°.

[0014] The high-sensitivity touch control PCB multilayer sheet drilling chip-breaking drill bit has a twist drill body with a diameter of 2.10-6.50 mm.

[0015] Compared with the prior art, the high-sensitivity touch control PCB multilayer sheet drilling chip-breaking drill bit has the following advantages:

[0016] The V-shaped chip-breaking groove on the main cutting edge can effectively break the chips into small pieces, preventing the formation of long chip strips. This helps to reduce the risk of chip winding on the drill bit, avoids processing interruption and equipment damage caused by chip winding. The spiral chip removal grooves on the side wall of the twist drill body correspond to the main cutting edge, which can smoothly guide the chip removal, further improve the chip removal efficiency, reduce the risk of chip blockage, and ensure the continuity and stability of the drilling process. The radial groove depth of the V-shaped chip-breaking groove is 0.05-0.12 mm, the groove width is 0.05-0.10 mm, and the groove width is 0.05-0.15 mm, so that the V-shaped chip-breaking groove can ensure the chip-breaking effect and will not significantly weaken the strength of the drill bit, ensuring the stability and durability of the drill bit under high-strength processing conditions. Due to the significant improvement of chip-breaking and chip-removing performance, the drill bit can maintain a higher feed speed and rotational speed during processing, thereby shortening the processing time and improving the production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0017] The specific embodiments of the utility model will be further described in detail below in combination with the drawings, in which:

[0018] Fig. 1 is the structural schematic diagram of the utility model;

[0019] Fig. 2is a structural schematic view of the twist drill body in the utility model;

[0020] Fig. 3 is a side view schematic view of the utility model;

[0021] Fig. 4 is a rear corner schematic view of the utility model. DETAILED DESCRIPTION

[0022] The utility model will be further described below in combination with the drawings:

[0023] As Figs. 1 to 4 The utility model discloses a kind of high-sensitivity touch PCB multilayer sheet drillings broken chip drill bits, including drill handle 1 and the twist drill body 2 connected in drill handle 1 one end, the head of the twist drill body 2 is equipped with two main cutting edges 3 of central symmetry, two helical chip flute 4 corresponding with two main cutting edges 3 are equipped on the lateral wall of twist drill body 2, V-shaped chip breaker 5 is opened in two main cutting edges 3, the width of two main cutting edges 3 and S is 0.28-0.8mm.V-shaped chip breaker 5's radial groove depth is: 0.05mm-0.12mm;The width of V-shaped chip breaker 5 is: 0.05mm-0.10mm;The width of V-shaped chip breaker 5 is: 0.05mm-0.15mm.Drill handle 1 and the twist drill body 2 are integral structure.

[0024] The utility model discloses a kind of high-sensitivity touch PCB multilayer sheet drillings broken chip drill bits, including drill handle 1 and the twist drill body 2 connected in drill handle 1 one end, the head of the twist drill body 2 is equipped with two main cutting edges 3 of central symmetry, two helical chip flute 4 corresponding with two main cutting edges 3 are equipped on the lateral wall of twist drill body 2, V-shaped chip breaker 5 is opened in two main cutting edges 3, the width of two main cutting edges 3 and S is 0.28-0.8mm.V-shaped chip breaker 5's radial groove depth is: 0.05mm-0.12mm;The width of V-shaped chip breaker 5 is: 0.05mm-0.10mm;The width of V-shaped chip breaker 5 is: 0.05mm-0.15mm.Drill handle 1 and the twist drill body 2 are integral structure.

[0025] Radial depth refers to the depth of V-shaped chip breaker 5 along the radial direction of drill head.Suitable radial depth can help better control the formation and discharge of chip, reduce chip adhesion and entanglement.But too deep radial depth will increase cutting force, possibly leading to unstable processing and tool wear aggravation.

[0026] The axial length refers to the length of the V-shaped chip breaker groove 5 along the axis of the drill bit. A longer axial length can provide more space for chip removal, helping to reduce chip jamming and improve chip removal efficiency. However, an excessively long axial length can weaken the strength of the drill bit, increasing the risk of tool wear and breakage.

[0027] The slot width refers to the width of the V-shaped chip breaker groove 5 in the radial direction of the drill bit. A wider slot width can provide more space for chip removal, helping to reduce chip jamming and improve chip removal efficiency. However, an excessively wide slot width can weaken the strength of the drill bit, increasing the risk of tool wear and breakage.

[0028] The outer wall surface of the twist drill body 2 is a spiral flake back 21, which is provided with a blade 6 extending to the spiral chip removal groove 4. The blade 6 is connected with the main cutting edge 3, and the side of the blade 6 close to the spiral chip removal groove 4 is a secondary cutting edge 61.

[0029] The spiral flake back 21 not only helps to remove chips, but also increases the strength and rigidity of the drill bit, so that it can still maintain good performance under high speed and high load conditions, reducing the risk of deformation and breakage. The secondary cutting edge 61 can disperse the cutting force, reduce the burden of the main cutting edge, and thus reduce the generation of cutting heat and the wear rate. This helps to prolong the service life of the drill bit and reduce the frequency of replacement. The blade 6 is connected with the main cutting edge 3, ensuring the continuity and integrity of the cutting edge, thereby improving the smoothness and precision of the machined surface. The auxiliary cutting effect of the secondary cutting edge 61 also helps to remove small residual materials, further improving the surface quality.

[0030] In an embodiment, each of the two main cutting edges 3 is provided with a V-shaped chip breaker groove 5, and the two V-shaped chip breaker grooves 5 are centrally symmetrical. The two V-shaped chip breaker grooves 5 are centrally symmetrically distributed on the main cutting edge 3, ensuring uniform distribution of cutting force. This symmetry helps to maintain the balance of the drill bit during cutting, reduces vibration and deviation, and improves the accuracy and surface quality of drilling. Of course, each of the two main cutting edges 3 can also be provided with multiple V-shaped chip breaker grooves 5.

[0031] In an embodiment, the blade width and S of the two main cutting edges 3 are 0.28-0.8mm. This blade width can ensure that the cutting edge has sufficient strength during cutting, while maintaining good sharpness. This design can reduce cutting force and reduce the generation of cutting heat, thereby improving cutting quality and tool life while ensuring cutting efficiency.

[0032] The diameter L of the twist drill body 2 is 2.10-6.50mm. The diameter within this range can meet different processing needs, from small holes to larger hole diameters. At the same time, reasonable diameter design can ensure the strength and rigidity of the drill bit under high speed and high load conditions, reducing the risk of deformation and breakage.

[0033] The included angle a of the two main cutting edges 3 is 130°-165°. The included angle in this range can provide good cutting performance and chip removal effect. Larger included angle helps to reduce cutting force and cutting heat, improve the durability of the cutting edge, and reduce the impact of the cutting edge by the chips.

[0034] The helix angle b of the drill tip is 40°-45°. The helix angle in this range can effectively guide the chip removal and reduce the accumulation of chips around the drill tip. The appropriate helix angle can also improve the rigidity and stability of the drill tip, reduce vibration, and improve machining accuracy.

[0035] The relief angle c of the drill tip is 30°-45°. The appropriate relief angle can reduce the friction between the drill tip and the workpiece, reduce the generation of cutting heat, and improve the wear resistance and service life of the drill tip. At the same time, larger relief angle helps to reduce cutting force, improve the accuracy of drilling and surface quality.

Claims

1. A chip breaking drill bit for high sensitivity touch PCB multilayer sheet drilling, characterized by: The twist drill comprises a drill shank (1) and a twist drill body (2) connected to one end of the drill shank (1), the head of the twist drill body (2) is provided with two main cutting edges (3) which are centrally symmetrical, the sidewall of the twist drill body (2) is provided with two spiral chip removal grooves (4) corresponding to the two main cutting edges (3), the two main cutting edges (3) are provided with V-shaped chip breaking grooves (5), the width of the two main cutting edges (3) is 0.28-0.8mm, the radial depth of the V-shaped chip breaking groove (5) is 0.05mm-0.12mm, the width of the V-shaped chip breaking groove (5) is 0.05mm-0.10mm, and the width of the V-shaped chip breaking groove (5) is 0.05mm-0.15mm.

2. The chip breaking drill bit of claim 1, wherein: The outer wall of the twist drill body (2) is a spiral land (21), the spiral land (21) is provided with an edge band (6) extending to the spiral chip removal groove (4), the edge band (6) is connected with the main cutting edge (3), and the side of the edge band (6) close to the spiral chip removal groove (4) is a secondary cutting edge (61).

3. The chip breaking drill bit of claim 2, wherein: The two main cutting edges (3) are each provided with a V-shaped chip breaking groove (5), and the two V-shaped chip breaking grooves (5) are centrally symmetrical.

4. The chip breaking drill bit of claim 3, wherein: The diameter of the twist drill body (2) is 2.10-6.50mm.

5. The chip breaking drill bit of claim 4, wherein: The included angle of the two main cutting edges (3) is 130°-165°.

6. The chip breaking drill bit of claim 5, wherein: The helix angle of the drill point is 40°-45°.

7. The chip breaking drill bit of claim 6, wherein: The clearance angle of the drill point is 30°-45°.

8. The chip breaking drill bit of claim 1, wherein: The drill shank (1) and the twist drill body (2) are in an integral structure.

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