Abrasion resistant coated process of miniature cutter

Abstract

This invention relates to a process to coat a wear resistance film with thickness of 0.5 - 3um onto miniature machining tools, which can be sintered tungsten carbide or tungsten carbide cermet milling cutters or drill bits with shank diameters <4mm. Its constituent is ZrHfCN with Hf content of 0 - 10 wt%. It has good adhesion strength and can works at higher speed and with longer service life. Actually, it can make service life of tools 1.5 - 3 times long in machining printed circuit boards.

Description

technical field [0001] The present invention involves using the principles of physical vapor deposition (Physical Vapor Deposition, PVD), ion bombardment cleaning and ion-assistant coating (ion-assistant coating) to coat multi-element ultrafine ion particles on the surface of a micro-milling cutter to form a film. Especially a multi-element coating of zirconium (Zr), hafnium (Hf), carbon (C), nitrogen (N) on tungsten carbide sintered superhard alloy (Sintered Tungsten Carbide) or tungsten carbide ceramic gold (Tungsten Carbide Cermet) ) on the micro-drill and milling cutter. Background technique [0002] Micro-sized drills (Drills) and milling cutters (Routers) with a Shank Diameter of 3.175 mm are often installed on drilling machines and milling machines to drill holes on printed circuit board (PCB) substrate materials and Cutting, these substrates are basically made of glass fiber (Glass Fiber), some even add multi-layer copper foil or polytetrafluoroethylene (PTEF), so t...

AI Technical Summary

Problems solved by technology

[0003] The existing cutting tool wear-resistant coating technology is divided into two categories: chemical vapor deposition (Chemical Vapor Deposition, CVD) method and physical vapor deposition method. The former is usually vacuum coated at high temperature, and the process temperature is generally 400 ° C to 1200 ° C Left and right, in order to carry out the film deposition reaction of transition metal nitride (Nitride), carbide (Carbide) or carbonitride (Carbon-nitride), such as disclosed in US Pat. The method is a relatively low-temperature process method, and its temperature range is as high as 400-900 ° C. Although the ZrCN wear-resistant layer can be deposited, because the process temperature is too high, it will cause damage and softening on the tip of the micro-tool. In addition, the reaction used Gases containing metal halides are highly toxic, so there are concerns about public safety and environmental control

[0004] In the physical vapor deposition method, the most important one is sputtering or sputtering (Sputtering) method, and its temperature can be controlled below 400 ° C, such as the carbides and nitrides of some transition metals disclosed in British Patent GB2226334 Or oxide sputtering process, these coatings are limited to metal substrates with Vickers' Hardness less than 300, if the Vickers' Hardness of the substrate is greater than 300, it will cause the coating and Poor adhesion between substrates resulting in poor wear and corrosion properties

Therefore, the sputtering technology with small ion energy is still difficult to apply to the wear-resistant coating of micro-tools

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