RU1810176C - Drawing press - Google Patents

Abstract

Usage: for the manufacture of large parts by drawing, for example, facing parts for automobiles. SUMMARY OF THE INVENTION: the press is equipped with an additional pre-bending punch of the workpiece before drawing with a pneumatic cylinder for its vertical movement. The punch interacts with the ejector through a controlled pneumatic distributor, and with its piston cavity, additionally with a controlling pneumatic distributor. Positive effect: the quality of parts during drawing is improved by adjusting the area of sheet metal in the drawing zone directly during stamping. 1 s.p. f-ly, 3 ill.

Description

The invention relates to the processing of metals by pressure, in particular cold stamping, and can be used for stamping large and medium-sized parts, for example, facing parts of automobile bodies manufactured by drawing.

The aim of the invention is to improve the accuracy and quality of large parts.

Figure 1 shows a General view of the press; Fig. 2 is a pneumatic communication diagram of an additional punch, ejector and conveying element in the initial position; in Fig. 3 - the same, at the time of drawing.

The press contains an upper plate 1 with a matrix 2 mounted on it, a lower plate 3 and a punch 4 mounted on it. An additional punch 5 is placed in the body of the punch 4 with a pneumatic cylinder 6 for its vertical movement.The press is equipped with ejectors 7 in an amount of, for example, 4. The number and design of the ejectors is selected from the shape of the workpiece and the part, in this particular example, this is the outer panel 8 of the car door, for removal after the extraction of which 4 ejectors are needed 7. The latter move vertically upwards - by means of a pneumatic cylinder 9, downward by means of a pneumatic cylinder 10. A copier 12 is placed on the rod 11 of the pneumatic cylinder 9, interacting with the roller 13.

The press is equipped with two pneumatic distributors - control 14 and controlled 15, providing interaction according to the technological cycle described below of the additional punch 5, ejectors 7, as well as a conveying element, for example, clamshell 16 (shown in Fig. Schematically), designed to withdraw already manufactured parts from the press extraction zone and on which the copier 17 is also placed. A roller 18 mounted on the latter interacts with the latter

ate

with

with

ABOUT

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the piston 19 of the control pneumatic distributor 14. The pneumatic distributor 15 is equipped with a piston 20 and has inlets 21, 22, 23, 24, 25, 26, 27, the cavity 28 and the channel

29. and the air distributor 14 - holes

30. 31.32, 33, 34, cavity 35 and channel 36, The pneumatic cylinder 6 has inlet openings 37.38 connected by pneumatic inlets 39, 40 respectively to the channel 29 and the opening 27 of the air distributor 15. In addition, the piston cavity of the pneumatic cylinder 6 through the inlet 41 connected to the opening 32 of the control air distributor 14. The pneumatic cylinder 9 has its piston cavity through the opening 42, the inlet 43 is connected to the workshop compressed air line. The pneumatic valves are interconnected by inlets 44, 45, connecting the corresponding pairs of their openings: 33 s 24 and 34 s 26.

In the punch 4, an adjustable stop is provided. 46 strokes of the piston 47 of the pneumatic cylinder 6. The press also includes clips 48 mounted on the bottom plate 3.

Press works as follows. Its initial position is shown in Figs. 1 and 2, in which the workpiece 8 is fed into the working area of the open die and placed on the ejectors 7 and an additional punch 5, the height difference of which relative to the mirror of the punch 4 determines a predetermined calculated preliminary deflection of the sheet blank before drawing. The magnitude of this deflection determines the area and mass of the metal directly subjected to further drawing, and ensures the surface quality and the accuracy of the geometric parameters of the door panel. The adjustment of the upper position of the punch 5 is carried out by the stop 41.

A command is issued and the top plate 1, together with the matrix 2, is lowered down. In this case, the rods of the pneumatic cylinders 10 act on the ejectors 7, when lowering their upper planes are set at the level of the clamp 47. When the rod 11 of the pneumatic cylinder 9 moves, its copier 12 begins to interact with the roller 13 mounted on the piston 20 of the controlled pneumatic distributor 15 and moves it to the extreme right position. The supply of compressed air from the piston cavity of the pneumatic cylinder 6 to its rod cavity is switched on by connecting the rod cavity through hole 37 and inlet 39, holes 25 and 26 and inlet 44. The piston cavity of cylinder 6 through holes 38, inlet 40, holes 22 and 27 Anal 29 is connected to the atmosphere. The punch 5 gradually slides down, performing

and having provided a predetermined deflection of the workpiece, therefore, until the end of the technological cycle, it is no longer involved in the workflow. At the same time with

the control pneumatic distributor 14 is connected to the atmosphere through the inlet 41 and the hole 32. In this position, the workpiece is drawn by the interaction of the punch 4 and the matrix 2.

With the subsequent opening of the stamp during the stroke, the ejectors 7, under the action of the pneumatic cylinders 9, move the finished part, the finished door panel, onto the plane with which

the part is removed by the conveying element — the clamshell shifter 16. Together with the rod 11, its copier 12 also moves upward, releasing the pneumatic distributor roller 15 from contact with it.

his piston 20 still remains in the right

position while compressed air continues

enter the stock cavity of the cylinder 6,

left the punch 5 in the lower position.

When taking the finished part out of the zone

of the stamp, the clamshell transferr 17 interacts with the roller 18, and the piston 19 begins to move to the right. Compressed air is now supplied from the control air distributor 14 to the piston cavity of the controlled air distributor 15, through the inlet 45 and the hole 33 and 24. The piston moves to the left and the compressed air through the cavity 28, hole 27, inlet 40 and the hole 38 enters the piston cavity the pneumatic cylinder 6, and its rod cavity through the hole 37, the inlet 39, the hole 39.25, the channel 29, the hole 23 is associated with the atmosphere. After that, the piston 47 rises, setting the punch 5 at a predetermined height until the next workpiece is fed. The drawing cycle of the large part is over.

Claims (2)

SUMMARY OF THE INVENTION 1. An extrusion press comprising a die mounted on a top plate, a punch mounted on a bottom plate, an ejector with a pneumatic cylinder, a conveying element with a copier placed on it, and a controllable and control air distributor interconnected, the latter installed with the ability to interact with the copier, characterized in that, in order to improve accuracy and quality when drawing large sheet metal parts, it is equipped with an additional punch installed in the punch th preliminary bending preform before stretching with its vertical movement pneumatic cylinder connected to the ejector through the controllable valve, and its piston cavity - in addition to the control pnevmoraspredeli- Telem. 2. Press according to claim 1, characterized in that it is equipped with an additional copier located on the rod of the ejector pneumatic cylinder and interacting with a controlled pneumatic distributor. Fie.Z