Broaching tool and preparation method thereof

Abstract

The invention relates to a broaching tool, which comprises a tool base body and an aluminum-titanium-silicon coating, wherein the surface of the tool base body is coated with the aluminum-titanium-silicon coating. The tool base body is made of alloy and comprises the following components in percentage by weight: 1.3%-2% of C, 4%-5% of Cr, 1.5%-3% of Mo, 4%-6% of V, 8%-12% of W, 7%-9% of Co and thebalance of Fe. The weight percentage of aluminum in the aluminum-titanium-silicon coating is 50%-70%, the weight percentage of titanium is 20%-40%, and the weight percentage of silicon is 5%-15%. Thepreparation method comprises the steps of A, pretreating the tool base body; b, conducting coating deposition, specifically, mounting the pretreated tool base body in a vacuum coating machine, heating to a temperature of 450 DEG C, and adjusting to the vacuum degree to be 5-6*10<-3>Pa; opening an argon flow valve, adjusting the vacuum degree to be 0.1-10Pa, adjusting the ion bombardment voltage to be 200V-1kV negative high voltage, wherein the ion bombardment time is 5-30min, and plasma cleaning is conducted on the surface of the tool base body; then opening a pure titanium target and an N2 flow valve, and depositing a titanium nitride base coat for 15-20 minutes; and then opening an aluminum-titanium-silicon target, adjusting the vacuum degree to be 3-5Pa, adjusting the current to be 150-200A, and depositing the aluminum-titanium-silicon nano composite layer for 20-30 minutes.

Description

technical field [0001] The invention relates to the field of metal tool material preparation, in particular to a material selection for a broach tool and a preparation method thereof. Background technique [0002] The broach is a processing tool used for broaching, which is installed on a special broaching machine for chip removal. There are multiple rows of teeth on the surface of the tool, and the size and shape of each row of teeth increases and changes sequentially from the cutting end to the cutting end. When the broach is broaching, each tooth cuts a certain thickness of metal from the workpiece, and finally obtains the required size and shape. Therefore, broaches are often used in batch and mass production to process round holes, spline holes, keyways, planes and forming surfaces, etc., with high productivity. [0003] In the prior art, broaches are mostly made of traditional S500 smelted high-speed steel. In actual operation practice, the service life of existing ...

AI Technical Summary

Problems solved by technology

In actual operation practice, the service life of existing broaches can only reach 20,000 pieces. At this time, the base of the broach is damaged, resulting in high surface roughness of the workpiece, so the work can only be stopped for tool replacement, and the high frequency of tool replacement will inevitably seriously affect equipment efficiency

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