SU910317A1 - Casting mould production method - Google Patents

Description

I

FIELD OF THE INVENTION The invention relates to foundry, in particular, to the manufacture of casting molds by pressing.

Many well-known methods for producing casting molds are aimed at eliminating over-compaction of the mixture in the supra-model space and under-consolidation in the recesses of the model and between the model-top tooling. To accomplish this goal, two methods are recommended: squeezing the excess mixture from the supra-model space into the cavity of the counter-model 1 or reducing the amount of loose mixture (before compaction begins) in the model-like space 2.

The disadvantages of the method of making casting molds by pressing with the excess of the mixture poured into the cavity of the model is the necessity of milling the control panel before installing the molds on the conveyor carriage and associated with

this operation unproductive consumption of sand. ,

Closest to the proposed method of leveling the degree of compaction of the mixture in the supra-model and near-model spaces when pressed with a flat block, but with a profile filling of the mixture in the model-heating equipment before compaction.

This method has not been applied.

10, since it is almost impossible to carry out the profiling of the mixture from the side of the control by free filling it into the modular equipment.

The purpose of the invention is to obtain equal number sealing of the mixture by the volume of the form.

Claims (2)

This goal is achieved by the fact that the profiling is carried out by putting the countermodel onto a modular tool before filling the mixture, and the cavity formed is filled with the mixture by blowing. 39 The drawing shows the sequence of operations. At the beginning of the mold manufacturing process, a model-rim snap-in is assembled, for which purpose the model plate 1 is applied to the mold 2 with the filling frame 3. Then the countermodel 4 is superimposed by filling the mixture onto the resulting container. A formed molding 6 is blown into the resulting process tank (see The countermodel is then removed, a flat press plate 7 (pos. B) is brought in and the mixture is compacted by pressing. After the pressing pad exits to the mold counter 8, pressing is finished (nO3, BJ. As shown by The pre-compacted, blown at a pressure of compressed air in the receiver 0.5-0.6 MPa, has a surface hardness of about 40-40 units of hard to wet forms. This hardness is quite enough so that after removing the countermodel, the cavity formed from collapsing before the start of pressing with a flat block. The flask and the filling frame can be replaced by a molding chamber if it is necessary to obtain the safety of the moldless molds. Using the proposed method for the manufacture of casting molds, it eliminates the the grinding line of the device for milling counter items by half-molds, the turning device for milling the counter half of the upper half-form. Example 4. Blowing instead of free backfilling allows for a clearer imprint :: without under-consolidation and loosening, especially if the model has a complicated configuration, and eliminating doodles that are inevitable when using counter models with cavities to squeeze excess mixture, reduces the mixture consumption for forming . The method can be used in the design of molding machines for the mass production of castings, models of which have a high degree of gradation. The invention The method of making casting molds, including the profile filling of the mixture in the model-tooling equipment followed by compaction with its pressing block, is determined by the fact that, in order to obtain a uniform compaction of the mixture in terms of the volume of the Fr1F1, the mixture, and the cavity formed is filled with the mixture by injection. Sources of information taken into account in the examination 1, USSR Author's Certificate No. 282600, cl. B 22 C 15/10, 1962. 2.Aksenov p.N. Foundry equipment. M., Mechanical Engineering, 1977, p. 45-46. . J - E / 3-7