RU46954U1 - STAMP FOR CUTTING THE BILLET AND BENDING SHEET PARTS - Google Patents

Abstract

The stamp for cutting the billet and bending sheet metal parts relates to the field of metal forming, in particular 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 bending 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 can 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 (0.35-0.45) part of which goes into the knife socket.

The advantages of this utility model is that it allows you to cut the workpiece directly in the stamp.

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.

Known stamp for constrained bending of the part, consisting of three different configuration sections. In the first section, a billet of a flat workpiece into a half-cylinder occurs; on the second - profile shaping from a semi-cylindrical section to a corner section with compression of the shelves; on the third - the calibration of the corner profile with the landing of the shelf by 0.5 mm. Thus, the part is done in three operations [G. Proskuryakov Cramped bending. // Aviation industry, 1966, No. 2, S. 9-13.]

The disadvantages of this stamp are low productivity; expensive, metal-intensive and complex stamp design.

The closest in technical essence to the proposed stamp is a stamp for bending sheet parts, utility model patent No. 40230, bulletin No. 25 dated 09/10/2004, containing a die with an ejector, a punch made of elastomer, an elastomer rod is located between the punch holder and the body , the deformation of which is limited by the ledges of the housing, and between the matrix and the ejector mounted rod of elastomer.

The disadvantages of the stamp for bending sheet parts - increased complexity and lack of productivity.

The task is to expand the functionality of the prototype and increase productivity.

This is achieved by the fact that in the stamp for cutting the billet and bending sheet parts, it contains 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 is fixed to the upper plate with a spring, which can move along the guide plates, two of which are mounted on the housing, and two on the matrix, a spring-loaded roller is located in the housing groove, (0.35-0.45) part of which enters jack knife.

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

The proposed stamp consists of a bottom plate 1, to which a matrix 3 is fastened with screws 2, inside of 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 that the elastomer does not deform 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 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 15. The housing 15 is fixed to the upper plate 16, and the knife 17 is attached to it with a spring 18. Movement the knife 17 is carried out on the guide plates 19, which are attached to the housing 15 by screws 20 and provide the necessary clearance between the knife and the matrix, as well as on the guides 9 mounted on the matrix. The force on the knife 17 is transmitted through a spring-loaded roller 21,

the position of which is regulated by two screws 22. The spring 23 serves to create a certain force of the knife and return the roller 21 to its original state. The guide bushings 24 and columns 25, pressed into the upper and lower plates, ensure the exact position of the 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 upper plate remains stationary, the screws 22 set the position of the roller 21 so that (0.35-0.45) part of it is in the knife 17, this ensures the transfer of the necessary effort to the knife for cutting the workpiece (figure 1). Next, the upper plate 16 under the action of the pressure of the press begins to move down. Together with it, towards the matrix 3, the housing 15 and the knife 17 move, to which the force is transmitted through the spring-loaded roller 21. The knife 17 cuts off the workpiece from the strip and stops when its protrusion rests against the strip (figure 2). With the further course of the upper plate 16 downward, the roller 21 exits its nest and slides along the surface of the knife 16, while the spring 23 is compressed. Spring 18 is also compressed. As the body 15 continues to move downward, the workpiece 8 bends into the half cylinder until it drops to the ejector 7, which begins to compress the rod 5, while the case 15 compresses the rod 12 until the protrusions on the case abut against the punch holder 11. Elastic the punch 10 with further pressure on it is deformed, bending the workpiece from a semi-cylindrical to a corner 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. The final deformation of the workpiece is carried out by the ledges of the casing, which transmit the force of the press to the ends of the bent shelves (figure 3). Rod 5 is compressed by no more than 30%, further compression is limited

stops 6, which impede the movement of the ejector down. During the reverse stroke, the spring 18 is expanded to its original position, thereby raising the knife 17, the roller 21 sinks into the socket.

The proposed stamp, in contrast to the stamps taken as a prototype, allows cutting a workpiece and bending parts with a small bending radius in one press stroke, as well as thickening the material in the bending zone.

Claims (1)

A stamp for cutting the billet and bending 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, characterized in that a knife is mounted on the top plate with a spring, which can move along the guide plates, two of which are mounted on the housing, and two on the matrix, a spring-loaded roller is located in the housing groove, (0.35-0.45) part of which goes into the socket to the knife.