JPH0341279B2 - - 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 4, 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 is connected from the frame 2 via the slide drive mechanism 8. A telescopic device 18 for adjusting die height is interposed in the portion up to the output end 17 of No. 4, and the telescopic device 18 for adjusting die height is adjusted and driven by a telescopic adjustment operating device 19, so that the die height h can be adjusted. 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 above-mentioned basic structure, the structure of the die height adjusting expansion/contraction device 18 has conventionally been as shown in FIGS. 4 and 5.

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 adjusting 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 problem remained.

B. The mechanical press is noisy.

In order to smoothly rotate the small end portion 26 with the height adjustment 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 adjusting screw part 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
Large energy loss.

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.

It takes time to adjust the die height.

As described above, the height adjustment screw portion 80 has a large frictional resistance when driven, so the speed of height adjustment is inevitably slow. Therefore, it takes time to adjust the die height.

D. Since the telescopic adjustment operating device 19 requires a height adjustment electric motor 41 and a gear transmission mechanism 83, its structure is complicated and it is easily damaged by impact during press operation.

The present invention provides a flexible device for adjusting the die height.
To prevent gaps from occurring, thereby eliminating impact noise, wear and deformation; to enable a compact expansion/contraction adjustment device; to enable die height adjustment in a short time; and to perform expansion/contraction adjustment operation. It is an object of the present invention to simplify the structure of a device and increase its durability.

<<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 die height adjustment telescopic device 18 is composed of a hydraulically operated telescopic mechanism 30 consisting of a cylinder 20 and a piston 23, and a hydraulic clamp 31 disposed between the cylinder 20 and the piston 23. The adjustment operating device 19 is connected to a pressure oil supply/discharge means 33 for driving the telescoping mechanism, which communicates with a drive oil chamber 36 between the cylinder 20 and the piston 23, and a clamp drive means 33, which communicates with a clamp hydraulic oil chamber 48 of the hydraulic clamp 31. The hydraulically operated telescoping mechanism 30 is telescopically driven by supplying and discharging pressurized oil from the telescoping mechanism driving pressure oil supplying and discharging means 33 to the drive oil chamber 36. The die height h is configured to be adjustable, and the hydraulic clamp 31 is configured to be clamp-driven by supplying and discharging pressure oil from the clamp operating oil chamber 48 by the clamp driving pressure oil supply and discharge means 34. In addition, in this clamp state,
The cylinder 20 is fixed to the piston 23 so as not to be allowed to move freely 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, the clamp drive pressure oil supply and discharge means 34 supplies and discharges pressure oil from the clamp hydraulic oil chamber 48 to release the clamped state of the hydraulic clamp 31, and then the piston 23 of the hydraulically operated telescoping mechanism 30
The cylinder 20 can be moved up and down relative to the cylinder 20. Next, the telescopic mechanism driving pressurized oil supply/discharge means 33 moves the cylinder 20 up and down relative to the piston 23 to drive the hydraulically operated telescopic mechanism 30 to extend and contract, and moves the slide 4 forward and backward in the height direction to adjust the die height h. do.

Then, by supplying and discharging pressure oil from the clamp hydraulic oil chamber 48 with the clamp drive pressure oil supply and discharge means 34, the hydraulic clamp 31 is operated in a clamped state, and the piston 23 and cylinder of the hydraulically operated telescoping mechanism 30 are 20 are fixed with a hydraulic clamp 31.

As a result, after adjusting the die height, there is no free movement between the frame side member A and the slide output end side member B in the hydraulically operated telescoping mechanism 30, and the accumulation distance of the slide drive mechanism 8 is reduced. . This greatly reduces 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.

1 and 2 show a first embodiment, FIG. 1 is an enlarged sectional view of the main part of FIG. 2, and FIG. 2 is a side view of the mechanical press.

In Figure 2, 1 is a crank press (mechanical press)
This has a C-shaped frame 2. A slide 4 is inserted into the frame 2 through a slide guide 5 to a bed 3 provided on the front side of the crank 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. Reference numeral 11 denotes a die set for punching, in which a lower die 12 and an upper die 13 are vertically movable via guide posts 14. A lower mold 12 is fixed to the bolster 6, and an upper mold 13 is fixed to an adapter plate (output end) 17 of the slide 4. 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 adjustment telescopic device 18 is interposed, and the die height adjustment device 18 is adjusted and driven by a telescopic adjustment operating device 19, so that the die height h can be adjusted.

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. On the other hand, a cylinder 20 is fixedly installed within the slide 4, and a piston 23 is fitted into the cylinder 20 so as to be vertically slidable. A connecting rod 24 is provided between the crank 22 and the piston 23. Stove rod 2
4, its large end 25 is connected to the crank 22, and its small end 26 is connected to the piston 2 via a ball joint 27.
It is connected to the upper part of 3. 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 is comprised of a pressure oil supply/discharge means 33 for driving the telescopic mechanism and a pressure oil supply/discharge means 34 for driving the clamp. The hydraulically operated telescoping mechanism 30 is configured to be able to be driven for telescoping adjustment by a pressure oil supply/discharge means 33 for driving the telescoping mechanism, and the hydraulic clamp 31 is configured to be clamp driven by a pressure oil supply/discharge means 34 for driving the clamp. has been done.

The hydraulically operated telescoping mechanism 30 includes a cylinder 20
It has a driving oil chamber 36 formed between the outer circumferential surface of the upper half of the piston 23 and the outer circumferential surface of the piston 23, and communicates with the pressurized oil supply/discharge means 33 for telescopic driving. On the other hand, a spring chamber 37 is formed below the piston 23, and a return spring 38 is attached to this spring chamber 37. Further, the spring chamber 37 has an air spring function using compressed air supplied from an air pressure source 39. Then, when pressure oil is supplied to the drive oil chamber 36 from the telescopic mechanism drive pressure oil supply/discharge means 33, the slide 4 on which the cylinder 20 is fixed is raised against the elastic force of the return spring 38 and the air spring. . On the other hand, when the pressure oil is discharged from the drive oil chamber 36, the elastic force of the return spring 38 and the air spring causes the cylinder 2 to move around the piston 23.
0 slides down and the slide 4 is lowered.

Furthermore, pressure oil is supplied to and discharged from the drive oil chamber 36 by a pressure oil supply and discharge means 33 for driving the telescopic mechanism. This is the on-off valve 33a connected in series.
It has a supply/discharge valve 33b and a speed switching valve 33c, and these valves are connected to a hydraulic power source 43 via a supply/discharge pipe 42. Pressure oil is supplied to and discharged from the driving oil chamber 36 by opening and closing the supply/discharge valve 33b. Furthermore, by switching the speed switching valve 33c, the amount of pressure oil supplied and discharged can be switched.
The vertical movement speed of the slide 4, in other words, the die height adjustment speed can be varied.

Further, the hydraulic clamp 31 is configured as follows. That is, in the lower half of the cylinder 20, a friction contact tube 47 is provided between the inner circumferential surface of the cylinder 20 and the outer circumferential surface of the piston 23. Both upper and lower ends of the friction contact cylinder 47 are fitted and fixed to the cylinder 20 in an oil-tight manner, and a clamp hydraulic oil chamber 48 is formed between the cylinder 20 and the friction contact cylinder 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.

The pressure oil supply/discharge means 34 for driving the clamp has a supply/discharge valve unit 44, which has the above-mentioned valves 33a to 33a.
It is composed of a valve similar to 33c.

When pressurized oil is injected into the clamp hydraulic oil chamber 48 via the supply/discharge valve unit 44, the friction contact cylinder 4
7 is pressed against the outer peripheral surface of the piston 23, and the piston 23 constituting the frame side member A and the cylinder 20 constituting the slide output end side member B are frictionally fixed with a predetermined clamping force. Even if the press reaction force acts on the slide 4 during press processing,
Since the cylinder 20 fixed to the slide 4 is firmly frictionally fixed to the piston 23 by the frictional fixing force, the press force is reliably transmitted to the slide 4.

Further, 52 is a die height display means, which is
It consists of a die height counter 53 and a transmission rod 54. A die height counter 53 is attached to the slide 4, and a transmission rod 54 is connected to the top of the piston 23. When the slide 4 with the cylinder 20 fixed to the piston 23 moves up and down, the die height counter 53 is driven by a transmission gear mechanism 55 consisting of a rack 55a and a pinion 55b.

Further, an overload safety device is constructed using the hydraulically operated clamp 31 described above. In this case, the clamping force of the hydraulically operated clamp 31 is set to a value approximately equal to the total 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.

In addition, with the installation of an overload safety device,
The die height display means 52 is constructed as follows. That is, the cylinder 58 is fixed to the slide 4 below the die height counter 53. On the other hand, an operating rod 59 is provided protruding downward from the transmission rod 54,
This is inserted into the cylinder 58 so as to be vertically movable. Between the cylinder 58 and the actuating rod 59,
A hydraulic clamp 31 and a contact tube 60 having substantially the same structure as the friction contact tube 47 are attached. 61 is a hydraulic oil chamber, and this hydraulic oil chamber 61 and the clamp hydraulic oil chamber 4
8 are connected by a hydraulic hose 62.

Further, from the upper surface side of the piston 23, the connecting shaft 63
is installed protrudingly. A transmission rod 54 is fitted to the connecting shaft 63 so as to be movable up and down, and a connecting spring 64
In addition, a limit switch 65 is attached to the upper side of the operating rod 54, and its contact 65a is brought into contact with the upper surface of the connecting shaft 63.

When adjusting the die height, the supply/discharge valve unit 44
When the pressure in the hydraulic oil chamber 61 is lowered through the hydraulic fluid chamber 61, vertical movement of the operating rod 59 with respect to the friction contact tube 60 is permitted. Then, when the slide 4 expands and contracts, the transmission rod 54 moves up and down along with this, and the die height counter 53 is driven via the transmission gear mechanism 55. On the other hand, during press work, the hydraulic oil chamber 6
Pressure oil is pressurized into the cylinder 1, and the friction contact cylinder 60 is pressed against the circumferential surface of the actuating rod 59. As a result, the transmission rod 54 is frictionally fixed to the cylinder 58 with a predetermined force.

When the overload safety operation is performed during press working and the piston 23 is lowered relative to the slide 4, the transmission rod 54 is fixed to the slide 4 via the friction contact tube 60 and the cylinder 58, while the piston 23 With the lowering of the connecting shaft 63, only the connecting shaft 63 descends while pressing the connecting spring 64, and the limit switch 65 is actuated. In this way, the transmission rod 54 does not move together with the piston 23 during overload safety operation, so the die height counter 53
No shock is applied to the

In this embodiment, the mechanical press is described as a 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; for example, it may be provided in the connecting rod 24. good.

Also, when the mechanical press 1 is operated for a long time,
The ball joint 27 interposed between the piston 23 and the connecting rod 24 wears out and the fitting distance increases, but when adjusting the die height, the elastic force of the return spring 38 in the spring chamber 37 and the air spring Since the piston 23 and the lower surface of the connecting rod 24 are automatically brought into contact, no rattling occurs between them. Therefore, even if the ball joint 27 wears out, there is no need to insert a shim for adjusting the distance into the slide 4, and there is no need to disassemble and reassemble the slide 4.

Furthermore, the spring installed in the spring chamber 37 is
Either one of the return spring 38 and the air spring may be used. Further, when the die height 4 is not equipped with the above-mentioned overload safety device, pressure oil may be supplied to and discharged from the spring chamber 37 instead of the air spring.

FIG. 3 shows another embodiment, and a different configuration from the above embodiment will be explained.

In this embodiment, the die height display means 52 is configured as follows. A support tube 68 is fixed to the slide 4 below the die height counter 53, and the cylinder 58 is inserted into the upper half thereof so as to be vertically movable. Inside the cylinder 58, as in the previous embodiment,
An actuating rod 59 and a friction contact cylinder 60 are inserted. The cylinder 58 is pressed upward by a cylinder return spring 69. On the other hand, a press shaft 70 is inserted into the lower part of the cylinder 58 so as to be vertically movable, and is pressed downward by a press spring 71 to come into contact with the contact 65a of the limit switch 65.

When the piston 23 descends relative to the slide 4 during overload safety operation, and the transmission rod 54 descends along with this, the cylinder 58 is moved by the cylinder return spring 69 via the operating rod 59 and the friction contact cylinder 60. The pressing shaft 70 operates the limit switch 65.

<<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 of the hydraulically operated telescoping mechanism, that is, the frame side member and the slide output end side member, are fixed with a hydraulic clamp to eliminate any free movement between them, so that the slide can be driven. Mechanisms can be integrated into smaller spaces. This makes it possible to significantly suppress impact noise, wear, and deformation that occur during punching.

(b) The hydraulically operated telescoping mechanism only needs to be telescopically operated by moving the cylinder up and down relative to the piston, so the resistance during telescoping drive is small, the transmission efficiency is high, and the driving force is small. Therefore, the cross-sectional area of the drive oil chamber for driving only needs to be small, and the amount of pressure oil supplied and discharged can be small.

Therefore, the pressure oil supply/discharge means for driving the clamp can be made small and have a small capacity, and since the transmission efficiency of the hydraulically operated telescoping mechanism is high, energy consumption is also low. Furthermore, when a die set is installed in a mechanical press, a preload is applied to the die set using a pressure oil supply/discharge means for driving the telescoping mechanism, but even in this case, the hydraulically operated telescoping mechanism described above has low transmission efficiency. Because it's expensive,
The pressure oil supply/discharge means for driving the telescoping mechanism can be made small and of low capacity, and energy consumption can be reduced.

C. As described above, since the driving cross-sectional area of the driving oil chamber is small, the driving speed of the driven member becomes faster than the amount of pressure oil supplied and discharged, and the die height adjustment can be completed in a short time.

D. The pressure oil supply and discharge means for driving the telescoping mechanism of the telescoping adjustment operating device requires only a valve (or booster pump) and oil supply and drainage piping, so compared to the height adjustment electric motor 41 and gear transmission mechanism 83 of the conventional example, The structure becomes simple.

Further, since the pressure oil supply/discharge means for driving the telescoping mechanism can have a simple structure as described above, it is less likely to be damaged even if it receives impact during press operation. Therefore, the durability of the telescopic adjustment operating device is improved.

[Brief explanation of drawings]

1 to 3 show embodiments of the present invention, and FIGS. 1 and 2 are one embodiment of the present invention. FIG. 1 is an enlarged cross-sectional view of the main part of FIG. A side view of the mechanical press, Fig. 3 is a partial view showing another embodiment, and Fig. 4 is a partial view showing another embodiment.
5 and 5 show a conventional example, with FIG. 4 being a sectional view of the main part, and FIG. 5 being a longitudinal sectional view of the height adjusting 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, 23...Piston, 30...
Hydraulic-operated telescoping mechanism, 31...hydraulic clamp,
33... Pressure oil supply/discharge means for driving the telescopic mechanism, 34...
Pressure oil supply/discharge means for driving the clamp, 36...driving oil chamber, 48...clamp operating 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 mechanical press die height adjustment device configured to be able to adjust the die height h by adjusting and driving with a telescopic adjustment operating device 19, the die height adjustment telescopic device 18 is replaced by a hydraulically operated telescopic mechanism 30 consisting of a cylinder 20 and a piston 23. and a hydraulic clamp 31 disposed between the cylinder 20 and the piston 23.
A pressure oil supply/discharge means 33 for driving the telescopic mechanism communicates with the drive oil chamber 36 between the piston 23 and a pressure oil supply/discharge means 34 for driving the clamp that communicates with the clamp hydraulic oil chamber 48 of the hydraulic clamp 31. The hydraulically operated telescoping mechanism 30 is driven to expand and contract by supplying and discharging pressure oil from the telescoping mechanism drive pressure oil supply and discharge means 33 to the drive oil chamber 36 to adjust the die height h. The hydraulic clamp 31 is configured to be clamp-driven by supplying and discharging pressurized oil from the clamp hydraulic oil chamber 48 by the clamp driving pressurized oil supplying and discharging means 34, and in this clamped state, A die height adjusting device for a mechanical press, characterized in that the cylinder 20 is fixed to the piston 23 so as not to be allowed to move freely in the direction of expansion and contraction, and the die height h is maintained at the adjusted dimension. 2 Piston 23 of the hydraulically operated telescoping mechanism 30 interposed in the lower transmission portion of the slide drive mechanism 8
is fitted into the cylinder 20 formed on the slide 4 so as to be vertically slidable, and the clamping force of the hydraulic clamp 31 that fixes the piston 23 to the cylinder 20 is applied to the mechanical press 1.
When the slide 4 is overloaded, the piston 23 slides downward against the cylinder 20 against the clamping force of the hydraulic clamp 31 to ensure overload safety. A die height adjusting device for a mechanical press according to claim 1, which is configured to operate.