Abstract:
PROBLEM TO BE SOLVED: To simplify the structure of a valve gate type injection molding machine for manufacturing an annular molded product. SOLUTION: The valve gate type injection molding machine is equipped with a movable mold 22, a fixed mold 21, a nozzle 37, a valve pin 38, a center pin 27 and a drive mechanism in order to mold the annular molded product 41 having a center through-hole 41a. A first center hole 22a extending in an axial direction is formed to the movable mold 22 and the second center hole 21a corresponding to the first center hole 22a is formed to the fixed mold 21 so as to ensure the product cavity 40 of the annular molded product 41 with respect to the movable mold 22. The nozzle 37 is provided to the fixed mold 21 to form the resin supply passage communicating with the second center hole 21a. The valve pin 38 is movable in the resin supply passage between the closing position and opening position of an opening 37b. The center pin 27 is movably arranged in the first center hole 22a and brought into contact with the leading end surface of the valve pin 38. The drive mechanism drives the center pin 27 axially. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To prevent carbonized materials from sticking to a probe, to facilitate the removal of carbonized materials, and to increase wear-resistance. SOLUTION: This probe 2 is incorporated in a runner which continues from the gate part of a die. The distal end part 6 of an approximately conical shape of the probe 2 is arranged in a vicinity of the gate part, and a main body part 4 is brought into contact with a manifold. Then, a resin in the runner is molten by the heating of the body part 5, and the gate part is opened/closed by the heating and the stoppage of the heating of the distal end part 6. Boron calcium carbide is applied on the surfaces of the body part 5, the distal end part 6, a resin flow-out port 10, and a resin flow-in port 8 continuing from the resin flow-out port 10 of the probe 2. The adhesion of carbonized materials to the surface of the probe 2 is prevented from occurring by the hardness, corrosion-resistance, wear-resistance and lubricity of the boron calcium carbide. Thus, carbonized materials can be easily removed, and durability is increased. COPYRIGHT: (C)2004,JPO