SU685391A1 - Method of obtaining circular sheets from wide-web material - Google Patents

Description

one

The invention relates to the processing of metals by pressure, in particular to methods for the production of round sheet blanks, for example for electric motors made of H. irocorulon material.

There is a method of forming a contour with alternating convex portions bounded by arcs and concave portions by stamping 1.

However, the known method allows to obtain a shaped contour only on individual tapes and, in the case of using a wide-roll material, requires the preliminary separation of this material into separate tapes.

There is also known a method for producing round sheets of a wide-roll material whose width is several times larger than the diameter of the sheets produced. This method consists in the fact that, at first, the rolled material is continuously divided by ingrown knives into the required number of shaped ribbons with alternating convex and concave sections, and then, from individual ribbons, round sheets are formed by stamping. At least part of the contour

the convex portion of the individual tape is bounded by an arc with a radius corresponding to the radius of the sheet produced, and the concave portions are bounded by arcs matching the arcs bounding the convex portions. The centers of the radii of the arcs limit the same areas, are located on the same space, parallel to the longitudinal axis of the material 2.

This method does not provide for obtaining holes for fixing tapes during the subsequent formation of round sheets from them, therefore the quality of the sheets produced is not high enough, as well as the greater laboriousness of the process of the sheets produced, which is associated with the need to punch holes not when splitting the wide-roll material into separate tapes, but on a separate operation.

The aim of the invention is to improve the quality of the obtained sheets and reduce the complexity of their manufacture.

The goal is achieved in that the separation of the wide-polymeric material into individual tapes is carried out by shtamping and, during the separation process, the technological holes are punched in the ribbon.

In one embodiment of the method, the convex portions of the belts and at least a part of the technological holes are formed simultaneously.

In another embodiment of the method, grooves, in particular grooves for clamping or welding, are obtained at the points of contact of the arcs forming a convex and concave section of the ribbon.

In addition, when stamping sheets from individual tapes, the tape is centered on the holes punched on it, then the other required holes are punched, the tape is fixed again, and then other separation operations are carried out.

FIG. 1 shows the source material and its cutting; in fig. 2 - a separate shaped tape for receiving sheets at one-sided arrangement; in fig. 3 - a separate shaped tape for receiving sheets at a two-gage shakhmatny arrangement; in fig. 4 - the lower part of the chip for the implementation of the method; view from above; FIG. 5 is a section along A-A in FIG. four; in fig. 6 - upper part of shtampa, bottom view.

The method is carried out as follows.

On the original polycoronum material 1, the resulting circular sheets (steel sheets of the stator of the electric motor) are arranged so that they touch each other in the direction of the diagonal at points 2, and in the material supply direction they are separated by bridges or (if necessary) that one sheet overlaps the other in the longitudinal direction. In the first operation, the source material 1 is divided in a press into shaped belts 3, the outer surfaces 4 of which are bounded by arcs in contact with each other, whose radii are equal to the radii of the finished stator sheets.

Previously on the source material 1 punch technological holes 5.

At the beginning of the working stroke of the press, the original mater; al 1 is moved with the help of catchers 6, which enter hole 5 at step t, precisely set the material in the required position and then, in the section corresponding to step t, separate it throughout the width and form profiled sections of tapes of the appropriate length. The process is repeated until the separation of the starting material 1 along the entire length.

The resulting shaped belts 3 are wound on cores and individually fed to the next operation in another press.

In the second operation, the tape 3 is moved to the pin t, fix along two at least 5 holes by catchers 6, punch or cut two additional technological holes 7 located between future sheets, then punch or cut an axial hole 8, rotors 9 slots

and grooves 10 for clamping or welding, which are located in areas where the points of contact 2 are located. At the next transition, the tape is fixed along the holes 7 and the slots 11 of the stators are subsequently punched. The rotor sheets 12 and the stator sheets 13 are cut down, and the bridge 14, which is left between the sheets 13, goes to waste.

If it is necessary to obtain a large number of sheets of stators and rotors, it is advisable to divide the starting material 1 into separate shaped tapes 15 (Fig. 3) with a double-row shakhmat arrangement of round sheets. In the example shown in the drawing, blanks in a row parallel to the direction of material feed are arranged with overlap (the distance between the axes of adjacent parts is less than the diameter of the parts). Within the limits of one tape 15 between the blanks of round sheets in the direction of the diagonal there is a jumper.

At the outer contour of the resulting stator sheet there are three welding grooves 16 and a guide groove 17 for piling. One of the welding grooves of each sheet is located on the longitudinal axis of each row, the other in the zones of the 2 points of contact of the tape with the adjacent (before the separation of the source material) tape, and the third groove is mirrored relative to the other.

The position of the 2 points of contact with respect to the axis of the longitudinal row of blanks and thus the position of the grooves for welding and clamping is determined by the formula

cose 0,5 + -jir

where A is the smallest angle between the longitudinal axis and the point of 2 contact;

t is the distance between the axes of the blanks lying in the same longitudinal row;

D is the outer diameter of the stator sheet.

The proposed method of producing round sheets can be carried out on a stamp shown in Figs 4, 5, 6.

The stamp includes a bottom plate 18, a movable top plate 19, tools 20 for cutting a shaped contour, punches 21 for punching holes 5 and spring-loaded catchers 6 fixed to plate 19. Cutting tools 20 and punches 21 are covered by a spring-stripper 22 loaded with springs 23 , and move along the guides 24. On the bottom plate 18, fixed tools 25 and 26 are fixed to cut the contour contour of the tapes of the dies matrix 27 for punching holes 5 and the ejector 28 which surrounds them, which is supported in the initial position (in the rest) of the spring 29.

Claims (2)

The cutting tools 20 and 25 are centered by the punches 21 or the dies 27, respectively, due to the fact that the punches 21 and the dies 27 have the same seating surfaces and to accommodate them in the cutting tools 20, 25 and 26 the same holes are made. These holes also serve to center in the stamp manufacturing process. The cutting edges of tools 20, 25 and 26 have the same radii and are bounded by arcs of the same length. Each tool has chamfers 30. The stamp works as follows. The source material 1 is centered along the holes 5 by catchers 6 and the pressure remover 22 presses the material against the fixed parts 25 and 27 of the stamp. After that, the cutting tools 20 and 25 cut out the outer contours of the shaped belts in the zone corresponding to the material feed pitch t. At the same time, the punches 21 pierce the holes 5. When stamping upward, the puller 22 drops the cut sections of the shaped tape from the punching tools 20, the punches 21 and the catchers 6, and the ejector 28 pushes the sections of the tape between the stationary punching tools 25 upwards to allow subsequent longitudinal movement. The same shape and length of the cutting edges of the stamping tools simplifies their manufacture and installation of the stamp. Claim 1. Method for producing round sheets of broad coronal material, the width of which is several times larger than the diameter of the sheets produced, in which the coiled material is first divided into the required number of shaped ribbons with alternating convex portions, at least part of each of which is limited by an arc with a radius corresponding to the radius of the sheet produced, and concave portions bounded by arcs mating with arcs bounding convex portions and having centers located on the same straight line. oh parallel to the longitudinal axis of the material, after which round sheets, in particular sheets of electric motors, are formed by stamping, in order to improve the quality of the sheets and reduce the labor intensity of their manufacture, the separation of the wide-roll material into separate tapes is produced by stamping and, in the separation process, technological holes are punched in the ribbon. 2. Method according to l. 1, characterized in that the convex portions of the belts and at least part of the technological holes are formed simultaneously. 3. A method according to claim 1, characterized in that at the points of contact of the arcs forming the convex concave portions of the tape, grooves, in particular grooves for clamping or welding, are obtained. 4. The method according to paragraphs. 1 and 2, characterized in that when stamping sheets from individual tapes, the tape is centered on the technological holes punched on it, then the other necessary holes are punched, the tape is fixed again, and then other separate operations are carried out. Sources of information taken into account during the examination 1.Romanovsky V.P., Dagelaisk N.A. “Sequential stamping in a ribbon, M., Mashgiz, 1962, p. 78 and 80, FIG. 53. 2. US Patent No. 3388582, cl. 72-335, 1968. 2 "/ 6