SU442008A1 - Press form - Google Patents

Description

The invention relates to the manufacture of low-melting models with spherical internal cavities, for example with an undercut, in the manufacture of precision casting.

Molds for the manufacture of Fusible Models are known, comprising two detachable mold halves forming a cavity filled with a model mass with rods attached thereto for forming cavities.

After solidification of the model mass, the half-molds are disconnected and the finished model of rods is removed from the cavity.

If it is necessary to produce castings for parts with complex configurations of internal cavities, in particular, castings with undercuts, use is made of molds with water-soluble cores or molds with a removable adapter plate that forms the internal cavities of the model.

However, the process of making models on known molds is laborious, difficult to automate, which makes them applicable for small-scale or individual production.

Also known is a mold for making models with undercuts, provided with rods with elastic tips.

The elastic tip is made removable and is attached to the rod using a rigid

plates with L-shaped grooves into which pins go. When the rods are removed, the elastic tip deforms (stretches with a decrease in size) and is removed from the cured model.

However, such a design is acceptable only for making models with undercuts that have a one-sided bevel. In the manufacture of models with a full undercut profile of the hemisphere type, such a mold is unacceptable, since in the process of removing the cores, the edges are deformed by an elastic core.

In order to eliminate the above drawbacks, the cores of the proposed mold are made two-stage with protruding tips, on which sleeves interact with the cores and connected through an intermediate plate with a pneumatic cylinder stem are axially movable. In addition, the mold is equipped with a stroke control for moving the intermediate plate, made in the form of a threaded pin mounted on a fixed half-form.

FIG. 1 depicts the mold being described; in fig. 2 - the same, at the moment of removing the load from the core.

The mold includes two half-molds, movable 1 and fixed 2. On the movable

3

half-molds are reinforced rods 3, made two-stage with protruding tips (smaller step), on which elastic cores 4 are located. The latter in the normal state are made in longitudinal section in the form of an ellipse, truncated from two sides n made of elastic material. us). ;; ;,:.:., ..

A pneumatic cylinder 5 is mounted on the non-double-half form, the rod of which carries the intermediate plate 6.

On this plate, reinforced by the number of models of the sleeve 7, the inner diameter of which is adjacent to the diameter of a smaller step of rods. For the proposed mold design, the sleeves 7 serve simultaneously as rods for producing holes in the model.

Before pressing the model mass into the mold, the cavity of the mold is in a closed state.

When air is supplied to the cylinder 5, the plate with the sleeves moves to the left and, resting against the elastic cores 4, compresses them with a force sufficient to give them a given configuration. The final amount of movement of the cylinder rod is adjusted by the threaded pin 8. After the model mass is pressed in and cured, the cylinder rod is retracted to the right. In this case, the load from the cores is removed, and the latter, straightened, take the initial configuration before compression and the particles leave the model cavity.

four

After removing the load from the cores of the half-mold, the divorce is. In this case, the mold 1 is moved to the left. Together with it, the plate 9 with the ejectors 10 moves, as well as the cores with elastic cores that come out of the cavity of the models.

Plate 9. moves until the chain ejector 11 is in contact with the stop (not shown in the drawings).

With further movement of the mold half .1. vytll .. bob. J 0. Slip over the rods, push the model 12 roTOBbie into the water bath.

Subject invention

Claims (2)

1. The mold is mainly for making low-melting models with undercuts, containing a movable half-form with cores with elastic cores fixed on it, and a fixed half-form, characterized in that, in order to reduce the deformation of the models when the rods are removed, the fixed half-form. The ma is equipped with an intermediate plate with a power drive, on which the bushings are fixed, and the rods are made in two stages. With protruding tips under the sleeves, with elastic cores planted on the tips of the rods. 2. A press mold according to claim 1, characterized in that it is sponge-molded with a motion regulator for moving the intermediate plate, made in the form of a threaded pin mounted on a fixed half-mold. d 1 and f 1 if 2 7 in eleven I I I