Patent DE-102006027171-A1 (DE)
Title: Device for low pressure hot casting of light weight metal component, comprises intake for transporting casting mass, a form tool for filling with the casting mass, and pressure amplifier having piston with upstream and downstream sections
Inventor: PAULICK CARL
IPC: B22D18/04
Filed: 2006-06-07
Abstract: The device for low pressure hot casting of light weight metal component, has an intake (5) for transporting casting mass, a form tool (6) for filling with the casting mass, and a pressure amplifier (3) having a piston (9) with upstream and downstream piston sections, an intermediate chamber (1), which surrounds the downstream piston section and a provision unit arranged in the intermediate chamber between the upper end of the amplifier and upper end of the upstream piston section. The intake, the amplifier and the form tool are arranged with one another in flow direction of the casting mass. The device for low pressure hot casting of light weight metal component, comprises an intake (5) for transporting casting mass, a form tool (6) for filling with the casting mass, and a pressure amplifier (3) having a piston (9) with upstream and downstream piston sections, an intermediate chamber (1), which surrounds the downstream piston section and a provision unit arranged in the intermediate chamber between the upper end of the amplifier and upper end of the upstream piston section. The intake, the amplifier and the form tool are arranged with one another in the flow direction of the casting mass. The downstream piston section has a small cross section than the cross section of the intake in the area, in which the piston is submerged. The provision unit subjects the piston with a power that counteracts the flow direction of the casting mass and spends the piston into a first lower position for filling of the form tool. In the lower position, the upstream section of the piston is submerged into the intake. The bore is connected at a lower end of the piston with the intake and at an upper end of the piston with the form tool for transporting the casting mass from the intake into the form tool. The piston in a second position reaches through withdrawing of the power from the provision unit. In the second lower position, the piston is moved against the first position towards the top into the form tool for pre-condensation of the mass in the form tool. The connection of the bore with the intake works according to the relationship of the cross-section area of the piston as pressure amplification of rising pressure. The intake has a stop that limits the immersion of the first piston section in the casting mass. The pressure in the intake is 0.2-1 MPa. The pre-condensation pressure at the form tool is 0.3-6 MPa. The temperature of the casting mass is 70-95[deg]C. The means for subjecting the piston with the power has a compressed air pipeline flowing into the intermediate chamber. The intermediate chamber and the piston are subjected with compressed air by the compressed air pipeline. The piston is adjustable from the first position to the second position and from the second position to the first position under cooperation of restoring force of the restoring unit, which is a magnetic coil or -spring. A part of the piston is magnet. The piston with a power is subjected to the beginning of the spraying cycle of the unit for subjecting the piston with the power that is larger or equal to the power that influences the lower area of the piston through the flow pressure in the intake. The casting mass consists of 80-90 wt% ceramic powder, 10-20 wt% binder, cermets, metal and/or polymers. Independent claims are included for: (1) pressure amplifier for device for low pressure hot casting; and (2) procedure for low pressure hot casting.