SU759171A1 - Apparatus for pressing hollow articles - Google Patents

Description

The invention relates to the processing of metals by pressure and can be used in the manufacture of thin-walled shells with a curved generatrix. . .

A device for pressing hollow articles' is known, containing a matrix in which on one side there is a stamp, and on the other, the head J0 of a needle located outside the matrix and coaxial with it [Ϊ].

However, the ubiquitous device allows to obtain hollow tubular parts only with cylindrical walls. fifteen

The purpose of the invention is the provision of the possibility of obtaining hollow parts with curved walls during pressing in conditions cBepxnnacTH4HOOTH.

For this, the device is equipped with a concentric needle mounted with the ability to move along it synchronously with the movement of the stamp with a detachable sleeve, on the end of which a ring groove is made on the matrix side with a diameter corresponding to the diameter of the product extruded from: the matrix, a. the needle is made with 1 axial radial holes connected with the source of supply of hot deforming medium to the cavity of the pressed product.

In FIG. 1 shows a device at the beginning of deformation of a workpiece; in FIG. 2 - at the time of completion.

c. The device contains a die 1 fixed in the housing 2. A die 3 is inserted into the die on one side and a needle head 4 is formed on the other. An annular gap is formed between the needle head and the die through which the workpiece 5 extrudes under the action of the die 3. On the needle with the possibility of moving along it is a detachable sleeve 6. At the end of the sleeve from the matrix side there is an annular groove 7. On one side of the groove an entry cone is made. The material extruded through the gap between the matrix 1 and the needle 4 flows into the groove 7 of the sleeve 6, which, by means of the rods 8, begins to move with the expiration speed of the extruded semi-finished product 9. At the same time, pressure is applied to the inner surface of the semi-finished product 9, which can be created by a gas or liquid medium supplied through available axial and radial holes in the needle. Seals 10 and groove 7 provide the necessary sealing of the semi-finished product cavity. Under the action of internal spacer pressure on the semi-finished product and compressive forces on the workpiece, a shell with a curvilinear generatrix is obtained.

Deformation is recommended for double-acting hydraulic presses.

The economic efficiency of the device is ensured by expanding technological capabilities and reducing the complexity of manufacturing the shell.

Claims (1)

Claim A device for pressing hollow articles containing a matrix in which on one side there is a stamp _; and on the other, the head of the needle, located outside the Boosno matrix with it, is different in that, in order to obtain products with a curvilinear generatrix during pressing under superplasticity, it is equipped with a concentrically mounted needle with the ability to move along it simultaneously with the movement of the stamp with a detachable sleeve , on the end of which from the matrix side there is a ring groove with a diameter corresponding to .Q the diameter of the product extruded from the matrix, and the needle is made with axial and radial holes communicated with chnikom deforming the hot medium in the cavity is extruded product.