Supersonic Spraying Technology of Roll Passes Made of Semi-steel

Abstract

The invention discloses a supersonic spray process for a shaped roll pass made of semisteel, which comprises the following steps: 1) carrying out pretreatment on the working surface of the roll pass; 2) carrying out shot blasting on the working surface of the roll pass; 3) carrying out supersonic spray on the working surface of the roll pass; and 4) carrying out hole sealing treatment on a coating. The supersonic spray process disclosed by the invention has the advantages that 1, by using a JP5000-type supersound flame spraying system, the flying speed of melting powder is greater than 720 m / s, the property of the coating is excellent, and the surface of the coating is dense, so that the surface quality of products is greatly improved; 2, the tungsten carbide metal composite powder coating is good in wear resistance and heat resistance, so that for insufficiently cooled shaped lower rolls, the steel bonding caused by frictional wear and the roll marks caused by adhesive wear are avoided, thereby reducing the accident loss due to poor quality; and 3, the wear resistance of the roll pass is increased, the steel passing quantity of the roll pass is increased, the roll loss is reduced, and the service life of a semi-steel shaped roll is prolonged.

Description

technical field [0001] The invention relates to a supersonic spraying process for semi-steel section steel roll passes. Background technique [0002] Semi-steel section steel rolls have poor heat resistance and have high requirements for cooling water, while rolled angle steel and channel steel generally enter the finished hole with the top angle facing upwards, and the bottom of the hole groove is covered by the rolled piece, so cooling water is difficult to enter. The results are: first, hot cracks are easy to form, and second, local adhesive wear occurs. Especially when rolling small-sized products, the rolling piece is long, and the cooling of the lower roll is not good, often resulting in local adhesive wear or abrasive wear, which causes the finished product to have steel sticking or rolling mark defects and has to be replaced in advance, reducing the excessive pass. Steel quantity, sometimes these defects are not discovered in time, which will lead to batch waste, an...

AI Technical Summary

Problems solved by technology

[0002] Semi-steel section steel rolls have poor heat resistance and have high requirements for cooling water, while rolled angle steel and channel steel generally enter the finished hole with the top angle upward, and the bottom of the hole groove is covered by the rolled piece, so cooling water is difficult to enter. The results are: first, thermal cracks are easy to form, and second, local adhesive wear occurs

Especially when rolling small-size products, the rolling piece is long, and the cooling of the lower roll is not good, often resulting in local adhesive wear or abrasive wear, which causes the finished product to have steel sticking or rolling mark defects and has to be replaced in advance, reducing the passover. Steel quantity, sometimes these defects are not discovered in time, which will lead to batch waste products, and the flow of defective steel products to the market will also cause quality objections and bring losses to the enterprise

In order to improve the wear resistance of semi-steel steel roll pass, laser cladding was tried, but new problems occurred: 1. Laser cladding marks affect the surface quality of finished products; 2. The remaining coating after pass use makes the roll Heavy vehicles are very difficult