JPH11320199A - Mechanical press and operation of mechanical press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mechanical press equipped with a flywheel for securing the work volume at the time of low speed operation at the same level as that at the time of high speed operation. SOLUTION: This mechanical press has a high speed operation mode for operating a slide at high speed by a main motor composed of a variable motor, and a low speed operation mode for operating slide at a low speed. This press also comprises a main flywheel 20a which is installed between a slide driving means for driving the slide up/downwards and a main motor 31 and is rotary driven by the main motor 31, a sub flywheel 20b which is rotatably installed adjacent to the main flywheel 20a, and a coupling means 22 which separates the main flywheel 20a and the sub flywheel 20b in a high speed operation, and couples both wheels in a low speed operation. In this case, since the sub flywheel 20b is added to the main flywheel 20a in the low speed operation, the same extent of the work volume as the high speed operation can be obtained even at the time of the low speed operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical press capable of high-speed operation and low-speed operation, and more particularly to a mechanical press capable of securing the same amount of work at low-speed operation as at high-speed operation, and a method of operating the same.

[0002]

2. Description of the Related Art Many mechanical presses used for forging and the like conventionally have a flywheel rotated by a main motor, and the energy stored in the flywheel is released at the time of press working to perform press work. The required work amount is secured, and the mechanical press used for hot forging, etc., presses the work heated to high temperature, so considering the life of the mold, etc.
Usually, the dimensions and weight of the flywheel are determined so that the work required for the press work can be secured during high-speed operation.

[0003] On the other hand, in press working such as forging, there is a case where working is performed at a low speed depending on the type of a work. For this reason, some conventional mechanical presses are capable of high speed operation and low speed operation. In such a mechanical press, a flywheel that can store energy equivalent to the square of the speed ratio of the flywheel inertia moment during high-speed operation is required to secure the work amount during low-speed operation.

[0004]

However, in order to obtain a flywheel capable of accumulating the energy required for securing the work amount at the time of low-speed operation, it is necessary to increase the diameter and width of the flywheel. Increasing the diameter of the wheel interferes with peripheral devices such as a brake device, so that there is a limit to the diameter that can be increased.

If the diameter of the flywheel cannot be increased, it is necessary to increase the width to increase the mass. However, in this method, the weight of the flywheel increases, and a large load is applied to the drive shaft. Is damaged, and the life of the bearing for supporting the drive shaft is shortened at an early stage, thereby causing problems such as requiring much labor and cost for maintenance.

On the other hand, when high-speed operation is performed by a flywheel that can secure the energy required for securing the amount of work during low-speed operation, energy exceeding the energy required for the amount of work during high-speed operation is accumulated in the flywheel. Therefore, a problem such as wasteful consumption of energy occurs.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem. A machine capable of securing the same amount of work even at a low speed operation as at a high speed operation and not consuming wasteful energy at a high speed operation. It is an object of the present invention to provide a press and an operation method thereof.

[0008]

In order to achieve the above object, the invention according to claim 1 comprises a high-speed operation mode in which a slide is operated at a high speed by a main motor comprising a variable speed motor, and an operation in which the slide is operated at a low speed. And a main flywheel provided between the slide drive means for driving the slide up and down and the main motor, and rotatably driven by the main motor, and adjacent to the main flywheel. And a connecting means for separating the main flywheel and the sub-flywheel during high-speed operation and connecting the two during low-speed operation.

With the above configuration, the work required for the press work can be secured by the main flywheel at the time of high-speed operation, so that the press work such as hot forging can be performed efficiently, and the press work can be performed in a short time by the high-speed operation. Because it is completed, the time that the mold is heated by the work is also shorter,
As a result, the life of the mold can be improved.

[0010] In addition, at the time of high-speed operation, it is not necessary to rotate the flywheel larger than necessary, so that energy is not wasted and economical.

On the other hand, at the time of low-speed operation, the work required for the press work can be secured by the main flywheel and the sub-flywheel. Therefore, at the time of low-speed operation, the same work as at the time of high-speed operation can be secured. A wide range of workpieces can be handled by the mechanical press, and the work amount can be secured without increasing the outer diameter of the flywheel. Therefore, there is no possibility that the flywheel will interfere with peripheral devices such as a brake device.

Since it is not necessary to rotate the heavy flywheel at high speed during high-speed operation, the drive shaft is not damaged and the life of the bearing supporting the drive shaft is not shortened at an early stage. The required labor and cost can be greatly reduced.

In order to achieve the above object, the invention according to a second aspect is characterized in that the connecting means is constituted by a connecting rod which is operated by a fluid pressure and is connected to the main flywheel and the sub-flywheel so as to be detachable. is there.

With the above arrangement, the connecting rod is protruded toward the sub-flywheel by the fluid pressure, and the connecting rod is inserted into the connecting hole formed in the end face of the sub-flywheel.
The main flywheel and the sub flywheel can be easily connected, and can be provided at low cost because of the simple configuration.

According to a third aspect of the present invention, the coupling means connects the main flywheel and the sub flywheel by pressing the clutch lining against the end face of the sub flywheel by fluid pressure. This is constituted by clutch means.

According to the above configuration, the clutch fly lining is pressed against the end face of the sub-flywheel by fluid pressure, whereby the main flywheel and the sub-flywheel can be easily connected, and the phases of the main flywheel and the sub-flywheel are shifted. However, since the connection can be performed without performing phase adjustment, the connection between the main flywheel and the sub flywheel can be performed in a short time.

In order to achieve the above object, the invention according to claim 4 is characterized in that the connecting means is constituted by serrations which are engaged and disengaged by fluid pressure.

According to the above configuration, the main flywheel and the sub flywheel can be easily connected by engaging the serrations with the fluid pressure.

According to a fifth aspect of the present invention, a main flywheel is mounted on a drive shaft, and the sub flywheel is supported on a flywheel support member supporting the drive shaft.

With the above configuration, the flywheel support member supports the load of the auxiliary flywheel used during low-speed operation and does not apply to the drive shaft side. Therefore, the drive shaft is damaged by overload, and the drive shaft is supported. The life of the bearing is not shortened at an early stage, thereby greatly reducing the labor and cost required for maintenance.

According to a sixth aspect of the present invention, the main flywheel is mounted on a drive shaft, and the sub flywheel is rotatably supported on the drive shaft side.

With the above configuration, the work of attaching and detaching the main flywheel and the sub flywheel can be easily performed at the time of repair or the like.

According to a seventh aspect of the present invention, there is provided a mechanical press having a high-speed operation mode in which a slide is operated at a high speed by a main motor comprising a variable speed motor and a low-speed operation mode in which the slide is operated at a low speed. In the driving method of (1), a main flywheel, a sub-flywheel, and coupling means for detachably coupling between these flywheels are provided between a slide drive means for vertically driving the slide and the main motor, and a high-speed operation mode is provided. In some cases, the main flywheel is driven to rotate by the main motor, and in the low-speed operation mode, the main flywheel and the sub flywheel are connected by the connecting means, and both flywheels are driven to rotate simultaneously by the main motor. .

According to the above method, the work required for the press work can be secured by the main flywheel at the time of high-speed operation, so that the press work such as hot forging can be performed efficiently, and the press work can be performed in a short time by the high-speed operation. Because it is completed, the time that the mold is heated by the work is also shorter,
As a result, the life of the mold can be improved, and at the time of high-speed operation, there is no need to rotate the flywheel larger than necessary, so that energy is not wasted and economical.

At the time of low-speed operation, the work required for the press work can be secured by the main flywheel and the sub-flywheel. Therefore, at the time of low-speed operation, the same work as at the time of high-speed operation can be secured. A wide variety of workpieces can be handled with this mechanical press.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 is a vertical front view of a mechanical press, FIG. 2 is a vertical side view of the same, FIG. 3 is a cross-sectional view of a flywheel, and FIG.

In these figures, reference numeral 1 denotes a press body, which comprises a bed 1a, uprights 1b erected on both sides of the bed 1a, and a crown 1c suspended between upper ends of the uprights 1b. Accommodates a slide driving means 3 for driving the slide 2 up and down. The slide drive means 3 has a crankshaft 5 rotatably supported via a bearing 4 in a crown 1c. One end of a connecting rod 6 is supported by an eccentric portion 5a of the crankshaft 5. .

The other end of the connecting rod 6 is connected via a pin 8 to an upper part of a slide 2 slidably supported on a slide gib 7 laid on the upright 1b. With the rotation of, the slide 2 is moved up and down via the connecting rod 6. A main gear 11 is connected to one end of the crankshaft 5 via a clutch means 10, a brake means 12 is connected to the other end, and a flywheel support member is provided on the rear surface of the crown 1c. The housing 15 is mounted horizontally on the flywheel support member 13.

The housing 15 is formed in a cylindrical shape as shown in FIG. 3, and a drive shaft 16 is accommodated therein so as to be parallel to the crankshaft 5. The drive shaft 16 is rotatably supported by bearings 17 provided at both ends of a housing 15, and a pinion 18 meshing with the main gear 11 is fixed to one end of the drive shaft 16, and the other end is provided. Is fitted with a flywheel 20. The flywheel 20 includes a main flywheel 20a whose dimensions and weight are determined so as to secure a work amount required for press working at a high speed operation, and a flywheel 20 added to the main flywheel 20a at a low speed operation. The main flywheel 20a is attached to the other end of the drive shaft 16, and has a sub flywheel 20b whose dimensions and weight are determined so as to obtain the work required for the work. The wheel 20b is connected to the housing 15 so as to be adjacent to the main flywheel 20a.
Are rotatably supported via bearings 21 at the ends.

Then, on the main flywheel 20a side,
A connecting means 22 is provided for connecting the main flywheel 20a and the sub flywheel 20b so as to be detachable.
The coupling means 22 is provided at a plurality of locations (or at one location) apart from each other in the circumferential direction of the main flywheel 20a, and has a cylinder 22a in the main flywheel 20a as shown in FIG. I have. A piston 2 movable in a direction parallel to the drive shaft 16 is provided in the cylinder 22a.
2b is accommodated therein, and a connecting rod 22c protrudes from one end face of the piston 22b. The connecting rod 22
The tip of c is protruded from the end face of the main flywheel 20a toward the sub flywheel 20b so as to be freely retractable, and the tip of the connecting rod 22c is fitted into a coupling hole 20c opened in the end face of the sub flywheel 20b. Thus, the main flywheel 20a and the sub flywheel 20b can be integrally connected.

The connecting rod 22c has a piston 22
A biasing means 23 such as a compression spring for biasing the main flywheel 20b toward the pressure chamber 22d is fitted therein, and a detection rod 22e for detecting a coupling state of the main flywheel 20a is provided on the other end surface of the piston 22b. Have been. The detection rod 22e is protruded from the end surface of the cylinder 22a to the outside of the cylinder 22a through a passage 22f for supplying fluid pressure such as air or hydraulic pressure to the pressure chamber 22d.
The coupling detecting means 25 such as a photoelectric switch installed near the main flywheel 20a detects the appearance state of 2e.

On the other hand, a rotary joint 26 is attached to the end face of the main flywheel 20a via a bracket 26c so as to be located at the center of rotation of the main flywheel 20a. 27, and is connected to the passage 22f in the main flywheel 22a through the main flywheel 22a. The fixed portion 26b is connected to a fluid passage (not shown) through a conduit 30 provided with a solenoid valve 28 and a pressure reducing valve 29 on the way. Connected to the source.

An endless belt 35 is wound between a belt groove 20d formed on the outer peripheral surface of the main flywheel 20a and a pulley 32 of a main motor 31 composed of a variable speed motor installed behind the crown 1c. The main flywheel 20a is rotated by the main motor 31, and the flywheel support member 13 near the main flywheel 20a is brought into contact with the outer peripheral surface of the main flywheel 20a, thereby Main flywheel brake means 33 for braking flywheel 20a
However, on the flywheel support member 13 near the sub flywheel 20b, sub flywheel braking means 34 for braking the sub flywheel 20b by being in contact with the end face of the sub flywheel 20b is provided.

Next, the operation of the mechanical press constructed as described above will be described. This mechanical press changes the rotational speed of a main motor 31 composed of a variable speed motor to operate in three modes of high speed operation, low speed operation and fine speed operation. Driving is enabled.

When the high-speed operation mode is selected to operate the machine press at a high speed, the main flywheel brake means 33 is turned off (released), and the sub flywheel brake means 3 is turned off.
4 is turned on (braking), the solenoid valve 28 is in the closed position 28b, and no fluid pressure is supplied to the pressure chamber 22d of the coupling means 222.
Is retracted to the position shown in FIG. In this state, the detection rod 22e protrudes from the end face of the cylinder 22a, and when this is detected by the coupling detection means 25, the control means (not shown) confirms this and rotates the main motor 31 at a high speed. Only the main flywheel 20a is rotated by 31 and the operation in the high-speed operation mode is started.

The size and weight of the main flywheel 20a are set so that the work required for the press work can be secured during high-speed operation, so that hot forging and the like can be performed at high-speed operation. Even if the work heated to about 1100 ° C. is forged, there is little fear that the mold life will be shortened at an early stage due to high heat because of high-speed operation.

On the other hand, when the press work is performed in the low-speed operation mode, the solenoid valve 28 is operated while the main flywheel 20a is braked by the main flywheel brake means 33 and the sub flywheel 20b is braked by the sub flywheel brake means 34. By switching to the open position 28a, the fluid pressure is supplied to the pressure chamber 22d of the coupling means 22. As a result, the piston 22b is advanced toward the auxiliary flywheel 20b against the urging means 23, so that the tip of the connecting rod 22c protruding from the piston 22b is
abuts on the end face of b.

Next, in this state, when the main flywheel brake means 33 is turned off to release the braking of the main flywheel 20a, the main flywheel 20a is rotated at a low speed by the main motor 31 in the low speed operation mode. The tip of the protruding connecting rod 22c fits into the connecting hole 20c of the sub flywheel 20b, the main flywheel 20a and the sub flywheel 20b are connected, and at the same time, the detecting means 25 detects that the detecting rod 22e is immersed. Is detected.

The auxiliary flywheel braking means 34, which is braking the auxiliary flywheel 20b, brakes the auxiliary flywheel 20b with a weak braking force such that the auxiliary flywheel 20b does not rotate with the main flywheel 20a. The connecting rod 22c is fitted into the connecting hole 20c of the sub flywheel 20b, the main flywheel 20a and the sub flywheel 20b are connected, and the main flywheel 20a
Even when the and the sub flywheel 20b rotate integrally, no overload acts on the main motor 31.

On the other hand, according to the signal from the coupling detecting means 25,
When the control means confirms that the main flywheel 20a and the sub flywheel 20b have been connected, the sub flywheel brake means 34 is turned off, and at the same time, the operation mode is switched to the low speed operation mode. 20b is rotated integrally.

The main and sub flywheels 20a, 20b
Since the size and weight of the main and sub flywheels 20a and 20b are set so that the work required for the press work can be secured at the time of low speed operation, the same work as at the time of high speed operation is secured at the time of low speed operation. be able to.

During the low speed operation, the main flywheel 20a
In order to prevent the connection between the motor and the auxiliary flywheel 20b from being released, an interlock is provided so that the solenoid valve 28 is not operated during the low-speed operation.

On the other hand, when the pressing operation in the low-speed operation mode is completed, the main and sub flywheels 20a and 20b are stopped by the main flywheel brake means 33 and the sub flywheel brake means 34, and the solenoid valve 28 is switched to the closed position 28b. Then, since the fluid pressure in the pressure chamber 22b of the connecting means 22 is released, the connecting rod 22c is retracted together with the piston 22b by the urging means 23,
The connection between the main flywheel 20a and the sub flywheel 20b is released.

Each time the high-speed operation mode or the low-speed operation mode is selected, the above operation is repeated. In the high-speed operation mode, only the main flywheel 20a rotates, and in the low-speed operation mode, the main and sub flywheels 20a, 20b.
By rotating at the same time, the amount of work required for the press work can be secured.

In the first embodiment, the connecting means 2
2 is constituted by a connecting rod 22c provided on the main flywheel 20a side so as to be freely retractable, and a connecting hole 20c provided on the sub flywheel 20b side. The second embodiment shown in FIG. 5 and FIG. A clutch lining 36a is provided at the tip of the connecting rod 22c, and the clutch lining 36a is pressed against the end face of the sub flywheel 20b by fluid pressure, thereby connecting the main flywheel 20a and the sub flywheel 20b. The means 36 may be used.

As in the third embodiment shown in FIGS. 7 and 8, a ring 37 having a serration 37a is attached to the tip of the connecting rod 22c, and the serration 37a is engaged with the end face of the sub flywheel 20b. A serration 37b is formed, and these serrations 37a, 3
7b, the main flywheel 20a
And the auxiliary flywheel 20b may be connected.

Further, in the first to third embodiments, the sub-flywheel 20b is mounted on the end of the housing 15 mounted on the flywheel support member 13 side by the bearing 2
1, but a small diameter portion 20d is formed on the side of the main flywheel 20a as shown in the fourth embodiment shown in FIG. The flywheel 20b may be rotatably supported. In this case as well, the connecting means 22 includes a connecting rod 22c, a clutch 36, and a serration 3.
Any of those using 7a and 37b may be used.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of a mechanical press according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional side view of the mechanical press according to the first embodiment of the present invention.

FIG. 3 is a sectional view of a flywheel provided in the mechanical press according to the first embodiment of the present invention.

FIG. 4 is a cross-sectional view showing flywheel connecting means provided in the mechanical press according to the first embodiment of the present invention.

FIG. 5 is a sectional view of a flywheel provided in a mechanical press according to a second embodiment of the present invention.

FIG. 6 is a sectional view showing a flywheel connecting means provided in a mechanical press according to a second embodiment of the present invention.

FIG. 7 is a sectional view of a flywheel provided in a mechanical press according to a third embodiment of the present invention.

FIG. 8 is a cross-sectional view showing flywheel connecting means provided in a mechanical press according to a third embodiment of the present invention.

FIG. 9 is a sectional view of a flywheel provided to a mechanical press according to a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Press main body 2 ... Slide 3 ... Slide drive means 13 ... Flywheel support means 16 ... Drive shaft 20a ... Main flywheel 20b ... Sub flywheel 22 ... Coupling means 22c ... Coupling rod 31 ... Main motor 36 ... Clutch means 36a ... Clutch lining 37a, 37b ... serration

Claims (7)

[Claims] A main motor (3) comprising a variable speed motor.
In a mechanical press having a high-speed operation mode in which the slide (2) operates at a high speed according to 1) and a low-speed operation mode in which the slide (2) operates at a low speed, slide driving means (3) for vertically driving the slide (2) ) And the main motor (31), and a main flywheel (20a) rotatably driven by the main motor (31); and a rotatably provided adjacent to the main flywheel (20a). Sub-flywheel (20b)
And a coupling means (22) for separating the main flywheel (20a) and the sub flywheel (20b) during high-speed operation and connecting the two during low-speed operation. 2. A connecting rod (22) which is operated by fluid pressure to disconnectably connect a main flywheel (20a) and a sub flywheel (20b).
2. The mechanical press according to claim 1, wherein the mechanical press comprises c). 3. The coupling means (22) presses the clutch lining (36a) against the end face of the sub-flywheel (20b) by fluid pressure, thereby connecting the main flywheel (20a) and the sub-flywheel (20b). 2. The mechanical press according to claim 1, wherein the mechanical press comprises a clutch means (36) for coupling the two. 4. The mechanical press according to claim 1, wherein the coupling means (22) is constituted by serrations (37a, 37b) which are engaged and disengaged by fluid pressure. 5. A main flywheel (20a) is mounted on a drive shaft (16), and a sub flywheel (20b) is supported on a flywheel support member (13) supporting the drive shaft (16). The mechanical press according to any one of claims 1 to 4. 6. A flywheel according to claim 1, wherein the main flywheel (20a) is mounted on the drive shaft (16), and the sub flywheel (20b) is rotatably supported on the drive shaft (16) side. 2. The mechanical press according to claim 1. 7. A main motor (3) comprising a variable speed motor.
In the method of operating a mechanical press having a high-speed operation mode in which the slide (2) operates at a high speed according to 1) and a low-speed operation mode in which the slide (2) operates at a low speed, a slide drive for vertically driving the slide (2) Means (3)
And a main flywheel (20a) and a sub flywheel (20b) and a connecting means (22) for detachably connecting the flywheels (20a, 20b) between the main flywheel (20a) and the main flywheel (20b). In the high-speed operation mode, the main flywheel (2) is driven by the main motor (31).
0a) is rotated, and in the low-speed operation mode, the main flywheel (20a) and the sub-flywheel (20b) are connected by the connecting means (22) to form the main motor (31).
Operating both flywheels (20a, 20b) at the same time.