| 摘要 |
PURPOSE:To suppress the amount of deformation of an insert by inclining the insert itself and/or setting an edge dam on the mold in such a way that the injecting pressure of a raw material is only applied on one side of the insert and by supporting the part of the insert being floated from the mold by means of supporting parts from the side of the insert where the injecting pressure of the material is not being applied. CONSTITUTION:An edge dam 15 and supporting pins 17 are set on a bottom force 7. The edge dam 15 has a fan-shaped cross-section whose curved surface is faced in the flow direction of a material and have about the same height as that of the edge of an insert 5 at the material injection side. 8 penetrating holes 21 are formed on the edge part of the insert 5 and the material can be thereby easily reached the back side of the insert 5. When the material is injected in a cavity 13, the flow is concentrated on the upper side of the insert 5 as shown by arrow marks by means of the edge drum 15. The part A of the insert 5 faced to the material injecting side is not thereby pressed by the total pressure of the material flow. If the insert is deformed by the static pressure of the material flow, the amount of deformation is small and is not detectable in its appearance as it is being supported from the lower side by means of the supporting pins 17. |
