原来加工如图1所示的曲形工件,是先由钳工划线,然后在立式铣床上用立铣刀铣削,由于工件的外形复杂,所以单件加工时间很长。后来工人同志改用图2所示的夹具加工,提高生产效率50倍。图2所示的夹具,结构非常简单。用一块方铁,在两端制成工件的外形轮廓,中间开槽,工件装在槽内(一次装 The original processing of the curved workpiece as shown in Figure 1 is first crossed by the fitter and then milling with an end mill on a vertical milling machine. Due to the complex shape of the workpiece, the processing time of the single piece is very long. Later, workers comrades switched to the fixture shown in Figure 2 processing, improve production efficiency 50 times. The fixture shown in Fig. 2 has a very simple structure. With a square iron, made at both ends of the workpiece contour, the middle slotted, the workpiece installed in the tank (a