How to prevent quenching deformation in the processing of mud pump cylinder liner

During the operation of the oil drilling mud pump, the mud pump cylinder sleeve is subject to the abrasion of sand particles and the corrosive medium in the high-speed flowing mud, which is prone to strain, groove, spalling, leakage, de-cylinder and crushing. In order to improve the anti-wear and corrosion resistance of the cylinder liner, the company is now formed of Cr26 high-chromium cast iron material. The blank is quenched and tempered after annealing and machining, and the hardness is required to be greater than HRC62. However, due to the thin wall of the cylinder liner (6=5.5mill, 7 illm), 100% of the heat treatment has different degrees of deformation, which can not meet the assembly requirements, and the shaping process must be added, which not only increases the process cost, but also the partial cylinder sleeve is over-plasticized. Cracking and scrapping. The following methods can be used to prevent quenching deformation of the mud pump cylinder liner:

A: oil mud pump cylinder liner to prevent quenching deformation, should try to take a lower heating temperature (980 ° C), slower cooling rate (air cooling), when the required hardness HRC> 60, using Cr26 high chromium cast iron material to meet the above The process has a CrC ratio of 8.9 to 9.6.

Second: to prevent the structure, shape and heat dissipation conditions of the basket from affecting the workpiece. The workpiece should be moved away from the basket as soon as possible to disperse the air and cool, but to avoid deformation caused by clamping under high temperature, it is necessary to control the temperature range of the workpiece moving away from the basket. Due to the repeated heating and cooling of the basket, the welded beam supported on the bottom plate of the basket will be deformed. Therefore, the flatness of the edge of the supporting beam should be regularly checked and kept within the tolerance range by the process.