JPH0825099A - Press - Google Patents

Abstract

PURPOSE:To improve machining accuracy by suppressing the inclination in a right and left direction between a slide and a bolster due to an eccentric load. CONSTITUTION:In a press in which a slide 20 which is vertically moved with a slide driving mechanism 3 and a bolster 1b under the slide 20 are provided on the main body 1 of the press which is constituted of a pair of right and left side frames 1a which are roughly formed into a C-shape, a connecting member 1g for connecting between the right and left side frames 1a is provided near the slide 20. Even when bending load is generated on the main body 1 of press due to the eccentric load during press forming, the deformation of the right and left side frames is prevented by opposing the eccentric load with the connecting member 1g, so high-accuracy working is possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press machine having an improved frame structure.

[0002]

2. Description of the Related Art In a conventional press machine that employs a C-shaped frame, a so-called opening is generated due to a molding load, the parallelism between a slide and a bolster is impaired, and high precision machining cannot be performed. For this reason, various methods have conventionally been proposed for preventing the mouth from opening. For example, Japanese Utility Model Publication No. 59-6099 and Japanese Utility Model Publication No. 62-19437.
In Japanese Patent Laid-Open Publications, a side frame is provided with tie rods in the vertical direction, and in Japanese Laid-Open Patent Publication No. 57-209799 and Japanese Utility Model Laid-Open No. 59-81599, a hydraulic cylinder is provided in the rear of the side frame so that the side frame is It suppresses the opening of mouth. However, with these methods, although the opening of the side frame in the front-rear direction can be suppressed, the inclination of the slide in the left-right direction due to the eccentric load cannot be suppressed.

In order to improve such a problem, for example, in Japanese Patent Publication No. 63-611119 and Japanese Patent Publication No. 63-61120, the lower surface of the bolster is received by a spherical seat so that the bolster can be tilted in the longitudinal and lateral directions. A press machine has been proposed in which the parallelism between the slide and the bolster is maintained by making it follow. Also, for example, Japanese Utility Model Publication No. 51-13734 and Japanese Utility Model Publication No. 52-42.
No. 459, Japanese Utility Model Laid-Open No. 62-25098, Japanese Unexamined Patent Publication No. 5-15999, etc., by inserting a plurality of reinforcing ribs into the side frame to increase the rigidity of the side frame, the front-back direction between the slide and the bolster and A press machine has been proposed in which the inclination in the left-right direction is suppressed.

[0004]

However, in the press machine in which the lower surface of the bolster is received by the spherical seat, the sliding portion between the bolster and the spherical seat needs to be machined with high precision.
Since the connecting portion between the bolster and the frame requires a large rigidity, it is difficult to carry out, and even if it can be carried out, the press itself becomes very expensive.
On the other hand, in the latter press machine having reinforcing ribs in the side frames, it is easy to implement, but since the left and right side frames are separately reinforced, as shown in FIG. When the force f for opening the side frame b is exerted, it cannot be prevented, and there is a problem that the inclination in the left-right direction cannot be effectively suppressed. This invention has been made in order to improve such a problem. It is an object of the present invention to provide a press machine that employs a frame structure that can efficiently suppress the inclination between the slide and the bolster in the left-right direction against an eccentric load.

[0005]

In order to achieve the above object, the present invention provides a press body composed of a pair of left and right side frames formed in a substantially C shape with a slide vertically moved by a slide drive mechanism. In a press machine in which a bolster is provided below the slide, a connecting member that connects the left and right side frames is provided near the slide. Further, a clearance for maintenance is provided between the slide and the connecting member.

[0006]

[Operation] Even if a bending moment is generated in the press body due to an eccentric load during press forming with the above configuration, the side frame resists against the increase in the secondary moment of area due to the connecting member that connects the left and right side frames. Since the deformation of the slide is suppressed, it is possible to reduce the inclination between the slide and the bolster in the left-right direction. In addition, maintenance of devices provided behind the slide can be easily performed through the gap between the slide and the connecting member.

[0007]

Embodiment An embodiment of the present invention will be described in detail with reference to the drawings shown in FIG. 2 is a partially cutaway front view of the press machine, FIG. 3 is a sectional view of the same, and FIG. 4 is a rear view of the same. In these figures, 1 indicates a press body. The press body 1 has a pair of left and right side frames 1a formed in a substantially C shape, a slide drive mechanism 3 is provided between upper parts of the side frames 1a, and a bolster 1b is provided between lower parts thereof. The slide drive mechanism 3 has a crankshaft 4, and substantially the middle portion and the front end of the crankshaft 4 are supported by a front bearing 5 and a rear bearing 6 having bushes 5a, 6a on the inner peripheral surfaces thereof. The front bearing 5 is fixed to the front plate 1c that connects the upper front ends of the side frames 1a, and the rear bearing 6 is provided between the upper portions of the side frames 1a in the front-rear direction as shown in FIG. Both ends are fixed to the pair of bearing support plates 1d and 1e.
Of the bearing supporting plates 1d and 1e, the bearing supporting plate 1d located on the front side is provided with a rear bearing 6 at the lower part of the central portion as shown in FIG. 2 in order to avoid interference with the plunger 8.
1g is formed, and the lower end is fixed to the fixing plate 9a fixing the plunger guide 9.

Between the left and right side frames 1a, a connecting member 1g is provided slightly behind the opening 1f of the side frame 1a.
Are connected by. The connecting member 1g is formed in a plate shape, and has a main motor 14 and a slide 20 which will be described later.
It is installed substantially vertically at a position slightly closer to the main motor 14 side than the middle part of the slide body 20. In order to facilitate maintenance from the rear of the press body 1, the slide 20 and the connecting member 1
A sufficient gap 1h is formed between g and the lower end is almost the same as the lower surface of the motor mount 19 so that scrap generated during molding does not ride on the motor mount 19 on which the main motor 14 is installed. There is.

On the other hand, a main gear 10 is attached to the rear end of the crankshaft 4 constituting the slide drive mechanism 3. A main pinion 12 mounted on an output shaft 11b of a clutch brake 11 installed on the rear side of the press body 1 is meshed with the main gear 10, and a flywheel 13 is mounted on an input shaft 11a of the clutch brake 11. ing. The flywheel 13 is interlocked with a main motor 14 installed on a motor mount 19 installed substantially horizontally below the clutch brake 11 via an endless belt 15, and the main motor 14 allows the flywheel 13 to move. The flywheel 13 is driven to rotate, and a fan 13a is provided on the clutch brake 11 side of the flywheel 13.
Are provided so that the clutch brake 11 can be cooled by wind generated during rotation. Note that FIG.
Medium 23 is an overload protector to prevent overload,
Reference numeral 24 denotes a die height adjusting motor that drives the adjusting mechanism 18 to adjust the die height amount.

Next, the operation of the press machine constructed as described above will be explained. The flywheel 13 is driven by the main motor 14.
When the clutch of the clutch brake 11 is connected in the state of rotating, the rotation of the flywheel 13 is transmitted to the crankshaft 4 via the clutch, and the crankshaft 4 is rotated. Then, the slide 20 is moved up and down by the rotation of the crankshaft 4 via the connecting rod 16 and the plunger 8 to perform press molding. During molding, as shown in FIG. 5A, an eccentricity is provided between the bolster 1b and the slide 20. When the load F acts, a bending moment M is generated in the press body 1, and a force f for tilting the bolster 1b and the slide 20 in the left-right direction is generated.

However, the left and right side frames 1a are connected by a connecting member 1g at the rear of the opening 1f, and the cross-sectional shape of the cross section AA in FIG. As shown in (c), since the second moment of area is increased, the bending amount of the side frame 1a in the left-right direction, that is, the inclination θ in the left-right direction between the slide 20 and the bolster 1b can be suppressed. become. By the way, an eccentric load of 150 tons is applied between the slide 20 and the bolster 1b, and the conventional connecting member 1g
When the inclination θ in the left-right direction was measured with the one without the above and the one provided with the connecting member 1g of the present invention, the conventional one has a left eccentricity θ / right eccentricity θ of 2.0 minutes / 1.9 minutes. However, it was confirmed that in the example of the present invention, it could be significantly reduced to 1.5 minutes / 1.6 minutes.

On the other hand, by providing the gap 1h between the slide 20 and the connecting member 1g, the maintenance work such as the adjustment work of the overload protector 23 and the die height adjusting motor 24 provided at the rear of the slide 20 can be easily performed, and the press work can be performed. Even if the middle scrap is scattered to the main motor 14 side, it collides with the connecting member 1g and falls from the gap 1h, so that it does not accumulate on the motor mount 19 and
Easily discharge scrap.

Although the connecting member 1g is installed almost vertically in the above embodiment, it may be inclined as shown by the phantom line in FIG. The connecting member 1g is not limited to a plate shape, and may be a cylinder, a cylinder, a polygonal cylinder, a polygonal columnar L shape, a groove shape, or the like, and the connecting members 1g may be provided so as to intersect with each other.

[0014]

As described in detail above, according to the present invention, since the pair of left and right side frames are connected by the connecting member near the slide, an eccentric load acts between the bolster and the slide during press forming. Even if a bending moment is generated in the press body, the connecting member opposes the increased moment of inertia of area and suppresses the side frame from deforming. Can be prevented. This makes it possible to perform highly accurate processing even if an eccentric load is generated, and by providing a gap between the slide and the connecting member, the equipment installed behind the slide can be easily adjusted. Is also greatly improved. Also, if a connecting member is provided on the front side of the main motor, scrap generated during the press work will not hit the connecting member and fall downward, and will not be deposited on the motor mounting base. It will be easy.

[Brief description of drawings]

FIG. 1 is an explanatory view of a conventional press machine.

FIG. 2 is a partially cutaway front view of the press machine according to the embodiment of the present invention.

FIG. 3 is a sectional view of a press machine according to an embodiment of the present invention.

FIG. 4 is a partially cutaway rear view of the press machine according to the embodiment of the present invention.

FIG. 5 (a) is a front view showing the operation of the press machine according to the embodiment of the present invention. (B) A side view showing the operation of the press machine according to the embodiment of the present invention. (B) It is sectional drawing which follows the AA line of (b) of FIG.

[Explanation of Codes] 1 ... Press main body, 1a ... Side frame, 1b ... Bolster, 1g ... Connection member, 1h ... Gap, 3 ... Slide drive mechanism, 20 ... Slide.

Claims (3)

[Claims] 1. A slide body 20 vertically moved by a slide drive mechanism 3 is provided on a press body 1 composed of a pair of left and right side frames 1a formed in a substantially C shape, and a bolster 1b is provided below the slide 20. In the press machine, the left and right side frames 1a are provided near the slide 20.
A press machine comprising a connecting member 1g for connecting the two. 2. The press machine according to claim 1, wherein a gap 1h for maintenance is provided between the slide 20 and the connecting member 1g. 3. The press machine according to claim 1, wherein the connecting member 1 is formed in a plate shape, a solid cross section, or a hollow cross section.