SU1348048A1 - Method of producing moulded articles - Google Patents

Abstract

The invention relates to the processing of metals by pressure and can be used in the manufacture of extruded large-sized semi-finished products. The purpose of the invention is to increase the productivity of the process of manufacturing press articles by maintaining torsional precipitation. This leads to a reduction in the number of sludge and stretch operations. The original billet height upset with torsion in one direction by the amount of 0.2ND. After that, the torsion direction is reversed and precipitated to a height of 0.4ND, turned over to the generator and stretched to a square with a side equal to 0.90. After the end of the process, the sequence of operations is repeated. Increasing the productivity of the manufacture of press products is carried out without reducing quality and increasing labor intensity. 6 Il. (5 (L with 4 00 O 4 00

Description

The invention relates to the processing of metals by pressure and can be used in the metalworking industry in the production of pressed large-sized semi-finished products.

The purpose of the invention is to increase the productivity of the process of manufacturing press articles by maintaining torsional precipitation while reducing the number of slump and drawing operations.

FIG. 1 is a schematic representation of the pre-and post-precipitation billet with torsion in FIG. 2 - the same, before and after the stretch; in fig. 3 - the same, before and after precipitation with torsion - in figure 4 - the same, before and after stretching; in fig. 5 - the same, before and after stretching, in FIG. 6 - the same, after running.

The initial billet with a height of HQ 2Do (DO is the diameter of the original billet) is heated and upset with torsion in one direction by an amount equal to 0.2 Nd, after which the torsion direction is reversed and upset to a height of 0.4 ND, then the billet is turned over onto the generator and carried out on a square with a side equal to 0.9 of the diameter of the initial billet. Intermediate billet, obtained after stretching to a square, is deposited with torsion as in the previous draft and is turned over onto the generator with subsequent drawing to a square from the side equal to 0.9 of the diameter of the initial billet, with the longitudinal axis of the square perpendicular to the original axis of the original billet.

Subsequent technological operations of torsional precipitation and broaching are performed similarly as previously performed, and the number of such repetitions is determined by the quality requirements of the products. After the last precipitation with torsion, the intermediate billet is turned over onto the generator and stretched per square, followed by rolling on the diameter required for pressing. The imposition of an additional shift due to twisting during upsetting increases the intensity of deformation and makes its distribution uniform, thereby contributing to a more uniform distribution of excess phases in the volume of the alloy. The change in direction is steeper480482

Neither during the precipitation process does it crush the inclusions of insoluble phases and grain sizes in aluminum alloys, and in the aggregate, all this leads to better melting and reduces the amount of precipitation and stretch.

Example. The method was tested on

1Q samples of aluminum alloy AK 4-1, vacuum-treated. Heated up to 400 ° C, samples with a size of 100x200 mm are forged with two precipitations with torsion and two broaches per

15 press the PSU-500 with the lower rotary table. Initially, they are upset by the amount of 40 mm with the table rotating clockwise, and then they are upset to a final height equal to

20 50 mm with counterclockwise rotation. Then, the upset preparation is turned over onto the generator and drawn onto a square with a side of 90 mm. The operation of precipitation with torsion in opposite directions with the same values of reductions and stretching is repeated. At the end of the running-in operation, a blank is obtained for pressing with a diameter of 85 mm and a length of 250 mm. The jPoTHoe device is equipped with an electromechanical drive, which during the upsetting process with torsion produces a constant predetermined rotational speed of the lower striker with a change in its direction.

The proposed method for manufacturing press articles from aluminum alloys makes it possible, by reducing the amount of sediment and continuously increasing the productivity of the process of manufacturing products from these alloys, without reducing quality and increasing labor intensity.

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Claims (1)

Invention Formula A method of manufacturing aluminum alloy products, which consists in heating the billet, preliminary deforming it by alternating slumping operations and drawing successively in perpendicular directions, running, and subsequent pressing, in order to increase the productivity of the process by reducing the number of sludge and draw operations, during the slump process, the workpiece is twisted with a change in direction. Fi.G fic.g Fi.Z Ft ff FIG. five Phy, In Compiled by N.Timofeeva Editor S.Lisina Tekhred L.Serdyukova Proofreader A.Obruchar Order 5145/9 Circulation 582Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4