SU871900A1 - Method of producing large size bottoms - Google Patents

Description

one

The invention relates to the treatment of metals by pressure, in particular, to methods for manufacturing large-sized bottoms.

There is a known method of manufacturing thin-sheet metal bottoms, in which the blank is first stamped in accordance with the curvature of the diaphragm in a spherical chip having small working surfaces compared to the entire bottom area. The stamping is performed sequentially section by section 1.

The disadvantage of this method is low productivity, since stamping is performed at low degrees of deformation due to the probability of folding the peripheral areas of the workpiece.

A known stamp is the manufacture of large-sized bottoms, which includes forming the preform into sections, followed by stretching to final shape. The average degree of deformation increases from the edge of the workpiece to the center, and deformation also leads from the periphery to the center 2.

This method is also characterized by low productivity, since the peripheral parts of the workpiece need

deform with large overlaps and with insignificant degrees of deformation, which is associated with the propensity of the billet to fold when formed.

The purpose of the invention is to increase productivity.

This goal is achieved by the fact that according to the method of manufacturing large-sized bottoms, including forming the blank into sections followed by stretching to final shape, 10 the forming process starts from the central portion of the blank, which is immediately shaped into the final shape, and then to the periphery in a spiral.

FIG. 1 shows a device implementing the proposed method, a longitudinal section; in fig. 2 is a diagram of the location of deformable portions by area of the blank.

The device contains a matrix 1 mounted on a press table (not shown) and

20 mounted in a press slide (not shown) coaxially with die 1 punch 2.

The method is carried out as follows.

The workpiece 3 is set between the punch 2 and the matrix 1 coaxially with them, deform the central part of the workpiece, which is immediately given the final shape. After that, the workpiece is moved in the horizontal plane relative to the punch 2 and the die 1 by a certain amount depending on the amount of required overlapping of the deformed sections and the workpiece 3 is formed by the same punch 2 and the die 1, turning the workpiece 3 around its axis before each pressing of the punch 2 on the corner providing necessary overlapping. After the entire ring area is compressed, i.e., when the workpiece 3 rotates by 360 °, the center 3 of the workpiece 3 is further moved relative to the die 2 and the punch 1 and the next ring portion of the workpiece 3 is formed. Thus, the stamping is performed from the center spiral, preformed. The molded preform 3 is subjected to drawing without pressing in a chip of known construction.

Thus, due to the large successive cuts of the blank areas, the required shape of the products is obtained in a smaller number of punch strokes (approximately

for 1/3). Due to the fact that the central part of the preform is deformed, the folding of the peripheral parts is reduced, which also allows for more intensive compression.

Claims (2)

1.Moshnin E.N. Bending, closing and editing on presses. M., Maschgiz, 1959, p. 83 2. Development of a typical technological process of manufacturing bottoms. Technical 25 report VNIIKMASH, inv. No. T-278-64, 1965, p. 4-7 (prototype).