Large-scale roller press squeeze roll forging technique

Abstract

The present invention discloses one technological process of forging extrusion roll for large rolling press, and the process of making integral extrusion roll forging includes two upsetting and drawing-out steps. The first upsetting and drawing-out step increases forging ratio and improves the steel ingot structure through making the center of the steel ingot in three way compression stress state, eliminating inside hole type fault and reducing cracks by means of controlling the technological parameters. The second upsetting and drawing-out step controls the forms of inclusions in steel, avoids flaky inclusions and new forging fault and forges to the required product sizes. The technological process has high forging inside quality and facilitates the forging of large extrusion roll.

Description

Technical field: [0001] The invention relates to the technical field of manufacturing grinding equipment in cement production, in particular to a process method of extrusion roll forging of a large-scale roller press. Background technique: [0002] In recent years, with the country's increasing investment in infrastructure, the demand for cement has surged. The equipment responsible for the grinding task in traditional cement production is mainly the barrel mill, whose power consumption accounts for 60-70% of the total power consumption of the factory, and the grinding cost accounts for about 35% of the total cost of cement production, and the efficiency is extremely low. The advent of the roller press in the mid-1980s was a major technological innovation in grinding operations. As a new type of grinding equipment in cement production, compared with traditional barrel mills, its output can be increased by 50%. consumption is reduced by 25%. The popularization and use of ro...

AI Technical Summary

Problems solved by technology

[0005] (2) With the increase of the tonnage of steel ingots, the number and size of metallurgical defects, porosity, gas and inclusions inside them have greatly increased, which makes the internal quality of forgings more unstable.

[0006] (3) The main deformation of the steel ingot is drawn by the WHF method, and the deformation of the center is large, which is not conducive to controlling the shape of the inclusions in the steel. It is easy to form small cavities and cracks around the lamellar inclusions and inclusions in the subsequent cooling process. Affected by stress and hydrogen, it may cause ultrasonic flaw detection to exceed the standard

[0007] (4) The main deformation is completed in one fire, and the lack of self-repair process for tiny cavities and cracks inside the forging is also another reason why the ultrasonic flaw detection of forgings exceeds the standard

[0008] (5) The utilization rate of steel ingots is low and the production organization is difficult