• 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:
    The inventive method and the inventive apparatus for performing the method allow the detection of quality defects on a longitudinal weld in the production of containers made of sheet metal with a resistance roller seam welding machine (1). In this case, at least one of the guide rollers (9a) is directly or indirectly driven by a servomotor (27), which is synchronized with the Zargenlauf or the welding speed of the welding rollers (11, 13). The detection of the torque of the servomotor (27) and / or the torque of the drive motor (15) allows detection of quality defects of the weld.
    公开号:CH713905A1
    申请号:CH00809/17
    申请日:2017-06-21
    公开日:2018-12-28
    发明作者:Umbricht Ruedi
    申请人:Can Man Ag；
    IPC主号:
    专利说明:

    The invention relates to a method for detecting quality defects in a longitudinal weld seam in the production of containers from sheet metal according to the preamble of claim 1. The invention further relates to a device according to claim 4.
    When welding longitudinal seams of tubular workpieces, in particular from sheet metal frames to containers such as cans, buckets or barrels on a roller seam resistance welding machine, the quality of the weld seam is in the foreground. In addition to a stable welding current and a stable welding pressure, this also depends in particular on the quality of the sheet to be welded, its tinning or other metallic coatings as well as the quality of the welding electrodes, the intermediate welding electrode (wire) and their dimensional accuracy.
    The main causes of a change in quality, in particular a reduction in the quality of the weld seam, are cutting errors when cutting the sheet for the formation of the predominantly cylindrical frame.
    Cutting errors can be: arch cuts, i.e. the edges that are to be welded to one another are not straight and consequently their overlap is different between the beginning and end of the weld seam and consequently the cross section of the overlapping sheet metal edges is not constant. Angular errors in the sheet metal blanks also cause errors in the overlap of the sheet edges. Another problem can be the wrong setting of the welding geometry, i.e. the forces and transverse forces applied to the edges to be welded during welding.
    These problems are generally known and attempts are made to compensate for these inaccuracies by appropriately recording and evaluating various disturbance variables. A corresponding device and a method for this are known from EP 2 243 584. In this known method or the corresponding device, a large number of disturbance variables are recorded and with these actuating variables are calculated which are intended to correct the disturbance variables and to improve the quality of the weld seam. The detection and evaluation of the disturbance variables is complex and, moreover, their processing is usually not possible within the time required for this, since at most milliseconds are available for the compensation of deviations from the norm. The reaction time to disturbance variables, which have to take place by adjusting the guide elements and the welding pressure, is greater than the time available during the welding of the seam on the container which is detected as being defective.
    The measurement and monitoring of the welding currents, the welding voltage, the welding pressure, the seam temperature, the seam thickness or the pressure on the guide elements are also already known.
    An object of the present invention is to provide a method for detecting quality defects with a minimum of technical effort and with the detected values to provide a basis for decision to eject or tolerate defective containers after welding and to process them further.
    This object is achieved by a method according to the features of claim 1 and a device according to claim 4. Advantageous embodiments of the method are described in the dependent claims.
    The inventive method and the inventive device makes it possible to determine with a single measured value, namely the change in torque on a guide roller, whether the edge areas of the sheet metal frame welded between the two welding electrode rollers have flawlessly expired. This method makes it possible to monitor the formation of an optimally formed weld directly during welding and to detect deviations. In particular, it can be determined whether the overlap of the two edge regions of the sheet metal frame, which are welded to one another, remains constant over the entire length of the frame or whether there are curved cuts or bevel cuts or other inaccuracies such as defective coating. Such changes in overlap change the necessary torque with which the sheet metal frame has to be passed between the welding rollers in order to achieve an optimal welding seam. The torque changes are measured on at least one guide roller, which is preferably opposite the pair of welding rollers of the welding machine. With this arrangement, it is possible to determine the torque changes very precisely, since the effect of non-constant overlap of the sheet metal edges or differences in diameter of the container means braking or acceleration, i.e. consequently, the torque of the drive motor on the opposite guide roller is changed accordingly.
    The torque change can also be measured on the welding roller drive, i.e. on the master drive motor 15. However, due to the general oversizing of this drive, the same high level of accuracy cannot be expected. The change in torque, which is measured on a driven guide roller and is preferably opposite the pair of welding rollers of the welding machine, can be recorded and recorded very precisely due to minor side influences, smallest load changes (slippage, speed fluctuations and other forces).
    [0008] The invention is explained in more detail with the aid of a section of a welding machine in the single figure (FIG. 1) in the area of the welding electrode rollers. In the single figure (FIG. 1), reference number 1 shows the welding area of a fully automatic welding machine for welding containers such as cans, buckets and barrels made of black plate, tin plate, TFS plate (TinFreeSteel) or the like, Darge2
    CH 713 905 A1. A guide roller ring 7 is arranged on a machine frame 3, which is not described in more detail, supported by a portal 5. The guide roller ring 7 comprises a plurality, e.g. nine guide rollers 9, also called diabolo rollers 9, arranged. The outer surfaces of the guide rollers 9 are concave in such a way that they form a circular passage together. The passage is only interrupted a few millimeters in the area of the welding point. At this point, an inner welding roller 11 and an outer welding roller 13 are arranged to form a gap. The inner welding roller 11 lies entirely within the passage formed by the guide rollers 9; the outer welding roll 13 is outside and is usually driven by a master drive motor 15. The master drive motor 15 with the outer welding roller 13 attached to it is mounted on a horizontally running pivot axis A, so that the outer welding roller 13 can be guided with a predeterminable and also adjustable contact force against the inner welding roller 11 or against the overlapping edges of a sheet metal frame 21 is. On the left side, reference number 17 denotes a welding arm, on the apex of which a guide rail is fastened at least in the area in front of the pair of welding rollers 11, 13. The guide rail is also called a Z-rail and serves to guide sheet metal blanks rounded to sheet metal frames 21 on the welding machine 1 to the welding rollers 11, 13. The means of transport for advancing the sheet metal frames 21 is not shown, since it is known from the prior art. In the guide rail, the edges of the sheet metal blanks are guided into an overlap suitable for welding them. The overlap of the edges of the sheet metal frames 21 is between a few tenths of a millimeter and several millimeters, depending on the size of the container to be produced. An endless belt 23 leads to a pulley 25 on the output shaft of a slave electric motor 27 via the guide roller 9a lying in the lower vertex of the guide roller ring 7. The upper run 23 'of the endless belt 23 is arranged such that the lower vertex line of the welded sheet metal frame 21 with the Belt 23 is in contact and accomplishes an auxiliary or additional transport of the welded sheet metal frame 21 together with the two welding rollers 11, 13. In other words, the speed v of the rotating belt 23 or its upper run 23 'corresponds to the peripheral speed of the two welding rollers 11, 13. Consequently, the sheet metal frames 21 driven or conveyed by these elements are welded at a defined speed.
    This arrangement is state of the art and is used in particular on high-quality welding machines.
    The master drive motor 15 of the external welding roller 13 and the slave electric motor 27 for driving the guide roller 9a - in the example shown via a belt 23 - are electronically synchronized to ensure correct guidance even of containers 21 with a low height, ie small axial extent, e.g. flat containers for canned fish, by the welding rollers 11, 13 to ensure.
    Instead of the conventional slave electric motor 27, a servo motor with control electronics for driving the belt 23 or the guide roller 9a is used according to the invention, which is able to read even minimal changes in the torque on the guide roller 9a and the belt 23 do. Torque fluctuations are signs that there are exceptional influences in the area of the weld seam produced by the two welding rollers 11, 13. Such torque fluctuations can have different causes. On the one hand, arch cuts, i.e. Edges that are not exactly running to be welded together can lead to an increased torque if the edges to be welded increase the calculated circumference of the sheet metal frame 21 in such a way that passing through the guide roller ring 7 and the two welding rollers 11, 13 causes an increase in the transport resistance. On the other hand, the circumference of the sheet metal frame can be reduced to such an extent that the overlap of the edge areas that have to be welded is smaller or there is no longer any overlap and consequently no welding of the two edge areas of the appropriate quality is possible. It should be noted that a perfect weld seam can only be produced if the overlap of the edges of the sheet metal frame 21 is constant over the entire length of the sheet metal frame 21. Other causes of an increase or decrease in the set torque can be angular errors in the sheet metal blanks from which the sheet metal frames 23 have been produced, as a result of which the edge regions also overlap or are too small. Other causes can also be defects in the surface of the edge areas, which make it impossible to weld the two overlapping edges properly. The wear of the welding rollers 11, 13 and / or the wire intermediate electrodes also lead to deviations in the transport resistance and consequently to changes in torque. Furthermore, an incorrectly set Z-rail or a welding roller can result in deviations for the intermediate electrode after “grooving” the groove.
    Depending on the measured deviation from a set target value of the torque or the current consumption of the slave electric motor 27, the machine controller decides whether the sheet metal frame 21 which has passed through the welding rollers 11, 13 is correctly welded or is still tolerable or no longer tolerable. In the latter case, if the welding is no longer tolerated, the sheet metal frame 21 is ejected. The tolerance values can be stored in a memory. These differ on the one hand with regard to the different sheet metal qualities or sheet coatings and on the other hand with regard to the sheet thickness and diameter of the welded containers. All values represent empirical values that were recorded and evaluated during production.
    The recorded changes in torque cannot be used directly for setting the parameters on the welding machine. Especially when sheet metal frames are discarded because there are arch cuts, bevel cuts or defects on the sheet metal edges to be welded. In any case, there is frequent elimination, i.e. Deviation from a target torque, an indication of the fact that one or more manufacturing steps are faulty during the manufacture of a container or that corrections have to be made to the welding machine.
    CH 713 905 A1 The measured values of the torque on the lower guide roller 9a or on the slave electric motor 27 can be optically displayed on a display (not shown) or made visible by an acoustic display.
    Legend of the Reference Numbers [0013]
    I welding machine
    machine frame
    portal
    Leadership wreath
    guide rollers
    9a lower guide roller
    II inner welding roll outer welding roll
    Master drive motor
    Welding arm 21 sheet metal frames
    belt
    23a upper run
    pulley
    Slave electric motor
    权利要求:
    Claims (8)
    [1]
    claims
    1. A method for detecting quality defects on the longitudinal weld seam in the production of containers from sheet metal with a resistance roller seam welding machine (1), the two overlapping edges of the sheet metal blank previously rounded to a sheet metal frame (21) being guided in a guide rail and by one the sheet metal frame (21) comprising a ring (7) comprising a concave jacket and rotatably mounted guide rollers (9) held between a pair of welding rollers (11, 13) with a drive motor (15) and welded there, characterized in that at least one of the guide rollers (9a) in the roller ring (7) is driven directly or indirectly by an electric motor (27) which is synchronized with the peripheral speed with the frame passage or welding speed of the welding rollers (11, 13) and that on the electric motor (27) for the at least one guide roller (9a) and / or on the drive motor (15) for the welding roller pair (11, 13) deviations from the predetermined torque is detected during the welding process of the weld seam.
    [2]
    2. The method according to claim 1, characterized in that the deviations of the torque on the electric motor (27) of the guide roller (9a) or on the drive motor (15) for the welding rollers (11, 13) are measured and the measured values are shown on a display or reproduced acoustically become.
    [3]
    3. The method according to any one of claims 1 or 2, characterized in that when a predetermined range of the measured value of a target value is exceeded, there is an optical and / or an acoustic display and / or that the predetermined range is ejected by the sheet metal frame (21) with the detected defective weld.
    [4]
    4.Device for detecting quality defects on the longitudinal weld seam in the production of containers from sheet metal with a resistance roller seam welding machine (1), comprising a round station for rounding sheet metal blanks to a sheet metal frame (21), a guide rail for guiding the edges of the sheet metal frame (21 ), further a ring (7) comprising the sheet metal frame (21) and comprising a concave jacket and rotatably mounted guide rollers (9) and a pair of welding rollers (11, 13) which can be driven by a drive motor (15) for welding the two overlapping edges of the sheet metal frame (21), characterized in that at least one of the guide rollers (9a) is connected to an electric motor (27) and can be driven by it in synchronism with the welding speed, and in that the electric motor (27) and / or that the drive motor (15) of the outer welding roller ( 13)
    CH 713 905 A1
    Means are included with which changes in the torque on at least one of the two motors (15, 27) can be detected and / or measured.
    [5]
    5. The device according to claim 1, characterized in that at least one guide roller (9a) with the interposition of a rotating belt (25) can be driven by the electric motor (27).
    [6]
    6. The device according to claim 5, characterized in that the upper run (23a) of the belt (25) runs parallel to the transport direction and the weld seam on the sheet metal tendon (21).
    [7]
    7. The device according to claim 6, characterized in that the upper run (23a) with respect to the welding rollers (11, 13).
    [8]
    8. Device according to one of claims 5 to 7, characterized in that the upper run (23a) supports the sheet metal frame (21) during the welding of the edges of the sheet metal frame (21) and leads at the welding speed of the welding rollers (11, 13).
    CH 713 905 A1
    CH 713 905 A1
    SEARCH REPORT FOR
    SWISS PATENT APPLICATION
    Registration number: CH00809 / 17
    Classification of the application (IPC): Researched subject areas (IPC):
    B23K11 / 06, B23K11 / 36, B23K31 / 12, B23K101 / 06_B23K, G01 L
    RELATED DOCUMENTS:
    (Document reference, category, claims affected, details of the relevant parts (*))
    1 1132010170879 A1 (HONDA MOTOR CO LTD [JP] (B2); KANAYA KOHEI [JP]; MACHIDA HARUO [JP]; YAMAOKA NAOJI [JP]; ASAINA TSUTOMU [JP]; HONDA MOTOR CO LTD [JP]) 07/08/2010
    Category: A Claims: 1, 4 * [0006], [0007] *
    2 JP2000042752 A (NAT AEROSPACE LAB) 02/15/2000, JP-21568198-A, Epoque, [EPODOC / EPO]
    Category: A Claims: 1, 4 * & 4P.200ÖÖ42752 A (NAT AEROSPACE LAB) 02/15/2000
    3 CN105818950 A (UNIV EAST CHINA JIAOTONG) 01.06.2016, CN-201610160347-A, Epoque, [EPODOC / EPO]
    Category: A Claims: 2, 3 * whole document * & CN105818950 A (UNIV EAST CHINA JIAOTONG) 01.06.2016
    4 O.E39Ö230.8.C1 02.11.1989
    Category: A Claims: 1, 4 * whole document *
    5 O.E3447038 AI. (AUDI AG [DE]) 07/03/1986
    Category: A Claims: 1, 4 * Page 5 *
    CATEGORY OF THE DOCUMENTS CALLED:
    X: represent the novelty and / or the D:
    inventive step in question T:
    Y: in combination with a document of the same E:
    Category the inventive step in question
    A: define the general state of the art without particular relevance with regard to novelty and inventive L: activity &:
    O: non-written revelation
    P: were researched between the filing date of the
    Patent applications and the claimed priority date were published by the applicant in the application theories or principles on which the invention is based, patent documents whose filing or priority date is before the filing date of the researched application, but which were only published after this date for other reasons
    Member of the same patent family, matching document
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    同族专利:
    公开号 | 公开日
    CH713905B1|2021-05-14|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE3447038A1|1984-12-22|1986-07-03|Audi AG, 8070 Ingolstadt|DEVICE FOR TESTING ARRAYED, POINTED CONNECTIONS|
    DE3902308C1|1988-12-16|1989-11-02|Elpatronic Ag, Zug, Ch|
    US20100170879A1|2009-01-07|2010-07-08|Honda Motor Co., Ltd.|Seam welding method and seam welding apparatus|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    CH00809/17A|CH713905B1|2017-06-21|2017-06-21|Method for detecting quality defects on a longitudinal weld seam in the production of containers from sheet metal and device for carrying out the method.|CH00809/17A| CH713905B1|2017-06-21|2017-06-21|Method for detecting quality defects on a longitudinal weld seam in the production of containers from sheet metal and device for carrying out the method.|
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