Hard alloy multi-angle drill point twist drill processed by Kevlar special material

Abstract

The utility model provides a hard alloy multi-angle drill point twist drill for processing special Kevlar materials, which comprises a handle part and a blade part which are integrally formed, a drill point is arranged at the front end of the blade part, the drill point is provided with a center tip and an outer side tip, two bottom blades are symmetrically arranged on the drill point along the radial direction, each bottom blade is provided with two rear angle surfaces, and the rear angle surfaces are provided with two rear angle surfaces. The two sides of the connecting position of the bottom blades on the two sides are provided with symmetrical tooth end chip containing grooves, and the circumferential face of the blade part is provided with chip discharging grooves connected with the chip containing grooves. And through the distribution design of the center and the vertex angles on the two sides, the drilling centering effect of the drill bit is improved, it is guaranteed that after positioning, the hole position can be determined on the outer side, the hole precision is improved, the axial cutting resistance is reduced, cutting heat is reduced, and the cutter stability during drilling is improved.

Description

Technical Field

[0001] This utility model relates to the field of cutting tool technology, and in particular to a twist drill with a multi-angled tip made of Kevlar special material for machining cemented carbide, which can be used in the automotive and aerospace industries to process armor, tires, etc. Background Technology

[0002] Kevlar is a composite fiber material with high tensile strength and toughness, low interlaminar shear strength, and poor thermal conductivity. At high temperatures, the resin melts, causing it to adhere to the tool body, leading to difficulties in chip removal, reduced machining capabilities, and decreased product quality and precision. Currently, the market mainly uses drill bits with a combined drill tip. However, this method cannot effectively control hole accuracy and extend tool life. There is an urgent need for a dedicated drill bit made of Kevlar to solve the problems of accuracy control and improve tool life during machining. Utility Model Content

[0003] The technical problem to be solved by this utility model is: in order to overcome the shortcomings of the prior art, this utility model provides a twist drill with a special Kevlar material for machining carbide polygonal drill tips.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a twist drill with a multi-angle tip made of Kevlar special material, comprising an integrally formed shank and a cutting edge. The cutting edge is provided with a drill tip at its front end. The drill tip has a central tip and an outer tip. The drill tip is provided with two bottom cutting edges symmetrically arranged radially. The bottom cutting edges have two rear angle surfaces, namely a first rear angle surface and a second rear angle surface. Symmetrical tooth end chip grooves are provided on both sides of the connection position of the two bottom cutting edges to provide chip folding function. Chip removal grooves are provided on the circumferential surface of the cutting edge and connected to the chip grooves.

[0005] Further preferably, the apex angle α of the central tip is 90°, and the apex angle β of the outer tip is 120°.

[0006] Further preferably, the angle of the first rear corner face is 9°, and the angle of the second rear corner face is 22°.

[0007] Specifically, the bottom edge is a straight-line blade.

[0008] Specifically, the chip removal groove is a straight chip removal groove.

[0009] To further reduce delamination and tearing during Kevlar machining, the drill tip is preferably designed with a core diameter of 25% of the diameter. A thin core thickness is employed, along with a straight chip flute, to prevent tearing and reduce cutting forces.

[0010] The beneficial effects of this utility model are:

[0011] (1) The center and two side corners of the drill tip distribution design improve the centering effect of the drill bit, ensure that after positioning, the outer side can determine the hole position and improve the hole accuracy, reduce the axial cutting resistance, reduce the occurrence of cutting heat and improve the tool stability during drilling.

[0012] (2) The small core and thick straight groove design fully considers the easy delamination and tearing characteristics of Kevlar material, ensures the rigidity of the drill bit, and reduces the cutting force so that it is not easy to delaminate.

[0013] (3) The straight-edge design mainly ensures better edge strength, impact resistance, and more uniform force distribution. During through-hole machining, it prevents material rebound from impacting the drill bit at the moment of drilling, thereby improving the life of the drill bit. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Figure 1 This is a three-dimensional structural diagram of the multi-point twist drill of this utility model.

[0016] Figure 2 This is a side view of the multi-point twist drill of this utility model.

[0017] Figure 3 yes Figure 2 Enlarged schematic diagram of the drill tip.

[0018] Figure 4 This is a schematic diagram of the drill tip of the multi-angle twist drill of this utility model.

[0019] In the diagram: 1. Shank, 2. Cutting edge, 3. Drill tip, 31. Center tip, 32. Outer tip, 4. Bottom cutting edge, 5. First back face, 6. Second back face, 7. Chip groove, 8. Chip removal groove. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention. Therefore, they only show the components, orientations, and references (e.g., up, down, left, right, etc.) relevant to the present invention and are intended only to aid in the description of the features in the drawings. Therefore, the following specific embodiments are not intended to be restrictive, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0021] like Figures 1-4As shown, this utility model discloses a twist drill with a Kevlar-specific material for machining carbide multi-angle drill tips 3. It includes an integrally formed shank 1 and a cutting edge 2, using carbide as the main structure. The cutting edge 2 has a drill tip 3 at its front end, which has a central tip 31 and an outer tip 32. Preferably, the apex angle α of the central tip 31 is 90°, and the apex angle β of the outer tip 32 is 120°. Two bottom cutting edges 4 are symmetrically arranged radially on the drill tip 3. The bottom cutting edges 4 are straight cutting edges 2. Each bottom cutting edge 4 has two clearance faces, a first clearance face 5 and a second clearance face 6. Preferably, the angle of the first clearance face 5 is 9°, and the angle of the second clearance face 6 is 22°. Symmetrical chip-receiving grooves 7 are provided on both sides of the connection position of the two bottom cutting edges 4. A chip-removing groove 8 connected to the chip-receiving grooves 7 is provided on the circumferential surface of the cutting edge 2. The chip-removing groove 8 is a straight chip-removing groove 8. Further preferably, the drill tip 3 is designed with a core diameter of 25%, that is, the outer diameter of the center tip 31 is 25% of the outer diameter of the drill tip 3.

[0022] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the scope of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A Kevlar special material processing hard alloy multi-angle drill tip twist drill, characterized in that: The drill bit comprises an integrated handle and blade, the front end of the blade is provided with a drill tip, the drill tip has a center tip and an outer tip, two bottom edges are symmetrically arranged on the drill tip in the radial direction, the bottom edges have two clearance faces, namely a first clearance face and a second clearance face, and symmetric tooth end chip pockets are arranged on both sides of the connection positions of the two side bottom edges, and a chip pocket is arranged on the periphery of the blade.

2. The Kevlar® specialty material work hardened alloy multi-chute drill tip twist drill of claim 1, wherein: The top angle of the center tip is 90°, and the top angle of the outer tip is 120°.

3. The Kevlar matrix hard alloy multi-chamfered drill tip twist drill of claim 1 wherein: The angle of the first clearance face is 9°, and the angle of the second clearance face is 22°.

4. The Kevlar® specialty material work hardened alloy multi-chute drill tip twist drill of claim 1 wherein: The bottom edge is a straight line type blade.

5. The Kevlar matrix hard alloy multi-chamfered drill tip twist drill of claim 1 wherein: The chip pocket is a straight chip pocket.

6. The Kevlar matrix hardfacing alloy multi-chute drill tip twist drill of claim 1 wherein: The drill tip is designed with a core diameter of 25% of the diameter.

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