JP4235192B2 - Mandrel control device - Google Patents

Description

  According to the present invention, the coil material supplied to the processing machine via the feeding means is fed out according to the supply amount by rotating the coil material holding portion with a drive motor, or the coil material discharged from the processing machine is The present invention relates to a mandrel for winding, and more particularly to a control device for controlling the feeding or winding speed of a coil material in the mandrel.

  When a coil material, which is an elongated strip-shaped material wound in a substantially cylindrical shape, is used in press working or the like, a mandrel is generally used as a means for holding the coil material.

  FIG. 6 shows an example of a press line including a mandrel. Reference numeral 1 denotes a press machine, and 2 denotes a mold including an upper mold and a lower mold. Reference numeral 3 denotes a feeding device that sandwiches the coil material 6 between a pair of upper and lower rolls, and intermittently supplies the coil material 6 at a predetermined length in accordance with the processing speed of the press machine 1. Reference numeral 4 denotes a pair of upper and lower loop sensors for detecting the upper limit position and the lower limit position of the loop of the coil material 6.

  5 is a mandrel. The mandrel can be held in a state where a coil material is wound around the holding portion 5a. The holding portion 5a is rotationally driven by a motor (not shown) and can feed out the coil material. The motor is controlled by the control device 5 b based on the detection signal from the loop sensor 4.

  The control device 5b is configured to switch the operation / stop of the motor in accordance with the output signal of the detection means 4. Here, the operation of the motor means that the motor is started and the number of rotations is switched stepwise.

  FIG. 7 shows the configuration of the control unit 5b. The control unit 5 b includes a calculation unit 12, a clock 13, a RAM 14, a setting switch 15, and an inverter 16, and is configured to receive a signal from the detection unit 17 and the switch 18 and control the drive motor 19. .

  The detection means 17 detects the upper limit position and the lower limit position of the loop of the coil material based on the output of the loop sensor 4, and outputs a start signal and a stop signal to the calculation unit 12, respectively.

  The switch 18 selects an operation mode of the drive motor 19 by the control unit 11 from automatic operation, manual operation, and inching operation.

  First, the arithmetic unit 12 controls the frequency of the rotational speed of the drive motor 19 via the inverter 16 and gradually increases the rotational speed of the drive motor 19 to a predetermined value when the start signal is input. When the stop signal is input, the rotational speed of the drive motor 19 is gradually decreased to stop.

  Next, the said calculating part 12 has a function as a time measurement part which measures the time for a coil material to reach | attain a minimum position from an upper limit position during a driving | operation. That is, the calculation unit 12 measures the time interval (measurement time t) between the start signal and the stop signal continuously input from the detection unit 17 based on the signal generated by the clock 13.

  Further, the arithmetic unit 12 and the setting switch 15 and the RAM 14 constitute a time setting unit for setting a target time T for the coil material to reach the lower limit position from the upper limit position during operation. That is, the target time T input by the setting switch 15 is stored in the RAM 14 via the calculation unit 12.

  In the setting switch 15 of the time setting unit, the maximum rotational speed F1 of the drive motor 19 is set as the steady operation frequency at the start. Further, an adjustment width Δf of the rotational speed of the drive motor 19 is also set. Both are stored in the RAM 14 together with the target time T.

  The calculation unit 12 compares the target time T with the measurement time t. When T> t, the operation frequency of the drive motor 19 is decreased by Δf, when T <t, Δf is increased, and when T = t. The current steady operation frequency is maintained, and the drive motor 19 is activated at the next activation with this steady operation frequency.

The setting of the target time T in the present embodiment can be set to an appropriate value according to the actual installation state of the detection means 17, the mandrel body, the feeding device, or the like. Since the rotation speed is controlled in small increments, it is possible to feed the coil material appropriately corresponding to the winding diameter of the coil material and the working speed of the processing line.
Japanese Patent Laid-Open No. 7-033301

  In the conventional mandrel control, the target time and the setting of the increase / decrease rate of the rotational speed of the drive motor are each one type. For this reason, there were the following limitations.

  First, the target time will be described. In the conventional control, a certain amount of coil material is fed out using an index called target time. This can also be considered as control in which the rotation speed of the mandrel spindle (that is, the rotation speed of the drive motor) is determined based on the winding diameter of the coil material at the time of the immediately preceding operation and a fixed amount is fed out.

  When the winding diameter of the coil material to the holding part 5a is relatively small and the rotational speed of the drive motor is high, the winding diameter decreases rapidly in a short time. In order to feed a certain amount of coil material, it is necessary to increase the rotational speed in accordance with the change in the winding diameter. For this purpose, the target time must be shortened and the rotational speed must be changed in a short time.

  Next, the increase / decrease rate of the rotational speed of the drive motor will be described. In order to feed a certain amount of coil material from the mandrel, it is necessary to increase the rotational speed when the coil material has a small winding diameter. As described above, since the target time is a short fixed time, it is necessary to accelerate and decelerate in a short time to a high steady rotational speed. Therefore, it is necessary to adopt a rapid increase / decrease rate that meets this condition.

  When the winding diameter of the coil material on the holding portion 5a is large, the target time and the increase / decrease rate of the rotational speed of the drive motor are not limited by the above. Nevertheless, in this case as well, since the short target time is set, the holding unit 5a is started and stopped more than necessary, and the drive motor rotational speed during steady operation increases. And because of the rapid increase / decrease rate setting, acceleration / deceleration is forced more than necessary. When the winding diameter of the coil material is large, the moment of inertia of the coil material is also increased, and there has been a problem in that the coil material is loosened and disturbed by these operations (break). There is also a problem that the drive motor is loaded more than necessary.

  In recent years, the press line has been increased in speed, and accordingly, it is required to have a higher feeding capacity of the coil material from the mandrel. The rotation speed of the main shaft of the mandrel driven by the drive motor is about 20 r / min, but about 30 r / min is now required, and the load on the brake and the drive motor becomes a more serious problem. I came.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a mandrel control device that always drives a drive motor of a mandrel at an optimum target time and an increase / decrease rate of the rotation speed of the drive motor to avoid fluctuations.

The mandrel control device according to the present invention feeds the coil material supplied to the processing machine via the feeding means according to the supply amount by the rotational drive of the drive motor, and winds the coil material discharged from the processing machine. A mandrel control device comprising: a detection unit for detecting an upper limit position and a lower limit position of a loop of a coil material; a time measurement unit for measuring a time for the coil material to reach a lower limit position from an upper limit position of the loop; A time setting unit for setting a target time to reach the lower limit position from the upper limit position of the loop, and switching the operation / stop of the driving motor of the mandrel when the coil material reaches the upper limit position or the lower limit position of the loop, and the time setting A control device for a mandrel having a control unit that compares the target time set in the unit with the measurement time of the time measuring unit and increases or decreases the rotational speed of the drive motor by a predetermined rotational speed. There are, furthermore the control unit has a frequency area setting unit for setting the operating frequency range of the drive motor as a plurality of frequency domain and a frequency setting unit for setting a steady-state operating frequency of the drive motor, the frequency setting unit The target time is set in accordance with which of the plurality of frequency regions set by the frequency region setting unit is the steady operation frequency of the drive motor set in (1 ).

  The control device for a mandrel according to the present invention is further characterized in that the drive motor is inverter-controlled and the steady operation frequency is increased or decreased by comparing the target time with the measurement time.

  The mandrel control device according to the present invention further includes a change rate setting unit that sets a change rate of an operation frequency corresponding to the frequency setting region, a storage unit that stores the steady operation frequency of the drive motor, and Computation means for comparing the steady operation frequency stored in the storage means and a reference value in the frequency region, and selecting a change rate and a target time of the operation frequency at the next operation based on the comparison result It is said.

  In the mandrel control device according to the present invention, when a stop signal is not input within a predetermined time after the target time elapses, the rotation speed of the drive motor is set at a predetermined rotation speed every predetermined time until a stop signal is input. It is characterized by raising.

  According to the present invention, it is possible to avoid a situation where the acceleration / deceleration of the drive motor of the mandrel is unnecessarily abruptly performed, and to optimally control the rotation speed during steady operation to prevent the coil material from being scattered and the rotation speed of the drive motor. Is always adjusted to the optimum condition.

Embodiments of the present invention will be described with reference to the drawings.
A mandrel control apparatus 10 according to an embodiment of the present invention will be described with reference to FIGS. An example of the mandrel is an uncoiler in a press working line as shown in FIG. In this embodiment, the components other than the mandrel are the same as those in the conventional example described with reference to FIG. The mandrel of the present embodiment is the same as the conventional mechanical structure for handling the coil material, but the control unit that controls the drive motor in response to a signal from the detection unit is different from the conventional one.

  As shown in FIG. 1, the control unit 11 is different from the prior art shown in FIG. 7 in the configuration of the setting switch 15, the RAM 14, and the calculation unit 12.

  As shown in FIG. 1 (b), the setting switch 15 has a frequency range that defines the rotation speed range of the drive motor of the mandrel in a plurality of regions in addition to the target time and adjustment width Δf of the prior art, and acceleration / deceleration of the drive motor. A frequency change rate that defines the degree of the is set. Further, instead of the maximum rotational speed F1 of the drive motor 19 of the prior art, a steady operation frequency that defines a frequency during steady operation of the drive motor when the mandrel is started is set.

  As shown in FIG. 1 (c), the RAM 14 stores, in addition to the adjustment width Δf of the prior art, the steady operation frequency of the drive motor at the time of starting the mandrel and the target time and the frequency change rate of the drive motor for each frequency region. The In FIG. 1C, the frequency regions are stored as three regions of a high rotation region (F (H)), an intermediate rotation region (F (M)), and a low rotation region (F (L)). On the other hand, the target time and the frequency change rate of the drive motor are stored. Although not shown, the upper limit value is stored in the intermediate rotation region (F (M)) and the low rotation region (F (L)).

  FIG. 2 shows a change in the number of rotations during operation of the drive motor of the mandrel for each frequency region. Here, the time points when the upper limit position detection switch of the loop sensor 4 is turned on (start-up signal) are displayed together. In any case, the rotational frequency of the motor increases at a constant rate, becomes constant when reaching a predetermined frequency, and decreases at a constant rate from the time when the lower limit position detection switch of the loop sensor 4 is turned on (stop signal).

  The rotational frequency increase rate of the motor is different for each frequency region. In FIG. 2, the frequency increase rate (Rinc (H)) for the high rotational region, the frequency increase rate (Rinc (M)) for the intermediate rotational region, and the low rotational region. Rinc (H)> Rinc (M)> Rinc (L) when the frequency increase rate (Rinc (L)) with respect to is compared, the same applies to the frequency decrease rate. In FIG. 2, the measurement time t for each driving condition is represented as t, t ′, t ″.

  The rotation frequency change rate and the steady operation frequency of the motor are determined by a comparison operation between the steady operation frequency (Rst) input from the setting switch and the upper limit value of the frequency domain which is the reference value of the frequency domain at the time of starting the device. Is activated by a comparison operation between a value obtained by performing a predetermined calculation on the steady operation frequency during the previous operation and an upper limit value in the frequency domain.

  The control action of the drive motor 19 by the control unit 11 will be described based on the flowchart shown in FIG.

  The control processing shown in FIG. 3 is performed by the arithmetic unit 12 executing a computer program in the RAM 14.

  As shown in FIG. 3, the steady operation frequency (Rst) is read in step S1. Rst is a value input from the setting switch at the time of activation. If Rst is read, it is checked in step S2 whether it is smaller than the upper limit value of the low rotation region (F (L)). If so, control proceeds to step S4. If smaller, in step S3, the frequency increase rate of the drive motor is set to Rinc (L), the frequency decrease rate is set to Rdec (L), and the target time is set to T (L).

  In step S4, it is checked whether it is smaller than the upper limit value of the intermediate rotation region (F (M)). If it is smaller, in step S5, the frequency increase rate of the drive motor is set to Rinc (M), the frequency decrease rate is set to Rdec (M), and the target time is set to T (M). If larger, the control sets the drive motor frequency increase rate to Rinc (H), the frequency decrease rate to Rdec (H), and the target time to T (H) in step S6.

  When the feeding device 3 starts operating in FIG. 6, the loop of the coil material is reduced, and the coil material comes into contact with the upper loop sensor 4, thereby outputting an activation signal. In step S7, the activation signal is detected. In step S8, it is checked whether the activation signal is input. When the activation signal is detected, the drive motor 19 is activated, and at the same time, the timer starts measurement in step S9.

  The drive motor 19 continues to operate at a constant rotational speed increase rate (for example, Rinc (L)) in step S10. During this time, the operation frequency is detected in step S11, and it is checked in step S12 whether the operation frequency matches the steady operation frequency Rst. When they match, the operation is continued while maintaining the frequency in step S13, and the operation frequency is stored in the RAM 14 as the steady operation frequency Rst in step S14.

  After the feed device 3 is activated, a stop signal is output when the coil material drawn by the rotation of the drive motor 19 contacts the lower loop sensor 4. In step S15, a stop signal is detected. In step S16, it is checked whether a stop signal is input. When a stop signal is detected, the timer ends measurement in step S17 and calculates a measurement time t. At the same time, the drive motor 19 shifts to a constant rotational speed reduction rate (for example, Rdec (L)) operation in step 18.

  In step S19, the operating frequency is detected, and in step S20, it is checked whether the operating frequency matches zero. If they match, the operation of the drive motor 19 is stopped in step S21.

  In step S22, it is checked whether the measurement time t is shorter than the target time T during the operation. If not smaller, control proceeds to step S24. If it is smaller, a value obtained by subtracting the adjustment width Δf from the steady operation frequency Rst stored in the RAM 14 in step S23 is calculated as a new Rst and stored in the RAM 14.

  In step S24, it is checked whether the target time T and the measurement time t are equal. If they are equal, the steady operation frequency Rst stored in the RAM 14 in step S25 is maintained as it is. If they are not equal, a value obtained by adding the adjustment width Δf to the steady operation frequency Rst stored in the RAM 14 in step S26 is calculated as a new Rst and stored in the RAM 14. Here, based on Rst stored in the RAM 14, the rotational speed increase rate Rinc, the target time T, and the like of the drive motor 19 are determined when the drive motor 19 is started next time.

  FIG. 4 shows the concept of the rotational speed transition of the drive motor 19 during the operation of the uncoiler in the press working line as shown in FIG. The holding part 5a has an outer diameter of about 800 mm, an inner diameter of about 200 mm, and a coil material width of about 100 mm. Since the winding diameter of the coil material to the holding portion 5a is large at the time of startup, the value (15 Hz) of the low rotation region (F (L)) is input as the steady operation frequency (Rst), and the drive motor 19 is in the low rotation region (F (L)) is operated under conditions such as a frequency increase rate Rinc (L) = 10 Hz / sec and a target time T (L) = 4 sec (FIG. 4A).

  Since the motor rotation rate is small and the target time is long, the steady operation frequency is also low. Since the coil material is moderately accelerated and the number of rotations is low, even if the winding diameter of the coil material is large, winding disturbance or the like does not occur.

  When the measurement time t is longer than the target time T (L), when the drive motor 19 is started next time, the operation is performed with the frequency obtained by adding the adjustment width Δf = 3 Hz to the current steady operation frequency (Rst) as Rst. The adjustment width Δf is 1/20 of the maximum frequency 60 Hz. As this operation is repeated, the vehicle is operated with the target time T (L) and the measurement time t balanced.

  As the winding diameter of the coil material of the holding portion 5a decreases, the amount of coil material that the drive motor 19 can rotate at a constant rotational speed decreases, and the measurement time t becomes longer than the target time T (L). Accordingly, Rst increases with a constant adjustment width Δf, and at a certain point, Rst exceeds the upper limit value (20 Hz) of the low rotation region and enters the intermediate rotation region (F (M)). Thereafter, operation is performed at a frequency increase rate Rinc (M) = 30 Hz / sec, target time T (M) = 3 sec, etc. in the intermediate rotation region (F (M)) (FIGS. 4B and 4C).

  When the winding diameter of the coil material is further reduced, the frequency increase rate Rinc (H) = 100 Hz / sec in the high rotation region (F (H)) exceeds the upper limit (35 Hz) of the intermediate rotation region (F (M)), the target time. It is operated under conditions such as T (H) = 2 sec. Since the winding diameter of the coil material is small, no winding turbulence or the like occurs even if it is accelerated rapidly. Further, since the target time T (H) is short, even if the winding diameter changes rapidly, the material feeding ability becomes insufficient, and the coil material does not stretch (FIG. 4D).

In the case where the mandrel control device according to the present invention is used, the control when the supply speed of the coil material to the press machine or the like suddenly increases will be described.
In a high-speed press or the like, the press is adjusted at a relatively slow speed when the press is adjusted, and when the adjustment is completed, the speed rapidly increases to the normal operation speed. It is necessary to control the coil material supply speed to follow this change.

  Take an uncoiler in the press line as shown in FIG. 6 as an example. FIG. 5 shows the concept of the transition of the rotational speed of the drive motor 19. It is assumed that the speed of the press machine is increased while the drive motor 19 is activated in the low rotation range (F (L)). . Due to this speed increase, the coil material is steadily supplied to the press machine, so that the loop of the coil material is not enlarged and does not come into contact with the lower loop sensor 4 and no stop signal is output.

  The drive motor 19 maintains the steady operation for a predetermined holding time ΔT = 1 sec after the target time T (L) has elapsed in the steady operation state, and increases the operating frequency by the adjustment width Δf after the holding time Δt has elapsed. This control is repeated until a stop signal is detected. In this process, when the operation frequency of the drive motor 19 corresponds to the intermediate rotation range (F (M)) and the high rotation range (F (H)), the rotation speed of the adjustment width Δf is increased according to the rotation speed increase rate of each area. Repeat. The holding time ΔT is input by the setting switch 15 and stored in the RAM 14.

When a stop signal is detected during operation, the rotational speed of the drive motor 19 is decreased and the next operation is performed in accordance with the operation conditions in the operation frequency region at that time.
By this control, a larger amount of coil material can be sent out than when driven under the conditions of the low speed operation region until a signal is detected, and a sudden increase in the driving speed of the coil material can be avoided.

  Although the case where the coil material is fed out has been described in the above embodiment, the same control can be applied when the mandrel is used for winding the coil material. In the case of winding, the start signal is detected at the lower limit of the loop sensor, and the stop signal is detected at the upper limit of the loop sensor. The winding diameter of the coil material is small at start-up and gradually increases. Along with this, the operating frequency is initially high and gradually decreases, and the frequency region also moves from the high rotation region to the intermediate rotation region / lower transfer region.

  In the above embodiment, the operation frequency region of the drive motor 19 is three regions, but the division of the operation frequency region is not limited to this, and more frequency regions and operation conditions may be defined. Specific values shown in the examples are illustrative and are not limited thereto. In the above embodiment, the change rate of the rotation speed of the drive motor 19 is controlled. However, the rotation speed after a predetermined time may be defined instead of the change rate.

  Further, in the above embodiment, the control in which the control for setting the different steady operation frequency for each operation frequency region and the control for setting the different target time are combined has been described. Good. In this case, for example, the switch 18 shown in FIG.

It is a block diagram of a control device concerning the present invention. It is a figure which shows the change of the rotation speed of the drive motor of the mandrel for every frequency domain. It is explanatory drawing of the flow of the control processing which concerns on this invention. It is a conceptual diagram of the drive motor rotation speed change of the control mandrel which concerns on this invention. It is a conceptual diagram which shows the change of the rotation speed of the drive motor of a mandrel when the feed speed of a coil material changes. It is a figure which shows an example of the conventional press line. It is a block diagram of the conventional control apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Press machine as a processing machine 3 Feeding device as feeding means 5 Mandrel 5b Control device 6 Coil material 10 Control device according to the present invention 11 Control unit acting as time measurement unit and time setting unit 17 Detection unit 19 Drive motor

Claims (4)

A control device for a mandrel that unwinds a coil material that is supplied to a processing machine via a feeding means according to a supply amount and winds the coil material that is discharged from the processing machine by rotating the drive motor. A detecting unit for detecting the upper limit position and the lower limit position of the loop, a time measuring unit for measuring the time for the coil material to reach the lower limit position from the upper limit position of the loop, and the coil material reaching the lower limit position from the upper limit position of the loop A time setting unit that sets a target time, and when the coil material reaches the upper limit position or lower limit position of the loop, the operation and stop of the driving motor of the mandrel are switched, and the target time and time measurement set by the time setting unit are switched. In a mandrel control device having a control unit that compares the measurement time of the unit and increases or decreases the rotational speed of the drive motor by a predetermined rotational speed,
The control device further includes
A frequency domain setting unit that sets the operating frequency range of the drive motor as a plurality of frequency domains;
A frequency setting unit for setting a steady operation frequency of the drive motor;
The target time is set according to which of the plurality of frequency regions set by the frequency region setting unit is the steady operating frequency of the drive motor set by the frequency setting unit. Control device.   2. The mandrel control device according to claim 1, wherein the drive motor is inverter-controlled, and the steady operation frequency is increased or decreased by comparing the target time and the measurement time. The control device sets a change rate of an operation frequency corresponding to the frequency setting region, a change rate setting unit,
Storage means for storing a steady operation frequency of the drive motor;
A calculation means for comparing the steady operation frequency stored in the storage means and a reference value of the frequency region;
3. The mandrel control device according to claim 1, wherein a change rate and a target time of an operation frequency at the next operation are selected based on the comparison result.   The rotation number of the drive motor is increased by a predetermined number of rotations every predetermined time until a stop signal is input when a stop signal is not input within a predetermined time after the target time has elapsed. The mandrel control device according to any one of claims 1 to 3.

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