Efficient precise blanking method for pipe thermal stress prefabrication microcracks

Abstract

An efficient precise blanking method for pipe thermal stress prefabrication microcracks comprises the steps of taking a long pipe, opening V-shaped grooves on every small section along the blanking length, dividing the long pipe into short pipes, then placing a ceramic heating rod in inner holes of the short pipes to heat the short pipes, removing a heating device after heating is finished rapidly, starting a rapid cooling device to rapidly cool parts between the V-shaped grooves of the short pipes to enable the microcracks to be generated at the positions of sharp ends of the V-shaped grooves of the short pipes, and feeding the short pipes with the microcracks into a blanking machine fixing clamp after cooling is finished so as to perform blanking. Blanking is performed after material thermal stress effect and stress concentration effect and the like are utilized to urge the pipes to generate the microcracks. The efficient precise blanking method has the advantages of being high in efficiency, saving materials and good in blanking quality and the like.

Description

technical field [0001] The invention relates to the technical field of blanking of metal pipe materials, in particular to an efficient and precise blanking method for prefabricating micro-cracks in pipe materials under thermal stress. Background technique [0002] The blanking of metal pipe materials widely exists in the material preparation processes such as rollers, bearing rings, and gun barrels of the conveyor chain, and in these blanking processes, the amount of blanking is huge. For example, the chain town of Jinhua, Zhejiang Province produces metal chains every year The length can reach hundreds of millions of meters, and Beijing Bearing Factory needs tens of millions of bearing rings every year. However, the current traditional shearing, sawing, high-energy cutting and other blanking methods have problems such as low material utilization rate, large blanking force, low production efficiency, high energy consumption, and poor section quality, which do not meet the req...

AI Technical Summary

Problems solved by technology

However, the current traditional shearing, sawing, high-energy cutting and other blanking methods have problems such as low material utilization rate, large blanking force, low production efficiency, high energy consumption, and poor section quality, which do not meet the requirements of green manufacturing. Require

[0003] The traditional blanking methods include lathe cutting and sawing. Although these two blanking methods can obtain a flat section, they have disadvantages such as low production efficiency and waste of raw materials.

For this reason, in the subsequent industrial production, punching machines or special pipe shears were widely used for shearing and blanking. However, the common shearing and blanking method has large cutting force and energy consumption, and the accuracy of the section of the pipe is low. , in order to meet the requirements of the next process such as cold extrusion, a process of turning and flattening the section has to be arranged after the ordinary shearing and blanking, which reduces production efficiency, wastes materials and increases production costs

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