SU804102A1 - Die for undercutting and folding tap - Google Patents

Description

(54) STAMP FOR CUTTING AND BENDING PETAL

one

The invention relates to a tooling for cold sheet forming and can be used in mechanical engineering for cutting and bending in details of petals, legs, etc.

Punches are known for notching and bending petals at an angle of 90 ° in flat parts, in which notching and bending are performed in one stroke of the press ram. At the beginning of the working stroke of the press, an incision is made by a punch; upon further lowering of the press ram, petal 1 is folded over.

The closest technical solution to the proposed is a die for notching and bending the petal, containing a punch with a beveled cutting edge, a die and a covering punch, a spring-loaded puller 2.

The disadvantage of these stamps is the formation of tears along the edges of the outer surface of the bend when processing parts with a material thickness greater than 0.4-0.5 mm.

The purpose of the invention is to eliminate this drawback.

To this end, the stamp is equipped with knives, made in the form of pointed protrusions of the puller, located along the notch line.

FIG. 1 shows the proposed stamp

at the end of the working stroke, general view; in fig. 2 5 section A-A-, in FIG. one; in fig. 3 - view

on top of the puller; in fig. 4 - section

BB in FIG. 3

The proposed stamp contains a punch 1 with a flat cutting edges 2, mounted in the punch holder 3 on the base 4, the matrix 5, in which the ejector 6 is installed, working from the rocker arm (not shown) of the slide and the puller 7, made with two knives 8 in the form of pointed protrusions located along the line of the notch of the petal, interacting through the pushers 9 with the buffers 10.

The stamp works as follows.

The part 11 is mounted on the puller 7. When the working parts of the stamp (Fig. 1) are closed, the matrix 5 presses the part 11 to the spring-loaded puller 7. At the same time, the puller blades 8 cut into the metal, and as the matrix 5 and puller 7 are further lowered, the part petal is cut edges 2 punch 1

and bending the petal of the part at an angle of 90 °. During the reverse course of the slide under the action of the buffer 10, the puller 7 removes the part 11 from the punch, and the ejector 6, acting from the rocker of the slide, pushes the part out of the matrix 5.

The proposed stamp, in comparison with the known one, makes it possible to obtain an incision and bending of the petal at an angle of 90 ° in one transition without tearing the metal in the bending zone on parts with a thickness greater than 1.0 mm.

Claims (2)

1.Smirnov-Al. G. A., Weintraub D. A. Kholodna Shtampovka in Instrument Engineering. M.-L., 1963, p. 114, FIG. 51. 2. Misterin V. T. Listova Shtampovka. Atlas of schemes. M., 1975, p. 150, fig. 418 (prototype).