DE1138518B - Permanent mold for the production of hollow moldings undercut on one side on die casting machines - Google Patents

Description

The invention relates to a permanent mold for producing hollow molds undercut on one side, especially of bends that require the use of subdivided cores to form the inner shape make, on die casting machines with facilities for pulling cores and ejecting of the finished casting.

It is already known to design such permanent molds so that a subdivision of the cavity of the core filling the molding parallel to the direction of movement of the ejector device into one containing the undercut and one none Undercuts forming core part is made, with no undercuts to pull the containing core part a core pulling device effective only in the direction of movement of the ejector device serves, which comes into action after the casting has taken place. To solve the task, the other who To pull the core part containing undercuts, it was with the known devices of this type however, required after exposing part of the mold cavity of the casting by pulling the first core part the second core part first in the space that has become free by pulling the first across and only then remove it from the mold in a different direction. The disadvantage These known devices are that they have an intricate and expensive core moving mechanism require.

According to the invention, this disadvantage is avoided in the simplest possible way that only the Removable core part by simply pulling it out in the direction of movement of the ejector device a core pulling device is attached, during which it is complementary and the undercut inner surfaces forming core part is attached to the ejector collecting plate. This core part changes its position compared to the casting during the opening of the mold and also during the ejection process. That However, the casting can easily be removed from it by shifting it transversely to the ejection direction.

To illustrate the invention, a permanent form is shown in the drawing as an exemplary embodiment shown for the production of a manifold, namely shows

1 shows a longitudinal section through the mold in the casting position,

Fig. 2 shows a plan view of the mold half containing the sprue along the line II-II-II in Fig. 1,

Fig. 3 is a cross section along the line III-III in Fig. 1, and

Permanent form for production

of undercut on one side

Hollow moldings on die casting machines

Applicant:

Mahle-Werk GmbH,
Fellbach (Württ.), Schaflandstr. 3-8

Gustav Lieby, Stuttgart-Luginsland,
has been named as the inventor

Fig. 4 shows the mold in the open state after actuation of the ejector mechanism.

The casting or the cavity is denoted by 1. Its outer shape is determined in a known manner by a movable ejector mold half 2, a stationary mold half 4 containing the sprue 3 and two slides 5, 6, which are movable in the direction of the arrows, but are otherwise connected to the mold half 4 . To form the inner shape, three core pieces 7, 8 and 9 are provided, of which the first two can be pulled in the usual way, while the core piece 9 is attached to the ejector collecting plate 10, which also carries ejector pins 11.

When opening, the cores 7, 8 and the slides 5, 6 are first moved in the direction of the arrows drawn. The ejector mold half 2 is then raised, the ejector device moving with it until it hits against a stop (not shown), the parts taking up the position shown in FIG. The casting now hangs freely in the core part 9 attached to the ejector plate 10 and can can be easily removed after a small shift in the direction of the arrow. pre-condition is of course such a leadership of the partial plane between the cores 8 and 9 that after the drawing of the core 8 enough free space in the cavity of the casting 1 is created.

Claims (1)

PATENT CLAIM: Permanent mold for the production of hollow mold castings undercut on one side on die casting 209 678/285 machines in which a subdivision of the filling the cavity of the cast piece Core parallel to the direction of movement of the ejector in one of the undercuts containing and is made in a core part that does not form undercuts and in the case of the one for pulling the core part, which does not contain any undercuts, only in the direction of movement The core pulling device effective for the ejector device is used, characterized in that that the core part (9) forming the undercuts is attached to the ejector plate (10). Considered publications:
German Patent No. 860 246;
G. Lieby, "Design of Die-Cast Parts", 1949, pp. 53 and 54, fig. 351. 1 sheet of drawings