Drill bit without burrs at two ends of drilled hole
By designing the drill of the tip of the blade, the burrs the burrs during the drilling plastic plate were solved, the drilling effect of the burrs was achieved, and the drilling efficiency was improved.
Patent Information
- Application Number
- CN202420208600.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-29
- Publication Date
- 2025-01-28
- Estimated Expiration
- 2034-01-29
AI Technical Summary
When drilling plastic plates, existing drill bits are prone to form convex rings or burrs that adhere to the surface of the plastic plate, resulting in low manual removal efficiency.
Design a drillless drill head at both ends of the drilling hole. The lower end of the knife body is cut obliquely to form a knife tip that bias on one side. The trajectory of the tip of the knife is round. Tanks to avoid the formation of burrs.
When the drill is drilling plastic plate, there will be no burrs, reducing the demand for artificial removal, and improving the drilling efficiency.
Smart Images
Figure CN222406132U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a tool, in particular to a drill bit with no burrs on both ends of a drilled hole. Background Art
[0002] Plastic plates, like wooden plates, are relatively soft materials. It is actually very simple to drill holes in plastic plates. Ordinary twist drill bits can easily drill through them. However, since plastic is a material with high viscosity and high plasticity, the tip of an ordinary twist drill is located at the center of the drill bit. The heat generated by the high-speed rotation of the twist drill causes the plastic in contact with the drill bit to be in a molten state. Although through holes can be easily drilled, the upper and lower ends of the through holes will form convex rings or burrs that protrude from the upper and lower surfaces of the plastic plate and adhere to the upper and lower surfaces of the plastic plate after drilling. These burrs need to be removed manually. In situations where there are many holes, such as densely drilled holes on a plastic filter plate, manual removal is very inefficient. Utility Model Content
[0003] The purpose of the utility model is to overcome the shortcomings of the existing drill bit and disclose a drill bit with no burrs on both ends of the drilled hole. The technical method adopted is:
[0004] A drill bit with no burrs on both ends of the drill hole comprises a shank and a cylindrical cutter body. A chip removal groove is arranged around the surface of the cutter body. Different from the prior art, the lower end of the cutter body is beveled to form a cutter tip, and the cutter tip is offset to one side of the cutter body.
[0005] Furthermore, the angle between the inclined surface of the blade tip formed by beveling the lower end of the blade body and the lower end surface of the original blade body is 20°-50°.
[0006] Furthermore, the angle between the inclined surface of the blade tip formed by beveling the lower end of the blade body and the lower end surface of the original blade body is 30°.
[0007] Further, the diameter of the chip removal groove is equal to the diameter of the tool body, and the center of the chip removal groove is located on the circumferential surface of the tool body.
[0008] Furthermore, the spiral direction of the chip flute is the same as the rotation direction of the drill during feeding.
[0009] Compared with the prior art, the utility model has a simple structure and is easy to manufacture. However, since the blade tip is offset to one side of the blade body, after the blade body rotates at high speed, the trajectory of the blade tip is circular. When it contacts the upper surface of the plastic plate, it can first cut a circular groove and gradually cut out a countersunk hole. When approaching the lower surface of the plastic plate, the blade tip also first cuts out a circular annular groove and gradually cuts out a through hole. There will be no convex rings or burrs adhered to the upper and lower surfaces of the plastic plate, and there is no need for manual removal, which greatly improves efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 It is a structural schematic diagram of the utility model.
[0011] Figure 2 It is a schematic diagram of the state when the bottom end of the utility model is not beveled.
[0012] Figure 3 It is a schematic diagram of the state after the bottom end of the utility model is beveled. DETAILED DESCRIPTION
[0013] like Figure 1-3 The drill bit with no burrs on both ends of the drilling hole shown in the figure comprises a shank 1 and a cylindrical cutter body 2, a chip removal groove 21 is formed around the surface of the cutter body 2, and the lower end of the cutter body 2 is beveled to form a cutter tip 22, and the cutter tip 22 is offset to one side of the cutter body 2. The angle a between the beveled surface of the cutter tip 22 formed by the beveled surface of the cutter body 2 and the lower end surface of the original cutter body is 20°-50°. In this embodiment, the angle a between the beveled surface of the cutter tip 22 formed by the beveled surface of the cutter body 2 and the lower end surface of the original cutter body is 30°.
[0014] In this embodiment, the diameter of the chip groove 21 is equal to the diameter of the cutter body 2, and the center of the chip groove 21 is located on the circumferential surface of the cutter body 2. In this way, the chip groove is large enough to ensure the strength of the cutter body 2.
[0015] The spiral direction of the chip flute 21 is the same as the rotation direction of the drill during feeding.
[0016] The utility model has a simple structure and is easy to manufacture. Since the knife tip is offset to one side of the knife body, after the knife body rotates at high speed, the trajectory of the knife tip is circular. When contacting the upper surface of the plastic plate, the knife tip can first cut a circular groove and gradually cut out a countersunk hole. When approaching the lower surface of the plastic plate, the knife tip also first cuts out a circular annular groove and gradually cuts out a through hole. There will be no convex rings or burrs adhered to the upper and lower surfaces of the plastic plate, and there is no need for manual removal, so the efficiency is greatly improved.
Claims
1. A drill bit with no burrs on both ends of a hole, comprising a shank (1) and a cylindrical cutter body (2), the cutter body (2) having a chip removal groove (21) surrounding the surface thereof, characterized in that: The lower end of the knife body (2) is beveled to form a knife tip (22), and the knife tip (22) is offset to one side of the knife body (2).
2. A drill bit with no burrs on both ends of a hole according to claim 1, characterized in that: The angle (a) between the inclined surface of the blade tip (22) formed by chamfering the lower end of the blade body (2) and the lower end surface of the original blade body is 20°-50°.
3. A drill bit with no burrs on both ends of a hole according to claim 1, characterized in that: The angle (a) between the inclined surface of the blade tip (22) formed by chamfering the lower end of the blade body (2) and the lower end surface of the original blade body is 30 degrees.
4. A drill bit with no burrs on both ends of a hole according to claim 1, characterized in that: The diameter of the chip removal groove (21) is equal to the diameter of the cutter body (2), and the center of the chip removal groove (21) is located on the circumferential surface of the cutter body (2).
5. A drill bit with no burrs on both ends of a hole according to claim 1, characterized in that: The spiral direction of the chip flute (21) is the same as the rotation direction of the drill bit during feeding.