| 摘要 |
A method and apparatus are used to improve upon injection molding of a part. The method includes injecting a molten plastic material (10A) into a mold (30) having a mold cavity (32) and moving an insert (40) into the mold cavity (32) consisting of mold halves (34 and 44) to affect the structure of the part. The structure may be so affected by forming holes within the structure, densifying the material around the holes, densifying the material at a particular cross section, thinning out cross sections of the part to be molded, forming bosses out of walls of the part to be molded without causing sink marks, and forming living hinges joining thickened cross-sectional portions of an integrally manufactured plastic part. An apparatus utilizes insert pin (40) and support pin (46) actuated by camming surfaces and pistons to carry out the improved methods. |
