Abrasion form of PCBN insert,its reason and precaution

Abrasion form of PCBN insert,its reason and precaution

² Crater abrasion

Hardness of the workpiece is too soft; cut speed is too fast; chemical use and diffusion abrasion of carbide insertss or ceramic tool; reduce shear using coolant.

² Pressure surface abrasion

Cutting speed too fast; feed rate is too large; after the tool angle is too small increases cutting speed and feed rate; after increasing angle.

² abrasion border

Main angle is too large; feed rate is too large; shear rate is too small to reduced entry angle; reduced feed rate; increasing shear rate.

² Fracture and abrasion

System rigidity difference; small sharp knife; feed rate and cutting speed is too large; crisp edge tool to improve the rigidity of the system, increasing the knife sharp corners; reduce the feed rate and cutting speed and the use of negative chamfer tool.

² PCBN layer rupture

System rigidity difference; workpiece impact too; PCBN layer is too thin, too brittle tool edge technology to improve system rigidity; surface pre-machining and chamfering; uses thick PCBN layer; using negative chamfer tool.

² PCBN tool grinding

Ceramic bond diamond wheel combined with a common feature of diamond and ceramic binder, with strong grinding, grinding temperature is relatively low, abrasive abrasion is relatively small; it can adapt to the role of various coolant; grinding abrasive shape to keep good, high precision grind the workpiece; there are more pores within the abrasive, it is conducive to chip and heat when grinding, clogging, easy to burn the workpiece; self-sharpening abrasive better, dressing interval long, relatively easy to repair and so on.

Choose reasonable parameters, vitrified bond diamond wheel grinding PCBN inserts, since the binder resin is relatively soft, easily deformed grinding, can not effectively grinding PCBN inserts; metal bonded abrasive binding capacity due to too strong self-sharpening abrasive leaving poor grinding efficiency is low, and metal bonded grinding wheel will cause PCBN inserts edge generated the most serious damage; processing quality integrated grinding efficiency, durability and the abrasive surface of the workpiece, vitrified bond PCBN tool grinding diamond wheel is the ideal choice.

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