Preparation technique of automobile brake steam chamber separator

Abstract

The invention is a process for manufacturing the steam dome diaphragm of an automobile brake, which includes the steps of measuring and cutting the raw materials of film and canvas; conducting first shaping on a vulcanizing machine using a steam dome diaphragm mold; putting the film and the canvas into a lower mold cavity during the shaping; closing up a ferrule locating canvas and then an upper shaping diaphragm; pushing the film and the canvas into the hotplate center of the vulcanizing machine; keeping the pressure and shaping for 30 to 40 seconds at the set temperature ranging from 152 to 157 DEG C for first shaping and under the pressure of 16 to 18MPa; carrying out automatic gas emission or vacuumizing according to different vulcanizing machines; dismantling the upper diaphragm after the first shaping; putting a second film into the mold cavity and closing the vulcanized upper diaphragm through the second shaping; pushing the mold into the hotplate center of the vulcanizing machine again for the second shaping and vulcanizing at the same set temperature and under the same pressure for 5 to 5.5 minutes; and finally stripping the mold, and cooling and trimming the diaphragm. Compared with prior art, the process has higher adhesiveness and burst strength, improves the quality and service life of the product, changes wearing parts into permanent parts, enhances productivity and reduces production cost.

Description

Technical field [0001] The invention relates to a preparation process of a steam chamber rubber diaphragm in an automobile brake component. Background technique [0002] The rubber diaphragm of the steam chamber is the core part of various heavy-duty automobile brake parts with a load of more than 3 tons. It is related to the safety of the car. The car has a high air pressure of about 0.8Mpa when braking. This air pressure pushes the rubber diaphragm of the steam chamber. Then push the push rod forward, and finally transfer the driving force to the brake patch in the wheel hub to achieve the purpose of braking. Therefore, the rubber diaphragm of the steam chamber is an indispensable key part in the car. Because of this, the rubber diaphragm of the steam chamber is The finished product requirements have strict requirements whether it is domestic or international or the SAE.J1450-1995 standards of the American Automobile Engineering Association. For example: bench life test, produc...

AI Technical Summary

Problems solved by technology

For example, one-time vulcanization cannot solve the key problem of product canvas eccentricity; secondly, it is impossible to produce diaphragm products with a circumferential slope angle of ≤20° and a depth of ≥40mm. When the angle is ≤20° and the depth is ≥40mm, it is easy to produce product edges The phenomenon of cloth leakage makes the canvas not centered, which affects the internal quality of the product, reduces the service life, and cannot guarantee the service life of 1 million times; the third equipment requires a large investment and a large calender, so it cannot meet the current development needs of the automotive industry

The secondary vulcanization process is the "Manufacturing Process of Steam Chamber Rubber Diaphragm" which the applicant has applied for and obtained the patent right. The authorized announcement number is CN1160178C. The small angle is a problem, but the adhesion effect on the product is very unsatisfactory, especially the adhesion between the canvas and the second vulcanized film is poor, and delamination occurs inside the product during the high and low temperature durability test. The first vulcanization time is too long, up to 4 to 4.5 minutes, so that the first vulcanized rubber sheet is scalded, causing degumming and easy damage, reducing the adhesive force, resulting in poor high and low temperature durability of the brake, and at the same time, the sealing performance is also poor. The subsequent decline will cause the brakes to fail. At the same time, due to the long vulcanization time, the productivity will be reduced, the production cost will be increased, and there will be no market competitive advantage.