Tungsten carbide roller

Abstract

The invention relates to a tungsten carbide roller. The tungsten carbide roller comprises the following components of: 84.5 to 85.5 percent of WC, 6.8 to 7.5 percent of Co, 6.8 to 7.5 percent of Ni, 0.2 to 0.5 percent of TiC, 0.2 to 0.5 percent of CrC, and 0.1 to 0.3 percent of VC. The mixed raw material powder is molded by an isostatic pressing process, and a roller blank is subjected to vacuum sintering treatment at the temperature of between 1,390 and 1,490 DEG C. Because a mixture of cobalt and nickel elements, titanium carbide, chrome carbide and vanadium carbide of hard alloy phase with extremely good bonding performance is added, the composition of the tungsten carbide roller is improved, and a reasonable internal tissue structure is formed. By reasonably selecting the sintering temperature in the vacuum state, defects of under sintering, over sintering and deformation are avoided, the tungsten carbide roller with good comprehensive performance is obtained, the rolling quantity of single-roll single rolling rings is improved by over two times, workload and expenditure of roller replacement are reduced, the work efficiency of the roller is improved, and the quality of wire products is ensured.

Description

technical field [0001] The invention belongs to the field of steel rolling equipment, and in particular relates to a tungsten carbide roll used in a high-speed wire rod rolling mill with good organizational structure and comprehensive usability. Background technique [0002] The roll is the key tool to make the rolled piece plastically deform and obtain the ideal design shape. The wear resistance of the roll directly affects the surface quality of the wire product and the production rate of the rolling mill. Therefore, in recent years, most of the rolls used in the high-speed wire rolling mills introduced in my country, especially the finishing mills, are imported tungsten carbide rolls. Not only does it cost a lot of foreign exchange every year, but also the price of each roll is very expensive, which virtually increases the production cost. . However, tungsten carbide rolls were developed late in our country, and the production technology of roll manufacturers is relativel...

AI Technical Summary

Problems solved by technology

Therefore, most of the rolls used in the high-speed wire rod mills introduced in my country in recent years, especially the finishing mills, are imported tungsten carbide rolls, which not only cost a lot of foreign exchange every year, but also the price of each roll is very expensive, which virtually increases the production cost.

However, tungsten carbide rolls were developed late in my country, and the production technology of roll manufacturers is relatively backward. The surface quality and internal quality of the rolls produced are poor, and the loose structure leads to poor wear resistance of the rolls, severe wear and high rate of broken rolls. The rolling volume of single roll and single groove is small, which is difficult to meet the requirements of high-speed wire rolling

On the other hand, high-speed wire rod products are developing rapidly. Not only are the speeds getting higher and higher, but the requirements for specification and dimension accuracy are becoming more and more stringent. At the same time, there are more and more varieties, and the strength and hardness of the products are also getting higher and higher. Major bottlenecks affecting product throughput and mill availability

[0003] In addition, the second-generation Morgan high-speed horizontal wire rod finishing mill introduced in China in the last century, due to the lack of sizing and reducing equipment, the tungsten carbide rolls of the finished product and the finished front frame rolling mill undertake the dual functions of plastic deformation and product specification size control. To adapt to the high-speed development of wire rod products, higher requirements are put forward for the wear resistance and crack resistance of tungsten carbide rolls of finished products and finished front stand rolling mills

At present, domestic manufacturers of tungsten carbide rolls only focus on the forming process and isostatic pressure of the rolls, but rarely conduct research on the working conditions and chemical composition of tungsten carbide rolls, so they have not been able to fundamentally solve the problem. Performance problems of tungsten carbide rolls