• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Electrode replacement procedure (11) of an electric clamp (1) for sheet metal welding (2) of a motor vehicle, comprising the steps of increasing a milling number counter (51) in a welding control device (3), measuring on the part of the electric clamp (1) a milled dimension of the electrode (61), comparing the milled dimension of the electrode (61) with a predetermined dimension of the electrode (62), and carrying out the replacement of the at least one electrode (11). ) if the milled dimension of the electrode (61) is greater than said predetermined dimension of the electrode (62), or perform the replacement of the at least one electrode (11) if the counter of the milled number (51) is greater than a quantity of milling prefixed (52). Control device of said electric clamp (4) that controls said electrode replacement procedure (11), in order to detect that they have reached the end of their useful life. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2549174A1
    申请号:ES201530594
    申请日:2015-04-30
    公开日:2015-10-23
    发明作者:Jordi MAURI VIDAL；Antonio María GENDRAU MAGRE
    申请人:SEAT SA；
    IPC主号:
    专利说明:

    DESCRIPTION

    Electrode replacement procedure and control device of an electric clamp for welding of automobile vehicle plate
     5

    OBJECT OF THE INVENTION

    The purpose of the present patent application is a method of electrode replacement of an electric clamp for welding of automobile plate, according to claim 1, which incorporates notable innovations and advantages.

    Additionally, the present patent application also aims at a control device for an electric clamp for welding of a vehicle plate, according to claim 8, which incorporates notable innovations and advantages. fifteen


    BACKGROUND OF THE INVENTION

    In the state of the art there are various known solutions of electrode replacement procedures of an electric clamp for welding of automobile vehicle sheet, as well as of electrical clamp control devices.

    Thus, it is known from the state of the art, as reflected in document US20080237199, a method to ensure that a conditioning operation of the welding electrode tip is carried out correctly, taking advantage of the electrode wear compensation routine. The method uses the total wear measurements of the tip to calculate a difference in electrode wear between successive operations. This value is used to make a comparison with the average stored wear, to conclude if the tip conditioning operation is working properly. Said compensation method focuses on performing a correct welding point after a cutting operation, based on knowing the amount cut, compensating, calculating the difference between the cut and the average and comparing said values. The method aims to improve the welding operation, and not take advantage of the life of the welding electrodes. It also uses statistical mean values for such compensation, so that a precise adjustment is not achieved.

    It is on the other hand known from the state of the art, as reflected in document US20080237303, a method for determining that the electrodes of a welder of electrical resistance are in need of replacement. The control of the speed of the progressive wear of the electrodes during the realization of successive welds is included. The method therefore serves to know the wear of electrodes, and the time at which they must be cut according to the depth of the dent of the welding points. It would not allow, however, to obtain a precise value to know the moment of cut. 10

    It is also known from the state of the art, as reflected in document ES2361687, an automated method of detecting the wear of a non-fusible electrode of an arc welding torch and replacing it with a new electrode or automatic machining of said electrode, When it is eroded. Proceed in accordance with the following 15 steps: a) during welding, the number of primings performed by the considered electrode and, at least, a wear indicator parameter selected between the arc time of said electrode and the time of priming for the establishment of the arch; b) compare the value of at least one of the wear indicator parameters determined in step a) with at least one respective predetermined reference value; c) 20 proceed to replace the electrode eroded by a new or sharpened electrode when the value of at least one of the wear indicator parameters is greater than or equal to at least said respective predetermined reference value. Said automated procedure does not, however, suggest knowing the wear of the electrode according to the welding time, and comparing it with a reference value. 25

    Thus, it is seen that there is still a need, both for an electrode replacement procedure, and for a control device for an electric clamp for welding of a vehicle plate, so that the life of the electrode, or copper tip , of an electric clamp is governed by said electric clamp, simultaneously to the government by 30 part of the welding control device, providing greater replacement accuracy with respect to the government only by means of the welding control device, as is usually done up to now.

     35
    DESCRIPTION OF THE INVENTION

    In accordance with the present invention, this task is solved by means of an electrode replacement procedure and control device of an electric clamp for welding of the vehicle plate according to claims 1 and 8. Additional advantages of the invention are presented accompanying the characteristics included in the dependent claims, mentioned in the description described below.

    At present, spot welding is a method of resistance welding that is based on pressure and temperature, in which a part of the parts to be welded by electric current is heated to temperatures close to the melting, and a pressure between them. The base materials must be arranged overlapping between electrodes, which are responsible for sequentially applying the pressure and current corresponding to the cycle producing one or more welding points. fifteen

    The electrodes of the welding pliers have a life cycle, considering in practice as a constant value the result of multiplying the number of welding points between one milling and the next, by the number of milling. The reality indicates, however, that it may not be a constant value since it depends on several factors such as the wear of the milling blade (the greater the wear, the lower cut of the electrode), the state of the disc, the effort of the clamp, etc ... It is therefore contemplated that the action of changing the electrode is requested by the control of the electric clamp, since after each cutting action of the electrode, or milling, a measurement is always made to know how many tenths of a millimeter is They have milled. This measurement is made to check that there is always the same distance between sheet and electrode.

    Currently it is programmed in the robot welding control that includes the electric clamp, a milling rate (number of welding points that are made until a milling) and a certain number of milling. This multiplication gives us the 30 number of points that are made with a pair of electrodes or, what is the same, their life. Therefore, a constant electrode lifespan is implemented and independent of other factors. Taking into account the real factors, the blade that makes the milling cuts less each time although it is still functional. The problem arises of having to blindly change the electrodes, before they are really worn out. 35

    In practice, the cadence is adjusted and, above all, the number of millings, to take advantage of the 10 mm (5mm of each of the two electrodes), considering the new milling blade. It does not take into account how the milling machine blade is progressively worn out, and that makes, as the blade wears away, it cuts less electrode. 5 As the number of millings is not adapting to the new situation, the electrodes progressively change more and more new. It is therefore necessary to optimize the life of the welding electrodes based on the parameters that modify longevity and not establish the replacement of the electrodes as a constant value of the number of welding points made. That is why the 10 real parameters must be taken into account such as: perpendicular programming of the robot, distance electrode plate, state of the disk, effort of the clamp ... in order to take advantage of all the copper (10mm) of the electrodes.

    Thus, and more specifically, the present invention consists in a method of replacing electrodes of an electric clamp for welding of automobile vehicle plate, which comprises the steps of:
    (i) mount at least one electrode of the electric clamp in its housing,
    (ii) carry out the welding of the automobile vehicle plate a number 'n' of times,
    (iii) perform a milling of at least one electrode after welding, 20
    additionally comprising the steps of:
    (iv) increase a milling number counter in a welding control device,
    (v) measure a milled electrode dimension by the electric clamp,
    (vi) compare the milled electrode dimension with a preset 25 electrode dimension, and
    (vii) perform the replacement of the at least one electrode if the milled dimension of the electrode is greater than said predetermined dimension of the electrode, or
    (viii) perform the replacement of the at least one electrode if the milling number counter is greater than a predetermined quantity of milling. 30

    It is important to specify that the milled dimension of the electrode means the absolute milled value since the electrode is new. Therefore, the sum of all the lengths cut during the life of the electrode form the milled dimension of said electrode.
     35
    By means of said procedure, the electrode change is programmed in parallel, either because this is established by the control of the electric clamp, or because the welding control device so establishes it. Welding control device means the electronics that monitor the welding process, controlling factors such as number of repetitions, cadence, etc ... This results in savings on electrodes, 5 taking advantage of all copper (5mm wear of each electrode ), and also a saving of time with respect to the number of electrode changes. It is noteworthy that with the change of electrodes by constant value, it is carried out prematurely to a real need. That is why, through the procedure presented, the time is optimized as the electric clamp is less inoperative time due to electrode changes. 10

    It is therefore possible to automate the wear and replacement of the blade of a milling machine, resulting in an increase in the quality of the welding points. A bad blade causes many defective welding points, for example producing sharp burrs and edges that could cut the user of the motor vehicle. 15 In addition, when a blade does not cut well, the electrodes harden and contaminate causing loose points, unwanted burrs are caused after milling, causing machine errors, unwanted tattoos on points, welding errors, poor regulations on adaptive controls, etc ...
     twenty
    Thus, and by means of the present invention it is achieved, firstly, to ensure the life of the electrode by lengthening it to the maximum, but without exceeding the limit in which it performs its functions correctly and, secondly, controlling whether the blade or milling machine performs correctly milling (the worn blade cuts less or practically does not cut), thus also controlling the life of the blade or milling machine. 25

    According to another aspect of the invention, the replacement of electrodes is carried out, by the welding control, if the amount of millings predetermined is at least 150, following the value resulting from the following calculation: = 100 + number of millings than the electrodes they support with new blade and with maximum wear allowed of 10mm. In this way a specific fixed value is programmed, redundantly to the control of the electric clamp, in order to also control the life of the milling cutter blade by the welding control.

    Advantageously, the process of the present invention contemplates the case that if the milled dimension of the electrode is smaller than said predetermined dimension of the electrode, and / or if the milling number counter is smaller than a predetermined amount of milling, then a new welding cycle in stage (ii). Thus, the procedure allows to continue with the next welding cycle if there is no blocking condition.

    In a preferred embodiment of the invention, the measurement by the electric clamp of the milled dimension of the electrode of step (v) is carried out by means of a variable control of the electric clamp. By variator control, reference is made to the electronic control element that governs an actuator element of the electric clamp, such as the motor of the movable arm. In this way the measurement made by the electric clamp is used to control the wear of the electrodes and their replacement. 10

    More specifically, the step of measuring a milled electrode dimension by the electric clamp further comprises the steps of:
    - close the electric clamp until both electrodes touch,
    - calculate a displacement of at least one mobile arm, and 15
    - open the electric clamp to the original position.

    Thus, and in a preferred embodiment of the invention, the method comprises an additional step of determining the variation of a dimension of the milled electrode by the variant control of the electric clamp. Mention that, since the electrodes wear out over time, mainly due to the milling function, in the worst case being up to 5 mm at each electrode, one of the consequences is that the welding cycle is lengthened, because the path of the electrodes increases. To mitigate this effect, there is the function of electrode geometry verification. When activated, after each milling, the clamp closes until the electrodes touch, and then the original position opens up to 25. In this way, the variant control of the electric clamp detects the wear suffered by the electrodes, and the distance between them can be maintained.

    Advantageously, the additional step of determining the variation of the dimension of the milled electrode comprises comparing the milled dimension of the electrode with a milled dimension 30 of the previously stored electrode of a previous welding cycle. Thus, and as mentioned, the variant control of the electric clamp moves its mobile arm with an electric motor, and it has a sensor that controls the position, compares the position after milling with respect to the previous milling, so that it can determine how much The electrodes have been trimmed. 35

    Add that knowing the value of the variation of the electrode dimension allows you to precisely modify the position of the welding arms with respect to the sheet, so that the welding quality is optimal at all times. In addition, this value is also used to verify the status of the milling machine or blade: if the variation is zero, it means that it is not being cut, and therefore there is a defect, or excessive wear, on the blade or milling machine.

    The object of the present invention is also the control device of an electric clamp that controls the electrode replacement procedure, and which comprises a sensor in which said sensor sends information on the position of the at least one mobile arm of the electric clamp, said control device further comprises display means that show information of at least one stage of the electrode replacement procedure, so as to improve the monitoring of the operation by the persons in charge of its supervision. With at least one stage of the procedure it is referred to that information on one or more stages of the procedure appears on the same screen of the display means, not necessarily having to show the stages of the procedure sequentially.

    More particularly, the display means show whether a replacement of the at least one electrode is due to: a) that a milled dimension of the electrode is greater than a predetermined dimension of the electrode, b) or, that a counter of the number milling is greater than a predetermined quantity of milling, which gives an information of whether the electrode has really worn out or, on the contrary, has simply reached the maximum predetermined amount by default. 25

    More specifically, the display means emits a signal when a milled electrode dimension detected by the electric motor sensor of at least one movable arm is greater than a predetermined electrode dimension. Thus, by programming we can know if in the robot of the electric clamp it is going to replace electrodes, either by the detection of the electric clamp, or by indication of the welding control. Specify that when the robot goes to replace electrodes by indication of the welding control, it is indicative that it is because the blade is worn. This signal is implemented in the HMI (Human Machine Interface) of the complementary installation to the robot of the electric clamp, indicating in a controlled way that the blade should be changed. 35

    Advantageously, the predetermined electrode dimension equals a preset electrode wear value of maximum 10mm, said dimension being the sum of both electrodes of 5mm.
     5
    According to another aspect of the invention, the display means emits a signal when a milled electrode dimension detected by the electric motor sensor of at least one mobile arm is greater than or equal to a compromised electrode wear value. This calls the attention of the operator of the welding robot about the need for a replacement of the electrodes. 10

    Specifically, the predetermined compromised value of electrode wear is 8.5 mm, so that a measure is established with a certain margin with respect to the maximum possible, giving a greater preponderance to the quality of the welding points.
     fifteen
    The attached drawings show, by way of non-limiting example, the elements on which the electrode replacement procedure of an electric clamp for welding of a vehicle vehicle is based, as well as the control device, both of which are in accordance with the invention Other features and advantages of said electrode replacement procedure and control device of an electric clamp for welding of a 20-sheet automobile vehicle, object of the present invention, will be apparent from the description of a preferred, but not exclusive, embodiment. which is illustrated by way of non-limiting example in the accompanying drawings, in which:

     25
    BRIEF DESCRIPTION OF THE DRAWINGS

    Figure 1A.- It is a perspective view of the device of an electric clamp for welding of automobile vehicle sheet, in accordance with the present invention;
    Figure 1B.- It is a profile view of the device of an electric clamp for welding of 30 plate of a motor vehicle, in accordance with the present invention;
    Figure 2.- It is a view of the display means of the control device of an electric clamp for welding of automobile vehicle sheet, in accordance with the present invention;
    Figure 3.- It is a view of the control device of an electric clamp for welding of automobile vehicle sheet, in accordance with the present invention;
    Figure 4.- It is a view of the display means of the control device of an electric clamp for welding of automobile vehicle sheet, in accordance with the present invention; 5
    Figure 5A.- It is a profile view of an electrode of the device of an electric clamp for welding of automobile vehicle sheet, in accordance with the present invention;
    Figure 5B.- It is a perspective view of the blade of the milling machine of an electric clamp for welding of automobile vehicle sheet, in accordance with the present invention;
     10

    DESCRIPTION OF A PREFERRED EMBODIMENT

    In view of the aforementioned figures and, according to the numbering adopted, an example of a preferred embodiment of the invention can be observed therein, which comprises the parts and elements indicated and described in detail below.
    Thus, as can be seen in Figures 1A, 1B, 2 and 4, the electrode replacement procedure 11 of an electric clamp 1 for welding of a vehicle 2 sheet, comprises the steps of:
    (i) mount at least one electrode 11 of the electric clamp 1 in its housing 12,
    (ii) carry out the welding of sheet 2 of a motor vehicle a number 'n' of times,
    (iii) perform a milling of at least one electrode 11 after welding,
    additionally comprising the steps of:
    (iv) increase a milling number counter 51 in a welding control device 3,
    (v) measure on the part of the electric clamp 1 a milled dimension of the electrode 61,
    (vi) compare the milled dimension of electrode 61 with a predetermined dimension of electrode 62, and
    (vii) perform the replacement of at least one electrode 11 if the milled dimension of the electrode 61 is larger than said predetermined dimension of the electrode 62, or
    (viii) replace at least one electrode 11 if the milling number counter 51 is greater than a predetermined number of milling 52.
    It should be mentioned that the milled dimension of electrode 61 refers to the absolute milled value since the electrode is new. It is therefore not the dimension milled in each of the cuts of the blade, but it is the sum of all the quantities cut.

    More particularly, as seen in Figures 2 and 4, the replacement of electrodes 11 is performed if the predetermined milling amount 52 is at least 150. Said value is standardized by considering that when 5mm of each electrode is trimmed. , the electrode has reached the end of its life. Although it is possible to hurry more geometrically, it is not convenient, since exactly the same amount of electrode is not cut from the pair of electrodes mounted simultaneously on the electric clamp, and sometimes the housings 12 with the 10 electrodes 11 enter the milling machine twisted, at 45 ° for example (by mechanical study of the clamp). Thus it is considered that welding with electrodes 11 worn 5mm on each side does not jeopardize the installation either from the point of view of quality (copper quality) or production (breakdowns). The value of 150 comes as a result of adding 100 to the number of millings that the electrodes 11 support with a new milling blade 71 and with a maximum allowable wear of 10mm. This value is considered a standard parameter applicable to all robots with electric welding clamps of the plants of the same business consortium.

    It should be noted that a preferred embodiment is shown in Figure 2, in which the information shown on the display of the display means 45 of the welding control device 3, comprises, in particular, in two of its frames of information, the number of milling counter 51 and the predetermined number of milling 52. On the other hand, an example of preferred embodiment is shown in Figure 4, in which the information shown on the display of the display means 45 of the welding control device 3, specifically comprises, in one of its information frames, the milled dimension of electrode 61.

    According to another aspect of the invention, as can be seen in Figures 2 and 4, if the milled dimension of the electrode 61 is smaller than said predetermined dimension of the electrode 62, and / or if the milling number counter 51 is smaller than one predetermined amount of milling 52, a new welding cycle is initiated in step (ii).

    In more detail, as can be seen in Figure 3, the measurement by the electric clamp 1 of the milled dimension of the electrode 11 of step (v) is carried out by means of a variable control 41 of the electric clamp 1. Specifically, it is proposed that the life of the electrodes 11 be managed by the electric clamp 1 since it is this that has the exact control of the wear of the electrodes 11. The electric clamp 1, after milling, always makes a measurement to know how many tenths of mm the electrodes 11 have been milled. This is done to always maintain the same distance between electrode 11 and plate 2, 5 regardless of how the geometry of the electrodes 11 changes, in order to control possible welding defects such as: burrs on electrodes 11 (avoid dot tattoo ) or check the cones of the housings 12 for the electrodes 11 (avoid water leaks).
     10
    According to a preferred embodiment of the invention, as shown in Figure 1B, the step of measuring by means of the electric clamp 1 a milled dimension of the electrode 11 further comprises:
    - close the electric clamp 1 until both electrodes 11 touch,
    - calculate a displacement of at least one mobile arm 42, and 15
    - open the electric clamp 1 to the original position.
    These steps define the function of electrode geometry verification 11. When activated (usually after each milling), the clamp 1 closes until the electrodes 11 touch; Then it opens to the original position. When the mechanical stop is made, the information is given to the electric clamp 1 of the current dimension of the electrodes 11. 20 Specifically, the measurement is carried out through an encoder, or sensor element 44, which allows to know the number of degrees rotated by the motor of the mobile arm 42. Knowing a relationship between the number of degrees and its equivalent in millimeters, it is possible to know the dimension of the milled electrode 11.
     25
    According to another aspect of the invention, as can be seen in Figure 3, the electrode replacement procedure 11 of an electric clamp 1 for welding of a vehicle 2 sheet comprises an additional step of determining the variation of an electrode dimension 11 milling by the variator control 41 of the electric clamp 1.
     30
    Additionally, as seen in Figure 3, the additional step of determining the variation of the dimension of the milled electrode 11 comprises comparing the milled dimension of the electrode 61 with a milled dimension of the electrode 61 previously stored from a previous welding cycle.
     35
    On the other hand, as can be seen in Figure 3, said electric clamp 1 comprises at least one mobile arm 42 actuated by an electric motor 43, which in turn comprises a sensor 44 where the sensor 44 sends information on the position of the at least one movable arm 42 of the electric clamp, in turn comprising display means 45 showing information of at least one stage of the electrode replacement procedure 11. 5

    According to a preferred embodiment of the invention, as seen in Figure 3, the display means 45 shows whether a replacement of at least one electrode 11 is due:
    a) that a milled dimension of electrode 61 is greater than a predetermined dimension of electrode 62, 10
    b) or, that a milling number counter 51 is greater than a predetermined number of milling 52.

    More particularly, as seen in Figures 3 and 5A, the display means 45 emits a signal when a milled dimension of the electrode 61 detected by the sensor 44 15 of the electric motor 43 of at least one movable arm 42 is greater than a predetermined dimension of electrode 62. Said warning signal is visual and / or acoustic. On the other hand, said output signal highlights the maximum wear of electrodes 11, activating at the same time as when the electric clamp 1 measures more than 10mm of wear. According to a preferred embodiment of the invention, the message of the welding control signal 20 consists of the words "End of Life" or "Worn Electrode".

    More particularly, as seen in Figure 5A, the predetermined dimension of electrode 62 is equivalent to a predetermined value of electrode wear 11 maximum of 10mm.
     25
    According to another aspect of the invention, as seen in Figures 3 and 5A, the display means 45 emits a signal when a milled dimension of the electrode 61 detected by the sensor 44 of the electric motor 43 of at least one mobile arm 42 is greater than or equal to a compromised value of electrode wear 11.
     30
    More particularly, as seen in Figure 5A, the predetermined compromised value of electrode wear 11 is 8.5 mm. The output signal warns of electrode wear: It is activated if the measured wear is greater than the default value of maximum wear (-1.5mm), that is, it is activated when the clamp measures 8.5mm of wear. It is the equivalent to the pre-alarm of welding control. 35

    The details, shapes, dimensions and other accessory elements, as well as the components used in the implementation of the electrode replacement procedure, as well as the control device of an electric clamp for welding of automobile vehicle plate, may be conveniently replaced. by others that are technically equivalent, and do not deviate from the essentiality of the invention or the scope defined by the claims that are included after the following list.

    List references:
     10
    1 electric clamp
    11 electrode
    12 housing (electrode)
    2 sheet
    3 welding control device 15
    4 control device of an electric clamp
    41 drive control (electric clamp)
    42 movable arm (electric clamp)
    43 electric motor (electric clamp)
    44 sensor (electric motor) 20
    45 display media
    51 milling number counter
    52 preset milling quantity
    61 milled electrode dimension
    62 preset electrode dimension 25
    71 milling blade
    权利要求:
    Claims (1)
    [1]

    1- Electrode replacement procedure (11) of an electric clamp (1) for welding of sheet metal (2) of a motor vehicle, comprising the steps of:
    (i) mount at least one electrode (11) of the electric clamp (1) in its housing (12),
    (ii) perform the welding of sheet metal (2) of a motor vehicle a number 'n' of times,
    (iii) perform milling of at least one electrode (11) after welding
    characterized in that it additionally comprises the stages of:
    (iv) increase a milling number counter (51) in a welding control device (3),
    (v) measure a milled electrode dimension (61) by the electric clamp (1),
    (vi) compare the milled electrode dimension (61) with a preset electrode dimension (62), and
    (vii) perform the replacement of the at least one electrode (11) if the milled dimension of the electrode (61) is greater than said predetermined dimension of the electrode (62), or
    (viii) replace at least one electrode (11) if the milling number counter (51) is greater than a predetermined quantity of milling (52).
    2- Electrode replacement procedure (11) of an electric clamp (1) for welding 20 of automobile vehicle sheet (2) according to claim 1, characterized in that the electrode replacement (11) is performed if the amount of milling preset (52) is at least 150.
    3- Electrode replacement procedure (11) of an electric clamp (1) for welding 25 of automobile vehicle sheet (2) according to claim 1, characterized in that if the milled dimension of the electrode (61) is smaller than said predetermined dimension of the electrode (62), and / or if the milling number counter (51) is less than a predetermined quantity of milling (52), a new welding cycle is initiated in step (ii).
     30
    4- Electrode replacement procedure (11) of an electric clamp (1) for welding of the vehicle plate (2) according to claim 1, characterized in that the measurement by the electric clamp (1) of the milled dimension of the electrode (61) of step (v) is performed by means of a variator control (41) of the electric clamp (1).
     35
    5- Electrode replacement procedure (11) of an electric clamp (1) for welding of the vehicle plate (2) according to claim 1, characterized in that the step of measuring by the electric clamp (1) a milled dimension of the electrode (61) further comprises:
    - close the electric clamp (1) until both electrodes (11) touch, 5
    - calculate a displacement of at least one mobile arm (42), and
    - open the electric clamp (1) to the original position.
    6- Electrode replacement procedure (11) of an electric clamp (1) for welding of the vehicle plate (2) according to claim 1 or 4, characterized in that 10 comprises an additional step of determining the variation of an electrode dimension (11) milling by the variator control (41) of the electric clamp (1).
    7- Electrode replacement procedure (11) of an electric clamp (1) for welding of the vehicle plate (2) according to claim 1, characterized in that the additional step 15 of determining the variation of the electrode dimension (11) milling comprises comparing the milled dimension of the electrode (61) with a milled dimension of the electrode previously stored from a previous welding cycle.
    8- Control device of an electric clamp (4) that controls the electrode replacement method according to claim 1, wherein said electric clamp (4) comprises at least one mobile arm (42) actuated by an electric motor (43 ), which in turn comprises a sensor (44) characterized in that the sensor (44) sends information on the position of the at least one movable arm (42) of the electric clamp and because it comprises display means (45) showing information of at least one stage of the electrode replacement procedure (11).
    9- Control device of an electric clamp (4) that controls the method according to claim 8, characterized in that the display means (45) show whether a replacement of the at least one electrode (11) is due: 30
    a) that a milled electrode dimension (61) is larger than a preset electrode dimension (62),
    b) or, that a milling number counter (51) is greater than a predetermined amount of milling (52).
     35
    10. Control device of an electric clamp (4) that controls the method according to claim 8, characterized in that the display means (45) emit a signal when a milled dimension of the electrode (61) detected by the sensor (44) of the Electric motor (43) of at least one movable arm (42) is larger than a predetermined dimension of the electrode (62). 5
    11- Control device of an electric clamp (4) that controls the method according to claim 10, characterized in that the predetermined dimension of the electrode (62) is equivalent to a predetermined value of electrode wear (11) maximum of 10mm.
     10
    12- Control device of an electric clamp (4) controlling the method according to claim 8, characterized in that the display means (45) emit a signal when a milled dimension of the electrode (61) detected by the sensor (44) of the Electric motor (43) of at least one movable arm (42) is greater than or equal to a compromised value of electrode wear (11). fifteen
    13. Control device of an electric clamp (4) that controls the method according to claim 12 characterized in that the predetermined compromised value of electrode wear (11) is 8.5 mm.
     twenty
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    ES2549174B2|2016-03-29|
    EP3088120A1|2016-11-02|
    引用文献:
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    WO1994009939A1|1992-11-05|1994-05-11|Joachim Aronsson|A method for automatic program compensation of electrode wear|
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    EP3043950A1|2013-09-13|2016-07-20|Sinterleghe S.r.l.|An automated adaptive maintenance method and system for welding gun electrodes|EP3878591A1|2020-03-13|2021-09-15|Lutz Precision, K.S.|Electrode cap milling device and method of controlling electrode cap milling device|
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    EP16382135.8A| EP3088120A1|2015-04-30|2016-03-23|Method for replacing electrodes and control device for an electric clamp for welding the sheet metal of a motor vehicle|
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