JPH065035Y2 - Dynamic balancer for press machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a dynamic balancing device of a press machine that cancels out inertia generated when a slide is driven.

[Conventional technology]

In a conventional press machine, a large-sized slide having a mold attached thereto is moved up and down to press-form a work. Therefore, when the slide is moved up and down, a large inertia is generated in the slide.

For this reason, in the past, a dynamic balancer (dynamic balancer) that operates in the opposite direction to the slide to cancel the above inertia
Is provided to prevent the occurrence of vibration due to inertia.

Further, the conventional dynamic balancer has a structure in which a balance weight c is provided on the main shaft a for vertically moving the slide by changing the phase from the slide driving eccentric shaft b by 180 ° as shown in FIG. .

[Problems to be solved by the invention]

However, when the phase of the eccentric portion is changed by 180 °, the radial dimension of the eccentric shaft increases, which increases the material cost when manufacturing the eccentric shaft, and cannot be incorporated into the eccentric shaft without dividing the connecting rod. A lot of man-hours are required for manufacturing and assembling the connecting rod.

In addition, when the eccentric shaft is incorporated into the press body, a large hole must be opened in the body frame due to the large radial dimension, which reduces the rigidity of the body frame and affects the machining accuracy, and separates the eccentric part. Since it has to be machined in such a way, there is a problem that a large number of man-hours are required for machining.

[Means and Actions for Solving Problems]

The present invention has been made for the purpose of improving the above-mentioned problems, and in a press machine in which a slide driving eccentric shaft provided on a main shaft moves a slide up and down via a connecting rod, the main driving shaft has a slide driving eccentric shaft. An eccentric shaft for driving a balanced weight is provided in the same phase as, and one end side of the first link is connected to this eccentric shaft, and the other end side of the first link has an intermediate portion pivotally supported at an arbitrary link ratio. By providing a balance weight pivotally attached to one end side of the second link and rotating left and right opposite to the other end side of the second link, the structure of the main shaft is simplified to facilitate manufacture and assembly. The present invention aims to provide a dynamic balancer for a press machine designed to meet the above requirements.

〔Example〕

 An embodiment of the present invention will be described in detail with reference to the drawings.

In the figure, reference numeral 1 is a press main body, and a crown 5 accommodating a slide drive mechanism 4 is provided between upper parts of an upright 3 standing upright on both sides of a bolster 2.

The slide drive mechanism 4 has a pair of main shafts 6 which are rotated in opposite directions by a main motor (not shown), and these main shafts 6 have an eccentric shaft 6a for slide drive.
Further, the eccentric shafts 6b for driving the balanced weights are provided in the same phase.

An annular portion 7a formed on one end side of the connecting rod 7 is slidably fitted to the outer peripheral portion of the slide driving eccentric shaft 6a, and a spherical portion 7b formed on the other end side of the connecting rod 7 is , Is connected via a point 9 of a slide 8 which is guided by a slide gib 3a laid on the upright 3 and is vertically movable.

The annular portion 10a formed at one end of the first link 10 to the outer periphery of this than the radius r ₂ is greater equilibrium weight drive eccentric shaft 6b with respect to the radius r ₁ of the slide drive eccentric shaft 6a The second links 1 that are slidably fitted together, the other ends of the respective first links 10 are combined in a substantially X-shape, and the intersections are supported by the pins 11 on the press body 1 side.
Pins 13 are pivotally attached to one end side of 2.

The second link 12 has the first to the first pins 11 that support the intersection.
The distance ₂ from the pin 11 to the other end is larger than the distance ₁ to the pin 13 connecting the link 10, and W ₂ = r ₁ / r ₂ × at the other end of these second links 12. the upper end of the _1/2 × W ₁ weight W ₂ of the balanced weight 15 calculated from is attached.

Reference numeral 16 in the figure denotes a balancer provided between the bracket protruding from the slide 3 and the upper portion of the press body 1.

Next, the operation will be described. With the rotation of the main shaft, the slide 8 is moved up and down via the connecting rod 7, and an upper mold attached to the slide 8 and a lower mold provided on the bolster 2 (both not shown). When the slide 8 is moved downward while being used for forming the work, the first link 10 is also moved downward by the balance weight driving eccentric shaft 6b provided in the same phase as the slide driving eccentric shaft 6a. Accordingly, the second link 12 has a pin 1
Since it is rotated about 1, the balance weight 15 provided at the other end of the second link 12 is rotated in the opposite direction of the slide 7, that is, upward.

Further, the balance weight 15 is moved downward when the slide 7 is raised, whereby the inertia generated when the slide 7 is moved vertically can be offset by the balance weight 15 that operates in the opposite direction to the slide 7. Link ratio of link 12
By increasing ₁ : ₂ , the balance inertia weight 15 having a smaller weight W ₂ than the weight W ₁ of the slide 7 can sufficiently offset the slide inertia. Further, the balance weight 15 is divided into a plurality of pieces, and the divided pieces are provided so as to be detachable from each other so that the weight can be adapted to the weight of the upper die mounted on the lower surface of the slide 8.

[Effect of device]

As described in detail above, in this invention, the eccentric part of the slide driving eccentric shaft and the eccentric part of the balanced weight driving eccentric shaft have the same phase, so compared to the conventional one in which the phase is different by 180 °. Since the radial dimension of the eccentric shaft can be significantly reduced, the material cost for manufacturing the eccentric shaft can be reduced.

Also, by making the eccentric part in the same phase, the connecting rod can be assembled into the eccentric shaft without splitting, so that the connecting rod can be easily manufactured and assembled, and even when the eccentric shaft is assembled into the press main body, it is opened in the main frame. The hole that has a phase of 1
It may be smaller than the one changed by 80 °, which increases the rigidity of the main body frame, thereby improving the processing accuracy during press molding.

Moreover, since the eccentric portion has the same phase, the eccentric portion only needs to be processed once, so that the eccentric shaft can be easily manufactured.

[Brief description of drawings]

The drawing shows one embodiment of the present invention, FIG. 1 is an overall configuration diagram, FIG. 2 is a schematic diagram of this apparatus, FIG.
FIG. 4 is an arrow view from the IV direction in FIG. 3, and FIG. 5 is a conventional explanatory view. 6 is a main shaft, 6a is a slide driving eccentric shaft, 6b is a balanced weight driving eccentric shaft, 7 is a connecting rod, 8 is a slide,
10 is a first link, 12 is a second link, and 15 is a balanced weight.

Claims (2)

[Scope of utility model registration request] 1. In a press machine in which a slide drive eccentric shaft 6a provided on a main shaft 6 moves a slide 8 up and down through a connecting rod 7, the main shaft 6 has the same phase as the slide drive eccentric shaft 6a. Eccentric shaft 6 for driving balanced weight
b is provided, one end side of the first link 10 is connected to the eccentric shaft 6b, and the other end side of the first link 10 has one end of a second link 12 in which an intermediate portion is pivotally supported at an arbitrary link ratio. A dynamic balancing device for a press machine, which is provided with a balancing weight 15 pivotally mounted on the side and pivoting on the other end side of the second link 12 so as to face left and right. 2. The dynamic balancing apparatus according to claim 1, wherein the balancing weight 15 is divided into a plurality of pieces and is composed of split pieces that are detachable from each other.