JPH0340476Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to improvements in mechanical presses, particularly presses using cams.

Conventional technology and its problems As a dynamic balancing means for the movement of the slide in a press machine and the die set attached thereto, an eccentric part is provided in the opposite direction to the eccentric part of the crankshaft at a position symmetrical to the eccentric part of the crankshaft. There is a way to make a mass shake. Such a method is described, for example, in Japanese Patent Publication No. 54-24749. However, in conventional press machines, an eccentric part is provided that is eccentric in one direction symmetrical to the crankshaft with respect to the rotation center of the input shaft, so dynamic unbalanced force is generated in directions other than the direction of slide movement. In high-speed presses, the vibrations exerted on the frame due to the dynamic unbalanced force can no longer be ignored.

Means for Solving the Problems According to the present invention, a press machine includes a frame, a horizontal input shaft rotatably supported by the frame, and rotationally driven by a drive device.
Cam means consisting of first, second, and third cams provided at intervals on the input shaft and each having a concentric relationship with the input shaft, the cam being located at the center of the three cams. The third cam includes a cam means having a protrusion 180 degrees opposite to the protrusions of the first and second cams on both sides thereof, and the cam surface of each cam of the cam means has the same shape. , the cam surface has a shape that approximates a regular polygon with the number of convex portions being 2n+1 (n is a positive integer), and the shape of each cam surface portion corresponding to each side of the regular polygon is They are identical to each other, and are provided in the frame so as to be movable up and down in a state surrounding and engaging each cam of the cam means, so that the first, second, and third cams can be moved up and down by rotation of the input shaft. First, second, and third follower slides that reciprocate up and down following the respective rotational movements of the cam, and among these follower slides, the first,
a single actuating slide fixed to the bottom of the second follower slide and supporting a movable die; and a stationary slide fixed to the bottom of the frame and cooperating with said movable die to perform the stamping process. die means;
The third follower slide is not connected to the operating slide and is configured to move up and down independently, and the third follower slide is connected to the first and second follower slides. The present invention is characterized in that it includes a mass body for equalizing the total weight of the movable part including the joint slide, the actuating slide connected to the first and second follower slides, and the movable die.
Therefore, since the first and second follower slides and the third follower slide operate at opposite timings, the unbalanced force in the rotational direction acting on the input shaft is reduced, and the direction of movement of the slide is reduced. Dynamic balance can be achieved. In particular, in the present invention, each cam is arranged concentrically with the input shaft, and each cam has a shape approximating the regular polygon as described above, so that the members driven by the cams are The movement becomes smoother, and the unbalanced force in the rotational direction that acts on the input shaft is reduced. Furthermore, since the slide reciprocates 2n+1 times per revolution of the input shaft, the press can be operated at high speed.

EXAMPLES Hereinafter, the present invention will be described by way of examples with reference to the accompanying drawings.

Referring to FIGS. 1 and 2, the press machine according to the present invention shown here includes a frame 1, which is supported by supports 2 on a fixed surface such as a floor. The frame 1 is divided by a substantially central partition wall 3 into an upper crown portion or operating portion 1a and a lower base portion or processing portion 1b.

An input shaft 4 is mounted horizontally across the upper operating portion 1a of the frame 1, and this input shaft 4 is rotatably supported by a bearing 5 mounted on the frame 1. One end of the input shaft 4, the left end in FIG. 1, is a clutch device 6 fixed to the side of the frame 1.
This clutch device 6 includes a conventional clutch and a flywheel (not shown), and an electric motor 7 fixed to the top surface of the frame 1 is drivingly connected to this via a belt 8. It has been done,
The whole constitutes a drive device. The opposite end of the input shaft 4 (ie, the right end in FIG. 1) is connected to a brake device 9, which is also fixed to the opposite side of the frame 1. With this arrangement, the input shaft 4 can be rotated and stopped by fully utilizing the clutch device 6 and the brake device 9 without stopping the electric motor 7.

Three cams, ie, a first cam 10, a third cam 11, and a second cam 12 from the left in FIG. 1 are provided on the input shaft 4 at intervals. These cams may be formed on the input shaft, or may be separate cams fitted onto the input shaft. In the illustrated embodiment, each cam has three protrusions, as best seen in FIG.
That is, it is divided into three parts, and has a shape that approximates a regular polygon. To explain this in more detail, first, the shapes of the cam surfaces of the three cams are the same. And that cam surface is
It has a shape that approximates a regular polygon with the number of convex portions being 2n+1 (n is a positive integer). Further, the shapes of the cam surface portions corresponding to each side of the regular polygon are the same. That is, in the illustrated embodiment, n=1, and the cam surface has a shape approximating an equilateral triangle with three convex portions. The cam surface consists of three cam surface portions corresponding to each side of an equilateral triangle, and each cam surface portion has the same shape. This shape of the cam helps to reduce the amount of unbalance in the rotational direction of the input shaft. If the shape of the cam is divided into three or more parts, the shape of the cam will inevitably be close to a circle, and the movement of the driven member will be smooth, so the unbalanced force will be small. It will become.

Hollow first, second, and third follower slides 13, 15, and 14 are installed to surround each of the first, second, and third cams 10, 12, and 11, respectively. The joint slides 13, 14, 15 have upwardly projecting short shafts 16, 17, 18 and downwardly projecting operating shafts 19, 20, 21. The upwardly protruding short shafts 16, 17 of each follower slide 13, 14, 15,
18 protrudes into respective recesses 22, 23, and 24 provided on the inner surface of the top wall of the frame 1, and is slidably supported by metals 25, 26, and 27, respectively. 1st and 2nd follower slide 1
The downwardly protruding operating shafts 19 and 21 of 3 and 15 penetrate through the respective through holes 28 and 30 provided in the partition wall 3 and protrude into the lower processed portion, that is, the base portion 1,
Their lower ends are connected to an actuating slide 31. This operating slide 31 supports a movable die 32. This movable die 32 cooperates with a stationary die 34 on a bolster 33 fixed to the inner bottom surface of the base portion 1b of the frame 1 to perform press working in a well-known manner.

The downwardly protruding operating shaft 20 of the third follower slide 14 located between the first and second follower slides 13 and 15 also passes through a through hole 29 provided in the partition wall 3, and its lower end is connected to the operating slide 31. are not connected,
This third follower slide 14 can reciprocate up and down independently of the other two follower slides 13 and 15. Each through hole 28, 29, 30 also has metal 35,
36, 37 are attached, and the downward protruding operating shafts 19, 2 of the corresponding follower slides 13, 14, 15
0 and 21 are slidably supported. In addition, the third
The frame base portion 1b side of the through hole 29, which receives the operating shaft 20 of the follower slide 14, is covered with a cover 38.

first, second, third follower slides 13, 15,
14 each has a pair of vertically spaced horizontal shafts 40,
A roller 43 rotatably supported by 42, 41,
45, 44, and these rollers 43, 4
5 and 44 are always engaged with the corresponding cam,
When each cam rotates with the rotation of the input shaft 4, the corresponding follower slide reciprocates up and down.

The first and second cams 10 and 12 are arranged in the same phase. For example, they are located at the same time as shown in FIG. On the other hand, the protrusion of the third cam 11 corresponds to the corresponding protrusion of the first and second cams 10 and 12, for example, the lower roller 4 in FIG.
It is 180 degrees opposite to the convex part that engages with 5,
When the first and second cams 10 and 12 lower the corresponding follower slides 13 and 15 as shown in FIGS. 1 and 2, the third cam 11 raises the third follower slide 14. let That is, the first and second follower slides 13.15 and the third follower slide 1
4 move up and down at opposite timings.

Further, as shown in FIG. 2, on the side surface of the third follower slide 14, first and second cams 10,
2. A mass body 46 is attached to make the weight of the third follower slide 14 equal to the total weight of the operating slide 31 supporting the first and second follower slides 13, 15 and the movable die 32. It is designed to dynamically balance the up and down reciprocating motion with the opposite timing of the node slide. In FIG. 2, the mass 46 appears to be attached to the side of the second follower slide, but in reality, all follower slides have the same vertical cross-sectional shape, so in FIG. 3
It will be appreciated that the follower slide 14 is shadowed by the second follower slide 15 so that only the mass 46 attached thereto is visible. In addition, mass body 4
6 is preferably removable, since the die set attached to the operating slide 31 may have a different weight each time the contents of the press work are changed.

Here, the conditions for achieving dynamic equilibrium are:
It is preferable that the stroke and weight of each slide have the following relationship. That is, the weight of the first follower slide is W ₁ (Kg), the weight of the second follower slide is W ₂ (Kg), the weight of the operating slide is W ₃ (Kg), and the weight of the movable die is W ₄ (Kg). ), the weight of the third follower slide is W ₅ (Kg), the weight of the mass body is W ₆
(Kg), the total weight of the third follower slide and other components excluding the mass body is W ₇ (Kg), the stroke of the operating slide is S ₁ (mm), the stroke of the third follower slide is S ₂ (mm ), then W ₇ = W ₅ + W ₆ ; S ₁ (W ₁ + W ₂ + W ₃ + W ₄ ) = S ₂ · W ₇ ; S ₁ = S ₂ .

Effects of the invention With the above configuration, the excitation force in the direction of movement of the slide is balanced by the third follower slide and the mass body attached to it, and the unbalanced force acting in the direction of rotation of the input shaft can also be reduced, resulting in wear and tear on the bearing part. It is possible to extend the life of the press machine and perform press processing with high precision.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing an embodiment of a press according to the present invention. FIG. 2 is a vertical sectional view taken in a plane perpendicular to the plane of the paper of FIG. In the figure, 1...frame, 2...post, 4
...Input shaft, 5...Bearing, 6...Clutch device,
7...Electric motor, 9...Brake device, 10,1
1,12...cam, 13,14,15...follower slide, 25,26,27...metal, 31...
Operating slide, 32...Movable die, 33...Bolster, 34...Stationary die, 35, 36, 37...
Metal, 43, 44, 45...Roller, 46...
Mass body.

Claims (1)

[Scope of utility model registration request] a frame, a horizontal input shaft rotatably supported by the frame and rotationally driven by a drive device; The cam means is composed of a first, second, and third cam, and the third cam located in the center of the three cams is in contact with the convex portions of the first and second cams on both sides thereof.
cam means having protrusions facing 180 degrees in opposite directions;
The cam surfaces of each cam of the cam means have the same shape. The shapes of the cam surface portions corresponding to each side of the polygon are the same, and the cam surface portions are provided in the frame so as to be movable up and down, surrounding and engaging with each cam of the cam means. , first, second, and third follower slides that reciprocate up and down following the respective rotational movements of the first, second, and third cams caused by the rotation of the input shaft, and these follower slides. a single actuating slide secured to the lower portions of the first and second follower slides and supporting the movable die; and a single actuating slide secured to the bottom of the frame;
a stationary die means for performing press working in cooperation with the movable die; The three follower slides transfer their third follower slide to the total weight of the movable part including the first and second follower slides, the actuating slide connected to the first and second follower slides, and the movable die. A press machine characterized by comprising a mass body for equalization.