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气缸体循环冷却水(油)道封头见图1,属“球缺形”类封头。工艺步骤通常为落坯料、压形复合进行,因H值较小,不设压边装置。坯料的尺寸按D_p=(8(R+0.5t)(H+0.5t)+C)~(1/2)公式计算,式中C值不小于4倍材料厚度,凭经验选取。公式比较繁琐,且理论计算值并不十分可靠,往往要作多次修正。毛坯直径过大或者过小,都会导致材料上的浪费或产品质量的降低,甚至造成废品,受到不应有的经济损失。所以,对坯料尺寸的选取,一般都要反复试验后才能确定。即使如此,密封效果也不理想,因为其密封区在圆周上为线接触(见图1),油孔封头还得承受每平方厘米3～4公斤力的
Cylinder block cooling water (oil) Road head see Figure 1, a “ball-shaped” type head. Process step is usually billet, pressing compound, because H value is small, no pressure device. Blank size according to D_p = (8 (R + 0.5t) (H + 0.5t) + C) ~ (1/2) formula, where C is not less than 4 times the material thickness, empirically selected. The formula is cumbersome, and the theoretical calculations are not very reliable, often to be amended several times. Blank diameter is too large or too small, will lead to waste of materials or product quality, or even waste, suffered undue economic losses. Therefore, the selection of blank size, usually after repeated tests to determine. Even so, the sealing effect is unsatisfactory because the sealing area is in line contact with the circumference (see Fig. 1), and the oil seal has to withstand a force of 3 to 4 kgf / cm2