• 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 present application relates to a control method, when tightening a threaded fastener, that the clamping is performed on complete threads of the fastener. For this, the method consists in detecting different slopes on a clamping curve representing a torque as a function of another parameter and for comparing each slope with predetermined values. Depending on the detected curve portions and their slope value, it is possible to determine whether the clamping is correct and has taken place on the complete threads of the fastener or on the contrary to be able to identify a cause of failure.
    公开号:FR3030737A1
    申请号:FR1552240
    申请日:2015-03-18
    公开日:2016-06-24
    发明作者:Patricia Morgue；Manuel Paredes；Sophie Gourdon；Simon Dols
    申请人:Airbus Operations SAS；
    IPC主号:
    专利说明:

    [0001] The present application relates to a method of automatic control of fastening during installation, in particular of threaded fastening, and more specifically a method of controlling a complete threaded grip when clamping an assembly. The controls usually performed are often insufficient to ensure the quality of an assembly. For example, the French patent application filed under No. 1262503 describes a method of controlling a docking. It is then a question of detecting slope variations that translate the contact between the fastener element and the parts to be assembled, a possible intermediate phase reflecting the possible presence of a prior clearance between the parts to be assembled and the tightening. It is then possible to consider that if the intermediate phase is not detected, while for example the slope of the clamping phase is correct, the docking is correct; but if this intermediate phase is detected, it is representative of a game existing between the elements to be assembled; the assembly is then correct if the clamping slope is in accordance with the expectations, otherwise, a problem related to docking is detected. The verification of the existence of these different phases makes it possible to better ensure that when the slope monitored is in accordance with expectations, it actually corresponds to the actual clamping and would not be an artifact related to a problem of assembly of the parts between they. In the case of threaded fasteners, such as a bolt, ie a screw with a nut, it is also preferable to be able to ensure that the tightening is done in properly formed threads of the screw. that is, outside of incomplete or imperfect thread regions that may be at both ends of the threaded zone of the screw shank, and that there is no contact between the nut and an area transition of the screw, that is to say the area defined on the end of the thread, before the smooth portion located between the thread and the head of the screw. In addition, it is advantageous to be able to carry out the control in real time while avoiding at best an additional intervention on the part of an operator. Currently, a control method includes the use of shims that allow the operator to control geometric parameters reflecting the correct installation of the fasteners. For this, the operator places a wedge in contact with the bolt, if the geometric criteria corresponding to the prescribed conditions are met, the wedge will not touch the elements to be controlled. However, if washers are used it happens that their diameter is insufficient for the operator to place a wedge. This involves having to disassemble the assembly to replace the washer even if the assembly was compliant. In addition, the operator generally needs to have on him a set of shims corresponding to all the diameters that he must tighten and, often, according to the different standards. To avoid a set of shims by standard it is possible to define a general shim set but this is more restrictive and therefore refuses more correct installations which, therefore, requires more disassembly.
    [0002] The present invention aims at providing an improved control method further leading to other advantages. For this purpose, is proposed, in a first aspect, a method of controlling a full threaded grip when clamping an assembly comprising at least a first piece and a second piece and a threaded fastener, formed of a first element and a second element, the method comprising at least the following steps: - a step of measuring at least one of a pair of tightening torque and a reaction torque in the threaded fastener while maintaining one still elements of the threaded fastening, - a step of measuring another parameter, different from the torque, preferably a time, an axial displacement or an angle of rotation between the first and the second element, - a step of determining a function representing an evolution of the torque relative to the other parameter for torque values between 0 and a final value of torque, a step of analyzing the function comprising: an identification step portions of the function, said portions forming together the function, and their respective slope value; - a step of comparing the slope value of each function portion with each of the previously determined slope values of a first theoretical and / or experimental reference function characteristic of a faultless correct installation and with each of the previously determined slope values of a second theoretical and / or experimental reference function characteristic of an incorrect installation with tightening on nets imperfect, and - a verification step, comprising: - a verification that the slope value of a function portion is zero, this function portion forming a non-zero plateau on values of the other parameter, - a verification that the slope value of a last function portion, defined after the plateau portion for pairs at least equal to the orple of the tray portion, is equal to a slope value characteristic of a correct installation, - a check that none of the values of the slope of the function portions defined after the plateau portion is equal to a slope value of the second reference function corresponding to a clamping on imperfect threads, and if at least one of the verifications of the verification step is not validated, the method comprises an informing step that the tightening is performed incorrectly .
    [0003] Here we mean that a check is validated that the verified criteria are met. Such a method thus makes it possible not only to check whether the tightening is correct but also that it is actually performed on the complete threads of the threaded fastener. The method thus enables a real-time control during tightening and thus makes it possible to avoid a control step after installation, which entails a possible saving of time. Moreover the operator does not need to have on him a set of shims corresponding to all the diameters which he must tighten. An additional intervention on the part of the operator is thus also avoided.
    [0004] According to an exemplary implementation, the verification step comprises a verification of an existence of a first function portion, this first function portion being prior to the function portion forming the plate, and a verification that the first portion of function has a positive slope, that is to say non-zero.
    [0005] According to an exemplary implementation, the step of identifying portions of the function comprises the following steps: a step of determining a first inflection point corresponding to an initial torque value; say the torque value from which the measurement is initiated, namely 0 or any other torque value - and a last inflection point corresponding to a final torque value - that is to say the torque value at which the measurement is stopped, - a step of finding and determining at least one intermediate point of inflection, included in the first point of inflection and the last point of inflection, - a step of definition of a portion of function between two consecutive inflection points, a step of linear extrapolation of each function portion, a step of calculating a slope value characterizing each linear extrapolation of each function portion. According to an exemplary implementation, the verification step includes a check that there are at most two function portions after the plateau portion, and if this verification is not validated, the method comprises a step of information that there is a risk of incorrect tightening. According to an exemplary implementation, the method comprises: a step of measuring the tightening torque and the reaction torque; a step of comparing the tightening torque and the reaction torque with at least one experimentally predetermined reference case; and / or theoretically, and If the comparison step is not validated - that is, if the torque and the reaction torque differ from the corresponding reference values of the reference case beyond a tolerance range associated, for example plus or minus 10% or 5% around the reference value considered - the method comprises an alert step that the clamping is not in conformity.
    [0006] For example, it is then excessive torque that comes from a contact between a nut and a screw in the transition zone, the warning step then preventing damage to the fastener. The object of the present application will be better understood and its advantages will appear better on reading the detailed description which follows, with reference to the appended figures in which: FIGS. 1 a) and 1 b) illustrate the two ends of a thread 2 schematically represents a contact between a nut and a threading transition zone of the screw, FIG. 3 schematically shows a clamping curve comprising different portions corresponding to different phases that may appear during a tightening, a contact in the transition zone occurring after effective clamping, Figure 4 schematically shows a clamping curve comprising different portions corresponding to different phases that can occur during a clamping in which case a contact in the transition zone occurs before a clamping once a gap between the plates is filled, Figure 5 illustrates a first tightening s where a contact in the transition zone occurs before an effective clamping, without play, Figure 6 illustrates a second clamping case, in which a contact in the transition zone occurs without the actual tightening has been achieved, FIG. 7 shows a comparison between a function representing a reaction torque measured in the screw (in dotted lines) and a function representing the clamping curve corresponding to the case of FIG. 3 (in solid lines), and FIG. 8 schematically shows a curve. clamping device comprising different portions corresponding to different phases that may appear during a tightening in which case appears a plasticization of the assembly. In the context of threaded fasteners, such as for example a bolt, that is to say a screw with a nut, it is advantageous to be able to ensure that the tightening is carried out in properly formed threads of the screw. that is, outside of incomplete or imperfect thread regions which may be at both ends of the threaded zone of the screw shank, and that there is no contact between the nut and an area transition of the screw, that is to say the area defined on the end of the thread, before the smooth portion located between the thread and the head of the screw. In other words, it is preferable that 1) only the complete threads are engaged with the nut and that 2) there is no contact between the nut and the transition zone of the screw. This ensures the performance of the assembly. Indeed, the nets may be incomplete or imperfect at both ends of the threaded zone. The first condition thus makes it possible to check the braking of the nut (its resistance to loosening). Indeed, to better enable the braking of the nut, it is possibly slightly deformed during manufacture. The additional friction exerted by this deformation in contact with the threads of the screw prevents the nut from loosening prematurely. If the thread in front of the nut is not complete, the friction exerted is less. There may be a risk of loosening under vibration. For braking to be as effective as possible, the contact area between the nets must be as large as possible, hence this first condition. This results in the creation of a torque, the braking torque, that the operator must add in addition to the useful torque. This torque increases during tightening, as new perfectly formed threads are engaged, up to a threshold value when all threads of the nut are engaged with perfect threads. This aspect can be verified visually during assembly, when the first thread of the screw opens out of the nut. In addition, in the end of the thread (towards the head of the screw, shown in Figure 1b)) the bottom of the imperfect threads is shallower than for the rest of the threading. Thus, if the tightening continues in this area, the threads of the nut will come into contact with the thread bottom of the screw and deform, as is illustrated for example in FIG. 2. These nets correspond to the zone transition of the screw, which is between the properly threaded portion and the smooth portion of the screw shank. If the nut is not correctly selected, there is a risk that the transition zone of the screw will contact the nut. These different phases are reflected, for example visually on a curve representing an evolution of the torque, for example the tightening torque, as a function of another tightening parameter, such as angle, time, displacement or deformation. . Such a curve is illustrated in Figure 3 which shows the tightening torque (ordinate) as a function of the angle (abscissa). In the present description, to illustrate the method that is the subject of the present application, the torque / angle relationship is used, but this description remains valid for any other measurable duo, whether the tightening torque or a reaction torque in the threaded fastener by holding one of the elements of the threaded fastener stationary: torque / time, torque / displacement or other. The curve of FIG. 3 here comprises five portions, numbered from 1 to 5, which represent the following phases: The first portion, or portion 1, is the portion starting from a first point of inflection A formed by the point of coordinates (0, 0), that is, the origin of the curve. On this portion, the torque increases until reaching a value Cl which corresponds to a braking torque. This portion 1 represents a braking of the nut when it is threaded on the screw, until all the threads of the nut are engaged with complete threads of the screw. The second portion, or portion 2, is the portion representing a plateau. This plate extends for different abscissa values, here angle, for a substantially constant torque value worth the braking torque Cl. The second portion which forms a plateau appears after the portion 1. This portion corresponds to a right of way threads of the nut on the complete threads of the screw, before the tightening of the assembly, represented by the portion 3, does not begin. The presence of a plate makes it possible to ensure that the braking has reached its nominal value and therefore, that the first imperfect threads have come out of the nut. In order for the braking value to be reached, all the threads engaged in the braked part must be correctly formed. The third portion, or portion 3, is located after the portion 2, or even after the portion 4 if a portion 4 exists. Portion 3 is the portion representing the effective clamping. The fourth portion, or portion 4, if it exists, is located between the portion 2 and the portion 3. It is the portion representing a possible catch-up between the parts to be assembled. Thus, in the absence of play between the parts to be assembled for example, the portion 4 does not appear on the clamping curve corresponding to the assembly in question. The fifth portion, or portion 5, if it exists, is for example (as is the case here) the last portion of the curve, that is to say the portion extending to a point B of torque C2 which represents a final torque value, a target torque. In Figure 3, it is located after the portion 3, but this portion is not subordinate to the previous portions. It represents here a tightening during a contact between the nut and the screw on imperfect threads of the screw, in particular on the transition zone, an over-tightening.
    [0007] The shape of the function is not known in advance, it depends on the overall stiffness of the assembly (slope corresponding to the tightening). As shown in Figure 8, it may appear that the fifth portion does not have a steeper slope than tightening but on the contrary a fall of slope, or even a horizontal asymptote. In this case, the fifth portion, then designated 5 ', reflects a plasticization of the assembly, which is also to be avoided for proper fixation. According to another example shown for example in Figures 4 and 5, it is also possible for the portion 5 to appear before the portion 3, for example between the portions 4 and 3, or 2 and 3 in a case without play. at least the aforementioned conditions when performing an assembly, a control method comprises for example the following steps: - a step of measuring a torque, for example here the tightening torque, but it could of course s' act of the reaction torque in the threaded fastener, - a step of measuring another parameter, different from the torque, preferably a time, an axial displacement or an angle of rotation between the first and the second element, - a step determining a function representing an evolution of the torque relative to the other parameter for any torque value between an initial value, which can be 0 in a particular case where the measurements are made from the very beginning of e assembles it, and a final value of torque, at which the measurement is stopped, - a step of analyzing the function comprising: - A step of identifying portions of the function, the set of portions forming the function , and their respective slope value, - a step of comparing the slope value of each function portion with each of the slope values of a first predetermined theoretical and / or experimental reference function and characteristic of an installation correct without defects and with each of the slope values of a second predetermined theoretical and / or experimental reference function characteristic of an incorrect installation with tightening on imperfect nets, - a verification step, comprising: - optionally, according to the torque from which the measurements begin to be made, a verification of the possible presence of a portion of function having a positive slope, non-zero, which would be then before a plateau portion; this portion corresponding in this case to the first aforesaid portion, - a verification that the slope value of a function portion is zero, this function portion forming a non-zero plateau on values of the other parameter, verifying that this portion corresponds to the braking of the nut on complete threads of the screw, that is to say to the portion 2 above, - a check that the value of slope of a portion of function, defined between after the portion of function forming a plateau and the final torque for torques at least equal to the torque of the plateau portion, is equal to a tightening value of the reference curve corresponding to a correct tightening, to verify that a clamping phase has actually taken place , this portion then corresponding to the portion 3 above, - optionally, a verification that the slope value of a possible portion of function defined between the portion of the plateau function (the portion 2) and the portion 3, is not equal to a clamping value of the reference curve corresponding to a tightening on imperfect nets, this portion then corresponding to the portion 4 above, and - a verification that the curve portion corresponding to the portion 3 comprises the final torque, to verify that the clamping phase is the last phase implemented and that, for example, an over-tightening phase does not intervene thereafter.
    [0008] If the verifications of the verification step are validated, the method includes a validation step that the tightening is performed correctly on the complete threads of the threaded fastener. Here, checking whether a slope is equal to a predetermined value implies verifying that the slope is at least within a range or a tolerance zone around this value, for example +/- 5%. This is of course valid for any verification of the values with respect to predetermined values, theoretically and / or experimentally. By using the slope changes of the curve it is thus possible to describe the different events that occurred during the tightening. The method thus allows a control, that is to say a detection and monitoring, of certain phases corresponding to different portions of curves to interpret the function in order to know the state of the assembly.
    [0009] If the aforementioned verifications are not validated, then the method may comprise an information step that the tightening is not correct, and moreover, by comparing the different detected portions with predetermined values, it is possible to identify a cause of the problem. In other words, depending on the detected phases, that is to say the identified function portions, it is then possible to know whether the assembly is correctly performed in the threads of the threaded fastener or to be able to identify a cause resulting in an assembly problem. The method thus makes it possible to focus on the behavior of the threads in engagement.
    [0010] The identification of the different slopes as well as the associated comparisons are done for example by means of an algorithm. This can, for example, be directly integrated into a tool of the clamping device or a control unit or other. Thus, a response in the form of a signal, which can be light, sound or digital or a combination thereof, can be transmitted directly to the operator, indicating whether all the controlled parameters are valid and therefore the clamping correct.
    [0011] Thanks to the method, observing the variations of successive slopes and comparing the value of the steering coefficient with a reference value makes it possible to dispel contentious cases. An example of a contentious case is given in FIG. 5. The curve of FIG. 5 comprises two portions beyond the plateau of portion 2 (portions 1 and 2 being more easily identifiable, they are not discussed in the context of FIG. this example). By comparing the slope values of these two portions with theoretical and / or experimental values, it is possible to determine that these two portions correspond successively to a clamping phase on the transition zone and then to a tightening phase. Otherwise, it would for example be possible to confuse them with, respectively, a catch-up phase and a tightening phase; in which case it could be concluded that the clamping is correct, when in fact, this case corresponds to an assembly initially without mounting clearance, in which the clamping was carried out in the transition zone of the screw, and is by therefore non-compliant. Another example of a contentious case is given in FIG. 6. The curve of FIG. 6 comprises a portion beyond the plateau of portion 2 (portions 1 and 2 remaining more easily identifiable, nor are they discussed in FIG. the framework of this example). In addition to the fact that it is possible to determine that the clamping is not correct because the slope that this portion is different from the expected clamping value, it is possible to determine a reason why the clamping is not in conformity. This could for example be due either to the fact that a game is not filled between the parts to be assembled before the target torque C2 is reached, or because the tightening takes place on the transition zone of the screw. In this case, it is a case where the nut comes into contact with the transition zone without touching the parts to be clamped. It can for example be deduced that the screw was poorly formed or badly chosen, its flat area between the threaded portion and the head being for example too long.
    [0012] In general, if the first portion or the second portion is not detected or they are detected but their slope does not correspond to expectations, then the method may include an information step indicating that there is has a problem of assembly, or even for example of threading of the threaded fastener or excessive play exists between the elements to be assembled. Optionally, the verification step includes a prior verification that the function comprises at least three portions, the method comprising the validation step if this verification is validated. In addition or instead, the verification step may also include a prior verification that the function is monotonic and increasing, that is to say that the slope at any point is equal to or greater than zero, the method comprising validation step if this verification is validated. Indeed, if the curve has any drop in torque, it can also reflect a problem in the assembly and the operator can be notified. Thus, in the present method, the entire clamping curve is exploited and not only the portion corresponding to the actual clamping of the assembly.
    [0013] According to an exemplary implementation, the method comprises a step of detecting a first positive first slope curve portion for all torque values between 0 and a torque value called non-zero braking torque value, this first portion corresponding to the braking of the second element during its threading on the first element, a step of detecting a second curve portion, following the first curve portion, of second zero slope, forming a non-zero plateau on values of the other parameter, for torque values equal to the braking torque value and a detection step of at least a third curve portion, subsequent to the second curve portion, of a third positive positive slope at a predetermined clamping value, for torque values between a first torque value, at least equal to the braking torque value, and a second value torque value, greater than the first torque value. The method then furthermore possibly includes a verification step that the first portion has been detected, a verification step that the second portion has been detected, a verification step that a third portion whose third slope is equal to the value of predetermined clamping has been detected and a verification step that the second torque value is equal to the target torque value. For example, the step of identifying portions of the function comprises the following steps: a step of determining a first inflection point corresponding to an initial torque value, or even 0 if the measurements are carried out as soon as the beginning of the assembly, and a last inflection point corresponding to a torque value equal to the final value of torque, - a step of finding and determining at least one intermediate inflection point, included in the first inflection point and the last inflection point, - a step of defining a function portion between two consecutive inflection points, - a step of linear extrapolation of each function portion, - a step of calculating a slope value characterizing each linear extrapolation of each function portion. According to an exemplary implementation, the method comprises a step of calculating the torque of the second function portion, that is to say of the plateau portion (which may be the first detected if the measurements are not performed at during the phase corresponding to the first portion), a step of comparing the torque value of the second portion with a braking torque value of the predetermined theoretical function and / or a non-zero reference experimental value, and the verification step further includes checking that the torque value of the second portion is within an interval about the reference braking torque. The method then comprises the aforementioned validation step if this verification is also validated. This step thus makes it possible to better ensure that the plate effectively corresponds to the braking of the nut on complete threads of the screw.
    [0014] In order to verify whether there exists a "fourth" portion actually corresponding to a clearance adjustment between the parts to be assembled, the method may comprise a verification step that a portion, called the fourth portion, has been defined between the second portion and the third portion, that is to say between the plate and the effective clamping, and if a fourth portion has been identified between the second portion and the third portion, the verification step then comprises a check that the slope of the fourth portion is not equal to a clamping value in the imperfect threads and if this verification step is validated, the method comprises an informing step that the fourth portion corresponds to a play catch between at least the first piece and the second piece to assemble. Another assembly problem may also be related to the fact that the tightening phase may not take place. In this case, checking that the slope value of the last portion is equal to a clamping value of the predetermined reference function is not validated. It is then interesting to be able to identify why this phase could not take place. If necessary, it is then advantageous that the verification step comprises a verification that the slope of the last portion is equal to the value of the reference slope corresponding to the tightening beyond the threads and if this verification step is validated , the method comprises an informing step that the tightening is incorrect and made beyond the threads. Thus, depending on the different portions of curves identified and the value of their slope, it is possible to ensure that the clamping has been correctly established, whether it has taken place in the threads of the binding, or what are possible causes of failure. To implement this method, one possibility is to instrument a clamping device which, during the tightening of a threaded fastener, measures parameters related to tightening, such as torque, angle, time, displacement. or deformation. One option is to instrument an element holding the screw (immobilizer, key or other) in order to determine the reaction torque passing through it. This torque is related to the interactions between the nut and the screw, it is a direct representation of the braking and the contact between the nut and the transition zone of the screw if it takes place. The measurement of this torque also gives an indication of the coefficient of friction in the thread. Of
    权利要求:
    Claims (5)
    [0001]
    REVENDICATIONS1. A method of controlling a complete threaded grip when clamping an assembly having at least a first piece and a second piece and a threaded fastener formed of a first member and a second member, the method comprising at least the following steps: - a step of measuring at least one of a pair of tightening torque and a reaction torque in the threaded fastener while holding one of the elements of the threaded fastener stationary, - a measuring step of another parameter, different from the torque, preferably a time, an axial displacement or an angle of rotation between the first and the second element; a step of determining a function representing an evolution of the torque relative to the another parameter for torque values between 0 and a final torque value, - a step of analyzing the function comprising: a step of identifying portions of the function, said portions forming together the function, and their respective slope value, - a step of comparing the slope value of each function portion with each of the previously determined slope values of a first theoretical and / or experimental characteristic reference function. of a correct installation without defects and with each of the previously determined slope values of a second theoretical and / or experimental reference function characteristic of an incorrect installation with clamping on imperfect nets, and a verification step, including: - a check that the slope value of a function portion is zero, this function portion forming a non-zero plateau on values of the other parameter, - a verification that the slope value of a last portion of function, defined after the plateau portion for couples at least equal to the pair of the plateau portion, is equal to one slope value characteristic of a correct installation, - a verification that none of the values of the gradients of function portions defined after the plateau portion is equal to a slope value of the second reference function corresponding to a tightening on nets imperfect, and if at least one of the verifications of the verification step is not validated, the method includes an informing step that the tightening is performed incorrectly.
    [0002]
    2. Method according to claim 1 wherein the verification step comprises a verification of an existence of a first function portion, this first function portion being prior to the function portion forming the plate, and a verification that the first function portion has a positive slope.
    [0003]
    3. Method according to any one of claims 1 or 2 wherein the step of identifying portions of the function comprises the following steps: - a step of determining a first inflection point corresponding to a torque value initial and a final inflection point corresponding to a final torque value, - a step of finding and determining at least one intermediate inflection point, included in the first inflection point and the last point of inflection, - a step of defining a function portion between two consecutive inflection points, - a step of linear extrapolation of each function portion, .- a step of calculating a slope value characterizing each linear extrapolation. of each function portion.
    [0004]
    4. Method according to any one of claims 1 to 3 wherein the verification step comprises a verification that there is at most two functional portions after the plateau portion, and if this verification is not validated, the method comprises an informing step that there is a risk of incorrect clamping.
    [0005]
    5. Method according to any one of claims 1 to 4 comprising: - a step of measuring the tightening torque and the reaction torque, - a step of comparing the tightening torque and the reaction torque with at least one case of predetermined reference experimentally and / or theoretically, and If the comparison step is not validated, the method includes an alerting step that the clamping is not in conformity.
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    同族专利:
    公开号 | 公开日
    FR3030736A1|2016-06-24|
    FR3030736B1|2017-02-10|
    EP3040163A1|2016-07-06|
    FR3030737B1|2017-02-03|
    BR102015032063A2|2016-07-12|
    CN105758578A|2016-07-13|
    CN105987782A|2016-10-05|
    EP3040163B1|2017-09-20|
    US9500544B2|2016-11-22|
    CA2915711A1|2016-06-23|
    US20160187213A1|2016-06-30|
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    CN103217278B|2013-01-05|2015-09-02|北京工业大学|A kind of method of testing high-strength bolt faying face normal direction static characteristics|
    FR3030736B1|2014-12-23|2017-02-10|Airbus Operations Sas|METHOD FOR MONITORING A FULL NET SQUARE WHEN TIGHTENING AN ASSEMBLY|FR3030736B1|2014-12-23|2017-02-10|Airbus Operations Sas|METHOD FOR MONITORING A FULL NET SQUARE WHEN TIGHTENING AN ASSEMBLY|
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    法律状态:
    2016-03-21| PLFP| Fee payment|Year of fee payment: 2 |
    2016-06-24| PLSC| Search report ready|Effective date: 20160624 |
    2017-03-22| PLFP| Fee payment|Year of fee payment: 3 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1463258A|FR3030736B1|2014-12-23|2014-12-23|METHOD FOR MONITORING A FULL NET SQUARE WHEN TIGHTENING AN ASSEMBLY|CA2915711A| CA2915711A1|2014-12-23|2015-12-18|Monitoring process for the grip of entire meshes when tightening an assembly|
    US14/978,711| US9500544B2|2014-12-23|2015-12-22|Process for checking that full threads are engaged in tightening and assembly|
    EP15202130.9A| EP3040163B1|2014-12-23|2015-12-22|Method of verifying the engagement of complete threads on tightening an assembly|
    CN201610151921.7A| CN105987782A|2014-12-23|2016-03-17|Process for controlling full thread engagement in tightening of assembly|
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