JPH0338004B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for rotating a die of a press machine.

Conventionally, there has been no satisfactory mold rotation method for this type of press machine, and it is difficult to correct the rotational position of the mold due to variations in the transmission system that rotates the mold, such as bumps caused by meshing of gears. There was a case.

This invention was devised in view of the above-mentioned problems, and an object of the present invention is to provide a method for correcting the rotational position of a mold in a press machine, which can correct variations in the rotational position of a mold in a press machine and determine the rotational position of the mold with high precision. This is the purpose.

In order to achieve this objective, the present invention provides a rotary base with a plurality of rotary molds rotatably provided, a driven gear for each rotary mold integrally provided, and a driving gear meshed with each driven gear. In a press machine in which a plurality of drive gears are connected in conjunction with the same drive device, the rotary mold is installed close to the rotary mold, and the rotary mold is rotated. By detecting the member to be detected, the type of rotary mold positioned in the processing section is determined, and the rotation direction of the positioned rotary mold is detected, and when this rotation direction changes, the The drive device is controlled to rotate a predetermined rotary mold by taking into consideration the backlash amount of the drive gear and driven gear corresponding to the rotary mold.

Hereinafter, one embodiment of the present invention will be described in detail based on the accompanying drawings.

FIG. 1 is a front view showing a turret punch press 1, in which a large number of punches 5 are mounted on an upper turret 3 as a rotatable base, and a large number of dies 7 corresponding to the large number of punches 5 are mounted. is attached to a lower turret 9 which is a rotatable base.

A striker 11 is suspended above the upper right side of the upper turret 3 in FIG. A work clamp device 13 for clamping and inserting a plate-shaped work W between the upper and lower turrets 3 and 9 below the striker 11 is installed between the upper and lower turrets 3 and 9.
It is provided so as to be movable back and forth, left and right, toward 9.

Next, the mold rotation mechanism will be explained using FIGS. 2 to 5.

FIG. 2 is a plan view showing the upper turret 3 or lower turret 9 and the mold rotation mechanism, and shows a large number of punches 5.
Among the die 7, the punch 5 as a rotatable rotary mold is 5a, 5b, and the die 7 is 7a, 7b.
It is. The positions of the punch 5b and the die 7b as the rotary mold in FIG. 2 are the processing positions for the workpiece W, that is, the striker 11 in FIG.
This is the lower position.

FIG. 3 is a cross-sectional view taken in the direction of the - arrow in FIG. is installed. A driven gear 23 is located above the drive gear 21 attached to the drive shaft 19 of the drive device 17 in FIG.
However, a driven gear 25 is meshed with the lower part.

The driven gear 23 rotates the punches 5a, 5b as rotary molds of the upper turret 3, and the driven gear 25 rotates the dies 7a, 7b as rotary molds of the lower turret 9. Below, the driven gear 23 that rotates the punches 5a and 5b
Since the mechanism from and the mechanism from the driven gear 25 that rotates the dies 7a and 7b are substantially the same, the same parts in the former and the latter will be given the same reference numerals to simplify the explanation.

One end of a connecting shaft 27 is attached to the driven gear 23 (25) facing the upper turret 3 (lower turret 9), and a pulley 29 is attached to the other end of the connecting shaft 27. A timing belt 35 is wound between the pulley 29 and a pulley 33 in a transmission device 31 shown in FIG. This pulley 33 is attached to a transmission shaft 39 rotatably provided on a frame 37 of the transmission device 31.

A transmission gear 41 is attached coaxially with the transmission shaft 39, and at the upper part of the transmission gear 41 in FIG. are engaged.

A plurality of spline holes 47 are bored inside the cylindrical body 43 in the direction in which the cylindrical body 43 extends.
A spline shaft 49 is engaged with the spline hole 47 and slidably inserted into the cylindrical body 43 . A fluid pressure cylinder 51 is attached to one end of the spline shaft 49 on the opposite side from the upper turret 3.
That is, the spline shaft 49 slides in the left-right direction in FIG. 5 due to the operation of the fluid pressure cylinder 51.

A connecting device 53 is connected to one end of the spline shaft 49 on the upper turret 3 side.

On the other hand, drive gears such as worm portions 57 are provided at both ends of a rotatable driven shaft 55 that extends in the radial direction of the upper turret 3 (lower turret 9). It is formed. When the coupling device 53 is moved to the right in FIG. 5 by the fluid pressure cylinder 51 via the spline shaft 49, the end 59 of the driven shaft 55
59b and the connecting device 53 are in a connected state.

FIG. 4 is a cross-sectional view of FIG. 2 (in this case, a cross-sectional view of the upper turret 3 with the punch 5b attached)
A cylindrical holding member 61 is mounted inside the upper turret 3 in the vertical direction as shown in FIG. Inside this holding member 61 is a bearing member 6 such as a bearing.
A cylindrical rotation holding member 65 rotatable via 3
is installed. A punch guide 67 is mounted inside the rotation holding member 65, and a key groove 69 is formed on the outer peripheral side of the punch guide 67 in the vertical direction in FIG. And this keyway 69
A key 71 protruding from the inside of the rotation holding member 65 is inserted into the key 71 .

Inserted into the punch guide 67 is a punch 5b as a rotary mold that can be moved up and down as shown in FIG. A key 72 is attached to the outer peripheral side of the punch 5b, and the key 72 is inserted into the key groove 69 described above. Further, the punch 5b is always urged upward by a bullet 73 such as a spring. Further, the punch 5a as a rotary mold is also used as the punch 5a.
It is provided in the upper turret 3 so that it can be raised and lowered in substantially the same manner as that shown in FIG. Furthermore, the die 7a as a rotary mold
The die 7b is also rotatably provided in the lower turret 9 in substantially the same manner as the punch 5b.

A flange portion 75 projecting from the upper turret 3 is formed at the upper portion of the rotation holding member 65. A driven gear such as a worm gear part 77 formed on the outer peripheral part of this flange part 75 is
It is meshed with a drive gear such as the worm portion 57 of the driven shaft 55 described above. That is, the driven shaft 55
Due to this rotation, the rotation holding member 65, punch guide 67, and punch 5b rotate together via the worm portion 57 and the worm gear portion 77.

Further, in the vicinity of the punch 5a and the punch 5b, which serve as rotary molds of the upper turret 3, a dog 78a and a dog 78b are provided as members to be detected. Then, the turret 3 rotates and the punch 5 is positioned below the striker 11.
A sensor 79, such as a proximity switch, is suspended from the main body of the turret punch press 1 to detect whether the punch is the punch 5b or the punch 5b using the dog 78a and the dog 78b. In addition, as shown in FIG. 2, the dogs 78a, 78
The types of punches 5a and 5b can be determined by the difference in the number of b.

Next, the effect of the above configuration will be explained.

The upper turret 3 and lower turret 9 are rotated to position the punch 5b and die 7b below the striker 11. This punch 5b and die 7b
The sensor 79 detects that the striker 11 is positioned below the striker 11. Then, by operating the cylinder 51, the spline shaft 49 is slid inside the cylinder body 43 in the right direction in FIG. A coupling device 53 that moves toward the driven shaft 55 as the spline shaft 49 slides is coupled to an end 59a of the driven shaft 55.

Thereafter, the drive device 17 is driven to rotate the punches 5a, 5b and the dies 7a, 7b as rotary molds and stop them at predetermined positions. Transmission from this drive device 17 to the rotary mold is performed as follows.

When the drive device 17 is driven, the drive gear 21 rotates via the drive shaft 19. The rotation of the drive gear 21 causes the driven gear 23 and the driven gear 25 to rotate, respectively. Hereinafter, the transmission from the driven gear 23 that rotates the punches 5a, 5b and the transmission from the driven gear 25 that rotates the dies 7a, 7b are substantially the same.

The rotation of the driven gear 23 (25) causes the connection shaft 27 to
The pulley 29 rotates via. The rotation of pulley 29 is transmitted to pulley 33 in FIG. 5 via timing belt 35. As the pulley 33 rotates, the transmission gear 4 is transmitted through the transmission shaft 39.
1 rotates. Gear 4 due to rotation of transmission gear 41
The cylinder body 43 also rotates with the rotation of the cylinder 5. Furthermore, cylinder body 4
3 rotates the spline shaft 49 and the coupling device 53.

As the coupling device 53 rotates, the driven shaft 55 rotates via the end portion 59a coupled to the coupling device 53. When the driven shaft 55 rotates, the rotation holding member 65 having the worm gear portion 77 meshed with the worm portion 57 of the driven shaft 55 rotates. As the rotation holding member 65 rotates, the punch guide 67 and the punch 5b also rotate. Then, when the punch 5b rotates to a predetermined position,
The drive device 17 stops. When the punch 5b is rotating, the punch 5a is also rotating at the same time in the opposite direction to the rotation direction of the punch 5b.

In this way, from the drive device 17 to the driven gear 2
3, the punches 5a and 5b rotate through the die 7 of the lower turret 9 corresponding to the punches 5a and 5b.
Similar to the punches 5a and 5b of the upper turret 3, the punches a and 7b also rotate via the driven gear 25 and stop at a predetermined position. Then, the work W clamped by the work clamp device 13 is processed by the punch 5b and the die 7b while being inserted between the upper turret 3 and the lower turret 9 below the striker 11.

After the workpiece W has been processed by the punch 5b and the die 7b, the following actions are performed when positioning another die below the striker 11 for use. That is, in order to release the connection between the end 59a of the driven shaft 55 and the connection device 53, the cylinder 51
is operated to slide the spline shaft 49 to the left in FIG. As the spline shaft 49 slides, the coupling device 53 separates from the end 59a of the driven shaft 55. From this state, below the striker 11,
For example, in order to position the punch 5a and die 7a, the upper turret 3 and lower turret 9 are each rotated 180 degrees.

When the punch 5a and the die 7a are positioned below the striker 11, the driven shaft 55 rotates 180 degrees along with the upper and lower turrets 3 and 9. Then, by operating the cylinder 51, the coupling device 53 is moved to the right in FIG. 5 via the spline shaft 49. When the coupling device 53 moves rightward in FIG. 5, it is coupled to the end 59b of the driven shaft 55. Connecting device 5
When the connection partner of No. 3 is changed from the end portion 59a to the end portion 59b, the rotation of the driven shaft 55 is different before and after the change even though the driving direction of the drive device 17 is the same. Therefore, punches 5a, 5b and die 7
The rotations of all the rotary molds a and 7b are also different before and after the change.

At this time, the worm part 57, the worm gear part 7
If there is a backlash on 7, punch 5
a, a difference in backlash amount and a difference in directionality occur between the die 7a, the punch 5b, and the die 7b. Here, the backlash means the warm part 5.
7. It refers to the clearance of the meshing part of the worm gear part 77. Therefore, the rotary mold positioned below the striker 11 is the punch 5a and the die 7a, or the punch 5b and the die 7a.
b is detected by the dogs 78a, 78b and the sensor 79, and based on this detection signal, a command for the rotation direction of the rotary mold is calculated by the calculation unit on the numerical control side.
Processes the correction amount and directionality of the backlash.

Next, a mold rotation position correction method will be described.

The counterclockwise rotation of the drive device 17 when viewed from the left side of FIG. 3 is referred to as normal rotation, and the clockwise rotation is referred to as reverse rotation. Further, in FIG. 2, the counterclockwise rotation of the rotary mold is referred to as normal rotation, and the clockwise rotation is referred to as reverse rotation.

When the workpiece W has been processed by the punch 5a and the die 7a or the punch 5b and the die 7b, the other punch 5 and the die 7 are moved to the striker 11.
Before rotating the upper and lower turrets 3 and 9 for downward positioning, the punch 5a, die 7a, punch 5b, and die 7b as each rotary mold are rotated in the return direction to the origin (predetermined stop position of the rotary mold). to erase the backlash amount.

The rotation direction of the drive device 17 in this case is as follows.

When returning to origin for the first time...Forward rotation When returning to origin when selecting another punch 5 and die 7 after using punch 5a and die 7a...Forward rotation Using punch 5b and die 7b When returning to the origin when selecting another punch 5 and die 7 from ... Reversal As is clear from the above, punch 5a as a rotary mold, die 7a and punch 5 as a rotary mold.
b and die 7b are located below the striker 11, the direction of rotation of each rotary mold when returning to the origin is the same.

Next, let θa be the backlash amount of the punch 5a and the die 7a, and θb be the backlash amount of the punch 5b and the die 7b.

In this state, when the punch 5a and the die 7a are positioned below the striker 11, the punch 5a
When the punch 5a and the die 7a are first rotated in the normal rotation direction and when they are further rotated in the same direction as the direction in which they have been rotated, the punch 5a It is not necessary to correct the backlash amount for the rotation of the die 7a and the die 7a. However, punch 5a and die 7a
When first rotating and reversing in the reverse direction, a backlash amount θa is added.

Further, when the punch 5b and the die 7b are initially rotated in the normal rotation direction and when they are reversed, a backlash amount θb is added. However, punch 5
When rotating punch 5b and die 7b in the reverse direction for the first time or when rotating them in the same direction as before, the rotation of punch 5b and die 7b is not affected by back crushing. There is no need to correct the amount of backlash for .

Next, the flowchart shown in FIG. 6 will be explained.

In step 101, it is determined whether the rotary mold positioned below the striker 11 is the punch 5a and die 7a or the punch 5b and die 7b. Then, the determined rotary molds are the punch 5a and the die 7.
If it is a, punch 5a and die 7 are inserted in step 103.
It is determined whether there is a rotation angle command for a.

FBR1 in step 105 is called a backlash flag and indicates whether the backlash is affecting the forward rotation side or the reverse rotation side. In the case of the punch 5a and die 7a, as shown in Fig. 7a, the state in which the backlash is eliminated in the forward direction (counterclockwise) is "0", and as shown in Fig. 7b, the state in which the backlash is eliminated is "0", and in the reverse direction (clockwise ), the state in which the backup has been deleted is set to "1".

In the case of the punch 5b and the die 7b, the state where the backlash is eliminated in the forward direction is "1", and the state where the backlash is eliminated in the reverse direction is "0".

Next, when it is determined in step 103 that a rotation angle command has been issued to the punch 5a and die 7a, the backlash in the normal rotation direction of the punch 5a and die 7a has been erased, so step 105 is executed.
Follow the flowchart from NO to step 107
Proceed to.

In step 107, rotation angle command values (hereinafter referred to as command values) for the punch 5a and the die 7a and the punch 5
The difference between a and the current value of die 7a (hereinafter referred to as current value) is calculated. When the punch 5a and die 7a are to be rotated in the normal direction, the process proceeds to step 109, where the drive device 17 is rotated in the normal direction by the difference between the command value and the current value. That is, there is no need for correction of backlash. When the punch 5a and the die 7a are to be reversed, the process proceeds to step 111, where the drive device 17 is reversed by an amount equal to the backlash amount θa added to the difference between the command value and the current value.

In step 111, the punch 5a and die 7a are reversed, so the direction of erasing the backlash is
Figure 7a has changed to Figure 7b. Therefore,
Bracket flag (FBR1) at step 113
from "0" to "1".

Next, in step 113, when the drive device 17 is rotated in the forward direction from the state where the backlash flag is "1", the backlash flag becomes "0", and the process proceeds from step 105 in the NO direction, following the same flow as described above. You will have to follow the chart. However, when the drive device 17 is reversed to rotate the punch 5a and the die 7a in either the forward or reverse direction, the backlash flag is "1", so the steps from step 105 in the YES direction are executed. Proceed to 115.

In step 115, the difference between the command value and the current value is calculated. If the punch 5a and die 7a are to be further reversed, the process proceeds to step 117, where the drive device 17 is reversed by the difference between the command value and the current value. When the punch 5a and the die 7a are rotated in the forward direction after being reversed, the process proceeds to step 119, where the difference between the command value and the current value is determined by the backlash amount θa.
The drive device 17 is rotated in the normal direction by the amount added.

Since the punch 5a and the die 7a rotated in the normal direction in step 119, the erasing direction of the backlash is in the seventh direction.
Figure b has been changed to Figure 7a. Therefore, in step 121, the backup flag is changed from "1" to "0".

In other words, the steps 113 and 121 determine whether or not to add backlash during the next rotation, each time the rotation direction of the rotary mold consisting of the punch 5a and the die 7a changes to the forward or reverse direction. This means that the signal is switched and sent to step 105.

The above is an explanation of the flowchart when the rotary molds positioned below the striker 11 in step 101 are the punch 5a and the die 7a.

Next, in step 101, if the rotary molds positioned below the striker 11 are the punch 5b and the die 7b, the process advances to step 201. In this case, when the punch 5b and die 7b are reversed with the backlash flag in step 205 set to "0", that is, in the state shown in FIG. Reverse the drive 17.

When the punch 5b and the die 7b are to be rotated in the normal direction, the process proceeds to step 211, where the back-crush amount θb is added to the difference between the command value and the current value, and the drive device 17 is rotated in the normal direction. The crash flag is set to "1".

Further, when the back crush flag in step 205 is "1", that is, in the state shown in FIG. 7a, when the punch 5b and die 7b are rotated forward,
At 217, the drive device 17 is activated by the difference between the command value and the current value.
Rotate forward.

When the punch 5b and the die 7b are to be reversed, the process proceeds to step 219, where the back-crush amount θb is added to the difference between the command value and the current value, the drive device 17 is reversed, and in the next step 221, the back-crush is started. The flag is set to "0".

The driving device 17, the punch 5a as a rotary mold, and the die 7 according to the embodiment of the present invention described in detail above.
8 and 9 show the respective operations of the punch 5a, the punch 5b, and the die 7b. In the figure, ▲ indicates drive device 1
7 rotation stop position, △ indicates punch 5a, die 7
a, the respective rotation stop positions of the punch 5b, and the die 7b;
a, when the rotation stop positions of the punch 5b and the die 7b are the same, that is, the backlash is eliminated, and the counterclockwise direction is normal rotation and the clockwise direction is reverse rotation.

First, 801 in FIG. 8 shows that after positioning the punch 5a and die 7a below the striker 11,
a and die 7a and punch 5b and die 7b together
0°, that is, the state of return to origin is shown.

When a 90° command is input at 803 to rotate the drive device 17 in the normal direction, the punch 5a and the die 7a rotate in the normal direction, and the punch 5b and the die 7b rotate in the reverse direction, so there is no need to correct backlash. Therefore, the drive device 17 only needs to be rotated 90° in the normal direction.

Next, when a 0° command is input at 805, since it is faster to rotate the punch 5a and die 7a in the reverse direction than in the normal direction, the backlash θa is added and the drive device 1
7 is reversed by (90+θa) degrees, the punch 5a and die 7a stop at the 0° position. At this time, the punch 5b and the die 7b rotate in the normal direction, and the drive device 17
If the amount of rotation is (90+θb)°, then the distance between the punch 5b and the die 7b is 0°. However, in reality, as described above, the drive device 17 is rotated by (90+θa) degrees, so the punch 5b and die 7b are rotated at (θa).
It stops at the position of −θb)°, but this punch 5b
and die 7b are not used for processing, so there is no problem.

In 807, the workpiece W is formed using the punch 5a and die 7a.
After processing, when using other punches 5 and dies 7, punch 5a, die 7a, punch 5
b, the die 7b is returned to its origin. In this case, unlike rotating the punch 5a and die 7a in the 0° direction at 805 described above, the driving device 17 is always rotated in the normal direction. Therefore, since the rotation direction of 807 is different from that of 805, the drive device 17 and punch 5
Adding the backlash θa° existing between a and the die 7a, the driving device 17 is
Rotate the punch 5a, die 7a, punch 5
b. Return die 7b to the 0° position.

811 to 817 are cases in which the punch 5b and die 7b are used, that is, the punch 5b and die 7b are positioned below the striker 11.

In this case, since the upper and lower turrets 3 and 9 are each rotated 180 degrees from the case of 801 to 807 described above, when the drive device 17 is rotated forward, the punch 5b and die 7b are Since the shaft 55 rotates in the opposite direction, it rotates in the opposite direction. At this time, both punch 5a and die 7a are 801~
The direction of rotation is opposite to that of the 807.

813 is a case of 90° command, and when the drive device 17 is rotated in the normal direction, the punch 5b and the die 7b are rotated in the normal direction.
The amount of rotation of the drive device 17 is set to (90+θb) degrees by adding backlash amount θb. At this time, punch 5
The punch 5a and the die 7a stop at a position of -(90+θb-θa), but this does not matter since the punch 5a and the die 7a are not used for processing.

Figure 9 shows a punch 5a and a die 7 as a rotary mold.
a, the punch 5b, and the die 7b are each rotated at a negative angle, which is substantially the same as the case shown in FIG. 8, so a description thereof will be omitted. Note that 901 to 907 are cases in which the punch 5a and die 7a are positioned below the striker 11, and 911 to 917 are cases in which the punch 5a and die 7b are respectively positioned below the striker 11.

As described above, in this invention, a plurality of rotary molds are rotatably provided on a rotary base, a driven gear is integrally provided on each rotary mold, and a drive gear meshed with each driven gear is connected to a corresponding rotary mold. Provided close to the mold,
In a press machine in which a plurality of drive gears are interlocked and connected to the same drive device, the rotary mold is rotated and a detected member provided close to the rotary mold is detected. , determine the type of rotary mold positioned in the processing section, detect the rotation direction of the predetermined positioned rotary mold,
When the direction of rotation changes, this backlash is caused by controlling the drive device to rotate the predetermined rotary mold by taking into consideration the amount of backlash of the driving gear and driven gear corresponding to the predetermined rotary mold. can be easily and precisely corrected to adjust and position the rotary mold to a predetermined rotational position.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and may be implemented in other forms than the above-mentioned embodiments.

[Brief explanation of drawings]

Fig. 1 is a schematic front view of a turret punch press embodying the present invention, Fig. 2 is a plan view of the main part including the turret shown in Fig. 1, Fig. 3 is a sectional view taken along the - sectional arrow in Fig. 2, and Fig. 4 The figure is a sectional view of Fig. 2, Fig. 5 is a sectional view of Fig. 2, Fig. 6 is a flowchart, and Figs. FIG. 8 and FIG. 9 are explanatory diagrams showing the operation of the rotary mold. (Explanation of symbols representing main parts of the drawing), 3...
Upper turret, 5a, 5b...Punch, 7a, 7b
... Die, 9 ... Lower turret, 17 ... Drive device, 79 ... Detection means.

Claims (1)

[Claims] 1. A plurality of rotary molds are rotatably provided on a rotary base, a driven gear is integrally provided on each rotary mold, and a drive gear meshed with each driven gear is provided close to the corresponding rotary mold, In a press machine provided with a plurality of drive gears interlockingly connected to the same drive device, a method for rotating the rotary mold,
By detecting the detected member provided close to the rotary mold, the type of rotary mold positioned in the processing section is determined, the rotation direction of the predetermined positioned rotary mold is detected, and this Mold rotation characterized in that when the rotation direction changes, the drive device is controlled to rotate a predetermined rotary mold by taking into account the backlash amount of a driving gear and a driven gear corresponding to the predetermined rotary mold. Method.