Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1991-09-17
1993-04-27
Seidel, Richard K.
Metal founding
Process
Shaping liquid metal against a forming surface
164131, 164314, 164320, 164321, 164343, 164344, B22D 1710
Patent
active
052053393
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a die casting machine wherein the ejector mechanism is telescoped within the main piston and the core mechanism is telescoped within the ejector cylinder where both the ejector mechanism and core mechanism travel with the main piston.
In a conventional die casting machine a frame is provided and a fixed or stationary plate upon which one-half of the mold for making the part is mounted on the frame. The other half of the mold is mounted upon a moving plate which allows the cast part to fall out of the machine when in the open position and the moving plate is clamped shut with sufficient force to contain the molten metal while the mold is being filled. In operation, the part separates from the half mold on the fixed plate (the cover half) and is retained on the half mold of the moving plate (the ejector half) as it moves open following solidification of the molten metal which was injected into the mold cavity. The part which was retained on the moving or ejector half of the mold must then be ejected from it to fall out or be transferred out of the machine. The one-sided motion described above is one of the major causes for the various and complicated types of automatic part-transfer mechanisms associated with conventional casting machines which have been retrofitted with some sort of part-transfer. The same problem then arises as the part is indexed to a secondary operation such as trimming wherein a similar one-sided machine is used. The part-transfer carrier is required to have both an indexing function and a lateral movement to match the plate closing and opening stroke as the part is brought into a fixed position for the desired operation.
This conventional form of machine was greatly improved upon by the machine shown in the U.S. Pat. to Perrella, 4,013,116 which issued on Mar. 22, 1977. This machine is much simpler than conventional devices in that the part was cast, indexed and removed from the machine for trimming without any lateral movement of the part. During processing the part is in a fixed plane and is transferred in that plane. The casting machine has balanced forces in which both plates and mold halves or dies are moved equal distances to and from the part plane and this balanced movement of mass cancels out the normal shock of starting and stopping heavy plates and tools, equalizes thermal expansion differences and automatically centers load deflections.
The machine described in U.S. Pat. No. 4,013,116 consists of a frame, mold mounting plates and hydraulic closing and opening cylinders having a simple deceleration system to eliminate closing shock. A mold configuration is provided and is adaptable to a large variety of part styles and is of pre-determined registry in the machine plates so as to eliminate mold miss-match because of thermal expansion of poor die set practices. Metal-injection of the machine is provided with an infinitely variable control capable of presetting to any desired speed or pressure, together with a self-contained molten metal supply with electric resistance heaters therein.
A self-contained hydraulic power system is incorporated, using fire-resistant fluid. Provision is made to pre-heat the molds prior to the first shot. The machine features a self-contained heat unit for cooling the molds and eliminating lime deposits in the cooling passages all of which is automatically connected to the mold during installation without hoses or pipes.
While the machine of Perrella et al is in commercial use, there is a need for a more compact design wherein the same performance is achieved with fewer individual components thus reducing the number of precision components necessary.
According to one embodiment of the present invention there is provided a die-casting machine of the balanced dual movement type in which both halves of the molds or dies are moved equal distances from the part plane comprising: in spaced, face-to-face relationship, and for each stationary, main cylinder, slidable in that main cylinder from a forward mold halves engaging position
REFERENCES:
patent: 1724332 (1929-08-01), Will et al.
patent: 3344848 (1967-10-01), Hall et al.
patent: 4013116 (1977-03-01), Perrella
patent: 4779666 (1988-10-01), Ruhlandi et al.
DBM Industries Limited
Puknys Erik R.
Seidel Richard K.
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