Iron alloy-based composite hard alloy roller and production method thereof

Abstract

The invention discloses an iron alloy-based composite hard alloy roller and a production method thereof. The iron alloy-based composite hard alloy roller is formed by pressing metal powder forming a hard alloy outer ring and metal powder forming an iron alloy inner ring through vacuum pressing and sintering, wherein the hard alloy outer ring consists of 69 to 71 percent of WC, 16 to 18 percent ofCo, 12 to 14 percent of Ni and 0.3 percent of mixed rare-earth powder; and the iron alloy inner ring consists of 20 to 25 percent of TiC, 0.3 percent of Ni, 2.5 to 3.5 percent of Cr, 8.1 to 9.1 percent of W, 0.4 percent of C, 2 to 3 percent of Mo and the balance of Fe. The iron alloy-based composite hard alloy roller has the characteristics of reasonable formula, synchronous vacuum pressing and sintering, energy conservation, solution of iron-based alloy oxidation problem, integrated fusion of diffusion interfaces, safe and reliable combination, high abrasive resistance, good surface quality,high forming precision and good heat cracking resistance and corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of rolls, in particular to an iron alloy-based composite hard alloy roll. Background technique [0002] The successful application of cemented carbide rolls in high-speed wire rod finishing and pre-finishing mills has greatly promoted the development of cemented carbide in other hot rolling fields. Therefore, cemented carbide composite rolls have been developed and applied. Since the early seventies of the twentieth century, cemented carbide has been applied in ordinary wire rolling mills, finishing mills and bar finishing mills. This type of roll was designed in the form of a nested composite roll in the early days, that is, the integral carbide roll ring is set on the steel roll shaft body, and the rolling torque is transmitted through the friction force of the inner hole of the roll ring or the clamping force of the end face. This method relies on an alloy spring to transmit a sufficiently large locking...

AI Technical Summary

Problems solved by technology

[0004] In the early 1980s, the Swedish Sandvik Company proposed the cast-in composite cemented carbide roll scheme, that is, the cemented carbide roll ring and the ductile graphite lining with high toughness were cast together to form a metallurgical combination. The casting type cast iron carbide composite roll has the following problems: the cast-in method composite carbide roll ring has complex process, low yield, long production cycle and high cost

The bonding strength of the metallurgical interface formed at the same time is low, and the interface between the two materials is prone to cracks, which is difficult to transmit large torque

The material selection requirements of the composite inner ring are strict, the versatility is poor, and it requires high technical support and large equipment investment