RU2240233C1 - Double-action press - Google Patents

Abstract

FIELD: forge-pressure equipment.

SUBSTANCE: the invention is dealt with a forge - pressure equipment, in particular, with a design of mechanical presses. The double-action press contains a crank drive of a slider and a hydraulic cylinder installed on the table of the press, on the upper plunger of which there is the lower part of a die. The hydraulic cylinder additionally has the lower plunger of a smaller diameter, on which by means of a cross-piece and pins passing through holes in the table of the press a plate is installed. The upper part of the die is installed on the plate and the plunger - on the slider of the press. In result the loading on the drive of the slider of the press is decreased.

EFFECT: decreased loading on the drive of the slider of the press.

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Description

The invention relates to forging equipment, in particular to the design of mechanical presses.

A double-acting press is known, comprising a crank drive of an upper slider with an upper semi-matrix, a hydraulic cylinder of an external slider drive with a lower half-matrix and a hydraulic cylinder of a central slider with a punch located in the press table [1].

A disadvantage of the known technical solution is that the upper slider of the press perceives the total clamping force of the half-matrix and the stamping force.

The invention is aimed at reducing the load on the drive of the slider press.

This is achieved by the fact that the hydraulic cylinder has an additional lower plunger of smaller diameter, on which a plate is installed by means of a traverse and passing through the holes in the press table of the press, the upper half-matrix installed on the plate, and the punch installed on the slider of the press.

The drawing shows a local section of the press table.

The press comprises a slider crank drive (not shown) and a double-acting cylinder 2 mounted on the table 1 of the press with upper 3 and lower 4 plungers. The diameter of the upper plunger is larger than the diameter of the lower. A sub-die plate 5 with a lower half-matrix 6 is installed on the upper plunger. The upper semi-matrix 7 is mounted on a plate 8 connected by presses passing through the press table and the sub-die with the possibility of relative translational movement of the studs 9 with the cross-bar installed on the lower plunger 10. The punch 11 is mounted on the press slide. An ejector 12 made in the form of a plunger is installed in the axial hole of the upper plunger.

The common piston cavity of the cylinder between the upper and lower plungers is filled with liquid and in the operating state is closed by a pressure limit valve to protect the press from overload (not shown). The rod cavity of the lower plunger in working condition is in fluid communication with the accumulator to return the plungers to their original position (not shown). The magnitude of the opening of the semi-matrices is controlled by the amount of fluid in the common piston cavity. The closed press height is adjusted by changing the amount of fluid in the rod cavities of the upper and lower plungers.

Press works as follows. The workpiece is placed on the lower half-matrix 6 through the hole in the plate 8 and the upper half-matrix 7. The action of the punch 11 on the workpiece moves the ejector 12, then the lower half-matrix 6, the sub-die plate 5 and the upper plunger 3 down. In this case, under the influence of the fluid in the common piston cavity, the lower plunger 4, the crosshead 10, the studs 9 and the plate 8 with the upper half-matrix 7 are moved down to close the half-matrices. Further movement of the punch leads to deformation of the workpiece, during which the half-matrix is compressed by a force proportional to the deformation force.

After stamping, under the action of the pressure created by the hydraulic accumulator in the rod cavity of the lower plunger, the plungers return to their original position, the half-matrixes open, the forging is pushed out of the lower half-matrix by the ejector and is removed from the die working space.

Using the proposed design allows to reduce the required nominal press force, simplifies the adjustment of the closed height and protects the press from overload.

Sources of information

1. 12 V98 P. Press double action. Application 60-174231, Japan. Abstract journal "Engineering Technology", 14B. Technology and equipment for forging and stamping production, No. 12, 1986, p. 14.

Claims (1)

Double-acting press containing a crank drive of a slider mounted on a press table is a hydraulic cylinder, on the upper plunger of which a lower half-matrix is installed, characterized in that the hydraulic cylinder has an additional lower plunger of a smaller diameter, on which by means of a beam and passing through holes in the press table a plate is installed in the studs, the upper half-matrix is mounted on the plate, and the punch is mounted on the press slider.