JP2006170232A - Joining structure and joining method with self-piercing rivet and device for filling adhesive agent to self-piercing rivet-joined part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joining structure capable of preventing joining strength from lowering and electrolytic corrosion from occurring by eliminating the occurrence of secondary defects caused by the interposition of an adhesive agent at the self-piercing rivet joined part. <P>SOLUTION: A sheet metal panel W1 is joined with an aluminum panel W2 with the self-piercing rivets 1. A bead part 2 is swellingly formed at a position apart a prescribed distance L from the self-piercing rivet joined part P, and the adhesive agent 4 is filled in a closed space R formed by the bead part 2 to form a main seal part 5. A seal material 8 sealing a clearance G is fillingly coated at the terminal part of one panel W2 positioned on the opposite side of the self-piercing rivet-joined part P through the main seal part 5 and close to the main seal part 5 to form an auxiliary seal part 9. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a joining structure using a self-piercing rivet, a method for joining the same, and an apparatus for filling an adhesive into the joining part using the self-piercing rivet.

  When metal plates of different materials such as aluminum plates and steel plates are overlapped and fastened with rivets, the potential difference of each metal plate when rainwater enters the joint interface between the metal plates May cause metal corrosion called so-called electrolytic corrosion.

As a countermeasure, for example, in a joining method using a self-piercing rivet, as described in Patent Document 1, a concave portion is formed on a lower metal plate of two metal plates stacked on each other, and is bonded in advance to the concave portion. After filling the adhesive, the upper metal plate is overlapped, and the self-piercing rivet is driven into the portion of the upper metal plate corresponding to the recess, so that the adhesive filled in the recess becomes the rivet and the upper and lower metals. It is said that it is efficiently filled so as to spread between the plates, and as a result, the above-described electrolytic corrosion can be prevented.
JP-A-7-269538 (FIG. 8)

  In the conventional fastening method using the self-piercing rivet as described above, since the adhesive is present at the joining interface between the upper and lower metal plates, the amount of biting of the self-piercing rivet into the lower metal plate is correspondingly increased. As a result, the bonding strength may decrease. In particular, when the plate thickness of the lower metal plate is small, the plate thickness decreases locally due to the accumulation or holding of the adhesive at the interface, and cracks occur in the plate thickness reduction portion. There is. And when coating a metal plate after self-piercing rivet bonding in a subsequent process, since the coating film does not adhere to the cracked portion, there is a concern that the quality of the appearance is deteriorated.

  In addition, there is no particular control over the spread or elongation of the adhesive accompanying the driving of the self-piercing rivet, so in some cases it may stick out of the end of the metal plate and adhere to other parts or impair the beauty. The original sealing effect will be reduced.

  The present invention has been made paying attention to such a problem, in particular, while eliminating the occurrence of secondary problems associated with the intervention of adhesive at the joint by self-piercing rivets, while also reducing the bonding strength and In addition to the bonding structure using self-piercing rivets that can prevent the occurrence of electric corrosion and the method for bonding, an apparatus for filling the bonding portion using the self-piercing rivets with an adhesive is provided. is there.

  The invention according to claim 1 is based on the premise of a structure in which self-piercing rivets are driven into and bonded to overlapping portions of metal plates made of different materials after being overlapped with each other. The bead portion bulges to a position away from a predetermined distance, and a closed space formed with the bead portion is subsequently filled with an adhesive to form a main seal portion. An auxiliary seal portion that seals the gap between the metal plates is formed on the metal plate terminal portion on the opposite side to the pierce rivet joint portion.

  Further, the invention described in claim 4 captures the technique described in claim 1 as a method of driving and joining a self-piercing rivet, and is separated from a position to be a joint by the self-piercing rivet by a predetermined distance. The bead portion and the other metal plate with the bead portion bulged in advance are overlapped with each other, and a self-piercing rivet is driven into and joined to the overlapping portion while the bead portion and the other metal plate are joined. Forming a closed space with the metal plate, a main sealing step for forming a main seal portion by subsequently filling the closed space with an adhesive, and a self-piercing rivet joint portion sandwiching the main seal portion, The auxiliary metal plate terminal portion on the opposite side includes an auxiliary sealing step of filling the gap between the metal plates with a sealing material to form an auxiliary seal portion.

  In this case, in order to fully fill the adhesive in the closed space without entraining air, as described in claim 5, in the main sealing step, the adhesive is applied from one end of the closed space formed with the bead portion. It is desirable to apply a negative pressure suction force to the other end of the closed space while filling.

  Therefore, in the inventions described in at least claims 1 and 4, the adhesive is not directly interposed in the joint part by the self-piercing rivet, and the main part which is a bead part away from the self-piercing rivet joint part by a predetermined distance. In the seal portion, the sealing property is secured by the adhesive filled in the closed space, and the sealing property is similarly secured also in the auxiliary seal portion that is separated from the seal portion by a predetermined distance.

  Furthermore, the invention described in claim 9 is an apparatus for filling an adhesive in a closed space formed with a bead portion on the premise of the joint structure using the self-piercing rivet according to claim 1, wherein In parallel with filling the closed space with the adhesive pumped by the adhesive pumping means via the filling nozzle connected to one end, the negative pressure suction nozzle connected to the other end of the closed space is used. The negative pressure suction means by the negative pressure suction means is applied to the other end.

  Therefore, in the invention described in claim 9, the adhesive can be fully filled in the closed space formed with the bead portion without involving air.

  According to the first and fourth aspects of the present invention, the adhesive is not directly interposed in the joint portion by the self-piercing rivet, and the main seal is a bead portion that is a predetermined distance away from the self-piercing rivet joint portion. Since the sealability is secured in each of the part and the auxiliary seal part, it is possible to prevent the occurrence of secondary troubles such as when an adhesive is directly interposed in the self-piercing rivet joint, Can be reliably prevented.

  Further, according to the invention described in claim 9, since the negative pressure suction force is applied to the opposite side in parallel with filling the adhesive from one end of the closed space formed with the bead portion, Adhesive filling efficiency is improved, and there is an advantage that air entrainment can be prevented.

  FIG. 1 shows a cross-sectional view of a joining structure (so-called self-piercing rivet joint structure) using, for example, self-piercing rivets between outer panel panels of an automobile as a more specific embodiment of the present invention, and FIG. FIG.

  As shown in FIG. 1, for example, a flange F of an upper panel W2 previously formed into a predetermined shape with an aluminum alloy plate is overlaid on a lower panel W1 previously formed into a predetermined shape with a steel plate, for example. Then, a plurality of self-piercing rivets 1, 1... Are driven into the overlapped portion along the longitudinal direction of the flange portion F at a predetermined pitch so that both panels W1, W2 are joined by rivet fastening. Although the self-piercing rivet 1 has a self-piercing action as the name suggests, it does not penetrate the back surface of the lower panel W2.

  Further, the flange portion F of the upper panel W2 is located along the longitudinal direction at a position separated by a predetermined distance L from the joint portion P (hereinafter simply referred to as “rivet joint portion”) by the self-piercing rivets 1, 1. The bead portion 2 is bulged in advance, and the general portion 6 opposite to the rivet joint portion P across the bead portion 2 is brought into pressure contact with the lower panel W1 as a seating surface 3, so that the bead portion 2 The closed space R formed with the lower panel W1 is fully filled with an adhesive 4 such as an epoxy resin or an acrylic resin. Thereby, the main seal portion 5 is formed.

  Further, an end flange portion 7 that is floated by a predetermined distance from the lower panel W1 is bent in advance at the terminal portion adjacent to the general portion 6, and the end flange portion 7 and the lower panel W1 are bent. The sealing material 8 is filled and applied in a bead shape in the gap G formed as described above. Thus, the auxiliary seal portion 9 is formed. As a result, in order to protect the rivet joint portion P from electrolytic corrosion or the like, the main seal portion 5 and the auxiliary seal portion 9 form a so-called double seal structure.

  Here, it is desirable that the separation distance L is at least 10 mm in order to maintain a predetermined rivet joint strength even if, for example, perforation by electric corrosion progresses to the main seal portion 5.

  Further, in the joint structure as described above, since the hermeticity of the closed space R formed with the bead portion 2 is important, the general portion 6a of the flange portion F in the upper panel W2 as shown in FIG. When the step S is set in advance with the seating surface 3 and the upper and lower panels W1, W2 are fastened and joined together by the self-piercing rivet 1, the self-elastic force of the flange portion F of the upper panel W2 is obtained. It is desirable to press the seating surface 3 against the lower panel W1. Then, after bonding by the self-piercing rivet 1, the adhesive 4 is subsequently filled in the closed space R formed by the bead portion 2.

  The bead portion 2 and the end flange portion 7 are simultaneously formed when the upper panel W2 itself is press-formed into a predetermined shape. In addition, since the automobile body having the self-piercing rivet joint as described above is coated in a later process, the bead portion 2 is formed and the adhesive 4 is filled in the closed space R before the coating process. On the other hand, the filling and application of the sealing material 8 to the gap G formed with the end flange portion 7 is performed at least before intermediate coating or top coating in the coating process.

  According to such a structure of the self-piercing rivet joint, as is clear from FIG. 1, the main seal 5 part located at a predetermined distance L from the rivet joint P and the auxiliary seal further apart from the rivet joint P by a predetermined distance. Since the rivet joint P is substantially protected by the portion 9 with a double seal structure, the rivet joint P can be surely protected from the intrusion of rainwater or the like and the electric corrosion caused by it. Further, at least secondary problems such as protrusion of the adhesive 4 from the main seal portion 5 do not occur.

  Moreover, since the adhesive 4 is not interposed between the upper and lower panels W1 and W2 in the original rivet joint P, secondary problems such as a decrease in joint strength and the occurrence of cracks as in the prior art are also completely eliminated. Does not occur.

  FIG. 4 shows an example of a system in which the adhesive 4 is filled in the closed space R formed with the bead portion 2 in the structure of the self-piercing rivet joint as described above.

  As is apparent from the figure, in addition to the surge tank 10 for storing the adhesive 4, as an adhesive pumping means for sucking the adhesive 4 from the surge tank 10 and pumping and filling it into the closed space R on the bead portion 2 side. Adhesive filling pump 11, filling side pressure chamber 12 for measuring the pressure P 1 of adhesive 4 delivered from the adhesive filling pump 11, and a filling nozzle prepared on the rear side of the filling side pressure chamber 12 13 is an adhesive filling and supplying system.

  On the other hand, separately from these, the negative pressure suction nozzle 14 and the suction side pressure chamber for measuring the pressure P2 of the adhesive 4 that is on the downstream side of the negative pressure suction nozzle 14 and sucked by the negative pressure suction nozzle 14 15 and a negative pressure suction pump 16 as a negative pressure suction means on the subsequent stage side and applying a negative pressure suction force to the suction side pressure chamber 15 forms a negative pressure suction system. The negative pressure suction pump 16 also serves as a circulation pump for circulating the adhesive 4 sucked with a negative pressure suction force to return to the surge tank 10 side, as will be described later, and the discharge of the negative pressure suction pump 16. An exhaust valve 18 that opens and closes the exhaust path 17 and a circulation valve 20 that opens and closes the circulation path 19 are provided side by side.

  The adhesive filling supply system and the negative pressure suction system are connected in a closed loop via a circulation path 19, and the circulation pump 21 for assisting the circulation of the adhesive 4 is connected to the circulation path 19. Is intervening.

  Here, as shown in FIG. 5, the packing nozzle 13 and the negative pressure suction nozzle 14 are preliminarily provided with a seal packing 22, and both are press-fitted into the open end of the closed space R formed with the bead portion 2. In order to ensure a predetermined sealing property, it is formed with a flexible material. The cross-sectional shape of the filling nozzle 13 and the negative pressure suction nozzle 14 is desirably a shape that matches the cross-sectional shape of the bead portion 2, but may be a cylindrical shape or the like as long as a predetermined sealing property can be ensured as described above. May be.

  According to such an adhesive filling system, the filling nozzle 13 is press-fitted into one end of the closed space R formed with the bead portion 2, and the negative pressure suction nozzle 14 is press-fitted into the other end of the closed space R, respectively. A closed space R is added to the filling supply system and the negative pressure suction system to form a closed loop path. Next, the exhaust valve 18 of the negative pressure suction pump 16 is opened, the negative pressure suction pump 16 is started in a state where the circulation valve 20 is closed, and negative pressure is applied to the closed space R formed with the suction side pressure chamber 15 and the bead portion 2. Apply pressure suction force. As a result, the closed space R is under a predetermined negative pressure.

  The adhesive filling pump 11 is activated with this negative pressure suction force applied, and the adhesive 4 is filled into the closed space R from the filling nozzle 13. Then, while monitoring the pressures P1 and P2 of the filling side pressure chamber 12 and the suction side pressure chamber 15 with a pressure gauge (not shown) or the like, the filling side pressure chamber 12 is surely eliminated in the closed space R. Both pumps 11 and 16 are operated until the pressures P1 and P2 of the suction side pressure chamber 15 become equal.

  If the pressures P1 and P2 of the filling side pressure chamber 12 and the suction side pressure chamber 15 become equal, the exhaust valve 18 is closed while the circulation valve 20 is opened, and the filling side pressure chamber 12 passes through the closed space R to the suction side. Both the pumps 11 and 16 are stopped immediately after the adhesive 4 is completely filled in the path leading to the pressure chamber 15. As described above, the adhesive 4 is filled in the closed space R formed with the bead portion 2. The adhesive 4 fed to the circulation path 19 side is returned to the surge tank 10 side by the circulation pump 21 and reused.

  Thus, the filling operation of the adhesive 4 into the closed space R formed with the bead portion 2 is completed. For example, the adhesive 4 is cured by heating the coated panels W1 and W2 in an oven for baking. It will be. Furthermore, after the baking, the auxiliary seal portion 9 is formed by applying the sealing material 8 to the portion that becomes the auxiliary seal portion 9 as shown in FIG. 1, and a series of sealing operations relating to the self-piercing rivet joint P is completed. become.

FIG. 3 is a cross-sectional explanatory view of an essential part showing an example of a self-piercing rivet joining structure according to the present invention. The A section enlarged view of FIG. Process explanatory drawing which shows the procedure at the time of joining panel W1, W2 of FIG. Explanatory drawing which shows an example of the system which fills the closed space formed with the bead part of FIG. 1 with an adhesive agent. FIG. 5 is an enlarged explanatory view of a filling nozzle and a negative pressure suction nozzle in FIG. 4.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Self-piercing rivet 2 ... Bead part 3 ... Seating surface 4 ... Adhesive 5 ... Main seal part 6, 6a ... General part 7 ... End flange part 8 ... Seal material 9 ... Auxiliary seal part 10 ... Surge tank 11 ... Adhesive Filling pump (adhesive pressure feeding means)
13 ... Filling nozzle 14 ... Negative pressure suction nozzle 16 ... Negative pressure suction pump (negative pressure suction means)
17 ... Exhaust path 18 ... Exhaust valve 19 ... Circulating path 20 ... Circulating valve G ... Gap P ... Self-piercing rivet joint R ... Closed space W1 ... Lower panel W2 ... Upper panel

Claims (10)

It is a structure in which self-piercing rivets are driven and joined to the overlapping part of both metal plates after overlapping metal plates of different materials,
The bead portion bulges at a predetermined distance away from the joint portion by the self-piercing rivet among the overlapping portions,
The closed space formed with this bead part is subsequently filled with adhesive to form the main seal part,
A joining structure using self-piercing rivets, wherein an auxiliary sealing portion for sealing a gap between metal plates is formed on a metal plate terminal portion opposite to the self-piercing rivet joining portion across the main seal portion.   The metal plate is pressed against the other metal plate with the clamping force of the self-piercing rivet at the end of one metal plate that is opposite the self-piercing rivet joint and sandwiching the main seal portion. 2. A joining structure using a self-piercing rivet according to claim 1, wherein a seating surface is formed.   A gap for holding the sealing material continuously on the seating surface at the end of one metal plate at a position opposite to the self-piercing rivet joint and sandwiching the main seal. The joint structure using a self-piercing rivet according to claim 2, wherein the portion is formed in advance. It is a method in which self-piercing rivets are driven and joined to the overlapping part of both metal plates after overlapping metal plates of different materials,
One metal plate with a bead portion bulging in advance from a position that should be a predetermined distance away from the position where the self-piercing rivet should become a joint is overlapped with the other metal plate, and then the self-adhesive part is placed on both. Forming a closed space with the bead portion and the other metal plate while driving and joining the pierce rivets;
A main sealing step of forming a main seal portion by subsequently filling the closed space with an adhesive;
Auxiliary sealing step of forming an auxiliary seal part by filling the gap between the metal plates with a sealing material on the metal plate terminal part opposite to the self-piercing rivet joint part across the main seal part,
A bonding method using a self-piercing rivet characterized by comprising: In the main sealing process,
5. The joining method using a self-piercing rivet according to claim 4, wherein a negative pressure suction force is applied to the other end of the closed space while filling the adhesive from one end of the closed space formed with the bead portion.   6. The self-filling according to claim 5, wherein the adhesive is filled until the pressure at one end of the closed space on the adhesive filling side is equal to the pressure at the other end of the closed space on the negative pressure suction side. Joining method with piercing rivets.   When joining the terminal part of one metal plate on the opposite side of the main seal part with the main seal part sandwiched by the self-piercing rivet with the clamping force of the self-piercing rivet The joining method by self-piercing rivets according to any one of claims 4 to 6, wherein a seating surface that press-contacts the metal plate is formed in advance.   A gap for holding the sealing material continuously on the seating surface at the end of one metal plate at a position opposite to the self-piercing rivet joint and sandwiching the main seal. The joining method by self-piercing rivet according to claim 7, wherein the portion is formed in advance. In the joining structure by the self-piercing rivet according to claim 1, an apparatus for filling an adhesive into a closed space formed with a bead portion,
In parallel with filling the closed space with the adhesive pumped by the adhesive pumping means through the filling nozzle connected to one end of the closed space,
Adhesion to a self-piercing rivet joint, wherein a negative pressure suction force is applied to the other end via a negative pressure suction nozzle connected to the other end of the closed space. Agent filling device. The discharge side of the negative pressure suction means can be switched between an exhaust path and an adhesive circulation path,
The self-piercing rivet joint according to claim 9, wherein the adhesive sucked by the negative pressure suction means is collected upstream of the adhesive pressure feeding means when switched to the circulation path side. Adhesive filling device.

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