Gradient-structure hard alloy roll collar and manufacturing process thereof

Abstract

The invention discloses a gradient-structure hard alloy roll collar and a manufacturing process of the gradient-structure hard alloy roll collar. A compositional gradient is formed between a roll collar outer layer and a roll collar core. The roll collar outer layer and the roll collar core respectively contain a hard material, a binding material and / or an additive, wherein the hard materials, the binding materials and / or the additives are different in mass content. The hard materials, the binding materials and / or the additives are mixed in a ball-milling mode into roll collar ball-milling mixed materials. The roll collar ball-milling mixed materials are dried, mixed with wax and then dried again. The roll collar outer layer ball-milling mixed material mixed with the wax and the roll collar core ball-milling mixed material mixed with the wax are laid in a layered mode to be loaded, and are subjected to cold press molding to form a roll collar blank. The roll collar blank is subjected to sintering and dewaxing to become hard alloy, and the hard alloy is subjected to thermal treatment to become the hard alloy roll collar. The surface abrasion resistance of the hard alloy roll collar with the compositional gradient is improved remarkably, the service life of the hard alloy roll collar is prolonged by about 15 percent under the same abrasion condition, production cost is reduced, and practical value and promotional value are obvious.

Description

technical field [0001] The invention relates to a roll ring and its manufacturing process, in particular to a cemented carbide roll ring with a composition gradient and its manufacturing process which is mounted on the roll body when rolling a plate or profile. Background technique [0002] In the production of high-speed wire rods, cemented carbide roll rings have been better applied in wire rod mills and bar mills due to their advantages such as high hardness and good wear resistance. However, the price of cemented carbide roller rings is relatively high, and the investment is large. In particular, the sharp rise in the prices of tungsten and cobalt has doubled the price of cemented carbide roller rings. Compared with the integral roll ring, the composite roll ring can save a lot of cemented carbide raw materials, and the production cost is much lower than that of the integral roll ring. [0003] Gradient composite cemented carbide roll rings are prepared by adopting the ...

AI Technical Summary

Problems solved by technology

[0005]Current carbide roller ring materials mainly include WC / Co cemented carbide, Ti C cemented carbide and steel-bonded cemented carbide, and some of them use cast iron internally. Composite roll rings; however, these roll rings are prone to micro-cracks on the surface of the rolling groove and rapidly expand to cause problems such as roll ring fragmentation. Especially in recent years, the international prices of tungsten and cobalt have soared, and tungsten and cobalt are the main raw materials for production. The price of cemented carbide roller rings has also doubled

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