Piston sealing piece manufacturing process and piston sealing piece

Abstract

The invention discloses a piston sealing piece manufacturing process, which comprises the following steps of: 1) performing injection molding on a hard polyurethane material in a die to form a first sealing piece, wherein the first sealing piece comprises an annular body and a sealing part connected to the upper part of the annular body; 2) cutting off the sealing part of the first sealing piece formed in the step 1), and only retaining the annular body; and 3) putting the annular body into the die in the step 1), and performing injection molding on a soft polyurethane material in the die to form a second sealing piece, wherein the second sealing piece comprises the annular body formed by performing injection molding on the hard polyurethane material and a sealing part formed by performing injection molding on the soft polyurethane material, and thus obtaining the piston sealing piece. Compared with the prior art, the piston sealing piece manufacturing process has the advantages that: the annular body of the piston sealing piece is made of the hard polyurethane material, and the sealing part is made of the soft polyurethane material, so that the piston sealing piece has a simple structure, and can meet a low-friction requirement on the sealing part and a high anti-squeezing capacity requirement on the annular body and totally accord with the actual working condition requirement.

Description

technical field [0001] The invention relates to the technical field of hydraulic and pneumatic seals, in particular to a manufacturing process of a piston seal and the piston seal. Background technique [0002] The piston seals of the existing hydraulic cylinders are various, which are generally divided into two types: the first type is made of soft polyurethane material, which has the advantage of small frictional resistance but poor extrusion resistance; the second type is made of soft polyurethane material. Made of hard polyurethane material, its advantage lies in its strong extrusion resistance, but its frictional resistance is relatively large. Contents of the invention [0003] The first purpose of the present invention is to provide a manufacturing process for piston seals, to solve the problem that the existing piston seals in the prior art are made of soft polyurethane material and have poor extrusion resistance, while hard polyurethane materials are used. Made o...

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Problems solved by technology

[0003] The first purpose of the present invention is to provide a manufacturing process for piston seals, to solve the problem that the existing piston seals in the prior art are made of soft polyurethane material and have poor extrusion resistance, while hard polyurethane materials are used. Made of polyurethane material, there is a technical problem of high friction resistance

[0004] The second object of the present invention is to provide a piston seal to solve the problem that the existing piston seals in the prior art are made of soft polyurethane material and have poor extrusion resistance, while the piston seal made of hard polyurethane material Cheng, there is a technical problem of defects with large frictional resistance

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