Cylindrical surface hardening and strengthening treatment method for ultra-large piston of large oil press

Abstract

The invention relates to a cylindrical surface hardening and strengthening treatment method for an ultra-large piston of a large oil press, comprising the steps of: (1) cleaning the running surface of an ultra-large working cylinder piston of an oil press, and then mixing micron-scale powder and nanoscale powder, which respectively comprise TiO2, SiO2, graphite and Ae2O2 according to the proportion of 1:1:0.3:0.1, wherein the weight ratio of various materials in the micron-scale powder to the various materials in the nanoscale powder is 4:1; uniformly blending the mixed powder with a methylcellulose solution, and presetting the blended mixed powder on the piston running surface to be strengthened by adopting a spraying method; and forming a uniform coating to be hardened, deepened and strengthened by laser, with the thickness of 0.05-0.15mm; (2) carrying out densely covering type deep-layer hardening and strengthening by using a TFL (Thin Film Laser)-H6000CO2 high-power laser processing machine set with the wide laser beam of 30*2mm and the effective power of 4300-5200W to realize laser hardening and strengthening to reach the effective depth of 2.2-3.0mm and the hardened layer hardness of HRC55-60; and (3) after the treatment of laser deep-layer hardening and strengthening, carrying out ground finish on the running surface of the piston to reach the machine size tolerance and precision of design paper. In the invention, the process is simple and the effect is very obvious.

Description

technical field [0001] The invention relates to a surface hardening and strengthening treatment method for components, in particular to a cylinder surface hardening and strengthening treatment method for a super-large piston of a large hydraulic press. Background technique [0002] At present, in the heavy machinery manufacturing industry, 20,000 to 80,000 tons of large hydraulic presses are manufactured, and only a few countries in the world have this technology and manufacturing capacity. The super large piston of the working cylinder of this kind of large hydraulic press is one of the core devices. The large piston weighing tens of tons in a single piece, especially the super large working cylinder piston weighing over 100 tons, is made of 35CrMo, 42CrMo, 45Mn, etc. Made of medium carbon alloy steel. The maximum diameter of the piston is more than Φ2000mm. Due to the large size and weight of the piston, traditional heat treatment techniques, such as high-frequency surfac...

AI Technical Summary

Problems solved by technology

Fatigue damage, workpiece deformation, surface cracks, coating peeling, peeling and other defects are difficult to overcome, which affect the performance of the piston and cannot reach the design index and performance of the hydraulic press

Moreover, problems such as electroplating's environmental pollution also restrict the manufacturing process.