Novel material of piston of breaking hammer and manufacturing process of piston

Abstract

The invention discloses a novel material of a piston of a breaking hammer and a manufacturing process of the piston, belonging to the technical field of breaking hammers. The novel material is 18Cr2Ni4WA and comprises the following chemical components: 0.13-0.19% of carbon C, 0.17-0.37% of silicon Si, 0.30-0.60% of manganese Mn, not more than 0.025% of allowable residual content of sulfur S, not more than 0.025% of allowable residual content of phosphorus P, 1.35-1.65% of chromium Cr, 4.00-4.50% of nickel Ni, not more than 0.025% of allowable residual content of copper Cu, 0.80-1.20% of tungsten W and the balance of iron. The manufacturing process of the piston of the breaking hammer comprises steps of forging, normalizing and high-temperature tempering, machining, carburizing and quenching, subzero treatment, low-temperature tempering and finish machining. The piston of the breaking hammer, which is manufactured according to the method provided by the invention, is high in hardness and has better tensile property and the like than similar products in China; the problems that pistons of breaking hammers available in market are low in hardness and likely to be strained are solved; and the piston manufactured according to the method provided by the invention further has the advantages of low cost and good economical efficiency.

Description

[technical field] [0001] The invention relates to the technical field of breaking hammers, in particular to a novel material and manufacturing process for manufacturing a breaking hammer piston. [Background technique] [0002] The hydraulic breaker belongs to a new type of high-efficiency hydraulic impact vibration machine tool. It is a supporting working part of the excavator or loader. Hit the drill rod to do work externally. [0003] Among them, the piston is the key part of the breaker. The piston of the breaker has a continuous high-speed relative reciprocating movement with the cylinder during work. There is severe friction between the reciprocating movements, and the lower end face frequently hits the drill rod to withstand the impact stress. Therefore, the quality of the design and manufacture of the breaker piston directly affects the reliability and life of the breaker, and the work reliability and life are closely related to the material of the piston. [0004] ...

AI Technical Summary

Problems solved by technology

[0004] In recent years, due to the introduction of breaking hammer technology from Japan and South Korea, SNCM616V and SNCM26V from Japan or South Korea are generally used as the piston material of the breaking hammer, especially the latter (these two materials have no corresponding domestic material grades), but Because it is an imported material and the price is high, the selection is subject to certain restrictions, so it is necessary to find a more suitable and economical piston material

[0005] In addition, at present, the pistons of breaking hammers are mostly made of low-carbon alloy carburizing steel and medium-carbon alloy carburizing steel, which have the disadvantages of low tensile strength and low core strength after material heat treatment. Under the action, the piston is prone to concavity on the end face and upsetting at the end

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