JP2006000898A - Joining method and apparatus therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for joining metal by the ring-mash joining method, which method and apparatus can surely carry out the joining by securing the width of an overlapping portion taking mass productivity into consideration. <P>SOLUTION: The joining apparatus 1 carries out the so-called ring-mash joining operation, and comprises two lower electrodes 6, 6, an upper electrode 7 which is arranged above the lower electrodes 6, 6 so as to vertically move, a pressing cylinder 8 for applying a pressing force to the upper electrode 7, a wiring cable 9 for supplying an electric current from a joining transformer (not shown) to the upper electrode 7, a displacement measuring sensor 10 for measuring the displacement of the upper electrode 7, and an up-set wave form judging means 11 for judging an up-set (the depression of the upper electrode 7, the same in the following) wave form. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method and apparatus for joining metal materials, and in particular, a so-called ring mash joint in which a joining portion of one metal material and the other metal material is slightly overlapped and joined by pressing and energizing. The present invention relates to a joining method and an apparatus therefor.

  Conventionally, so-called mash seam joining is known as a joining method for metal materials. This joining method is a method in which both ends of a metal material are overlapped, and the joining is performed by pressing the roller-shaped electrode and applying current thereto. Mash means “crush”, and seam means “joint”.

  According to this joining method, the end faces of the plate materials can be welded in the same manner as butt joining, but according to general mash seam joining, a pair of roller electrodes run while being pressurized and energized along the joined parts. Therefore, there is a problem that it takes time to join.

  Therefore, Patent Document 1 below proposes a joining method and apparatus capable of joining at once for an annular joint.

  This Patent Document 1 discloses a predetermined overlap margin when mash-bonding a first bonding material having a circular or square hole and a second bonding material having an outer shape slightly larger than the hole. In the set state, the hole portion of the first bonding material and the outer shape portion of the second bonding material are overlapped, and a current is applied by applying a pressure between the two, thereby instantaneously bonding.

  This joining method is called so-called ring mash joining because of the annular shape of the joint. According to this ring mash joining, since the joining is performed instantaneously, the joining time and the amount of energization can be greatly reduced, so that the productivity can be improved.

JP 2004-17048 A

  By the way, in order to perform the ring mash joint, the width of the overlap allowance is important. That is, as described in Patent Document 1, when the width of the overlap is large, the thermal distortion becomes large and the appearance of the joint portion is deteriorated. On the other hand, when the width is small, sufficient joining is performed. (In Patent Document 1, 0.1 to 0.7 mm is desirable).

  Therefore, how to set the width of the overlap is a problem in the joining operation.

  In this regard, although not specifically described in Patent Document 1, it is conceivable to actually measure the dimensions and set the width of the overlap allowance.

  However, considering mass productivity, it is impractical and costly to measure all the dimensions of the product in order to set the width of the overlap, and to measure the fine dimensions in units of 0.1 mm. It will increase.

  In addition, it is possible to measure the dimensions of only a certain quantity of products at a certain interval to simulate the product dimensions, but in this case, it will inevitably produce products outside the proper value. Become.

  At this time, when the width of the overlap allowance is large, the appearance is deteriorated, so the operator can visually eliminate it, but when the overlap allowance width is small, it cannot be excluded visually, There is a risk of producing a defective product with insufficient bonding outside the proper value.

  Accordingly, the present invention provides a bonding method for performing metal bonding by ring mash bonding, and a bonding apparatus that can reliably perform bonding by ensuring the width of the overlap allowance in consideration of mass productivity. It is an object to provide a method and an apparatus thereof.

  According to the joining method of the present invention, the second welded metal material having an outer portion slightly larger than the opening is aligned with the first welded metal material having an annular opening with a predetermined overlap margin. And joining both the opening and the outer part, which are joining parts, by applying current in a state in which both are pressed by the upper and lower electrodes, the lower electrode, and the first welded metal material, The welding current is received in a state where the lower surface near the joining portion of one of the second welded metal materials is received, and the upper electrode pressurizes the upper surface near the joining portion of the other welded metal material. Energize and press the outer shape into the opening to join them together and detect the change state in the pressurizing direction of the upper electrode to determine that it is a predetermined reference change state. If this is the case, this is a method of judging the joining quality as appropriate.

  According to the above configuration, since the lower electrode receives the lower surface of the welding portion of one welded metal material and the upper electrode pressurizes the upper surface of the bonding portion of the other welded metal material, The relative displacement of both joints during pressure welding is accurately reflected as the amount of displacement of the upper electrode, and the upper electrode detects the change state when pressing and energizing the other welded metal material, and the detected change It is possible to determine whether or not the state is a predetermined reference change state. If the state is a predetermined reference change state, it is possible to determine that the welding quality is appropriate. That is, by detecting a change state of the upper electrode having a high correlation with the width of the overlap, the bonding quality is ensured without actually measuring the width of the overlap.

  For this reason, joining can be reliably performed without actually measuring the width of the overlap allowance, that is, the dimensions of all the products.

  The predetermined reference change state is a concept including all the movements of the upper electrode, and includes a concept including displacement, speed, acceleration, and the like.

  In an embodiment of the present invention, the predetermined reference change state is a method defined in advance by a displacement amount of the upper electrode and a joining time until the displacement amount reaches a set value.

  According to the above configuration, the predetermined reference change state is defined in advance by the displacement amount of the upper electrode and the joining time until the displacement amount reaches the set value. For this reason, a predetermined reference change state can be set in the apparatus with a “slope” value, which is the displacement amount of the upper electrode per hour, and the joining quality is determined to be appropriate within a predetermined range of this slope. However, outside the predetermined range, it can be determined that the joining quality is inappropriate.

  In one embodiment of the present invention, the set value is set to a position where the other metal member to be welded to which the upper electrode is pressed comes into contact with the stopper means.

  According to the above configuration, by setting the position where the other welded metal material contacts the stopper means as a set value, the joining position between the first welded metal material and the second welded metal material is reliably defined. Therefore, quality control of product dimensions can be performed reliably.

  In one embodiment of the present invention, the stopper means is formed on one welded metal material.

  According to the above configuration, since the stopper means is formed on one welded metal material, the relative position between the first welded metal material and the second welded metal material can be reliably defined, and the product dimensions can be managed. This can be done more reliably.

  In one embodiment of the present invention, the predetermined reference change state is defined in advance by a change state model of the upper electrode.

  According to the above configuration, the predetermined reference change state is defined in advance by the change state model of the upper electrode. For this reason, a predetermined reference change state can be set in the apparatus with a value of a “waveform model” called a change state model. Within the predetermined range of the waveform model, the joining quality is determined to be appropriate, and the predetermined range is set. Outside, it can be determined that the bonding quality is inappropriate.

  In the joining apparatus of the present invention, the second welded metal material having an outer portion slightly larger than the opening is aligned with the first welded metal material having an annular opening with a predetermined overlap margin. A joining device for joining the opening and the outer part, which are joining parts, by energizing the two under pressure with the upper and lower electrodes, the first welded metal material and the second workpiece A lower electrode that receives a lower surface in the vicinity of the welded part of one of the welded metal materials, and an upper electrode that conducts a joining current in a state where the upper surface in the vicinity of the welded part of the other welded metal material is pressurized A change state detecting means for detecting a change state of the upper electrode at the time of bonding, and determining whether the change state detected by the change state detecting means is a predetermined reference change state, and determining that it is a predetermined reference change state Judgment quality judgment to judge the joining quality as appropriate It is intended and a stage.

  According to the above configuration, the lower electrode receives the lower surface in the vicinity of the joining portion of the welded metal material of either the first welded metal material or the second welded metal material, and the upper electrode receives the other welded metal material. Since the bonding is performed by applying a bonding current in a state where the upper surface in the vicinity of the bonding portion is pressurized, the relative displacement of both the bonding portions at the time of the pressure bonding is accurately reflected as the displacement amount of the upper electrode. Therefore, at the time of joining, the change state of the upper electrode can be detected by the change state detecting means, and whether or not the change state is the predetermined reference change state can be judged by the joining quality judging means to judge the suitability of the joining quality. .

  That is, by detecting a change state of the upper electrode having a high correlation with the width of the overlap, the bonding quality is ensured without actually measuring the width of the overlap.

  For this reason, it is not necessary to actually measure the width of the overlap allowance, that is, the total number of products, and the joining can be performed reliably.

  The predetermined reference change state is also a concept including all the movements of the upper electrode, and includes a displacement, a speed, an acceleration, and the like.

  In one embodiment of the present invention, the predetermined reference change state is defined in advance by a displacement amount of the upper electrode and a joining time until the displacement amount reaches a set value.

  According to the above configuration, the predetermined reference change state is defined by the displacement amount of the upper electrode and the joining time until the displacement amount reaches the set value. For this reason, the predetermined reference change state can be set in the apparatus with the value of “inclination” which is the displacement amount of the upper electrode per time, and within the predetermined range of this inclination, the joining quality is judged to be appropriate. Outside the predetermined range, it is possible to determine that the joining quality is inappropriate.

  According to the present invention, the change state at the time of pressurizing and energizing the other welded metal material with the upper electrode is detected, and it is determined whether or not the detected pressurization change state is a predetermined reference change state. And if it is a predetermined reference change state, welding quality will be appropriate. That is, by detecting a change state of the upper electrode having a high correlation with the width of the overlap, the bonding quality is ensured without actually measuring the width of the overlap.

  For this reason, it is not necessary to actually measure the width of the overlap allowance, that is, the dimensions of all the products, and the joining operation can be performed.

  Therefore, in the joining method and apparatus for performing metal joining by ring mash joining, it is possible to reliably secure the width of the overlap allowance while taking mass productivity into consideration.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic front view of the joining apparatus of this embodiment.
The joining device 1 of this embodiment is a joining device 1 that performs so-called ring mash joining. On the installation base 2 on which the device 1 is installed, a pair of left and right frame bodies 3 that extend in the vertical direction at the front portion of the device 1; A joining base 4 provided inside the apparatus, a slide rail 5 extending in the left-right direction on the joining base 4, two lower electrodes 6 and 6 respectively moving left and right on the slide rail 5, and upper and lower parts provided above An upper electrode 7 movable in a direction, a pressurizing cylinder 8 that applies pressure to the upper electrode 7, a wiring cable 9 that transmits current from a junction transformer (not shown) to the upper electrode 7, A displacement measuring sensor 10 for measuring the displacement amount of the upper electrode 7, an upset waveform determining means 11 for determining an upset (pressing of the upper electrode 7, the same applies hereinafter) waveform, and an operation panel 12 for operating the bonding apparatus 1. , And a central control unit (not shown).

  In this bonding apparatus 1, workpieces 21 and 22 (described later) are set on either the left or right lower electrode 6, and the lower electrode 6 on which the workpieces 21 and 22 are set is moved to the center. 7 is lowered, pressurized and energized, so-called ring mash joining is performed.

  FIG. 2 and FIG. 3 are detailed cross-sectional views showing the joining state of the ring mash joint in the present embodiment, and the ring mash joint will be described using this figure.

  The lower electrode 6 and the upper electrode 7 are both constituted by cylindrical electrode bodies, and a second workpiece 22 (cylindrical sleeve which is an automatic transmission component) and a first workpiece 21 (automatic transmission component) are formed between the electrodes. Join the cylindrical clutch hub).

  In addition, the 2nd workpiece | work 22 uses the circular flange part 22a outer peripheral end as a joining part, and the 1st work 21 has an opening part corresponding to the outer peripheral end part, and the flange part 21a inner peripheral end is used as a joining part. It is said.

  Among these, the workpieces 21 and 22 are positioned by the lower electrode 6. That is, a positioning portion 61 that positions the second workpiece 22 is provided on the inner peripheral surface of the lower electrode 6, and a rough positioning portion 62 that performs rough positioning of the first workpiece 21 is provided on the outer peripheral surface. The relative positioning of the second workpiece 22 and the first workpiece 21 is performed.

  By this relative positioning, the outer peripheral end of the flange portion 22a extending in the radial direction of the second workpiece 22 and the inner peripheral end of the flange portion 21a extending in the radial direction of the first workpiece 21 are made to have a predetermined overlap width. Polymerize with W (see FIG. 2). Further, the lower surface of the flange portion 22 a of the second workpiece 22 is disposed so as to be received by the upper surface of the lower electrode 6.

  In such a state, by applying pressure in the pressing direction to the upper electrode 7, the lower surface of the upper electrode 7 is pressed against the upper surface of the flange portion 21 a of the first workpiece 21, and the outer peripheral end of the flange portion 22 a of the second workpiece 22 is A force in the press-fitting direction acts on the inner peripheral end of the flange portion 21 a of the one work 21.

  When power is applied from the upper electrode 7 to the lower electrode 6 with this force applied, the gap between the outer peripheral end of the flange portion 22a of the second workpiece 22 and the inner peripheral end of the flange portion 21a of the first workpiece 21 is melted. Softening close to is caused, and a new surface is exposed between the two and diffusion bonding is performed.

  The state joined in this way is the state shown in FIG. As shown in this figure, when ring mash joining is performed, the outer peripheral end of the flange portion 22a of the second workpiece 22 is fitted to the inner peripheral end of the flange portion 21a of the first workpiece 21, and the two are joined together. Will be done.

  When joining is performed in this way, the first work 21 falls downward, and the flange portion 21a of the first work 21 abuts against the stopper portion 6a of the lower electrode 6, so that no more current flows in the joining portion. The joining is completed. Since the stopper portion 6a is provided, no lowering occurs below this, so that the joining position of the first workpiece 21 can be defined, and the dimensional accuracy of the product can be improved.

  The ring mash joining is performed as described above. At this time, the width W of the overlap allowance greatly affects the joining quality. That is, when the overlap margin width W is large, the push-in cannot be sufficiently performed. On the other hand, when the overlap margin width W is small or not at all, the press-fit state does not occur. Therefore, it is not possible to perform proper bonding, and appropriate bonding quality cannot be obtained.

  In order to set the overlap width W reliably, it is necessary to perform fine measurement in units of 0.1 mm. However, considering mass productivity, it is not practical and costly to measure the dimensions of all the products in order to set the overlap margin width W, and to measure the fine dimensions in units of 0.1 mm. It will increase.

  Therefore, in the joining apparatus 1 of this embodiment, this problem is solved by performing joining in the joining process shown in the flowchart shown in FIG.

  First, as described above, with the second workpiece 22 and the first workpiece 21 set on the lower electrode 6, when the operator turns on the start switch in S1, the upper electrode 7 is lowered by the pressure cylinder 8 in S2. To do.

  Next, after waiting in a state where the upper electrode 7 is in contact with the first workpiece 21 in S3, the upper electrode 7 starts pressurization in S4. By providing the standby period in this way, it is possible to suppress electrode sag and deformation due to the impact of the upper electrode when contacting the first work 21.

  Next, in S5, it is determined whether the upper electrode 7 is displaced. If it is determined in this determination that the upper electrode 7 is displaced, the process proceeds to S10 and an NG signal is output to the equipment. In this way, when displacement occurs at the pressurized stage, it is assumed that there is no or no overlap allowance, so it is determined that sufficient joining cannot be performed with the workpiece, and an NG signal is output. To do.

  On the other hand, when it determines with there being no displacement by S5, it transfers to S6 and starts electricity supply. By this energization, ring mash joining is performed.

  Next, in S7, it is determined whether the displacement of the upper electrode 7 is completed within a specified time from the start of energization. Even when it is determined that the determination is not completed, the process proceeds to S10 and an NG signal is output to the facility. Thus, if the displacement is not completed within the specified time, it is assumed that the overlap margin width W is too large and the pushing is not sufficiently performed. The NG signal is output by judging that the proper joining is impossible.

  Next, in S8, it is determined whether the displacement time from the start of energization to the completion of displacement of the upper electrode 7 is within a specified value. If it is determined that the value is outside the specified value, the process proceeds to S10 and an NG signal is output to the equipment. When the displacement time is outside the specified value, for example, when displacement occurs in an extremely short time, it is presumed that the width W of the overlap is not sufficient, so that the workpieces are not sufficiently joined. It is judged that there is, and an NG signal is output.

  On the other hand, if it is determined that the displacement time is within the specified value, the process proceeds to S9 and an OK signal is output to the equipment. In this case, it is presumed that the width W of the overlap allowance has been appropriately secured, so that it is determined that the workpieces have been reliably joined, and an OK signal is output.

  By performing the joining operation in the above joining process, in this embodiment, since the joining quality can be ensured without actually measuring the dimensions of the workpieces 21 and 22, the mass productivity can be improved. .

  The displacement state of the upper electrode 7 in this joining process will be described in more detail with reference to the graph of FIG.

  The vertical axis of this graph shows the displacement amount and current value of the upper electrode 7, and the horizontal axis shows time.

  First, when the upper electrode 7 descends (corresponding to S2), the displacement line L1 of the upper electrode 7 descends with a certain inclination angle and waits for a certain period of time when it contacts the first workpiece 21 (S3). It becomes horizontal. Then, in a state where the upper electrode 7 is pressurized with a predetermined pressing force (S4), energization is started after a lapse of a predetermined time (S6), and the upper electrode 7 is lowered with a predetermined inclination angle. Pushing is performed by this lowering, and joining is performed (S9). Thereafter, the transition is made in a horizontal state at a position in contact with the stopper portion 6a.

  Appropriate joining is performed through the above process, but when the predetermined range indicated by the hatched hatching in the graph becomes a predetermined displacement within a predetermined time, it is determined that the joining is appropriate. Reference region H.

  That is, when the displacement of the upper electrode 7 occurs within the appropriate reference region H, it is determined that the bonding quality is appropriate, and when the displacement of the upper electrode 7 occurs outside the region, the bonding quality is determined to be inappropriate. (S8). This appropriate reference area is defined by setting in advance in the memory of the upset waveform determining means 11 as a value of “slope”, which is the amount of displacement per hour of the upper electrode 7.

  The displacement line L2 indicated by the dotted line is a case where it is determined as NG in S5 described above. The displacement line L3 indicated by the two-dot chain line is determined as NG in S7, and further, the displacement line L4 indicated by a broken line is , S8 is determined to be NG. Both of them have improper bonding quality, and are treated as defective products in this embodiment.

  Of course, in addition to the above displacement line, even if displacement occurs before the upper electrode 7 is pressurized, the bonding quality may be determined to be inappropriate and processed as a defective product. .

Next, the operation and effect of the present embodiment configured as described above will be described in detail.
In the joining method according to this embodiment, the first work 21 having an annular opening is aligned with the second work 22 having an outer peripheral end slightly larger than the opening with a predetermined overlap. A method of joining the opening, which is a joining portion, and the outer peripheral end by energizing both the electrodes while being pressurized by the upper and lower electrodes 6, 7, The lower surface of the flange portion 22a in the vicinity of the joint portion of the work 22 is received, and a joining current is applied to the lower surface of the upper electrode 7 in a state where the upper surface of the flange portion 21a in the vicinity of the joint portion of the first work 21 is pressurized. On the other hand, when the outer peripheral end portion is pushed in to join the two, and the displacement state in the pressurizing direction of the upper electrode 7 is detected and determined to be the appropriate reference region H. This is a method for judging the joining quality as appropriate.

  According to the above configuration, the lower electrode 6 receives the lower surface of the flange portion 22a in the vicinity of the joint portion of the second workpiece 22, and the upper electrode 7 pressurizes the upper surface of the flange portion 21a in the vicinity of the joint portion of the first workpiece 21. Because of the current-carrying joining, the relative displacement of both joining parts during pressure joining is accurately reflected as the amount of displacement of the upper electrode 7, and the upper electrode 7 detects the displacement state when the first workpiece 21 is pressurized and energized. Then, it is determined whether or not the detected displacement state is the appropriate reference region H, and if it is the appropriate reference region H, the welding quality can be determined to be appropriate. That is, by detecting the displacement state of the upper electrode 7 having a high correlation with the overlap margin width W, the bonding quality is ensured without actually measuring the overlap margin width W.

  For this reason, joining can be reliably performed without actually measuring the width W of the overlap allowance, that is, the dimensions of all the products.

  Therefore, in the joining method in which metal joining is performed by ring mash joining, the width W of the overlap allowance can be reliably ensured in consideration of mass productivity, and joining can be performed reliably.

  In this embodiment, the appropriate reference region H is a method defined in advance by the amount of displacement of the upper electrode 7 and the joining time until the amount of displacement reaches a set value.

  According to the above configuration, the appropriate reference region H is defined in advance by the displacement amount of the upper electrode 7 and the joining time until the displacement amount reaches the set value. For this reason, the appropriate reference area H can be set in advance in the memory of the upset waveform determination means 11 with the value of “slope”, which is the displacement amount of the upper electrode 7 per time, and a predetermined range of this slope. In, it can be judged that the joining quality is appropriate, and outside the predetermined range, it can be judged that the joining quality is inappropriate.

  In this embodiment, the set value is set to a position where the second work 22 to be pressed by the upper electrode 7 is in contact with the stopper portion 6a.

  According to the above configuration, the position where the first work 21 abuts against the stopper portion 6a is set as a set value, so that the joining position between the first work 21 and the second work 22 can be reliably defined and managed. Therefore, quality control of product dimensions can be performed reliably.

  Moreover, in the joining apparatus 1 according to this embodiment, the second workpiece 22 having an outer peripheral end slightly larger than the opening is positioned on the first workpiece 21 having the annular opening with a predetermined overlap margin. In the joining device 1 for joining the opening and the outer peripheral end by joining together and applying current in a state where both are pressed by the upper and lower electrodes 6, 7, The lower electrode 6 that receives the lower surface near the bonding part, the upper electrode 7 that conducts a bonding current with the upper surface near the bonding part of the first work 21 being pressurized, and the change state of the upper electrode 7 at the time of bonding are detected The displacement measurement sensor 10 to be detected and the displacement state detected by the displacement measurement sensor 10 are determined as to whether or not the appropriate reference region H. A waveform determination means 11; It is.

  According to the above configuration, the lower electrode 6 receives the lower surface in the vicinity of the joining portion of the second work 22 and the upper electrode 7 applies the joining current in a state where the upper surface in the vicinity of the joining portion of the first work 21 is pressurized. For this reason, the relative displacement between the two bonded portions during pressure bonding is accurately reflected as the displacement amount of the upper electrode 7. Therefore, at the time of joining, the displacement measurement sensor 10 detects the displacement state of the upper electrode 7, and the upset waveform determination means 11 determines whether the displacement state is the appropriate reference region H to determine the suitability of the joining quality. Can do.

  That is, by detecting the displacement state of the upper electrode 7 having a high correlation with the overlap margin width W, the bonding quality is ensured without actually measuring the overlap margin width W.

  For this reason, it is not necessary to actually measure the width W of the overlapping allowance, that is, the dimensions of all the products, and the joining can be performed reliably.

  Therefore, in the joining apparatus 1 that performs metal joining by ring mash joining, the width W of the overlap allowance can be reliably ensured while taking mass productivity into account, and the joining can be reliably performed.

  In this embodiment, the appropriate reference region H is defined in advance by the amount of displacement of the upper electrode 7 and the joining time until the amount of displacement reaches a set value.

  According to the above configuration, the appropriate reference region H is defined by the displacement amount of the upper electrode 7 and the joining time until the displacement amount reaches the set value. For this reason, the appropriate reference region H can be set in the upset waveform determination means 11 with a “slope” value, which is the amount of displacement per hour of the upper electrode 7, and the joining quality is within a predetermined range of this slope. Can be determined to be appropriate, and outside the predetermined range, it can be determined that the bonding quality is inappropriate.

  Next, another embodiment will be described. FIG. 6 shows a flowchart of the joining process of another embodiment corresponding to FIG. In addition, about the other apparatus 1 grade | etc., It is the same as that of the above-mentioned embodiment, Moreover, the same code | symbol is attached | subjected about the same process also about this flowchart, and description is abbreviate | omitted.

  In this embodiment, the determination method in the joining step is different from the above-described embodiment. That is, instead of S7 and S8, in S17, it is determined whether the displacement waveform from the start of energization to the completion of displacement is within the area of the reference waveform model, and the suitability of the joining quality is determined.

  The reference waveform model is, for example, a case where chamfering or the like is performed at the flange portion to be joined, and the upper electrode 7 is lowered with a plurality of stages of inclination angles. Are preset in the memory of the upset waveform determination means 11.

  By determining the bonding quality using such a reference waveform model, the lowering state of the upper electrode 7 can be determined in more detail than in the above-described embodiment. For this reason, higher joining quality is securable.

  Note that the slope line of the reference waveform model includes not only a straight line but also a curved line, and the shape is not particularly limited.

  Next, the operation and effect of this embodiment will be described. In the joining method of this embodiment, instead of the appropriate reference region H, the change state model of the upper electrode 7 is used as a “waveform model”, and the upset waveform determination means 11 This is a method defined in advance in the memory.

  According to the above configuration, the change state model of the upper electrode 7 is defined in advance by the “waveform model”. For this reason, the reference change state of the upper electrode 7 can be set in the apparatus with a value of a “waveform model” called a change state model, and within a predetermined range of the waveform model, the bonding quality is determined to be appropriate, Outside the predetermined range, the joining quality can be determined to be inappropriate.

  About the other effect, there exists an effect similar to the above-mentioned embodiment.

  Next, still another embodiment will be described. 7 and 8 are detailed sectional views of the present embodiment corresponding to FIGS. In addition, about another apparatus etc., it is the same as that of the above-mentioned embodiment, Moreover, the same code | symbol is attached | subjected about the same component also about sectional drawing, and description is abbreviate | omitted.

  In this embodiment, the shape of the second workpiece 122 and the shape of the lower electrode 6 are different. That is, the stopper receiving portion 122b that receives the inner peripheral end of the flange portion 21a of the first workpiece 21 is formed on the outer peripheral end of the flange portion 122a of the second workpiece 122 so as to extend in the radial direction, while the surface of the lower electrode 6 is formed. It is formed on the flat surface 6b.

  As described above, the first workpiece 21 and the second workpiece 21 are pressed by the stopper receiving portion 122b formed on the flange portion 122a of the second workpiece 122 instead of the lower electrode 6. The relative positional relationship with the workpiece 122 can also be defined reliably.

  Therefore, since the product dimension can be increased and bonded compared to the workpiece of the above-described embodiment, the product dimension can be more reliably managed.

  Next, the operation and effect of this embodiment will be described. In the joining method of this embodiment, the stopper receiving portion 122b that defines the joining position of the first workpiece 21 is formed on the second workpiece 122.

  According to the above configuration, since the stopper receiving portion 122b is formed in the second workpiece 122, the relative position between the first workpiece 121 and the second workpiece 22 can be reliably defined, and product dimensions can be managed more reliably. be able to.

  About the other effect, there exists an effect similar to the above-mentioned embodiment.

  Although the above embodiment has been described on the premise of a workpiece having a circular opening, the present invention is not limited to joining the workpieces of this circular opening, for example, a square or the like It can also be applied to a work having a rectangular opening. Furthermore, the present invention can also be applied to ring mash joining in which a part of the outer shape is joined to the opening.

  In addition, as a method of detecting the change state of the upper electrode, it is also possible to detect the acceleration at the time of bonding of the upper electrode and determine the suitability of the bonding.

As described above, in the correspondence between the configuration of the present invention and the above-described embodiment,
The first welded metal material of the present invention corresponds to the first work 21 of the embodiment,
Similarly,
The second welded metal material corresponds to the second workpieces 22 and 122, and the predetermined reference change state corresponds to the appropriate reference region H etc.
The present invention is not limited to the configuration of the above-described embodiments, but includes embodiments of various joining methods and joining devices.

The whole front view which showed the joining apparatus of this embodiment. Detailed sectional drawing which showed the joining state of ring mash joining. Detailed sectional drawing which showed the joining state of ring mash joining. The flowchart which shows the joining method of this embodiment. The graph which shows the displacement state of an upper electrode. The flowchart which shows the joining method of other embodiment. The detailed sectional view showing the joined state of other embodiments. The detailed sectional view showing the joined state of other embodiments.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Joining device 6 ... Lower electrode 7 ... Upper electrode 10 ... Displacement measurement sensor (change state detection means)
11: Upset waveform determining means (bonding quality determining means)
21 ... 1st work (1st metal material to be welded)
22, 122 ... second workpiece (second welded metal material)

Claims (7)

A first welded metal material having an annular opening is aligned with a second welded metal material having an outer portion slightly larger than the opening with a predetermined overlap, and both are connected to upper and lower electrodes. A bonding method for bonding the opening and the outer portion, which are bonding sites, by energizing in a state pressurized with
At the lower electrode, receive the lower surface in the vicinity of the joint portion of the welded metal material of either the first welded metal material or the second welded metal material,
In the state where the upper electrode pressurizes the upper surface in the vicinity of the joining site of the other welded metal material,
While performing the joining of both by pushing the outer shape portion against the opening,
A joining method in which when a change state in the pressurizing direction of the upper electrode is detected and it is determined that the state is a predetermined reference change state, the joining quality is determined to be appropriate. The joining method according to claim 1, wherein the predetermined reference change state is defined in advance by a displacement amount of the upper electrode and a joining time until the displacement amount reaches a set value. The joining method according to claim 2, wherein the set value is a position where the other metal member to be welded pressed by the upper electrode comes into contact with the stopper means. The joining method according to claim 3, wherein the stopper means is formed on one welded metal material. The joining method according to claim 1, wherein the predetermined reference change state is defined in advance by a change state model of the upper electrode. A first welded metal material having an annular opening is aligned with a second welded metal material having an outer portion slightly larger than the opening with a predetermined overlap, and both are connected to upper and lower electrodes. A joining device that joins the opening and the outer part, which are joining parts, by energizing in a state pressurized with
A lower electrode that receives a lower surface in the vicinity of a joint portion of the welded metal material of any one of the first welded metal material and the second welded metal material;
An upper electrode for energizing the joining current in a state where the upper surface near the joining portion of the other welded metal material is pressurized;
Change state detecting means for detecting a change state of the upper electrode at the time of bonding;
It is determined whether or not the change state detected by the change state detection means is a predetermined reference change state, and when it is determined that the change state is a predetermined reference change state, a joining quality determination means that judges that the joining quality is appropriate is provided. Joining device. The joining apparatus according to claim 1, wherein the predetermined reference change state is defined in advance by a displacement amount of the upper electrode and a joining time until the displacement amount reaches a set value.

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