Drill point special for soft-hard combination plate

Abstract

The invention discloses a drill point special for a soft-hard combination plate. The drill point comprises a drill knife and a knife handle; the angle alpha of a drill tip of the drill knife is 125-135 degrees, the diameter phiD of the knife handle is 3.0-3.2 mm, the thickness d of a drill core of the drill knife is 0.05-0.06 mm, and the helical angle beta of the drill knife is 33-39 degrees; andthe first face angle gamma1 is 12-18 degrees, and the second face angle gamma2 is 27-33 degrees. The overall length L1 of the drill point is 35-42 mm, and the length L2 of a knife edge of the drill knife is 2.2-2.8 mm. According to the drill point, the problems of adhering, rotary profiling and burrs existing in the machining process of soft-hard combination plates for a long time in the industryare solved, machined holes are smoother and higher in quality, the reject ratio of products is reduced to 0-2%, and in addition, the hole wall roughness can be controlled to be within 10 [mu]m.

Description

technical field [0001] The invention relates to the technical field of PCB mechanical process, in particular to a special drill for soft-rigid boards. Background technique [0002] Rigid-flex board is a comprehensive product combining soft board and hard board. It is widely used in high-precision electronic products. With the rapid development of electronic products, such as: mobile phone camera pixel The drilling quality requirements of hard bonded boards are getting higher and higher. Rigid-flex boards are different from pure soft boards and hard boards. Conventional soft-board drills have insufficient hardness requirements for soft-rigid boards, while pure hard board drills have insufficient defects for the soft part of soft-hard boards. Therefore, the drilling effect cannot meet the quality requirements of the product. The roughness of the production hole wall is required to be less than 25um, but the actual production of 15% to 20% of the product hole wall roughness wi...

AI Technical Summary

Problems solved by technology

Rigid-flex boards are different from pure soft boards and hard boards. Conventional soft-board drills have insufficient hardness requirements for soft-rigid boards, while pure hard board drills have insufficient defects for the soft part of soft-hard boards. Therefore, the drilling effect cannot meet the quality requirements of the product. The roughness of the production hole wall is required to be less than 25um, but the actual production of 15% to 20% of the product hole wall roughness will be greater than 25um, and the drilled hole is easy to tear or wrinkle. Product defect rate as high as 30% to 40%

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