JP5463731B2 - Constant welding current control timer - Google Patents

Description

  The present invention relates to a timer used for constant welding current control.

  In general, the constant welding current control timer is used to control the welding control circuit by inputting welding conditions such as the specified welding current value from the teach pendant, the turns ratio of the specified welding transformer, the applied pressure, and the energizing time. It is.

  The welding current is calculated as a primary current value from a specified welding current value and a turns ratio of the specified welding transformer in a timer, and a constant welding current is obtained by supplying the primary current calculated to the welding control circuit. I am doing so.

  However, in the welding control circuit, there are power losses in the primary side circuit, the welding transformer, and the secondary side circuit, respectively, and it is difficult to obtain the predetermined welding current.

  Therefore, conventionally, in a timer used for constant welding current control, a welding operation such as a designated welding current value, a turns ratio of a designated welding transformer, a pressurizing force, and an energizing time is input from a teach pendant, and the control operation is performed. Test energization is performed by the primary current value calculated from the specified welding current value and the turns ratio of the specified welding transformer, and the primary current is adjusted so that the secondary current value obtained by the energization approaches the specified welding current value. The turn ratio of the welding transformer obtained by comparing and calculating the detected primary side current value and secondary side current value in the timer is held in the timer, and the teaching pendant The timer has a function to change the turns ratio of the correction welding transformer in place of the turns ratio of the specified welding transformer, and this turns ratio of the correction welding transformer is set in the timer during line operation. The power loss cover by the turns ratio - the effective welding current was. Also, the turn ratio of each correction welding transformer by each test energization corresponding to the magnitude of the specified welding current value from the teach pendant is stored in the timer, and the number of turns of the correction welding transformer during line operation from the specified welding current value There is a timer used for constant welding current control in which a function for selecting a ratio is also provided in the timer (see, for example, Patent Document 1).

JP 2008-126234 A.

  By the way, in the timer of the prior art, since the object of correction is the turns ratio of the welding transformer, the primary current value detected at that time after the secondary current value is brought close to the designated welding current value by test energization and Since the secondary current value is compared and calculated in the timer to determine the turn ratio of the correction welding transformer, the detection and comparison calculation is not simple, takes excessive time, is troublesome, and is corrected. The ratio is specified to one digit after the decimal point and cannot be finely adjusted, and there is a problem that an effective welding current is likely to have an error when the line is operated using the corrected turns ratio of the welding transformer.

The present invention has been made in view of such problems of the prior art, and the object of the present invention is to make the correction target a designated welding current value from a teach pendant and at the time of the test. It is an object of the present invention to provide a constant welding current control timer capable of obtaining an accurate effective welding current at the time of line operation, with a simple operation for communication of a welding current value to a timer, a simple comparison operation, and without requiring time.

In order to achieve the above object, the constant welding current control timer according to the present invention inputs a welding condition such as a designated welding current value from a teach pendant, a turns ratio of a designated welding transformer, a pressurizing force, and an energizing time. The secondary side current value that was energized by the test using the primary current value calculated from the specified welding current value from the teach pendant and the turns ratio of the designated welding transformer was provided during the test energization. detected by the reference welding current meter, said detected secondary current value and the Ti - comparing the specified welding current value from the Chi pendant suspends the error value in the timer, and the Ti - Chi pendant function wherein by adding the error value to specify the welding current value and the correction current value from the imparted into the timer, and characterized in that the specified welding current value in the said time correction current line operation timer That is intended.

Further, the Ti - the error value and the error ratio is stored in the timer by each test welding current value corresponding to the magnitude of the specified welding current value from the Chi pendant line operation from the test welding current value during testing energized The timer also has a function of selecting a designated welding current value at the time.

Further, the Ti - in timer that turns ratio specified welding current value and the welding transformer from Chi pendant is input, the previously a secondary side current value by a test current under the same conditions Thi - specified welding from Ji pendant for those error value of the current value is stored, the Ti - was also given in the timer function of the correction current value by adding the error value that is the stored in the designated welding current value from the Chi pendant The correction current value is used as a designated welding current value in a timer during line operation.

Furthermore, the Ti - in timer that turns ratio specified welding current value and the welding transformer from Chi pendant is input, already the tee and the secondary-side current value by a test current - the specified welding current value from the Chi Pendant For the specified welding current value other than the specified welding current value from the teach pendant in which the error value and the error ratio are stored, the test energization immediately above and below the specified welding current value from the teach pendant was performed. The timer also has a function of calculating the specified welding current value from the teach pendant from the error ratio in the specified welding current value from both teach pendants and making it a correction current value. The specified welding current value in the timer during line operation is used.

  The invention according to claim 1 is a constant welding current control timer in which an error value can be stored without requiring time by a simple operation during test energization, and an accurate welding current can be obtained during line operation.

In the invention according to claim 2, the teach pendant is further stored by storing in the timer an error value and an error ratio according to each test welding current value corresponding to the magnitude of the designated welding current value from the teach pendant. This is a constant welding current control timer that can be generalized where the welding current value at the time of line operation can be easily selected regardless of the magnitude of the designated welding current value from .

In the invention according to claim 3, the secondary current value and the tee are already set by the test energization under the same conditions in the timer in which the designated welding current value from the teach pendant and the turns ratio of the welding transformer are input. for those error values for the specified welding current value from the Chi pendant is stored, skip test current, Thi - corrected by adding an error value that is the stored in the designated welding current value from the Chi pendant This is a constant welding current control timer in which the adjustment operation is speeded by setting the current value as the specified welding current value in the timer during line operation.

In the invention according to claim 4, the secondary side current value and the teach pendant are already supplied by the test energization in the timer in which the designated welding current value from the teach pendant and the turns ratio of the welding transformer are input . For the specified welding current value other than the specified welding current value in which the error value and error ratio of the specified welding current value are stored, the test energization is omitted and the specified welding current value from the teach pendant The timer also has a function to calculate the specified welding current value from the error ratio in the specified welding current value from both teach pendants energized by the test and to make it a correction current value. This is a constant welding current control timer in which the adjustment operation is speeded by setting the specified welding current value in the timer.

It is circuit structure explanatory drawing of the constant welding current control suitable for implementing the timer for constant welding current control which concerns on this invention. 3 is a flowchart of a constant welding current control timer according to the present invention during test energization. It is a schematic block diagram of the constant welding current control timer according to the present invention.

A timer that controls the welding operation by inputting welding conditions such as the specified welding current value from the teach pendant, the turns ratio of the specified welding transformer, pressurizing force, energizing time, etc. The specified welding current value from the teach pendant The secondary current value energized by the test with the primary current value calculated from the turns ratio of the designated welding transformer is detected by a reference welding ammeter provided at the time of energizing the test , and the detected secondary current value and the tee are detected. -A function that compares the specified welding current value from the pendant and holds the error value in the timer, and adds the error value to the specified welding current value from the teach pendant to obtain a corrected current value. the imparted into the timer, the constant welding current control timer to the said correction current value with the specified welding current value in the timer during line operation.

  A constant welding current control timer according to the present invention will be described in detail with reference to the accompanying drawings. 1 to 3, 1 is a primary circuit of a constant welding current control circuit, 2 is a welding transformer, 3 is a secondary circuit, and the primary circuit 1 is connected to a power source 4 and a welding transformer 2, The side circuit 3 is connected to the welding transformer 2 and the welding machine 5.

  The primary side circuit 1 is provided with a semiconductor element 6 and a current sensor 7 made of, for example, a bidirectional thyristor, and the primary side current detected by the current sensor 7 is transmitted to the CPU via the A / D converter 8. The control signal from the timer 9 is sent to the semiconductor element 6 via the communication control unit 10 comprising an ignition circuit to control the primary side current.

  11 is a teach pendant. The teach pendant 11 stores data of welding conditions such as a designated welding current value, a turns ratio of a designated welding transformer, a pressurizing force, and an energizing time. Necessary data is input to the timer 9 from the teach pendant 11.

  Reference numeral 12 denotes an ammeter sensor that is disposed in the secondary circuit 3 only during test energization, which will be described later. A reference welding ammeter 13 connected to the ammeter sensor 12 is a welding current during test energization. The value is communicated to the timer 9 or the teach pendant 11.

  In the timer 9, the designated welding current value instructed from the teach pendant 11 is compared with the welding current value from the reference welding ammeter 13, and the error value is held in the timer 9, and A function of adding the error value to the designated welding current value from the teach pendant 11 to obtain a corrected current value is provided.

  Before the welding machine 5 enters line operation, it is necessary to adjust so that the electric power supplied to the welding machine 5 is accurately controlled. Test energization for that purpose will be described in detail with reference to FIG.

  In the “energization process” of step S1, the welding machine 5 is in a pressurized state for test energization, the ammeter sensor 12 is arranged in the secondary circuit 3, and the reference welding current connected to the ammeter sensor 12 is connected. The total 13 is made readable, while the primary side current value calculated in the timer 9 from the designated welding current value designated from the teach pendant 11 and the turns ratio of the designated welding transformer is passed through the energization control 10. The primary side circuit 1 is supplied.

  In “in correction mode” of step S2, it is determined whether or not the apparatus is in the correction mode. If not in the correction mode, the current is supplied to the primary side circuit 1 directly to “End”. And the welding machine 5 is opened. If the apparatus is in the correction mode, the process proceeds to the next step S3.

  In “ammeter information reception” in step S3, the information of the reference welding ammeter 13 obtained by reading the detection of the welding current from the ammeter sensor 12 in the secondary circuit 3 can be simply pressed, for example, by pressing an attached button. The timer 9 receives the welding current value in the secondary side circuit 3.

In step S4 "designated welding current value when energized and comparison process", the designated welding current value from the teach pendant 11 and the welding current value in the secondary side circuit 3 received by the timer 9 are set to the timer 9; The error value is added to the designated welding current value from the teach pendant 11 to obtain a corrected current value.

  In step S5 “store error value internally”, the error value is stored in the timer 9.

  In FIG. 3, SIO 92, SIO 93, EEPROM 94, ROM 95, RAM 96, PIO 97, etc. are connected to the CPU 91 that is the main part of the timer 9.

SIO 92 is a communication port for receiving the information of the reference welding ammeter 13 in step S3, and SIO 93 is a communication port for receiving the designated welding current value from the teach pendant 11. Yes, the CPU 91 can send a signal corresponding to the designated welding current value from the teach pendant 11 of the SIO 93 to the semiconductor element 6 via the energization control unit 10 to control the primary side current, and the SIO 92 The welding current value received in step S10 is compared with the designated welding current value from the teach pendant 11 of the SIO 93, and the error value is stored in the EEPROM 94.

When the line is in operation, the CPU 91 adds an error value stored in the EEPROM 94 to the designated welding current value from the teach pendant 11 of the SIO 93 to obtain a corrected current value, and the corrected current value and the number of turns of the designated welding transformer. The primary current value calculated by the CPU 91 from the ratio is supplied to the primary circuit 1 of the welding control circuit.

  In FIG. 3, the ROM 95 stores a fixed program and fixed data for welding control, the RAM 96 stores an operation command and the like, and the PIO 97 controls a data transfer system. Since it is generally used for normal welding control, its detailed description is omitted.

In the present invention, since the secondary current value obtained by the test energization is a value obtained by subtracting the power loss in the welding control circuit, the corrected current value is used instead of the designated welding current value from the teach pendant 11. Is the welding current value when the line is operating, the power loss is covered and an accurate effective welding current is obtained for welding in the welding machine 5. The error value can be stored in the timer 9 with a simple operation using a simple operation, and the error value is added to the designated welding current value from the teach pendant 11 in the timer 9 when the line is in operation. Thus, the correction current value can be simply set.

Then, by using the reference welding ammeter 13 provided at the time of test energization, the designated welding current value from the teach pendant 11 of each timer 9 used in the line is matched with the value of this reference welding ammeter 13. Therefore, it is possible to perform the welding work with the designated welding current value in the timer 9 at the time of high- precision line operation in which the variation (error, machine difference) of the current value of each timer 9 is corrected and the entire line is aligned. It becomes possible.

  The constant welding current control based on the primary feedback has been described above. However, in the case of the constant welding current control based on the secondary feedback, the current sensor 7 in the primary side circuit 1 in FIG. Instead of this, the current sensor 14 may be installed in the secondary circuit 3. Further, although the AC circuit is described in the drawing, it can be applied to a DC or inverter welding control device.

  In the constant welding current control timer described in the first embodiment, the welding machine 5 may normally use welding currents of various values from 5000 A to 15000 A. Therefore, the timer 9 has a function that can respond promptly. It is what you have.

Therefore, test energization is performed for the designated welding current value from each teach pendant 11 in accordance with the magnitude of the designated welding current value from the teach pendant 11, and the error value due to each test welding current value and All the error ratios are stored and accumulated in the timer 9 in step S5, and the designated welding current value during line operation is selected from the test welding current value during test energization.

  By providing the timer 9 with such a function, it is possible to easily generalize the welding current value at the time of line operation regardless of the magnitude of the designated welding current value from the teach pendant 11. It can be done.

In the constant welding current control timer described in the second embodiment, the timer 9 to which the designated welding current value from the teach pendant 11 and the winding ratio of the welding transformer are input is already applied by the test energization under the same conditions. side current value and the tee - there is a case where an error value of the specified welding current value from the Chi pendant 11 is stored, it functions as promptly cope those which gave the timer 9.

Therefore, in the timer 9 to which the designated welding current value from the teach pendant 11 and the turns ratio of the welding transformer are input, the secondary side current value and the designated welding from the teach pendant 11 have already been obtained under the same test conditions. since there is a case where the error value of the current value is stored, in which case is obtained so as to execute using line running said error value without test energization.

By having the timer 9 is also such a function, skip test current, Thi - a correction current value by adding the error value that is the stored in the designated welding current value from the Chi pendant 11, this The adjustment operation is speeded by setting the correction current value to the designated welding current value in the timer 9 when the line is operating.

In the constant welding current control timer described in the second embodiment, the secondary current value by the test energization is still inputted to the timer 9 to which the designated welding current value from the teach pendant 11 and the turns ratio of the welding transformer are input. The error value and error ratio of the designated welding current value from the teach pendant 11 may not be stored. In this case, the timer 9 is also provided with a function that can respond promptly.

Therefore, in the timer 9 to which the designated welding current value from the teach pendant 11 and the turns ratio of the welding transformer are input, an error between the secondary current value and the designated welding current value from the teach pendant 11 has already been caused by test energization. For the specified welding current value other than the specified welding current value from the teach pendant 11 in which the value and the error ratio are stored, the test energization immediately above and below the specified welding current value from the teach pendant 11 was performed. The timer 9 also has a function of calculating a specified welding current value from the teach pendant 11 from the error ratio in the specified welding current value from both teach pendants 11 to obtain a corrected current value. The value is the designated welding current value in the timer 9 when the line is operating.

For example, the error ratio 4% is stored in the timer 9 at the specified welding current value 10000A from the teach pendant 11, and the error ratio 4.6% is stored at the specified welding current value 10500A from the teach pendant 11. When the specified welding current value 10200A from the teach pendant 11 is specified, the error ratio is 4.24% and the error value is 433A in the calculation in the timer 9 without conducting the test energization. Further, the correction current value is 10633A.

By providing the timer 9 with such a function, the test energization is omitted, and a correction current value corresponding to the designated welding current value from the teach pendant 11 is obtained. By adjusting to the designated welding current value in the timer 9 , the adjustment operation is speeded up.

9 Timer 11 Teach pendant 12 Sensor for ammeter when test is energized 13 Reference welding ammeter

Claims (4)

In a timer used for constant welding current control based on primary or secondary feedback, input welding conditions such as the specified welding current value from the teach pendant, the turns ratio of the specified welding transformer, the applied pressure, and the energizing time. The secondary side current value that was energized by the test using the primary current value calculated from the specified welding current value from the teach pendant and the turns ratio of the designated welding transformer was provided during the test energization. detected by the reference welding current meter, said detected secondary current value and the Ti - comparing the specified welding current value from the Chi pendant suspends the error value in the timer, and the Ti - Chi pendant function wherein by adding the error value to specify the welding current value and the correction current value from the imparted into the timer, and the said corrected current value and the specified welding current value in the timer during line operation Constant welding current control timer, wherein the door. The Tea - an error value and the error ratio is stored in the timer by each test welding current value corresponding to the magnitude of the specified welding current value from the Chi pendant from the test welding current value during testing energized during line operation 2. The constant welding current control timer according to claim 1, wherein the timer also has a function of selecting a designated welding current value. In the timer to which the specified welding current value from the teach pendant and the turns ratio of the welding transformer are input, the secondary side current value and the specified welding current value from the teach pendant have already been tested under the same conditions. for those error value is stored, the Ti - imparted to the timer is also a function of the correction current value by adding the error value to specify the welding current value is the storage from Ji pendant, this 3. The constant welding current control timer according to claim 2, wherein the correction current value is a designated welding current value in the timer during line operation. In the timer in which the specified welding current value from the teach pendant and the turns ratio of the welding transformer are input, the error value between the secondary side current value and the specified welding current value from the teach pendant has already been obtained by test energization. For the specified welding current value other than the specified welding current value from the teach pendant in which the error ratio is stored, both test energized tees immediately above and below the specified welding current value from the teach pendant. The timer also has a function to calculate the specified welding current value from the teach pendant from the error ratio in the specified welding current value from the tip pendant and use it as a correction current value. 3. The constant welding current control timer according to claim 2, wherein the specified welding current value is within the timer.