| 摘要 |
Precise and rapid grinding of punch pins made of extremely hard material is obtained by a process and apparatus wherein a cylindrical punch pin is securely held by a work holder means and moved linearly between grinding means to simultaneously form a plurality of "flats" in the plane of a chord of the pin cross section and to cut the cutting end of the pin. The grinding means may be rotatable wheels positioned in predetermined relationship so that when the punch is moved therebetween, the flats and end will be precisely ground. The work holder means may include a pair of spaced, generally parallel arms clamping the punch pin at spaced points along its length so that opposite sides of the pin may be simultaneously ground and so that one of the grinding wheels may pass between the arms to form a flat. A fluid cylinder operator pivots the arm to effect the clamping action.
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