Novel technique for producing mandrel bar

Abstract

The invention relates to a technique for manufacturing a tube rolling tool of hot rolling seamless steel tube, in particular to a technique for manufacturing a rolling machine mandril of a PQF which belongs to the processing technique of workpiece. The invention provides a novel technique for manufacturing the mandril of a tube rolling; the technical scheme adopted by the technical problem of the invention is as follows: refining a steel ingot-forging and blooming-rolling and shaping-surface rough machining-hardening and tempering processing-fine machining and polishing-surface plating. The technique is characterized in that the rolled mandril has the advantages of smoother surface, less bending degree of a blank as well as a small size tolerance. The technique is characterized in that the basic body of the mandril has a high temperature obdurability and the surface of the mandril has excellent wear-resistance. The technique has the beneficial effects that: the manufacturing technique of the mandril is more reasonable; the potential of a device is fully exerted; the yield rate and the production efficiency are high; the cost is low; the quality of the mandril is excellent; the social benefit is remarkable; besides, the manufacture technique brings broad prospects for manufacturing the mandril of the tube mill.

Description

technical field [0001] The invention relates to a manufacturing process of rolling tools for producing hot-rolled seamless steel pipes, in particular to a manufacturing process of rolling mandrel rods for continuous pipe rolling mills, which belongs to the workpiece processing technology. Background technique [0002] At present, the known rolling mandrel adopts forging molding process. The disadvantage of this process is that the forged mandrel has poor surface finish, deep hammer marks, large ellipticity, large dimensional tolerance, and low production efficiency. , and every time you forge one, cut two heads, which consumes a lot of materials. In addition, the mandrel with a smaller diameter has a larger curvature, which increases the difficulty of straightening. Contents of the invention [0003] The invention provides a new manufacturing process of a pipe rolling mandrel, which not only fully guarantees the performance requirements of the mandrel, but also has high p...

AI Technical Summary

Problems solved by technology

[0002] At present, the known rolling mandrel adopts forging molding process. The disadvantage of this process is that the forged mandrel has poor surface finish, deep hammer marks, large ellipticity, large dimensional tolerance, and low production efficiency. , and each forging one, cut two heads, consume more materials

In addition, the mandrel with a smaller diameter has a larger curvature, which increases the difficulty of straightening