SU837480A1 - Bending die - Google Patents

Description

(54) FLEXIBLE STAMP

one

The invention relates to the processing of metals by pressure, in particular to die tooling, and can be used for bending parts of a closed loop, for example, of the hook type on universal crank presses.

A device for bending wire hooks is known, comprising a plate with adjusting fingers and a roller handle mounted rotatably around a fixed finger | j

A disadvantage of the known device is the absence of a mechanical drive.

Known mTaNsn for flexible clamps containing rigidly mounted in the upper part of the stamp body with a horizontally mounted punch, and on the bottom plate of the stamp - two-turn around the axes from the influence of the semi-matrix, forming a stream and a spring-loaded latch 2 around the punch.

A disadvantage of the known stamp is that the rotation of the semi-matrix depends on the stroke of the punch, so there is no possibility to compensate for the material springing, which reduces the accuracy of the geometric shape of the bent part. Also known is a stamp in which a body with a horizontally mounted punch is mounted on the upper part of the stamp on an elastic lining, and the forming stream is formed during horizontal movement by means of wedges, two semi-matrices and a spring-loaded ejector.

The disadvantage of this stamp is that when the linear semi-matrices move horizontally due to the strength of the material, the geometrical shape of the part being bent is not ensured, and the need to install the housing with a punch on the elastic lining complicates the design of the stamp.

A bending punch is known that contains a punch-mandrel fixed on the top plate, side matrices mounted on the bottom plate, connected by means of support fingers with copiers of their movement mechanisms, as well as fixed stops. Copiers of the mechanisms of displacement of the side matrices are fixed on the upper plate 4 j.

Claims (2)

However, such a structure is characterized by a low accuracy of the parts produced due to springing of the ends of the part after bending. The purpose of the invention is to improve the accuracy of the parts obtained due to the additional bending of the ends by means of accelerated movement of the side matrices compared with the course of the punch mandrel. To this end, the mechanisms for moving the side matrices are each implemented as fixed on the top plate of the boiler and interacting with it, placed in two located one above the other row on the bottom plate between the fixed support and the non-working end of the side matrix, while the latter is made with a bevel at the bottom, copiers are rigidly closed en-, lena on the bottom plate, and the side matrix is equipped with a spring return to its original position. The pusher can be mounted on the top plate with the possibility of adjusting movement by means of a threaded pair. FIG. 1 shows the scheme of the proposed stamp, a section (to the left of the centerline - the details of the stamp in the initial position, to the right in the lowest one); in fig. 2 shows a possible embodiment of a punch for bending a P-shaped sheet edge; in fig. 3 - examples of stamped parts. On the top plate 1 of the stamp, the body 2 is rigidly fixed, carrying a horizontally mounted punch-mandrel 3 with an undercut in the shape of a flat 4. On the base plate 5 of the lower plate 6 spring side matrices 8 spring-loaded 7 with supporting fingers 9 supporting the bearings 10 and 11 are in contact with copiers 12, whose horizontal shelf from the side of the support 10 is made with step 13. The non-rim end of the side matrices 8 is made with a bevel 14 in contact with the roller 15 of the lower row of a set of two located one above the other rows of rollers 15, on the base plate 5 in the space between the fixed stop 16 and the non-working end 14 of the side matrix 8 with the possibility of introducing the upper row of rollers 15 between the lower ones from the impact of the pusher l 17. The pusher 17 is fixed on the top plate 1 by means of a threaded pair 18 for performing adjusting movement . In the bottom plate 6, the Vstavlenov. Supporting the workpiece 19 p. Spring-loaded ejector 20, and on the housing 2 - an additional stop 21 for bending the tail part of the hook-type part. The stamp works as follows. The blank 19 is placed between the stops (not shown) by the punch-mandrel 3 is pushed between the lateral dies 8, which in the initial position have a rigid stop. At the end of the stroke, the punch mandrel 3 TOJ aterer 17 presses on the upper row of rollers 15, causing the lower row to move apart. This indicates the accelerated, compared with the course of the punch 3, the movement of the side matrices 8 in the horizontal direction, completing the bending of the part. Due to the presence at the non-working end of the side matrices 8 of the bevels 14 and the execution of the copiers 12 with step 13, the side matrices 8 at the end of the bend are rotated by an amount sufficient to compensate for the spring back of the material. The amount of rotation of the side dies 8 is determined by the undercut in the form of a flat 4 on the punch-mandrel 3. The tail part of the hook-type part is bent when an additional stop 21 is applied to the workpiece 19 at the end of the bend. ). I The accelerated displacement of the half-matrix, as compared with the progress of the press ram, is determined by the expression: cos arc sin (0.866 h where a is the horizontal displacement of the half-matrix 8; P is the number of rollers of the upper row; R is the roller radius; h is depth of implementation of the upper row of rollers between the lower, or working stroke of the pusher Claim 1. A bending stamp containing a punch-mandrel fixed on the upper plate and side matrices mounted on the lower plate connected by means of support fingers to the copiers of their mechanisms Spaces, as well as fixed stops, are made in such a way that, in order to increase the accuracy of parts obtaining due to additional hemming of the ends by means of the movement of side matrices accelerated in comparison with the punch-mandrel movement, the side matrices are made the form of a pusher fixed on the top plate and rollers interacting with it, placed in two located one above the other row on the bottom plate between the fixed support and the non-working end of the side matrix, the latter being made with bevel at the bottom, copiers are rigidly fixed on the bottom plate, and the side matrices are equipped with reset springs. 2. A stamp in accordance with claim 1, clause / i, and often also with the fact that the plunger is fixed with the possibility of adjustment movement by means of a threaded pair. Sources of information taken into account in the examination of 1GMesh, erin V.T., Listova stampovW ka Atlas of diagrams, M, 1975, p. 40, fig. 172. 2. Foygelman, G.A. Album of designs of universal stamps, blocks of knots for cold stamping. M., 1970, p. 67, drawing 10.10. Z. Moshnin, bending, wrapping and straightening on presses. M, 1959, p ,, figb1b, 4. USSR author's certificate 373058, cl. At 21 O 37/06, 15.09.70 (prototype). 0 iput. 2