SETT ATT PRESSGJUTA EN METALLPRODUKT MED ETT DERI INBEDDAT IHALIGT METALLELEMENT

摘要

The method of die casting a metallic cast product having a hollow metallic member embedded therein by locating the hollow member in position in a casting cavity and injecting molten metal into the cavity around the hollow member including confining a pressure resisting medium within the interior of the hollow member by seals prior to injecting the molten metal into the cavity, thereby positively preventing the hollow member from being collapsed by the pressure of the molten metal injected into the cavity. The pressure resisting medium is sealingly confined within the hollow member by tightly applying a sealing plug to the respective open ends of the hollow member after the pressure resisting medium completely fills the hollow member. One of the sealing plugs may be movable in response to the increase in the internal pressure of the pressure resisting medium. The movable plug is located in cooperation with a plunger actuated by a fluid actuated cylinder mechanism so as to apply to the movable plug a constant resisting force resisting against the internal pressure of the pressure resisting medium. This permits the movable plug to be moved depending upon the increase in the internal pressure of the pressure resisting medium so as to relieve the internal pressure and prevent the hollow member from being damaged due to the excessive internal pressure of the pressure resisting medium.