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PCB mini drill bit

A micro-drill and drill technology, applied in the direction of twist drills, etc., can solve the problems of affecting the quality of the hole wall, increasing the manufacturing cost, and sticking to the hole wall, so as to reduce the roughness of the hole wall, reduce the generation of cutting heat, and reduce the surface friction. small effect

Pending Publication Date: 2018-05-22
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The material used for PCB micro-drilling is generally cemented carbide. Due to its small drill diameter, the manufacturing cost increases with the decrease of the drill diameter.
Nowadays, most micro drills use the design of spiral grooves to discharge drill chips. The auxiliary cutting edge of the drill generally does not perform cutting movement on the hole wall. The drill dirt generated during the drilling process may adhere to the hole wall due to extrusion. Secondly, the tool During the rotation process, chips will affect the quality of the hole wall and affect the subsequent copper plating and other processes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A PCB micro-drill, characterized in that it includes a second-order cutting edge and two first main flanks, from close to the drill tip 1 to far away from the drill tip, the angle between the main flank and the central axis of the drill gradually decreases;

[0028] Including the chisel edge 2, the flank corresponding to the cutting edge, the first cutting edge 4, the second cutting edge 6, the corresponding first flank 3, the second flank 5, along the The flutes 15 of the drill body helix correspond to the cutting edges respectively.

[0029] Further, the second cutting edge farthest from the center of the drill intersects with the secondary cutting edge 9 at one point, and the third main flank surface farthest from the drill tip intersects with the edge band 12 on one side, and the second-order cutting edge corresponds to The rake face 11 is on the same plane, and the length of the cutting edge decreases from the drill tip and then increases. In the present invention...

Embodiment 2

[0044] A PCB micro-drill, characterized in that it includes a third-order cutting edge 13 and three first main flanks, from near the drill point 1 to away from the drill point, the angle between the main flank and the central axis of the drill gradually decreases;

[0045] Including the chisel edge 2 and the flank corresponding to the cutting edge, the first cutting edge 4, the second cutting edge 6, and the third cutting edge 8 are in turn close to the drill tip, and the corresponding first flank 3, the second The flank 5, the third flank 7, and the flute 15 spiraling along the drill body correspond to the cutting edge respectively.

[0046]Further, the last pair of third cutting edges farthest from the drill center and the secondary cutting edge 9 intersect at one point, and the third main flank and the rib 12 farthest from the drill tip intersect on one side, and the third-order cutting The rake face 11 corresponding to the edge is on the same face, and the length of the cu...

Embodiment 3

[0061] A PCB micro-drill, characterized in that it includes a fourth-order cutting edge and four first main flanks, the main flanks correspond to the cutting edges and have the same number, from close to the drill point to far away from the drill point, the main flank The angle between the surface and the central axis of the drill bit gradually decreases;

[0062] Including the chisel edge, the flank corresponding to the cutting edge, from the first cutting edge to the fourth cutting edge near the drill point, and the corresponding first flank to the fourth flank, along the helical row of the drill body The chip flutes correspond to the cutting edges, respectively.

[0063] Further, the last pair of cutting edges and minor cutting edges farthest from the drill center intersect at one point, the main flank and the edge band farthest from the drill point intersect on one side, and the corresponding multi-stage cutting edges The rake face is on the same face, and the length of t...

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Abstract

The invention provides a PCB mini drill bit. The PCB mini drill bit is characterized by comprising multi-order cutting edges and a plurality of first main rear cutter faces, the main rear cutter facescorrespond to the cutting edges, the main rear cutter faces and the cutting edges are the same in number, and the included angles between the main rear cutter faces and the center axis of the drill bit are gradually reduced from the position close to a drill point to the position away from the drill point; a transverse edge and rear cutter faces corresponding to the cutting edges are included, the cutting edges are sequentially arranged from the first cutting edge to the nth cutting edge from the position close to the drill point, correspondingly, the rear cutter faces are sequentially arranged from the first rear cutter face to the nth rear cutter face, and chip grooves spirally arranged along a drill body correspond to the cutting edges correspondingly. Through the multi-drill-point-angle structural design, the cutting capability of the cutting edges is improved, abrasion of auxiliary cutting edges is reduced, the service life of the drill bit is prolonged, the cutting capability ofthe auxiliary cutting edges is guaranteed, and few holes are rough. Due to ridge belts, the space of the chip grooves can be enlarged, and the chip discharging capability is improved.

Description

technical field [0001] The invention belongs to the technical field of PCB processing, and in particular relates to a PCB micro-drill. Background technique [0002] With the development of the electronics industry, the micro-hole manufacturing process technology of printed circuit boards determines the degree of integration of electronic products. Nowadays, most of the microholes of printed circuit boards are manufactured by mechanical drilling, and the diameter of the drill used is generally small, and the failure rate of the drill is also high. The material used for PCB micro-drilling is generally cemented carbide. Due to its small drill diameter, the manufacturing cost increases with the decrease of the drill diameter. Nowadays, most micro drills adopt the design of spiral grooves to discharge drill chips. The auxiliary cutting edge of the drill generally does not perform cutting movement on the hole wall. The drill dirt generated during the drilling process may adhere...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23B51/02
CPCB23B51/02
Inventor 李之源郑李娟王成勇黄欣何醒荣林淡填刘庆伦
Owner GUANGDONG UNIV OF TECH