Controller, bonding device, bonding method, and program

Abstract

To achieve joining with high reliability.SOLUTION: A joining device 10 includes a joining part 20 for sandwiching workpiece W, flowing welding current to the workpiece W, and heating and joining the workpiece W, and a controller 40 for controlling the welding current. A processor 41 of the controller 40 is operated as a recording part for storing, in a storage device 43, a target time change of the welding current based on a time change of the welding current when appropriately joining a sample of the workpiece W by the joining part 20. The processor 41 is further operated as a control part for changing the welding current according to the target time change stored in the storage device 43 when the workpiece W is joined by the joining part 20.SELECTED DRAWING: Figure 1

Description

Technical Field

[0006]

[0001] The present invention relates to a joining technique for joining a workpiece composed of a plurality of joining members.

Background Art

[0002] As an example of a technique for joining a workpiece composed of a plurality of joining members, there is a heusing welding for joining an electric wire and a crimp terminal by thermal caulking. Heusing welding includes a step of melting and extruding an insulating coating of an electric wire and a step of welding the crimp terminal and the electric wire, and temperature control in each step is important. Patent Document 1 discloses a welding apparatus that measures the temperatures of an electric wire and a crimp terminal with a radiation thermometer and performs heusing welding using the measured temperature as a feedback value.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When measuring the temperatures of an electric wire and a crimp terminal with a radiation thermometer, the measured temperature may vary greatly depending on the surface states of the electric wire and the crimp terminal, and thus an accurate temperature may not be measured. In this case, joining failure may occur due to the actual temperature being too high or too low. Such problems are not limited to heusing welding and can occur in various types of joining such as ultrasonic joining.

[0005] The present invention has been made in view of the above points, and an object thereof is to realize highly reliable joining.

Means for Solving the Problems

[0006] To solve the above problems, the joining apparatus according to the present invention comprises a joining unit that holds a workpiece consisting of a plurality of members to be joined and heats and joins the workpiece by applying a physical quantity to the workpiece that increases the temperature of the workpiece, and a controller that controls the physical quantity, wherein the controller comprises a recording unit that stores in a storage unit the target time change of the physical quantity based on the time change of the physical quantity applied to the sample by the joining unit when the sample of the workpiece is properly joined by the joining unit, and a control unit that changes the physical quantity applied to the workpiece when the joining unit joins the workpiece according to the target time change stored in the storage unit.

[0007] As an example, the target time change is the waveform of the physical quantity used to maintain the temperature of the workpiece at a first temperature for a first predetermined period.

[0008] As an example, the target time change is the waveform of the physical quantity used to maintain the temperature of the workpiece at the first temperature for a first predetermined period, and then at a second temperature different from the first temperature for a second predetermined period.

[0009] As an example, the joining device includes a radiation thermometer for measuring the temperature of the workpiece and a physical quantity meter for measuring the physical quantity applied to the workpiece. The recording unit uses the temperature measured by the radiation thermometer as a feedback value to control the physical quantity applied by the joining unit to the sample, thereby joining the sample with the joining unit. The recording unit measures the time change of the physical quantity applied to the sample when the sample is joined using the physical quantity meter. The recording unit derives the target time change based on the time change of the physical quantity measured when the sample is properly joined, and stores the derived target time change in the storage unit.

[0010] As an example, the control unit changes the physical quantity so that the time change of the physical quantity measured by the physical quantity meter matches the target time change, and monitors whether there is a temperature abnormality in the workpiece based on the temperature of the workpiece measured by the radiation thermometer.

[0011] As an example, the recording unit smooths the time variation of the physical quantity when deriving the target time variation.

[0012] As an example, the recording unit attempts to join the sample by the joining unit multiple times under different joining conditions, and derives the target time change by statistically processing multiple time changes of the physical quantity.

[0013] For example, the joining of the workpieces is by fusing welding, and the physical quantity is current or voltage.

[0014] As an example, the joining of the workpieces is ultrasonic bonding, the physical quantity is vibration, and the controller controls the amplitude of the vibration.

[0015] The joining method according to the present invention is a joining method using a joining part that clamps a workpiece consisting of a plurality of members to be joined and heats and joins the workpiece by applying a physical quantity to the workpiece that increases the temperature of the workpiece, comprising: a recording step of storing in a storage unit the target time change of the physical quantity based on the time change of the physical quantity applied to the sample by the joining part when a sample of the workpiece is appropriately joined by the joining part; and a control step of changing the physical quantity applied to the workpiece when the joining part joins the workpiece in accordance with the target time change stored in the storage unit.

[0016] The program according to the present invention causes a computer that controls a joint that holds a workpiece consisting of multiple members to be joined and heats and joins the workpiece by applying a physical quantity to the workpiece that increases the temperature of the workpiece to perform a recording process in which the computer stores in a storage unit the target time change of the physical quantity based on the time change of the physical quantity applied to the sample by the joint when the sample of the workpiece is properly joined by the joint; and a control process in which the computer changes the physical quantity applied to the workpiece when the joint joins the workpiece according to the target time change stored in the storage unit.

Advantages of the Invention

[0017] According to the present invention, a highly reliable joint is realized.

Brief Description of the Drawings

[0018] [Figure 1] It is a configuration diagram showing the configuration of the joining device according to an embodiment of the present invention. [Figure 2] It is a partial configuration diagram of the joining device of FIG. 1. [Figure 3] It is a flowchart of the process executed in the setting mode. [Figure 4] The upper graph is a graph showing an example of the temporal change in the temperature of the workpiece, and the lower graph is a graph showing an example of the target temporal change in the welding current. [Figure 5] It is a flowchart of the process executed in the setting mode. [Figure 6] It is a configuration diagram showing the configuration of the joining device according to a modification.

Modes for Carrying Out the Invention

[0019] As shown in FIG. 1, the joining device 10 according to an embodiment of the present invention includes a joining portion 20, a radiation thermometer 31, an ammeter 32, an operating device 33, a display device 34, and a controller 40. The joining device 10 is configured to perform resistance welding (also called thermal caulking) on the joining members W1 and W2 that make up the workpiece W. The joining member W1 is a crimp terminal. The joining member W2 is a plurality of electric wires each covered with an insulating film, a part of which is inserted into the cylindrical body of the crimp terminal.

[0020]

[0021] The joining portion 20 is configured to sandwich the workpiece W (the portion of the cylindrical body of the crimp terminal) and heat and join the workpiece W by applying (passing) a welding current, which is an electric current for welding, to the workpiece W.The joint portion 20 includes a pair of electrodes 21 and 22, and a pressing device 23 that sandwiches the workpiece W by moving the electrode 21 toward the electrode 22. The pressing device 23 is configured to include, for example, an air cylinder that moves the electrode 21 toward the electrode 22. The sandwiching of the workpiece W is accompanied by pressing. The joint portion 20 further includes a power supply circuit 24 that passes a welding current through the workpiece W via the electrodes 21 and 22.

[0022] Since each wire constituting the joined member W2 is covered with an insulating coating, the welding current initially flows through the joined member W1 at the start of welding, and the joined member W1 is heated. The heat generated by the heating of the joined member W1 is transmitted to the joined member W2, and the insulating coating of the wire constituting the joined member W2 is melted. The melted insulating coating is extruded by the clamping force that sandwiches the workpiece W. As a result, the joined member W1 and the joined member W2 (wire portion) are electrically connected, the welding current flows through the joined member W1 and the joined member W2, and the workpiece W is heated. The workpiece W, that is, the joined member W1 and the joined member W2 are joined by the heating of the workpiece W and the clamping force that sandwiches the workpiece W. At this time, the body portion of the joined member W1 and the wire of the joined member W2 are crushed by the clamping force. In this way, the workpiece W, that is, the joined member W1 and the joined member W2 are joined by resistance welding.

[0023] The radiation thermometer 31 is configured to include an infrared sensor or the like, and measures the temperature of the workpiece W sandwiched between the electrodes 21 and 22 in a non-contact manner. The ammeter 32 measures the welding current flowing from the joint portion 20 to the workpiece W.

[0024] The operation device 33 is configured to include a mouse, a keyboard, or a touch sensor or the like, and receives an operation from the user. The display device 34 is composed of a liquid crystal display device or the like, and displays an operation screen or the like.

[0025] The controller 40 is configured to control the operation of the joint 20, particularly the welding current from the joint 20. The controller 40 consists of a computer such as a microcomputer. The controller 40 includes a processor 41 such as a CPU (Central Processing Unit) and RAM (Random Access Memory) 42 which functions as the main memory of the processor 41. Furthermore, the controller 40 also includes a non-volatile storage device 43 that stores programs and data executed or used by the processor 41. The storage device 43 stores the target time change of the welding current used when performing fusing welding (details will be described later).

[0026] The processor 41 operates as the recording unit 41A and the control unit 41B shown in Figure 2 by executing a program stored in the storage device 43. The joining device 10 includes a setting mode in which fusing welding is attempted to set a target time change of the welding current, and a normal mode in which fusing welding is performed based on the target time change set in the setting mode. Switching between these modes is performed by the user using the operating device 33. In setting mode, the recording unit 41A operates, and in normal mode, the control unit 41B operates. In normal mode, a large number of workpieces W are joined sequentially, and heat-crimped workpieces W are mass-produced.

[0027] The recording unit 41A stores in the storage device 43 the target time change of the welding current based on the time change of the welding current supplied from the joining unit 20 to the workpiece W when the workpiece W sample is properly joined by the joining unit 20. This sets the target time change in the joining device 10. In this case, the target time change is the current waveform of the welding current. The recording unit 41A realizes the setting mode through the operation of the flowchart shown in Figure 3. The target time change may be derived by experiments using the joining device 10 by the user and stored in the storage device 43 via the operating device 33 or an I / O (Input / Output) not shown.

[0028] In the flowchart shown in Figure 3, the recording unit 41A displays a parameter input screen on the display device 34 and accepts welding parameters necessary for fusing welding that are input by the user via the operating device 33 (step S11).

[0029] The welding parameters entered in step S11 include the time change in the temperature of the workpiece W and the time change in the amount of pressure applied to the pressurizing device 23. In fusing welding, the workpiece W is heated by the welding current while being clamped (pressurized) by electrodes 21 and 22. In particular, the temperature of the workpiece W is kept at a first temperature T1 for a first predetermined period D1, as shown in the upper graph of Figure 4, and then kept at a second temperature T2, which is different from the first temperature T1, for a second predetermined period D2. The first temperature T1 and the first predetermined period D1 are set to melt and extrude the insulating coating of the member to be joined W2. The second temperature T2 and the second predetermined period D2 are set to join the exposed wires to each other and to the member to be joined W1. The first temperature T1 is set lower than the second temperature T2 so that the insulating coating of the member to be joined W2 does not carbonize while still covering the wires, which would adversely affect the subsequent joining. The first temperature T1 and the second temperature T2 may have a certain range. The predetermined periods D1 and D2 are, for example, any period of 0.1 seconds or more, more specifically, any period between 0.1 and 5.0 seconds. Here, the time change of temperature in the upper graph of Figure 4 is assumed to be input as part of the welding parameters. The amount of manipulation applied to the pressurizing device 23 should be the amount necessary to clamp the workpiece W for fusing welding, for example, the amount of manipulation applied to apply a constant clamping force for a period that includes at least the predetermined periods D1 and D2.

[0030] Subsequently, the recording unit 41A receives a start instruction for fusing welding, which is input via the operating device 33 after the pre-prepared workpiece W (workpiece W prepared as a sample) has been placed between electrodes 21 and 22 (step S12).

[0031] Upon receiving the start instruction, the recording unit 41A controls the power supply circuit 24 to energize electrodes 21 and 22 based on welding parameters, and controls the pressurizing device 23 to clamp each sample of workpiece W, thereby starting fusing welding (step S13).

[0032] In the fusing welding initiated in step S13, the recording unit 41A uses the temperature measured by the radiation thermometer 31 as a feedback value to feedback-control the welding current so that the time change of the temperature matches the time change of the workpiece W included in the welding parameters. Furthermore, in this fusing welding, the recording unit 41A sequentially measures the current value of the welding current using the ammeter 32 at predetermined time intervals (for example, every 0.1 m seconds) and records it in the storage device 43. As a result, the current waveform, which is the time change of the welding current, is measured and stored in the storage device 43.

[0033] After step S13, the recording unit 41A performs the necessary processes for executing the fusing weld until the end timing of the fusing weld (steps S14 and S15). The end timing is specified by the time change of the temperature of the workpiece W, which is a welding parameter. After the second predetermined period D2 has elapsed, the recording unit 41A may terminate the energization by the power supply circuit 24 to allow the workpiece W to cool naturally, while maintaining clamping by the pressurizing device 23 until the end timing when the temperature of the workpiece W has sufficiently decreased. When the end timing arrives (step S14; Yes), the recording unit 41A terminates clamping by the pressurizing device 23 and ends the fusing weld (step S16). Alternatively, the end timing of the second predetermined period D2 may be set as the end timing of the fusing weld, and the energization and clamping may be terminated at this timing.

[0034] After step S16, the user checks the quality of the fused weld and, if necessary, inputs an instruction via the operating device 33 to indicate whether or not to perform fused welding using another sample. The recording unit 41A determines whether or not this input instruction is an instruction to perform fused welding on another sample (step S17).

[0035] If the input instruction is an instruction to perform fusing welding (step S17; Yes), the process such as step S11 is executed again. In this way, the user attempts fusing welding any number of times while checking the quality of the fusing welding on the workpiece W sample and appropriately changing the content of the time change of the workpiece W temperature. The current waveform is stored in the memory device 43 for the number of times fusing welding is performed. The current waveform is the basis for the target time change of the welding current used in normal mode, as described later. The user can find the optimal current waveform or target time change of the welding current for fusing welding by attempting fusing welding until a suitable joint is obtained. Here, in order to avoid complicating the procedure for finding the optimal target time change, other welding parameters such as the time change of the amount manipulated to the pressurizing device 23 are not changed from what was initially input, but these may also be changed if necessary. In this case, the operation by the recording unit 41A may be restarted from the beginning.

[0036] If the input instruction is an instruction not to perform fusing welding (step S17; Yes), the recording unit 41A accepts the specification of one or more current waveforms measured when the fusing welding was well done and the workpiece W was properly joined, which is input from the user via the operating device 33 (step S18). Based on the one or more specified current waveforms, the recording unit 41A derives a target time change of the welding current and stores the derived target time change in the storage device 43 (step S19). An example of a target time change of the welding current is shown in the lower graph of Figure 4. As shown in the lower graph of Figure 4, this target time change rapidly increases the current value of the welding current in order to raise the temperature of the workpiece W to the first temperature T1 (period before the first predetermined period D1). After that, the target time change lowers the current value of the welding current to an extent that compensates for the amount of heat dissipated by the workpiece W in order to maintain the temperature of the workpiece W at the first temperature T1 (first predetermined period D1). The target time change of the welding current then causes the current value to increase sharply again to raise the temperature of the workpiece W to the second temperature T2 (the period between the first predetermined period D1 and the second predetermined period D2). Since the second temperature T2 is higher than the first temperature T1, the current value becomes higher than the current value before the first predetermined period D1. The target time change of the welding current then lowers the current value to a level that compensates for the heat dissipation of the workpiece W in order to maintain the temperature of the workpiece W at the second temperature T2 (second predetermined period D2). After that, the target time change of the welding current sets the current value to 0. From this point onward, the workpiece W is cooled naturally. The recording unit 41A also stores welding parameters other than the target time change in the storage device 43 (step S20).

[0037] If multiple current waveforms are specified in step S19, the recording unit 41A performs statistical processing on these multiple current waveforms and stores the welding current waveform resulting from the statistical results as the target time change in the storage device 43. The statistical processing may include, for example, taking the average or median waveform (average or median of the measured values ​​at each measurement timing) of the multiple current waveforms. The recording unit 41A may also smooth each of the multiple current waveforms before statistical processing using a predetermined algorithm. The recording unit 41A may also smooth the current waveform resulting from the statistical results, or the current waveform when only one current waveform is specified, using a predetermined algorithm and store the smoothed current waveform as the target time change in the storage device 43. Furthermore, the current waveform may be manually edited by the user via the operating device 33.

[0038] The control unit 41B in Figure 2 changes the welding current according to the target time change stored in the memory device 43 when the joint 20 joins the workpiece W. To achieve this process, the control unit 41B performs the process shown in Figure 5.

[0039] When the user places the workpiece W between electrodes 21 and 22 and inputs an instruction to start fusing welding to the operating device 33, the control unit 41B reads welding parameters, including the target time change of the welding current, from the storage device 43 (step S31).

[0040] Subsequently, the control unit 41B starts fusing welding based on the read welding parameters (step S32).

[0041] In the fusing welding initiated in step S32, the control unit 41B uses the welding current measured every 0.1 milliseconds by the ammeter 32 as a feedback value and feedback controls the welding current every 0.1 milliseconds so that the time change of the welding current matches the target time change of the welding current.

[0042] After step S32, the control unit 41B performs the fusing weld until the termination timing of the fusing weld (steps S33 and S34). The termination timing is specified by the target time change of the welding current. After the second predetermined period D2 has elapsed, the control unit 41B terminates the energization (supply of welding current) by the power supply circuit 24. The clamping by the pressurizing device 23 is maintained until the termination timing when the temperature of the workpiece W has sufficiently decreased. During the execution of the fusing weld, the control unit 41B monitors whether there is a temperature abnormality in the workpiece W based on the temperature of the workpiece W measured by the radiation thermometer 31 (step S35). For example, if the temperature measured by the radiation thermometer 31 is higher than the first threshold or lower than the second threshold, the control unit 41B determines that there is a temperature abnormality such as overheating or underheating (including deterioration of electrodes 21 and 22) (step S35; abnormality found) and proceeds to step S37.

[0043] When the termination timing arrives without any temperature abnormalities (step S33; Yes), the control unit 41B terminates the clamping with the pressurizing device 23 and terminates the fusing welding (step S37). Alternatively, the termination timing of the second predetermined period D2 may be set as the termination timing of the fusing welding, and the energization and clamping may be terminated at this timing. In the case of step S37 via step S35, the fusing welding is terminated midway, and the control unit 41B may display this fact on the display device 34.

[0044] As in this embodiment, the recording unit 41A stores in the storage device 43 the target time change of the welding current based on the time change of the welding current from the joining unit 20 when the workpiece W sample is properly joined by the joining unit 20. Then, the control unit 41B changes the welding current supplied to the workpiece W according to the target time change when the joining unit 20 joins the workpiece W. With this configuration, the welding current is controlled according to the target time change of the welding current based on the welding current when the workpiece W sample is properly joined, so that the workpiece W is properly heated. As a result, the probability of joint defects is reduced, and therefore, highly reliable fusing welding or joining is realized. In particular, as mentioned above, the temperature measured by the radiation thermometer changes depending on the surface condition of the workpiece W, and its measurement accuracy is poor. Therefore, as in Patent Document 1, if the welding current is controlled based on the temperature measured by the radiation thermometer in fusing welding, the probability of joint defects increases. In this embodiment, since the welding current is controlled based on the target time change of the welding current, the above-mentioned disadvantages are eliminated, and highly reliable fusing welding or joining is realized.

[0045] Furthermore, as in this embodiment, the target time change of the welding current is preferably a current waveform that maintains the temperature of the workpiece W at a first temperature for a first predetermined period, and then maintains it at a second temperature different from the first temperature for a second predetermined period. This enables fusing welding.

[0046] As in this embodiment, the recording unit 41A may use the temperature of the workpiece W measured by the radiation thermometer 31 as a feedback value to control the welding current from the joining unit 20, thereby joining the workpiece W samples with the joining unit 20. The recording unit 41A may also measure the time change of the welding current using the ammeter 32 when joining the samples. The recording unit 41A may derive a target time change of the welding current based on the time change of the welding current measured when each sample is properly joined, and store the derived target time change in the storage device 43. With this configuration, the recording of the target time change in the storage device 43 can be completed within the joining device 10.

[0047] As in this embodiment, the control unit 41B may change the welding current so that the time change of the welding current measured by the ammeter 32 matches the target time change, and monitor for any temperature abnormalities in the workpiece W based on the temperature of the workpiece W measured by the radiation thermometer 31. This allows the radiation thermometer 31, which is used in the setting mode, to be effectively used in the normal mode as well.

[0048] As in this embodiment, the recording unit 41A may smooth the time variation of the welding current when deriving the target time variation of the welding current. This reduces the adverse effects of measurement errors, abnormal values, etc., on the target time variation of the welding current.

[0049] As in this embodiment, the recording unit 41A may perform multiple trials of joining each sample by the joining unit 20 under different joining conditions (for example, the time change of the temperature of the workpiece W), and when deriving the target time change, it may statistically process multiple time changes of the welding current to derive the target time change. This reduces the adverse effects of measurement errors, abnormal values, etc., on the target time change of the welding current.

[0050] [Differentiation] The present invention is not limited to the embodiments described above. Various modifications are possible with respect to the embodiments described above. Examples of modifications are given below.

[0051] (1) For example, welding voltage may be used instead of the welding current. In this case, the ammeter 32 is changed to a voltmeter that measures the voltage between electrode 21 and electrode 22. The hardware configuration of the controller 40 is arbitrary, and at least a part of the recording unit 41A and the control unit 41B may be composed of logic circuits such as FPGA (Field-Programmable Gate Array) and ASIC (Application Specific Integrated Circuit). The storage device 43 may be located outside the controller 40. The programs that implement the recording unit 41A and the control unit 41B may be stored in a non-temporary storage medium that can be read by a computer, such as a non-volatile storage unit.

[0052] (2) The joining device may include, for example, a joining unit that holds a workpiece consisting of multiple members to be joined and heats and joins the workpiece by applying a physical quantity to the workpiece that increases the temperature of the workpiece, and a controller that controls the physical quantity. The controller may include a recording unit that stores in a storage unit the target time change of the physical quantity based on the time change of the physical quantity applied to the sample by the joining unit when the sample of the workpiece is properly joined by the joining unit. The controller may also include a control unit that changes the physical quantity applied to the workpiece by the joining unit when joining the workpiece according to the target time change stored in the storage unit. With such a configuration, the probability of joining defects is reduced, and therefore, highly reliable joining is achieved.

[0053] The physical quantity may be, in addition to the welding current or welding voltage mentioned above, ultrasonic vibrations, for example. A joining device when the physical quantity is ultrasonic vibrations is shown as joining device 110 in Figure 6. In Figure 6, elements having the same configuration as in the above embodiment are denoted by the same reference numerals.

[0054] The joining device 110 includes a joining section 120. The joining section 120 includes a pair of clamping members 121 and 122 (horn and anvil) for clamping and joining a workpiece W10 formed by overlapping plate-shaped members W11 and W12. The joining section 120 also includes a pressurizing device 123 controlled by a controller 40, which moves the clamping member 121 toward the clamping member 122 to clamp the workpiece W10 between the clamping members 121 and 122.

[0055] The joint 120 also includes an ultrasonic oscillation mechanism 124 controlled by a controller 40. The ultrasonic oscillation mechanism 124 comprises an oscillation circuit that oscillates an ultra-high frequency voltage, a transducer that converts the ultra-high frequency voltage into ultrasonic vibrations, and a cone that transmits the converted ultrasonic vibrations to the member to be joined W11 via a clamping member 121 (horn). By vibrating the member to be joined W11 with the ultrasonic waves transmitted via the clamping member 121, the contact portion of the members to be joined W11 and W12 is heated, and the workpiece W10, i.e., the members to be joined W11 and W12, are joined together.

[0056] The recording unit 41A and the control unit 41B can control the amplitude of the ultrasonic vibration by controlling the voltage applied to the transducer. The recording unit 41A and the control unit 41B can perform processing in which the welding current is replaced with the amplitude of the ultrasonic vibration. The recording unit 41A and the control unit 41B shall acquire the voltage applied to the transducer, measured by a voltmeter (not shown), as the amplitude of the ultrasonic vibration instead of the welding current measured by the ammeter 32. The radiation thermometer 31 is preferably positioned to measure the temperature of the joint portion of the member to be joined W10.

[0057] (3) The target time change in (2) above may be the waveform of the physical quantity for keeping the temperature of the workpiece at a first temperature (which may have a predetermined width) for a first predetermined period. The number of predetermined periods for keeping the temperature may be just one first predetermined period within one target time change. This allows for joining in which the temperature during joining is kept constant for a predetermined period. The target time change may also be the waveform of the physical quantity for keeping the temperature of the workpiece at a second temperature (which may have a predetermined width) different from the first temperature for a second predetermined period after keeping the temperature at the first temperature for the first predetermined period. This allows for joining in which the temperature during joining is kept constant for two predetermined periods.

[0058] (4) In relation to (2) and (3) above, the joining device may be equipped with a physical quantity meter (such as the voltmeter described above) for measuring the physical quantity applied to the workpiece, instead of the ammeter 32.

[0059] (5) In relation to (4) above, the recording unit may use the temperature measured by the radiation thermometer as a feedback value to control the physical quantity that the joining unit applies to the sample, thereby joining the sample with the joining unit. The recording unit may measure the time change of the physical quantity applied to the sample when joining the sample using the physical quantity meter. The recording unit may derive the target time change based on the time change of the physical quantity measured when the sample is properly joined, and store the derived target time change in the storage unit. With this configuration, the recording of the target time change to the storage unit can be completed within the joining device.

[0060] (6) In relation to (5) above, the control unit may change the physical quantity measured by the physical quantity meter by feedback control, etc., using the measured physical quantity as a feedback value, so that the time change of the physical quantity matches the target time change. The control unit may monitor whether there is a temperature abnormality in the workpiece based on the temperature of the workpiece measured by the radiation thermometer. This makes it possible to effectively use the radiation thermometer used in the target time change recording stage as well as in the workpiece joining stage.

[0061] (7) In relation to (4) to (6) above, the recording unit may smooth the time changes of the physical quantities when deriving the target time change. The recording unit may perform multiple trials of joining the samples by the joining unit under different joining conditions, and when deriving the target time change, it may statistically process multiple time changes of the physical quantities to derive the target time change. These measures reduce the adverse effects of measurement errors, outliers, etc., on the target time change of the physical quantities.

[0062] [Expansion of the embodiment] Although the present invention has been described above with reference to embodiments and modifications, the present invention is not limited to the above embodiments and modifications. Various modifications can be made to the above embodiments and modifications. Furthermore, each embodiment can be implemented in any combination as long as it is not contradictory. [Explanation of Symbols]

[0063] 10...Bonding device, 20...Bonding part, 21,22...Electrodes, 23...Pressurizing device, 24...Power supply circuit, 31...Infrared thermometer, 32...Ammeter, 33...Operating device, 34...Display device, 40...Controller, 41...Processor, 41A...Recording unit, 41B...Control unit, 43...Storage device, 110...Bonding device, 120...Bonding part, 121,122...Clamping members, 123...Pressurizing device, 124...Ultrasonic oscillation mechanism, W,W10...Workpiece, W1,W2,W11,W12...Bonding members.

Claims

1. A controller that controls the physical quantity that a joining portion applies to a workpiece, which is made up of a plurality of members to be joined, by clamping the workpiece and applying a physical quantity to the workpiece that increases the temperature of the workpiece, thereby heating and joining the workpiece, A recording unit that stores in a storage unit the target time change of the physical quantity based on the time change of the physical quantity applied to the sample from the joint when the workpiece sample is properly joined by the joint, The unit comprises a control unit that changes the physical quantity applied to the workpiece when the joining portion joins the workpiece according to the target time change stored in the storage unit, The aforementioned target time change is the waveform of the physical quantity used to maintain the temperature of the workpiece at a first temperature for a first predetermined period of time. controller.

2. The aforementioned target time change is the waveform of the physical quantity used to maintain the temperature of the workpiece at a first temperature for a first predetermined period, and then at a second temperature different from the first temperature for a second predetermined period. The controller according to claim 1.

3. A controller that controls the physical quantity that a joining portion applies to a workpiece, which is made up of a plurality of members to be joined, by clamping the workpiece and applying a physical quantity to the workpiece that increases the temperature of the workpiece, the controller having a physical quantity that applies to the workpiece. A recording unit that stores in a storage unit the target time change of the physical quantity based on the time change of the physical quantity applied to the sample from the joint when the workpiece sample is properly joined by the joint, The unit comprises a control unit that changes the physical quantity applied to the workpiece when the joining portion joins the workpiece according to the target time change stored in the storage unit, The aforementioned recording unit is The temperature measured by the radiation thermometer that measures the temperature of the workpiece is used as a feedback value to control the physical quantity that the joint applies to the sample, thereby joining the sample with the joint. The time change of the physical quantity applied to the sample when the sample is joined is measured by a physical quantity meter that measures the physical quantity applied to the workpiece. The target time change is derived based on the time change of the physical quantity measured when the sample is properly joined, and the derived target time change is stored in the storage unit. controller.

4. The control unit, The physical quantity is changed so that the time change of the physical quantity measured by the physical quantity meter matches the target time change. Based on the temperature of the workpiece measured by the aforementioned radiation thermometer, the presence or absence of temperature abnormalities in the workpiece is monitored. The controller according to claim 3.

5. The recording unit smooths the time change of the physical quantity when deriving the target time change. The controller according to claim 3 or 4.

6. The recording unit attempts to bond the sample by the bonding unit multiple times under different bonding conditions, and derives the target time change by statistically processing multiple time changes of the physical quantity when deriving the target time change. The controller according to any one of claims 3 to 5.

7. A controller that controls the physical quantity that a joint provides to a workpiece, which is made up of a plurality of members to be joined, by clamping the workpiece and applying a current or voltage as a physical quantity that increases the temperature of the workpiece, thereby fusing the workpiece together, A recording unit stores in a storage unit the target time change of the physical quantity based on the time change of the physical quantity applied to the sample from the joint when the workpiece sample is properly fused and welded by the joint, A control unit that changes the physical quantity applied to the workpiece when the joint fuses and welds the workpiece, according to the target time change stored in the memory unit, A controller equipped with the following features.

8. A controller that controls the amplitude of ultrasonic vibrations applied to a workpiece by a joining portion that ultrasonically joins a workpiece by clamping the workpiece and applying ultrasonic vibrations to the workpiece to raise the temperature of the workpiece, A recording unit stores in a storage unit the target time change of the amplitude of the ultrasonic vibration based on the time change of the amplitude of the ultrasonic vibration applied to the sample from the joint when the sample of the workpiece is properly ultrasonically bonded by the joint; A control unit that changes the amplitude of the ultrasonic vibration applied to the workpiece when the joining portion ultrasonically joins the workpiece according to the target time change stored in the storage unit, A controller equipped with the following features.

9. A controller according to any one of claims 1 to 8, The aforementioned joint and, A joining device equipped with the following features.

10. A joining method using a joining part that clamps a workpiece consisting of multiple members to be joined and heats and joins the workpiece by applying a physical quantity to the workpiece that increases its temperature, A recording step in which the joint portion appropriately joins the workpiece sample and the target time change of the physical quantity based on the time change of the physical quantity applied to the sample from the joint portion is stored in the storage unit, The system includes a control step of changing the physical quantity applied to the workpiece when the joining portion joins the workpiece in accordance with the target time change stored in the storage unit, The aforementioned target time change is the waveform of the physical quantity used to maintain the temperature of the workpiece at a first temperature for a first predetermined period of time. Joining method.

11. A joining method using a joining part that clamps a workpiece consisting of a plurality of members to be joined and heats and joins the workpiece by applying a physical quantity to the workpiece that increases the temperature of the workpiece, A recording step in which the joint portion appropriately joins the workpiece sample and the target time change of the physical quantity based on the time change of the physical quantity applied to the sample from the joint portion is stored in the storage unit, The system includes a control step of changing the physical quantity applied to the workpiece when the joining portion joins the workpiece in accordance with the target time change stored in the storage unit, In the aforementioned recording step, The temperature measured by the radiation thermometer that measures the temperature of the workpiece is used as a feedback value to control the physical quantity that the joint applies to the sample, thereby joining the sample with the joint. The time change of the physical quantity applied to the sample when the sample is joined is measured by a physical quantity meter that measures the physical quantity applied to the workpiece. The target time change is derived based on the time change of the physical quantity measured when the sample is properly joined, and the derived target time change is stored in the storage unit. Joining method.

12. A joining method using a joint that clamps a workpiece consisting of a plurality of members to be joined and applies a current or voltage as a physical quantity that increases the temperature of the workpiece to the workpiece to fuse weld the workpiece, A recording step in which the target time change of the physical quantity, based on the time change of the physical quantity applied to the sample from the joint when the workpiece sample is properly fused and welded by the joint, is stored in a storage unit; A control step of changing the physical quantity that the joint applies to the workpiece when it fuses welds the workpiece, according to the target time change stored in the memory unit, A joining method comprising the following features.

13. A joining method using a joining section that clamps a workpiece consisting of a plurality of members to be joined and applies ultrasonic vibrations to the workpiece to raise its temperature, thereby ultrasonically joining the workpiece, A recording step in which the joint portion appropriately ultrasonically joins a sample of the workpiece, and the target time change of the amplitude of the ultrasonic vibration, based on the time change of the amplitude of the ultrasonic vibration applied to the sample from the joint portion, is stored in a storage unit; A control step of changing the amplitude of the ultrasonic vibration applied to the workpiece when the joining portion ultrasonically joins the workpiece according to the target time change stored in the storage unit, A joining method comprising the following features.

14. A program that, when executed by a computer, causes the computer to function as the controller described in any one of claims 1 to 8.

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