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a molding method and semi-solid technology, applied in the direction of chemistry apparatus and processes, metal founding, etc., can solve the problems of inability to reuse process offal, severe limitations in the commercial application of ssm processes, etc., and achieve high and reliable strength and ductility. , the effect of reducing the cost of producing parts
Inactive Publication Date: 2005-03-17
THT PRESSES INC
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[0004] The present invention is directed to a new SSM process or method which significantly reduces the costs of producing parts by the SSM process. The method of the invention is ideally suited for producing parts having thin sections, fine detail and complexity and close dimensional tolerances, and which are substantially free of porosity and oxides, can be processed at elevated temperatures without blistering and which can provide high and reliable levels of strength and ductility. The method of the invent
Problems solved by technology
The cost premiums associated with either the pre cast specially treated billet that must be sawed to length before using, or the slurry especially prepared in equipment external to the die casting press, have severely limited the c
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[0015] Referring to FIG. 1, a vertical die cast machine or press 10 is constructed similar to the press disclosed in U.S. Pat. No. 5,660,223 which issued to the assignee of the present invention and the disclosure of which is incorporated by reference. The press 10 includes a frame 12 formed by a pair of parallel spaced vertical side walls or plates 14 rigidly connected by top plate 16 a base or bottom plate 18 and a set of intermediate cross plates or bars 22 and 24 all rigidly secured to the side panels 14. The top cross plate 16 supports an upper double acting hydraulic clamping cylinder 30 having a piston rod 32 projecting downwardly on a vertical center axis of the press. The piston rod 32 carries an adapter plate 34 which supports a hydraulic ejector cylinder 36 having a piston 37 projecting downwardly to support a plate 38 which carries a set of ejector pins 39.
[0016] An upper die or mold section 40 (FIG. 2) is secured to the bottom of the plate 38 by an annular retaining pl...
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Abstract
A metal alloy is heated to a molten state, and a grain refiner may be added. The molten alloy is poured into a shallow chamber of a shot sleeve of a vertical die cast press and on top of a shot piston. The shot sleeve is transferred to an injection station while the molten alloy cools to a semi-solid slurry with a globular, generally non-dendritic micro structure. An inner portion of the shallow slurry is injected upwardly by the piston through a gate opening into a die cavity while an outer more solid portion of the slurry is entrapped in an annular recess. After the slurry solidifies, the shot piston retracts, and the shot sleeve is transferred to a position where the residual biscuit is removed. The shot piston may have internal grooves to provide a large heat transfer area for cooling water to absorb heat from the molten alloy.
Description
RELATED APPLICATIONS [0001] This application is a continuation-in-part of application Ser. No. 10 / 700,004, filed Nov. 3, 2003, U.S. Pat. No. 6,808,004, which is a continuation of application Ser. No. 10 / 066,527, filed Jan. 31, 2002, abandoned.BACKGROUND OF THE INVENTION [0002] The present invention relates to semi-solid molding (SSM) of metal alloys and the equipment and methods used for SSM, and which are disclosed in many U.S. and foreign patents, for example, in U.S. Pat. No. 3,954,455, No. 4,434,837, No. 5,161,601 and No. 6,165,411. SSM is also discussed in technical publications, for example, in a book entitled Science and Technology of Semi-Solid Metal Processing, published by North American Die Casting Association in October, 2001. Chapter 4 of this publication was authored by a co-inventor of the present invention. In conventional SSM processes, it is necessary to use either a specially treated, pre-cast billet of appropriate microstructure or a slurry especially prepared fr...
Claims
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