EP4171882A1 - Dispositif de cautionnement d'assemblages visses et procede mettant en oeuvre le dispositif - Google Patents
Dispositif de cautionnement d'assemblages visses et procede mettant en oeuvre le dispositifInfo
- Publication number
- EP4171882A1 EP4171882A1 EP21737467.7A EP21737467A EP4171882A1 EP 4171882 A1 EP4171882 A1 EP 4171882A1 EP 21737467 A EP21737467 A EP 21737467A EP 4171882 A1 EP4171882 A1 EP 4171882A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- torque
- angle
- assembly
- screwdriver
- operator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
- B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
- B25B23/147—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for electrically operated wrenches or screwdrivers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING
- B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
- B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
- B25B23/145—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers
- B25B23/1456—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for fluid operated wrenches or screwdrivers having electrical components
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Program-control systems
- G05B19/02—Program-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of program data in numerical form
- G05B19/182—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of program data in numerical form characterised by the machine tool function, e.g. thread cutting, cam making, tool direction control
- G05B19/186—Generation of screw- or gearlike surfaces
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Program-control systems
- G05B19/02—Program-control systems electric
- G05B19/418—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
- G05B19/41805—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by assembly
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/31—From computer integrated manufacturing till monitoring
- G05B2219/31027—Computer assisted manual assembly CAA, display operation, tool, result
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/31—From computer integrated manufacturing till monitoring
- G05B2219/31034—Component identifier and location indicator corresponding to component
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/45—Nc applications
- G05B2219/45127—Portable, hand drill
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/49—Nc machine tool, till multiple
- G05B2219/49196—Screw
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Definitions
- the invention relates to a screw connection bonding device and a method using the device.
- various mechanical parts are assembled and the assemblies are often held in position by means of screws.
- the formalization of the proper execution of assembly operations is one of the requirements, particularly in the aeronautical and military fields.
- the assemblies are carried out manually by operators. It is customary to provide a bond for screwed assemblies, by placing on each assembly element, screw or nut, a colored mark after checking that the element in question is correctly installed. This color mark is usually made using a colored varnish. The color mark is registered by an operator dedicated to monitoring or by the operator himself when he is trained in self-monitoring. In practice, this type of bond cannot be provided for all assemblies. In particular, it is not acceptable to have this type of color mark on the front panels of equipment, for example on an aircraft dashboard. In addition, the operation of applying a color mark requires application and drying time. This operation is a source of further human error.
- the bond provided by an operator makes it possible to have a moral commitment from the operator but no does not really offer a guarantee that the assembly operation has been carried out correctly. To demonstrate that the screwed assembly operation has been carried out correctly, it is necessary to disassemble the assembly.
- the invention aims to overcome all or part of the problems mentioned above by providing means of ensuring that a screwed assembly produced by an operator is done correctly. More precisely, the invention makes it possible to ensure that a threaded assembly element is correctly placed. In addition, the invention makes it possible to ensure the correct choice of the element in the screwed assembly.
- the invention relates to a device for producing and guaranteeing screwed assemblies
- a screwdriver intended to be operated by an operator, and computer equipment connected to the screwdriver, the screwdriver being equipped with sensors measuring device delivering information representative of the torque operated by the screwdriver and of a rotation angle operated by the screwdriver, the computer equipment having in a memory, reference data relating to a screwed assembly to be produced, the computer equipment being configured to compare representative information of angle and torque measured during assembly with the reference data, and to inform the conformity of the angle and torque measurements against the reference data, the reference data containing a docking torque associated with a docking angle of several turns associated with a tolerance, the docking torque and the docking angle corresponding to l at the end of a phase of the assembly called the approach phase and a tightening torque associated with a tightening angle, the docking torque being less than the tightening torque of the screwed assembly.
- the reference data contains a minimum torque used to start the angle measurement of the approach phase, the minimum torque being less than the docking torque.
- the device advantageously further comprises a first presence detector connected to the computer equipment and arranged near a set of lockers containing various threaded assembly elements, the first presence detector being configured to detect the locker in in which the operator chooses one of the threaded fasteners to perform the assembly, the computer equipment being configured to compare the bin in which the operator has chosen the threaded fasteners with a predefined bin in memory and to inform of the conformity of the choice of the operator.
- the device advantageously further comprises a second presence detector connected to the computer equipment and arranged near a space reserved for the production of screwed assemblies and configured to detect the positioning of a threaded assembly element in a screwed assembly in progress, the computer equipment being configured to compare a positioning carried out by the operator with a predefined positioning in the memory and to inform of the conformity of the carried out positioning.
- a second presence detector connected to the computer equipment and arranged near a space reserved for the production of screwed assemblies and configured to detect the positioning of a threaded assembly element in a screwed assembly in progress, the computer equipment being configured to compare a positioning carried out by the operator with a predefined positioning in the memory and to inform of the conformity of the carried out positioning.
- the device can be adapted to the production of an assembly using several threaded assembly elements, the reference data then advantageously contains an order in which the threaded assembly elements must be mounted, the second detector of presence and the computer equipment being configured to detect an order in which the threaded fasteners are mounted by the operator, to compare the order executed by the operator to the predefined order in the reference data and to inform the conformity of the order executed by the operator.
- the reference data advantageously contains several acceptable orders for mounting the threaded assembly elements of the same assembly, the computer equipment then being configured to inform compliance if the order executed by the operator corresponds to one of the acceptable orders predefined by the reference data.
- the subject of the invention is also a method for producing and guaranteeing screwed assemblies using a device comprising a screwdriver intended to be operated by an operator, and computer equipment connected to the screwdriver, the screwdriver being equipped with measurement sensors delivering information representative of the torque operated by the screwdriver and of a rotation angle operated by the screwdriver, the computer equipment having in a memory, reference data relating to a screwed assembly to be produced, the process consists in :
- the method consists in starting the docking angle measurement when the measured torque exceeds a minimum torque lower than the docking torque.
- the device may further include a first presence detector connected to the IT equipment and arranged near a set of lockers containing various threaded assembly elements, the process then consisting of:
- the device may further comprise a second presence detector connected to the computer equipment and arranged near a space reserved for the production of screwed assemblies and configured to detect the positioning of a threaded assembly element. in a screwed assembly in progress, the process then consisting in:
- Figure 1 shows an example of a bonding device according to the invention
- Figure 2 shows an example of a torque measurement made by a screwdriver of a device according to the invention as a function of the angle of rotation of the screwdriver when mounting a screw;
- Figure 3 shows an example of a configuration of a device according to the invention for verifying the compliance of a screwing operation performed by the screwdriver visible in Figure 2;
- FIG. 4 represents a sequence of operations during an assembly phase of mechanical parts
- Figures 5a and 5b show two examples of desirable order for two screw connections.
- Figure 1 shows two mechanical parts 10 and 12 intended to be assembled by means of several screws. It is understood that the invention can also be implemented for any other threaded assembly component, such as a nut, a stud, etc. Subsequently, the description will be given in relation to the implementation of screw. It will be easy to apply the invention to other threaded assembly components.
- the assembly of the two parts 10 and 12 is in progress.
- a screw 14 is already in place and another screw 16 is being assembled.
- Bores 18 made in part 12 and corresponding threads are made in part 10.
- the threads are not visible because they are hidden by part 12 which covers them.
- the screws 14 and 16 freely pass through the holes 18 to fit into the threads of the part 10.
- the assembly is carried out by an operator. More precisely, the operator poses the part 12 on part 10 by making the holes 18 correspond to the tapped holes, then insert the screws into the holes and finally screw in the screws.
- FIG. 1 also shows a device 20 for producing and securing screwed assemblies.
- the device 20 comprises a screwdriver 22 intended to be operated by the operator and computer equipment 24 connected to the screwdriver 22.
- the connection of the screwdriver 22 and the computer equipment 24 can be achieved by various means, for example wire.
- the connection can also be carried out wirelessly, for example by means of a short-distance radio link in order to improve the freedom of movement of the screwdriver 22 with respect to the computer equipment 24.
- the screwdriver 22 can have an autonomous power supply. for example carried out by means of an on-board battery.
- the screwdriver 22 is equipped with a tip 26 configured to rotate the screw 16.
- the screwdriver 22 can be driven by any source of energy, for example electric or pneumatic, making it possible to drive the rotation of the tip 26 to ensure the screwing.
- the screwdriver 22 is equipped with sensors delivering information representative of the torque operated by the screwdriver 22 and of an angle of rotation thereof. Both torque and angle information can be measured independently.
- An angle sensor 28 can measure the rotation of the end piece 26 during the assembly of the screw 16. To carry out the assembly of the screw 16, the operator inserts the end piece 26 on the head of the screw 16 then operates a switch. of the screwdriver 22 until the screw 16 is tightened. The rotation of the bit 26 can be measured by the sensor 28 as long as the operator maintains the switch in the position where the screwdriver 22 drives the bit 26.
- a sensor torque 30 measures the torque operated by the tip 26 on the screw 16.
- the torque measurement is compared to a setpoint torque stored in the computer equipment 24 and makes it possible in particular to check that a required tightening torque has been reached. .
- This torque is generally reached at the end of the screwing operation when the screw 16 is tightened.
- the torque is proportional to the current consumed by a motor driving the end piece 26.
- the measurement of the current therefore makes it possible to find the couple operated by the screwdriver.
- the torque can be measured by other types of sensors. It is the same for the angle sensor. It is possible to find the angular position of the end piece 26 relative to the body of the screwdriver 22, for example by means of an optical encoder or by means of measurements.
- torque sensor and angle sensor will be used hereinafter, respectively any type of sensor making it possible to deliver information representative of the torque operated by the screwdriver and the angular position of the tip 26 relative to the body of the screwdriver 22.
- the torque and angle measurements can be combined. More precisely, the measurements are carried out by jointly measuring the torque operated for different angle values, from the start of the operation of the screwdriver switch 22 by the operator until the moment when the operator releases the switch. after tightening the screw 16.
- the angle and torque measurements can be carried out continuously or by sampling. The combined measurements make it possible to define a curve for the evolution of the torque as a function of the angle traversed by the bit 26 when driving the screw 16.
- the computer equipment 24 receives, through its connection to the screwdriver 22, information from the various sensors and in particular from the torque and angle sensors.
- the computer equipment 24 has, in a memory, reference data, in particular relating to the mounting of the screw 16 and of course relating to the mounting of all the screws ensuring the assembly of the mechanical parts 10 and 12.
- the computer equipment 24 is configured to compare the angle and torque measurements made by sensors 28 and 30 during assembly with the reference data.
- the computer equipment 24 is also configured to inform of the conformity of the measurements with respect to the reference data. This conformity represents the guarantee of the assembly of the screw 16.
- the computer equipment 24 can immediately emit an alarm warning the operator of the non-conformity in order to allow him to remedy it without delay and beforehand. move on to fitting another screw.
- FIG. 2 shows an example of a torque curve operated by the screwdriver 22 as a function of its angle of rotation during the screwing operation of the screw 16.
- the evolution of the torque C as a function of the angle a is represented by a curve 36 obtained when the torque and angle measurements are combined.
- the original value of the angle a can be defined by the operator when he triggers the rotation of the screwdriver 22 or again when the contact sensor 32 detects the presence of the screw 16.
- the screwing operation can be divided into several phases. At the start of rotation of the screwdriver 22, the screwdriver accelerates then its speed and its torque stabilize until a torque C1 is reached for an angle a1.
- the screw 16 is not yet inserted into the threads of the tapping.
- the screw 16 enters the tapping and makes several turns in a so-called approach phase without the tightening being effective.
- the approach phase ends at the angle a2 when the head of the screw 16 comes into contact with the part 12 possibly via a washer. More generally, the approach phase ends when all the mechanical parts, including the screw, are in contact before the tightening of the assembly is effective.
- the approach phase can be of the order of ten turns which correspond to the length of thread engaged in the corresponding thread. This length is often chosen between 1 and 3 times the nominal diameter of the screw considered.
- the torque exerted by the screwdriver 22 may increase slightly in a transient manner, passing through a maximum CM1.
- This is a parasitic torque due to the alignment of the screw 16 with the axis of the tapping.
- the CM1 torque is sometimes called the recovery torque.
- the torque is substantially constant and takes a value C2 on the curve of FIG. 2.
- the torque can also be slightly increasing due to the friction between the screw and its internal thread, the friction increases with the number of threads engaged between the screw and the tapping.
- the screwdriver 22 can be controlled to maintain a constant speed.
- the end of the approach phase is also called: "berthing".
- Docking can be detected by an increase in torque exerted by the screwdriver shown in figure 2 as a maximum CM2.
- the value of the torque exerted by the screwdriver when docking must be sufficient to crush any spring washers present in the assembly and to flatten the mechanical parts present even in the event of a lack of flatness within acceptable tolerances.
- the value of the torque exerted by the screwdriver on docking must not be too high to allow the screwdriver to be restarted after the approach phase.
- the value of the docking torque CM2 can be of the order of 40% of the tightening torque. This value is of course to be adapted according to the type of screwdriver used and the various mechanical parts present in the assembly.
- the screwdriver can be controlled at torque C3, for example for an electric screwdriver by controlling the current it consumes.
- the change of control can cause the driver to stop driving the screwdriver and a drop in torque visible in figure 2 just after the angle a2.
- the torque increases while restarting the screwdriver 22 until the tightening torque C3 is reached.
- the angle scale is not respected.
- the rotation of the screwdriver 22 between the angles a1 and a2 can be several turns, or even ten turns.
- the rotation of the screwdriver 22 between the angles a2 and a3 may be less than a quarter turn.
- Figure 3 shows the configuration of the computer equipment 24 to check the compliance of the mounting of the screw 16.
- the computer equipment 24 receives information representative of angles and torques originating from the sensors, respectively 28 and 30.
- the computer equipment 24 comprises a memory 40 containing reference data relating to the tightening operation.
- the reference data contains expected torque and angle values for mounting screw 16.
- the reference data may contain ranges of values. For example, for torque C3, a value range of +/- 10% may be acceptable. All of these ranges form tolerances within which the tightening operation is considered to have been correctly performed.
- the computer equipment 24 includes a comparator 42 configured to compare the measurements from the sensors 28 and 30 with the reference data.
- the result of the comparison can take two forms 44 and 46, either the measured values are within the prescribed tolerances, the tightening operation is considered compliant and the digital guarantee 44 is validated, or the measured values are within the prescribed tolerances. 'Outside the prescribed tolerances, the tightening operation is considered non-compliant and an alert 46 is issued. This alert informs the operator of the non-compliance.
- a non-conformity can have several causes such as in particular a manufacturing defect in one of the parts 10 or 12 or even of the screw 16. Another cause can be the installation of a bad screw.
- the alert 46 advantageously invites the operator to review the assembly, in particular by carrying out the screw fitting and screwing operations again.
- the torque and angle measurements can be measured independently or in combination in order to form the curve of FIG. 2, at least by sampling.
- the measurements are carried out independently, it is for example possible to take an interest in the tightening torque C3 and the corresponding angle a3. These two measurements are obtained at the end of the tightening operation.
- the measurements are carried out in a combined manner, it is possible to compare the curve formed by all the measurements carried out with a template contained in the reference data. It is thus possible to discriminate more precisely the cause of a nonconformity. For example a too low value of the angle a2 can inform about a too short screw not having a sufficient number of threads engaged in the corresponding tapping of the part 10.
- a too high value of the angle a2 allows to alert on the implementation of a too long screw. Too great a value of the torque C2 can inform about a screw badly engaged in its tapping and running the risk of causing deterioration of the tapping. More generally, an excessively high coefficient of friction between the screw and the tapping resulting in an excessively high torque value C2 will result in too low angle values a2 and a3. In other words, checking the conformity of the approach phase makes it possible to remedy a large number of faults in the various mechanical parts of the screwed assembly. Verifying the conformity of the approach phase can be carried out by measuring the angle a2 when the docking torque C2 is reached.
- the angular displacement operated by the screwdriver 22 is measured since it was started up and as long as the measured torque remains below a predetermined value, for example equal to 40% of the required tightening torque C3.
- This predetermined value represents the value C2 shown in FIG. 2.
- the predetermined value can be defined empirically after several tests, in particular to take account of dispersions in the value of the torque C2.
- the predetermined value is greater than the values measured during the tests while remaining well below the required tightening torque C3.
- the angular displacement of the screwdriver, as long as the measured torque remains less than or equal to C2, must respect a predetermined angle value to which a tolerance is granted.
- This tolerance can be a function of the errors that it is desired to be able to detect in the choice of the parts of the assembly, including in the choice of the screw.
- the screws for example, according to the ISO metric standardization, there are standardized screws of diameter M3 with a length of 6, 8 and 10mm. The pitch of these screws is 0.5mm.
- a screw error for example a screw of length 6mm instead of 8mm, leads to a deviation of 4 turns in the rotation of the screwdriver. If the angular displacement operated by the screwdriver is within a tolerance of +/- 720 °, i.e. +/- 2 turns around an expected value, it is certain that the screw has been correctly chosen. It is possible to provide for the presence of a washer in the assembly.
- the measurement of the angular displacement operated by the screwdriver during the approach phase makes it possible to check whether the washer is present or absent. A missing washer will result in a too large a2 angle.
- a tolerance on the value of the angle measured with respect to the expected value makes it possible to ensure that the washer is present or absent.
- the tolerance adopted is a function of the thickness of the washer.
- the start of the approach phase can be defined when the screwdriver 22 is rotated after the screw has been placed at the entrance of the thread intended for accommodate the screw. Otherwise we can ignore the initial phase.
- the tolerance assigned to the angle a2 can take account of a possible rotation of the screw before it engages in the tapping. This rotation of the screw is generally less than one turn and can therefore be included in the example of tolerance mentioned above which is +/- 2 turns.
- the angle a1 can be detected by a slight decrease in torque between the pairs CM1 and C2.
- the tolerance on the angular displacement of the screwdriver during the approach phase could be adapted depending on the presence of ancillary parts such as washers. It is also possible to allow an operator to readjust this tolerance following angular displacement measurements outside the tolerance. In fact, in the event of a fault being detected, it is possible to provide a procedure that the operator must follow. It is in particular possible to ask him to check more specifically the presence and the dimensions of each part of the assembly. It is possible that by changing the batch in the supply of one of the parts of the assembly, certain disparities, such as for example the presence of a larger entry chamfer of the tapping than in a previous batch, lead to an apparent non-conformity of the phase approach. By slightly modifying the limits of the tolerance on the acceptable angular displacement during the approach phase, it is possible to avoid an apparent non-conformity in an assembly that is in practice compliant.
- FIG. 3 shows the elements of computer equipment necessary to verify the compliance of a screwing operation.
- This screwing operation takes place during an assembly phase of the parts 10 and 12, a phase which is described more generally with the aid of FIG. 4. More precisely, the assembly phase begins with an operation 50 of positioning. mechanical parts 10 and 12 between them. Then, the operator chooses a first screw, for example screw 14 for fixing parts 10 and 12 together during an operation 52 of choice. Then, the operator performs an operation 54 of placing the screw 14 in the hole 18 intended to receive it. At the end of the operation 54, the operator performs the screwing operation 56 using the screwdriver 22 as described above. After the screw 14 screwing operation 56, the operator repeats the sequence of operations 52, 54 and 56 for other screws, and in particular the screw 16. This sequence is performed for all the screws necessary for the assembly of parts 10 and 12.
- the operation 52 of choosing the screw can be a source of error leading to non-conformity of the assembly.
- the device of the invention makes it possible to limit this source of error.
- Different screws can be stored in a set of compartments 60 provided for this purpose. It is possible to guide the operator in his choice, by indicating to him, for example by appropriate lighting 62, the compartment in which he must take a screw. This light indication does not make it possible to verify that the operator has correctly taken the screw indicated to him.
- the detector 64 may be an optical detector disposed opposite the assembly of the set of racks 60.
- the optical detector may also be based on cutting off a light beam when the hand enters the correct bin and alerting if the hand enters a bad locker.
- the presence detector 64 can be based on other physical principles, such as for example the detection of a micro electric current flowing in the hand of the operator by connecting the locker to the earth.
- the presence detector 64 is connected to the computer equipment 24 to send it information relating to the choice made by the operator.
- the bond 44 is then validated when the choice of the operator is correct and when the measurements from the sensors 28 and 30 comply with the expected reference data.
- a presence detector 66 arranged near a space reserved for the realization of the Assembly.
- the presence detector 66 is also connected to the computer equipment 24 to send it information relating to the insertion of the screw into the correct hole in the part 12.
- the bond 44 is then validated when the screw chosen by the operator is placed in the correct location and when the measurements from sensors 28 and 30 comply with the expected reference data. This additional bond condition advantageously complements that relating to the correct choice of the screw by the operator.
- the device 20 can also make it possible to help the operator and to guarantee the order of assembly of several screws of an assembly.
- the order may be of interest when several screws secure the mechanical parts of the assembly.
- a wrong order in which the screws are mounted can lead to deformation of the mechanical parts, for example, when the mechanical parts form a channel in which a fluid is intended to pass, for example when assembling two flanges each forming the end the wrong order of mounting the screws can lead to leakage at the mating surface between the flanges even if a gasket is present. From the parts mechanics fixed, once all the screws have been tightened, it is impossible to verify that a precise order has been correctly followed by the operator. Proof of order could consist of a video recording of the fitting of all screws in the assembly.
- the invention makes it possible to guarantee the assembly at the end of the assembly of the various screws.
- An alert can be issued either at the end of assembly or directly as soon as a screw is positioned in an incorrect location so that the operator can correct the location immediately.
- the presence detector 66 can be implemented to locate the various mounted screws and to transmit this information to the computer equipment 24. Which in turn compares the order in which the operator has mounted the different screws. in a predefined order. As indicated above, a difference between the order made by the operator and the predefined order results in an alert sent by the computer equipment 24. On the contrary, in the absence of any difference, the digital guarantee is pronounced.
- FIG. 5a represents an assembly where, in a plane intersecting the axes of the screws, the positions of the screws form a rectangle.
- Figure 5b shows an assembly where the positions of the screws form a circle. It is understood that assistance to the operator and that a surety by means of a device according to the invention can be provided for any shape on which the position of the screws is inscribed. In each of the examples a correct assembly order is specified: from 1 to 10 in FIG. 5a and from 1 to 8 in FIG. 5b.
- the first screw is located at the center and at the bottom, the second screw is located at the center and at the top, the third screw is located to the right of the second and so on.
- the sequence shown is well suited to a right-handed operator: after the second screw, the operator positions a third screw located on the right.
- a left handed operator will be more comfortable positioning the third screw to the left of the second screw and so on.
- several correct orders may be admissible, the different admissible orders being able to be deduced by symmetry with a vertical axis and also with a horizontal axis if the operator places his first screw at the top and not at the bottom as shown.
- the sequences acceptable as a variant of the sequence proposed in FIG. 5b.
- the third can be on the right as shown or alternatively on the left.
- the rest of the sequence is also deduced by symmetry around an axis passing through the positions of the first two screws.
- the operator can start with any screw.
- the second screw should be diametrically opposed.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Human Computer Interaction (AREA)
- General Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2006853A FR3111830B1 (fr) | 2020-06-30 | 2020-06-30 | Dispositif de cautionnement d’assemblages vissés |
| PCT/EP2021/068047 WO2022003047A1 (fr) | 2020-06-30 | 2021-06-30 | Dispositif de cautionnement d'assemblages visses et procede mettant en œuvre le dispositif |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4171882A1 true EP4171882A1 (fr) | 2023-05-03 |
Family
ID=74125250
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21737467.7A Pending EP4171882A1 (fr) | 2020-06-30 | 2021-06-30 | Dispositif de cautionnement d'assemblages visses et procede mettant en oeuvre le dispositif |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US12528162B2 (fr) |
| EP (1) | EP4171882A1 (fr) |
| FR (1) | FR3111830B1 (fr) |
| WO (1) | WO2022003047A1 (fr) |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4104780A (en) * | 1976-12-29 | 1978-08-08 | Sps Technologies, Inc. | Method and system for tightening joint assembly |
| US5105519A (en) * | 1985-06-19 | 1992-04-21 | Daiichi Dentsu Kabushiki Kaisha | Tension control method for nutrunner |
| US5131130A (en) * | 1990-10-09 | 1992-07-21 | Allen-Bradley Company, Inc. | Torque-angle window control for threaded fasteners |
| US5549169A (en) * | 1993-01-13 | 1996-08-27 | Nippondenso Co., Ltd. | Screw tightening apparatus |
| US5637968A (en) * | 1993-10-25 | 1997-06-10 | The Stanley Works | Power tool with automatic downshift feature |
| US8676368B2 (en) * | 2009-10-19 | 2014-03-18 | Fives Cinetic Inc. | System and method for optimizing a production process using electromagnetic-based local positioning capabilities |
| DE202014105672U1 (de) * | 2014-11-25 | 2014-12-02 | Eduard Wille Gmbh & Co. Kg | Drehmoment- und Drehwinkelwerkzeug |
| DE102017008967A1 (de) * | 2017-09-26 | 2019-03-28 | Daimler Ag | Verfahren zum Betrieb eines Werkzeugsystems |
| DE102018117149A1 (de) * | 2018-07-16 | 2020-01-16 | Weber Unternehmensgruppe GmbH & Co .KG | Verfahren zur Flanschmontage mit automatisiertem Dokumentationsprozess mindestens eines Flanschenpaares |
-
2020
- 2020-06-30 FR FR2006853A patent/FR3111830B1/fr active Active
-
2021
- 2021-06-30 US US18/011,116 patent/US12528162B2/en active Active
- 2021-06-30 WO PCT/EP2021/068047 patent/WO2022003047A1/fr not_active Ceased
- 2021-06-30 EP EP21737467.7A patent/EP4171882A1/fr active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US12528162B2 (en) | 2026-01-20 |
| WO2022003047A1 (fr) | 2022-01-06 |
| FR3111830B1 (fr) | 2022-12-30 |
| US20230241749A1 (en) | 2023-08-03 |
| FR3111830A1 (fr) | 2021-12-31 |
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