Production method of steam chest rubber diaphram

Abstract

The production process of rubber diaphragm for steam dome includes the steps of preparing material, the first vulcanizing, the second vulcanizing, etc. Each of the vulcanizing steps has mold cavity temperature of 148 deg.c+/-3 deg.c, pressure of 18 Mpa and pressurized vulcanizing time of 2.5 min, and is performed after vacuumizing and pressurizing for three times. The upper mold for the first vulcanizing and the second vulcanizing has two acting surfaces in the opposite sides and is turned once after each vulcanizing. The present invention has simplified technological process, low production cost and high product quality.

Description

technical field [0001] The invention relates to a manufacturing process of a steam chamber rubber diaphragm in an automobile braking part. Background technique [0002] The rubber diaphragm of the steam chamber is the core part of various medium and heavy-duty vehicle brake components with a load capacity of more than 3 tons, which is related to the driving safety of the vehicle. The rubber diaphragm of the steam chamber is required to withstand high air pressure of about 0.8MPa to ensure a service life of 1 million times. The working environment of the rubber diaphragm in the steam chamber, when the car brakes, a high air pressure of about 0.8MPa is generated. This air pressure pushes the rubber diaphragm in the steam chamber to push the push rod forward, and finally transmits the driving force to the brake patch in the wheel drum to achieve purpose of braking. Therefore, the chamber rubber diaphragm is an essential key part in every car. The SAEJ1450-88 standard of the ...

AI Technical Summary

Problems solved by technology

One-time molding and vulcanization can not solve the problem of centering the canvas which determines the intrinsic quality; the thickness and dimension accuracy of the semi-finished film is high; again, the investment in production equipment is large, and the labor consumption is large.

Therefore, the service life is reduced, the pass rate is reduced, the process is difficult, and the production cost is greatly increased.

Although secondary molding vulcanization has solved the problem of determining the centering of the inner quality canvas, if it is produced in a single mold with a non-vacuum, human-operated ordinary vulcanization press, it is still inefficient, labor-intensive, and has many appearance defects (such as rotten bubbles, Bubbles, lack of material, etc.)

In this way, the production cost is still very high, which is still not conducive to the product's participation in market competition.

[0003] The invention patent of "011265825 Steam Chamber Rubber Diaphragm Manufacturing Process" discloses the method of secondary vulcanization to manufacture the steam chamber rubber diaphragm, but when the upper mold presses the canvas, the canvas will wrinkle and affect the product quality; there are both primary vulcanization and secondary vulcanization The vulcanization upper mold adopts two pairs of molds, and the use efficiency is low

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