SU1162522A1 - Method of forming ribbed parts having curvilinear surface - Google Patents

Abstract

A process for forming ribbed parts with a curvilinear surface, concludes with fixing the workpiece along the side surfaces in the areas free from beads, between the drawers, and the drawers. deformation of the material of the workpiece, characterized in that, in order to expand the range of products obtained, the workpiece with the ribs is made of a buckle, and the tool is made of elastic metal Skogen sheet material is deformed prior to fixation in the form of the latter. 9 k / .1

Description

The invention relates to the processing of metals by pressure, in particular, to methods of forming finned monolithic panels with heating, and can be used in aircraft and shipbuilding. The purpose of the invention is to expand the range of the obtained products by providing the possibility of obtaining panels of the type spun plane. FIG. 1 shows a device for implementing the proposed method of vtsd on top; in fig. 2 shows section A-A in FIG. 1 (after fixing the workpiece clamps); in fig. 3 - the same, after shaping; in fig. 4 is a section BB in FIG. 1 (after shaping). The device for forming panels comprises flexible elastic matrix 1, a punch 2 and clamps 3, made, for example, in the form of staples. The die 1 and the die 2 are made in the shape of the part to be made from a sheet with a thickness of 0.8-1 mm. The material of which the matrix and the punch are made should possess high strength and elastic properties and retain these properties at high temperature. These requirements are met by highly durable stainless steels, such as VNS-2. The mechanical properties of this steel at a temperature of 20 ° C are tensile strength (l40 kg / mm, yield strength 6s 130 kg / mm, modulus of elasticity E 19,000 kg / mm; at 6g 115 kg / mm, 5,100 kg / M E 17,000 kg / The punch blank of panel 4 is placed on the die 1, and the punch 2 is placed on top and clamps 3, made for example in the form of staples, are clamped on the side surfaces on areas free from ribs, between the punch and the die. At the same time, the flat ribbed billet elastically deforms the flexible punch and matrix, straighten them. Then the device is installed in the furnace and heated to plastic deformation temperature, the time required for ensuring uniform heating of the workpiece is maintained at this temperature. At the plastic deformation temperature of the panel blank, the mechanical properties of the workpiece material are significantly reduced, while The matrix material retains its strength and elastic properties. As a result of reducing the stiffness of the workpiece, the external load on the die decreases and the die, restoring its original shape, plastically deforms the workpiece to obtain a part of the required shape. At the end of the deformation process, the device is pushed out of the furnace, cooled to room temperature, the clamps 3 are released, the punch 2 is removed, and the molded part is removed from the die 1. Example. According to the proposed method, parts having the shape of a surface like a twisted plane are manufactured. The 01420 aluminum alloy panel blank is a ribbed Ixbxh plate (fin height) 1000x500x20 mm. The longitudinal ribs (4 pieces) are located with a step across the width of the panel of 100 mm, the thickness of the blade and the edges of the panel 2 mm. The panel blank is placed on the die, a punch is placed on top and the workpiece is clamped along its side surfaces in the areas free from the ribs, between the punch and the die. At the same time, the flat ribbed workpiece elastically deforms the flexible punch and die, and their tension. Then the device is installed in the furnace and heated to the temperature of plastic deformation of the panel material. . For alloy 01420, the temperature of plastic deformation is maintained at this temperature for 30 minutes. At the same time, the strength of the material of the workpiece is reduced to 6 2.5 kg / mm, the yield strength is up to 6 d 1.6 kg / mm, while the matrix made of ANS-2 material has a tensile strength of 15 kg / mm, yield strength s, 100 kg / mm, modulus of elasticity E 17000 kg / mm. In the process of heating and holding at the temperature of plastic deformation of the material of the billet, the matrix, previously deformed by an elastic billet, restores its original shape (

details) and in turn deforms the workpiece, giving the latter the desired shape.

The shape of the manufactured part is monitored by sectional templates, deviating from the template sectional contour is measured with a probe in six sections along the length of the workpiece every 200 mm, starting from the edge of the workpiece.

Deviation of the shape of the manufactured part from the sectional contour of the template

within the limits of the technical specifications

delie

The method allows to expand the range of manufactured parts by allowing parts such as a twisted plane to be obtained without using specialized equipment, since it requires only a heating device and tooling for its realization — sheet punch and die made of high-strength steel.

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Claims (1)

METHOD FOR FORMING RIBBED PARTS WITH A CURVED SURFACE, which consists in fixing the workpiece on the side surfaces in areas free from ribs, between the parts of the deforming tool, made in the shape of the product, and subsequent heating of the workpiece together with the tool to a temperature range of hot plasticity of the workpiece material, which differs the fact that, in order to expand the range of products obtained, a blank with ribs is made flat and the tool is made of elastic metal sheet about the material and before fixing it is deformed in the shape of the latter. 1 162522