Production process of special straightening roll for imported two-roll straightening machine

Abstract

The invention discloses a production process of a special straightening roll for an imported two-roll straightening machine. The production process comprises the following steps: step 1: adopting Cr12MoV as a material of the straightening roll, and performing a blank precision casting process and a slow cooling process, wherein degree of finish of the surface of a precision casting mould is 25-30 [mu]s; step 2: performing forging on the blank with a forging ratio of 3-4; heating the forged blank to a temperature of 1200-1250 DEG C within 4-6 hours, preserving the heat for 12-48 hours, discharging the blank, and performing forging and preliminary forming at a temperature of 1100-1200 DEG C; step 3: performing softening annealing treatment on forged and formed blank, and ensuring the outline dimension to reach the approximate dimension of a curve of the straightening roll; and step 4: performing thermal treatment on the processed straightening roll: performing vacuum quenching on the straightening roll, naturally cooling in a sealed space until the indoor temperature is reached.

Description

technical field [0001] The invention relates to a two-roll straightening machine, in particular to a special straightening roll production process for an imported two-roll straightening machine. Background technique [0002] For domestic special steel bar production enterprises, a large number of advanced automatic continuous flaw detection production lines have been introduced to meet the needs of users for zero-defect delivery. A large number of advanced high-precision flaw detection and high-precision straightening technologies have been mastered by a few developed countries such as the United States and Germany, resulting in high operating costs for fully automatic continuous flaw detection production lines, and some designs are not consistent with the variety structure we actually developed. The imported equipment is not easy to control, and the practicability is poor. In recent years, with the wide application of high-precision straightening equipment, it is very urge...

AI Technical Summary

Problems solved by technology

A large number of advanced high-precision flaw detection and high-precision straightening technologies have been mastered by a few developed countries such as the United States and Germany, resulting in high operating costs for fully automatic continuous flaw detection production lines, and some designs are not consistent with the variety structure we actually developed. Causes imported equipment to be difficult to control and poor in practicability

In recent years, with the wide application of high-precision straightening equipment, it is very urgent to develop and research the special straightening rollers with the largest consumption; the “special high-strength straightening rollers” ", the manufacturing process is complex, the import purchase price is expensive, and the purchase cycle is very long, which seriously affects the normal production of steel mills and the market competitiveness of flaw detection products;

[0003] Due to the long procurement cycle, high price and high consumption of straightening rollers, the supply of imported straightening rollers is often not timely, and the straightening rollers that should have reached the end of their life cycle continue to be used, resulting in uncontrolled straightening quality and The consumption of rollers is very high, generally 60 yuan / ton for small and medium specifications. Domestic special steel enterprises have also tried domestic development and application, but due to the selection of materials and insufficient research on heat treatment, the service life is very low. Generally, the service life of imported straightening rollers is limited. 25 to 40%, and the hardness of the straightening roller surface is not uniform, resulting in the bending of the straightened steel not meeting the requirements of the flaw detection unit, resulting in unqualified batches of flaw detection, and sometimes even damage to the flaw detection unit. , equipment safety and other aspects restrict the development and application of special straightening rollers for imported two-roller straightening machines