Manufacturing and cutting method of parts portion, mold, cutting machine and manufacturing device thereof further improving manufacturing efficiency or cutting efficiency of parts portion

The invention provides a manufacturing and cutting method of parts portion, mold, cutting machine and its manufacturing device. The manufacturing method of parts portion comprises the following steps: utilizing a mold to inject and form molten material so as to obtain a first formed product, the first formed product comprising the first forming portion obtained by parts portion connected to the runner portion via the gate portion; configuring the end portion of the runner portion of the first forming portion in the forming chamber of the mold; under the state of configuring the end portion of the runner portion of the first forming portion in the forming chamber of the mold, inject-molding the molten material by utilizing the mold so as to acquire the second formed product in which the second forming portion is connected to the first forming portion of the first formed product; and cutting the gate portion contained by the second formed product off by utilizing a cutting machine. Accordingly, it can further i