美国“国民”(National)机器制造公司生产了一种新系列的高速多工位自动冷镦机(参见图),采用盘料生产金属制件。到目前为止,该系列共有七种规格,其中包括长行程与短行程两类。同规格的短行程比长行程有较高的生产率。例如,5S3型三阴模短行程高速多工位自动冷镦机是该系列最小的规格,生产制件的直径为8毫米、杆长为38毫米,生产 National Machine Manufacturing Corp. manufactures a new line of high-speed, multi-station, automatic cold heading machines (see photo) that use disc stock to produce metal parts. So far, the series has a total of seven specifications, including long-stroke and short-stroke two categories. Short stroke with the specifications than the long stroke has a higher productivity. For example, 5S3 Sanyin short stroke high-speed multi-station automatic cold heading machine is the smallest specifications of the series, the production of parts diameter of 8 mm, rod length of 38 mm, the production