| 主权项 |
1. A method for forming a plastic support shell of a sole comprising the following steps:
placing a sheet material into a first mold assembly; softening the sheet material by heating; closing and vacuuming the first mold assembly, and cooling the sheet material down to obtain a plastic semi product which is shaped in the contour of the mold insert, the plastic semi product is a shell which has a protruding main portion and a plurality of hole alignment portions formed on an outer surface and a chamber formed on an inner surface, each of the hole alignment portions including a cutting edge which has a cutting angle less than 45 degrees, and the plastic semi product including a waste edge; putting the plastic semi product into a cutting mold assembly which includes a stationary mold and a movable cutting mold, the stationary mold including a cutting insert which is formed in the shape of the chamber of the plastic semi product, to allow the plastic semi product to fully fit onto the cutting insert, the movable cutting mold including a cutting cavity which has a dimension larger than a dimension of the cutting insert; moving the movable cutting mold toward the stationary mold, the edge of the cutting cavity is only able to come into contact with the cutting edge of the plastic semi product, so that when the movable cutting mold is pressed against the stationary mold to clamp the waste edge of the plastic semi product, the edge of the cutting cavity will cut the plastic semi product by cutting along the cutting edge, and the movable cutting mold will cut off the waste edge, as a result, the waste edge is cut off, and the cutting edge is also cut off to form holes; putting the plastic semi product which has been treated by the previous step into a trimming mold assembly which includes a carrying mold and a pressing mold, the carrying mold including a carrying cavity which is formed in the shape of the plastic semi product so as to allow the plastic semi product to fully fit in the carrying cavity, the carrying mold further including a restricting wall which is located adjacent to the carrying cavity, the restricting wall including a restricting edge and is smaller in area than the plastic semi product, so that the peripheral edge of the plastic semi product will protrude out of the restricting wall after the plastic semi product is placed in the carrying cavity, the pressing mold including a support portion with a support edge and to be placed into the inner surface of the plastic semi product in a manner that the support edge is aligned to the restricting edge of the carrying mold, and the plastic semi product is clamped between the carrying mold and the pressing mold; and using a mechanical arm to trim the plastic semi product obtained from the previous steps by trimming along the support edge and the restricting edge, and obtaining a final product of the plastic support shell of a sole. |
