JPH0341280B2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> The present invention relates to a die height adjustment device for a mechanical press, which eliminates the floating gap remaining after die height adjustment and reduces impact noise caused by breakthrough during press punching. This is a technology that suppresses the occurrence.

<<Basic structure as a premise>> The basic structure of the die height adjustment device is as follows.

For example, as shown in FIGS. 1 and 2 or 5, the slide 4 of the mechanical press 1 is interlocked and connected to the prime mover 9 via the slide drive mechanism 8, and the slide 4 of the mechanical press 1 is slid from the frame 2 via the slide drive mechanism 8. A die height adjusting telescopic device 18 is interposed in a portion up to the output end 17 of the die height adjusting device 18, and the die height adjusting device 18 is adjusted and driven by a telescopic adjustment operating device 19 to adjust the die height h. This is what I did.

In this basic structure, as is well known, the slide 4 passes from the frame 2 through the slide drive mechanism 8.
There is a space for movement at each joint up to , and the total accumulation of these spaces is formed.

In punching work using a mechanical press, when the punch punches out a processed plate, the reaction force causes the frame 2 to
is elastically deformed, and immediately after punching, the slide 4 is suddenly punched out by breakthrough through the slide drive mechanism 8 due to the repulsive force of the frame 2, causing a collision at each part forming the above-mentioned accumulation space. , causing impact noise, wear and deformation.

In recent years, the speed and capacity of mechanical presses have rapidly increased, and the above-mentioned noise problem has become more serious. Therefore, it is required to suppress the noise as much as possible.

<<Prior Art>> In the basic structure described above, the structure of the die height adjusting expansion/contraction device 18 has conventionally been as shown in FIGS. 5 and 6.

That is, a height adjustment screw part 80 is interposed in the middle of the connecting rod 24 of the slide drive mechanism 8, and the male screw 82 of the small end part 26 of the slide 4 side can be freely adjusted forward and backward by the female thread 81 of the large end part 25 of the frame 2 side. They are fitted together.

This conventional structure works as follows.

When adjusting the die height, the telescopic adjustment operation device 19
By rotating the small end 26 side via the gear transmission mechanism 83 with the height adjusting electric motor 41 that constitutes the , and move the slide 4 forward and backward in the height direction to adjust the die height h.

On the other hand, during press work, the press force is applied to the large end 2.
5 to the slide 4 via the height adjustment screw portion 80 and the small end portion 26, and the die set 11 punches the work plate 15.

<<Problems to be Solved by the Invention>> The above-mentioned conventional technology is excellent in that the die height h can be easily adjusted. However, the following problems remained.

B. The mechanical press is noisy.

In order to smoothly rotate the small end portion 26 with the height adjusting electric motor 41, it is necessary to form a threaded engagement gap e between the female thread 81 and the male thread 82, as shown in FIG. Since the height adjusting screw part 80 needs to have a large diameter in order to transmit the pressing force, the screw fitting distance e also increases accordingly.

Moreover, whereas the die height adjustment is performed when the mechanical press 1 is cold before operation, it is sufficiently warmed and expanded during steady operation of punching, so that the screw fitting interval e becomes even larger.

This large screw fitting distance e increases the above-mentioned integration distance of the slide drive mechanism 8, so impact noise, wear, and deformation due to breakthrough are large.

(b) A large-sized height adjustment motor is required.

Since the height threaded portion 80 needs to have a large diameter for transmitting the press force, the frictional resistance during driving is large and the transmission efficiency is low. For this reason, a large-sized height adjustment motor 41 is required, and energy loss is large.

Furthermore, when mounting the die set 11 on the mechanical press 1, a preload is applied by the height adjustment electric motor 41, but in this case as well, since the transmission efficiency of the height adjustment screw portion 80 is low, the height adjustment A larger electric motor 41 is required, and energy loss also increases.

The present invention provides a flexible device for adjusting the die height.
The purpose of this invention is to prevent gaps from occurring, eliminate impact noise, abrasion, and deformation, and to enable a compact expansion/contraction adjustment device.

<<Means for Solving the Problems>> In order to achieve the above object, the present invention adds the following improvements to the above basic structure.

That is, for example, as shown in FIGS. 1 and 2,
The above-described telescopic device 18 for adjusting die height is composed of a telescopic mechanism 30 consisting of a cylinder portion 20 and a piston 23 fitted therein, and a clamp 31 disposed between the cylinder portion 20 and the piston 23, Height adjustment screw 36 on the cylinder part 20
The height adjusting screw 36 is screw-fitted to the piston 23, and the telescopic adjustment operating device 19 is driven by a telescopic mechanism that rotationally drives either the height adjusting screw 36 or the piston 23. Consisting of means 33 and clamp driving means 34,
The telescopic mechanism 30 is configured to be able to expand and contract by the rotational drive of the telescopic mechanism driving means 33 to adjust the die height h, and the clamp 31 is configured to be clamp-driven by the clamp driving means 34, In this clamped state, the cylinder portion 20 is fixed to the piston 23 so as not to be allowed to move in the direction of expansion and contraction, and the die height h is maintained at the adjusted dimension.

≪Effect≫ The invention works as follows.

When adjusting the die height, first operate the clamp drive means 34 to release the clamp 31,
The cylinder part 20 is made vertically movable relative to the piston 23 of the telescopic mechanism 30. Next, the telescoping mechanism driving means 33 rotates either the piston 23 or the height adjustment screw 36 to move the cylinder 20 up and down to extend or retract the telescoping mechanism 30.
Move slide 4 forward and backward in the height direction to set the die height h.
Adjust.

Then, the clamp driving means 34 is operated to operate the clamp 31 to the clamped state, and the telescopic mechanism 3
The piston 23 of No. 0 and the cylinder portion 20 are fixed with a clamp 31.

As a result, after adjusting the die height, the expansion mechanism 3
There is no free movement between the frame side member A and the slide output end side member B, and the accumulation distance of the slide drive mechanism 8 is reduced. This results in
Significantly suppresses impact noise, wear, and deformation caused by breakthrough during punching.

≪Example≫ Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIGS. 1 and 2 show a first embodiment, in which FIG. 1 is an enlarged sectional view of the main part of FIG. 2, and FIG. 2 is a side view of a mechanical press.

In Figure 2, 1 is a crank press (mechanical press)
This has a C-shaped frame 2. A slide 4 is attached to a frame 2 via a slide guide 5 to a bed 3 provided on the front side of the clamp press 1.
It is supported so that it can move up and down. Further, a bolster 6 is fixed to the bed 3.

The slide 4 is interlocked and connected to a main motor 9 via a slide drive mechanism 8, and is driven in the vertical direction. 11 is a die set for punching, which is
A lower mold 12 and an upper mold 13 are vertically movable via guide posts 14. The lower mold 12 is fixed to the bolster 6, and the upper mold 13 is mounted on the slide 4.
is fixed to the adapter plate (output end) 17 of. 15 is a processed plate.

Then, the die height h is adjusted according to the height dimension of the die set 11. That is, in the part between the frame 2, the slide drive mechanism 8, and the adapter plate 17 of the slide 4,
As shown in FIG. 1, a die-height adjusting telescopic device 18 is interposed, and the die-height adjusting telescopic device 18 can be driven and stopped in the telescopic direction by a telescopic adjustment operation device 19.

First, the slide drive mechanism 8 will be explained. A crankshaft 21 is supported on the upper part of the frame 2, and a crank 22 is provided at the front part of the crankshaft 21, while a piston 23 is vertically slidable in a cylinder part 20 formed by opening a fitting hole 4a in the upper part of the slide 4. mated to. A connecting rod 24 is provided between the crank 22 and the piston 23. The connecting rod 24 has a large end 25 connected to the crank 22 and a small end 26 connected to the upper part of the piston 23 via a ball joint 27. The large end portion 25 and the small end portion 26 are removably fixed to each other by a threaded joint portion 28 .

Next, the die height adjustment telescopic device 18 and the telescopic adjustment operation device 19 will be explained. The telescopic adjustment operating device 19
It is composed of a telescopic mechanism driving means 33 for rotationally driving the piston 23 and a clamp driving means 34. The telescoping mechanism 30 is configured to be able to be driven for telescoping adjustment by a telescoping mechanism driving means 33, and the clamp 3
1 is configured such that it can be driven by a clamp driving means 34.

The telescopic mechanism 30 has a height screw 36 fitted into the lower part of the piston 23 so as to be freely adjustable forward and backward. The lower part of the height adjusting screw 36 is supported in a non-rotating manner by the lower part of the cylinder portion via the linear guide 37, and is pressed upwardly by the compression spring 38. 39 is a spring holder. When the piston 23 is rotated around the axis of the connecting rod 24 by the telescopic mechanism driving means 33 via the ball joint 27, the height adjusting screw 36 screwed into the piston 23 moves up and down. The cylinder portion 20 is moved up and down via a height adjustment screw, so that the slide 4 can be raised and lowered.

The rotation of the piston 23 is controlled by the telescopic mechanism driving means 3.
This is done by the height adjustment electric motor 41 of No. 3. That is, the drive gear 4 is connected to the output shaft of the height adjustment electric motor 41.
2 is fixedly installed, while a driven gear 43 is engaged with the upper outer peripheral surface of the piston 23 via a linear guide 44 so as to be relatively movable in the vertical direction. Driven gear 43
is rotatably supported on the upper part of the slide 4 and meshed with the drive gear 42. When the height adjusting electric motor 41 is driven, the piston 23 is rotated via the driving gear 42 and the driven gear 43. As a result, the height adjusting screw 36 can be raised and lowered as described above, and in conjunction with this, the slide 4 is raised and lowered relative to the slide guide 5 via the linear guide 44.

Further, the clamp 31 has a clamp outer cylinder 46 fixedly installed in the middle of the cylinder 20 in the vertical direction. The inner peripheral surface of the clamp outer cylinder 46 and the piston 23
A friction contact cylinder 47 is provided between the outer peripheral surface of the cylinder and the outer peripheral surface of the cylinder.
The friction contact cylinder 47 has both upper and lower ends connected to the clamp outer cylinder 4.
6 in an oil-tight manner.
6. A hydraulic oil chamber 48 is formed between the friction contact tubes 47. The inner circumferential surface of the friction contact tube 47 is brought into contact with the outer circumferential surface of the piston 23 in a vertically slidable manner.

When pressurized oil is injected into the hydraulic oil chamber 48 from the booster pump 50 of the clamp driving means 34 through the oil supply pipe 51, the friction contact tube 47 is pressed against the outer peripheral surface of the piston 23, forming the frame side member A. The piston 23 and the cylinder portion 20 constituting the slide output end member B are frictionally fixed with a predetermined clamping force. Even if a press reaction force acts on the slide 4 during press working, the cylinder portion 20 formed on the slide 4 is firmly frictionally fixed to the piston 23 by the frictional fixing force, so that the press force is reliably applied to the slide 4. is transmitted to.

Note that an overload safety device may be configured using the above-mentioned clamp 31. In this case, clamp 3
The clamping force of 1 is set to a value approximately equal to the full load of the crank press 1. If an overload is applied to the slide 4 during press working, the frictional fixing force cannot withstand it, and a slip occurs between the friction contact tube 47 and the piston 23, preventing the slide 4 from descending due to the overload. This also allows lowering of the cooking rod 24. This provides overload safety operation.

Further, in this embodiment, the mechanical press is described as the crank press 1, but this may also be a knuckle press. Further, the die height adjusting telescoping device 18 may be provided in a portion between the frame 2, the slide drive mechanism 8, and the output end 17 of the slide 4, and may be provided in the connecting rod 24, for example. .

FIGS. 3 and 4 show other embodiments, and FIGS.
A configuration different from the embodiment will be explained.

(Second Embodiment) FIG. 3 shows a second embodiment. In this embodiment, the piston 23 is prevented from rotating with respect to the connecting rod 24 by a rotation prevention pin 60. Further, the height adjustment screw 36 is formed in a cylindrical shape, and a female threaded hole thereof is screw-fitted into the lower part of the piston 23. A driven gear 43 is provided above the height adjusting screw 36, and the upper surface of the driven gear 43 is freely rotatably pressed against the lower surface of a clamp outer cylinder 46 which is fitted and fixed to the cylinder portion 20 via a compression spring 38. A drive shaft 61 is suspended from the height adjustment electric motor 41, and a drive gear 42 is attached to the lower end of the drive shaft 61.
is fixed. This meshes with the driven gear 43.

When adjusting the die height, when the height adjustment electric motor 41 is driven, the height adjustment screw 36 can be raised and lowered via the drive gear 42 and the driven gear 43, thereby causing the cylinder portion 20 to move up and down and slide. 4 goes up and down.

In addition, 62 is a die height display means, which is
Transmission gear mechanism 6 driven by driven gear 43
3 and a die height counter 64. Further, 65 is a limit switch, which detects the above-mentioned overload safety operation.

(Third Embodiment) FIG. 4 shows a third embodiment. In this embodiment, the upper part of the piston 23 is supported by the frame 2 via a piston guide 68 so as to be vertically slidable. Within the piston guide 68, a worm gear 69 is fitted onto the outer peripheral surface of the piston 23 via a linear guide 44 so as to be vertically movable. This worm gear 69
is driven by a height adjusting electric motor 41 fixed to the piston guide 68. In this way, the height adjusting motor 41 is not subjected to impact during press working, and is therefore less likely to be damaged.

<<Effects of the Invention>> The present invention has the following effects because it is configured and operates as described above.

After adjusting the die height, the piston and cylinder parts of the telescoping mechanism, that is, the frame side member and the slide output end side member, are fixed with clamps to eliminate any free movement between them, allowing the integration of the slide drive mechanism. 〓 Space can be reduced. This makes it possible to significantly suppress impact noise, wear, and deformation that occur during punching.

(b) The telescopic mechanism only performs telescopic operation by moving the cylinder portion up and down relative to the piston, and does not transmit pressing force, so frictional resistance is small and transmission efficiency is high. For this reason, the telescoping mechanism drive means is small and
It can be made to have a small capacity, and its energy consumption is also small. Furthermore, when a die set is installed in a mechanical press, a preload is applied to the die set using a telescoping mechanism driving means, but even in this case, since the telescoping mechanism has high transmission efficiency, the telescoping mechanism driving means can be made smaller.・It can be made with small capacity and consumes less energy.

[Brief explanation of the drawing]

1 to 4 show embodiments of the present invention, and FIGS. 1 and 2 are examples of the present invention. FIG. 1 is an enlarged vertical cross-sectional view of the main part of FIG. The side view of the press, FIGS. 3 and 4, are views corresponding to FIG. 1 showing other embodiments, and FIGS. 5 and 6 show the conventional example, and FIG. FIG. 6 is a longitudinal sectional view of the height adjustment screw. 1...Crank press (mechanical press), 2...
Frame, 4... Slide, 8... Slide drive mechanism, 9... Main motor (prime mover), 17... Adapter plate (output end), 18... Telescopic device for die height adjustment, 19... Telescopic adjustment operating device ,
20...Cylinder part, 23...Piston, 30
... Telescopic mechanism, 31 ... Clamp, 33 ... Telescopic mechanism driving means, 34 ... Clamp driving means, 36
...Driving oil chamber, h...Die height.

Claims (1)

[Scope of Claims] 1. A die height adjustment telescopic device 18 is interposed between the frame 2 of the mechanical press 1, the slide drive mechanism 8, and the output end 17 of the slide 4. In the die height adjusting device for a mechanical press, the die height h can be adjusted by adjusting and driving the die height h using a telescopic adjustment operating device 19. A clamp 31 is disposed between the cylinder portion 20 and the piston 23, and a height adjustment screw 36 is supported on the cylinder portion 20, and the height adjustment screw 36 is connected to the piston. 23, and the telescopic adjustment operating device 19 is composed of a telescopic mechanism driving means 33 that rotationally drives either the height adjusting screw 36 or the piston 23, and a clamp driving means 34, The telescopic mechanism 30 is expanded and contracted by the rotational drive of the telescopic mechanism driving means 33 to adjust the die height h.
The clamp 31 is configured to be adjustable, and the clamp 31 has a clamp driving means 34.
In addition, in this clamped state, the cylinder portion 20 is fixed to the piston 23 in such a manner that it does not allow free movement in the direction of expansion and contraction, and the die height h is maintained at the adjusted dimension. Die height adjustment device for mechanical presses. 2. The piston 23 of the telescopic mechanism 30, which is interposed in the lower transmission portion of the slide drive mechanism 8, is fitted into the cylinder portion 20 formed on the slide 4 so as to be vertically slidable, and the piston 23 is fixed to the cylinder portion 20. The clamping force of the clamp 31 is applied to the mechanical press 1.
When the slide 4 is overloaded, the piston 23 slides downward against the cylinder portion 20 against the clamping force of the clamp 31, resulting in overload safety operation. A die height adjusting device for a mechanical press according to claim 1, which is configured to do so.