JPH0532160B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the removal of unbalanced forces accompanying the rotational movement of a crankshaft and the reciprocating movement of a slide in a high-speed press machine.

[Prior Art] In a crank press used for pressing deformation or punching work by converting the rotational motion of the crankshaft into vertical and reciprocating motion, vibrations occur due to the unbalanced inertia force, and the faster the operation is, the more this vibration occurs. The trend is remarkable. Many measures have been taken to absorb this and ensure stable operation of the equipment.

For example, Japanese Patent Publication No. 59-50439 (a press machine that is dynamically balanced during high-speed rotation) provides opposing slides on eccentric parts with a 180° phase difference corresponding to the vertical reciprocating part (the slide with the upper mold attached).
There was also Japanese Patent Publication No. 60-18519 (balancing device for a press) in which first and second balancing weights were provided on the crankshaft via a gear mechanism.

In conventional presses where the number of strokes per unit time of the slide is small, it is sufficient to maintain static balance by using a pneumatic cylinder to lift the slide with a force equivalent to the total weight of the slide and upper mold, but the number of strokes is large. As the size increases, the unbalanced forces due to the rotation of the crankshaft, the unbalanced forces due to the rotation and rocking of the connecting rod, and the unbalanced forces due to the reciprocating movement of the slide and upper mold become larger, and it becomes necessary to balance these dynamically. .

Moreover, in the case of a single product (single mold), the fixed balance mechanism mentioned earlier can ensure standardization of work once it is set.
Many crank presses are required to be versatile enough to handle a wide variety of products, so the weight of the upper mold changes each time, and the weight of the balancer must also be changed accordingly, otherwise vibrations will occur. absorption is inevitably incomplete.

For this reason, JP-A-62-192298 (Balancer for reciprocating machines, Figure 9 A, B, C), which was published as a balance mechanism for high-speed presses and where versatility is widely required, is for balancers. crankshaft 8
A connecting rod 60 that supports one end of the balancer 1a in a vertically movable manner is connected to the reciprocating portion of the balancer 1a, and
The other end of the balancer 1a is rotatably supported by a fixed part of the main body frame, and its support point 61 is movable so that the support device can be changed.

As a result, the unbalanced force generated from a high-speed press is divided into a rotational unbalanced force and a reciprocating unbalanced force. The former is an unchanging effect determined by mechanical elements and is absorbed by a known balancer, and the latter absorbs the variable element. They succeeded in following the change in the center of gravity position of the second balancer.

[Problems to be Solved by the Invention] The conventional technology listed here is such that the second balancer 1a is connected to the crankshaft 81a as shown in FIG.
Since the load is applied directly below the center point of the balancer through the connecting rod 60, the connecting point 62 of the connecting rod has M _{3 ×} b( (distance between the connection point and the support point). Since one end of the balancer is directly lifted in this way, the other end is rotatably restrained by the frame, so unbalanced impacts are constantly applied to this support point intermittently. Furthermore, if we focus on the crankshaft itself, it has an eccentric part that directly suspends both the first and second balancers, so in order for this mechanism to function safely, the strength and rigidity of all members, including the crankshaft, must be maintained. Further improvements are desired, as there are many types of parts and their mutual relationships tend to be complex, so there are many check points for maintenance management, which can easily become cumbersome.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, it is an object of the present invention to provide a dynamic balance device for a general-purpose high-speed press machine, which has a simpler structure and reduces the concentration of impact in the manner in which a load is applied.

[Means for Solving the Problems] The dynamic balance device for a high-speed press according to the present invention includes a box-shaped slider 12 into which the wrist pin 5 is inserted, and a box-shaped slider 12 that is fitted into the slider 12 so that it can freely slide. Two supporting rods 1 are provided with an engaging holder 13 at one end and have a second balancer 1 fixedly attached to the other end.
1, two suspension supports 2 that bendably suspend the midpoints of the support rods 11, and two suspension supports 2 that are screwed in mutually opposite directions with internal threads in horizontal holes provided above the suspension supports 2. The above problem was solved by comprising a screw shaft 4 having a male thread 41 carved thereon, and a motor 43 which rotates the screw shaft 4 and is fixed to the press body.

[Function] The function of the dynamic balance device of the present application will be explained based on FIGS. 1 to 4 and FIG. 10 showing embodiments.

The wrist pin 5 is rotatably supported by two support rods 11A and 11B. That is, support rod 1
One end of 1A, 11B forms a holder 13 which is shaped like a four-legged desk and has a groove 14 in each leg,
A wrist pin is inserted therethrough, and a slider 12 having protrusions 15 on two upper and lower sides is slidably fitted into a groove 14 of the holder 13.

The remaining ends of the support rods 11A and 11B are fixed to the second balancers 1A and 1B, respectively, and in the end, both of the two support rods swing freely around the wrist pin to absorb the unbalanced force. .

The feature of this application is these two support rods 11A and 11B.
As is clear from the figures, in this embodiment, the hanging supports 2A and 2B are movable from the upper wall of the press body by extending and contracting the distance between the mutual supporting points 21A and 21B. Therefore, the distance e from the pins 21A, 21B, which are the fulcrums of the fishing support, to the central wrist pin 5 can be varied. In other words, as particularly well shown in FIG. 2, the fishing supports 2A and 2B have female threads of opposite pitch on the left and right in the circular holes penetrating the inside thereof, and male threads 41A and 41B to be screwed into these threads. One screw shaft 4
are passed through in common, so when this screw shaft 4 is rotated by the motor 43, the fishing supports 2A and 2B simultaneously move in opposite directions, and the distance between them decreases, or moves away from each other freely. be adjusted.

Changing the position of the fulcrum 21 that suspends the wrist pin 5 and the second balancer 1 immediately changes the load capacity of the second balancer, which adjusts the effect of absorbing unbalanced force to the optimal state. occurs.

[Example] The first example of the present application is as shown in FIGS. 1 to 4 and 10, and will be supplemented to avoid duplication with the above description. The drive unit 8 is located at the upper part of the press machine, and the crankshaft 81 has an eccentric part, and connecting rods 52A and 52B fitted to this eccentric part change the rotation of the crankshaft into eccentric rotation, and the crankshaft 81 is rotated through the wrist pin 5. It is transmitted as the vertical reciprocating motion of the slide 6.
In order to absorb rotational unbalance of the crankshaft 81, a first balancer 82 eccentrically positioned in the opposite direction of the crankshaft is fitted. As is known, a clutch 84 and a brake 83 are attached to both ends of the shaft. An upper mold 61 for pressing is mounted on the bottom of the slide 6 so as to face a lower mold 71 placed on a base 7. When we calculate the amount of movement of the fishing support 2 (Δe in Figure 3) with reference to Figure 4, we find that (1) (m ₁ ±m ₂ /m ₁ )×(e±Δe/e)=d×M (2) (m ₁ ± _{m 2} /m ₁ ) is the weight increase/decrease ratio (3) (e±Δe/ e) is an increase/decrease ratio with respect to the distance e corresponding to the slide weight m ₁ , that is, the product of equations (2) and (3) is always a constant value (d×M).

For example, when (m ₁ +m ₂ /m ₁ )=1.25, Δe may be set so that (e−Δe/e)=1/1.25=0.8.

FIGS. 5A and 5B show a related invention that achieves the same object, and shows a supporting point 21A of two supporting rods 11A and 11B,
This is a method in which the distance between 21B and the wrist pin 5 is extended or contracted using a link mechanism. This link mechanism includes two intermediate bodies 26A, 26B that are refractably connected to the middle of the support rods 11A, 11B, and a fishing support member 25A that is refractably suspended from the main body above the intermediate bodies 26A, 26B. , 25B, and link rods 27A, 2 which are bent downwardly and connected to the intermediate bodies 26A, 26B at one end and connected to each other by overlapping each other at the other end.
7B and a connecting member 28 that overlaps and connects both link rods. The connecting member 28 is moved up and down by the rotation of the motor 49 transmitted through the male screw 29 provided below, and the up and down movement changes the expansion angle of the link rod, eventually changing the position of the pins 21A and 21B to the center wrist pin 5. To move closer or further away.

In order to ideally implement the present invention, it is most desirable to combine the hardware means described so far with software means mainly for information processing. FIG. 6 is a conceptual diagram showing a vibration sensor 100 attached to the side of the base 7 of a high-speed press machine, and the vibrations of the machine captured here are replaced with electrical signals, converted into digital signals, and input into an electronic circuit 101. A reference value is stored in this circuit in advance and the two are compared to determine whether the motor 43 or 4
9, and the actual measurement of vibration and rotation of the electric motor are correlated and adjusted using an electronic circuit. A block diagram of these is shown in FIG. 7, and a flowchart is shown in FIG.

[Effects of the Invention] As described above, the present invention allows the vibration of the high-speed press machine itself to be reduced by slightly varying the fulcrum distance of the support rod without knowing the exact weight increase or decrease of the upper die attached to the slide. All you have to do is adjust it to the minimum, making it much easier to use than conventional presses. This adjustment can be easily performed even while the press is in operation, and by combining the drive source of the dynamic balance device, a computer, and a vibration sensor, automatic and precise adjustment can be made. This has the effect of providing new functions that far exceed the previous ones.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of the embodiment of the present application, FIG. 2 is a side view, FIG. 3 is a sectional view taken along the line X-X in FIG. ，
Figure 6 is a conceptual diagram of the applied technology of the present application, Figure 7 is a block diagram of information processing, Figure 8 is a flowchart, and Figure 9 is a side view of the related invention. Figures A, B, and C are a front view, a partial sectional view, and a conceptual diagram explaining the operation of the conventional technology.
This figure is a partially exploded perspective view of the embodiment shown in FIG. 1. 1...Second balancer, 2...Fishing support, 4...
Spiral shaft, 5... Wrist pin, 11... Support rod, 12...
... Slider, 13 ... Holder, 21 ... Fulcrum (pin), 25 ... Fishing support material, 26 ... Intermediate body, 27 ...
... Link rod, 28 ... Connection material, 29 ... Male thread,
41...Male thread, 43, 49...Motor, 81...
...Crankshaft, 82...First balancer.

Claims (1)

[Claims] 1. A high-speed press machine in which a wrist pin 5 for converting the rotational motion of a crankshaft 81 and transmitting it to the vertical reciprocating section is built into the main body, and the crankshaft is eccentric in a phase opposite to the eccentric direction of the crankshaft. In the dynamic balance device including the first balancer 82, the wrist pin 5
A box-shaped slider 12 into which the slider 12 is inserted, a holder 13 into which the slider 12 is fitted and slidably engaged are provided at one end, and a second balancer 1 is fixed to the other end. A support rod 11, two fishing supports 2 that bendably suspend the middle of the support rods 11, and female threads in horizontal holes provided above the fishing supports 2 are screwed together in opposite directions. A dynamic balance device for a high-speed press machine, comprising a screw shaft 4 having two male screws 41 carved thereon, and a motor 43 that rotates the screw shaft 4 and is fixed to a press body. 2. The first balancer 82 of a high-speed press machine, which has a built-in wrist pin 5 that converts the rotational motion of the crankshaft 81 and transmits it to the vertical reciprocating section, is eccentric in the opposite phase to the eccentric direction of the crankshaft. In the dynamic balance device equipped with, the wrist pin 5
A box-shaped slider 12 into which the slider 12 is inserted, a holder 13 into which the slider 12 is fitted and slidably engaged are provided at one end, and a second balancer 1 is fixed to the other end. a support rod 11, and two intermediate bodies 26 each bendably connected to the middle of the support rod 11;
A fishing support member 25 bendably suspends the upper part of the intermediate body 26 from the main body, and one end connects the intermediate body 26 downwardly in a bendable manner, and the other ends overlap and connect each other to form a link mechanism. Link rod 27 and link rod 2
7 and a connecting member 28 having a male thread 29 on the lower side, and a motor 49 which rotates a female thread screwed with the male thread 29 and is fixed to the main body. Dynamic balance mechanism.