Roller applicable to cross wedge rolling shaft type parts and production technology

Abstract

The invention relates to a roller and a production technology, in particular to a roller applicable to cross wedge rolling shaft type parts and a production technology. The roller is prepared from chemical ingredients comprising 1.8-2.2% of C, 0.4-0.60% of Si, 0.8-1.2% of Mn, 0.03% or less of P, 0.025% or less of S, 1.2-1.6% of Cr, 1.6-2.0% of Ni, 0.6-0.8% of Mo, 0.2-0.4% of V, 0.2-0.4% of Nb andthe balance Fe and a small amount of residual elements, then, two-furnace smelting is carried out, yttrium-based rare earth alterant is added, and a special heat treatment technology is carried out, so that the roller is obtained. The phenomenon that carbide exists in a discontinuous (granular) state is changed by optimally allocating the chemical ingredients, particularly adding niobium and vanadium, and the microscopic structure of the roller is improved. Meanwhile, by adding the yttrium-based heavy rare earth alterant for purifying molten steel in the steel melting process, the purity is improved, the comprehensive mechanical property of the roller is improved, the yield and quality of rolled products are improved, the service life of the roller is prolonged, and the purposes of cost decreasing and benefit increasing for enterprises are achieved.

Description

technical field [0001] The invention relates to a roll and a production process, in particular to a roll and a production process suitable for cross-wedge rolling shaft parts. Background technique [0002] With the innovation and rapid development of parts rolling technology, the process of forging such parts is rapidly changed. The cross-wedge rolling shaft parts technology pioneered in my country not only has a rolling output several times higher than that of the die forging method, but also has better quality than the die forging method, and a considerable part of the parts does not need to be cut after rolling, and the material saving reaches 37%, which can replace forging and forging. High level of cutting technology. The working principle of cross wedge rolling has two rolls with wedge-shaped dies, which rotate in the same direction and drive the round rolling stock to rotate. The rolled piece is rolled into stepped shafts of various shapes under the action of the wed...

AI Technical Summary

Problems solved by technology

However, due to factors such as material selection and unreasonable size and shape settings, the existing rolls of cross wedge rolling shafts often show defects such as poor wear resistance, poor pressure toughness, rolling red hardness, and poor thermal fatigue crack resistance. The service life of the roll is not high, the rolling volume is small, and the production cost of the enterprise is increased.

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