SU1496865A1 - Arrangement for expanding tubular billets - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular, to the distribution of elastic medium, and can be used in various parts of the engineering industry in the manufacture of hollow parts from tubular blanks. The purpose of the invention is to simplify the design and increase its reliability. The elastic punch 3 is compressed under the action of the rigid punch 2. The pressure required to form the workpiece 10 develops. At the same time, the buffer 4 is compressed. The pressure ring 6 and the pusher 9 are moved by the rods 8 by the value Δ L. The value Δ L is determined by the height of the buffer parts L ₁ and L ₂ , as well as movement of the hard punch Δ N. This ensures guaranteed movement of the end of the workpiece also by the value Δ L. At the same time, buffer 4 is used to prevent disclosure of semi-matrix 5. 2 Il.

Description

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The invention relates to the processing of metals by pressure, in particular to the distribution with an elastic medium, and can be used in various fields of mechanical engineering in the manufacture of hollow parts from tubular blanks.

The purpose of the invention is to simplify the design and increase its reliability.

1 shows the proposed device, the initial (left) and working: (right) position; FIG. 2 is an example of a moldable part

The device consists of a pressure upper plate 1 of the stamp, on which a rigid punch 2 is fixed, and interacting along the end with an elastic punch 3. A circular buffer 4 is attached to the upper plate of the first stamp 1, the other end of which interacts with one of the detachable Matrix.5 The ring buffer is divided into two parts by the pressure ring 6 and is mounted on the disk 7 with a hub, and the pressure ring 6 is interconnected by means of uniformly located around the through holes of the disk 7 by the rod 8 with the pusher 9.

The device works as follows;

After placing the workpiece 10 and closing the semi-matrix 5 with further movement of the top plate of the stamp t. The elastic punch 3 is compressed under the action of the rigid punch 2, developing pressure required to form the workpiece 10, while moving the top plate of the stamp 1, the buffer 4 is moved, moving the pressure ring 6 and the pusher 9 through the rods 8 by the amount Db, determined by the height of the parts of the buffer 1. and Ig, as well as the movement of the hard punch JN

L L U.H t 1 1

(one)

what provides guaranteed

the movement of the end of the workpiece is also on the value of DB. At the same time, buffer 4 is simultaneously used for

. preventing the opening of the junction of the matrices 5 The latter determines that

 that its rigidity is much greater than the rigidity of the workpiece in the axial direction, i.e. relation (1) is exact.

Example. The adapter is molded from a billet 0 50x1.0 of 12X18H10T stainless steel with the geometric dimensions indicated in FIG. .

The displacement of the end face of the workpiece Lj, which provides an adapter with a minimum thickness variation, is determined from the equality of the areas of the middle lateral surfaces of the workpiece and the part:

L AgrI 2u Ubfi r SABT

D "

 AUG 13 mm.

where DO is the median diameter on top

the availability of the workpiece; Bdeg - height of the part.

Moving the butt-elastic punch, providing its cushioning pressure during deformation on the inner surface of the bale, we find from the condition of equality, the volume of the part of the elastic punch being moved from the end, the volume of the molded cavity of the 4V, considering in the first approximation the material of the elastic punch is incompressible:

 "(Mm)

where D, is the internal diameter of the workpiece

From the above calculations it can be seen that the movement of the end of the workpiece during the deformation should lag behind the movement of the end of the elastic punch so that by the end of the process they correspond to values of 13 and 24 mm.

According to the invention, the provision of a predetermined displacement of the end face of the elastic punch and H displacement of the end face of the workpiece a L is determined by selecting the heights of 1 and 1 parts of the buffer so that

LN

L

1 0.84.

Claims (1)

Invention Formula A device for tube billets containing a fixed split matrix with a working cavity, a hard stepped punch. connected with a movable plate and interconnected with an elastic punch, a pusher enclosing a rigid punch interconnected with a movable plate by means of an intermediate node and installed with the possibility of entering the working cavity of the die, in order to simplify the design and increase its reliability, the intermediate node is made in the form of a disk-; with a hub, covering large a step of a rigid punch and a uniformly spaced through holes of through-holes, rods installed in the aforementioned holes, as well as an annular elastic buffer divided into two parts by means of a pressure ring and installed between the movable plate and the disk, while the rods are interoperable with push ring and pusher