JPH0341278B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to the movement of a mechanical press such as a power press having a slide that is reciprocated in the vertical direction by a mechanical drive mechanism such as a crank mechanism or an eccentric drive mechanism. This relates to a physical balance device.

Prior Art and Problems to be Solved by the Invention When the slide in a mechanical press reciprocates, an excitation force is generated due to the unbalanced inertia force.
Vibrating the machine affects press processing accuracy,
If vibrations have a large amplitude, they can even cause vibration pollution to nearby residents. In addition, the impact load acting on the mold due to the unbalanced inertia of the slide is directly transmitted to the slide, adversely affecting motion conversion mechanisms such as the crank drive mechanism or eccentric drive mechanism, and reducing the life of the machine. There is a risk of significant deterioration. Therefore, a dynamic balancer (balancer) was adopted to balance the unbalanced inertial force of the slide, suppressing the occurrence of primary vibration, and relieving and dispersing the impact load, thereby improving machine life. .

However, since the mold half of which is attached to the slide has different mold dimensions and weights depending on the product specifications, dynamic equilibrium is required to match the unbalanced inertia between the slide and the specific mold. Even if the balance force of the device is set, if different molds are used, the inertial forces will not be balanced.

Therefore, it is necessary to readjust the dynamic balance device every time the mold used is changed, and especially for models that use balance weights, replacing the balance weights is cumbersome and can hinder productivity. I was getting used to it. For example, Japanese Patent Application Laid-open No. 192298/1983 has been proposed to solve this problem.

The present invention was created against this technical background, and its purpose is to adjust the balance of the unbalanced inertial force of the slide including the mold in response to changes in the weight (or mass) of the mold. An object of the present invention is to provide a variable dynamic balance device for a mechanical press that can be easily performed.

Means for Solving the Problem and Its Effect This object is to provide a hydraulic cylinder device consisting of a cylinder, a piston, and a piston rod that extends transversely to the vertically extending slide and extends through the cylinder in both directions of the cylinder. The cylinder extends vertically and is swingably connected to the other end of a support rod which is swingably supported by the press frame at one end, and is supported by the support rod, and one end of the piston rod is swingably slid. This is achieved by providing a dynamic balance device for a mechanical press, which has a balance weight attached to the other end of the piston rod to balance the unbalanced inertia of the slide, which is a reciprocating body.

When a mechanical press with such a configuration is operated, the piston rod swings about the connecting point between the cylinder of the fluid pressure cylinder device and the support rod as the vertical reciprocating movement of the slide, and the piston rod is attached to the piston rod. The balanced weight moves up and down in the opposite direction to the slide. The cylinder of a fluid pressure cylinder device can adjust its displacement with respect to the piston by supplying and discharging fluid through its supply and discharge ports.If the weight of the mold attached to the slide is large, the cylinder may be placed on the slide side. If the weight of the mold is small, it is sufficient to adjust and displace the cylinder to the opposite side of the slide.
And it can be easily balanced.

Example The illustrated embodiment will be described below.

FIG. 1 is a longitudinal sectional view of the press 1 seen from the side. A bolster 3 is placed and fixed on a frame head 2 of a press 1, and a lower die 4 is placed and fixed on the bolster 3. Upper mold 5 located above lower mold 4
is attached to the lower surface of the slide 6, and the slide 6
is supported by a pair of upper and lower cylindrical sliding bearings 7 mounted on the frame, and is reciprocated in the vertical direction by a known crank drive mechanism or eccentric drive mechanism (not shown).

The dynamic balance device 8 is located inside the frame housing A and is disposed behind the slide 6 (on the right side in the figure), and mainly includes a fluid pressure cylinder device 11 supported by a balance weight 9 and a support rod 10. It is configured. The fluid pressure cylinder device 11 consists of a cylinder 12 having a pair of ear shafts 13, fluid supply and discharge ports 14 and 15, a piston 16, and a piston rod 17 integrated with the piston 16, and is installed between the opposing walls 1A of the frame housing. The upper ends of the pair of support rods 10, whose lower ends are swingably supported by the supporting shafts 1B, are fitted into the pair of ear shafts 13 in a swingable manner, so that the cylinder 12 is in a vertical position. 10 is supported. One end of a piston rod 17 extending in both directions through the cylinder 12 is swingably connected to the slide 6, and a balance weight 9 is attached to the other end. The cylinder 12 is capable of adjusting its displacement with respect to the piston 16 by supplying and discharging fluid through its ports 14 and 15, so that the position of the ear shaft 13, which is the fulcrum of the lever, is variable. .

The operation of the press 1 is performed as follows.

When the slide 6 is driven by the operation of a drive source (not shown) and reciprocates in the vertical direction along a pair of upper and lower sliding bearings 7, the lower die 4 and the upper die 5 cooperate to press the material.

Further, as the slide 6 moves up and down, the piston rod 17 and the cylinder 12 swing up and down using the ear shaft 13 supported by the support rod 10 as a fulcrum, and the balance weight 9 attached to the tip of the piston rod 17 moves vertically in an antiphase relationship with respect to the slide 6, thereby maintaining the dynamic balance of the slide 6 including the upper die 5. This dynamic equilibrium relationship is
This can be achieved by supplying and discharging fluid into the cylinder 12 through the ports 14 and 15 to adjust the position of the cylinder 12 with respect to the piston 16, and by determining the position of the ear shaft 13, which is the pivot point of the piston rod 17. That is, when the weight (or mass) of the upper mold 5 is large, the cylinder 12 is moved toward the slide 6 side (Fig. 3), and when the weight (or mass) of the upper mold 5 is small, the cylinder 12 is moved toward the balance weight 9. Just move it to the side (Figure 4).

The features of this embodiment are as follows.

Since the dynamic balance of the slide 6 including the upper mold 5 is maintained, the occurrence of primary vibration caused by unbalanced inertia force is suppressed, and the weight (or mass) of the upper mold 5 is reduced.
Regardless of the difference, the bottom dead center accuracy is high, the life of the mold is extended, and product quality can be improved.

Since the balance weight 9 is directly connected to the slide 6 via the piston rod 7 to ensure dynamic balance, the impact force on motion converting parts such as the crank drive mechanism or the eccentric drive mechanism is reduced, which improves the machine life and improves the mechanical life. It is possible to improve the pressurizing capacity of the press, and it is also possible to stably perform high-speed operation.

If the weight (or mass) of the slide 6 including the upper mold 5 changes by replacing the upper mold 5, fluid is supplied to and discharged from the cylinder 12, and the position of the ear shaft 13, which is the fulcrum of the piston rod 17, changes. The dynamic balance of the slide 6 (including the upper die 5) can always be accurately ensured by adjusting the displacement.
Generation of primary vibrations is effectively suppressed.

The adjustment of the position of the cylinder 12, i.e. the adjustment of its dynamic balance with respect to the slide 6, is performed simply by adjusting the position of the cylinder 12.
Since it is only necessary to supply and discharge fluid to and from the press 1, this can be done as appropriate while checking the machining status and the movement status of the moving body even while the press 1 is in operation, and vibration generation can be avoided. Pressing operations can be carried out in quiet conditions with minimal noise.

Effects of the Invention As is clear from the above description, in the present invention, a balance weight for balancing the unbalanced inertial force of a slide, which is a reciprocating body, is connected to the slide so as to be swingable at one end of the fluid pressure cylinder device. The cylinder of the fluid pressure cylinder device is attached to the other end of the piston rod that extends in both directions.
It is swingably supported by a support rod in an upright position that is swingably supported by the frame, and is also movable relative to the piston using fluid pressure, and the balance weight moves up and down in an antiphase relation to the slide. Because it is configured to move, the dynamic balance of the slide including the mold is maintained, suppressing the occurrence of primary vibration caused by unbalanced inertial force, and regardless of the difference in the weight (or mass) of the mold, It is possible to maintain high dead center accuracy, extend the life of the mold, and improve product quality. Adjusting the position of the cylinder, which serves as the pivot point for the piston rod, or adjusting the dynamic balance of the slide, is easy because it is simply a matter of supplying and discharging fluid to and from the cylinder. This can be done as appropriate while checking the machining status and the motion status of the moving body, even if the press work is in progress, and the press work can always be performed in a quiet state with vibration generation minimized.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a mechanical press according to an embodiment of the present invention as seen from the side, FIG. 2 is a cross-sectional view taken along the line 2, and FIGS. 3 and 4 show variable adjustment conditions. FIG. 2 is a longitudinal cross-sectional view similar to FIG. 1 showing the type dynamic balance device. 1...Press, 2...Frame bed, 3...
Bolster, 4...Lower die, 5...Upper die, 6...Slide, 7...Sliding bearing, 8...Dynamic balance device, 9
...Balance weight, 10...Support rod, 11...
...Fluid pressure cylinder device, 12...Cylinder, 13
...Ear axis, 14...Port, 15...Port, 1
6... Piston, 17... Piston rod.

Claims (1)

[Claims] 1. A mechanical type having a slide extending in the vertical direction, and the slide being reciprocated in the vertical direction by a mechanical drive mechanism such as a crank drive mechanism or an eccentric drive mechanism. In a dynamic balance device of a press, a cylinder of a hydraulic cylinder device consisting of a cylinder, a piston, and a piston rod extending transversely to the slide and extending through the cylinder in both directions of the cylinder, extending in the vertical direction and having one end The piston rod is swingably connected to the other end of a support rod that is swingably supported by the press frame, and is supported by the support rod, and one end of the piston rod is swingably connected to the slide, and is a reciprocating body. A balance weight for balancing the unbalanced inertial force of the slide is attached to the other end of the piston rod, and the displacement of the cylinder relative to the slide can be adjusted, and the balance weight moves up and down in an antiphase relation to the slide. A dynamic balance device for a mechanical press, which is characterized by: