Equipment and method for reducing drilling burrs

Abstract

The invention discloses equipment and a method for reducing drilling burrs. The equipment comprises a conductive base plate, and the conductive base plate is electrically connected with a power supply, a current sensing device and a conductive drill bit in sequence; the conductive drill bit is mounted on the drilling machine; and the current sensing device is in communication connection with a control device of the drilling machine. By sensing the position drilled by the drill bit, when the position reaches the joint of the bottom copper foil of the PCB and the insulating plate of the PCB, the feeding speed is reduced, so that the pressure on the bottom copper foil is reduced, and the foil is effectively prevented from being torn to generate burrs.

Description

technical field [0001] The present invention relates to the field of PCB board processing, in particular to a device and method for reducing drilling burrs. Background technique [0002] With the development of high-speed PCB, PCB is developing towards high-level, high-density, pinhole-oriented and high-speed materials. Especially for high-speed materials, due to the poor bonding force between copper foil and substrate, when drilling out the tool, due to the feed of the drill bit. The force is much greater than the bonding force between the copper foil and the substrate, which causes the copper foil to be torn without being cut, resulting in a sharp edge. [0003] In the drilling edge, a large number of researchers in the industry have studied the impact of drilling edge and burr. The main research factors focus on drilling parameters (including rotational speed, feed speed, cutting amount, and retraction speed), drill performance (grinding time) , hole limit, tool tip angl...

AI Technical Summary

Problems solved by technology

However, the essential problem is ignored. The phenomenon of edging on the exit surface of the drill hole generally occurs on the exit surface, but not on the entry surface; for example, in "Drilling performance of different types of backing plates for PCB drilling" "Research" pointed out that although the choice of high hardness phenolic backing plate can reduce the occurrence of burrs, there will still be burrs for large holes; how to solve the problem of burrs with different apertures, from the perspective of force analysis, the root cause is that drilling During the hole process, the drill will give the drill a downward driving force. When the sum of the bonding force between the backing plate and the supporting copper surface, and the copper surface and the PCB board cannot resist the driving force of the drill, the copper foil will be damaged. Being torn but not being cut off by the tangential shear of the drill in time, resulting in edging

Images