RU2691012C1 - Device for magnetic-pulse punching - Google Patents

Abstract

FIELD: technological processes.SUBSTANCE: invention relates to metal forming by sheet metal materials by means of pulsed magnetic field. Cylindrical inductor together with the cage and support plates is fixed on the posts with possibility of movement and fixation; spring-loaded intermediate plates are installed between the support plates, the lower and upper plates of the device and can move along the posts. Said intermediate plates have step bearings with their end conical surface in constant contact with end face conical surfaces of annular spring-loaded segments, as well as puncheon holders with puncheons. At that, on the upper and lower plates matrixes with guides and pullers are fixed.EFFECT: broader technological capabilities of the device.1 cl, 3 dwg

Description

The invention relates to the processing of metals by pressure of cylindrical shells of sheet materials using a pulsed magnetic field according to the schemes "flat stamping", "crimping" or "distribution".

Known devices (Forging and stamping: A Handbook: In 4 tons. T. 4 Sheet stamping / Edited by S. Yakovlev S.: ed. Council: E. Semenov (previous) and others. - 2nd Ed., Rev. And ext. - M: Mashinostroenie, 2010. 732 pp.), which allow the electromagnetic field to deform metals with high electrical conductivity. A typical design of a flat inductor is shown in Figure 10, p. 357. Electromagnetic fields arise in flat inductors made in the shape of an Archimedes spiral when a pulsed current generator is discharged, and eddy currents are induced in electrically conductive sheet materials that generate electromagnetic fields in the opposite direction. As a result, repulsive electromechanical forces are generated that act on both the inductor and the sheet material.

A disadvantage of the known devices is the possibility of their use only for blanks of metals with high electrical conductivity, in addition, for each size of the blanks is required to produce the appropriate form and size of high-strength inductors.

A device for magnetic-pulse stamping of sheet materials (RF patent No. 2660505, IPC B21D 26/14, publ. 06/26/2018, Bull. No. 18) is known, which contains a cylindrical inductor, a missile element, a punch and a die for punching, punching and molding. equipped with racks and mounted on them upper, lower and intermediate plates, while the inductor is made with a clip and ring spring segments, placed between the support plates and mounted on the top plate, the matrix for cutting, punching or molding is made with the guides of the bar and and a stripper and placed on the bottom plate, the punch is made spring-loaded axially movable and fixed in the intermediate plate, placed above the die, wherein the punch comprises a flange end face of which is conical, ensuring permanent contact with the end surfaces of said ring inductor assembly segments. The device can be equipped with an elastic element placed in the puller with the possibility of contact with the punch.

The known device, taken as a prototype, allows it to be used according to the “flat stamping” scheme for sheet materials, as well as according to the “crimping” and “distribution” schemes of thin-walled shells, regardless of the electrical conductivity of the metal using one cylindrical inductor. The disadvantage of this device is the possibility for one discharge of the generator of pulse currents to stamp only one blank of sheet material.

The task of the invention is the expansion of the technological capabilities of the device for stamping sheet materials according to the scheme "flat stamping", as well as schemes "crimping" and "distribution" of thin-walled shells, and improving the performance of stamping.

To solve this problem, a device is proposed for magnetic-pulse punching of sheet materials containing upper and lower plates, pillars, a cylindrical inductor, support plates, a clip, a missile element, annular spring-loaded segments with a conical end surface, a matrix for stamping sheet materials with guide bars and a puller , a punch installed in the intermediate plate, springs, while the cylindrical inductor together with the clip and the supporting plates is fixed on the racks with the possibility of displacement and fixation, between the support plates, the lower and upper plates of the device, spring-loaded intermediate plates are installed with the ability to move along the uprights; with punches, and on the top and bottom plates fixed matrix with guides and pullers.

The proposed device is shown in the figures. FIG. 1 shows a device for magnetic-pulse stamping of sheet materials, carrying out operations of punching several holes simultaneously in two blanks of sheet materials; in fig. 2 shows the device in section AA in the top view; in fig. 3 device for crimping and distributing thin-walled shell.

The device for magnetic pulse punching (Fig. 1) contains the bottom plate 1, pillars 2, punching dies 3, guide rails 4, pullers 5, punches 6, springs 7, punch holders 8, intermediate plates 9 and 18, support plates 10 and 17, the holder 11, the missile element 12, the cylindrical inductor 13, the spring 14, the ring segments 15, the screws 16, the upper plate 19, the nuts 20 and the thrust bearings 21.

The device for magnetic-pulse stamping (Fig. 3) has an additional die holder 22 and a slider 23.

An inductor assembly consisting of supporting plates 10 and 17, a clip 11, a missile element 12, a cylindrical inductor 13, ring segments 15 with springs 14 is placed on pillars 2. Fix the inductor assembly on racks by screws 16. Then, intermediate plates are placed on the pillars from two sides 9 and 18, as well as springs 7. Punch holders 8 with punches 6 are fixed in intermediate plates. Bottom 1 and upper plates 19 are tied with racks 2 with adjusting the clearance between the plates with nuts 20. Matrices 3 are installed on the lower 1 and upper plates 19, for example, for punching with nap Inserting the strips 4 and the stripper 5. In the initial position, under the action of the springs 7, the intermediate plates 9 and 18, moving along the uprights 2, ensure the contact of the tapered end of the thrust bearing 21 with the tapered working end of the ring segments 15. In turn, the ring segments 15 under the action of the springs 14 are tight contact the side surface with the inner side surface of the missile element 12 made of highly conductive metal, for example copper. To ensure the closure of the contour, the missile element 12 is made in the form of a split sleeve, the ends of which are overlapped. As a result, the closed loop contour eddy currents. The sheet material in the form of a blank, strip or tape is based on the dies 3. The initial position of the parts of the device is shown in FIG. 1, b and FIG. 2, b. The device is fixed on the table magnetic pulse installation.

Device for magnetic-pulse stamping of sheet materials with a rigid tool works as follows. To cut or punch two parts at the same time, they discharge the pulsed current generator of the magnetic-pulse installation and an electromagnetic field arises around the cylindrical inductor, which induces eddy currents on the surface of the missile element 12. Elastic repulsion of the missile element 12 from the cylindrical inductor 13 occurs and move in the radial the direction (see the direction along the arrow) of the ring segments 15 along the surface of the support plates 10 and 17 until they are fully closed (Fig. 2, a) . At the same time, due to the contact of the conical end surfaces of the ring segments 15 and the thrust bearing 21, the intermediate plates 9 and 18 and the die holders 8 are moved with the punches 6 in the axial direction along the posts 2. The punches 6 contact the sheet material blank and punch (Fig. 1) , but). After the operation, under the action of the springs 7, the intermediate plates 9 and 18 together with the punches 6 are set to their original position, and the puller 5 removes the part or strip from the punches 6. A new billet of sheet material is laid on the matrix and the operation is repeated.

The device (Fig. 3) is configured to perform a crimping operation (Fig. 3, a) and distribution (Fig. 3, b) of thin-walled cylindrical shells. The device is rotated 90 ° and mounted on a magnetic pulse table. The crimping and distributing matrixes are fixed in matrix holders 22 with the ability to move with the sliders 23 relative to the plates 1 and 19. After installing the cylindrical shells in the cavity of the matrix 3 with the sliders, they are moved into the working area and are changed, then the matrixes 3 are moved to the side by means of the 23 sliders 23, the finished parts are removed and the process is repeated.

The technological capabilities of the proposed device are expanded due to the possibility of simultaneous production of several holes during punching, the implementation of other operations in sheet materials, regardless of their conductivity, and productivity is increased due to simultaneous punching of holes in two sheet blanks.

Claims (1)

A device for magnetic-pulse stamping of sheet materials, containing upper and lower plates, pillars, a cylindrical inductor, support plates, a yoke, a missile element, annular spring-loaded segments with a conical end surface, intermediate plates, a matrix with guide rails and a puller, a punch installed in intermediate plate, springs, characterized in that it is provided with punch holders with punches and dies for punching with guides and a puller, with a cylindrical inductor, a yoke and supports The plates are mounted on racks for movement and fixation, the intermediate plates are spring-loaded and installed between the bottom and top plates so that they can be moved along the racks between the support plates, and the foot plates are fixed in the intermediate plates, which constantly contact the end conical surfaces of the spring-loaded segments , with the puncheon holders with punches installed on the intermediate plates, and the said matrix for punching is fixed on in rhney and bottom plates.

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