Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1990-12-12
1993-02-23
Seidel, Richard K.
Metal founding
Process
Shaping liquid metal against a forming surface
164312, 164347, B22D 1712
Patent
active
051881659
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method of die casting of the type set forth in more detail below. Also, the invention relates to a device used in die casting according to the first claim, which relates to a device.
In order to rationally utilize the capacity of a die casting machine it is often used to cast different objects. In order to cast such objects, i.e. in order to pass from the casting of a certain object type to another such object type, the lower as well as the upper piston and also the tube-shaped filling chamber usually are exchanged and of course also the mold and the tube, which surrounds the lower piston. Of course, this is always a time-consuming and expensive procedure, which is something objectionable. Also, the casting procedure is obstructed in this way, since e.g. constantly altered diameters of casting pistons, used at the moment, result in fluctuating pressures, which usually are not acceptable or even attainable. Consequently, an alteration of the casting piston diameter, i.e. a casting piston exchange, has to be accompanyed by a corresponding alteration of the pressing pressure of the machine. This leads automatically to a great risk, that personnel will make miscalculations or misadjustments as regards the pressure, a quality deterioration or even a rejection of castings produced resulting. Also, undesirable air entrapments can not always be positively avoided in the known die casting machines.
The object of the present invention is to improve and develop the known die casting methods and devices in the above-mentioned respects. Also, another object is to contribute to the advancement of the art in this field in various respects and create opportunities for a rational technique and products having a satisfactory and uniform quality.
These objects are attained by the method and apparatus more clearly set forth in the following description and appended drawings.
Additional characterizing features and advantages of the present invention are set forth in the following description, reference being made to the accompanying drawings, which partially schematicly show an embodiment, which is not limiting, of a die casting device according to the invention, and in which:
FIG. 1 shows a device according to the invention in its casting position, i.e. after a closing of the molds and a filling of liquid metal but before the casting itself; FIG. 2 shows the device according to FIG. 1 after the completed casting; and
FIG. 3 shows the device according to FIG. 1 after the discharge of the castings produced, being prepared to return to the starting position for the next casting cycle.
In the drawings a device 1 according to the invention, shown in its entirety, comprises a machine frame 2, which mainly comprises an upper base plate 3, from which four machine bearers 4 project downwards, the lower ends of which support a lower machine table 5, which is supported by feet 6.
Upper base plate 3 supports four hydraulic form cylinders 7, designed to open and close a mold, which is described in the following text, by means of a control system, known per se (not shown). Piston rods 9 project from form cylinders 7 downwards through bores 8 in the base plate, and an upper machine table 10 is suspended from the lower ends of said piston rods and is displaceable along machine bearers 4 by means of guide bushings 11.
A yoke 13 is positioned above upper machine table 10 by means of spacing rods 12, at a distance from and preferably centered above this machine table. Yoke 13 supports an upper piston cylinder 14, which projects upwards through an opening 15 in the base plate, which opening is wide enough to allow also the yoke in its position according to FIG. 3 to pass.
A piston rod 17 projects downwards through an opening 16 in yoke 13 and is provided with an upper piston 18, which is inserted into a tube 19, which is fastened to upper machine table 10, encloses a filling chamber 20 and is provided with a filling funnel 21, designed to introduce a certain measured amount of liquid metal.
An upper mold part 2
REFERENCES:
patent: 3038220 (1962-06-01), Saives
patent: 3443628 (1969-05-01), Carr
patent: 4601321 (1986-07-01), Tokui et al.
Seidel Richard K.
Tour & Andersson AB
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