| 摘要 |
PURPOSE:To contrive not to generate a defect such as a molten material creases or a flow mark or a weld line or defective filling even in thick molding or partly thin molding, by a method wherein a part or the whole of a cavity and core forming a mold is constituted so that the same is moved. CONSTITUTION:The whole of a core 1b is constituted so that the same is moved and a shifting position P2 is held with a spring 3. Then since the whole of the core 1b is at the position P2 at the time of starting of filling of a molding material 2, the filling of the molding material 2 into a mold, which is compara tively small capacity and thin, through a gate 4 is started. The core 1b is pushed down gradually by compressing the spring 3 with filling pressure of the material 2, moved up to the original position P1 through restoration and molding is completed. Since at the time of the starting of the filling of the material, the core 1b is at a moving position P2, mold form is in a suitable state for a mate rial flow or degassing where the filling of the material progresses gradually as the material is filled out smooth into the mold, it is not feared at all that a defect such as a weld line due to defective degassing may be generated by completion of molding. |
