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

A new type of material and breaking hammer technology, applied in the field of breaking hammers, can solve the problems of piston hitting end face depression, low core strength, low tensile strength, etc., and achieve the effect of low hardness, increased life and good impact toughness

Inactive Publication Date: 2012-11-28
JIANGSU LIBOSHI MACHINERY
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  • Abstract
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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 i

Method used

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

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Example Embodiment

[0023] Embodiment: A preparation process for a breaker piston includes blank forging 1, normalizing and high temperature tempering 2, machining 3, carburizing and quenching 4, cryogenic treatment 5, low temperature tempering 6, and finishing 7. Rough forging 1 is to pour the new material of the broken hammer into the mold to form the blank of the broken hammer piston, and then change the shape and size of the blank under the action of external force; the broken hammer piston after rough forging is normalized and tempered at high temperature 2 stage, first heat to 500°C, hold for 10 minutes, cool in still air and then heat to 500-650°C, hold for 10 minutes, cool to room temperature, after normalizing and high temperature tempering for 2, there is almost no residual Austrian It provides a good basic structure for quenching, and the hardness of the workpiece after tempering is suitable for subsequent machining 3; machining 3 is cold working at room temperature to change the shape ...

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PUM

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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] ...

Claims

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Application Information

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IPC IPC(8): C22C38/44B23P15/10
Inventor 徐伟伟梁文生张春生
Owner JIANGSU LIBOSHI MACHINERY
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