Laser cladding deformation control method for slender piston rod

Abstract

The invention provides a laser cladding deformation control method for a slender piston rod. The laser cladding deformation control method comprises the following steps of rough turning, wherein the reserved size is larger than or equal to phi(D+n) mm; drilling a hinge hole; hardening and tempering; straightening, wherein the jerk value of the slender piston rod is less than or equal to 1mm; Semi-finish turning, wherein the reserved size is larger than or equal to phi(D+n1) mm; finish turning, specifically, carrying out further finish machining on the outer circle of the slender piston rod bytaking a semi-finish-turned outer circle as a benchmark; high-speed laser cladding, specifically, detecting the jerk value of a sealing surface; size detection, specifically, detecting the diameter ofeach part of the slender piston rod; and carrying out milling-flattening, excircle grinding and polishing in order to complete the laser cladding process of the slender piston rod. The laser claddingdeformation control method for the slender piston rod has the advantages that severe workpiece deformation caused by excessive heat generated in the laser cladding process is avoided, and the processflow and time are saved.

Description

technical field [0001] The invention relates to a preparation process of an underground hydraulic support cylinder in a coal mine, in particular to a method for controlling deformation of a slender piston rod by laser cladding. Background technique [0002] The traditional laser cladding technology adopts the method of preset powder feeding (or side-axis powder feeding), and about 80% of the energy acts on the substrate, so that the local deformation of the slender piston rod (length L / diameter D>6) is greater than 3mm. [0003] The workpiece adopts the traditional laser cladding process as follows: blanking - rough turning - drilling hinged holes - quenching and tempering - straightening - semi-finishing turning - finishing turning - traditional laser cladding - size inspection - Finish turning—milling—grinding outer circle—polishing, even if “straightening” correction measures are taken, “straightening” stress rebound will occur during the processing, resulting in local...

AI Technical Summary

Problems solved by technology

[0003] The workpiece adopts the traditional laser cladding process as follows: blanking - rough turning - drilling hinged holes - quenching and tempering - straightening - semi-finishing turning - finishing turning - traditional laser cladding - size inspection - Finish turning—milling—grinding outer circle—polishing, even if “straightening” correction measures are taken, “straightening” stress rebound will occur during the processing, resulting in local iron leakage and local black skin. The reason is: the amount of powder fed by the preset powder feed or the side shaft powder feed is huge, which generates huge heat during cladding, and about 80% of the energy acts on the base material, resulting in the overall deformation of the piston rod, so a finishing car is required after that In order to control the size within a reasonable range, the last finishing process is disturbed by the deformation caused by stress springback, and it is easy to cause the problem that the local cladding part is too thick, which limits the promotion of this technology. application

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