| 摘要 |
Holes are produced by a punch(1) whose heated cutting edges(6,7,8) are warmer than the material of the plastic part(3) being cut. Heating is controled according to the material being cut and gives a heating edge temperature of 50-85degreesC. Punching speed and/or force are variable. The cutting edges(6,7,8) pass through the plastic(3) and at the end of the punching stage just contact a supporting surface(10) below the full area of the material in the cutting area. During punching the area around the cutting edge becomes partly molten and the punched-out section is displaced into a recess(16) in the end face of the punch though remains attached to the plastic part from which it can be pushed out. Independent claims are included for: a) a punch incorporating a heater(9) for the cutting edges; b) a complete punching unit including the claimed punch with a controllable heating system for the cutting edges of one or more punches.
|
