JPH02229700A - Variable type dynamic balancer of mechanical press - Google Patents

Abstract

PURPOSE:To maintain the dynamic balance of a slide and to maintain the high accuracy of the bottom dead point of a forming mold by allowing the displacement adjustment of a cylinder with respect to a slide and moving a balance weight upward and downward in an inverse phase relation with the slide. CONSTITUTION:A piston rod 17 and a cylinder 12 oscillate in a vertical direction with a trunnion 13 part supported by a supporting rod 10 as a fulcrum as the slide 6 moves upward and downward. A balance weight 9 attached to the front end of the piston rod 17 moves in the vertical direction in the inverse phase relation with the slide 6 and the dynamic balance of the slide 6 including an upper mold 5 is maintained. This dynamic balance relation is obtd. by supplying and discharging fluid to and from the inside of the cylinder 12 through ports 14, 15 to adjust the position of the cylinder 12 with respect to the piston 16, thereby determining the position of the trunnion 13 which is the oscillation fulcrum of the piston rod 17.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to 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. It is.

Problems to be Solved by the Prior Art and the Invention When the slide in a mechanical press reciprocates, an excitation force is generated due to the unbalanced inertia force, which causes the machine to vibrate, affecting press processing accuracy and reducing the amplitude. If the vibration is large, it can even lead to vibration pollution for nearby residents. Also,
The impact load that acts on the green 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, significantly reducing the life of the machine. There is a risk of sagging. Therefore, a dynamic balancer (balancer) is employed to balance the unbalanced inertial force of the slide, suppressing the occurrence of primary vibration, and relieving and distributing the impact load, thereby improving the life of the machine.

However, the mold is being inspected by slides for half a day.
Because different mold dimensions and heaviest molds are used depending on the product specifications, even if the balance force of the dynamic balance device is set according to the unbalanced inertia of the slide and the specific mold,
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 in the type that uses balance weights, replacing the balance way 1 is complicated and hinders productivity. It was a factor. For example, Japanese Patent Application Laid-Open No. 62-1989 has been proposed to solve this problem.
192298 can be mentioned.

The present invention was proposed in F91 based on this technical background, and its purpose is to counterbalance the unbalanced inertial force of the slide including the mold in response to changes in the mold due to heavy intoxication (or deterioration). It is an object of the present invention to provide a variable dynamic balance device for a mechanical press that allows easy alignment adjustment.

Fluid pressure cylinder 1 consisting of a means for solving the problem and its piston rod! One end of the cylinder is swingably connected to the other end of a support rod which is swingably supported by the press frame and supported by the support rod, and one end of the piston rod is swingably connected to the slide. This is also achieved by providing a variable dynamic balance head for the mechanical press, in which a balance weight is attached to the other end of the piston rod to balance the unbalanced inertia of the slide during reciprocating motion.

When a mechanical press with such a configuration is operated, the piston rod swings around the connection point between the cylinder of the fluid pressure cylinder device and the support rod as a fulcrum as the slide reciprocates in the vertical direction. The attached balance weight moves up and down in the opposite direction to the slide. The cylinder of the fluid pressure cylinder device can adjust its displacement with respect to the piston by supplying and discharging fluid through its supply and discharge boat.If the weight of the mold attached to the slide is large, the displacement of the cylinder can be adjusted on the slide side. If the ffiffi of the mold is small, the cylinder can be adjusted and displaced to the opposite side of the slide, thereby easily counteracting the unbalanced inertia of the slide including the mold with high precision. Can be matched.

Example The illustrated embodiment will be described below.

Figure 1 shows brace 1 on the side. It is a top view lζa seen from the side.

A bolster 3 is placed and fixed on the frame head 2 of the brace 1, and a lower mold 4 is placed and fixed on the bolster 3.

The upper mold 5 located above the lower mold 4 is attached to the lower surface of a slide 6, and the slide 6 is supported by a pair of upper and lower cylindrical sliding bearings 7 mounted on a frame, and is driven by a well-known crank drive (not shown). The fluid pressure cylinder device 'lyi11, which is moved in the vertical direction by a mechanism or an eccentric drive mechanism and is disposed behind the slide 6 (on the right side in the figure) and supported by a balance weight 9 and a support pusher 10, is configured as a T member. has been done. The fluid pressure cylinder device 11 has a pair of ear shafts 13
, consisting of a cylinder 12 having a fluid supply/discharge boat 14, 15, a piston 16, and a piston rod 17 integrated with the piston 16, the lower end of which can swing freely on a support @lB installed between the opposing walls 1A of the frame housing. The upper ends of the pair of support rods 1o supported by the support rods 1o are pivotally fitted into the pair of ear pads 13, so that the cylinder 12 is supported in a vertical position. It is supported by a holding rod 10. 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 has its boat 14.
By supplying and discharging fluid through the piston 15, the displacement can be adjusted with respect to the piston 16, 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 upward F 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.

Also, as the slide 6 moves up and down, the piston rod 1
7 and the cylinder 12 are supported by the support rod 1o@
The balance weight 9 attached to the tip of the piston rod 17 swings up and down using the piston rod 13 as a fulcrum.
The slide 6, which includes the upper mold 5, is kept in dynamic equilibrium. This dynamic balance system adjusts the position of the cylinder 12 with respect to the piston 16 by supplying and discharging fluid into and out of the cylinder 12 through the boats 14 and 15, and determines the position of the ear shaft 13, which is the pivot point of the piston rod 17. can be obtained by That is, when the weight (or weight) of the upper mold 5 is large, the cylinder 12 is moved toward the slide 6 side (Fig. 3), and when the weight gi (or ffffi) of the upper mold 5 is small, the cylinder 12 is moved toward the slide 6 side (Fig. 3). 12 to the balance weight 9 side (4th
figure).

The features of this embodiment are as follows.

■ Since the dynamic balance of the slide 6 including the upper die 5 is maintained, the occurrence of primary vibration caused by unbalanced inertia force is suppressed, and the difference in the heavy lifting (or quality lifting) of the upper die 5 is Regardless, the bottom dead center Iff degree is high, the life of the mold becomes longer, 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 the balance conversion parts such as the crank drive Ilm mechanism or the eccentric drive mechanism is reduced and the machine life is extended. In addition to improving the press perspiration ability, high-speed operation can be performed stably.

■ If the weight m (or weight) of the slide 6 including the upper mold 5 changes by replacing the upper mold 5, the cylinder 1
By supplying and discharging fluid to and from the piston rod 2, the position of the ear shaft 13, which is the fulcrum of the piston rod 17, can be adjusted and displaced, and the dynamic balance of the slide 6 (including the upper die 5) can always be accurately ensured, thereby reducing primary vibration. The occurrence of is effectively suppressed.

■ Adjustment of the position of the cylinder 12, that is, adjustment of the dynamic balance with respect to the slide 6, can be done by simply supplying and discharging fluid to the cylinder 12. This can be done as appropriate while checking the situation and the movement status of the moving body, and the press work can be performed in a quiet state with minimal imaging.

Effects of the Invention As is clear from the above description, the present invention provides a fluid pressure cylinder device in which a balance weight for balancing the unbalanced inertial force of a slide, which is a reciprocating body, is swingably connected to the slide at one end. It is attached to the other end of the piston rod that extends in both directions of the cylinder, and the cylinder of the fluid pressure cylinder device is swingably supported by a support rod in an upright position that is swingably supported by the frame. Since the balance weight is configured to move vertically in an antiphase relationship with the slide, the dynamic balance of the slide including the mold is maintained, and the balance weight can be displaced relative to the piston. 11 suppresses the occurrence of primary vibrations
J, the bottom dead center accuracy can be maintained at a high level regardless of the difference in the weight (or quality ffi) of the mold, the life of the mold can be extended, and product quality can be improved. The position of the cylinder that is the pivot point of the piston rod rt! 1 adjustment, that is, adjustment of the dynamic balance for the slide, is easy to operate because it only requires supplying and discharging fluid to the cylinder, and even while the press is operating, it can be adjusted depending on the machining situation. This can be done as appropriate while checking the motion status of the moving body, and press working can always be carried out in a quiet state with minimal vibrations.

[Brief explanation of the drawing]

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 of the mechanical press, and Figs. 3 and 4 are different adjustment states. FIG. 2 is a longitudinal sectional view similar to FIG. 1 showing a variable 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 shaft 14...Boat 15...16...Piston 17...Piston mouth

Claims (1)

[Claims] (1) In a mechanical press having a slide that is reciprocated in the vertical direction by a mechanical drive mechanism such as a crank drive mechanism or an eccentric drive mechanism, a cylinder, a piston, and a slide that penetrates the cylinder and extends in both directions of the cylinder. A cylinder of a fluid pressure cylinder device consisting of a piston rod is swingably connected at one end to the other end of a support rod which is swingably supported by a press frame, and supported by the support rod, and one end of the piston rod is supported by the support rod. A balance weight is attached to the other end of the piston rod, which is connected to the slide in a freely swinging manner and balances the unbalanced inertia force of the slide, which is a reciprocating body, so that the displacement of the cylinder relative to the slide can be adjusted. A variable dynamic balance device for a mechanical press, characterized in that the balance weight moves up and down in an antiphase relationship with respect to the slide.