钻具

Abstract

本实用新型属于钻削工具技术领域，公开了一种钻具，包括钻削主体。所述钻削主体包括依次连接的钻尖段和圆周段；所述钻尖段设置有底刃，所述圆周段具有凹陷的避空面，所述圆周段设置有呈螺旋状的排屑槽；所述排屑槽的槽面与所述避空面相接形成圆周刃，所述避空面设置有微槽，所述微槽的延伸方向与所述钻削主体的轴线方向相交；所述微槽的槽面与所述排屑槽的槽面相接形成微槽刃。本实用新型提供的钻具能够提高钻具的毛刺去除率，减少了孔壁的毛刺的量，进而提高产品的合格率。

Claims

1. A drill, characterized in that It includes a drilling body (10), which includes a drill tip section (1) and a circumferential section (2) connected in sequence; The drill tip section (1) is provided with a bottom cutting edge (11), the circumferential section (2) has a recessed clearance surface (21), and the circumferential section (2) is provided with a spiral chip removal groove (3); the groove surface of the chip removal groove (3) is connected to the clearance surface (21) to form a circumferential cutting edge (22), the clearance surface (21) is provided with a micro-groove (23), the extension direction of the micro-groove (23) intersects with the axial direction of the drilling body (10); the groove surface of the micro-groove (23) is connected to the groove surface of the chip removal groove (3) to form a micro-groove cutting edge (231).

2. The drilling tool according to claim 1, characterized in that, The distance between the bottom of the microgroove (23) and the outer circumferential surface of the circumferential segment (2) is J, and the value of J ranges from (0.05-0.2)F, where F is the cutting diameter of the circumferential segment (2).

3. The drill string of claim 1, wherein, The microgroove (23) includes a first groove surface (232) near the drill tip section (1) and a second groove surface (233) away from the drill tip section (1), and the connection between the first groove surface (232) and the second groove surface (233) is rounded. The area of ​​the second groove surface (233) is greater than the area of ​​the first groove surface (232); and / or, the angle between the second groove surface (233) and the circumferential surface of the circumferential segment (2) is the micro-groove half-apex angle H, wherein 20°≤H≤60°.

4. The drill string of claim 1, wherein, The microgrooves (23) are provided in multiple ways, and the multiple microgrooves (23) are spaced apart on the clearance surface (21) along the axial direction of the drilling body (10), and the length directions of the multiple microgrooves (23) are parallel to each other; And / or, the axial back angle of the microgroove (231) ranges from 6° to 15°; And / or, the circumferential back angle of the microgroove (231) is in the range of -5° to 5°.

5. The drill string of claim 1, wherein, The microgroove (23) penetrates the clearance surface (21); Two chip removal grooves (3) and two clearance surfaces (21) are provided. The two chip removal grooves (3) and the two clearance surfaces (21) are alternately arranged along the circumferential direction of the circumferential segment (2). The two chip removal grooves (3) are connected through the micro groove (23).

6. The drill string of any one of claims 1-5, wherein, The drill tip section (1) is coated with a first wear-resistant coating; and / or, the circumferential section (2) is coated with a second wear-resistant coating.

7. The drill string of any one of claims 1-5, wherein, The angle between the extension direction of the chip removal groove (3) and the axis of the drilling body (10) is the helix angle A, where 5°≤A≤40°; And / or, the circumferential groove front angle of the chip removal groove (3) is in the range of 15°-25°.

8. The drill string of any one of claims 1-5, wherein, The clearance surface (21) includes a recessed first surface (211) and a second surface (212) located between the first surface (211) and the groove surface of the chip removal groove (3), the second surface (212) being in contact with the groove surface of the chip removal groove (3) to form the circumferential blade (22).

9. The drilling tool according to claim 8, characterized in that, The second surface (212) has a dimension in the circumferential direction of the circumferential segment (2) ranging from 0.03F to 0.05F; where F is the cutting diameter of the circumferential segment (2).

10. The drill string of any one of claims 1-5, wherein, The bottom cutting edge (11) includes a pair of first main cutting edges (111) and a pair of second main cutting edges (112); the drill tip section (1) is provided with a drill tip tooth clearance surface (12) and a bottom cutting edge relief surface (13), the drill tip tooth clearance surface (12) and the bottom cutting edge relief surface (13) are connected to form the first main cutting edge (111); the groove surface of the chip removal groove (3) is connected to the bottom cutting edge relief surface (13) to form the second main cutting edge (112); The included angle between the two first main cutting edges (111) is the first vertex angle B, where 120°≤B≤150°; The included angle between the two second main cutting edges (112) is the second vertex angle C, where 70°≤C≤100°; The angle between the backlash surface (12) of the drill tip and the axial direction of the drilling body (10) is the backlash angle D, where 0°≤D≤10°; The included angle between the back face of the bottom cutting edge (13) and the radial direction of the drilling body (10) is the back angle E of the bottom cutting edge (11), where 8°≤E≤20°.

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