在羽毛高尔夫球时代，仅有两种高尔夫球杆被使用，一种是带有大凹杆面的沙铁杆，另一种是杆头很小的。
Only two types of irons were used during the feathery ball era, the sand iron with a large concave face and the rut iron which had a very small head.
在工作过程中，冲头与凹模切口的半径定位，确保形成所需的圆形，而不至于在圆边产生“缺口”。
The radius of the punch and die cutting edges is laid out to produce the desired circular shape without nicking into the circle as the work proceeds.
冷镦圆头凹模是冷镦螺栓生产过程中的关键模具。
Cold upset female die of fillister head is the key mold in the manufacturing process of heading bolt.
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