WO2010001603A1

WO2010001603A1 - Zero point setting-based workpiece welding control method and workpiece welding control device

Info

Publication number: WO2010001603A1
Application number: PCT/JP2009/003051
Authority: WO
Inventors: 日高勝人
Original assignee: 株式会社エスエムケイ
Priority date: 2008-07-04
Filing date: 2009-07-01
Publication date: 2010-01-07
Also published as: CN102123816A; JP4656593B2; JP2010137280A; CN102123816B; WO2010001603A4

Abstract

Disclosed is a zero point setting-based workpiece welding control method that enables greater machining precision, that enables the control of machine tool wear, loosening and damage and so on, and that enables the efficient implementation of zero point setting. During a welding process which involves setting a plate-shaped workpiece (W) and a nut (N) on a positioning pin (8) projecting upward through a through-hole (5h) of a lower electrode (5), pressing the nut (N) from above to set the zero point of the positioning pin (8), and determining abnormality of the position of the nut (N) and abnormality of the equipment and so on in accordance with this zero point, a cycle comprising a sequence of setting the workpiece on the lower electrode (5), lowering the upper electrode (5), compressing the workpiece, (applying an electric current), and releasing the compression is automatically performed. The zero point is able to be automatically measured and set during this cycle when the position of the workpiece conforms with the standard position.

Description

Work welding management method and work welding management device based on zero point setting

The present invention relates to a welding management technique for workpieces suitable for welding parts such as nuts and bolts with a processing tool.

Conventionally, when machining a workpiece, in order to keep the machining conditions constant, the workpiece reference position at the machining origin is set as a zero point, a predetermined tolerance range is set for this zero point, and within this tolerance range In general, a method of machining after confirming the condition is performed. At this time, when the machining conditions change over time according to the machining, the machining is performed while correcting the zero point. Technology is also known. (For example, see Patent Documents 1 and 2.)
On the other hand, as a technique for projection welding of nuts and bolts to steel plates, etc., the present applicant positions welding parts such as nuts on a perforated steel plate with positioning pins that can be moved up and down by the operation of an air cylinder, and the upper electrode and lower As a technique of welding with energizing steel plates and nuts with electrodes and applying pressure and energization, both rods are used to determine that the posture of the nuts and bolts is normal by detecting the amount of vertical stroke of the positioning pin. A technique (for example, see Patent Document 3) in which a type of cylinder unit is used and a detection mechanism for detecting the extension stroke of the cylinder rod is provided on the cylinder unit is proposed.

JP-A-7-116899 JP 2006-247679 A Registered Utility Model Publication No. 3135271

However, even though conventional welding management based on zero point setting is effective to some extent in that the machining conditions for the workpiece are kept constant, there is a limit to more precise machining management. In addition to welding management based on the zero point of the workpiece, if it is possible to manage the wear on the processing tool side, loose tightening, breakage, etc., for example, maintenance when the wear on the processing tool side reaches a predetermined range, etc. It was thought that by applying, it was possible to process more precisely and manage welding more precisely.
Furthermore, it would be more convenient if the work for setting the zero point could be performed more efficiently.

Therefore, the present invention makes it possible to manage the welding more precisely in the welding management based on the zero point setting, and also to manage the wear on the processing tool side, loosening and breakage of tightening, and the zero point setting work. The purpose is to make it more efficient.

To achieve the above object, according to the present invention, in setting the zero point, in the zero point setting mode, the workpiece is set on the lower electrode, the upper electrode is lowered, the workpiece is pressurized and applied by the upper electrode. When automatically performing a series of zero release cycles for pressure release, in the operation mode, the workpiece is set on the lower electrode, the upper electrode is lowered, the workpiece is pressurized by the upper electrode, energized, and the pressure is released. When the series of welding cycles was automatically performed, the zero point was automatically measured and set when the workpiece reached the reference position.

That is, as a method of setting the zero point, after setting the work on the lower electrode as in the conventional method, the upper electrode is lowered manually and the basic posture is established by pressing the work. For example, in the zero point setting mode, after setting the work, press the zero point setting switch to lower the lower electrode, pressurize and release the pressure. The zero point setting time is shortened and efficient by automatically measuring and setting the zero point when the basic posture of the workpiece is established during that cycle. Can work on. The zero point can be set by such automation even in the welding cycle of lowering the upper electrode, pressurizing, energizing, and releasing the pressure during the welding operation.

In the present invention, as the zero point, both a processing tool zero point based on a reference processing tool and a work zero point based on a reference work are set, and the work zero point is based on the first reference work. A standard workpiece zero point set based on an average value of zero points of a plurality of workpieces during a series of machining, and the machining tool zero point and the standard workpiece zero point Or any combination of the processing tool zero point and the average workpiece zero point so that welding cannot be performed if the allowable range of the two zero points of each combination is not satisfied. In addition to welding control, the zero point is set based on the description of claim 1.

In this way, it is possible to arbitrarily select either the combination of the processing tool zero point and the reference work zero point or the combination of the processing tool zero point and the average work zero point. By managing the welding so that welding is not possible when the allowable range is not satisfied, for example, it is possible not only to detect and manage defects caused by workpiece errors, but also to detect and manage defects caused by wear on the work tool side. It is possible to control the machining more accurately, and one of the two combinations can be selected arbitrarily. For example, when the welding conditions change over time, the zero point of the tool and the average workpiece If a combination of zero points is used and there is no significant change in welding conditions, a combination of the zero point of the workpiece and the reference workpiece zero point may be used. , It will be able to better manage.
Here, it is preferable that the number of workpieces for setting the average workpiece zero point can be arbitrarily set.

According to the present invention, in the welding management method in which the zero point and a predetermined allowable value range with respect to the zero point are set to perform welding management of the workpiece, the zero point is a processing tool zero point based on a reference processing tool. And a workpiece zero point based on the reference workpiece, and for this workpiece zero point, a reference workpiece zero point set based on the first reference workpiece and a plurality of workpieces during a series of machining operations. Provide an average workpiece zero point that is set based on the average value of the zero point, and if it does not satisfy the allowable range of the two zero points of the processing tool zero point and the reference workpiece zero point, it is controlled so that welding is not possible and the number of times At the time of welding, the value of the reference workpiece zero point is replaced with the value of the average workpiece zero point, and welding management is performed, and the setting of the zero point is based on the description of claim 1.

That is, as a first specific example of such a method, for example, when an average value of 10 times is adopted as the average work zero point, welding up to the first 10 times is performed between the work tool zero point and the reference work zero point. At the same time, the work zero point of each time is measured and the average is obtained and the average value of the obtained average work zero point is replaced with the value of the reference work zero point at the next eleventh time. While managing with two combinations of the reference workpiece zero point replaced with the tool zero point, welding was performed from the 11th to the 20th time, and during this time, the workpiece zero point was measured again to obtain the average, and the next 21st time Is a method of replacing the newly obtained average workpiece zero point value with the reference workpiece zero point and repeating this continuously.

Further, as a second specific example, for example, when an average value of 10 times is adopted as an average workpiece zero point, for example, the first 100 machining operations are managed by two combinations of a machining tool zero point and a reference workpiece zero point. At the same time, the average workpiece zero point is obtained at a predetermined timing during this period, and the 101st time, the average workpiece zero point value obtained in the above manner is replaced with the reference workpiece zero point value, and the next 101 to 200 times. This is a method in which welding is controlled, and at the same time, an average workpiece zero point is obtained at a predetermined time in the meantime and this is repeated.

It should be noted that other methods can be considered as a method of replacing the value of the average workpiece zero point with the value of the reference workpiece zero point, but it is possible to manage more practically by performing such replacement.

According to the present invention, in the welding management apparatus for a workpiece having a zero point setting mechanism capable of setting a zero point and a predetermined allowable value range for the zero point, the zero point setting mechanism is in a zero point setting mode. In the operation mode, when a series of zero-point setting cycles of workpiece setting on the lower electrode, lowering of the upper electrode, pressurization of the workpiece by the upper electrode, and pressure release are automatically performed, When performing a series of welding cycles such as setting a workpiece on the electrode, lowering the upper electrode, pressurizing the workpiece with the upper electrode, energizing, and releasing the pressure automatically, the workpiece is automatically set to the reference position. Added a function to measure and set the zero point.
And if a zero point is set by the method of Claim 1, it can work efficiently.

In the present invention, the zero point setting mechanism includes a processing tool zero point setting mechanism for setting a processing tool zero point based on a reference processing tool and an allowable value range thereof, a reference zero point based on an initial reference work, and A reference workpiece zero point setting mechanism for setting the allowable value range, and an average workpiece zero point set based on the average value of the zero points of a plurality of workpieces during a series of machining and the allowable value range are set. An average workpiece zero point setting mechanism is provided.
By doing so, the welding management method as in claim 2 can be easily performed.

In the present invention, the average work zero point setting mechanism can arbitrarily set the number of times for obtaining the average, the timing for obtaining the average, and the like in the control box.

By giving such a function to the average workpiece zero point, it is possible to operate more practically, particularly when managing with a combination of the machining tool zero point and the average workpiece zero point.
The number of times for obtaining the average, the timing for obtaining the average, and the like can be arbitrarily set. For example, when the welding cycle is repeated continuously from the first time to the 100th time, the average value of the zero points is obtained. The number of workpieces and the time, for example, the first to the tenth workpiece, the tenth to the thirty workpiece, the workpiece is in a continuous cycle, or every other workpiece It is possible to set such things arbitrarily with the control box.

In the present invention, the processing speed for setting the zero point of the software incorporated in the CPU for setting each zero point is set to be within one second.
Thus, by making it within 1 second, the zero point setting cycle in the zero point setting mode automatically performed and the welding cycle in the operation mode can be efficiently performed, and the cycle time is shortened.

In the welding management method for welding management of workpieces based on the zero point setting, when setting the zero point, in the zero point setting mode, the workpiece is set on the lower electrode, the upper electrode is lowered, the workpiece by the upper electrode is When automatically performing a series of zero point setting cycles of pressurization and release of pressure, in operation mode, the workpiece is set on the lower electrode, the upper electrode is lowered, the workpiece is pressurized by the upper electrode, When performing a series of welding cycles of energization and pressure release automatically, the zero point is automatically measured and set when the workpiece reaches the reference position, thereby reducing the time for setting the zero point. And can work efficiently.

Also, as the zero point, set the work tool zero point based on the reference work tool and the work zero point based on the reference work, and as the work zero point, the reference work zero point set based on the first reference work An average workpiece zero point that is set based on the average value of the zero points of multiple workpieces is set during a series of machining, and a combination of the machining tool zero point and the standard workpiece zero point, or the machining tool zero point and the average workpiece zero If any one of the combinations of points can be selected arbitrarily and welding management is performed within the allowable range of the two zero points of each combination, welding management can be performed while maintaining the processing tool in an appropriate state. Even when the processing conditions change over time, it can be appropriately managed.

In addition to managing based on the two zero points of the processing tool zero point and the reference workpiece zero point, and if welding management is performed by replacing the value of the reference workpiece zero point with the value of the average workpiece zero point when welding is performed as appropriate, It can be managed more practically.
In addition, it is more practical by arbitrarily setting the average workpiece zero point setting mechanism for the average number of times and the timing for determining the average, and the software processing time for zero point setting The cycle time can be shortened by keeping the value within a predetermined time.

Overall configuration diagram of a component welding apparatus to which a welding management apparatus according to the present invention is applied Explanatory drawing for explaining the zero point of the positioning pin Explanatory drawing of welding management device Flow chart when setting each function of this welding management device

Embodiments of the present invention will be described with reference to the accompanying drawings.
Here, FIG. 1 is a schematic configuration diagram of the whole component welding apparatus according to the present invention, FIG. 2 is an explanatory diagram for explaining a zero point of a positioning pin, FIG. 3 is an explanatory diagram of a welding management apparatus, and FIG. It is a flowchart at the time of each function setting of an apparatus.

The welding management device according to the present invention is applied as a device for managing a component welding device, and this component welding device is configured as a device for welding a nut or a bolt to a steel plate or the like. This welding device detects abnormalities in the posture of workpieces such as bolts and nuts during welding and abnormalities such as wear and breakage of the electrodes on the work tool side, and interrupts the welding operation when abnormalities are detected. ing. First, an outline of this welding apparatus will be described.

As shown in FIG. 1, the welding apparatus 1 includes a double rod type air cylinder unit cylinder 2 and an electrode holder having a double cylinder structure connected to an upper portion of a cylinder 2 s of the air cylinder unit 2 via an insulating material 3. 4 and a lower electrode 5 coupled to the upper end of the electrode holder 4 and having a through hole 5h at the center, and an insulating joint is provided at the upper end of the upper cylinder rod 2r extending upward from the cylinder 2s. A connecting shaft 7 is connected via 6, and a positioning pin 8 is detachably attached to an upper portion of the connecting shaft 7. The upper cylinder rod 2r, the connecting shaft 7, and the positioning pin 8 are movable up and down in the cylinder of the electrode holder 4, and the positioning pin 8 is protruded and retracted from the through hole 5h of the lower electrode 5. Yes.

And in order to detect the raising / lowering stroke of this positioning pin 8, the stroke detection mechanism 10 is provided under the cylinder 2s, and this stroke detection mechanism 10 is the lower end part of the cylinder rod 2r extended below from the cylinder 2s. A connecting plate 12 connected to the connecting plate 12, a guide rod 13 connected to one end of the connecting plate 12, and a sensor rod 14 connected to the other end of the connecting plate 12. The guide rod 13 is fixed. The guide rod 16 disposed on the plate 15 penetrates slidably, and the sensor rod 14 is slidably inserted into the sensor tube 17 disposed on the fixed plate 15. The amount of movement of the sensor rod 14 can be detected by the sensor cylinder 17, and the stroke detection amount detected by the sensor cylinder 17 is sent to a control box 20 as a processing management apparatus described below.

Therefore, before explaining the details of the control box 20, first, the procedure for setting the zero point during welding will be described with reference to FIG.

As shown in FIG. 2A, after the positioning pin 8 is protruded upward from the through hole 5h by the air cylinder unit 2, a pilot hole h for inserting a bolt is formed on the lower electrode 5. A plate-like workpiece W such as a steel plate is set so as to be fitted into the positioning pin 8, and thereafter, a nut N is set on the positioning pin 8 from above.
At this time, when the nut N is in a normal posture, the projection part p (part melted by welding) is positioned below, and a gap is formed between the projection part p and the plate-like workpiece W. It is trying to become.
Incidentally, the projection amount α by which the projection part p projects downward from the lower surface of the nut N is about 0.7 mm.

Next, as shown in FIG. 2B, the upper electrode 11 descends from above, and the nut N is pressed against the plate-like workpiece W while pressing the upper surface of the nut N downward. At this time, the force that pushes the positioning pin 8 upward by the lower air cylinder unit 2 is weaker than the pressing force by which the upper electrode 11 presses the nut N downward, so as shown in FIG. The nut N is pushed down and lowered, the positioning pin 8 biased upward is also lowered together, and the projection portion p of the nut N abuts on the plate-like workpiece W. The position of the positioning pin 8 at this time is measured by the stroke detection mechanism 10 and set as a zero point by the control box 20.

Further, in the conventional setting of such a zero point, after the plate-like workpiece W and the nut N are set on the lower electrode 5, the upper electrode 11 is lowered from above by operating a switch or the like, and the upper electrode 11 and the lower electrode 5 and pressurizing with a predetermined pressure. When the state shown in FIG. 2B is reached, the position of the positioning pin 8 is measured by the stroke detection mechanism 10 and set as a zero point, and then a switch or the like In general, in the present invention, in the zero point setting mode, the lowering of the upper electrode 11 can be performed by pressing a switch as described later once. The zero point setting cycle for pressurizing and releasing the workpiece is automatically performed, and the zero point can be automatically measured and set during that cycle.

Further, in the present invention, the zero point can be set not only in the zero point setting mode but also in the operation mode in which actual welding is performed. In this case, after the work is set, the upper electrode 11 is lowered. A series of welding cycles of pressurizing, energizing and releasing the work are automatically performed, and the zero point can be automatically measured and set during that time.

At this time, in this embodiment, the upper electrode 11, the lower electrode 5, the positioning pin 8 and the like correspond to the “processing tool”, and the nut N and the plate-shaped workpiece W correspond to the “work”. When processing the second time, set a normal nut N or plate-like workpiece W, and the first workpiece is set as the reference workpiece zero point. When dressing maintenance is performed, the first zero point immediately after replacement is the processing tool zero point.

That is, when the upper electrode 11 presses the upper surface of the nut N downward while pressing the nut N against the plate-like workpiece W, the processing tool zero point is obtained when the plate-like workpiece W is a thin plate material. The protrusion of p presses the lower electrode 5 locally through the plate-like workpiece W, and when this is repeated, the lower electrode 5 is locally worn. Therefore, when the wear degree of the lower electrode 5 reaches a predetermined range, It becomes necessary to carry out maintenance such as cutting and flattening, and the zero point will be affected. In addition, the fitting portion of the positioning pin 8 with the nut N is worn out. For this reason, it is desirable to manage the side of the processing tool such as the wear of the lower electrode 5, the wear of the positioning pin 8, and the looseness of the mounting portion of the lower electrode 5 as the processing proceeds. For this reason, in the present invention, the processing tool zero point is set and managed.

Further, when the welding operation is repeated, for example, when the sensor inside the sensor cylinder 17 that detects the raising / lowering stroke of the positioning pin 8 is subject to a change in temperature, the measured value changes. Since the rod 14 is affected by the temperature, it is not preferable to maintain the initially set zero point because the error becomes large. In such a case, it is preferable to improve accuracy by using the nearest zero point.

For this reason, in this embodiment, the zero point is measured every time the actual welding operation is performed, and the average value of the zero point of the predetermined number of works is obtained and managed based on this. The average workpiece zero point is sometimes set.
That is, in the present invention, when welding is performed in the operation mode, the stroke amount is detected by the stroke detection mechanism 10 every time a welding operation is performed, and this is transmitted to the control box 20 for storage.

The control box 20 incorporates software for performing zero setting inside and managing welding processing based on the zero setting, and as shown in FIG. 3, an NG light and an OK light are provided at the uppermost stage. A channel indicator 21 and a channel mode key 22 are provided at the upper part of the lower front panel, a + allowable value indicator 23 and a + allowable value mode key 24 are provided at the lower part thereof, and a −allowable value indicator 25 is provided at the lower part thereof. And a -tolerance mode key 26 is provided. A determination timer / measurement value display 27 and a determination timer / measurement value mode key 28 are provided at the lower stage, and a − key 29, a + key 30 and an enter key 31 are provided at the lower stage. In the lower stage, an error reset key 32 and a zero position key 33 are provided.

Note that a RUN / DATA changeover switch (not shown) for switching the control box 20 to the operation mode or the data setting mode is provided on the rear panel of the control box 20.

The functions of the front panel switches and the like will be briefly described. The channel mode key 22 is selected in accordance with the work model, and the channel display 21 displays the selected work model. . Further, by pressing the + allowable value mode key 24 and the −allowable value mode key 26, the + allowable value setting mode or the −allowable value setting mode can be entered. By pressing 29, the set value can be increased or decreased. The set value is displayed on the + allowable value display 23 and the −allowable value display 25.
The determination timer / measurement value mode key 28 is used to switch the display mode of the determination timer / measurement value display 27. Each time the determination timer / measurement value mode key 28 is pressed, a determination timer (time from completion of nut supply until nut determination is performed) is displayed and measured. Switches to the value display.

The enter key 31 is a key for determining the zero point, and the error reset key 32 is used when canceling an error such as a nut abnormality, and also when canceling the input of a set value. The zero position key 33 is a key for setting a reference work zero point, and can be set to a setting mode by long pressing.
In addition, when the allowable range of each zero point is out, in any case, at the same time, an NG light and an alarm sound are notified, and at the same time, the determination timer / measurement value display 25 is used to determine which zero point is out of the allowable range. You can see it if you look at it.

In such a control box 20, by setting the rear panel RUN / DATA selector switch to DATA, the setting of the zero tolerance of the processing tool zero point for managing the reference of the lower electrode, and the first machining of the workpiece are performed. It is possible to set the ± allowable value of the reference workpiece zero point that is set occasionally, and the ± allowable value of the average workpiece zero point that is set based on the average value of the predetermined number of machining operations. The RUN / DATA selector switch on the rear panel By switching (not shown) to RUN, it is possible to shift to the operation mode.

Here, the zero point setting procedure will be explained. The zero point setting mechanism is a zero point setting mode in which the zero point is measured and set only without welding work, and an operation in which the zero point can be set simultaneously while performing the welding work. Has a mode. When setting the zero point by conventional manual operation, after setting the work, switch the RUN / DATA selector switch of the control box 20 to DATA, and press the predetermined switch to set the zero point by conventional manual operation. Yes, and when switched to RUN, the operation mode can be entered.
The ± allowable value can be set by pressing the + allowable value mode key 24 or the −allowable value mode key 26.

The zero point can also be set in the operation mode. In this case, the zero point is normally set by pressing the zero position key 33 after setting the reference workpiece. When the start switch of the welding machine is turned on after pressing the zero position key 33, the upper electrode 11 automatically descends, presses the nut N, automatically measures the zero point, and then releases the pressure. Do it automatically. At this time, in this embodiment, when only the zero point is set in the operation mode, the energization on the welding machine side is turned off (this is one of the zero point setting modes), and the zero point is set. When the welding operation is subsequently performed after the setting, the energization on the welding machine side is turned on (this is an operation mode involving the welding operation). The ± allowable value can be set with the + allowable value mode key 24 and the −allowable value mode key 26 as in the above example.
The above-mentioned zero point setting is common to both the processing tool zero point setting and the reference workpiece zero point setting.

Regarding the setting of the average work zero point, a predetermined switch of the control box 20 is turned on to enter the setting mode, and the position of the predetermined switch is changed to leave the setting mode. The ± allowable value can be set with the + allowable value mode key 24 and the −allowable value mode key 26 as in the above example.
Also, regarding the setting of the number of machining times to be set as the average value, if a predetermined switch of the control box 20 is turned on to enter the set mode and set with the-key 29 or the + key 30, the rest is automatically performed. Measure the zero point of a given number of workpieces and calculate the average value.

Regarding an example of the processing flow when using the control box 20 as described above, first, the zero point is measured and set in the zero point setting mode, and when performing welding work, the zero point is measured in the operation mode and averaged. Obtains the workpiece zero point and manages it with two zeros, the work tool zero point and the reference workpiece zero point. When welding is performed as appropriate, the reference workpiece zero point value is replaced with the average workpiece zero point value, and welding management is performed. The case will be described with reference to FIG.

First, set the reference workpiece, and set the reference workpiece zero point and its ± tolerance.
In other words, the RUN / DATA selector switch of the control box 20 is switched to DATA, and a predetermined switch is pressed to enter the zero point setting mode. By pressing the zero position key 33, the upper electrode 11 is automatically moved from above the workpiece. The nut N is lowered and the zero point is automatically measured. The ± allowable value can be set by pressing the + allowable value mode key 24 or the −allowable value mode key 26.

In addition, when the tool side such as the lower electrode 5 or the positioning pin 8 is exchanged in the middle, the processing tool zero point is set in the same procedure as in the case of the reference workpiece zero point, The ± allowable value is set in the same procedure as in the case of the reference workpiece zero point.
In addition, the average workpiece zero point can be arbitrarily set in the control box 20 for the number of machinings based on the average calculation standard. Therefore, if the number of machinings to be averaged is set and the ± allowable value is set, the rest will be automatic. Zero point is set.

When each of the zero points as described above and their ± allowable values are set, the RUN / DATA selector switch on the rear panel of the control box 20 is switched to RUN for operation. At this time, for example, when an average value of 10 times is adopted as the average workpiece zero point, the first ten weldings are managed by two combinations of the processing tool zero point and the first reference workpiece zero point, and at the same time, Measure the work zero point and find the average.

In calculating the average workpiece zero point, in this example, out of the workpiece zero points measured each time, those that deviate from the ± allowable value of the reference workpiece zero point are not included in the average, and are excluded. The average is calculated for those.
In the next eleventh time, the value of the average workpiece zero point is replaced with the value of the reference workpiece zero point, and management is performed based on the two zero points of the reference workpiece zero point replaced with the machining tool zero point again. Welding is performed from the 20th time to the 20th time, and during this time, the workpiece zero point is measured again and the average is obtained. Then, the newly obtained average work zero point value is managed by replacing it with the reference work zero point for the 21st time, and this is continuously repeated.

During this time, the control box 20 is not satisfied with any zero point, except when both the zero point of the processing tool and the reference workpiece zero point are satisfied, and an NG light and an alarm sound are emitted. I will let you know.

An example of setting the ± allowable value will be described. For example, as a result of measuring the height variation of about 10 to 100 workpieces (nuts with projections), the maximum value is 5.795 mm and the minimum value is 5. Assume that the average value is 655 mm and 5.706 mm. In this case, the difference between the maximum value and the minimum value is 0.14 mm, whereas the difference between the maximum value and the average value, and the difference between the minimum value and the average value are +0.089 mm and −0.051 mm, respectively. Since the average workpiece zero point can be managed more precisely than the reference workpiece zero point, when actually setting the allowable value, the tolerance range for the reference workpiece zero point is about ± 0.5 mm, and the average workpiece zero point is The allowable range can be managed at about ± 0.1 mm.
Further, when the standard for polishing the lower electrode 5 is, for example, when an error of ± 2 mm occurs, the allowable range of the processing tool zero point can be set to about ± 2 mm.

In this case, the average workpiece zero point is set and managed, for example, when the detection accuracy of the stroke changes due to the temperature change of the welding machine, etc., and the temperature change etc. increases as the machining progresses, etc. This is because, when the machining conditions change as the machining progresses, the accuracy can be further improved by managing at the average workpiece zero point.

By the way, in the above embodiment, management is basically performed based on two zero points of the processing tool zero point and the reference workpiece zero point, and the value of the reference workpiece zero point is appropriately changed to the average workpiece zero point value at a predetermined timing. We manage the welding by replacing it, but it is also possible to simply manage with two zero points of the tool zero point and the reference zero point, two zero points of the tool zero point and the average workpiece zero point You may make it manage based on. Further, when the value of the reference work zero point is replaced with the value of the average work zero point at an appropriate timing, the replacement timing and the like are also arbitrary.

In this case, in particular, as the average workpiece zero point in the case of two combinations of the machining tool zero point and the reference workpiece zero point, for example, when using the average value of machining from the first time to a predetermined number of times, from the first time As the average workpiece zero point until reaching the predetermined number of times, the average value of all zero points measured during the previous machining may be used sequentially, or the average workpiece zero point after the predetermined number of times may be used. Can be the average value of the zero points measured during the most recent predetermined number of machining operations. By such welding management, for example, when management is performed by a combination of a processing tool zero point and an average workpiece zero point, it is possible to accurately manage.

In the present embodiment, the software processing speed for obtaining the zero point is set to be within one second.
This is because if it takes more time, the time for one welding operation becomes longer, and the cycle time becomes longer when working continuously.

In the welding management as described above, since it is possible to manage the wear of the work tool as well as the workpiece posture and model abnormality, it can be managed more precisely than before.

In addition, this invention is not limited to the above embodiments. What has substantially the same configuration as the matters described in the claims of the present invention and exhibits the same operational effects belongs to the technical scope of the present invention.
For example, the function setting procedure of the control box 20 is an example, and a specific value of ± allowable value is also an example.

When setting the zero point, a series of cycles of lowering the upper electrode, pressurizing the workpiece, and releasing the pressure is automatically performed, and the zero point can be measured and set during that time, so efficient work can be achieved. At the same time, set the work tool zero point for managing the work tool and the work zero point for managing the work, and for the work zero point, set the standard work zero point and the average work zero point to manage welding. As a result, more practical processing management can be performed, and further, the processing tool can be managed, so that widespread use is expected especially in the management of projection welding devices and the like.

DESCRIPTION OF SYMBOLS 1 ... Welding device, 2 ... Air cylinder unit, 8 ... Positioning pin, 20 ... Control box.

Claims

A welding management method for performing welding management of a workpiece by setting a zero point and a predetermined allowable value range for the zero point. When setting the zero point, in the zero point setting mode, When automatically performing a series of zero point setting cycles such as setting the workpiece on the electrode, lowering the upper electrode, pressurizing the workpiece with the upper electrode, and releasing the pressure, in operation mode, When performing a series of welding cycles of workpiece setting, upper electrode lowering, workpiece pressurization, energization, and pressure release by the upper electrode, the zero point is automatically measured when the workpiece reaches the reference position. A welding management method for workpieces, characterized in that the setting is performed.
As the zero point, both a machining tool zero point based on a standard machining tool and a workpiece zero point based on a standard workpiece are set, and the workpiece zero point is a standard workpiece set based on the first standard workpiece. A zero point and an average workpiece zero point that is set based on an average value of a plurality of workpieces during a series of machining operations are provided, or a combination of the machining tool zero point and the reference workpiece zero point, or the machining tool zero point And any one of the above-mentioned average workpiece zero points can be selected arbitrarily, and welding control is performed so that welding cannot be performed when the allowable range of the two zero points of each combination is not satisfied, and the zero point is set. In this case, a workpiece welding management method based on zero point setting, which is based on the description of claim 1.
A welding management method for performing welding management of a workpiece by setting a zero point and a predetermined allowable value range for the zero point, wherein the zero point is a processing tool zero point based on a reference processing tool, and a reference Both the workpiece zero point based on the workpiece and the workpiece zero point are set to the reference workpiece zero point set based on the first reference workpiece and the zero point of multiple workpieces during a series of machining operations. When an average workpiece zero point set based on the average value is provided, and welding is controlled so that welding is not possible when the allowable range of the two zero points of the processing tool zero point and the reference workpiece zero point is not satisfied, and when welding is performed as appropriate In this case, the reference workpiece zero point value is replaced with the average workpiece zero point value for welding management, and the zero point setting is based on the description in claim 1. Welding management method of brute work.
A workpiece welding management apparatus having a zero point and a zero point setting mechanism capable of setting a predetermined tolerance range for the zero point, wherein the zero point setting mechanism is a lower part in the zero point setting mode. When automatically performing a series of zero point setting cycles such as setting the workpiece on the electrode, lowering the upper electrode, pressurizing the workpiece with the upper electrode, and releasing the pressure, in operation mode, When performing a series of welding cycles of workpiece setting, upper electrode lowering, workpiece pressurization, energization, and pressure release by the upper electrode, the zero point is automatically measured when the workpiece reaches the reference position. A workpiece welding management apparatus characterized by having a function for setting.
The zero point setting mechanism includes a processing tool zero point setting mechanism for setting a processing tool zero point based on a reference processing tool and an allowable value range thereof, a reference work zero point based on a first reference work, and an allowable value range thereof. The standard workpiece zero point setting mechanism for setting the average workpiece zero point and the average workpiece zero range set based on the average value of the zero points of multiple workpieces during a series of machining 5. The workpiece welding management apparatus according to claim 4, further comprising a zero point setting mechanism.
6. The workpiece according to claim 5, wherein the average workpiece zero point setting mechanism can arbitrarily set a number of times for obtaining an average, a timing for obtaining an average, and the like in a control box. Welding management device.
7. The processing speed for setting a zero point of software incorporated in a CPU for setting each zero point is within one second. The workpiece welding management device described.