| 摘要 |
In producing a forming tool such as an injection moulding tool, a casting model 21 is made by making a forming structure portion 22, e.g. by stereolithography or laminated object manufacture, and connecting it in a separable manner to a bolster portion 23, e.g. made of rigid foam. A casting mould is formed by ramming moulding sand 49 against the model 21. The bolster portion 23 (re-usable) is removed from the casting mould before the other portion 22 (re-usable or exchangeable). A tool blank is cast in the mould and at least its forming structure (cavity-defining surfaces) is machined to the required dimensions, e.g. by electric discharge machining. <IMAGE> |
