Surface strengthening method of natural gas reciprocating compressor piston rod

Abstract

The invention provides a surface strengthening method of a natural gas reciprocating compressor piston rod. The method comprises the steps that (1) the thickness of a surface strengthening layer of the piston rod is designed and computed; (2) an adopted laser cladding material, cladding parameters and technique conditions are subjected to technique evaluation test verification; (3) according to the evaluation test conclusions, the surface of the piston rod is subjected to laser cladding, a cladding powder material comprises less than or equal to 0.2% of C, less than or equal to 0.5% of Si, less than or equal to 1.2% of Mn, 17-19% of Cr and 1.5-2.5% of Ni; (4) nondestructive testing is conducted; (5) machining is conducted; and (6) final inspection is conducted and comprises size inspection, precision and roughness inspection, hardness inspection and nondestructive inspection. The strengthening layer, treated through the surface strengthening method, of the piston rod surface is combined with a base material in a metallurgical mode, the strength is high, the hardness value is higher than 52 HRC, the width of a heat affected zone is smaller than 0.8 mm, in addition, the mechanical performance of the base material is not affected, and thus the method is suitable for surface strengthening treatment of the piston rod, can also be used for remanufacturing of waste pistons and is widein application prospects.

Description

technical field [0001] The invention relates to a surface treatment laser cladding technology, in particular to a method for strengthening the surface of a piston rod of a natural gas reciprocating compressor. Background technique [0002] Natural gas reciprocating compressor is one of the key equipment for natural gas exploitation, which is mainly composed of main engine, fuel supply and speed regulation system, engine intake and exhaust system, ignition system, lubrication system, cooling system, starting system, instrument control system, instrument control And safety protection system, gas separation and process pipeline system. The unit uses natural gas as fuel, and the power and compression share a crankshaft and a fuselage to form a complete unit. The piston assembly is the key component of the power transmission of the power end and the compression end of the natural gas compressor. The failure mode of the piston rod is mainly the wear of the packing and the oil wip...

AI Technical Summary

Problems solved by technology

However, due to the pollution caused by the electrochrome plating process to the environment, it is gradually banned or banned by national regulations; and the bonding strength between the coating formed by the thermal spraying process and the substrate is low, which makes the coating easy to fall off and form hard substances, causing scratches on the piston rod, etc.