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Stretch forming principle:upper mould moving down to feeding punch pad , and feeding punch pad cut the material, upper mould keep moving down, first level stretch come true when there has press come out by upper cylinder and lower cylinder. Level one tensile concave die keep moving down, second stretch come true . and then note machine make an sign on the production ; press machine pass the dead point, a roll round space come out , and press keep moving up , the production blow away from the machine under the help of blow device.
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