SU1417959A1 - Arrangement for thickening the edges of sheet blanks - Google Patents

Abstract

The invention relates to the processing of metals by pressure and can be used in aircraft manufacturing, shipbuilding and other areas of mechanical engineering. The goal is to reduce the work effort of deforming and increase the quality of the resulting thickenings. The device comprises a support 1 and a pressure plate 2, between which a punch 3 is installed, a pusher (T) 4 and a backpressure element (EP) 5 with the possibility of mutual movement. P 3 and T 4 are in contact with each other on an inclined surface and are set so that their directions of movement are perpendicular to each other. At the same time, T 4 has the ability to move along the groove 6 of the support plate 1. The EP 5 has a groove 7 in which a protrusion 8 is installed, made on the surface T 4 with the possibility of moving along it. The connection of the groove 7 and the protrusion 8 is of the type dovetail. The protrusion 8 and the groove 7 are located at an angle to the direction of movement of T 4. To determine the movement, the calculated relationship is given. The workpiece 9 is placed on the slab 1. It is placed on it FROM, T4 and EP5 and is fixed on the slab 2. When T 4 is pulled along the edge of the workpiece 9, P 3 upsets it. Moving the P 3 and EP 5 in opposite directions provides a set of metal along the edge of the workpiece. 5 il. sP (L

Description

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The invention relates to the processing of metals by pressure, namely to sheet metal stamping, and can be used to form bulges on sheets.

The purpose of the invention is to improve the quality of shaping the bulges and reduce energy consumption by reducing the efforts of deformation.

Figure 1 shows the device, the initial position; Fig. 2 shows the device in the process of obtaining a thickening at the edge of the sheet; on fig.Z - section aa in figure 1; Fig. 4 is a diagram for the calculation of the formula for the coupling of the angles d and / до before deforming; fig. 3 - the same in the process of deformation.

The device comprises a support 1 and a pressure plate 2, between which a punch 3 is installed, a thrust 4 and a backpressure element 5 with the possibility of mutual movement. The punch 3 and the pusher 4 are in contact: then with each other on an inclined surface and installed in such a way that the directions of their movement are perpendicular to each other, with this, the pusher 4 has the ability to move along the groove 6 of the base plate 1. The backpressure element 5 installed in the cavity of the pressure plate on the one hand and between the punch and the pusher on the other hand, has a longitudinal groove 7, which is mounted on the longitudinal protrusion 8, made on the surface of the pusher 4, with the possibility of moving along it. The connection of the protrusion 8 and the groove 7 is made of the dovetail type. In this case, the longitudinal groove 7 and, accordingly, the longitudinal protrusion 8 are made at an angle to the direction of movement of the pusher, the value of which is related to the angle of inclination of the contact surface of the punch 3 and the pusher 4 as follows.

tg r-tgo,

where p is the angle of inclination of the longitudinal protrusion of the pusher and, accordingly, the groove of the backpressure element to the direction of movement of the pusher; o / - the angle of the surface

contact of the punch and pusher to the direction of movement of the pusher;

S - punch thickness; b is the thickness of the backpressure element.

The device works as follows.

in a way.

The sheet stock 9 is installed on the support surface of the base plate 1, then a punch 3 and a pusher 4 are installed on top of the sheet stock, as well as an element 5 of the counterpressure with groove 7 along the protrusion of the pusher 4. On top of the counterpressure element 5 and the sheet stock

fixed clamping plate 2, for example 5, using clamps, vice, hydraulic cylinders, etc. (not shown L. A force P is applied to the end of the pusher 4, the thrust of the pusher 4

along the edge of the sheet along the groove 6 of the support plate, while the pusher 4 acts on the punch 3 through the inclined surface with an angle c /, ensuring the movement of the punch perpen

dictum to his movement, while

the punch acts on the end of the workpiece along the entire length and upsets the sheet stock 9. During the movement of the pusher 4, respectively

the counterpressure element 5 is moved along the longitudinal protrusion of the pusher by the longitudinal groove 7, made at an angle / 3 to the direction of movement of the pusher.

Thus, moving in opposite directions, the punch 3 and the backpressure element 5 provide a set of material along the edge of the sheet due to the fact that the material

the sheet from under the punch moves into the zone of the cavity of the pressure plate 2, which (the zone is formed by moving the backpressure element 5 in the opposite direction to the movement of the punch 3. The reciprocating movement of the punch 3, the pusher 4 and the backpressure element 5 yi, as well as the thickness of the punch (sheet) S and the thickness of the counterpressure element (cavity) b, which are interconnected as follows

tg -.- tg d.

Given the initial thickness of the sheet (punch) S for a given increment of the thickness of the thickening b and specifying the values of the angle of inclination of the surface.

314

contact of the punch 3 and the pusher 4 (can be determined using the formula for the angle / E. The angle ot is chosen so as to reduce the working force P. At small values of the p / p angle, a small force is required to move the punch through the pusher. At angles d Close to 45 ° 5 force to move the pusher close to the force of movement of the punch.At angles of about / more than 45 °, the force required to move the pusher increases significantly.Thus, the optimum range for the angle сС lies within 0 0 45 °, t. e. the smaller the angle o (, it requires less effort to deform.

However, as the angle c approaches zero, the plunger must be made infinitely long. Therefore, for practical reasons, the optimal range for the angle o is 5 to 25 °.

Thus, after receiving the thickening, the pressing plate 2 is lifted, the backpressure element 5, the punch 3 and the pusher 4 are removed, and the sheet with the semi-thickening is removed. It is possible to obtain bulges both at the edge of the sheet, and at some distance from the edge of the sheet.

From the condition of constancy of the volume of the sheet blank before and after deformation (FIGS. 4 and 5), we calculate

V, h (j-S-L; Vi (h-S + n-b) -L (4h) S -f nbJ-L.- (1) Equate V V,

L- (ho S) (h.S - Jh- S +} -C

(2)

4h-s bn

n

eh

If the punch is moved by the value of ДЬ, and the counterpressure element, respectively, by n in the opposite direction and at the same time, the movement data are connected with the corners, i.e. the punch contacts the pusher through angle 0, and the backpressure element contacts the pusher through angle

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/ 5, THEN the CONNECTION of these angles by displacements and / 3 will be next

-tg / 5

P

L

where L is the length of the line of contact of the punch with the workpiece. . Equated in L, we get

tg / V., (4)

tgcf4h

Substituting (3) into (4), we obtain

tgi 1 ™ tg p - tgo /.

Thus, the connection of the angles is found.

To determine the height of the resulting thickening, depending on the magnitude of the movement of the pushers L1,

p dl-tg / 3.

25

40

45

50

55

where 1 is the value of the working movement of the pusher in the direction of the load P.

30 The proposed design improves the quality of the resulting thickenings and reduces energy costs.

Claims (1)

Invention Formula 35 A device for thickening the edges of sheet blanks, containing a longitudinal support plate and pressure plates installed on it, forming a cavity between them, placed in the cavity with the possibility of longitudinal and mutual movement of the punch and counterpressure element and driving them moving, characterized in that, in order to improve the quality forming thickenings and reducing energy consumption; the drive for moving the punch and the counterpressure element is made in the form of a pusher mounted on the base plate with the ability to move in In the direction perpendicular to its longitudinal axis, a guide groove for placing the pusher is made on the base plate, a protrusion is made on the pusher, and a groove for placing the protrusion on the pusher, while the surfaces of the punch and the pusher interacting with each other, as well as Fig.d FIG. FIG. five