SU1344460A1 - Arrangement for forming a thickening on a sheet edge - Google Patents

Abstract

The invention relates to the processing of metals by pressure, namely to sheet punching, and can be used in aircraft manufacturing, the shipbuilding industry and other fields of mechanical engineering. The purpose of the invention is to simplify the design and increase the quality of the thickening. The device contains an upper plate 1 and a lower plate 2, between which two opposite pressure mechanisms (ml) 3 are installed with the possibility of radial movement relative to the upper and lower plates, firmly connected to the precipitates 4 punches. MP 3 is in contact with the inner surface of the crust 5 installed in the longitudinal groove of the plate 1, and the angle of inclination of the inner surface of the MP 3 is determined by the calculated dependence. In the process of thickening with punches, 4 precipitates of MP 3 slide along the inner surface of plate 1, increasing the rigidity of the structure. The punches 4 move the material under the crackers 5, which rise to form a cavity for thickening the edge. 1 il. ((L with J 4 4 a: o

Description

1134446

The invention relates to the processing of M1 tal by pressure, namely to sheet punching, and can be used for a set of bulges on sheets.

The purpose of the invention is to simplify the design and improve the quality.

The drawing shows the device section. left - in the initial position10

nii, on the right - in the process of formation of thickening.

The device contains an upper plate 1 and a lower plate 2, between which two opposing pressure mechanisms 3 are installed with opposing sides relative to the upper 1 and lower 2 plates, which are rigidly connected with slug punches 4 and opposite back pressure 3 with an inner surface in contact with crackers 5 installed in the longitudinal groove of the plate 1, wherein the angle of inclination of the inner surface of the backpressure mechanism 3 relative to the vertical is chosen from the condition:

90th - artg | -,

where K is the thickness of the punch precipitation,

B - width of the longitudinal groove in

pressure plate.

The angle c is calculated from the condition of the constancy of the volume before and after the change; by the punch, the settlement of the material of the sheet stock into the zone of thickening. From the condition of constant volume we get:

L1-KV,

Js

Where

ul

1G - g

the internal angle of the backpressure elements

hence the angle when the inner surface of the backpressure mechanism is to be satisfied must satisfy the condition:

  90 ° - arctg I Device works as follows,

The sheet stock is placed on the bottom plate 2 and clamped by the nepxHefi plate 1 with a force F, with

five

0

attached to it, for example, from the traverse of the press. After that, a force P is applied to the backpressure mechanism 3, for example, from a hydraulic cylinder, under the action of which backpressure mechanisms 3 with rigidly connected punches 4 upsets move towards the ends of the edges of the sheet. The punch 4 precipitates deform the sheet blank, moving the material under the crackers 5, which, along the inclined inner n-surface of the backpressure mechanism, will rise, forming a cavity to accommodate the thickening of the edge, and the volume of material that has been extruded will always be equal to into this cavity with a punch 4 precipitates. During the thickening process, the backpressure mechanisms 3 slide along the inner surface of the plate 1,

thereby increasing the rigidity of the structure.

After the process of thickening is completed, the top plate 1 under- goes, the counterpressure mechanisms with punches 4 precipitates are retracted to the initial position, and the crackers under the action of the internal surface of the backpressure mechanism are set to their original position, thereby pushing the edges from the thickening set zone, and the finished part falls into the cavity of the bottom plate 2 and is removed from the device. The next preset is set and the process of the weighting set is repeated.

The device was tested when receiving a bulge on the edge of a sheet of AMGB sheet 3 with dimensions of 200x100 mm. The device was mounted on the Olsen test gear. The workpiece was fixed with a top plate with a depth of 1000 kg. Counter-pressure mechanism with punches 4 sediments were moved using hydraulic cylinders with

Q force 3000 kg. Angle about / was 80, The result was a thickening on the edge of the sheet with dimensions S 6.0 - 6.1 mm, B h 18 mm, with good surface quality

g is the thickened part of the sheet, where S is the thickness of the thickening, h is the height of the thickening.

The proposed device will allow significantly ynpocTViTb the design of the device due to the rejection of the use of the hydraulic system, while improving the quality of the production of thickening due to the uniform backwater of the zone of formation of the thickening.

Claims (1)

Invention Formula A device for the formation of a bulge on the sheet edge, containing a base plate, mounted on it with the possibility of counter-movement of the sediment punches and a pressure plate mounted between them with backpressure mechanisms and grooves, in which the crackers are installed with the possibility of movement perpendicular to the base plate, interacting with the mechanisms Backpressure, characterized in that, in order to simplify the design, each backpressure mechanism is edited by M.Tothin. Order 4876/1 1 Compiled by N.Ainetdinov Tehred L. Oliynyk Proofreader M. Demchik Circulation 730 Subscription VNSHSHI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 .Production and printing company, Uzhgorod, st. Project, 4 filled in the form of a wedge, the longitudinal axis of which is combined with the line of displacement of the settlement punch rigidly connected to the settlement punch, the pressure plate is made in the form of an I-beam covering the backpressure mechanism with its shelves, while the wedge is installed with the possibility of the base interacting with the top shelf of the I-beam inclined with rusk, and the angle of inclination d of the said surface relative to the vertical is determined by the formula 90 - arctg where K - thickness of the punch precipitation In - pshrina grooves in the presser plate.