JPS6096337A - Blank holding construction of hydraulic press - Google Patents

Abstract

PURPOSE:To improve working efficiency with small driving power by lowering a ram by the main piston of an upper frame cylinder, supporting the piston in the cylinder of the blank holder in the ram by an upper frame and performing pressing irrespectively of blank holding force. CONSTITUTION:A ram 27 is lowered by a piston 25 in the cylinder 24 of an upper frame 23. A piston 31 fitted into a cylinder 30 in a blank holder provided in the ram 27 is supported by an upper frame 23. The pressing force of the blank holder is therefore received by the upper frame and the pressing force of the piston 25 in the cylinder 24 is used only for the pressing operation. Since the blank holding force is not received by a main piston 25 unlike in the prior art, less driving power is required and cycle time is reduced by which productivity is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a temporary holding structure for a hydraulic press used in precision punching.

In order to obtain a precision product without deformation during precision punching, before the punch enters the die hole with punching force, the punch and reverse holder or the die and holder must clamp the material to prevent it from deforming. ) It is necessary to handle and process the material. Conventionally, in the hydraulic press used for this punching process, the temporary presser (hereinafter also referred to as reverse temporary presser) is given a pressing force by a hydraulic cylinder, and as shown in Fig. 1, it slides into the main hydraulic cylinder 2 attached to the frame 1. A temporary press hydraulic cylinder 4 and a temporary press piston 5 that slides into the main piston 3 are incorporated into the main piston 3.
A temporary presser or its mounting portion 7 was incorporated into a punch (or die) holder 6 connected to the presser.

However, with the temporary holding structure of such a hydraulic press,
During the punching process, the main hydraulic cylinder 2 receives both the temporary holding force A (indicated by the ↑ mark) and the pressing force B (indicated by the 9 mark), and consumes a large amount of energy.

The present invention relates to an energy-saving type hydraulic press that improves the temporary holding structure of such a hydraulic press and makes the temporary holding hydraulic cylinder an independent type so that no load of temporary holding force is applied to the main hydraulic cylinder. It is something.

That is, the main piston is slidably fitted into a main hydraulic cylinder mounted on a frame supported by guide posts erected at both ends of the bolster, and connected to the lower end of the main piston so that both ends thereof are connected to the main piston. A ram is provided that fits into the guide post and moves up and down in a horizontal state, and cylinder storage chambers that open downward are provided inside both sides of the main piston connecting portion of this ram, and the cylinder can be slid in the vertical direction within these storage chambers. The structure incorporates a part of the temporary holding hydraulic cylinder and a temporary holding bismeen that slides into the part of this cylinder and whose end part slides through the upper part of the storage chamber and comes into contact with the lower surface of the frame, and This is a temporary holding structure of a hydraulic press for precision punching, in which the temporary holding cylinder is connected to a punch (or die) holder and a part of the temporary holding cylinder is connected to the temporary holding.

The present invention will be described in detail with reference to the embodiments shown in the drawings.
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In FIG. 2, a main hydraulic cylinder 24 is attached to an upper frame 23 supported by guide posts 22 and 22 erected at both ends of a bolster 21, and a main piston 25 is slidably fitted into this cylinder 24. . Furthermore, a ram 27 is connected to the lower end 26 of the main piston 25, and its both ends are fitted into guide posts 22.22, and the ram 27 moves up and down in a horizontal state. Cylinder accommodating chambers 28.28 are recessed inside both sides of the connecting portion, respectively, and these accommodating chambers 28.28.
28 opens downward, and a flange 29.2 is provided at the periphery of the opening.
is provided. Inside these storage chambers 28 and 28 is a part 30 of a temporary holding hydraulic cylinder that can be slid in the vertical direction.
．． 30 and a temporary holding piston 31.31 that slides into this cylinder part 30.30, and the temporary holding piston 31.31 is attached to the upper part 32.32 of the storage chamber 28.28.
The tenth end 33.33 of the frame 23 is in contact with the lower surface of the frame 23. The ram 27 is connected to a bond (or die) holder (not shown), and the holder cylinder portion 30.30 is configured to be connected to a holder (not shown).

In the hydraulic press of the present invention configured as described above,
Main hydraulic cylinder 24 and temporary holding cylinder part 30.
30 are all received by the frame 23, and oil pressure is simultaneously applied to the oil seedlings 34 and 35.35 of both cylinders, so that they are synchronized. When applying force Xi, the pressing force of the main hydraulic cylinder 24 passes through the piston 25 and directly presses the ram 27. However, the holding hydraulic cylinder part 30, 30 is inside the ram 27 and synchronized with the cylinder 24. However, it operates separately from this. Therefore, the main hydraulic cylinder 24 is not subjected to the temporary holding force C (indicated by the ↑ mark), and the press working force o
(indicated by the symbol f), the capacity can be reduced and cycle time can be improved.

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[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view schematically showing the main parts of a conventional hydraulic press for precision punching, and FIG. 2 is a longitudinal cross-sectional view of the main parts of a hydraulic press for precision punching according to an embodiment of the present invention. be. 21 ... Bolster 22 ... Guide post 23 ... Frame 24 ... Main hydraulic cylinder 25 ...
... Main piston 26 ... Lower end 27 ... Ram 28 ... Cylinder housing chamber 29 ...
... Flange part 30 ... Temporary press hydraulic pressure, cylinder part 31
...... Temporary holding piston 32 ...... Upper penetrating part 33 ...... Upper end part 34,,',5... Oil chamber 6-

Claims (1)

[Claims] (1) The main piston is slid into the main hydraulic cylinder, which is attached to a frame supported by guide posts erected at both ends of the bolster, and connected to the lower end of the main piston so that both ends of the main piston are connected to the lower end of the main piston. A ram is provided that fits into the guide post and moves up and down in a horizontal state, and cylinder storage chambers that open downward are provided inside both sides of the main piston connecting portion of this ram, and the ram is slidable in the vertical direction within these storage chambers. The structure includes a part of a temporary holding hydraulic cylinder and a temporary holding piston that slides into this part of the cylinder and whose end part slides through the upper part of the stored seedlings and comes into contact with the lower surface of the frame, A temporary press structure for a hydraulic press for precision punching, characterized in that the ram is connected to a punch (or die) holder and a part of the temporary press cylinder is connected to the temporary press.