Method for producing a rubber diaphragm, especially for motor vehicle brakes

A method for producing a rubber diaphragm for a vehicle brake, comprising:

• (a) preparing materials:
• producing, measuring and cutting a first rubber film, a second rubber film and a canvas;
• (b) primary forming:
• putting said first rubber film into a lower mold cavity of a diaphragm mold, covering said film with said canvas, positioning said canvas via a mold ring, switching on a primary upper mold on a vulcanizer, pushing said mold into a center of a hot plate of said vulcanizer, and performing primary forming for 30-40 seconds under a setting temperature of 152-157° C. and holding pressure of 16-18 MPa, automatic opening and exhausting being performed for 3-4 times or vacuum pumping being performed;
• (c) secondary forming and curing:
• taking said primary upper mold out, putting said second rubber film into a mold cavity and switching on a secondary upper mold, pushing said mold into a center of said hot plate, and performing secondary forming and curing for 5-5.5 minutes under a setting temperature of 152-157° C. and holding pressure of 16-18 MPa, automatic opening and exhausting being performed for 3-4 times or vacuum pumping being performed;
• and
• (d) performing mold opening, and then trimming said rubber diaphragm when said rubber diaphragm has cooled.