ERW Steel Pipe Preheat Deformation Technology

Below is the method of ERW steel pipe preheat deformation:

First, the rational selection. On the mold should be selected for precision messy material deformation of a good micro-deformation of steel, carbide segregation serious die steel should be a reasonable casting and quenching and tempering treatment, the larger and can not be casting mold steel can be solid solution double fine heat treatment. Reasonable choice of heating temperature, control the heating rate, the mold can be used for precision messy slow heating, preheating and other methods of equilibrium heating to reduce the mold heat treatment deformation.

Second, the correct operation of the heat treatment process and a reasonable tempering heat treatment process is to reduce the deformation of a useful tool for precision messy method. Precise messy mold deformation reasons are often messy, but we only need to master the deformation rules, analysis of the causes of their attack, the choice of abnormal methods to avoid the deformation of the mold can be reduced, but also can be controlled.

Third, the precision messy mold carry out pre-heat treatment to eliminate the mechanical processing of the rest of the stress occurred. On the precision messy mold, in the conditions permitting, try to use vacuum hardening and quenching after cryogenic treatment. In ensuring the hardness of the mold under the premise, try to use pre-cooling, grading cooling quenching or quenching process.

Fourth, the mold planning description should be reasonable thickness should not be too poor, the shape should be symmetrical, deformation on the larger mold to master the deformation rules, set aside allowance for large, sophisticated messy mold can be used in combination planning. For some precision messy mold can use pre-heat treatment, aging heat treatment, quenched and tempered nitriding heat treatment to control the accuracy of the mold. In the repair mold sand holes, pores, wear and other defects, the choice of cold welding and other heat affected small repair equipment to avoid the repair process deformation of the attack.