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我厂在修复安装捷制K849A型二千吨精压机时,发现摩擦离合器气缸大皮碗损坏(见图1),材料为牛皮。如仍采用牛皮制作,很难买到直径近1米、厚度5毫米的整张牛皮,为此,我们决定改用耐油橡胶压制。我们设计了图2所示的皮碗压模,采用丁腈耐油胶(牌号为试5171),一次模压成功,获得了满意的结果。橡胶皮碗的尺寸精度主要靠模具来保证。在模具设计中,胶料收缩率较难选准,根据我们的实践经验,试5171丁腈耐油胶的收缩率选1.5～1.8%较理想。规格尺寸不一的皮碗均可采用此数据,一般外径选用1.8%,内径选用1.5%。
I plant repair and installation of Czech K849A two thousand tons of fine press, found that the friction clutch cylinder big bowl damage (see Figure 1), the material is leather. If still using leather production, it is difficult to buy a full diameter of 1 meter, 5 mm thick piece of leather, therefore, we decided to switch to oil rubber compression. We designed the cup bowl die shown in Figure 2, using nitrile rubber (grade 5171), a successful compression, and obtained satisfactory results. Rubber cup size accuracy mainly by the mold to ensure. In the mold design, rubber shrinkage is more difficult to select accurate, according to our practical experience, try 5171 nitrile rubber shrinkage rate of 1.5 to 1.8% is more desirable. The specifications of the different sizes of cups can use this data, the general selection of 1.8% diameter, 1.5% diameter selection.