SU1286099A3 - Method of joining two sheets and device for effecting same - Google Patents

Abstract

A method and apparatus for joining sheet metal pieces employing a male die and a female die wherein within one stroke only one piece is provided with incisions and the material of the other piece is pressed through the area between the incisions and laterally extruded beyond the edges so to form a rivet-type connection.

Description

The invention relates to the processing of metals by pressure, in particular, to methods and devices for joining parts by stamping.

The chain of the invention is to increase the strength of the joints.

FIG. Shows a partial side view of the first embodiment, the device. with sheets shown in section; in fig. 2 is similar to FIG. 1, execution with a complete joining process; Fig 3 is a partial section through the joint; FIG. 4 is a view, similar to FIG. 3, shown in the direction of the arrow A-A of FIG. 3; fig 5, is a top view of the compound of FIG. 3.4; in fig. 6.7 and 8 is a top view of the matrix of other forms of the device; in fig. 9 is a side view of a punch of another embodiment of the device; in Fig. 10, the die and punch are expanded; nga fig.P - view of the matrix of fig 10 in the direction of the arrow AO

The matrix encloses the stationary anvil 1, with a longitudinal rectangular cross section. FIG. I shows a side view of the narrow side of the anvil. Along the wide side of the anvil, the supporting parts extend. 2, which may have lateral branches (cMofIGO2) and facing to nGS

00 O5

 with

CD

The free edge of which is extruded as cutting edges. The plane defined by both cutting edges lies higher than the convex anvil surface 3 slightly convex by an amount smaller than the sum of the thickness of both sheets 4 and 5, but greater than the thickness of the facing 4 sheet.

The punch b has a working surface 7, which (cf. Fig. 1) already, than the distance of the two cutting edges of the die from each other. - the base of it. At that, the angle of inclination of the side of the truncated pyramid relative to the axis of the truncated pyramid is about 20, which corresponds to an acute angle of 40 °. The magnitude at which the working surface 7 already depends on the thickness between the cutting edges in particular, from the thickness of the sheet 5e facing to it, and is preferably measured in this way (for which several attempts are enough). that this fox 5, when joined, no longer cuts into the bounding surface 7, the edge is rounded, for example, with a radius of 0.5 mm and from

polished. The side surfaces of the punched plate of the corresponding shape of the truncated pyramid of the part of the punch are marked B / Contour of the punch on the side that passes perpendicular to the cutting edges and is shown on the figure EG, which doubles the punch on the igs. 1 and 2o. 40

Compound formation would be similar to external riveting, but after each use the plate should be ejected from the matrix.

The punch in FIG. 9 is complete as a double punch, with two punch in Fig. 1 placed adjacent to each other and made in one piece. Both working surfaces 7 and the corresponding lateral sides 14j vertically extending to the cutting edges and giving a sharp angle are visible. at 40, the cutting edges of the corresponding die are longer, so that in one press stroke two laps X are performed next to each other.

Sheet 4 is notched along the edges of the 9j passage. perpendicular to the plane of the drawing, through the interaction of the cutting edges with the punch 6, and the remaining c between the casing 10 and the casing 10 is extruded to the working surface 3 at the same time With continued pressure and with it the punch b, the pressed zone 1 of the sheet, which is not cut, shchtampov-on punching in such a way that its material is plastically deformed for the cut-through edges 12 with rigid engagement The sold I O gear hooks at its ends 13 to the sheet, since there was not

ten

15

thirty

86P99 -4

incision (Aig „3 and 5 shows the connection thus obtained” „

In the first embodiment, in the sheet, two parallel cuts are made about the Matrix and the punch, which have a very simple form of execution. If the appearance-joints are subject to special requirements, then the embodiment of FIGS. 6-8 is preferable. This embodiment is shown in the drawings as a top view of the Anvil matrix 1 has the shape of a cylinder and the supporting parts 2 have cutting edges who incise the sheet facing them longitudinally along the arc, -; circles with the same radius and center. Between the cuts, a jumper remains, having the function of jumpers in fig. The contour of the punch has the shape of a truncated cone with an acute angle, preferably at 40 °, similarly to FIG.

In the embodiment of FIG. 8 around the anvil 1 there are four supporting parts 2, and the anvil has a square base, while the jumpers remain in the corner zones. If necessary, the remaining jumpers can be rejected. This gives a closed circular shape (see, figs 6 and 7) nadraov and a closed.-Square shape (see, Fig.8), when from the sheet facing the matrix

20

25

0

five

0

Compound formation would be similar to external riveting, but after each use the plate should be ejected from the matrix.

The punch in FIG. 9 is complete as a double punch, with two punch in Fig. 1 placed adjacent to each other and made in one piece. Both working surfaces 7 and the corresponding lateral sides 14j vertically extending to the cutting edges and giving a sharp angle are visible. at 40, the cutting edges of the corresponding die are longer, so that in one press stroke two laps X are performed next to each other.

FIG. 0 and P shows the matrix on which the supporting parts are made replaceable 1 "sh.

The die has a base 15 with an equal, parallel to the press table, a supporting surface 16 and extending perpendicularly to it evenly behind: a 1m wide surface 17. Perpendicularly to the clamping surface 17n, the threaded hole 18 is made to the base.

The supporting parts 19 and 20 "ngzhovaln 21 are separately made elements. The anvil 21 is a steel forming part, the supporting parts are extruded and in the area of their cutting edges 22 (both on the side facing the anvil and remote from the anvil)) cutting edge - hardened or coated with a hard layer and ground Anvil and the supporting parts have through holes, which in the assembled state coincide with the threaded hole IS And the forces acting during the joining process are transmitted to ol by the fact that the supporting part on the anvil supported on a support surface 16O

On the side of the support part 19 remote from the clamping surface 17, a clamping washer 23 is provided, which is also provided with a through hole. The entire assembly is held by a clamping screw 24 o In Fig. 10, the clamping screw is not yet tightly tightened so that it can be seen to be bent outward and acting as a spring washer

This form of implementation has the advantage that the bearing parts, when worn at their cutting edges, are first turned over and, if the second pair of cutting edges are blunt, they can be replaced. In addition, the anvil is also replaceable. The anvil is practically not worn out, however, it allows to combine sheets of a different thickness, which causes a change in the distance between the cutting edges 22 and the surface of the anvil 25 o The upper edge 26 zazch me washers lies at the same height, as the upper edge 27 of the clamping surface 1 7, so that the same clamping conditions are present for both supporting parts.

Claims (5)

The support parts (smofigop) have a contour with side cut-outs, which serve to distribute the flexural loads with lateral springback, as far as possible along the entire length of the support parts. Invention Formula The method of joining two sheets superimposed on each other, at which rum is made by pressing on the molding, molding of the spine and on the pieces by extrusion of the cuts, which is different from the fact that, in order to improve the strength of the joint, the cuts are made on one of the two sheets, Plant material of uncut sheet into notches of another sheet. 2, the method according to claim 1, which differs from one another to the fact that the cuts in the sheet are made in the form of two straight parallel lines. 3, Device for connecting two sheets, stacked on each other, containing a punch, having a wall parallel to its longitudinal axis, and a matrix consisting of three parts, the middle of which is stationary, and the two extreme springs are spring-loaded and have a cutting edge on the working surface protruding above the surface of the middle part, characterized in that, in order to increase strength, the punch is made with a variable section in height consisting of at least two parts, one facing the tail section with parallel walls, and the other facing the matrix and carrying a working section with walls directed at an angle to the longitudinal axis of the punch, while the gauirine of this section is the distance between the cutting edges matrish edge portions by an amount not less than two sheet thicknesses, ukladgoaemogo from the punch. ( 4, The device as per item, exc., Isch, so that the working section of the punch is made in the form of a truncated cone. 5. The device according to POS, about tl and the fact that the working section of the punch is made in the form of a truncated pyramid. 6o Device according to PP. 4 and 5, characterized in that the angle the slope of the walls of the work area to the longitudinal axis of the punch is 30-50 7o The device according to claim 6, about tl and that the angle of inclination is 40,.% 8, The device according to gto4-7, about tl and - that the edge of the punch, limiting its working area, is made rounded 9 o The device according to PsYa, about tl and - ch ya eu with. in that the radius of the rugle is 0.5 mm, 10, the Device in PP. 3-9, which is characterized by the fact that the extreme parts of the matrix are provided with straight parallel cutting edges. P. The device according to PP "3-10, about t | It is affected by the fact that the cutting edges of the extreme parts of the matrix are made in the form of arcs of circles with the same radius and center. 12 "The device according to PPD 3-11, which is characterized by the fact that the extreme parts of the mat1) are imprinted with two pairs of cutting edges parallel to each other 3, Ho-n.lO device, about tl.. And that the punch is made with two work surfaces arranged in a row arranged to interact with the cutting edges of the die. five i- 1  and. 3 12 // // j //// r / sS V rf Phi2.2 7/7 /// ten W, N, . 5 Fi2.6 Fi2.8 FIG. 9 FIG. ten yy Фа2.11