Device for supplying spray units for die casting machines with a

Metal founding – With coating means

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Details

164 72, 239304, 137566, B22C 300, F04B 4100

Patent

active

047211504

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a device for supplying spray units for die casting machines with a fluid containing water and additives for cooling, cleansing and/or lubricating purposes.
During die casting processes the opened mold's interior is wetted with a fluid containing dissolved, suspended or emulsified additives prior to casting. The fluid is used for separating, cooling and/or lubricating. The composition of the fluid is contingent upon the material and the shape of the castings, above all upon their wall thicknesses as well as upon the conditions for a rapid and simple removal from the mold. The fluid is sprayed by spray units onto the walls of the mold. It is prior art to connect a spray unit arranged at a die casting machine with a tank from which the fluid is delivered by means of compressed air to the dies of the spray unit (Praxis der Druckgiessfertigung von E. Brunhuber, 1980, Fachverlag Schiele & Schon GmbH, on page 128).
Frequently, for diverse molds fluids having differing compositions and spray units adjusted to the respective mold are required. If at changing the mold the fluid supply in the tank is not exhausted, the tank must be emptied and filled with a mixture harmonized with the other mold. Moreover, it may also happen that the tank's capacity does not suffice for a major series of the same mold. Then, the die casting procedure must be interrupted at exhaustion of the fluid supply during automatic operation.


SUMMARY OF THE INVENTION

It is the object of the invention to create a device suited for automatic operation for supplying one or several spray units for die casting machines with each a fluid containing water and additives for cooling, cleansing and/or lubricating purposes.
According to the invention the above problem is solved by utilizing a device for supplying a plurality of spray units, each for a die casting machine, which comprises at least one first central tank for storing water containing additives of a concentration being the maximum necessary of the particular materials, molds and methods used, a further central tank for storing water, a mixing valve having a first inlet connected to the first central tank and a second inlet connected to the further central tank, an outlet, and means for adjusting the proportion of liquid from the first and further central tanks delivered through the outlet, and a pump for each spray unit having an inlet connected to the outlet of a respective mixing valve, and an outlet connected to a spray unit. The device as described makes an adjustment of the desired mixing ratio by the mixing valve at the respective die casting machine possible. Then, only the amount of fluid especially tailored to the respective mold is produced according to the necessity of the individual spraying procedure. At changing the molds nothing but the adjustment of the mixing valve must be altered if a new mixing ratio is required. Such adjustment takes only short time. The process of production is, therefore, no longer affected by the time-consuming re-filling or exchanging of the fluid for the spraying step. By the device described herein better use may be made of the die casting machines as there are less setting periods. It is the principle of present invention to store fluids having the highest concentration necessary and for making the dilution with water required for each casting step prior to spraying.


DESCRIPTION OF THE PREFERRED EMBODIMENTS

A preferred example of embodiment provides a number of central tanks corresponding to the type of casting materials to be treated in the die casting machines, in which fluids each of water and additives are stored in the highest concentration required for the respective casting material with a corresponding mold, the central tanks being coupled through reversing valves to a piping system to which the mixing valves are connected. At a change of the type of die casting material to be processed, e.g. when changing from aluminum over to zinc die casting, on one or several of the die casting m

REFERENCES:
patent: 2587722 (1952-03-01), Garrett et al.
patent: 3421694 (1969-01-01), Muller
patent: 4186769 (1980-02-01), Buyer

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