Technology for forging squeeze roller of cement roller press

Abstract

The invention discloses a technology for forging a squeeze roller of a cement roller press. The squeeze roller comprises, by weight, 0.20-0.26% of C, 2.5-2.70% of Mn, 0.60-0.80% of Si, 3.40-3.80% of Cr, 0.10-0.20% of Mo, 0.10-0.20% of Ni, 0.02-0.03% of Ti, 0.005-0.007% of B, and the balance Fe. The forging technology comprises the following steps that firstly, a steel ingot comprising the above materials is heated to the temperature ranging from 1160 DEG C to 1180 DEG C, primary upsetting is carried out on the steel ingot, the steel ingot is drawn out through a WHF method, the height-diameter ratio of the drawn-out steel ingot is controlled within 1.6-1.8, and the total forging ratio is controlled within 2.0-2.2; secondly, the blank obtained in the first step is heated again, the heating temperature ranges from 1140 DEG C to 1160 DEG C, secondary upsetting is carried out on the steel ingot, a wide flat anvil is drawn out to the extreme degree, the forging ratio ranges from 1.5 to 2.0, four times of drawing are carried out, the drawing reduction rate of the first two times is controlled within 12% to 14%, the drawing reduction rate of the later two times is controlled within 24% to 26%, chamfering and rolling are carried out on the squeeze roller, and pressing is carried out; thirdly, heat treatment after forging is carried out.

Description

technical field [0001] The invention relates to the field of forging, in particular to a forging process for extrusion rollers of cement roller presses. Background technique [0002] The popularization and use of roller presses in the domestic cement industry has changed the structure of building material products, and transformed the past products with large size, weight, and high energy consumption into products with high technology content and high added value, thus making my country's cement industry faster. Incorporate into energy-saving, environment-friendly and resource-based development track. [0003] Each roller press has two sets of squeeze roller devices, which are the key components of the entire roller press, and play a very important role in the length of equipment life, ease of use and maintenance, and whether the equipment can be widely used. . Extrusion rollers are divided into two types: integral forging and split structure. The split structure cannot sol...

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

[0009] The Chinese patent application whose publication number is CN101134224A discloses a process method of extrusion roll forging of a large-scale roller press, but it does not disclose the material of the steel it adopts, and those skilled in the art understand that it should adopt the existing extrusion The material of the pressure roller, which only improves the forging process

Since the steel material it uses is not specially designed for extrusion rolls, its performance is still not very satisfactory despite the improvement of the forging process