| 摘要 |
PURPOSE:To permit to fill up a part having thin thickness perfectly with resin by a method wherein the split type resin lens barrel, having a lense pressing spring, is formed by injection forming under the forming pressure of 2,000kg/cm<2> or more. CONSTITUTION:Upon forming, working oil 12a is introduced into tan injection cylinder 10 from a hydraulic pump 12 through a solenoid valve 13 and screw 9 is forwarded to pour metered resin material 14 in front of a heating cylinder 8 into a metal mold 7 whereby a formed piece is obtained. In this case, an injection pressure can be detected by a pressure sensor 11 as a hydraulic pressure while an injection speed can be detected by a speed sensor 15. It is rather effective to employ the forming machine of high injection pressure than to employ the same machine of high injection rate and the pressure of 2,000kg/cm<2> or more is necessary to fill up the part having thin thickness with the resin. |
