SU1199419A1 - Method of making shape-forming tools - Google Patents

Abstract

A method of manufacturing mold-forming tools, which includes forging a workpiece, machining and pressing a working relief on it by applying a deforming force with a master tool, characterized in that, in order to increase durability by preventing the end face of the fiber from the surface of the working structure, the surface of the pattern will be improved, by preventing the end face of the fiber from the surface, the body will be covered with a relief pattern, to prevent durability of the surface of the working surface. t melting and mechanical fine-tuning of the surface of the workpiece from the side of application of the defoaming force by the master tool.

Description

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The invention relates to the processing of metals by pressure, in particular to the manufacture of shaping tools (dies, molds).

The purpose of the invention is to increase the resistance by preventing the end face of the output of the macrostructure fiber onto the working surface of the shaping tool.

The method of making shaping tools is as follows.

First, using the forging and machining operations, the initial billet is obtained, then the surface of the billet is melted on which the relief will then be extruded. When the metal is melted on the surface and is subsequently crystallized during solidification, the filament is eliminated. At the same time, defects of metallurgical origin are eliminated. In order to improve the quality of the surface metal, it can be melted and crystallized in vacuum or in a protective atmosphere. Since the low durability of a tool with an end fiber exit to the surface is mainly explained by low contact strength and high diffusion conductivity, the thickness of the melted layer (i.e. the layer without end fiber orientation) must be such as to eliminate the influence of the metal structure, located under it. Practice shows that for most stamps

994191

this value does not exceed 0.5-3.0 mm. In general, the depth of melting depends on a number of factors: the quality of melting (height of irregularities),

5 degrees of deformation after melting, thermal mode of operation of the tool and does not depend from the point of view of the protective properties of the initial thickness of the workpiece or any of its other geometrical parameters. However, to obtain fine grains in the melted layer, a high crystallization rate is required, which is achieved by intensive heat removal by weight. Therefore, the thickness of the preform must be at least 10 times the thickness of the melted layer.

After cooling, the preform is mechanically fine-tuned to the melted surface to eliminate irregularities caused by hardening of the molten metal layer. Then, a MacTep deforming force is applied to this surface with a tool and the required relief is extruded. In this case, the grains of the melted layer are stretched in the direction of the greatest deformation and form a fibrous structure repeating the contour of the extruded relief.

The method can also be used to eliminate the fiber end output only on a small portion of the working relief, the performance of which limits the durability of the entire instrument.

Claims (1)

I METHOD FOR MANUFACTURE OF FORMING FORMING TOOLS, including operations of forging a workpiece, machining and extruding a working relief on it by applying a deforming force with a master tool, characterized in that, in order to increase resistance by preventing the end exit of the macrostructure fiber to the surface of the working relief, before extrusion they melt and mechanically fine-tune the surface of the workpiece by applying a deforming force with a master tool.