Dual plunger gooseneck for magnesium die casting
a magnesium die casting and plunger gooseneck technology, applied in the direction of manufacturing tools, transportation and packaging, liquid transfer devices, etc., can solve the problems of inability to support automotive volume, inability to design and incorporate magnesium components, and certain drawbacks of magnesium use in automotive components, so as to reduce cycle time, reduce waste, and improve quality and consistency of die castings
Inactive Publication Date: 2008-06-19
FORD GLOBAL TECH LLC
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Benefits of technology
The present invention is a system and method for die casting magnesium and similar metals using a multi-point injection hot runner system. The system includes a gooseneck with a dual plunger that draws molten metal from a crucible and directs it to the mold cavity. The system provides better control over heat and flow, minimizing waste and recycling. The method and apparatus of the invention improve the quality and consistency of die castings, reduce cycle time, and require less maintenance as compared with known systems.
Problems solved by technology
However, the use of magnesium in automotive components is burdened with certain drawbacks.
While magnesium is abundant as a natural element, it is not available at a level to support automotive volumes.
This situation causes hesitation among engineers to design and incorporate magnesium components.
The raw material cost of magnesium relative to other commonly used materials is also an impediment to mass implementation in the automotive industry.
Current techniques for casting parts from magnesium make expanding the use of magnesium into a broader array of products less attractive.
This approach results in inferior material properties and waste material.
Method used
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[0033]In the following figures, the same reference numerals will be used to refer to the same components. In the following description, various operating parameters and components are described for one constructed embodiment. These specific parameters and components are included as examples and are not meant to be limiting.
[0034]With reference to FIG. 1, a diagrammatic view of the hot chamber apparatus of the present invention is illustrated, being generally illustrated as 10. The apparatus 10 is entirely self-enclosed, preventing atmospheric exposure of the liquid melt. It is to be understood that while the present invention is directed at the formation of components from molten magnesium alloy, other metals including zinc may be used.
[0035]The hot chamber 10 includes a casting die 12. The casting die 12 includes a cover half 14 and an ejector half 16, a hot runner assembly 18 partially recessed within the cover half 14 of the casting die 12, a gooseneck 19, a shot plunger 20 opera...
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Abstract
A mechanical apparatus and method for the casting of metal components is disclosed. The apparatus includes a gooseneck having dual plungers for drawing molten metal from a crucible of hot metal and for forcing the drawn molten metal through the system, a hot runner assembly having a thermal valve developed in time and positioned adjacent the mold cavity, and a machine nozzle positioned between the gooseneck and the hot runner assembly. The dual plunger is fitted with a shot plunger and a shutoff plunger which work in conjunction to allow for molten metal to be drawn into the gooseneck but to stop its passage into the gooseneck when the metal is forced through the system into the die. Both temperature and flow rate are carefully monitored and controlled. Two embodiments of the gooseneck are provided in which the positions of the shot plunger and the shutoff plunger are altered and in which the molten metal is drawn into the gooseneck at different locations.
Description
GOVERNMENT CONTRACT INFORMATION[0001]This invention was made with United States Government support awarded by the following program, agency and contract: NIST Advanced Technology Program, the United States Department of Commerce, Contract No. 70NANBOH3053. The United States has certain rights in this invention.TECHNICAL FIELD[0002]The present invention relates generally to the casting of magnesium components. More particularly, the present invention relates to a method and apparatus for die-casting magnesium components from molten magnesium using a hot runner system in which both temperature and flow rate are controlled.BACKGROUND OF THE INVENTION[0003]Magnesium is an attractive material for application in motor vehicles because it is both a strong and lightweight material. The use of magnesium in motor vehicles is not new. Race driver Tommy Milton won the Indianapolis 500 in 1921 driving a car with magnesium pistons. A few years after that magnesium pistons entered mainstream autom...
Claims
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IPC IPC(8): B22D17/00B22D35/04
CPCB22D17/04
Inventor LI, NAIYICOOPER, RONALDDEVRIES, JIMSCHOLTEN, TOMGOPAL, NANDA
Owner FORD GLOBAL TECH LLC