SU1224082A1 - Die for isothermal backward extrusion - Google Patents

Description

The invention relates to a device for the treatment of metals by pressure, in particular to isothermal deformation, and can be used for the manufacture of pulverized hollow parts.

The purpose of the invention is to improve the quality of the products obtained,

The drawing shows a stamp, a vertical section (on the left — at the moment of the start of the extrusion process; on the right — at the end of the extrusion process).

The stamp comprises a matrix 1., an ejector 2, a punch 3, a guide bushing with a flange 4, a ring 5 with an internal protrusion 6, and a plastically deformable element 7 in the form of a ring.

The stamp works in the following way.

The heated initial billet 8 is placed in the matrix 1 on the ejector 2. Then the guide bushing 4 is inserted into the matrix 1, the guide ring 5 having a protrusion 6 on the inner surface is installed onto it, together with the plastically deformed conical element 7. Dp preventing the element 7 from setting with the sleeve 4 and the punch 3, the element 7 is covered with a layer of boron nitride. At the beginning of the press or at some given moment in the process (depending on the composer V. Beschekov Editor L. Pchelinska Tehred I. Popovich Corrector M. Samborska

1868/12

Circulation 655 Subscription VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, F-33, Raushsk nab., 4/5

Branch ShSh Patent, Uzhgorod, st. Project, 4

from the moment the back pressure is necessary) the punch 3 with its conical surface presses the plastically deformable element 7 from above,

At the same time, the upper end of the clamped workpiece 8, lifting, presses on the guide sleeve 4, and the latter in turn, with its conical flange surface, presses the element 2, which is plastically formed 1) 7, which thus plastically deforms and at the end gaining its original shape

and occupies the position shown in the drawing to the right of the axis, i.e. a position symmetrical to the original relative to the mid-plane of the guide ring 5, which prevents the outer diameter of the element 7 from moving. After the return stroke of the punch 3, the extruded product, the guide sleeve 4 and the ring 5 and the plastic conical ring 7 are raised by the ejector 2. When the next product is pressed the guide ring 5 together with the element 7 is turned over by 180, the ends are exchanged. The transfer of the element 7 to a thickness less than the initial one is prevented by an annular protrusion on the inner surface of the guide ring 5.

Claims (2)

1. A STAMP FOR ISOTHERMAL REVERSE EXTRACTION, containing a die, punch, ejector, and a guide element, characterized in that, in order to improve the quality of the products obtained, the stamp is equipped with a plastically deformable element, the guide element is made of a hollow sleeve with a flange in the form a hollow truncated cone, facing a smaller base to the matrix, and a ring with a protrusion on the inner surface, placed on the side surface of the flange with a gap to the side surface of the punch, while plastic and the deformable element is placed in the specified gap. 2. The stamp according to claim 1, characterized in that the plastically deformable element is made in the form of a hollow truncated cone, facing a smaller base in the direction of the punch and installed with the possibility of interaction with the protrusion of the specified ring.