SU1155464A1 - Double-acting hydraulic press - Google Patents

Abstract

1. HYDRAULIC PRESS OF DOUBLE ACTION, containing outer and inner slides mounted in the frame, individual working cylinders for each of the sliders and return cylinders common to both sliders, as well as the control valve associated with the working fluid source, which is designed to expand technological capabilities due to the simultaneous use of an internal slide for deforming and pushing out products, as well as improving the operating conditions, it is provided with additional return cylinder fixed to the inner slide, and the main cavity additional return cylinders fluidly communicated with each other, and their pistons are rigidly coupled to the outer slide. 2. A press according to claim 1, characterized in that the additional return cylinders are made coaxial with the main return cylinders, and axial through holes are made in the plungers of the return cylinders connecting their cavities.

Description

The invention relates to forging and pressing machinery and can be used to create double action presses.

The purpose of the invention is to expand the technological capabilities by simultaneously using an internal slide for deforming and pushing out the product, as well as improving the cooling and lubricating conditions of the tool attached to the internal slide.

FIG. 1. schematically shows the proposed press with a control system; in fig. 2 - valve opening table.

The double action press has a power frame 1, an outer slider 2 with a working 3 and a return 4 cylinder. An internal slider 5 with a working cylinder 6 and additional return cylinders 7 is integrated into the outer slider 2 with the possibility of limited reverse movement relative to it. The cavities of cylinders 4 and 7 are hydraulically connected to each other through channels 8 in the common plunger 9 of these cylinders 4 and 7. The plungers 9 are made stepwise according to the diameters of the respective cylinders. The total force of the return cylinders 4 is greater than the total force of the additional cylinders 7 by the amount of force to keep the outer slide 2 in a fixed position, k When the internal slider 5 makes a direct relative stroke from the working cylinder 6. The control of the press cylinders is carried out through the hydraulic distributor 10 with a servo-drive 11, 12-14 inlet valves and 15-17 drain valves. The cylinders through the respective piping 18 and the valves can be connected either to the high-pressure power supply source 19 or to the drain tank 20. The hydraulic cylinders 3 are controlled by valves 13 and 16, hydraulic cylinder 6 - valves 14 and 17, hydraulic cylinders 4 and 7 - valves 12 and 15 The table in FIG. 2 illustrates a valve opening cycle, based on the position of the control valve 10, installed by the servo actuator 11, depending on the operation required. On the outer slider, an upper die 21 is attached, and on the inner slider, a plunger 22; the lower die 23 is fastened to the lower stationary part of the load frame 1. In the initial position of the mechanisms, the sliders 2 and 5 are in the extreme upper position, the valves of the hydraulic distributor are in position I (Fig. 2). The drain valves 16 and 17 of the working cylinders are open. Cavity return and additional cylinders 4 and 7 are locked, and thus eliminated the spontaneous lowering of the sliders.

The work of the press is carried out as follows.

During the direct joint run of sliders 2 and 5, valves 13, 15 and 17 are open (position II of the hydraulic distributor in the table). The high pressure fluid from the power source 5 19 through the open valve 13 and the corresponding pipelines 18 flows into the cylinders 3, and through the valve 15 is forced out of the cylinder 4 into the drain tank 20. Into the cylinder 6 water flows from the tank through the open valve 17. From the relative spontaneous displacement, the internal slider 5 is held by the pressure of the fluid in the cavity of the cylinders 7, which is equal to the counter-pressure when the fluid is displaced through the valve 10

5 from cylinders 4. Such a stroke may continue until the dies 21 and 23 are closed or terminated by forcing the distributor 10 to position I in the table. After closing the dies and pre-deforming the workpiece

0, an internal slide 5 is engaged with a plug 22. For this, the valve 10 is placed in position III according to the table in which the valves 13-15 are open. Operating cylinders 3 continue

5 remain under pressure, and the return cylinders are connected by a drain. The fluid entering through the open valve 14 into the cylinder 6 begins to move the inner slider 5 with the punch 22. At this, the punch continues deformation of the workpiece, and the liquid from the cylinders 7 is forced out through the channel in the plunger 9 into the return cylinders 4 and further through the valve 15 - into drain tank.

At the end of this operation, before returning, it is necessary to pull the punch 22 out of the deformed billet. For this, the valve is set in position IV, with valves 12, 13 and 17 open. The operating cylinders 3 remain under

pressure, cylinder 6 is connected via valve 17 to drain tank 20, and cylinders 4 and 7 through valve 12 are connected to power supply 19. Since the outer slider 2 remains pressed by the pistons of the cylinders 3, the plungers 9 also remain stationary. The liquid entering the return cylinders 4 through the channels in the plungers 9 passes into the cylinders 7 and begins to move the internal slide 5, with the largest displacement

0 is limited by the relative stroke of the sliders. Next, the valve 10 is shifted to position V, and the return stroke starts - valves 12, 16 and 17 are open. The outer slider 2 together with the internal 5 returns to the initial position under the action of the return cylinder 4, and the liquid from working cylinders 3 and 6 is displaced into the drain tank 20. After completion of the return stroke, the control valve is reset to its initial position 1. To carry out the independent stroke of the punch 22, the control valve is installed in position VI, with valves 12 open and 14 and the liquid from the power source 19 is supplied to the cylinders 4, 6 and 7. Under the action of the forces of the working cylinder 6, only the internal slide is moved, since the force of the additional return cylinders 7 is less than the forces of the common return cylinders 4. In turn, return

the cylinders restrain the outer slide 2 from lowering, and its upward movement is impossible because of the cavities of the working cylinders 3 locked by the valves 13 and 16. Thus, only the movement of the internal slide 5, i.e. extending the punch 22. The amount of movement is determined by the relative stroke of the sliders 2 and 5 between them.

The economic effect of the introduction

10 of the invention is provided by extending the range of components to be crimped and enhancing tool life.

Table open

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Rig. 2

Claims (2)

1. HYDRAULIC PRESS OF DOUBLE ACTION, containing the outer and inner sliders mounted in the bed, individual working cylinders for each of the sliders and return cylinders common to both sliders, as well as a control valve connected to the source of working fluid, characterized in that, in order to expand the technological opportunities due to the simultaneous use of the internal slider for deformation and pushing of products, as well as improving operating conditions, it is equipped with additional return With the cylinders mounted on the inner slider, the cavities of the additional and main return cylinders are hydraulically interconnected, and their plungers are rigidly connected to the outer slider. 2. Press on π. 1, characterized in that the additional return cylinders are made coaxial with the main return cylinders, and axial through holes are made in the plungers of the return cylinders connecting their cavities. FIG. 1