Production process of rubber diaphragm in automobile brake air chamber

Abstract

The invention relates to a production process of a rubber diaphragm in an automobile brake air chamber and belongs to the technical field of automobile brake systems. The production process comprises the steps of: 1) pre-vulcanizing an upper and a lower rubber layers; and 2) fusing the upper and a lower rubber layers. In the technical scheme, a secondary vulcanization process with the same rubber material formula and the equal vulcanization speed is provided, and by means of the process, the upper and the lower rubber layers of the diaphragm is produced through an extruder die, wherein through the vulcanization process in the equal time, vulcanization status in the upper and the lower rubber layers are completely same, so that the problem, which troubles people for a long time, of over-vulcanization of the lower rubber layer during the vulcanization shaping process can be solved, and the problems that rubber materials in different formula are complex and difficult to distinguish and fuse, which influences bonding strength, are solved. The rubber diaphragm is increased greatly in qualified rate, is effectively controlled in production cost, has excellent high-temperature and low-temperature performances, has excellent anti-aging and anti-fatigue performances, is greatly improved in total performance and service life, and has significant advantages.

Description

Technical field [0001] The invention relates to a production process of a rubber diaphragm of an automobile brake air chamber, and belongs to the technical field of automobile brake systems. Background technique [0002] The air chamber rubber diaphragm is the core component of various medium and heavy vehicle brake components with a load capacity of more than 3 tons, which is related to the safety of the vehicle. The diaphragm is required to withstand high pressures of about 0.8MPa and ensure a service life of more than 1 million times. When the air chamber diaphragm is used, when the car brakes with high air pressure, the air pressure pushes the air chamber diaphragm to push the push rod forward, and finally transmits the driving force to the brake patch in the wheel drum to achieve the purpose of braking. Developed countries such as Europe and the United States all plan to have special standards that have strict requirements on the finished product of the air chamber diaphrag...

AI Technical Summary

Problems solved by technology

[0003] For example, the patent No. 200910249742 is the invention patent "Production process of rubber diaphragm of automobile brake chamber". Although the problem of over-vulcanization of the lower rubber layer has been solved to a certain extent, after the first pre-vulcanization molding, the lower rubber layer and the cloth have been pre-vulcanized into a sparse shape, while the rubber block of the upper mold has not been pre-formed, and the product is easy to Wrinkles, leaking cloth, unable to be evenly centered, resulting in a single side of the diaphragm wall thickness, low pass rate, and the middle mold needs to be turned over with a hinge during the second vulcanization, which is difficult to operate and poor in safety

[0004] For example, the patent No. 201210038464 is the invention patent "production process of rubber diaphragm of automobile brake chamber". Although the step of "diaphragm cloth-bottom adhesive layer bonding and shaping" has solved the problem of diaphragm cloth deviation to a certain extent, due to the difference in vulcanization time between the upper and lower adhesive layers, the product uniformity is poor, and the diaphragm is anti-aging Poor performance, short service life

[0005] Therefore, regardless of the one-time, two-time or more than two-time vulcanization process, there are not only defects in the centering stability of the cloth (nylon cloth skeleton), but also problems such as deviation and wrinkling of the cloth built into the diaphragm. Moreover, most of the mold equipment has a hinge structure, which has a high risk factor for operation. Although some secondary vulcanization processes have improved the neutrality of the cloth, the service life and pass rate of the product are low due to the different vulcanization speeds of the upper and lower rubber layers, and the process is difficult. There are still some limitations

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