SU1750808A1 - Method of making hollow articles with thick bottom - Google Patents

Abstract

Use: making hollow articles such as glasses with bottom thickness greater than wall thickness by punching with rolling. Bar stock is placed in a container, squeezed with a punch into the rolling matrix until a central thickening is obtained, which is equal to the missing volume of the bottom of the product. An extrusion with a thinning produces the necessary wall thickness; a central thickening is formed by a punch to obtain a different bottom shape, and the central thickening is partially separated. 1 з п. Ф-лы, 5 Il.

Description

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The invention relates to the processing of metals by pressure and can be used in the manufacture of hollow billets such as glass, with a bottom thickness greater than the wall thickness, by forging.

The purpose of the inventions is to reduce the labor intensity of manufacturing products by reducing the number of stretching transitions with thinning and chemical heat treatment, as well as expanding the technological capabilities by obtaining products with different bottom shapes.

FIG. 1 shows schematically the extrusion of a bowl with a central thickening according to the invention; in fig. 2 - product after stretching with wall thinning: in FIG. 3-5 are examples of hollow products with a thick bottom of various shapes.

The method is implemented as follows.

The original bar stock 1, the diameter of which is smaller than the diameter of the finished product. Installed in the container 2 A pusher 3 is placed inside the container. When the press is turned on, the container 2 moves down towards the rolling matrix 4. The container 2 reaches the stop 5 and stops. In this case, a gap is formed between the end surface of the container 2 and the matrix 4, which regulates the thickness of the bottom and walls. After that, the workpiece 1 by the pusher 3 begins to be squeezed out into the matrix 4. The metal flows intensively in the radial direction and under the action of the radius and side surface of the matrix changes the flow direction to axial. The result is a bowl 6 with the same wall thickness and bottom of the finished product. equal to the missing volume of the bottom of the product, does not deform and remains in the container in the form of a central thickening. Then, in another stamp, the wall of the bowl is thinned to a thickness equal to the wall thickness of the product. Then,

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the central thickening is precipitated with an anson, the thickness of the bottom is needed, the central thickening of the metal is not the final stage of the product, which expands the technological possibilities of the method, since the central thickening can be partially precipitated and thus a different shape of the bottom of the product is obtained.

The method was tested in the manufacture of hollow products from aluminum alloy AD1. A bar stock with a diameter of 50 mm was squeezed into a rolling matrix before a bowl with a central thickening was obtained. The outer diameter of the bowl was 120 mm, the wall and bottom thickness was 6 mm. In one transition of drawing with thinning, the wall was thinned up to 3 mm. A central thickening was formed by sediment to a bottom thickness of 8 mm. When the bowl was prepared in a known manner with a wall thickness and a bottom of 8 mm, the number of thinning transitions to obtain a product with a wall thickness of 3 mm was two.

The testing was carried out on a hydraulic press with a force of 3000 kN, equipped with a special mechanism for rolling the matrix with a frequency of 500 oscillations per minute and a special hydraulic actuator for feeding the workpiece. The formation of the bottom by sediment was carried out using a rolling matrix according to a scheme similar to the bowl extrusion scheme.

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Compared with the known method, the proposed method allows reducing the number of drawdown transitions with thinning and intermediate chemical-heat treatment operations, as well as expanding the technological capabilities by obtaining products with different bottom shapes.

Claims (2)

1. A method of manufacturing hollow products with a thick bottom, including placing a bar stock in a container, extruding a punch into a rolling matrix before making the bowl, deforming the wall of the bowl with a thinning, decorating the bottom of the bowl, characterized in that, in order to reduce the labor intensity of manufacturing by reducing the number of transitions of the extrusion with thinning and chemical-heat treatment, the extrusion of the bowl leads to the thickness of the bottom and walls, less than the thickness of the bottom of the finished product with the formation of a central thickening, the volume of which The second is equal to the missing volume of the bottom of the product, and the design of the bottom of the bowl is made by punching up a central thickening formed. 2. The method according to claim 1, characterized in that, in order to expand the technological capabilities by obtaining products with different bottom shapes, the central thickening is partially precipitated x2 FIG. Pg.2 / HH U / TA I'm 4