仪器仪表、电器、汽车和飞机上都使用大量的管状铆钉(图1 a)。在无专用成形机的情况下,一般有两种加工方法:一是在小型车床上旋压管材,在尾座上装上专用压头,压出头形再切断,然后手工去毛刺。压出的零件头部有开裂现象,产品质量低。二是用车削或铣削法切断管坯,手工去毛刺后再到冲床上压形。这两种方法都包含手工操作,劳动强度大,效率低。为了满足生产需要,提高产品质量,提高经济效益,我们改进了成形方法。直径4m m以下的管状铆钉采用冷镦成形工艺,在Z 12—4冷镦机上进行加工。由于切下的管坯两端被压扁(图1 b),为了解决压扁问题,设计了一套校圓冷镦模(图2)。切扁 A large number of tubular rivets are used on instrumentation, appliances, vehicles and aircraft (Figure 1a). In the absence of a special molding machine, there are two general processing methods: First, in a small lathe spinning pipe, tailstock mounted on a dedicated pressure head, head shape and then cut off, and then manually deburring. Extruded parts of the head cracking phenomenon, product quality is low. Second, cut the tube by turning or milling method, go to the punch after manual deburring. Both methods involve manual handling, labor intensive, and inefficient. In order to meet production needs, improve product quality and increase economic efficiency, we have improved the forming method. Tubular rivets up to 4 m in diameter are cold forged and formed on the Z 12-4 cold heading machine. As the cut ends of the tube were crushed (Fig. 1b), a set of round cold heading dies (Fig. 2) was designed to solve the flattening problem. Cut flat