SU609589A1 - Pattern-making method - Google Patents

Description

one

The invention relates to foundry, primarily to a method for producing models in the manufacture of cast dies for extruding metal,

A known method of making models

extrusion dies, including the formation of transition surfaces from the contour of the container cavity to the contour of the output part of the matrix channel by means of an elastic diaphragm, which is operated by a plunger through a template, the cross section of which corresponds to the cross section of the output part of the matrix channel.

However, this method does not allow the working surface of the matrix to approach c to the natural metal flow surface during extrusion for single-channel arrays with a complex nonconvex cross-sectional shape of the output part of the matrix channel, as well as for multi-channel x extrusion matrices. The known method also does not allow obtaining the surface of the inlet part of the die channel, which approaches the surface of the natural flow of the extrusion metal.

The aim of the invention is to obtain the surface of the die channel approaching the surface of the natural flow of the metal during pressing.

To this end, a method is proposed in which the elastic diaphragm is preliminarily applied to additional templates thus forming the contour of the inlet part of the matrix channel, approaching the contour of the natural flow of the metal during pressing. At the end of compaction of the molding mixture with an additional template And a pattern, the cross section of which corresponds to the cross section of the output part of the die channel, openings corresponding to the output part of the die channel are formed in the thus obtained template model blanks. The billet is filled with bulk material with closed channels. The channel is then opened and the remaining part of the bulk material is fixed.

Claims (2)

Figures 1-5 show the steps of making a model using the example of a two-channel Matrix and a device implementing the proposed method. V shell 1 (F1P 1}, the internal cavity of which corresponds to the mold and the outer dimensions of the matrix model, establishes and fixes an elastic one, for example a rubber diaphragm 2. Under the action of load P, applied to this diaphragm by plunger 3 through templates 4 with cross sections, corresponding sections — I have output parts of the channel of the mat, and under the action of load P, applied by a plunker 5 through an additional template 6 with a red line configuration corresponding For example, the parts of the spherical surface, the crissing surface of the inlet part of the matrix channel to the surface of the natural flow of the metal during extrusion, provide a smooth, stepless transition of the surface layers of the ingot upon issuing Ivanov from the containers to the surface of the channel matrix. By adjusting the depth H, the elastic film is given a preliminary shape of the surface of the die channel. In this case, the internal cavity of the shell may be filled with a solidifying mass of known composition with a small coefficient of volumetric change upon solidification, for example, with epoxy resin, which will be displaced through the opening 7 or filled with this mass through the opening 7 after the formation of the elastic diaphragm during formation of the elastic diaphragm. After solidification of the mass, a billet of models 8 is obtained (Fig. 2), D of which, by any known method, after removing it from the shell, make holes .9 corresponding to the 1st output part of the die channel. The cavity 10 (Fig. 2) is filled with a flowing medium 11 (Fig. 3), for example, with dry quartz sand, with the openings 9 being closed by a shutter 12. When the AI of the shutter 12 is opened, the flowing bulk 11 is drilled from the openings 9 (Fig. 4) . Part of the medium 11 (Fig. 4) lingers on the surface of the model at a place where its natural movement is difficult, forming a sand mound 13. The contour of the sand mound 13 (Fig. 5) together with the contour of the model 8 billet constitute the surface of the contour of the matrix model approximating the metal flow when applied to the natural flow. The sand mound 13 is fixed to the surface of a model 8 billet, for example, by impregnating and friable media without a hardened form with a hardener or by heating self-melting granular mixtures. After fixing the sandy embankment, the resulting model 14. without additional machining is used in the process of preparing the dies on the copying, drilling machines or forming the ground during the casting of dies. From 1, the attainment of models by the method described simplifies the process of making models. Matrices made on such models require minimal mechanical refinement compared to the manufacture of similar matrices on models made in another way. In addition, the proposed method of obtaining the working surfaces of the matrix provides a uniform and close to the natural flow of the metal during pressing, which improves the quality of the products obtained by extrusion through such matrices as compared to the products obtained by extrusion through other known matrices. The invention The method of making models is predominantly the inlet part of the channel of the press mats for squeezing the metal, including sealing the molding sand with an elastic diaphragm by acting on it with a template. a wreath, the configuration of which corresponds to the outlet of the channel of the matrix, characterized in that, in order to obtain the surface of the channel, approximating; s to the surface of the natural flow of metal during extrusion, the elastic diaphragm is preliminarily affected by an additional template, the configuration of which corresponds to the inlet of the matrix channel, and after the mixture has been compacted, bulk material is poured into the resulting cavity of the channel, which is then poured out through the outlet of the matrix channel and left the cavity of the channel particles of the bulk material fasteners. Sources of information taken into account in the examination: 1. USSR Author's Certificate No. ZZO900, cl. B 22 C 7 / OO, 1969. L.J, vJ.Jl- .rV Y //// 7 //// 7 /// 7 // 7A Y //////// // A –v. , . 1 / y: 1L -. - /% -: / - l, //. «. kV: .7ve:, 7 --- “ikiy .: V: 15.1 1 L -.-“ -x 1Dv -..-- v-l1 1 -..-.; X. . I .-, i O.I. I. ". V. "- -e- -: - :. K- ,. /. - / - V I-. ,, I 14. V v.C v..4ЧхЧхЧххч