| 摘要 |
PROBLEM TO BE SOLVED: To suppress the adverse effect by a weld by the rotation of an insert work itself by stirring the resin in a cavity by rotating the insert work at the time of injection filling with the resin and stopping the insert work before the resin is solidified to insert the same into the resin at a predetermined position. SOLUTION: An electromotor 17 is operated during a period when the interior of a resin 19 has flowability and the rotatory power thereof is transmitted to a rotary pin 10 through a spline 12 and the insert work 7a fitted to the leading end thereof is rotated together with the rotary pin 10. This rotation is performed after the resin 19 is injected but may be started from a point of time immediately before the injection of the resin 19 according to circumstances and the resin at the part coming into contact with the insert work 7a is pulled by the side surface of the work by the rotation to be stirred. This stirring region is expanded by the increase in viscosity accompanied by the cooling of the resin 19 and the boundary of the resin by confluence is disturbed and a weld is erased. The rotation of the insert work 7a is stopped before the internal resin is solidified. |
