SU845965A1 - Die for bending - Google Patents

Description

(54). STAMP FOR FLEXIBLE

one

The invention relates to the processing of metals by pressure, in particular, to the design of a die tool for bending.

A stamp is known for bending, in which the bending of the side shelves of parts is carried out by means of swinging semi-matrix. The stamp contains a bending punch, clamp, spring-loaded in the direction of the punch, bending elements (semi-matrices), hinged on the clamp, on the side of which the support wells 1 are installed.

The disadvantage of this stamp is that it is not possible to manufacture parts with bend radii of the side shelves and with the bend angles of these shelves in a wide range.

A chip mill for bending is known, in which the bending of the side shelves of parts is carried out by means of semi-matrix tilting inside. The stamp comprises a bending punch, the spring clamped towards the punch, tilting inside the semi-matrix, which are held in the upper position by means of fingers, which are under the action of

springs, the force of which is greater than the force required to fold the side shelves of the parts 2.

However, on this stamp it is not possible to manufacture parts with hem angles) quietly in a wide range of shelves. It is possible to bend parts of the V-shape on it only with the effort of bending less effort of preliminary tension of the springs.

A known stamp for bending, containing

fixed on one of his plate punch zn and

to mounted on another plate; punch-pinch-cling and mounted

with the possibility of plane-parallel g movement in the plane of the semi-matrix are flexible.

The semi-matrices are spring-loaded in the direction

opposite to the working course, pug nso15 by 3.

The disadvantage of this design lies in the impossibility of bending the parts, which require the efforts of the bending, greater force of the preliminary tension of the springs supporting the semi-matrix.

20

The purpose of the invention is to provide the possibility of bending with effort, great effort

compressing the springs holding the half

trinity in the original position.

For this purpose, in a stamp containing a punch fixed on one plate and mounted on another plate a clamp spring-loaded to the punch and installed with the possibility of plane-parallel movement in the plane of the flexible semi-matrix, equipped with return springs, with an abutment in contact with the facing to it the side surface of the clamp, while the latter is made stepped with a lower step, located on the side of the working end of the clamp.

FIG. 1 shows the chip at the moment of contact of the punch with the stamped workpiece, general view; in fig. 2 - working parts shchampa, plan view; in fig. 3 - at the end of the working stroke, general view.

The stamp contains a flexible punch 2 mounted on a vertical plate 1 with an undercut on the part configuration and shoulders 3 for acting on the semi-matrix 4. Under the stop bar 5 on the bottom plate 6 a holder 7 is mounted, in which the flexible semi-matrix 4 having corresponding sloping grooves are placed sleeves 7 protrusions 8. A slot 9 is placed in the slots of the semi-matrix 4 for fixing the workpiece. The working surface of the semi-matrix 4 together with the upper surface of the clamp 10 corresponds to the working surface of the bending punch 2. In the bottom plate 6 under the semi-matrix 4 there is a support element 11, which is a two-stage cylinder, the upper part of which has a protrusion 12 entering inside the yoke 7 along the landing fit . In the center of the support element 11, a hole 13 is made to accommodate the lower part of the clamp 10. In the cavities of the element 11 springs 14 and 15 and a threaded plug 16 are placed. Limiter 17 serves to fix the moment of undercut when adjusting the stamp. The semi-matrices 4 are provided with stops 18, which contact cq with a stepped side surface 19 of the clamp 10, while a smaller step 20 is located on the side of the working face of the clamp.

Stamp works as follows.

In the initial position of the semi-matrix 4 are in the upper diluted position. The distance between the bending edges of the semi-matrix 4 in this position provides the first stage of the product bending. The first stage of bending begins after the bottom plane of the punch 2 touches the workpiece laid on the presser Yu and the semi-matrix 4 between the stencils 9. During the first stage of the bending, the movable semi-matrices 4 remain in their original position, as their proximity is prevented by the clamp 10 and partially supporting element 11. The first stage is flexible until the shoulders 3 of the punch 2 come into contact with the half-mat, they are 4. By this time the clamp 10 is lowered so that the stops 18 of the semi-matrix 4 come out of contact with the larger step of the pressing surface 10 Then begins the second stage bending. The shoulders 3 of the punch 2 click on the half-matrix 4 and the latter close together. A smaller step 20 of the clamp 10 fixes the position of the semi-matrix 4 at the end of the bending. When the punch 2 rises up the semi-matrix 4 under the action of the springs 14 returns to its original position, until it stops against the stop bar 5. After the semi-matrix 4 stops in the upper position, the movement of the punch 2 with the product upwards is accompanied by the movement of the clamp 10 due to the action of the springs 15 to its upper position . Removal of the product from the punch 2 is carried out, for example, with tweezers.

On the proposed chip, it is possible to manufacture parts with different radii and angles for bending the side shelves, including parts requiring flexing forces, greater effort of preloading the under-, spring-loaded semi-matrix springs.

Claims (3)

1. USSR author's certificate number 430919, cl. B 21 D 7/02, 09.11.72. 2. Ehler, Kaiser. Cutting, bending and exhaust shtampy. M., 1961, p. 158, FIG. 145. 3.Mesterin V.T. Listova Shtampovka. Atlas of schemes. M., 1975, p. 90, fig. 207 (prototype).