Patent DE-102009031604-A1 (DE)
Title: Sand casting tool for producing sand casting product, comprises first and second molded parts, which are movable relative to each other in direction to Z-axis and have first and second mold recesses, and nozzle- and/or smooth pressing unit
Inventor: HERZOG IVO
IPC: B22C11/00
Filed: 2009-07-07
Abstract: The sand casting tool for the production of sand casting products, comprises first (14) and second molded parts (24), which are movable relative to each other in a direction to Z-axis and have first (14a) and second mold recesses (24a) that partially define the shape of the sand casting product to be produced, a nozzle unit and/or a smooth pressing unit, which is arranged at the side of the first molded part turned away from the first mold recess and is moved relative to the first molded part in the direction of the Z-axis, and an ejector (30) arranged to the first molded part. The sand casting tool for the production of sand casting products, comprises first (14) and second molded parts (24), which are movable relative to each other in a direction to Z-axis and have first (14a) and second mold recesses (24a) that partially define the shape of the sand casting product to be produced, a nozzle unit and/or a smooth pressing unit, which is arranged at the side of the first molded part turned away from the first mold recess and is moved relative to the first molded part in the direction of the Z-axis, and an ejector (30) arranged to the first molded part and movable opposite to the nozzle unit or the smooth pressing unit and to the first molded part. The nozzle unit and/or the smooth pressing unit has a nozzle for inserting the sand into the mold recesses or a smooth pressing pin for smooth pressing of the inserted sand. The smooth pressing pin partially extends into an access hole aligned in the direction of the Z-axis. The ejector has an ejector pin extends in an ejector hole of the first molded part different from the access hole extending in the direction of the Z-axis. The ejector is arranged between the first molded part and the nozzle unit and/or the smooth pressing unit, where openings, through which the nozzle extends to the nozzle of the nozzle unit and/or the smooth pressing pin of the smooth pressing unit, are provided in the ejector. Fixed interaction portions are provided to the ejector on one side and to the second molded part on the other side, and are formed for direct or indirect cooperation. The ejector is moved relative to the first molded part during closing the molded parts, so that the ejector is removed from the first mold recess. An actuator is arranged between the first molded part or the smooth pressing unit on one side and the ejector on the other side. The ejector is power-admittable against the first molded part by the actuator, so that the ejector pin engages into the mold recess. Energy storage is provided to the actuator at the casting tool side and is arranged for operating the actuator, where the energy level of the energy storage is increased during closing the both molded parts. The actuator and the energy storage are formed by an elastically deformable spring unit. The molding of the smooth pressing pin and the access hole arranged to the smooth pressing pin are coordinated to each other, so that the smooth pressing pin reaches into an end position in the area of the mold recess side ends of the access hole rotating in touching contact with an inner wall of the access hole. The distal end of the smooth pressing pin and the end of the access hole arranged to the first mold recess are taperedly formed to each other in a corresponding manner. An elastically deformable sealing section is provided at the distal end of the smooth pressing pin and is made of a material with E-module of 0-2 kN/mm 2>. The sealing section is provided as separate sealing element, which is fixed at a base section of the smooth pressing pin, where the materials of the base section of the smooth pressing pin and the sealing element of the smooth pressing pin differ from each other. The sealing element is formed as cap, which is exchangeable without tools.