JPH0316239B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is a hydraulic compound used in closed forging, in which a material is sealed in the space between an upper mold and a lower mold, and a punch is inserted into the space to form the material. This invention relates to a drive device for a dynamic press.

<Prior Art> Double-acting presses for performing this type of closed forging include hydraulic presses and mechanical presses.

In the case of hydraulic presses, there are two methods: one that relies on the horsepower of a hydraulic pump for all of its working energy, and one that temporarily stores potential energy in an accumulator and releases it all at once during work.

However, in the former method, there is a practical limit to the capacity of the pump, making it difficult to increase the speed and forcing an unrealistically large amount of energy to be wasted.

Furthermore, the latter method requires a complex control system, and in addition, synchronization of the inner and outer rams is not possible at high speeds of double-acting presses.

Next, in the case of a mechanical press, work energy is stored in the form of flywheel rotational energy, which is extracted at any time by a clutch and brake and used for work. Such a mechanical press has high speed and excellent controllability.

However, when configuring a double-acting press, the structure becomes complicated, and it is almost impossible to combine the presses into a realistic size, especially in the case of a forging press that has a high pressing force relative to its dimensions.

Therefore, a double-acting press that has both the advantages of a hydraulic press and a mechanical press or a high-speed drive mechanism for driving such a press is desired.

<Objective of the Invention> This invention was proposed based on the above-mentioned requirements, and its object is to provide a drive device capable of operating a hydraulic double-acting press at high speed, which combines the advantages of a hydraulic press and a mechanical press. Our goal is to provide the following.

<Structure of the Invention> A drive device for a double-acting press according to the present invention includes a first gear having an eccentric body in a boss portion and rotated by a drive mechanism, and a first gear having an eccentric body in the boss portion, the first gear a second gear meshed with the double-acting press; and an inner ram hydraulic cylinder and an outer ram hydraulic cylinder connected to the inner ram and outer ram of the double-acting press via piping, respectively. One eccentric body provided on the boss portion of the gear is connected to the plunger of the inner ram hydraulic cylinder, and the other eccentric body and the plunger of the outer ram hydraulic cylinder are connected by connecting rods, and the first gear and By installing the eccentric bodies on the second gear with different phases and rotating the first and second gears in synchronization, the inner ram and outer ram operate synchronously, creating the ideal motion for a double-acting press. It is designed so that it can be obtained.

<Example> The present invention will be described below based on an illustrative example. As shown in FIG. 1, the hydraulic double-acting press has a hydraulic slide 2 installed on the top of a frame 1. As shown in FIG. This hydraulic slide 2 is
It has a piston-shaped inner ram 2A having an inner punch 3 fixed to its tip, and a ring-shaped outer ram 2B having an upper mold 4 fixed to its tip and through which the inner ram 2A passes.

This inner ram 2A and outer ram 2B
are fitted into cylinders 5A and 5B separately provided in the main body of the hydraulic ride 2 so as to be able to slide independently.

A driving device 7 according to the present invention is connected to the upper portions of the cylinders 5A, 5B via an inner ram operating pipe 6A and an outer ram operating pipe 6B, respectively, and the rams 2A, 2B are raised and lowered by this.

That is, a pullback pipe 8 or a pullback cylinder 9 is used to pull up the rams 2A, 2B.

At this time, on the top of the inner ram 2A,
Since the ram head 2a is provided, the cylinder 5
It is sufficient to simply connect the pullback piping 8 to the lower part of the outer ram 2B, but in the case of the outer ram 2B, a pullback cylinder 9 is used.

A bracket 10 is integrally attached to the piston rod 9a of the pullback cylinder 9, and the tip of the bracket 10 is connected to the outer surface of the outer ram 2B. Therefore, by supplying working fluid through the pullback pipe 8 connected to the pullback cylinder 9, the outer ram 2B is pulled up.

Next, as shown in FIGS. 2 to 4, the drive device 7 meshes with a first gear 13A having an eccentric body 11A in the boss portion and rotated by the drive mechanism 12. and a second gear 13B having an eccentric body 11B in a boss portion that rotates synchronously;
It has an inner ram hydraulic cylinder 14A and an outer ram hydraulic cylinder 14B connected to the inner ram operating pipe 6A and outer ram operating pipe 6B, respectively. One eccentric body 11A or 11B of the eccentric bodies 11A and 11B provided at the boss portions of the first and second gears 13A and 13B is connected to the plunger 1 of the hydraulic cylinder 14A.
5A, and the other eccentric 11B or 11A is connected to the plunger 15B of the hydraulic cylinder 14B by connecting rods 16A, 16B, respectively.

The drive mechanism 12 also includes a motor (not shown).
a flywheel 18 rotated by the motor via a pulley 17; and a clutch that selectively connects the flywheel 18 and the pinion shaft 19 to transmit rotation of the flywheel 18 to the pinion shaft 19. 20, two pinions 21 fixed to the pinion shaft 19 with fixing means such as keys, and a brake 22 mounted on the opposite side of the pinion shaft 19 from the clutch.

The first and second gears 13A and 13B are two gears arranged at intervals as shown in FIG.
The two gears are connected to each other by a boss, and eccentric bodies 11A and 1 are connected to the boss.
1B is integrally formed.

In addition, these first and second gears 13A, 13B
does not necessarily have to be a set of two as shown in this embodiment, and may be just one. In this case, the eccentric bodies 11A and 11B may be integrally formed with a boss portion protruding from one of the first and second gears.

These first and second gears 13A, 13B are rotatably supported by a pin 23 attached to a frame 26, and are meshed with each other.

And the first or second gear 13A or 13B
is engaged with the pinion 21.

Next, the connecting rods 16A and 16B and the hydraulic cylinders 14A and 14B will be explained. Although there are two sets of these, since they have substantially the same configuration, one of the connecting rods 16A and hydraulic cylinder 14A will be described below.

As shown in FIG. 4, one end of the connecting rod 16A is rotatably fitted to the outer periphery of the eccentric body 11A, and the spherical portion of the other end is connected to the plunger 15A.
The plunger 15A converts the rotational motion of the first (second) gear driven via the pinion shaft 19 into the linear motion of the plunger 15A.

Further, the hydraulic cylinder 14A is fixed to a frame 26, and the plunger 15A guided by a guide 24 slides thereon.

Here, the eccentric bodies 11A and 11B have relatively different phases and different eccentricities. Specifically, when the eccentric body 11A is at the top dead center, the eccentric body 11
The meshing of the eccentric gears 13A and 13B is set so that B is slightly advanced in the direction of rotation (for example, 0.2 radian). Of course, it is also possible to do the opposite.

Further, the eccentricity of the eccentric body 11A is 100 mm, and the eccentricity of the eccentric body 11B is 110 mm. In addition,
This amount of eccentricity may be the same.

With such a mechanism, the inner plunger 1
5A and outer plunger 15B are mechanically operated in perfect synchrony. In addition, when the amount of eccentricity of the eccentric body is made different as described above, the plunger 1
5A and plunger 15B will move with different strokes.

In addition, in the middle of the outer ram operation pipe 6B,
An intensifier fire 25 that can release the pressure inside the pipe 6B is connected.

When the drive mounting 7 configured as described above is operated, the driving force is hydrostatically transmitted to the rams 2A, 2B, and the inner ram 2A and outer ram 2B perform a stroke movement as shown in FIG. 5.

That is, the outer ram 2B descends faster than the inner ram 2A, stops by closing the mold, and the liquid is absorbed into the intensifier fire 25, causing the inner ram 2A to descend (molding). After that, it starts to rise at about the same time.

This means obtaining the ideal double-acting press motion.

Note that the present invention is applicable not only to the illustrated double-acting press but also to other types of double-acting presses such as a mechanical hydraulic double-acting press.

<Effects of the Invention> Since the drive device according to the present invention has the above configuration, it has the following effects.

A hydraulic double-acting press that combines the advantages of a hydraulic press and a mechanical press can be operated at the same high speed as a mechanical press.

Significant energy savings can be achieved.

There is no noise associated with hydraulic presses.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a hydraulic double-action press according to the present invention, and FIGS. 5 are stroke diagrams showing the behavior of the inner ram and outer ram of the double acting press according to the present invention. 1...Frame, 2...Hydraulic slide, 2A
...Inner ram, 2B...Outer ram, 2a
... Ram head, 3 ... Inner punch, 4 ...
Upper mold, 5A, 5B...Cylinder, 6A...Inner ram operating piping, 6B...Outer ram operating piping, 7...Drive device, 8...Pullback piping, 9
...Pullback cylinder, 9a ... Piston rod, 10 ... Bracket, 11A, 11B ... Eccentric body, 12 ... Drive mechanism, 13A, 13B ... Gear, 14A ... Hydraulic cylinder for inner ram, 1
4B……Hydraulic cylinder for outer ram, 15A,
15B...Plunger, 16A, 16B...Connecting rod, 17...Pulley, 18...Flywheel,
19...Pinion shaft, 20...Clutch,
21...pinion, 22...brake, 23...
Frame, 24...Guide, 25...Intensifier, 26...Frame.

Claims (1)

[Scope of Claims] 1. A first gear having an eccentric body in the boss portion and rotated by a drive mechanism, a second gear having an eccentric body in the boss portion and meshing with the first gear, and a second gear having an eccentric body in the boss portion and meshed with the first gear; A hydraulic cylinder for an inner ram and a hydraulic cylinder for an outer ram are connected to the inner ram and outer ram of the dynamic press via piping, respectively, and one eccentricity is provided at the boss portion of the first and second gears. The body and the plunger of the inner ram hydraulic cylinder and the other eccentric body and the plunger of the outer ram hydraulic cylinder are connected by connecting rods, respectively, and the phase of the eccentric bodies provided on the first gear and the second gear is connected. A drive device for a double-acting press, characterized in that: 2. The drive device for a double-acting press according to claim 1, wherein a fluid device capable of releasing pressure is connected in the middle of the outer ram piping.