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前言近几年来在自动机方面有了进一步的发展,主要表现在生产率的提高.这是显著的特点,围绕这个特点而出现的新结构、新设备、新品种就较多了. 制造标准件工艺过程所需要的装备、设备,不仅仅是采用冷镦机.如,制件带有螺纹,则需滚丝机、搓丝机.行星式(流星式)滚丝机结构简单而效率高(达1000多件/分),有其优越性,但工具难制造,而搓丝机仍大量生产,因其工具简单,易造之故.头部带一字槽的螺钉需用铣口机加工.其效率也提高到2000件/分.另外一方面以十字槽代替一字槽也是发展的必然趋势,这不仅因为容易制造,而且使用
Preface In recent years there has been further development in the automatic machine, mainly in the productivity improvement .This is a significant feature of this feature around the emergence of new structures, new equipment, new varieties are more. The equipment and equipment needed in the process are not limited to the cold heading machine, for example, the thread rolling machine needs a thread rolling machine and a thread rolling machine. The planetary (meteor) rolling machine has a simple structure and high efficiency More than 1000 pieces / min), has its advantages, but the tool is difficult to manufacture, while the rolling machine is still mass-produced, because of its simple tool, easy to make. The head with a slotted screw need to use milling machine processing. The efficiency is also increased to 2000 pieces / min.On the other hand, the cross groove instead of a slot is also an inevitable trend of development, not only because of the ease of manufacture, but also the use of