Pulling tsu included type pin mold and its pulling tsu included type pin

摘要

PURPOSE: To reduce the abrasion and outward expansion of a retractable pin and to reduce the time filling a mold cavity with a cover stock and the grinding of a gate mark or the like by providing gates to the terminals of respective upper and lower half molds and providing respective gates in the valves controlling the flow of a fluid entering respective almost spherical mold cavities. CONSTITUTION: By arranging gates 150, 152, 154, 156 to the respective terminals of mold cavities 120, 122, a balancing problem is almost eliminated and the movement of cores 124, 126 is reduced to reduce the abrasion and outward expansion of retractable pins 162 and, by using valves 160', 162', 164', 166' arranged in the respective gates, the flow of a cover stock into the mold cavities is increased to reduce a cover stock filling time and the work quantity grinding gate marks by machining is reduced. Further, by arranging retractable pins 162 in a non-vertical plane 168 so that the pins become vertical to the surfaces of a core and a ball cover, spherical dimples can be formed to the cover.