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一、铸造和锻造活塞的选择 铸造和锻造活塞从制造成本来看,铸造活塞是明显的便宜。在不用锻造活塞就不能满足特性要求时,不惜工本而选择锻造活塞的情况也是有的。 从材质比较看出,锻造材料,有助于增强韧性和热处理效果等,此外,还有助于提高其它性能的重要作用。对于铸造活塞,尽管使用现代化的制造技术,但要做到完全没有铸造陷缺是困难的,它的无损检查方法也很困难,而对于锻造活塞,锻件形状一般比较简单,锻造条件的控制就容易,无损检查也容易,就是发现了缺陷也能把它排除了再供锻造,制造成本虽然提高了,但材料的性能却也得以提高。 因为锻件大约在200℃ 以下时,锻造的强度是比较高的,图1表示了铸、锻材料的高温弯曲疲劳强度,超过350℃
First, casting and forging the choice of piston Casting and forging the piston From the manufacturing point of view, the casting piston is significantly cheaper. In the forging of the piston can not meet the characteristics of the requirements, regardless of the choice of forging the piston and the case is there. From the material comparison shows, forging materials, helps to enhance the toughness and heat treatment effect, in addition, it also helps to improve the important role of other properties. For the cast piston, despite the use of modern manufacturing techniques, it is difficult to achieve a total absence of casting defects, and its non-destructive inspection method is also difficult, while forging pistons, the shape of the forging is generally relatively simple and forging conditions are easy to control , Non-destructive inspection is also easy, that is, found defects can also be excluded for forging, although the manufacturing costs increased, but the material’s performance has also been improved. Forging is about 200 ° C below the forging strength is relatively high, Figure 1 shows the cast, forging materials, high temperature bending fatigue strength, more than 350 ℃