JP2005155671A - Joint structure and joining method for different kinds of metallic panels - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint structure and a joining method for different kinds of metallic panels for maintaining work environment and work quality in a satisfactory condition. <P>SOLUTION: When joining different kinds of metallic panels 1, 11 mutually by tightening the different kinds of metallic panels 1, 11 in which adhesive is provided in joints 2, 12 by a self-pierce rivet 20, adhesive in an area A pressurized by the self-pierce rivet 20 when tightening by the self-pierce rivet 20 is such adhesive 3 that has lower fluidity relatively when compared with adhesive 4 arranged in the other join area B. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a joining structure and joining method for dissimilar metal panels such as aluminum plates (including alloys, hereinafter referred to as aluminum plates) and steel plates, and in particular, a joining structure for dissimilar metal panels suitable for joining with pierce rivets. And a joining method.

  Conventionally, in order to reduce rust due to electrolytic corrosion when dissimilar metal panels such as aluminum plates and steel plates with different electric potentials are joined, a joining method in which dissimilar metal panels are not brought into direct contact with an adhesive has been proposed ( Non-Patent Document 1 and Patent Document 1).

  In Non-Patent Document 1, an adhesive is applied to the joint surfaces and joined with rivets to reduce the contact surface of the dissimilar metal panel.

In Patent Document 1, a large number of non-conductive first particles having outer dimensions equal to a gap to be formed between an outer panel and an inner panel when a pressing pressure for press-molding a clinching portion is applied; A number of non-conductive second particles having a particle size larger than the particle size of these first particles are dispersed in a non-conductive adhesive composition that bonds the outer panel and the inner panel; Both panels are electrically insulated to prevent the occurrence of electrolytic corrosion.
D & M report (24-25 pages) of the magazine “Nikkei Mechanical (issued in Nikkei BP, June 2003)” JP 2001-316657 A

  However, in the conventional example of Non-Patent Document 1, the adhesive interposed between different metals protrudes from the joint portion when high pressure is applied when the pierce rivet is driven, and adheres to the die or the setter or drops off. Work environment and work quality. Further, if the amount of the intervening adhesive is reduced, the above problem can be solved, but it is necessary to apply a coating sealing material from the outside of the joint portion, which increases the cost.

  Further, even in the conventional example of Patent Document 1 described above, when jointing with a self-piercing rivet is used in combination, the spherical material may enter the rivet joint, preventing the formation of stable rivet bite, and there is a possibility that the quality of work may not be good. is there.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a joining structure and joining method for dissimilar metal panels that can favorably maintain the work environment and work quality.

  The present invention provides a dissimilar metal panel joining structure or joining method in which a dissimilar metal panel having an adhesive interposed in a joint is fastened by a self-piercing rivet, and an area that is pressed by the self-piercing rivet when fastened by the self-piercing rivet. As the adhesive, an adhesive having a relatively low fluidity was used as compared with adhesives arranged in other joining areas.

  Therefore, in the present invention, when dissimilar metal panels having an adhesive interposed in the joint portion are fastened by self-piercing rivets and the dissimilar metal panels are joined to each other, the self-piercing rivets are pressed by the self-piercing rivets. Since the adhesive in the area uses an adhesive having a relatively low fluidity compared to the adhesive disposed in the other joining areas, the adhesive in the area to be pressed when the self-piercing rivet is driven is used. Since it has low fluidity and functions as a spacer, contact between different metals can be prevented, and an adhesive can be surely present around the rivet joint, and higher electrolytic corrosion prevention performance can be obtained. .

  In addition, since the fluidity of the adhesive in the area to be pressed is low and the adhesive does not protrude from the bonded portion, it can be prevented that the protruding adhesive enters the concave portion of the die and adversely affects the bonding quality. .

  In addition, even in an area that is not directly pressurized by the self-piercing rivet, an adhesive having high fluidity can follow the change corresponding to the change in the panel gap between the rivets caused by the pressure of the self-piercing rivet. For this reason, after drying the adhesive, the strength and rigidity of the joint portion of the dissimilar metal panel can be improved.

  Hereinafter, the dissimilar metal panel joining structure and joining method of the present invention will be described based on each embodiment.

(First embodiment)
1 to 5 show a first embodiment of a joining structure and joining method of dissimilar metal panels to which the present invention is applied, FIG. 1 is a process diagram of the joining method of this embodiment, and FIG. 2 is an adhesive coating process. 3 is a perspective view of the setting process, FIG. 4 is a cross-sectional view showing the relationship between the die setter and the panel joint in the setting process, FIG. 5 is a cross-sectional view showing a state in which the pierce rivet is driven, FIG. FIG. 6 is an enlarged sectional view of FIG. 5.

  In the joining method of the present embodiment, as shown in FIG. 1, for example, an adhesive application step S1 for applying an adhesive to one of the dissimilar metal panels to be joined, and the dissimilar metal panels to be joined are interposed with an adhesive. And setting step S2 for setting on the self-piercing rivet device, a joining step K1 comprising a rivet step S3 for performing a rivet operation with the self-piercing rivet device, and a chemical conversion treatment for removing oil and fat components and the like adhering to different metal panels in the rivet joining The process is completed through a process S4, an electrodeposition coating process S5 for coating a dissimilar metal panel subjected to chemical conversion treatment, and a coating process K2 consisting of a curing process S6 for curing the coated film and adhesive. Each step included in the joining step K1 will be described below.

  In the adhesive application step S1, as shown in FIG. 2, the adhesives 3 and 4 are applied to the aluminum plate 11 or the joining portion 2 of the steel plate 1 to be joined. As the adhesives 3 and 4, for example, an epoxy adhesive having excellent rust prevention properties is used, and the application width is applied so as to be larger than the diameter of the self-piercing rivet 20 to be driven.

  Although the rivet 20 is driven at an interval that can secure the bonding strength between the panels 1 and 11, the fluidity of the adhesive 3 is low in the area A into which the rivet 20 is driven, and the other areas B (rivets 20 The fluidity of the adhesive 4 is set to a high state in the intermediate area. In the illustrated example, a tape-like adhesive 3 made of an adhesive having low fluidity is applied to the rivet 20 driving area A, and a liquid adhesive having high fluidity is applied to the other areas B. 4 is applied.

  The application thickness of the adhesive 3 is made as thin as possible to avoid the influence on the bonding quality of the self-piercing rivet 20. In addition, the adhesive 3 having low fluidity used in the area A pressed by the self-piercing rivet 20 is prevented from adhering even if touched in a tack-free state (a dry touch state).

  In the setting step S2, as shown in FIG. 3, dissimilar metal panels 1 and 11 to be joined to a self-piercing rivet device 21 (not shown) with a jig are positioned and set with adhesives 3 and 4 interposed therebetween. As shown in FIG. 4, the joint portions 2 and 12 are stacked on a die 22, and a rivet 20 to be driven is set on an upper setter 23. Even if one panel position is shifted for positioning the joint portions 2 and 12, the adhesive 3 having low fluidity used in the area A pressed by the self-piercing rivet 20 is dry to the touch. , Do not stick to or protrude from the other panel.

  In the rivet operation step S3, the piercing operation is performed by driving the self-piercing rivet 20 into the joint portions 2 and 12 by the setter 23 and the die 22 of the self-piercing rivet device 21. The self-piercing rivet 20 digs into the lower panel 1 while penetrating the upper panel 11 of the joints 2 and 12 and deforming the lower panel 1 into a die shape. FIG. 5 and FIG. The upper and lower panels 1 and 11 are riveted as shown in the enlarged view of FIG.

  Since the self-piercing rivet 20 is driven into the adhesive 3 portion having low fluidity, the adhesive 3 having low fluidity stays around the rivet forming portion 24 and hinders the ingress of water. An excellent joint can be obtained. Further, the adhesive 3 having low fluidity stays around the rivet forming portion 24, thereby preventing the adhesive 3 from protruding from the joint portions 2 and 12.

  That is, there is no protrusion of the adhesive 3, and even if the adhesive 3 is applied in such a large amount that it protrudes, it is in a tack-free state (a dry touch state). In addition, the adhesive does not adhere to the die 22 and the adhesive 3 does not enter the die 22 or adhere to the die 22 to contaminate the panel surface. Therefore, there is no adverse effect on the bonding quality by the self-piercing rivet 20, and a bonding quality of a certain level or higher is always obtained.

  Further, around the rivet joint 24, the adhesive 3 having low fluidity functions as a spacer between the panels 1 and 11, and the aluminum plate 11 and the steel plate 1 are not in direct contact. Also, in the other adhesive area B between the rivet joints 24, it is possible to prevent dissimilar metals from coming into contact with each other for the same reason.

  In the other adhesive area B between the rivet joints 24, the panel 11 may be lifted by the pressure applied during the rivet formation 24, and the gap between the panels 1 and 11 may be enlarged. Since it is applied, it can follow the enlargement of the gap, and ensures a continuous seal and prevents the aluminum plate 11 and the steel plate 1 from contacting each other. This continuous adhesive 4 is cured by the heat in the coating oven S6 after the chemical conversion treatment S4 and the electrodeposition treatment S5 in the subsequent painting step K2, and contributes to the improvement in rigidity and strength of the joining panels 1 and 11. To do. When an adhesive having low fluidity is used for this area B, it is impossible to follow the gap expansion, and a continuous adhesive length cannot be secured, and the sealing performance may be deteriorated.

  In the present embodiment, the following effects can be achieved.

  (A) When the dissimilar metal panels 1 and 11 having the adhesives 3 and 4 interposed between the joints 2 and 12 are fastened by the self-piercing rivets 20 to join the dissimilar metal panels 1 and 11, the self-piercing rivets 20 Since the adhesive in the area A pressed by the self-piercing rivet 20 at the time of fastening by the adhesive 3 uses the adhesive 3 having relatively lower fluidity than the adhesive 4 arranged in the other joining area B, the self-piercing When the rivet 20 is driven, the fluidity of the adhesive 3 in the area A to be pressed is low and functions as a spacer, so that it is possible to prevent contact between different metals, and reliably around the rivet joint 24. The adhesive 3 can be present, and higher electrolytic corrosion prevention performance can be obtained.

  (A) Further, since the fluidity of the adhesive 3 in the area A to be pressed is low and the adhesive 3 does not protrude from the joint portion, the protruded adhesive 3 enters the concave portion of the die 22 and the joint quality is increased. Can be adversely affected.

  (C) Moreover, even in the area B that is not directly pressurized by the self-piercing rivet 20, the adhesive 4 having high fluidity corresponds to the change in the panel gap between the rivets 20 caused by the pressure of the self-piercing rivet 20. It can follow changes. For this reason, after the adhesive 4 is dried, the strength and rigidity of the joint portions 2 and 12 of the dissimilar metal panels 1 and 11 can be improved.

  (D) In addition, when the adhesive 3 having relatively low fluidity is in a tack-free state (dried to the touch) when the joints 2 and 12 are overlapped, the self-piercing rivet 20 is fastened. Even if the adhesive 3 protrudes, it does not adhere even if it is touched. Therefore, even if the die 22 or the like of the self-piercing device 21 touches the adhesive 3, it can be prevented from being contaminated, and the work environment and work quality are deteriorated. Can be prevented.

  (E) Since the adhesive 3 having relatively low fluidity is disposed in a range larger than the diameter of the self-piercing rivet 20 to be used, the periphery of the rivet 20 can be filled with the adhesive 3, and water around the rivet 20 can be filled. Can be prevented, and the prevention of electric corrosion can be ensured.

(Second Embodiment)
7 and 8 show a second embodiment of a joining structure and joining method for dissimilar metal panels to which the present invention is applied, FIG. 7 is a perspective view showing a first stage of an adhesive application process, and FIG. 8 is an adhesive. It is a perspective view which shows the 2nd step of an application | coating process. The present embodiment relates to a joining structure and joining method for joining dissimilar metal panels using a pre-curing adhesive. The same devices as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted or simplified.

  In FIG. 7, in the first step S <b> 11 of the adhesive application step S <b> 1, a liquid epoxy adhesive 5 having a pre-curing property (pre-curing property) is used to apply to the bonding surface 2. Since it is liquid, it can be applied thinly in a planar shape. Moreover, fluidity | liquidity is lowered | hung over the whole surface of the apply | coated adhesive bead 5, and it is set as a tack-free state (finger touch dry state).

  Next, in the second step S12 of the adhesive application step S1, heat is applied to the adhesive 5 applied to the driving area A of the self-piercing rivet 20 to cause the pre-cure 5A, thereby reducing the fluidity of the area A portion. As a method for applying heat, any one of induction heating, heating by an industrial dryer, heat transfer by contact with a heated object, and the like can be selected and used. Here, heating is performed by an industrial dryer 6.

  The dissimilar metal panels 1 and 11 after the adhesive application step S1 are set by the setting step S2 and the self-piercing rivet device 21 in which the adhesive 5 is interposed and set in the self-piercing rivet device 21 as in the first embodiment. Riveting is performed through a joining step K1 including a rivet operation step S3 for performing a rivet operation, and after the chemical conversion treatment S4 and the electrodeposition treatment S5 in the coating step K2, it is cured by heat in the coating oven S6.

  In this embodiment, an epoxy adhesive 5 having a pre-curing property is applied as an adhesive to be used, and the adhesive 5 in the pressure area A of the self-piercing rivet 20 is reduced in fluidity by heat. Therefore, it is only necessary to use one type of adhesive 5, and since it is not necessary to paint separately, production efficiency is improved, and since no seam is formed in the adhesive 5, water is less likely to enter and is excellent. Since it exhibits electric corrosion prevention performance and is liquid, it can be applied thinly in a planar shape, is cheaper than tape-like material, and can reduce the effect on the strength of the rivet joint 24. it can.

  In particular, when the fluidity is lowered over the entire surface of the adhesive bead 5 to form a tack-free state (touch-dried state), even if the application surface of the adhesive 5 is a vertical surface, the adhesive 5 can prevent the adhesive 5 from dripping down and can improve workability.

  In the present embodiment, in addition to the effects (a) to (e) in the first embodiment, the following effects can be achieved.

  (F) The adhesive 5 is an epoxy adhesive having a pre-curing property, and the adhesive in the area A that is pressed by the self-piercing rivet 20 when being fastened by the self-piercing rivet 20 is transferred to another area B by heat. Since the flowability is lowered in comparison and the joints 2 and 12 of the dissimilar metal panels 1 and 11 are overlapped and the self-piercing rivet 20 is driven, only one type of adhesive 5 is used. This eliminates the need to paint differently, improving production efficiency. Further, since it can be applied thinly in a planar shape, it is less expensive than a tape-like adhesive and has little influence on the strength of the rivet joint 24. In addition, since no seam is formed in the adhesive 5, water does not easily enter, and good electrolytic corrosion prevention performance can be obtained.

  (G) The adhesive 5 has a relatively low fluidity over the entire surface when the dissimilar metal panels 1 and 11 are joined. Even if it is application | coating, the dripping fall of the adhesive agent 5 at the time of adhesive agent 5 application | coating can be prevented.

The process drawing of the junction structure and joining method of a dissimilar metal panel which shows one embodiment of the present invention. The perspective view of an adhesive agent coating process similarly. The perspective view of a setting process. Sectional drawing which similarly shows the relationship between the die setter and panel junction part in a setting process. Sectional drawing which shows the state by which the piercing rivet was driven. The expanded sectional view of FIG. The perspective view which shows the 1st step of the adhesive agent coating process of the joining structure and joining method of a dissimilar metal panel which shows 2nd Embodiment of this invention. The perspective view which similarly shows the 2nd step of an adhesive agent application process.

Explanation of symbols

A Pressurizing area B Other area 1, 11 Dissimilar metal panel 2, 12 Joint 3 Adhesive with low fluidity 4 Adhesive with high fluidity 5 Adhesive with briquette 20 Self-piercing rivet 21 Pierce rivet device 22 Dice 23 Setter 24 Rivet joint

Claims (10)

In the joining structure of dissimilar metal panels that fasten the dissimilar metal panels with the adhesive interposed in the joints by self-piercing rivets,
The adhesive in the area pressed by the self-piercing rivet when fastening by the self-piercing rivet uses an adhesive having a relatively low fluidity compared to the adhesive disposed in the other joining area. Bonding structure of dissimilar metal panels.   2. The dissimilar metal panel joining structure according to claim 1, wherein the adhesive having relatively low fluidity is in a tack-free state when the contacted portions are overlapped with each other.   3. The dissimilar metal panel joining structure according to claim 1, wherein the adhesive having a relatively low fluidity is disposed in a range larger than a diameter of a self-piercing rivet to be used.   The adhesive is an epoxy-based adhesive having a pre-curing property, and the adhesive in the area pressed by the self-piercing rivet at the time of fastening by the self-piercing rivet is less fluid than other areas due to heat. 4. The dissimilar metal panel joining structure according to claim 1 or 3, wherein the self-piercing rivet is driven by superimposing the dissimilar metal panel joining parts.   5. The dissimilar metal panel joining structure according to claim 4, wherein the adhesive has a relatively low fluidity over the entire surface when dissimilar metal panels are joined and is in a tack-free state. In the joining method of dissimilar metal panels, in which dissimilar metal panels with an adhesive interposed in the joint are fastened by self-piercing rivets,
As an adhesive to be arranged on any one of the joining surfaces constituting the joining part, an adhesive to be placed in an area to be pressurized at the time of fastening the self-piercing rivet is compared with an adhesive placed in another joining area. Adhesive with relatively low fluidity,
Overlap the joints of dissimilar metal panels through the adhesive,
Drive the self-piercing rivet into the area where the adhesive with relatively low fluidity is placed,
A method for joining dissimilar metal panels, comprising fastening dissimilar metal panels.   The dissimilar metal panel joining method according to claim 6, wherein the adhesive having relatively low fluidity is in a tack-free state when the contacted portions are overlapped with each other.   The method for joining dissimilar metal panels according to claim 6 or 7, wherein the adhesive having relatively low fluidity is disposed in a range larger than a diameter of a self-piercing rivet to be used.   The adhesive is an epoxy-based adhesive having a pre-curing property, and the adhesive in the area pressed by the self-piercing rivet at the time of fastening by the self-piercing rivet is less fluid than other areas due to heat. 9. The method for joining dissimilar metal panels according to claim 6 or 8, characterized in that, after the dissimilar metal panels are joined, self-piercing rivets are driven by overlapping the joining parts of dissimilar metal panels.   The method for bonding dissimilar metal panels according to claim 9, wherein the adhesive has a relatively low fluidity over the entire surface when dissimilar metal panels are bonded and is in a tack-free state.

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