SU1291243A1 - Die for bending sheet blanks - Google Patents

Abstract

SUBSTANCE: invention relates to retrofit dies for bending piece blanks and ensures accuracy of bending due to self-adjustment of the matrix (M). The stamp is made on a fixed bending block and rotatable to adjust parts of the punch (P), as well as spring-loaded clamp and composite M. On P and M Insulated thrust planes provide self-tuning M at the bending angle corresponding to the angle of rotation P relative to the bending shoe. 1 z.p, f-ly, 4 ill. (L with to 1C "lib 00

Description

112

The invention relates to cold sheet punching and can be used, in particular, in the machine tool scientific research institute when stamping bent parts of increased accuracy.

The purpose of the invention is to improve the accuracy of bending parts by self-installation of the matrix.

FIG. 1 shows the proposed stamp, a general view; in fig. 2 shows section A-A in FIG. 1j in FIG. 3 is a section BB in FIG. one; in fig. 4 is a view of B in FIG. one.

The stamp contains a movable plate 1 with a punch holder 2, in which the bending block 3 and parts 4 and 5 of the punch are fixed. The latter are mounted on the cylindrical surfaces of the punch holder 2 with the possibility of tuning rotation relative to the bending block 3. In the movable plate 1, worms 6 with tinted limbs 7 are mounted for manual adjustment of the position of the parts of the punch with shanks 8 for installation of the automatic die adjustment drive. Worm screws 6 interact through the rims of 9 worm wheels with parts 4 and 5 of the punch.

The stamp is provided with a matrix made of parts 10 and 11 mounted on the cylindrical support surface 12 of the matrix holder 13 and the spring-loaded clamp 14 mounted on the fixed plate 15.

The clamp 14 and the flexible block 3 are placed in grooves made in the lateral sides of the parts of the punch and die facing one another. The parts of the punch and die are formed with the planes inclined to the axis at an angle of 2 planes 16 and 17. The planes 16 pass through the entire bending area, are working and have an undercut equal to the thickness of the bent part. The plane 17 is located behind the bending area and is resistant. The matrix parts 10 and 11 have the ability to rotate relative to the center O of the radius and are flexible along the cylindrical bearing surface 12 of the matrix holder 13. The stamp works as follows. Before installing the stamp on the press, parts 4 and 5 of the punch are adjusted to the design angle P are flexible. Then the test is performed. For this, the blanks are set at

32

The press 14 and when lowering the movable plate 1 is clamped by the bending block 3 and is folded over by parts 10 and 11 of the die in parts 4 and 5 of the punch. Based on the results of the control, if necessary, the punch of the stamp punch is reconfigured. The adjustment can be manual — using a calibrated limb 7 by rotating it by the required number of divisions. Moreover, the price of one limb division corresponds to a certain angle of rotation of the movable part of the punch, for example, O - 10.

Setting the punch at a given angle can be performed automatically, for which it is necessary to automate the control of the dimensions of bending and, according to its results, the actuator interacts on the shanks of 8 screws 6.

When setting up and operating the proposed die, parts of the matrix are always self-tuning in angle d. parts of the punch due to the interaction of the stop planes 17. The stamp has the ability to bend two parts simultaneously with independent adjustment of the specified bending angles for each part. This is especially valuable for bending groups of contact electromagnetic relays with several charged plates, obtaining high-precision bending of which makes it possible to halve the time for adjustment and calibration of assembled relays.

40

Claims (2)

1. A stamp for bending sheet blanks containing a composite punch mounted on a movable plate in a punch holder, both parts of which are associated with the mechanism of their tuning rotation and have a cylindrical bearing surface, as well as a two-part matrix mounted on the cylindrical supporting surface of the holder holder, fixed on a fixed plate, which is characterized by the fact that, in order to increase the accuracy of bending by means of self-assembly of the matrix, it is equipped with a fixed bending block fixed to the mobile plate, and a spring-loaded clamp mounted on a fixed plate, each a part of the punch and die is made with a groove on the side facing one another to accommodate the bending block and pressing, respectively, and with planes inclined to the axis of the punch at one angle, with one pair of opposite inclined planes of each part of the punch and die being installed, and between the pair of other inclined planes, an undercut is made to place the blanks, parts of the matrix are installed with of rotation around the center of curvature of the support surface of the matrix holder. , 2. A stamp according to claim 1, characterized in that the mechanism for adjusting the rotation of the parts of the punch is made in the form of two rims of worm gears, rigidly connected 1x with the corresponding part of the punch, and the screws connected with them are screws with limbs mounted on a movable plate and having shanks for connection to the drive. . ShZh Y //////: (// A y /. T / zv // sh W /// M /// A P Figg 7 1 29.1 243 bb AND l / t 9 V // Compiled by V.Grigoreva Editor M.Blanar Tehred V.KaDar Corrector A.Ilyin    - - - - - - - -h - - - - Order 75/11 Circulation 733. Subscription VNIIPI USSR State Committee PS cases of inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 sh FIG. h