DE1121775B - Pressure chamber for a press casting machine for metals operated by piston pressure - Google Patents

Description

The invention relates to a pressure chamber for a piston pressure operated compression molding machine for Metals in which the pressure chamber has a loading opening lined with a refractory material has, in which a stripping piston moves, the pressure chamber at the end of its stroke flush, and wherein the pressure chamber with an injection chamber arranged perpendicular to it is connected via a narrowing, tangentially opening into the injection chamber channel.

In the so-called "collar pouring", the metal is poured into a shape via a tangential one Sprue hole. The aim here is that the metal flowing in on a circular path has a assumes a uniform temperature. The metal, which has cooled down a little after one cycle, always mixes with it the newly added metal. In casting machines with piston pressure, it is already known that the metal to flow from a vessel through tangential channels into the injection cylinder. The air will sucked off by a special pump. It is also already known in die casting machines, the pouring channel, which runs obliquely upwards to the mold, is gradually narrowing.

The invention is based on the object of the pressure chamber end of a pressure casting machine for metals form so that the pressurized metal in the injection chamber is directed downwards Helical path describes the air entrained by the centrifugal effect cut out so that an absolutely bubble-free casting can be achieved.

The invention that solves this problem in the simplest way, is that the channel after a Upward bend is inclined downward into the injection chamber.

In the drawing, FIG. 1 shows a cross section through the pressure chamber of a compression molding machine;

Figs. 2 and 3 show, in section, an elevation and a plan view of the pressure chamber, respectively.

The loading opening 1 (Fig. 1) of the pressure chamber 3 is lined with a refractory material. In this a stripping piston 2 moves, which is flush with the pressure chamber at the end of its stroke concludes.

After the melting container has emptied its contents into the pressure chamber 3, the stripping piston 2 lowered, around any still adhering to the loading opening 1 solidified Scrape off metal residue. Then the pressure chamber piston is put into action.

As can be seen from Figures 2 and 3, the pressure chamber is for piston pressure Actuated die casting machine for metals

Applicant:

Directed by Nationale des Usines Renault,

Billancourt, Seine,

and Societe des Hauts Fourneaux et Forges D'Allevard, Paris

Representative: Dr. K. Schwarzhans, patent attorney,
Munich 19, Romanplatz 9

Claimed priority:
France of August 28, 1952 (No. 634 109)

from the pressure chamber 3 to the injection chamber 7 leading channel after an upward bend downward inclined into the injection chamber 7.

The metal jet coming from the pressure chamber 3 thus describes a helical line in the injection chamber 7 which is inclined downward by the angle α. This angle α can be of the order of about 20 °. In order to achieve this result, the channel which opens into the injection chamber 7 and formed by the end of the pressure chamber narrows from B to A and opens tangentially to the wall of the injection chamber 7.

Claims (1)

PATENT CLAIM: Pressure chamber for a piston pressure operated die casting machine for metals, in which the Pressure chamber has a loading opening lined with a refractory material, in which a stripping piston moves, which on the 109 759/365 At the end of its stroke, the pressure chamber closes flush, and wherein the pressure chamber is connected to an injection chamber arranged perpendicular to it via a narrowing channel opening tangentially into the injection chamber, characterized in that the channel is inclined downwards into the injection chamber after an upward bend. Considered publications: German patent specifications No. 887 203, 860 402, 742 182, 706 609, 701 707, 479 036, 370 613, 282 321, 3545;
Frommer, "Handbook of Injection Molding Technology", 1933, p. 98, fig. 43c / d;
Dubbel, »Pocket Book for Mechanical Engineering«, 1935, Vol. I, p. 335, section C. For this purpose, 1 sheet of drawings