JPS60500261A - Single-layer wear-resistant coating for metal cutting tools - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Ring-resistant, abrasion-resistant coating for metal cutting tools Technical field FIELD OF THE INVENTION This invention relates generally to metal cutting, and more particularly to single layer wear resistant coatings for metal cutting tools. Ru.

Background technology One of the main directions in modern metal cutting is through the improvement of the chemical composition of metal cutting tools. The improvement lies in the performance characteristics of the wear-resistant coatings of these tools.

Conventionally, it is a substantial compound of hafnium and an element selected from the group of C, N, and O. Single layer abrasion resistant coatings are known (US Pat. No. 4.1.69,913 CJ!). , 428-217, 1979).

However, the high mass of hafnium ions makes the coating practically superhard (c element, = d carbide) Applicable only to metal cutting tools.

Another conventional metal cutting tool single-layer wear-resistant coating (U.S. Pat. No. 4.264 , No. 682, CM 428-: 336, 1981) is carbon and/or nitrogen. It is a solid solution of a compound of two transition metals of group III and group III (one of which is hafnium). is known.

The coating may form some compounds with carbon and/or nitrogen as well as other Group II transition metals. Contains titanium.

However, Hikohara found that the coating had a relatively high level of 2 Characterized by inherent free energy, the interaction between the material being machined and the coating is This can lead to corrosion and have a negative effect on the abrasion resistance of the coating.

Disclosure of invention The first object of the present invention is to use some solid solutions of nitrogen and/or charcoal to provide the coating with wear resistance. Forms of compounds with nitrogen and/or carbon that have hafni ram as a compound with the element To provide a single-layer wear-resistant coating for metal cutting tools containing Group II transition metals. be.

The above purpose is to prepare two Group I transition metals, one of which is hafnium, and carbon and/or carbon. or in a single-layer wear-resistant coating for metal cutting tools that is a solid solution of nitrogen compounds; In the present invention, the single-layer wear-resistant coating of the metal cutting tool combines zirconium with other group This is achieved by including the transition metal in the form of a compound with carbon and/or nitrogen. It will be done.

The present invention is a means of reducing the level of intrinsic free energy of the coating; increases wear resistance.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A single layer wear resistant coating is applied to a metal cutting tool as follows. 0 applied to sea urchin A metal cutting tool made from the tool alloy used up to now was placed under vacuum and Evaporate and ionize the nium and zirconium. Next, prepare the base metal of the tool. The machined surface is heated and cleaned by colliding with zircon and no-funium. Next Add carbon and/or nitrogen to the... to react with hunium and zirconium and their Form a solid solution of the compound. The solid solution forms a single layer wear-resistant coating on the tool surface. .

Examples of actual embodiments are provided below to provide a better understanding of the invention.

Example 1 Ingredients below Pre-cleaned diameter 0.5 made of CMn Si Cr W V Mo Fe steel 20 wn drills were placed in a specific container, and zirconium and hafnium were placed in the tube part. The empty cathode is placed in a vacuum chamber in which it is also placed. Next 1.33 Reduce the pressure inside the chamber to a pressure of X10 Pa, and zirconium and nohefnium evaporate. Apply an electric arc so that it emits and ionizes.

A negative voltage is applied to accelerate the positively charged zirconium and hafniuno ions. The drilled surface is then cleaned and preheated to preheat the base metal of the two tools. Collision with ions of the metal. Next, reduce the voltage applied to the drill and remove the nitrogen. placed in an empty chamber and reacted with hafnium and zirconium, resulting in the Forms a single layer wear-resistant coating on the machined surface of the tool. The coating consists of nitrogen, hafnium, and zirconium. Consists of a solid solution of conium compounds.

The film thus obtained was coated with the following components: At-5, Ti, and the remainder was titanium. The following cutting conditions were applied to the aluminum alloy.

S = 0.0 8 van/rotation V=7.5 m/min Here, S is the drill supply speed into the titanium alloy to be machined, and ■ is the drill rotation speed. coolant (10% aqueous emulsion) in an upright drill press at a rolling speed of For wear resistance (durability) by providing sufficient supply of tested.

When a drill starts to make a metallic sound, it is assumed that it has become dull. The test results will not be published. We found that the lifespan of the membrane increased from 8 minutes to 24 minutes on average compared to a drill that drilled the coating steadily. Indicated.

Example 2 A drill with a single layer wear resistant coating as described in Example 1 was used. against drill A small amount of acetylene is introduced into the vacuum chamber at the same time as the voltage drops, resulting in carbon Acetylene reacts with hafnium and zirconium, forming carbon with hafnium and A coating made of a solid solution of zirconia is formed on the drill surface.

The coating was tested for abrasion resistance as in Example 1.

Test results show that drills last an average of 8 minutes to 30 minutes compared to uncoated drills. It was shown that the amount increases.

Example 3 A drill with a single layer wear-resistant coating as described in "Examples" was used. applied to drill At the same time, a mixture of acetylene and nitrogen is passed through the vacuum chamber. Carbon and nitrogen react with hafnium and zirconium, and nitrogen and carbon react with hafnium and zirconium. A coating consisting of a zirconium compound and a zirconium compound is formed on the machined surface of the drill.

The coating was tested for abrasion resistance as in Example 1.

The test results showed that coated drills lasted 8 minutes to 35 minutes compared to uncoated drills. It was shown that the amount increases with time.

The present invention improves the performance of various workpieces operating under friction, high temperature, high pressure or corrosive media. Possibility of application in an industry that can also be used for The present invention is suitable for machining of structural or difficult-to-cut materials, especially machining of titanium base metals. It is applicable.

Claims (1)

[Claims] Two Group III transition metals, one of which is hafnium, and one of carbon and/or nitrogen. In a single-layer wear-resistant coating for a metal cutting tool that is a solid solution of a compound, the metal cutting Single-layer wear-resistant coatings on cutting tools combine zirconium with other Group II transition metals such as carbon and / or single layer resistance of metal cutting tools characterized by containing it in the form of a compound with nitrogen. Abrasive coating.