SU1204299A1 - Die for punching holes - Google Patents

Description

The invention relates to a tooling for the pressure treatment of sheet material, in particular for punching holes in sheets of stators and rotors, and can be used in electrical and instrument-making industry.

The aim of the invention is to improve the quality of products by reducing the residual stresses in the material of the product resulting from punching.

Figure 1 shows the stamp, a longitudinal section; figure 2 - section aa in fig; on fig.Z - section bb in fig; Fig. 4 shows the position of the punches and the relative movement unit at the moment of punching; Fig, 5 is the same, when grinding punches,

The stamp contains an upper plate 1, a punch holder 2 fixed on it, an inlay plate 3 placed between them, a central punch 4, punches 5 and 6 located around it, a lower plate 7, a matrix 8 fixed on it, and a puller 9. In addition, a stamp contains a node of the axial movement of the punches 5 and 6 relative to the top plate 1,

The unit for relative movement of the punches 5 and 6 is made in the form of two rings 10 and 11J installed concentrically in the base plate 3 with the possibility of rotation around the pressure axis of the punch, and the ring placed in the punch holder 2 also with the possibility of rotation around the pressure axis of the stamp.

Punches 5 and 6 are identical in their implementation; their centers are arranged with a constant pitch around the circumference with the center located on the pressure axis of the punch. A groove is made in each punch 5 and 6 on the side facing the pressure axis. All grooves are at equal distance from the supporting ends of the punches, Punch 4 is designed with a collar. The ring located in the punch holder 2 is prefabricated and consists of two segments 12 and two gukhars 13. Segments 12 and crackers 13 are inserted into the grooves of the punches 5 and 6 and placed between them and the flange of the punch 4. At the bottom end of the ring 10 there are hollows . "In shape and size corresponding to / cross-section of the poiss

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New 5 and 6 and arranged in increments of a multiple step between the punches. At the upper ends of the segments 12 and the crackers 13, constituting a ring housed in the plug holder 2 and the slots of the punches 5 and 6, the projections f are made. equal to or greater than the depth of the valleys and this height is chosen not less than the depth of penetration of the punch into the metal before it is separated and is related by the ratio tl 0.3 S, where ti is the height of the protrusion, is the thickness of the part to be stamped. The ring placed in the punch holder 2 is rigidly connected through the intermediate ring 14 by studs 15 to the ring P. The rings 10, 11 and the associated ring associated with them are installed with the possibility of rotation around the pressure axis. The ring 10 is rotated with the pin 16 and the nut 17, and the ring 11 with the pin 18 and the nut 19.

The stamp works as follows.

When lowering the upper part of the stamp, a part of punches (punches 6) are inserted into the workpiece material to a depth h. The spacing of these punches and recesses in the workpiece is equal to twice the pitch of the holes in the finished product. At the end of the die stroke, when 5 punches 6 are submerged to a depth h, the pressing force, which is half the total force required for punching all the holes, drops sharply and at this moment another part of the punches (punch 5) touches the workpiece, penetrates into it depth of b40.38 and punches holes.

When moving up the movable part of the stamp, the puller 9 removes the finished dowel from the punches 5 and 6.

For rounding the punches 5 and 6 on a surface grinder, the stamp is removed from the press, the ring 11 is rotated clockwise with a pin 16 and the nut 17 at an angle of half a step between the punches 5 and 6, and the ring 10 is rotated with a pin I8 and a nut 19 at the same angle. After repolishing 5 punches, rings 11 and 10 are returned to their original position and fixed in that position. After that, the upper part of the stamp is set to nap5

equalizing columns (not shown) and the assembled stamp are clamped to the press.

The proposed stamp increases the quality of the stator or rotor sheets produced on it by reducing the residual stresses caused by 12029999.

in the material when punching. This reduction is the result of a reduction in the holding forces, which in turn is due to an increase in bridges when the holes are punched in series with two groups of punches.

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Claims (1)

STAMP FOR PUNCHING HOLES in sheet blanks, in particular in the sheets of the stator and rotor, containing a lower plate on which a matrix is fixed, an upper plate,. on which a punch holder is mounted, carrying a set of punches installed with the possibility of axial movement of one part relative to the other and relative to the upper plate, and a relative movement unit for punches, characterized in that, in order to improve the quality of products by reducing residual) X ^: stresses arising during punching , the punches are installed with a constant * step, and their centers are placed on a common circle, the center of which is located on the axis of the pressure of the stamp, on each punch from the side facing this axis, the transverse groove, the grooves on all punches · are located at an equal distance from the supporting ends of the punches, and the relative relative displacement unit of the latter is made in the form of three rings installed with the possibility of rotation around the pressure axis, two of which, covering and being covered, are placed between the ends of the punches and the upper plate, the third ring is installed in the punch holder with the possibility of contact with the upper side of the surface bounding the grooves of the punches, and is rigidly connected with the male ring in the female ring ... depression corresponding to the shape and size of the cross section of the punches and the spacing of a multiple step punch arrangement and a ring placed in the punch holder, Run ¹ us projections disposed with a step at a pitch between recesses in the female ring and having a height equal to depths of troughs. eleven