RU55309U1 - STAMP FOR FORMING PRODUCTS FROM METAL SHEET - Google Patents

Abstract

The utility model relates to the processing of sheet material by stamping and can be used for molding products, for example, protective body armor. The technical problem, which is solved by a utility model, is to reduce the complexity and metal consumption in the manufacture of a complex form-forming surface of the punch and die, as well as to ensure prompt readjustment of the stamp to another bending profile. The technical problem is solved in that the stamp for forming products from a metal sheet contains a package of forming plates-punches and prefabricated dies, mounted with the possibility of movement and fixed relative to each other, according to a utility model, the punch and die are made in the form of a package of plates-punches and matrix plates installed in pairs in the grooves of the walls of the cartridge, with a gap between them, i equal to 0.3-0.5 of the width of the forming surface of the plate, while the plate-punches are mounted on the rod of the upper plate, and the matrix plate s fixed abutment on the bottom plate, and arranged equidistantly-forming surfaces of punches and matrices plates plates form a gap section for forming a predetermined profile from the sheet. The stamp includes a package of punchet plates - 1, mounted equidistant in pairs with the matrix plates - 2, with a gap between the forming surfaces of the plates "i" i = (0.3-0.5) a, "a" is the thickness of the plate. The plates are installed in the grooves of the walls of the cartridge - 3. The punchet plates are fixed on the rod 4, which is connected through the hinge assemblies 5 to the upper plate 6. The matrix plates are fixed by the lower ends on the lower plate - 7 using the stop 8. Equidistant forming surfaces of the punches and dies form a gap - 9 for stamping the sheet. The implementation of the proposal allows to reduce weight and size characteristics, speed up the process of re-adjustment of the stamp, reduce the metal structure. An independent claim is 1.

Description

The utility model relates to the processing of sheet material by stamping and can be used for molding products, for example, protective body armor.

Known stamp for hoods, in which the working part of the punch is made of interchangeable rods based on interchangeable inserts in a stationary ring (1). The device eliminates the need for the manufacture of metal-intensive support elements for each size of the part, simplifies the changeover of the stamp.

For large sheet products, the forming surface of the punch during stamping should provide the surface of the product without scratches and imprint.

The closest technical solution adopted as a prototype for the device is a stamp for angular bending of sheet blanks (2). In the known stamp, the punch is a package of working plates mounted with the possibility of tuning movements and fixing relative to each other. The support of the upper part of the punch mount is equipped with two cantilever beams in which the sliders are placed - stops supporting the working plates. Sliders - stops are mounted with the possibility of adjusting movement along the grooves of the beam and fixing relative to it. The lower part of the stamp is made in the form of two pivotally connected half-matrices and two supports symmetrically located relative to the hinge, in the form of pads with supporting pads.

When implementing the device is flexible hot workpieces with an angle of a given radius of curvature.

However, for the manufacture of a more complex profile of a part with different bending radii in sections, it is required to separately form them with the working parts of the punch and die.

The technical problem, which is solved by a useful model, is to reduce the complexity and metal consumption in the manufacture of a complex form-forming surface of the punch and matrix, as well as to ensure prompt readjustment of the stamp to another bending profile.

The technical problem is solved in that the stamp for forming products from a metal sheet contains a package of forming plates - punches and prefabricated dies, mounted with the possibility of movement and fixed

relative to each other, according to the utility model, the punch and matrix are made in the form of a package of plates — punches and matrix plates — installed in pairs in the grooves of the cassette walls, with a gap between them, i equal to 0.3-0.5 of the width of the forming surface of the plate, In this case, the punches plates are mounted on the rod of the upper plate, and the matrix plates are fixed with emphasis on the lower plate, and the equidistant placed forming surfaces of the plates - punches and matrix plates form a section gap for forming a given profile from the sheet.

The technical result obtained by the implementation of the device is as follows:

- reduction of weight and size characteristics by 20%;

- acceleration of the installation process by 30%;

- reduction in metal consumption by 25%.

A prototype of the stamp and a pilot batch of stamped products - bibs for protective vests were made, which confirms the compliance of the proposed technical solution with the criterion of industrial applicability.

When comparing the applicant’s proposals with the prototype, it was revealed that the proposed stamp is distinguished by the execution of the punch and matrix by their fastening and aspect ratio, which corresponds to the criterion: “novelty”.

The essence of the invention lies in the fact that the optimal and universal parameters of the stamping technology from a steel sheet were selected and worked out, taking into account the characteristics of ductility and hardness. The type-setting punch and die allow you to quickly readjust the stamp, change the forming surface to create the product of the desired profile. For stamping plates for bulletproof vests, a bulletproof steel is used, the characteristics of which are: spring, yield strength, elastic modulus determine the formability of the sheet, characterized by the stampability coefficient K _V = 0.375 · δ _t / E, where δ _t is the yield strength, E is the elastic modulus. For steel of different hardness, K _V is in the range from 3 to 30. For the armored steel, K _V ≈20 was experimentally chosen; with a stamping force of 5 tons, the plates - dies and punches 5-10 mm wide, due to the dimensions, the weight of the plates and the size of the area of the moldable surface, were moved apart to a gap that did not impair the quality of stamping, without dents or marks, when the pressure was distributed over the material. The best result is obtained if

the gap between the plates was 0.3-0.5 of its width. The limits i = (0.3-0.5) · a are chosen experimentally so that the corrugation does not occur on the surface and stamping is ensured.

The stamp is illustrated in the drawing in figure 1.

A package of plates - punches - 1, mounted equidistant in pairs to plates - matrices - 2, with a gap between the forming surfaces of the plates "i" i = (0.3-0.5) · a, "a" is the thickness of the plate. The plates are installed in the grooves of the walls of the cassette - 3, The plates - punches are fixed on the rod 4, which is connected through the hinge assemblies 5 to the upper plate 6. The plates - matrices are fixed with the lower ends on the lower plate - 7 using the stop 8. Equidistant forming surfaces of the punches and dies form a gap - 9 for stamping the sheet.

Device operation:

Cassette 3 with a set of plates - matrixes is mounted on the bottom plate of the press 7 through the emphasis 8.

A package of plates - punches 1 with a rod 4 is mounted on the upper plate of the press 6. Free fastening of plates - punches on the rod eliminates their jamming in the grooves of the cartridge and the abutment of the upper surfaces of the punches to the press plate to transfer force to each punch at the time of molding. The sheet blank is placed on the matrix plates and is fixed by the walls of the cassette against displacement.

After this, the press plates are closed, deforming the workpiece to the shape defined by the gap 9, the curvature of which varies along the surfaces of the punches, forming a moldable surface of the protective shield.

Next, the stamp is opened, lifting the upper plate of the press together with the punches, and remove the molded workpiece from the cartridge.

Sources of information adopted in the preparation of the description:

1. USSR Copyright Certificate No. 1321503 publ. 07/07/1987, class In 21 D 37/00.

2. RF patent No. 2055671 publ. 03/10/1996 c. In 2122/02 - a prototype.

Claims (1)

A stamp for forming products from a metal sheet containing a package of forming plates-punches and prefabricated dies, mounted with the possibility of movement and fixed relative to each other, characterized in that the punch and die are made in the form of a package of plate-punches and matrix plates installed in pairs in the grooves of the walls of the cartridge with a gap between them i equal to 0.3-0.5 of the width of the forming surface of the plate, while the plate-punches are mounted on the rod of the upper plate, and the matrix plate is fixed by stopping on the lower plate, and equidistantly placed forming surfaces of the punched plates and matrix plates form a gap in the cross section for forming a given profile from the sheet.