SU995986A1 - Bending die for producing brace-like parts - Google Patents

Description

(5k) FLEXIBLE STAMP TO GET CONNECTED

DETAILS

The invention relates to the processing of metals by pressure, in particular to dies for sheet cold forming. Bending stamps are known for obtaining skE-shaped parts containing a punch, a matrix and mounted in a matrix with the possibility of reciprocating displacements of a spring-loaded pusher. . Stamps are known for compensating for the vertical retention of the vertical shelves. These stamps contain a sub-leg. reedy punch, spring-loaded ejector and two sections, dies, mounted for horizontal movement and in contact with two wedges attached to the top of the stamp | 2. The disadvantage of these stamps is that they only compensate for the springing of a certain size, corresponding to the angle of inclination of the side surfaces of the punch and the die sections. Meanwhile, materials with enhanced elastic properties have a significant dispersion of elastic limit values and, accordingly, dispersion of spring angles for different batches of parts. In addition, the stamp design is cumbersome and therefore suitable only for bending parts of relatively small sizes from blanks with thickness up to about a, 8- 1 mm. A bending punch for obtaining U-shaped parts is known, comprising a punch, a spring-loaded ejector, a bottom plate on which two vertical supports are fixed and two matrix sections in contact with them 3995986 that are vertically mounted and spring-loaded. The supports and the surfaces of the matrix sections that are in contact with them are step-shaped, and the punch is equipped with shoulders, which at the end of the working stroke displace the sections of the matrix and ensure the compression of the part’s shelves in order to compensate them. spring backlash. The disadvantage of this stamp is that it is not possible to adjust the bend amount of the vertical flanges of the part to compensate for the spring angles according to their different values for different batches of parts, because the lateral tilt angles The x surfaces of the punch and the sections of the die are of the same value. The closest to the invention is a bending punch containing a punch, a matrix with rotatable sections in the plane of the sections, and an ejector installed in the matrix. On a plate bearing the matrix, the racks are fixedly attached to the cylindrical supporting surfaces with rotatable sections of the matrix Ss sec

However, on this stamp it is also impossible to adjust the amount of bending of the vertical flanges of the part to compensate for the springback, since the very small vertical movement of the punch and ejector corresponds to a significant angular movement of the rotary sections.

The purpose of the invention is to provide the possibility of adjusting the amount of bending of the shelves of a part when processing materials with different elastic properties.

The goal is achieved by the fact that in a die containing a punch, a matrix with sections rotatable in the plane of contact, contacting on cylindrical support surfaces with posts, fixedly connected to the plate carrying the matrix, as well as an ejector mounted in the matrix, the rotary sections of the matrix are installed with the ability to move in the direction of the stroke of the punch by the value of S 0.2 t-ctg -4- and is spring-loaded to the carrier plate, the centers of the cylindrical supporting surfaces of the uprights are shifted from facing to her and r where view Pua

move.

The stamp contains a punch 1, an ejector 2, at least one rod 3 of which is under the action of a buffer device (not shown), a lower plate k and a rack 5 to which the fixed sections 6 of the matrix are attached. Under them are placed the rotary sections 7 of the matrix, resting

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Claims (3)

on the pushers are about, under the action of springs 9, pressed by threaded plugs 10. At the ends of the rotary sections 7, the matrix sits t pins 11, the ends of which enter arcuate grooves provided in the plates 12 connecting the struts 5 (Fig. 3 and t). On the fixed sections 6 of the matrix, the workpiece 13 is located. The rotary sections 7 of the matrix are mounted with the possibility of movement in the direction of the working stroke of the die by the value of S 0,2-t-ctg - (Fig. 5). The struts 5 and the rotary sections 7 of the matrix are made contacting along cylindrical supporting surfaces, whose centers are displaced from the plane of the plate 4 facing the racks to the distance H h + (1 + 0.1 ctg -f-) t, the plane of the plate carrying the mat , over the distance H h + r „-n (1-Yu, 1 ctg -J-) t, adii of these surfaces are equal to H) h is the thickness of the ejector; the radius of the bending ribs of the punch; workpiece thickness; b is the thickness of the rotary section on the straight segment connecting the centers of the cylindrical support surfaces of the racks; P) is the maximum for the materials processed on the stamp, the angle of springback of the part shelves. FIG. 1 shows a stamp in the non-position, a cross-section; FIG. 2 - the same at the end of the working a; in fig. 3 - a half of the lower bowl, top view, in FIG. A in FIG. 3; in fig. 5- position of the nson, ejector and movable matrix in the middle of the working and the radii of these support surfaces are equal to R-. cig --- - (where h is the thickness of the ejector 2, the radius of curvature of the bending ribs of the punch 1; t is the thickness of the workpiece 13; b is the thickness of the rotary section 7 which is in the initial position in the straight section connecting the centers of the cylindrical supporting surfaces of the uprights 5; p is the maximum for the materials processed on the stamp of the springback of the shelves of the part 14. The stamp works as follows: The blank 13 (Fig. 1) is placed on the fixed sections 6 of the matrix and fixed by one of the known methods, for example, pins (not shown), on the ejector 2. During the working stroke, the punch 1 is lowered onto the workpiece 13, presses it against the ejector 2 and bends on the fixed sections. 6 matrices. When the side ledges of the ejector 2, the income t to the projections of the rotary sections 7, the latter begin to descend together with the ejector, turning opposite to the punch 1. In this case, the rotary sections 7 envelop the flanges of part 1 (FIG. 2) around the rounded edges of the punch 1 until the angle of rotation will be reached to compensate for the springback of the shelves. The magnitude of this angle is regulated by the limiting lower position of the punch 1 and, accordingly, ejecting the bodies 2 and. rotary sections 7 of the matrix and can be determined experimentally for each batch of parts. To simplify adjustment, plates 12 at the arc-shaped grooves, into which the ends of the pins 11 enter, can be marked with an indication of the angles to the vertical of the working surfaces of the rotary sections 7 with the corresponding position of one of the pins. When the press is reversed, the ejector 2 returns to its original position under the action of the buffer device (Fig. 1) and removes the finished part 14 from the die, and sections 7 are raised under the action of the pushers 8, and the screws 11 ensure their movement along the cylindrical supporting surfaces 5. The technical and economic effect created by the proposed stamp is to improve the accuracy of parts with a p-profile, made from materials with enhanced elastic properties (for example, D1b type alloys, titanium alloys) due to of increased thickness, in which the elastic limit of different batches may have a significant dispersion, which gives a large dispersion of angular dimensions due to the springing of the vertical shelves. In the proposed stamp, the springback compensation is produced by simple adjustment. the position of the punch in the bottom dead center, which reduces the complexity of the manufacture of brackets. DETAILED DESCRIPTION OF THE INVENTION A bending dies for obtaining staples, containing a punch, a matrix with rotatable sections in the plane of bending, contacting on a cylindrical support. with stays fixedly connected to the plate carrying the matrix, as well as an ejector installed in the matrix, which is different in that in order to be able to adjust the amount of bending of the shelves of the part when processing materials with different elastic properties, the rotary sections of the matrix are installed with the ability to move in the direction of the stroke of the punch by an amount of 2tCtg and is spring-loaded to the plate bearing them; the centers of the cylindrical supporting surfaces of the racks are offset from the plane of the plate facing them, the matrix itsu, at a distance. . H h + g «+ (1 + 0,1 ctg) .t, and the radii of these surfaces are equal to r - | 7C-Lg4 - - i), where h is the thickness of the ejector p - radius of the bending ribs of the punch; t is the thickness of the workpiece; b is the thickness of the rotary section on the straight segment connecting the centers of the cylindrical support surfaces of the racks; 799 / - maximal for the materials processed on the stamp, the springback angle of the part shelves. Sources of information taken into account in the examination 1. A. Nalov N. Technologists cold. Noah stamping. M., Mashinostroenie, 19b9, p. 159, fig. 786. ./ 6 2. Malov A. N. Cold stamping technologists. M., Mechanical Engineering, 1969, p. 159, fig. 78k. 3.Mesterin V.T. Listova stamping. Atlas of schemes. M., Mechanical Engineering, 1975, p. 90, fig. 207. C. U.S. Patent No. 2362006, cl. 72-396, 07.11. (prototype). phi2.1 fig.Z BiLd /} - // V /