JP3162150B2 - Press drive start position adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving start position adjusting device for a press driven by a crank mechanism.

[0002]

2. Description of the Related Art A press driven by a crank mechanism holds a crankshaft having an eccentric portion rotatably on an airframe, and connects a main motor to the crankshaft via a clutch device and a flywheel, and a brake device. Is provided. The upper end of the connecting rod is fitted on the eccentric part, and the lower end is rotatably connected to the slide.

[0003] Therefore, when the brake device is released and the clutch device is engaged, the crankshaft is rotationally driven by the rotational power from the main motor. That is,
The slide can be moved up and down. On the other hand, by releasing the clutch device and performing the brake operation of the brake device, the rotation of the crankshaft can be stopped. That is, the press can be stopped.

By the way, in such a press, a brake device is operated so as to always stop the crankshaft at a predetermined position for convenience of mold replacement. For this reason, the brake device must be increased in size as the press speed increases. It is to be noted that the predetermined position is generally set to a position where the crank angle is around 0 degree, that is, around the top dead center.

[0005]

However, according to the conventional structure described above, the crankshaft can be fixed to the fixed predetermined position by carefully selecting the brake device while accepting the increase in size and cost. Even if it can be stopped, it is no longer possible to meet the demands for further improvement in product accuracy and production efficiency. In particular, a high-speed press in which the pressing speed exceeds 1000 Spm is becoming a serious problem.

That is, when the pressing speed is, for example, 1350 S
In the case of pm, even if the rotation of the crankshaft is started from a predetermined position (top dead center), the inertia of the crank mechanism, slide, etc. and the performance of the clutch device are greatly affected. Press speed cannot reach the set value. Accordingly, as shown in FIG. 6, the position of the bottom dead center of the slide is stable within a certain range during steady rotation, and the last variation at the time of pressing stop is, for example, 20 μm, whereas the first variation at the driving is Is twice as large as 43 μm. Therefore, not only cannot a product with a predetermined accuracy be produced, but also a defective product is generated every time the press is driven.

[0007] Such a problem is even more troublesome when a high-speed press is operated by switching the press speed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a press drive start position adjusting device capable of preventing occurrence of defective products when a slide passes through a first bottom dead center.

[0009]

According to a first aspect of the present invention, there is provided a main motor, a clutch device for transmitting rotational power to a crankshaft, and a brake device for applying a braking force to the crankshaft.
A drive start position adjusting device for a press for rotating a slide in a vertical stroke by rotating a crankshaft in a predetermined direction, wherein the crankshaft has an external force receiving surface for receiving an external force for rotating the crankshaft in a reverse direction. A rotation external force applying means for applying an external force for rotating the crankshaft in a reverse direction by a preset angle to the external force receiving surface on condition that the crankshaft is stopped rotating and the brake device is released. It is characterized by having.

[0010] The invention according to claim 2 is characterized in that the main motor,
A drive start position adjusting device for a press having a clutch device for transmitting rotational power to a crankshaft, a brake device for applying a braking force to the crankshaft, and rotating the crankshaft in a predetermined direction to vertically move a slide. Press speed setting means for setting a press speed; drive start position calculating means for obtaining a drive start position of the crankshaft based on the set press speed; and a slow rotation drive means for rotating the crankshaft at a slow speed. Current position detecting means for detecting the current position of the crankshaft; and controlling the slow rotation drive means while comparing the calculated drive start position with the detected current position to calculate the crankshaft. Drive start position adjustment control means for stopping at the drive start position,
It is characterized by having.

[0011]

According to the first aspect of the present invention, when the crankshaft is stopped at a predetermined position such as the top dead center by a conventional method, the external rotating force applying means operates on condition that the brake device is released thereafter. Thus, an external force in a predetermined direction is applied to the external force receiving surface. Therefore, the crankshaft is turned in the opposite direction by the set angle. Therefore, if the angle for rotating the crankshaft in the reverse direction is set in advance to an appropriate value according to the Spm, the driving start position of the crankshaft for the next press operation can be automatically adjusted. , The bottom dead center position of the slide can be set as the set position even when passing through the bottom dead center, so that a product can be produced from the first punch and the occurrence of defective products can be prevented.

According to the second aspect of the present invention, the press speed is set in advance using the press speed setting means, and the position adjustment command is issued manually or automatically. Then, the drive start position calculation means obtains the drive start position according to the set press speed, and the current position detection means automatically detects the current position of the crankshaft. Here, the drive start position adjustment control means controls the slow rotation drive means while comparing the calculated drive start position of the crankshaft with the detected current position,
The crankshaft is rotated in the reverse direction so that the detected current position becomes equal to the calculated drive start position, and then stops there. Therefore, even when the press speed switching operation is performed, the press can be started from the drive start position that is optimal for the press speed, so that it is possible to produce a high-accuracy product from the first pass of the bottom dead center, that is, from the first punch. it can.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) As shown in FIG. 1, the present drive start position adjusting apparatus is provided with a bracket 1B (1F) on a crankshaft 1 and an external rotational force applying means (40, 50) to a predetermined position (a crank angle of 0 °). ), The crankshaft 1 stopped at a predetermined angle (θc) is rotated in the opposite direction by a predetermined angle (θc) so that the drive start position (θ) of the crankshaft 1 can be automatically adjusted.

First, in this press, the rotational power of a main motor is connected to a crankshaft 1 via a flywheel and a clutch device, and the crankshaft 1 is rotated in a predetermined direction (R direction) shown in FIG. Can be stopped by moving the clutch device up and down, disengaging the clutch device and performing the brake operation of the brake device. In addition, by the press operation control device (not shown),
The press is stopped so that the crankshaft 1 is at a predetermined position, that is, the crank angle is 0 degrees.
Further, a switching operation of the press speed (Spm) can be performed, and a high speed operation at a set speed of, for example, 1000 Spm or more can be performed.

As shown in FIG. 1, the crankshaft 1 has an external force receiving surface 1F. In this example,
The external force receiving surface 1F is formed by the right side surface of the bracket 1B fitted and fixed to the crankshaft 1 in the drawing. That is,
If an external force is applied to the external force receiving surface 1F, the crankshaft 1 can be rotated in a direction opposite to a predetermined direction (R direction) during the press operation.

Next, the rotating external force applying means includes a crankshaft 1
Is a means for applying an external force to rotate the crankshaft 1 in a reverse direction by a predetermined angle to the external force receiving surface 1F on condition that the rotation is stopped and the brake device is released. , And a control device (40) that also serves as a part of the press operation control device 40.

The external force generating means 50 is, as shown in FIG.
It comprises a cylinder device (cylinder 51, piston 52, piston rod 53) and a hydraulic pressure switching valve 55. Both 51,
55 is connected by pipes 57 and 58, and a supply pipe 56 and a return pipe 59 are connected to the hydraulic pressure switching valve 55.

The hydraulic switching valve 55 is provided with a control device (40).
When the adjustment signal S is input from the controller 51, hydraulic pressure is supplied to the one chamber 51R of the cylinder 51 through the pipe 57, and the piston rod 53 projects leftward as shown by a two-dot chain line in FIG.
ST10), an external force can be applied to the external force receiving surface 1F.
On the other hand, when the adjustment signal S is extinguished, the hydraulic pressure is supplied to the other chamber 51L through the pipe 58, and the piston rod 53 can be pulled back to the right (ST12).

When the piston rod 53 is retracted, the piston rod 53 is located so as not to collide with the bracket 1B even when the crankshaft 1 rotates. In addition, the amount of protrusion of the piston rod 53 can be appropriately determined and can be implemented as a variable type.
When the crankshaft 1 is set at 0 Spm or more, the crankshaft 1 can be rotated in a reverse direction by an angle θc shown in FIG. 1 from a predetermined position (0 degree).

That is, if the position at which the crankshaft 1 is rotated reversely by the angle θc (crank angle θ) is set as the drive start position, even if the press is started at, for example, 1000 Spm after the first bottom dead center pass, The crankshaft 1 can reach the predetermined rotation speed (1000 Spm), and the bottom dead center of the slide can be made the same as that in the normal operation.

On the other hand, in the case of this embodiment, the control device (40) comprises the press operation control device 40 including the CPU, ROM, RAM and the like as described above. Then, the adjustment signal S is output on condition that the brake device is released. Also, when the piston rod 53 reaches the protruding limit,
The adjustment signal S is extinguished. Specifically, the drive start position adjustment control shown in FIG. 2 is performed.

Prior to the drive start position adjustment,
The press operation control device 40 is configured to release both the clutch device and the brake device.

Next, the operation of the first embodiment will be described.
In a conventional manner, the clutch device is released and the brake device is braked and the press is stopped. in this case,
The crankshaft 1 is located at a predetermined target position, that is, the crank angle is 0.
Stopped at the top (dead center). When the press speed in the next press operation is set to 1000 Spm, the control device (40) forming the external rotating force applying means outputs the adjustment signal S on condition that the brake device is released (FIG. 2). ST10).

Then, the hydraulic pressure switching valve 55 is switched, and the hydraulic pressure is supplied to the one chamber 51R of the cylinder 51. Here, the piston rod 53 protrudes leftward as shown by a two-dot chain line in FIG. 1 and applies an external force to the external force receiving surface 1F. Therefore, the crankshaft 1 rotates in the opposite direction by the predetermined angle θc, and is automatically adjusted to the drive start position θ corresponding to 1000 Spm (ST10).

When the automatic adjustment is completed, that is, it is confirmed by the limit switch or the like that the piston rod 53 has reached the projecting limit (YES in ST11), the control device (40) disappears the adjustment signal S after the brake operation, and The piston rod 53 is pulled back (ST12).

Thus, when the press operation is started from the adjusted drive start position θ, the crankshaft 1 can reach the rotation speed of 1000 Spm at the first passage of the bottom dead center. Non-defective products can be prevented.

According to the first embodiment, however, the external force receiving surface 1F is formed on the crankshaft 1 and the rotational external force applying means (40, 50) is provided, and the predetermined position (top dead center) is obtained by a conventional method.
Pressing the crankshaft 1 stopped at
m) can be automatically adjusted to the driving start position θ corresponding to the crankshaft 1 at the first passage through the bottom dead center.
Can be reliably reached to the set press speed (1000 Spm). Therefore, occurrence of defective products can be prevented.

Further, since the external force receiving surface 1F is formed from the bracket 1B and the rotational external force applying means is formed from the external force generating means 50 and a control device which also serves as the press operation control device 40, the structure is simple and smooth. Can be adjusted.

(Second Embodiment) This second embodiment is shown in FIG.
As shown in FIG. This second embodiment is different from the first embodiment in that 10
Although the configuration is such that the drive start position θ can be adjusted to one drive start position θ at which a defective product can be prevented when the press speed is set to 00 Spm or more, the optimal drive start position θs is set according to the set press speed (Spm). It is configured so that the product accuracy of the first punch can be further improved by automatic adjustment.

That is, as shown in FIG. 3, the present drive start position adjusting device comprises a press speed setting means (Spm setting device 4).
2) and drive start position calculation means (press operation control device 4)
0), slow rotation drive means 30, current position detection means (encoder 8), and drive start position adjustment control means (control device 4).
0), and if the press speed (Spm) is set, it can be automatically adjusted to the optimum drive start position.

Although not shown in the first embodiment, when a predetermined air pressure is supplied to the cylinder chamber 11, the clutch device 10 is connected to the flywheel 4 and the crankshaft 1 via the friction plate 13.
(Right end 1R) and can be separated (clutch disengaged) by the biasing force of the spring 12 if a predetermined air pressure is withdrawn. The supply / extraction of the predetermined air pressure is performed by turning on / off the clutch solenoid 10S.

On the other hand, the brake device 20 normally presses the friction plate 23 by the urging force of the spring 22 to perform a brake operation, and can fix the crankshaft 1 (left end 1L) to the machine body 7. When the brake solenoid 20S is turned on and a predetermined air pressure is applied to the cylinder chamber 21 of the cylinder 24,
The friction plate 23 is free, that is, the brake device 20 is released, and the rotation of the crankshaft 1 is permitted.

The clutch device 10 and the brake device 2
0 is the opposite operation. In addition, both 10,
20 may be integrated. Further, the two members 10, 20 can be released independently and simultaneously. In particular,
At the time of slow rotation, it is automatically performed by the drive start position adjustment control means (40).

The flywheel 4 is supplied with rotational power from a main motor 6 (driver 6M). Therefore, the operation signal S is generated by pressing the press operation button 45.
TR is output, and the press operation control device 40 turns on the clutch solenoid 10S and the brake solenoid 20S.
Then, the clutch device 10 is engaged, and the brake device 20 is operated.
Release the brake. Here, flywheel 4
Is transmitted to the crankshaft 1 via the clutch device 10. When the press stop button 46 is pressed,
The stop signal STP is output, and the clutch device 10 and the brake device 20 are operated in the opposite manner to the above case. In addition,
In FIG. 3, reference numeral 2 denotes an eccentric part, and reference numeral 3 denotes a slide.

Now, Sp forming the press speed setting means will be described.
The m setting device 42 is a means for setting a press speed (Spm) to be operated. Set press speed (S
pm) determines the rotation speed of the main motor 6 whose rotation is controlled by the press operation control device 40.

The drive start position calculation means calculates the optimum crankshaft 1 based on the press speed (Spm) set in this way when starting the drive at the set press speed.
Is calculated (θs). In the case of this embodiment, the CPU, RO,
M, RAM, etc., and are executed in ST20 and ST21 in FIG. That is, the drive start position (θs) is stored in the ROM
According to the arithmetic expression [θs = f (Spm)] stored in CP
U is formed to automatically calculate. However, instead of using the function calculation method, the present invention can also be implemented by using a configuration in which each press speed (Spm) and each drive start position (θs) are retrieved from a table in which comparison storage is performed.

Here, the drive start position θs is defined as the rotation of the crankshaft 1 when the slide 3 descends to the vicinity of the bottom dead center when the clutch device 10 is engaged and the press operation is started from the position (θs). This is a position where the speed can reach the Spm. In other words, it precedes the usual press stop position. Therefore, the leading amount increases as Spm increases.

Next, the slow rotation drive means 30 includes a low speed motor 32 (driver 32M), a worm screw shaft 31, and a worm wheel 24 incorporated in the brake device 20, and rotates the worm screw shaft 31. The brake device 20 and the brake device 20 are formed so that the crankshaft 1 can be rotated at a low speed. The brake device 20 (cylinder 24
) Are normally locked to the body 7 via the worm screw shaft 31. Further, the rotation direction is determined by the forward signal Vf and the reverse signal Vr output from the press operation control device 40, that is, the drive start position adjustment control means (40).
The forward signal Vf rotates the crankshaft 1 in a predetermined direction (R direction), and the reverse signal Vr rotates the crankshaft 1 in the opposite direction.

Encoder 8 forming current position detecting means
Consists of an absolute encoder that detects the crank angle with a resolution of 0.5 degrees, and its angle (position) signal θ
f is output to the drive start position adjustment control means (40).

Here, the drive start position adjustment control means (4
0) is constructed using the components of the press operation control device 40 including the CPU, the ROM 41, the RAM, and the like, and the functions thereof, and is executed in ST22 to ST27 in FIG. That is, the slow drive unit 30 (32M) is controlled while comparing the calculated drive start position (crank angle) θs with the detected current position (crank angle) θi to stop the crankshaft 1 at the calculated drive start position θs. Let it.

In the second embodiment having such a configuration, when the press speed (Spm) to be operated is set in the press speed setting device 42 and an automatic adjustment command is issued, first, the drive start position calculating means (40) The press speed (Spm)
Is calculated (ST20 and ST21 in FIG. 4).

Here, the drive start position adjustment control means (4
0) reads the calculated drive start position θs and the current position θi detected by the encoder 8 (ST22),
Slow rotation drive means 30 (32M) while comparing s and θi
Control. That is, when θi> θs (S
At T23 (YES), since the stop position of the crankshaft 1 is too advanced, the reverse signal Vr is output (ST24), and the crankshaft 1 is rotated in the reverse direction at a low speed. Then, the crankshaft 1 is positioned at the calculated drive start position θs and stopped there (ST27). If θi <θs, a forward signal Vf is output (ST25) to rotate in a predetermined direction (ST25).
26).

Prior to executing the drive start position adjustment control, the press operation control device 40 has released the clutch device 10.

According to the second embodiment, the pressing speed setting means (42) and the driving start position calculating means (4)
0), slow rotation drive means (30), current position detection means (8), and drive start position adjustment control means (40),
Just set the press speed (Spm) and crankshaft 1
Is automatically adjusted to a corresponding optimal drive start position (θs), so that even when the operation is switched to a desired press speed (Spm), the crankshaft 1 is moved at the first passage through the bottom dead center. Since the speed can be set to the predetermined value, it is possible not only to prevent the occurrence of defective products but also to produce products with higher precision from the first punch.

(Third Embodiment) In this third embodiment, the drive start position θs prepared for the next press operation when the previous press was stopped.
1 is configured so that the crankshaft 1 can be automatically stopped.

That is, although the configuration of the third embodiment is basically the same as that of the second embodiment (FIG. 3), the press speed setting means (42) is used to set the press speed during the next press operation. (Spm) is also settable, and the automatic adjustment (ST32 to ST38) is immediately performed when the drive start position adjustment control means (40) is stopped by a conventional method (ST30, 31 in FIG. 5). It is formed so that it can be done.
Note that ST32 to ST38 are the same as ST21 to ST27 of FIG.

Therefore, the third embodiment can provide the same operation and effects as those of the second embodiment, and furthermore, it is not necessary to adjust the driving start position prior to the press operation. Can be further increased.

[0048]

According to the first aspect of the present invention, the external force receiving surface is formed on the crankshaft, and the external force receiving surface is provided with a rotary external force applying means for applying an external force for rotating the crankshaft in the opposite direction by the set angle. Configuration, for example, 1000S
Even at the time of high-speed press operation exceeding pm, occurrence of defective products due to the first passage through the bottom dead center can be prevented.

According to the second aspect of the present invention, the crankshaft is set by providing the press speed setting means, the drive start position calculating means, the slow rotation drive means, the current position detecting means and the drive start position adjustment control means. It is configured to automatically adjust to the optimal driving start position corresponding to the set press speed, so even if the press speed is set to a high speed and an arbitrary value, a high-precision product is produced from the first punch. be able to.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation.

FIG. 3 is a configuration diagram showing second and third embodiments.

FIG. 4 is a flowchart for explaining the operation of the second embodiment.

FIG. 5 is a flowchart for explaining the operation of the third embodiment.

FIG. 6 is a diagram for explaining a problem of a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Crankshaft 1B Bracket 1F External force receiving surface 2 Eccentric part 3 Slide 4 Flywheel 6 Main motor 7 Body 8 Encoder (current position detection means) 10 Clutch device 10S Solenoid for clutch 20 Brake device 20S Solenoid for brake 24 Warm wheel 30 Slow speed Rotation drive means 31 Worm screw shaft 32 Motor 32M driver 40 Press operation control device (External rotation force applying means, Drive start position calculation means, Drive start position adjustment control means) 41 ROM 42 Spm setting device (Press speed setting means) 45 Operation button 46 Stop button 50 External force generating means (rotary external force applying means) 51 Cylinder 53 Piston rod 55 Hydraulic pressure switching valve

Claims (2)

(57) [Claims] 1. A drive for a press which has a main motor, a clutch device for transmitting rotational power to a crankshaft, and a brake device for applying a braking force to the crankshaft, and rotates the crankshaft in a predetermined direction to move the slide vertically. A start position adjusting device, wherein the crankshaft forms an external force receiving surface for receiving an external force for rotating the crankshaft in a reverse direction, and that the crankshaft is stopped rotating and the brake device is released. A driving start position adjusting device for a press, characterized in that a rotation external force applying means for applying an external force for rotating the crankshaft in a reverse direction by a preset angle is provided on the external force receiving surface in a condition. 2. A drive for a press which has a main motor, a clutch device for transmitting rotational power to a crankshaft, and a brake device for applying a braking force to the crankshaft, and rotates the crankshaft in a predetermined direction to move the slide vertically. A start position adjusting device, comprising: press speed setting means for setting a press speed; drive start position calculating means for obtaining a drive start position of the crankshaft based on the set press speed; A slow rotation drive unit for rotating, a current position detection unit for detecting a current position of the crankshaft, and controlling the slow rotation drive unit while comparing the calculated drive start position with the detected current position. Drive start position adjustment control means for stopping the crankshaft at the calculated drive start position. Location.