RU65797U1 - STAMP FOR CUTTING PREPARATIONS AND Cramped bending of SHEET PARTS - Google Patents

Abstract

The stamp for cutting the workpiece and constrained bending of sheet parts relates to the field of metal forming, in particular to cold stamping, and can be used for cutting and subsequent bending of parts with a small bending radius and to create a thickening in the bending zone.

The essence of the utility model: a stamp for cutting a workpiece and constrained bending of sheet parts consists of a matrix, inside of which a rod of elastomer is installed on the pin, which serves to lift the ejector; a housing to which a rod of elastomer, a punch holder and a punch of elastomer (polyurethane or rubber) are fixed with a screw and nut; a knife attached by a spring to the upper plate, which has the ability to move along the guide plates, two of which are fixed on the body, and two on the matrix, in the groove of the body there is a spring-loaded roller, part of the radius of which goes into the knife slot, on the knife are set screws with arrows and graduated scales, and rods with springs and adjusting screws with arrows and graduated scales are installed in the housing.

The advantage of this utility model is that it is possible to adjust the spring force and the position of the roller in the groove of the housing. 5 ill.

Description

This stamp relates to the field of metal forming. In particular, for cold stamping, and can be used for cutting a workpiece and subsequent bending of a part with a small bending radius and to create a thickening in the bending zone.

The closest in technical essence to the proposed stamp is a stamp for cutting blanks and bending sheet parts, utility model patent No. 46954, bulletin No. 22 of 08/10/2005, containing a matrix inside which an elastomer rod is installed, which serves to lift the ejector, a body to which a rod of elastomer, a punch holder and a punch of elastomer (made of polyurethane or rubber) are fixed, a knife that can move along the guide plates, two of which are mounted on the body, and two on the matrix, in the groove Pusa is spring-loaded roller (0.35 ... 0.45) parts of which the blade enters the slot.

The disadvantages of the stamp for cutting the billet and bending sheet parts are the difficult adjustment of the spring preload force and the position of the roller in the groove of the housing.

The task is to expand the functionality of the stamp.

This is achieved by the fact that in the stamp for cutting the workpiece and cramped bending of sheet parts containing a matrix, inside which a rod of elastomer is installed, which serves to lift the ejector, a housing to which a rod of elastomer, a punch holder and a punch of elastomer (made of polyurethane or

rubber), a knife is fixed by a spring to the upper plate, which can move along the guide plates, two of which are mounted on the body, and two on the matrix, a spring-loaded roller is located in the groove of the body, part of the radius of which goes into the knife’s socket, and adjusting screws with arrows and graduated scales, and rods with springs and adjusting screws with arrows and graduated scales are installed in the body.

The essence of the utility model is illustrated by drawings, in which Fig. 1 shows a stamp at an initial stage, Fig. 2 at an intermediate stage, Fig. 3 at a final stamping stage, Fig. 4 - view A, Fig. 5 - view B.

The proposed stamp consists of a bottom plate 1, to which a matrix 3 is fastened with screws 2, inside which a rod of elastomer 5 is fixed with a pin 4, its compression is limited by stops 6, the height of which should be equal to 70% of the height of the rod, so as not to deform the elastomer more than 30%, this is necessary to maintain its performance; a pusher is located on the rod 7. A strip of material 8 is fed to the matrix, the movement of which in the given direction is provided by the guides 9, the protrusion of the matrix serves as a front stop. A punch 10 made of an elastomer (polyurethane or rubber), a punch holder 11 and a rod of elastomer 12 are attached with a screw 13 and a nut 14 to the housing 17. The housing 17 is fixed to the upper plate 18, the knife 28 is also attached to it with a spring 19. The movement of the knife 28 is carried out along the guide plates 20, which are attached to the housing 17 by screws 21 and provide the necessary clearance between the knife and the die, as well as along the guides 9 mounted on the matrix. The force on the knife 28 is transmitted through a spring-loaded roller 22, the position of which is regulated by two screws 23, set in

in accordance with graduated scales 24. The spring force 26 of the roller 22 is adjusted by screws 15 in accordance with the scales 16. The spring 26 and the roller 22 are contacted through two rods 25. The guide bushings 27 and the columns 29, pressed into the upper and lower plates, provide an accurate position upper and lower parts of the stamp.

The stamp works as follows. A strip 8 is fed, which moves along the guides 9. The advancement of the strip forward is limited by the protrusion of the matrix 3, which serves as a stop. The top plate remains stationary, with the screws 23, the position of the roller 22 is set on the scales 24 so that (0.35 ... 0.45) of its part is in the knife 28, this ensures the necessary force is transmitted to the knife for cutting the workpiece, and the screws 15 on the scales 16 sets the amount of preload force of the spring 26 (figure 1). Next, the upper plate 18 under the action of the pressure of the press begins to move down. Together with it, in the direction of the matrix 3, the housing 17 and the knife 28 move, to which the force is transmitted through the spring-loaded roller 22. The knife 28 cuts off the workpiece from the strip and stops when its protrusion abuts the strip (figure 2). With the further course of the upper plate 18 downward, the roller 22 exits its nest and slides along the surface of the knife 28, displacing the rod 25 and thereby compressing the spring 26. The spring 19 also compresses. When the casing 17 continues to move downward, the workpiece 8 bends into the half cylinder until as it descends to the ejector 7, which begins to compress the rod 5, at the same time, the housing 17 compresses the rod 12 until the protrusions on the housing abut against the punch holder 11. The elastic punch 10 is deformed with further pressure, bending the workpiece from the half cylinder th in the angled section. The straightening of the wall of the workpiece and the action of friction forces from the side of the punch contribute to the displacement of the workpiece material in its corner sections. Final

deformation of the workpiece is carried out by the ledges of the body, which transmit the press force to the ends of the bent shelves (figure 3). The rod 5 is compressed by no more than 30%, further compression is limited by the stops 6, which impede the downward movement of the ejector. During the reverse stroke, the spring 19 is expanded to its initial position, thereby lowering the knife 28, the roller 22 sinks into the socket of the knife.

The proposed stamp, in contrast to the stamp taken as a prototype, allows you to adjust the amount of dropping of the roller into the knife seat, as well as the force of spring preload in accordance with the thickness of the material being cut.

Claims (1)

A stamp for cutting a workpiece and cramped bending of sheet parts, containing a matrix inside which a rod of elastomer is installed, which serves to lift the ejector, a housing to which a rod of elastomer, a punch holder and a punch of elastomer (made of polyurethane or rubber) are fixed, a knife having the ability movements along the guide plates, two of which are fixed on the body, and two on the matrix, a spring-loaded roller is located in the groove of the body, part of the radius of which goes into the knife seat, characterized in that the knife has a mouth The adjusting screws with arrows and graduated scales have been updated, and rods with springs and adjusting screws with arrows and graduated scales have been installed in the housing.