SU401497A1 - FORMING FOR HOT CASTING UNDER PRESSURE OF RECTIFIED PLATES - Google Patents

Description

one

The invention relates to a technique for the manufacture of fittings, such as finned plates, from refractory compounds such as carbides and nitrides by slip casting methods, in particular, during hot molding of pressure slips on a thermoplastic bond.

Known forms, including the matrix and the punch.

However, after casting, the molds must be disconnected from the casting.

Casting parts with frequent high and long ribs is associated with considerable difficulties, which are caused, on the one hand, by the considerable forces of adhesion of the thermoplastic slip to the walls of the mold, and, on the other hand, by the relatively low hardness of the thermoplastic slip.

The purpose of the invention is to reduce the adhesion forces between the slip casting and the casting mold and the simplification of the casting out of the mold.

For this, the punch is made of plates whose thickness corresponds to the thickness of the ribs and hollows of the casting, the plates forming the hollows being mounted with the possibility of displacement in the slanting cuts relative to the plates forming the outer surface of the ribs during the casting.

FIG. 1 shows the proposed form for casting plates with one-sided fins; pas figs. 2 is a section along A-A in FIG. one; in fig. 3 shows a punch with mutually movable elements, general view; pas figs. 4 shows a diagram of the movement of 1 flat mutually mobile elements when detaching the casting from the punch; ; pas figs. 5 shows the form of pouring plates with double-faced fins, cross section; in fig. 6 - plates with one-sided and two-sided fins.

The mold for casting with one-sided fins consists of a die 1, a punch 2, a base 3 and a cover 4.

The heated slip is fed under a certain pressure from the injection molding machine through

the hole of the base of the form in the working space formed by the punch and the smooth inner surface of the die. Punch consists, in turn, of a set of moving

5 and fixed plates, placed on axles x 7 between the side slats 8. Width

5 movable plates greater than the width of the plates

6 by an amount equal to the height of the edges of the molded part. Plates 5 and 6 have opposite projections at the ends. The plates 6 are fixedly mounted on the axis 7, and the plates 5 can move from 1 in relation to these axes along the slanting slit in them.

When moving, movable plate poapson

are in the extended position. After

By cooling the casting, it can be easily removed from the die along with the die. In order to detach the casting from the punch, it is sufficient to apply force to the ends of the plate cuff. In this case, the plates 5, slidable with their oblique slits along the axis 7, are displaced relative to the plates 6 and exit from the depressions of the casting fins.

After this, the casting can be removed from the punch.

The proposed form can be used to cast more complex parts, such as plates with double-sided fins (Fig. 6). In this case, two punches 9 and 10 are used, which are interconnected by means of side strips 11.

The slip is fed into the gap between the pins, and therefore the need for an additional package like matrix 1 is eliminated.

The remaining elements of the form are similar to those previously described.

Subject invention

The mold for hot casting under pressure finned nlastpn, comprising a matrix and a punch, characterized in that, in order to reduce the adhesion forces between the cast iron casting and the casting mold and to simplify the excavation of the casting from the mold, the punch is made of plates, the thickness of which corresponds to the thickness of the ribs and the hollows of the casting, the plates forming the hollows being mounted with the possibility of displacement in the slanting slots relative to the plates forming the outer surface of the ribs during the casting.

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