Molding Method and Mold

Abstract

In a molding method and a mold therefore, a fluid flows through an ejector pin including a front end surface movable with respect to the mold to release or remove from the mold at least a part of a product made from a melted material so that the front end surface of the ejector pin movable with respect to the mold is cooled by the fluid.

1 . A method for forming a product from a melted material, comprising the steps of
 moving first and second mold parts with respect to each other to contact each other so that a cavity is formed therebetween,   injecting the melted material into the cavity,   solidifying the melted material to form the product,   moving the first and second mold parts with respect to each other to be separated from each other so that the product is capable of being taken out of the cavity, and   moving an ejector pin including a front end surface defining a part of the cavity with respect to a surface of one of the first and second mold parts defining another part of the cavity in such a manner that at least a part of the product is released from the one of the first and second mold parts,   wherein a fluid passes through the ejector pin so that the front end surface is cooled by the fluid during the step of solidifying the melted material.   
   
   
       2 . A method according to  claim 1 , wherein an injecting axis along which the melted material reaching the cavity is oriented crosses the front end surface. 
   
   
       3 . A method according to  claim 1 , wherein the fluid is a gaseous matter. 
   
   
       4 . A method according to  claim 1 , wherein the fluid is enabled to flow between an inside of the ejector pin and an outside of the ejector pin at a part of a longitudinal outer peripheral surface of the ejector pin expanding in a longitudinal direction of the ejector pin. 
   
   
       5 . A method according to  claim 4 , wherein the fluid flows to a portion distant from the part of the longitudinal outer peripheral surface in a flow of the fluid, and a distance between the front end surface and the portion in a movable direction in which the ejector pin is movable with respect to the surface is smaller than a distance between the front end surface and the part of the longitudinal outer peripheral surface in the movable direction. 
   
   
       6 . A method according to  claim 4 , wherein the fluid flows along the longitudinal outer peripheral surface in a space arranged at an outside of the ejector pin. 
   
   
       7 . A method according to  claim 6 , wherein the fluid flows in the space to surround the longitudinal outer peripheral surface as seen in a movable direction in which the ejector pin is movable with respect to the surface. 
   
   
       8 . A method according to  claim 1 , wherein the fluid flows through the fluid path while at least one of the melted material and the product contacts the front end surface. 
   
   
       9 . A method according to  claim 1 , wherein the fluid flows through the fluid path after the product is removed from the front end surface. 
   
   
       10 . A method according to  claim 4 , wherein the fluid flows out from the ejector pin at the part of the longitudinal outer peripheral surface.