SU871983A1 - Closed die - Google Patents

Description

one

The invention relates to the processing of metals by pressure, in particular to closed stamps.

Known closed stamp containing the punch and the matrix made on them, respectively, each other groove and the protrusion Cl.

The disadvantage of this closed die is the low quality of the finished product.

The purpose of the invention is to improve the quality of the finished product.

This goal is achieved by the fact that in a closed stamp, with a punch and a die with a groove made on them and a protrusion corresponding to it, an additional groove and a protrusion matching the groove and a protrusion at an angle of 90 are made on the punch and the die, and the engraving of the die is inclined to the protrusions of the stamp in two mutually perpendicular directions, with the angles of inclination of the stamp engraving being as follows

, 43 sj; , 43 | ,

where o (, ft are the angles of the stamp's grag in two mutually perpendicular directions;

deformed area

AND

product-in plan;

side area

products;

face area

1GI

products.

1 shows a stamp in FIG. notation, general view; in fig. 2 is a section A-A in FIG. one; in fig. 3 10 section bb in fig. one; in fig. 4, the scheme of action of forces, in the case of deformation.

The stamp consists (Fig. 1) of the matrix 1 and the punch 2, in which engraving 3 is made. On the left and back of the engraving 3, protrusions 4 and 5 are made on the matrix, arranged to each other at an angle of 90, and on the right and

20 of the front sides are made similar protrusions 6 and 7, which, together with the projections 4 and 5, form a closed loop around the perimeter of the engraving when the stamp is closed, and engraving 3 is 25 25 on the stamp inclined to the projections in two mutually perpendicular directions, which ensures a tight fit of the projections in pairs to each other during deformation, for.

Claims (1)

30 due to the fact that the punch tends to shift relative to the matrix along the inclined plane of the engraving. The stamp works as follows. When the press ram moves down, the protrusions 4-7 of the punch 2 and the die meet in pairs and, moving / relative to each other, form, together with engraving 3, a closed cavity. Upon further movement of the slider down the punch 2 after meeting with the workpiece (Fig. 2 and 3) Begins to deform the last. Under the action of force P press SF. 4), which on the inclined plane of the engraving is decomposed into a force P, which deforms the metal due to holding protrusions 4, 5 and 6, 7 points 2 and matrix 1 along cleavage planes to each other, a force of deformation of the metal Q appears and the lateral pressure force on the wall of the protrusions Pjj-, which tends to force the protrusions of the punch and die apart. To prevent this from happening, the force p2 must be equal to or exceed the force during the entire deformation process, i.e. R or R-S05CH; Pj-; $: P where ot, 6 are the angles of inclination of the stamp engraving to the plane of the connector in two mutually perpendicular directions. It is established that the ratio of low forces from lateral pressure to protrusions (Pg-) and from deformation resistance (P) for parts with elongation The blade type axis is 0.7. Then, taking into account the projection of the deformable workpiece onto the corresponding walls of the protrusions, for a cross section, a Goavuon 0.7 or S Sj ,, p-sin Sj is the area of the deformed product in plan; Sjj- is the area of the side of the product. Hence tg (iXL, 43 1. d for the longitudinal section of the engraving P-COS Sn 0.7, P, SI p S S where 5 is the area of the front side of the product. Hence, tg ,, 43 | nd. For these values x double angle of inclination, force Rl, which presses the protrusions of the punch and the die, is always greater than the lateral pressure force of metal P, which ensures that the protrusions are tight to each other during deformation. During the return stroke of the slide, the punch and matrix return to the original position and free removal stamp forgings. Thus, due to the projections that are made unpairedly mating at an angle of 90 to each other on the punch and the matrix and located on opposite sides of the engrave, as well as inclination at the plane of the connector in two mutually perpendicular directions, a force arises during deformation, which presses the protrusions of the punch and die to each other It provides a snug fit during deformation, prevents the formation of a burr around the entire perimeter of the product, thereby improving the quality of the product and the durability of the stamp. The use of a stamp with an inclined engraving with respect to the protrusions for stamping elongated workpieces, for example, GTE blade blades, improves durability of dies by 2-3 times, improves the quality of pokovo and avoids additional production costs for eliminating slotted burrs, and salim to increase productivity. Claims of the invention: A closed die containing a punch and a die with a groove and corresponding protrusion thereof, o. in order to improve the quality of the finished product, an additional groove and a protrusion are made on the punch and the die, matching with the said groove and the protrusion at an angle of 90 °, and the engraving of the stamp is made oblique to the protrusions of the stamp in two mutually perpendicular directions, wherein the angles of inclination of the engraving are in the following relationship where d, f are the angles of inclination of the engraving of the stamp in two mutually nifppendicular directions; the area of the deformed product in the plan; side area of the product; the area of the end side of the product. Sources of information taken into account during the examination 1. US Patent No. 3905220, cl. B 21 D 37/00, 16.09.75.