High-precision resin diamond micro-drilling excircle grinding wheel and application

Abstract

The invention discloses a high-precision resin diamond micro-drilling excircle grinding wheel and an application. By means of the grinding wheel and the application, the problem that product machining efficiency is low, rejection rate is high, a cutting edge is not sharp and the like due to the fact that a printed circuit board (PCB) drill material is high in hardness, abrasion resistance and brittleness and small in drill edge diameter (0.10-6.50mm) and the like is solved. The grinding wheel is composed of a base body and a work grinding material layer. The work grinding material layer comprises, by weight, 50-70% of resin binder, 10-20% of white corundum, 1-5% of nanoscale MgO, 5-15% of copper powder, 1-10% of nanoscale TiO2, 10-20% of diamond and 5-10% of CBN. The grinding wheel has the advantages of being high in grinding efficiency; being good in grinding wheel shape retention and high in abrasion resistance; being low in grinding temperature and good in heat conduction; being high in ground workpiece precision and sharp in cutting edge; greatly reducing rejection rate caused by needle breaking.

Description

technical field

[0001] The invention relates to the field of machinery and electronic equipment, in particular to a high-precision resin diamond micro-drilling outer circle grinding wheel for grinding the outer circle of the drill bit diameter of a printed circuit board. Background technique

[0002] Printed circuit board (PCB—Printed Circuit Board), also known as printed circuit board and printed circuit board, is an important electronic component, a support for electronic components, and a provider of electrical connections for electronic components. Before the appearance of PCB, the interconnection between electronic components was realized by direct connection of wires, but now PCB has occupied an absolute dominant position in the electronics industry.

[0003] With the popularization of electronic equipment and technological progress, the demand for PCBs is also increasing, and drilling accounts for 30-40% of the cost of PCBs, and mass production requires more specializ...

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