Machining method of supporting sleeve and supporting sleeve

Abstract

The invention discloses a machining method of a supporting sleeve and the supporting sleeve. The machining method of the supporting sleeve comprises the following steps of (1) machining a supporting sleeve base body and an annular check ring; 2) fixing the annular check ring on an annular table, so that an annular cavity is formed between the annular check ring and the supporting sleeve base body;3) melting a copper alloy or a copper material into the annular cavity to form a copper sleeve blank in the annular cavity; 4) machining to form a supporting sleeve semi-finished product; 5) nitriding treatment; and 6) finish machining. According to the machining method, copper alloy or copper materials are placed in the annular cavity or on the upper portion of the annular cavity in the step (3), then the supporting sleeve base body containing the copper alloy or the copper materials is placed in a sintering furnace to be sintered, the supporting sleeve comprises the supporting sleeve base body and a copper sleeve, and the supporting sleeve is machined through the machining method of the supporting sleeve; and machining is convenient, the bonding strength between the copper sleeve and the supporting sleeve base body is improved, the copper sleeve is not prone to loosening, collision between a piston and a cylinder body is avoided, the service life of a breaking hammer is prolonged, and the machining cost of the supporting sleeve is reduced.

Description

technical field [0001] The invention relates to a processing method of a support sleeve and the support sleeve, belonging to the technical field of mechanical processing. Background technique [0002] The breaker is an important working tool of the hydraulic excavator. It is a machine tool that can convert hydraulic energy into mechanical energy to do work externally. It uses hydrostatic pressure as the power to drive the internal piston to reciprocate. When the piston strokes, it hits the drill at high speed. The rod is used to crush ore, concrete and other solids by the drill rod, and is used for crushing, demolition and other work. [0003] In order to meet the installation of the piston of the breaker and avoid hydraulic oil leakage, an oil seal holder is set between the upper cylinder of the breaker and the piston, such as figure 1 and figure 2 Shown is an existing one-piece oil seal holder structure, the lower part of the oil seal holder has an annular part for buff...

AI Technical Summary

Problems solved by technology

[0006] The copper sleeve on the existing support sleeve is processed by cold packing. Specifically, the copper sleeve is frozen to shrink the copper sleeve by 0.1-0.4mm, and then put into the support sleeve, and the copper sleeve expands by thermal expansion and cold contraction. Interference fit with the support sleeve, in order to ensure that the expansion of the copper sleeve can be closely matched with the support sleeve, the thickness of the copper sleeve is relatively large, generally the thickness of the copper sleeve is 5mm-10mm, which increases the processing cost of the support sleeve; The bonding strength between the sleeve and the support sleeve is often insufficient. During the high-speed movement of the piston, the copper sleeve is easy to loosen and separate from the support sleeve, causing the copper sleeve and the piston to lock up. In addition, the thermal expansion coefficient of steel is smaller than that of copper. In addition, the larger the thickness of copper, the larger the expansion will be, which will affect the fit gap between the copper sleeve and the piston, which cannot meet the requirements of the fit gap between the copper sleeve and the piston, will hinder the movement of the piston, and seriously affect the crushing. Working efficiency and service life of the hammer

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