SU280779A1 - Method of making metallic moulds - Google Patents

Description

The invention relates to the manufacture of casting tools, such as chill molds and npedc molds for injection molding.

Known is the fabrication of metal forms by surfacing a heat-conducting metal onto a thin-wall heat-resistant metal shell previously obtained, for example by casting, which forms the working cavity, but the accuracy of castings is reduced due to wear of the working surface and deformation of the form.

The proposed method is characterized in that the inner shell is obtained by pouring a melt: into the gap formed after removing the deformed shell from one half-form assembled with other deformed parts of the same form and the models installed in them

This makes it possible to reduce the effect of warping and deformation of the shells on the accuracy of castings, reduce the cost of manufacture of the molds and increase their service life.

Figure 1 shows the assembled metallic shape; in fig. 2 - deformed shape after exposure to high pouring temperatures; in FIG. 3 the manufacture of the upper half-form; in fig. 4 - manufacture of the bottom half-form; figure 5 - General view of the restored form.

Half-molds are made as follows.

The removable deformed metal shell 1 is removed from the upper half-form 2, which is assembled with the lower lower half-form 3 having the deformed shell 4 and the model 5 installed in it, and the intermediate frame 6 along the plane of the connector with a thickness equal to the sum of the thicknesses of the shells 1 and 4 (see fig.Z). The melt is poured into the formed gap, obtaining a new shell of the upper half-form 2.

The deformed shell 4 in the lower mold half 3 is also replaced (see Fig. 4). After manufacturing both parts of the detachable metal mold

the technological openings are closed with plugs 7, the molds are prepared for casting parts and assembled (see fig. 5),

FIG 5

Claims (1)

METHOD FOR PRODUCING METAL FORMS, including the production of thin-walled inner shells forming the working cavity of the mold, using the model, characterized in that, in order to reduce the effect of warping and deformation of the shells on the accuracy of castings, reduce the cost of manufacture and increase the service life of the molds, a deformed shell of one of the half-molds they are removed, and the molten metal of the shell is poured into the formed gap between the half-mold body, the model, and the other half-mold with its deformed shell, and then into the similar a shell of another half-mold is cast.