High-strength suspended single hydraulic prop with stainless steel sleeve and sleeve layer composite method

Abstract

The invention discloses a high-strength suspension type single hydraulic prop with a stainless steel sleeve and a sleeve layer compounding method, and relates to the field of cold molding machining. The outer conicity of an inner mold in a combined cold-drawing mold is the same as the inner conicity of a circular-truncated-cone-shaped concave opening, the inner mold is pushed to move towards the small opening end of the circular-truncated-cone-shaped concave opening in the axial direction of the circular-truncated-cone-shaped concave opening to reach a certain position, hole shrinkage is achieved through radial extrusion force of an outer mold to obtain the required mold size, and a plunger with the installed stainless steel sleeve achieves the aims of sizing and compounding through mold inner hole extrusion hole shrinkage; after compounding is completed, the inner mold is pulled to move to the large opening end of the circular-truncated-cone-shaped concave opening, and the inner mold naturally rebounds to the free state to achieve rebounding hole enlargement to break away from the plunger compounded with the stainless steel sleeve to complete demolding; and through once cold-drawing of a reducing mold, compounding of the stainless steel sleeve and the plunger can be achieved, the total wall thickness of the compounded plunger is increased, the hardness of a compounded layer is far larger than that of a plunger body, and the technical problem that in the prior art, a composite workpiece is damaged by secondary extrusion formed by demolding is effectively solved.

Description

technical field [0001] The invention relates to the technical field of cold plastic processing, in particular to a high-strength suspended single hydraulic prop with a stainless steel sleeve and a sleeve layer composite method. Background technique [0002] The suspended single hydraulic prop is a kind of external injection single hydraulic prop. It is the supporting equipment of the high-grade mechanized general mining face and the end support equipment of the fully mechanized mining face. It is suitable for the roof support of the coal mining face. protection, end support of fully mechanized mining face, advance support of roadway excavation. The coating (chrome-plated or zinc-nickel alloy) on the outer surface of the living column of the suspended single hydraulic prop is corroded by acid and alkali plasma in the wet working medium underground, and the seal is worn, which in turn affects the sealing performance of the suspended single hydraulic prop Therefore, after a pe...

AI Technical Summary

Problems solved by technology

In the composite process, because the outer diameter of the piston at the bottom is larger than the outer diameter of the live column that needs to be installed with an anti-corrosion layer, it is not possible to perform through-hole composite processing. In this way, the mold will produce secondary cold processing on the composite workpiece; because the bottom layer of the stainless steel jacket has been squeezed and embedded in the fine thread on the surface of the live cylinder during the first cold drawing and composite, the mold removal process produces The second extrusion will force the fine-tooth inlay thread formed by the first cold drawing to form the second staggered peak and random inlay, which will cause the stainless steel sleeve that has been inlaid to be separated from the live cylinder by the second extension. Lost the tightly bonded mosaic of the first cold draw composite

[0004] Correspondingly, when solving the composite problem between the workpiece and the casing layer in the prior art, there is the technical problem of the above-mentioned secondary extrusion, how to avoid the secondary extrusion during the demoulding process and the tightness during the first cold drawing composite. Destruction of the combined mosaic layer is a technical problem that needs to be solved urgently

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