齿轮变速箱是机器中经常使用的一个部件。这种箱体以往多半是铸造的,近年来国外已开始改用焊接结构。同铸造的箱体比较,焊接结构可以少用金属,简化制造过程,缩短生产周期,并且可以保持良好的机械性能。这些优点,特别是节约金属,在很大的程度上是符合多快好省的方针的。现在以一种焊接的齿轮变速箱为例,谈谈我们的看法。这个箱体原来是用 Gearboxes are often used in machines. In the past, most of the boxes were cast and in recent years foreign countries have begun to switch to welded structures. Compared with the casting box, welding structure can be less metal, simplifying the manufacturing process, shorten the production cycle, and can maintain good mechanical properties. These advantages, especially the saving of metals, to a large extent in line with the principle of more speed and energy saving. Now take a welded gearbox as an example to talk about our opinion. This box was originally used