Micro drill and processing method thereof

A micro-drill and drill-tip technology, applied in metal processing equipment, drill repair, drill accessories, etc., can solve the problems of poor surface roughness and easy damage of the hole wall, improve the surface roughness of the hole wall, reduce cutting Strength and the effect of improving the cutting life

Active Publication Date: 2012-04-18
SHENZHEN JINZHOU PRECISION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the drilling diameter requirements of micro-drills become smaller and smaller, small drills are more likely to be damaged due to cutting strength and long-term cutting. In addition, because the cutting edge of the drill is generally cut at one time, the surface roughness of the formed hole wall is relatively high. Difference

Method used

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  • Micro drill and processing method thereof
  • Micro drill and processing method thereof
  • Micro drill and processing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Such as Figure 4 As shown, the drill tip portion of the drill bit has four cutting edges, which are respectively two first cutting edges 10 corresponding to the flutes 1 and two second cutting edges 20 formed on the first relief surface 12, The second rake face 21 intersects with the second flank face 22 to form the second cutting edge 20, and the second rake face 21 intersects with the first flank face 12. In this embodiment, the second rake face 21 and the first flank 12 are connected by a curved surface, so that the strength of the intersection of the two flanks can be improved, and the curved surface is conducive to the discharge of debris. Such as Figure 5 As shown, the two second cutting edges 20 respectively intersect with the chisel edge 30 at the apex of the drill point, so that the second rake face 21 is in a triangular shape, so that when drilling, in addition to the extrusion of the chisel edge 30, there are also The cutting effect of the second cutting ...

Embodiment 2

[0035] Such as Figure 7 Shown is the second embodiment of the present invention, different from the first embodiment, the second cutting edge 20 of the second embodiment is not compared with the chisel edge 30 at the apex of the drill point, so that the drilling At this time, the chisel edge 30 is still in the extruding state, so as to prevent the second cutting edge 20 from participating in the drilling extrusion and causing excessive wear. However, the accuracy of the hole position formed by drilling in this solution is lower than that of the solution in Embodiment 1.

[0036] In two embodiments of the present invention, the drill bit is provided with a shovel back, such as Figures 4 to 8 As shown, the setting position of the shovel back corresponds to the second relief surface 22 and extends downward along the flute 1 according to its helix angle.

[0037] Of course, the above two embodiments are the situation where the second cutting edge intersects the chisel edge. Ac...

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Abstract

The invention discloses a micro drill and a processing method thereof. The micro drill comprises a chisel edge, two first cutting edges, two first rear knife faces corresponding to the two first cutting edges, two second cutting edges, and two second front knife faces and two second rear knife faces corresponding to the two second cutting edges, wherein two chip removal grooves which are spiral along a drill body correspond to the two first cutting edges; the second front knife faces are formed between the first rear knife faces and the second rear knife faces; the second cutting edges are formed at junctions of the second front knife faces and the second rear knife faces; and the included angle of the second cutting edges relative to a cutting plane is smaller than that of the first cutting edges relative to the cutting plane. Two cutting edges are formed at the drill tip of the drill additionally, and the included angle of the cutting edges relative to the cutting plane is smaller than that of the first cutting edges relative to the cutting plane, so that the cutting service life of the drill is prolonged; in addition, the formed cutting edges are relatively thin, so that the chip removal unobstructed property is improved, and the surface roughness of a hole wall is improved.

Description

technical field [0001] The invention relates to the field of cutting processing, and more specifically, relates to a micro drill bit and a processing method thereof. Background technique [0002] With the development of printed circuit board (PCB) technology and products, the demand for cemented carbide drills is increasing year by year, new types of cemented carbide drills continue to appear, and the requirements for cemented carbide drills are also getting higher and higher. Tungsten carbide drill for PCB (referred to as PCB micro-drill) is a micro-hole processing tool with a complex shape and a spiral groove, which is derived from the traditional twist drill. PCB micro-drills are tiny in size, and the drill tip structure can only be observed with the help of an optical microscope. At present, most PCB manufacturers use CNC drilling machines to process PCB boards. CNC drilling is an important part of the printed board manufacturing process, and carbide drills are the key ...

Claims

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Application Information

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IPC IPC(8): B23B51/00B24B3/24
Inventor郭强付连宇
OwnerSHENZHEN JINZHOU PRECISION TECH