JPH0353830Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a press machine, and more particularly, to a press machine that increases the strength and rigidity of a frame.

(Prior Art) Conventionally, press machines having a C-shaped frame have been mainly used in consideration of workability.

(Problems to be Solved by the Invention) Incidentally, in a press machine having a C-shaped frame, a plurality of tie rods are fixedly provided, for example, on both sides of the frame in order to increase the strength and rigidity of the frame.

However, even if a plurality of tie rods are fixedly provided on both sides of the frame to increase the strength and rigidity of the frame, there is still the problem that the upper part of the front side of the frame deforms upward during repeated press working. be. That is, there is a drawback that the distance between the bolster provided at the bottom of the frame and the bottom dead center of the slide provided at the top of the frame changes slightly, which affects machining accuracy.

SUMMARY OF THE INVENTION An object of the present invention is to provide a press machine in which the deformation of the frame is reduced and the amount of deformation of the frame can be adjusted in order to improve the above-mentioned problems.

[Structure of the invention] (Means for solving the problem) In order to achieve the above object, the present invention fixes the upper part of the tie rod to the upper side of the C-shaped side frame that supports the slide so that it can move up and down. At the same time, the lower part of the tie rod is fixed to the lower side of the side frame, and a pair of leaf springs or links whose upper and lower ends are connected to the upper and lower parts, respectively, are arranged close to each other or It is provided with an external force applying device that can be freely adjusted in the direction of separation.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

Referring to FIGS. 1 and 2, a fixed table 5 is attached to the lower part of C-shaped side frames 3R and 3L in a mechanical press 1, which is an example of a press machine. A bolster 7 is placed and fixed.

On the other hand, a drive section 11 for vertically moving the slide 9 is attached to the upper part of the side frames 3R, 3L, and a crankshaft 13 of the drive section 11 extends in the left-right direction in FIG. There is. The slide 9 and the crankshaft 13 are connected by a connecting rod 15.

Incidentally, the crankshaft 13 is connected to the drive section 11.
It is designed to be driven and rotated by a drive source (not shown).

As shown in FIG. 1, the slide 9, which is moved up and down in the up and down direction,
Slide guide 17R, 1 installed inside the
Guided by 7L.

With the above configuration, the work to be machined is placed on the bolster 7, and the slide 9 is moved up and down via the connecting rod 15 by driving and rotating the crankshaft 13 by a drive source (not shown) in the drive unit 11. The workpiece is then subjected to a predetermined pressing process.

A plurality of tie rods 19R, 19L are provided on both sides of the C-shaped side frames 3R, 3L to increase the strength and rigidity of the side frames 3R, 3L.
are provided, and the tie rods 19R, 19L are fixed to the side frames 3R, 3L, respectively, by welding or the like at the upper and lower ends, for example. Moreover, the tie rods 19R and 19L are as shown in FIG.
It is provided on the left side in FIG. 2, ahead of the neutral axis L in the front-rear direction of the side frames 3R, 3L.

Tie rod 19L for side frame 3L
Since the installation is almost the same as the installation of the tie rod 19R to the side frame 3R, the explanation will be omitted.

The tie rods 19R fixed by welding or the like at the upper and lower ends of the side frame 3R are attached to the upper part 2 as shown in FIGS. 2, 3, and 4.
1 and a lower part 23. That is, the upper part 21 and the lower part 23 are separated at an appropriate interval, and on both sides of the upper part 21 and the lower part 23 of the tie rod 19R at the separated part, a tension member is provided. For example, leaf springs 25 and 27 are fixed at a predetermined length by welding or the like at their upper and lower ends in close contact with each other as shown in FIG.

Furthermore, a hole 29 is bored in a portion of the leaf spring 27 corresponding to the space, and a female thread is formed in the hole 29. A bolt 31, which is a screw device serving as an external force applying device, is screwed into the female thread from the right side in FIG.
The tip of the spring 1 is in contact with the inner surface of the leaf spring 25.

With the above configuration, by rotating the bolt 31 clockwise with a jig, for example, the bolt 31 is pressed away from the inner surface of the leaf spring 25 in FIG. 3, that is, to the left, The leaf spring 25 bends to the left as shown by the arrow in FIG. 4, and since the leaf springs 25 and 27 are fixed to the tie rod 19R at their upper and lower ends, the leaf spring 27 also bends to the right as shown by the arrow. Along with that, Tyrod 19
The upper portion 21 and lower portion 23 of R are each pressed inward as shown by the arrows.

For example, as shown in FIG. 2, a limit switch 35 is provided on a part of the lower surface of the slide 9 as a detection device 33 for setting the pressing force of the tie rod 19R, and a bolster 7 corresponding to the limit switch 35 is provided. Dog 37 in position
is provided. By lowering the slide 9 and bringing the limit switch 35 into contact with the dog 37 of the bolster 7, the distance between the bolster 7 and the bottom dead center of the slide 9 is constantly detected.

Therefore, an appropriate pressing force or preload is applied to the tie rod 19R by rotating the bolt 31 as an external force applying device clockwise in advance, thereby preventing the side frame 3R from opening due to deformation during machining. Also, during processing,
The bolster 7 is in each case detected by the detection device 33.
The distance between the slide 9 and the bottom dead center of the slide 9 is detected, and the preload on the tie rod 19R is adjusted based on the detected amount.

As a result, deformation of the side frames 3L, 3R can be reduced, and even if deformation of the side frames 3R, 3L occurs, it can be adjusted each time, so processing accuracy is improved compared to the conventional method.

An alternative embodiment to that in FIG. 3 is shown in FIG.
In FIG. 5, the same parts as those explained in FIG. 3 will be described using the same reference numerals.

In FIG. 5, support plates 39 and 41 are fixed to a portion of each of the upper portion 21 and lower portion 23 of the tie rod 19R by, for example, welding. Between the support plates 39 and 41 on both sides of the tie rod 19R, first links 43R and 43L, second links 45R and 45L and third links 47R and 47L are connected to the support plate 39.
They are connected with pins etc. in order from the sides.

Moreover, the second links 45R and 45L are connected to the upper portion 21 and lower portion 23 of the tie rod 19R, respectively.
It is provided in parallel to the upper part 21 and the lower part 23, and is provided in a space provided between the upper part 21 and the lower part 23.

Furthermore, a hole 49 is bored in the second link 45R in the left-right direction in FIG. 5, a female thread is formed in the hole 49, and a bolt 51 is screwed into the female thread.

With the above configuration, when the bolt 51 is rotated clockwise with a jig or the like, the second link 45L
is pressed to the left as shown by the arrow, the second link 45R is pressed to the right as shown by the arrow, and the upper portion 21 and lower portion 23 of the tie rod 19R are pressed inward, respectively.

Therefore, while applying a predetermined preload to the tie rods 19R and 19L, the detection device 33 explained in FIG. The distance is detected and the preload on the tie rods 19R and 19L is adjusted based on the detected amount.

Another embodiment alternative to FIG. 3 is shown in FIG. In FIG. 6, the same parts as those explained in FIG. 3 will be described using the same reference numerals.

In FIG. 6, the upper part 21 and the lower part 23 of the tie rod 19R are separated at an appropriate interval, and both sides of the upper part 21 and the lower part 23 of the tie rod 19R at the separated part are separated. is, for example, a leaf spring 2 as a tension member.
5 and 27 have a predetermined length and are fixed at the upper and lower ends by welding or the like. Moreover, a leaf spring 25 is provided in the spaced portion.
A cylinder 53, such as an air cylinder, is provided for pressing the cylinders 27 in the left and right directions, respectively.
The piston rods 55, 57 of the cylinder 53 abut against the inner surfaces of the leaf springs 25, 27 at their substantially central, outwardly curved portions.

With the above configuration, when the cylinder 53 is actuated, the piston rods 55 and 57 are bent in the left and right direction while in contact with the inner surfaces of the leaf springs 25 and 27, thereby causing the upper portion 2 of the tie rod 19R to
1 and the lower portion 23 are pressed inward, and a preload can be applied in advance to reduce deformation of the side frames 3R, 3L.

Therefore, if a preload is given to the tie rods 19R and 19L in advance by the operation of the cylinder 53, or the distance between the bolster 7 and the bottom dead center of the slide 9 is detected by the detection device 33, and the position has changed from the set position. By operating the cylinder 53, the distance can be adjusted by the pressing force of the tie rods 19R and 19L.

Another embodiment, which varies from the embodiment of FIGS. 3-6, is shown in FIG.

In FIG. 7, the same parts as those explained in FIG. 5 will be described using the same reference numerals.

In FIG. 7, support plates 39 and 41 are fixed to a portion of each of the upper portion 21 and lower portion 23 of the tie rod 19R by, for example, welding. Between the support plates 39 and 41 on both sides of the tie rod 19R, first links 43R and 43L, second links 45R and 45L and third links 47R and 47L are connected to the support plate 39.
They are connected with pins etc. in order from the sides.

Moreover, the second links 45R and 45L are provided parallel to the upper part 21 and lower part 23 of the tie rod 19R, respectively, and the second link 45R is provided in the space between the upper part 21 and the lower part 23.
Almost the center of 5R and 45L is located.

Furthermore, the second links 45R and 45L include
In FIG. 7, holes 49 and 59 are bored in the left-right direction. The hole 49 is just a through hole, and the hole 5
3 has a female thread carved into it, and the bolt 5 is attached to the female thread.
1 are screwed together.

With the above configuration, when the bolt 51 is rotated clockwise with a jig or the like, the second link 45L
is pulled toward the tie rod 19R, that is, to the right, and the upper portion 21 and lower portion 23 of the tie rod 19R are respectively pressed inward.

Therefore, while applying a predetermined preload to the tie rods 19R and 19L, the detection device 33 explained in FIG. The distance is detected, and the preload on the tie rods 19R and 19L is adjusted based on the detected amount.

Note that the present invention is not limited to the embodiments described above, but can be implemented in other forms by making appropriate changes. For example, it is applicable not only to C-type frame press machines but also to straight side frame press machines.

[Effects of the invention] As can be understood from the description of the embodiments above, the present invention has tie rods 19R and 19L mounted on the upper sides of C-shaped side frames 3R and 3L that support the slide 9 in a vertically movable manner. Upper part 21
is fixedly provided, and the side frame 3 is fixedly provided.
The above tie rods 19R and 19 are installed on the lower side of R and 3L.
A pair of leaf springs 25, 27 or links 45R, 45L whose upper and lower ends are connected to the upper and lower parts 21 and 23, respectively, are moved toward or away from each other. It is equipped with an adjustable external force applying device.

As is clear from the above structure, in the present invention, the tie rods 19R, 19L are divided into an upper portion 21 and a lower portion 23, and the upper portion 21 is divided into an upper portion 21 and a lower portion 23.
1 and the lower portion 23 are connected to the upper and lower ends of a pair of leaf springs 25, 27 or links 45R, 45L. An external force applying device is provided which can adjust the leaf springs 25, 27 or the links 45R, 45L toward or away from each other.
Therefore, according to the present invention, tie rod 19R,1
This means that the tension of 9L can be adjusted. Therefore, the deflection of the side frames 3R, 3L can be adjusted, and, for example, the bottom dead center position of the slide 9 that moves up and down can be always adjusted in advance.

[Brief explanation of the drawing]

FIG. 1 is a front view of a mechanical press according to an embodiment of the present invention, and FIG. 2 is a right side view of FIG. 1. FIG. 3 is an enlarged cross-sectional view of the section shown by the arrow in FIG. 2, and FIG. 4 is an explanatory diagram of the operation of FIG. 3. Fifth
6 and 7 are diagrams showing other embodiments in place of FIG. 3. Explanation of the symbols representing the main parts of the drawing, 1...
Mechanical press, 7... Bolster, 9... Slide, 19R, 19L... Tie rod, 25, 27
...Plate spring, 33...Detection device, 53...Cylinder.

Claims (1)

[Scope of utility model registration request] A tie rod 19 is attached to the upper side of the C-shaped side frames 3R and 3L that support the slide 9 in a vertically movable manner.
The upper portions 21 of the tie rods 19R, 19L are fixedly provided, and the lower portions 23 of the tie rods 19R, 19L are fixedly provided on the lower side of the side frames 3R, 3L.
3 is provided with an external force applying device that can freely adjust a pair of leaf springs 25, 27 or links 45R, 45L whose upper and lower ends are connected to each other in a direction toward or away from each other.