JP3529224B2 - Dynamic equilibrium device of press machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dynamic balancing device of a press machine for obtaining a dynamic balance of inertial force when a slide moves up and down, and is particularly effective for a compact high speed automatic press.

[0002]

2. Description of the Related Art In a press machine, in addition to a static balancing device for balancing the weight of a slide including an upper die with the air pressure of an air cylinder, the dynamics of the slide generated by operating the press machine are also provided. A dynamic balancer is provided to eliminate the imbalance and prevent vibration from occurring.

Examples of such conventional dynamic balancers include Japanese Patent Publication No. 59-50439 and Japanese Patent Laid-Open No. 60-231600. In these dynamic balancers, near the both ends of the crankshaft. The vertical movement of the provided dynamic balance weight operates in the direction opposite to the vertical movement of the slide, thereby eliminating the dynamic imbalance of the slide caused by operating the press machine.

[0004]

In these conventional techniques, the guide means for guiding the vertical movement of the weight for dynamic balancing is affected by the thermal deformation of the frame due to heat generation, and therefore impedes high-speed rotation. .

An object of the present invention is to solve the above-mentioned problems and to provide a dynamic balancing device which is advantageous for high speed rotation of a press machine.

[0006]

In order to solve the above-mentioned problems, the present invention provides

One of the two guide posts fixed to the frame of the press machine is fixed to the upper and lower sides of the frame of the press machine, and two upper and lower ends of the dynamic balancing weight are provided.
It is slidably fitted into the cylindrical hole of the bearing that is fixed at the place.

The other guide post is fixed to either the upper part or the lower part of the frame of the press machine, and slidably fits the oblong hole of the bearing fixed to the dynamic balance weight. To do. The guide post guides the vertical movement of the dynamic balancing weight.

Alternatively, the other guide post is fixed to the upper and lower sides of the frame of the press machine and is movable along the square groove provided at the upper end and the lower end of the dynamic balancing weight. A block is provided and slidably fitted in a cylindrical hole provided in this bearing block. The guide post, the bearing and the bearing block guide the vertical movement of the dynamic balancing weight.

As a result, a dynamic balancer which is not affected by thermal deformation of the frame is constructed.

[0011]

1 and 2 show a first embodiment of a dynamic balancing device for a press machine according to the present invention. Rolling bearing 9 and slide bearing 1 provided on frame 1A of press machine 1
The crankshaft 2 that engages with 0 is provided with a first eccentric portion 2A that rotatably connects the connecting rod 3 that is connected to the slide 13.

Adjacent to both sides of the first eccentric portion 2A, the phase is changed by 180 degrees with the first eccentric portion 2A, and the eccentric amount is the same as that of the first eccentric portion 2A. Of the second eccentric portions 2B and 2C having the same mass as that of the first eccentric portion 2A
To provide. By making the first eccentric portion 2A and the second eccentric portions 2B and 2C have the same mass, the amount of unbalance due to the rotation of the crankshaft 2 is eliminated.

Drive rods 4A and 4B are rotatably provided on the second eccentric portions 2B and 2C of the crankshaft 2, and are connected to a dynamic balancing weight 7 by a pin 8. The dynamic balancing weight 7 has two bearings 6A each having a cylindrical hole at the top and bottom so that a minimum clearance can be maintained even if the frame 1A of the press machine 1 is thermally deformed, and the other is slightly long. A bearing 6B having a hole-like hole is fixed, and a guide post 5A fixed on the upper and lower sides of the frame 1A and the frame 1A.
Is guided by the guide post 5B fixed only to the upper part of the.

In the first embodiment, the guide post 5B is fixed to the upper portion of the frame 1A.
It may be fixed to the lower part of A. Further, the bearings 6B may be fixed above and below the dynamic balance weight, and the guide posts 5B may be fixed above and below the frame 1A.

The flywheel 1 provided at one end of the crankshaft 2 by the power transmitted from a power source (not shown).
When the crankshaft 2 rotates via the clutch 1 and the clutch / brake 12, the slide 13 moves up and down via the connecting rod 3 connected to the first eccentric portion 2A. At the same time, the dynamic balancing weight 7 moves up and down by 180 degrees out of phase with the slide 13 via the drive rods 4A and 4B connected to the second eccentric portions 2B and 2C.

As a result, the dynamic imbalance of the slide 13 caused by the operation of the press machine 1 is eliminated, and the occurrence of vibration is prevented. Further, since there is no deformation due to the dynamic unbalanced force of the crankshaft 2, even if the stroke number of the press machine is changed, the change in the bottom dead center position of the slide 13 is limited to the deformation of the connecting rod 3. Less.

Further, due to the temperature rise of the frame 1A,
Even if the mounting pitch of the guide posts 5A, 5B of the dynamic balancing weight 7 is changed, one of the bearings 6A, 6B escapes in the pitch extension direction, so that the frame 1A should be operated without being affected by thermal deformation. Can be done.

In the second embodiment shown in FIG. 3, the drive rod integrally formed in the first embodiment is divided into an upper rod 24A and a lower rod 24B to form a drive rod 24.

Two guide posts 25A and 25B are also provided.
Is fixed above and below the frame 21A of the press machine 21, and one guide post 25A has a bearing 26 fixed at two positions, the upper end and the lower end of the dynamic balancing weight 27.
It is slidably fitted in the cylindrical hole of.

The other guide post 25B is provided with a bearing block 31 which is movable along the square grooves 27A and 27B provided at the upper end and the lower end of the dynamic balancing weight 27. It is slidably fitted in the cylindrical hole provided in the. The bearing block 31 is fixedly installed by a pressing plate 32, and the bearing block 31 and the guide post 2 are protected against thermal deformation between the guides of the frame 21A of the press machine 21.
It is configured so that the center of 5B can be maintained.

[0021]

As is apparent from the above description, according to the present invention,

Since the guide means of the dynamic balancing weight is constructed so as not to be affected by thermal deformation of the frame of the press machine, stable press operation can be performed even at high speed rotation.

[Brief description of drawings]

FIG. 1 is a front sectional view of a dynamic balancer according to a first embodiment of the present invention.

FIG. 2 (a) is a side sectional view of an essential part of the dynamic balancer according to the first embodiment of the present invention. (B) Similarly, is a top sectional view of a guide post part of the dynamic balancer.

FIG. 3 (a) is a side sectional view of a main part of a dynamic balancer according to a second embodiment of the present invention, and FIG. 3 (b) is a top sectional view of a guide post part of the dynamic balancer.

[Explanation of symbols]

1 is a press machine, 1A is a frame, 2 is a crankshaft, 3
Is a connecting rod, 4A and 4B are drive rods, 5
A and 5B are guide posts, 6 is a bearing, 7 is a weight for dynamic balancing, 8 is a pin, 9 is a rolling bearing, 10 is a sliding bearing,
11 is a flywheel, 12 is a clutch / brake, 1
3 is a slide, 21 is a press machine, 21A is a frame,
24 is a drive rod, 24A is an upper rod, 24B is a lower rod, 25A and 25B are guide posts, 27 is a dynamic balancing weight, 27A and 27B are square grooves, 28 is a pin, 31 is a bearing block, and 32 is a holding plate. ,.

Claims (2)

(57) [Claims] Claim: What is claimed is: 1. A dynamic balance weight for converting the rotation of a crankshaft into a reciprocating motion and driving the crankshaft in the direction opposite to the vertical movement of the slide to operate the press machine. It is a dynamic balancing device of a press machine for canceling the balance. (1) The crankshaft is provided with a first eccentric part that rotatably connects a connecting rod connected to a slide. (2) Adjacent to both sides of the first eccentric part of the crankshaft, the first
A second eccentric portion is provided, which is 180 degrees out of phase with the eccentric portion, has the same eccentric amount as the first eccentric portion, and has the same total mass on both sides as the mass of the first eccentric portion. (3) A dynamic balancing weight that is vertically movable by being guided by a guide post fixed to the frame of the press machine is provided. (4) The second eccentric part is provided with a drive rod which is rotatable at one end and which is integrally or divided, and the other end of the drive rod is connected to the dynamic balancing weight. Consist of above
In the dynamic equilibrium device for a press machine, (a) two guide posts are provided, one of which is fixed above and below the frame of the press machine, and two of the upper end and the lower end of the dynamic balance weight are provided. It is slidably fitted into the cylindrical hole of the bearing that is fixed at the place. The guide post guides the vertical movement of the dynamic balancing weight. (B) The other guide post is fixed to either the upper part or the lower part of the frame of the press machine, and slidably fits the oblong hole of the bearing fixed to the dynamic balancing weight. To do. The guide post guides the vertical movement of the dynamic balancing weight. A dynamic equilibrium device for a press machine, comprising the above (a) and (b). 2. A dynamic balance weight, which is driven by converting the rotation of a crankshaft into a reciprocating motion and driving the same, in the direction opposite to the vertical movement of the slide to operate the press machine. It is a dynamic balancing device of a press machine for canceling the balance. (1) The crankshaft is provided with a first eccentric part that rotatably connects a connecting rod connected to a slide. (2) Adjacent to both sides of the first eccentric part of the crankshaft, the first
A second eccentric portion is provided which is 180 degrees out of phase with the eccentric portion, has the same eccentric amount as the first eccentric portion, and has the same total mass on both sides as the mass of the first eccentric portion. (3) A dynamic balancing weight that is vertically movable by being guided by a guide post fixed to the frame of the press machine is provided. (4) The second eccentric portion is provided with a drive rod which is rotatable at one end and which is integrally or divided, and the other end of the drive rod is connected to the dynamic balancing weight. Consist of above
In the dynamic equilibrium device for a press machine, (a) two guide posts are provided, one of which is fixed above and below the frame of the press machine. It is slidably fitted into the cylindrical hole of the bearing that is fixed at the place. The guide post guides the vertical movement of the dynamic balancing weight. (B) The other guide post is fixedly installed above and below the frame of the press machine, and has bearing blocks that can move along the square grooves provided at the upper end and lower end of the dynamic balancing weight. It is provided and slidably fitted in a cylindrical hole provided in this bearing block. The guide post and the bearing block guide the vertical movement of the dynamic balancing weight. A dynamic equilibrium device for a press machine, comprising the above (a) and (b).