JP6645390B2 - Manufacturing method of dissimilar material joining member - Google Patents

Description

  The present invention relates to a method for manufacturing a dissimilar material joining member formed by joining dissimilar materials.

  Conventionally, as a technique in such a field, there is JP-A-2015-042417. In the method of manufacturing a dissimilar material joining member described in this publication, the materials of the first member and the second member are different, and the first member and the second member are joined using rivets for dissimilar material joining.

  More specifically, the rivet includes a shaft portion to which a tip is spot-welded, and a plate-shaped head provided at the other end of the tip of the shaft portion. The joining surface facing the shaft portion side of the head is a flat portion provided at a predetermined interval from the outer edge of the joining surface to a position from the base end, and between the flat portion and the base end. And an annular groove provided.

  When performing dissimilar material joining using the rivet, the rivet head is in contact with the first member (upper plate), and the shaft is inserted until the tip of the shaft is protruded from the first member. A step of caulking and fixing the rivet to the first member by plastically flowing the first member in the annular groove while pressing the first member by the portion, and attaching the first member with the rivet caulked and fixed to the second member (lower plate) Performing a step of spot-welding the second member and the rivet in the superposed state.

JP-A-2005-042417

  However, in the method for manufacturing a dissimilar material joining member described above, the rivet may be tilted due to deformation of the annular groove in the spot welding process, and the molten first member may leak from the annular groove to cause a burr. . Therefore, the present invention provides a method for manufacturing a dissimilar material joining member with improved quality by preventing deformation of a rivet.

A method for manufacturing a dissimilar material joining member according to the present invention is a method for manufacturing a dissimilar material joining member for joining two or more members using a rivet, wherein the rivet has a head and a joining surface of one end portion of the head. A shaft portion to be joined to the outer surface, an annular groove provided at an interval from each of an outer edge and an inner edge of the joining surface, and a first flat portion provided between the outer edge of the joining surface and the annular groove, A second flat portion provided between the inner edge of the joining surface and the annular groove, and in a caulking step before a spot welding step, the head is brought into contact with the first member with the head in contact with the first member; In a state where the shaft portion is inserted into the first member until the tip of the portion protrudes from the first member, while pressing the first member by both the first flat portion and the second flat portion of the head, Causing the first member to plastically flow in an annular groove; The rivet fixed by caulking.
Thereby, the first member is supported by both the first flat portion and the second flat portion, and the inclination and deformation of the rivet can be suppressed.

  Thereby, the quality of the dissimilar material joining member can be improved.

It is a figure showing composition of a dissimilar material joining device. It is a figure showing a rivet. It is a figure which shows the procedure of dissimilar material joining. It is a figure which shows the reaction force which acts on the rivet which does not have a seat part. It is a figure which shows the reaction force which acts on a rivet.

Embodiment 1
Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the dissimilar material joining apparatus 1 includes an upper plate 11, a lower plate 12, a rivet 13 that joins the upper plate 11 and the lower plate 12, and a pressurizing unit 14 that pressurizes the rivet 13 and energizes the rivet 13. And.

  The upper plate 11 (first member) is one of materials for joining dissimilar materials, and for example, an aluminum plate is used. The thickness of the upper plate 11 is such that it penetrates when a rivet 13 described later is inserted.

  The lower plate 12 is the other of the materials for joining dissimilar materials, and for example, an iron plate is used. For example, the lower plate 12 has the same thickness as the upper plate 11. The lower plate 12 may have a thickness completely different from that of the upper plate 11.

  As shown in FIG. 2, the rivet 13 includes a head 21, a shaft portion 22 arranged to protrude from the surface of the head 21, and a protrusion (first portion) formed near an end of the head 21. A flat portion 23, a second flat portion 24 formed on the outer periphery of the shaft portion 22, and a portion formed between the protruding portion 23 and the second flat portion 24 on a surface to which the shaft portion 22 is joined. Annular groove 25. Typically, rivet 13 is an iron material.

  The diameter of the head 21 is larger than that of the shaft 22. For example, the head 21 has a shape such as a round head, a flat head, and a dish head. The shape of the head 21 is not limited to these shapes. Here, the surface where the shaft portion 22 is joined to the head 21 is referred to as a joint surface 21a. When the shaft portion 22 of the rivet 13 is inserted from above the upper plate 11, a part of the head 21 comes into contact with the upper surface of the upper plate 11, thereby fixing the rivet 13. Note that the outer edge of the joint surface 21 a is an outer peripheral edge of the head 21. The diameter of the head 21 is about 8 mm.

  One end of the shaft portion 22 is connected to a substantially central portion of the joining surface 21 a of the circular head 21. The shaft portion 22 has a main body 22a and a tip 22b provided at the tip of the main body 22a. Here, the main body 22a is, for example, cylindrical, and the tip 22b is, for example, conical. The shaft portion 22 is inserted from the upper side on the upper plate 11 side at the tip portion 22b side. For example, the shaft portion 22 has a body portion 22a having a height of about 1.2 mm and a diameter of about 4 mm. The height of the distal end portion 22b is about 0.2 to 0.5 mm, and is a cone having a diameter of 0 to 4 mm. Note that the inner edge of the joint surface 21a is an edge where the outer periphery of the main body 22a of the shaft portion 22 is joined to the joint surface 21a. The main body 22a is not limited to a columnar shape. For example, the main body 22a may have a tapered shape in which the diameter of a portion near the tip 22b is smaller than the diameter of a portion far from the tip 22b. Alternatively, it may be formed so that the diameter of a portion near the distal end portion 22b is larger than the diameter of a portion far from the distal end portion 22b. Further, the tip portion 22b is not limited to a conical shape, and may be, for example, a trapezoidal shape having a flat tip or an R shape.

  The protruding portion 23 is provided so as to protrude in the same direction as the shaft portion 22 on an outer extension of the joint surface 21 a of the head 21. The protruding portion 23 is provided in a ring shape with a predetermined distance from the shaft portion 22. In other words, the protrusion 23 is provided between the outer edge of the joint surface 21 a of the head 21 and the annular groove 25. At the tip of the protruding portion 23, there is a flat surface 23a provided in parallel with the joining surface 21a. For example, the protrusion 23 has a thickness in the radial direction of about 0.5 mm at the outer edge of the joint surface 21a.

  The second flat portion 24 is provided along the outer periphery of the shaft portion 22 so as to protrude from the joint surface 21 a of the head 21 in the same direction as the shaft portion 22. In other words, the second flat portion 24 is provided between the inner edge of the joining surface 21 a of the head 21 and the annular groove 25. Here, the front end of the second flat portion 24 has a flat surface 24a provided in parallel with the bonding surface 21a. The flat surface 23a provided at the tip of the protruding portion 23 and the flat surface 24a provided at the tip of the second flat portion 24 are formed so as to have substantially the same height. The diameter of the second flat portion 24 is equal to or greater than the diameter of the shaft portion +1 mm. In other words, the radial thickness of the flat surface 24a of the second flat portion 24 is formed to be 0.5 mm or more.

  The annular groove 25 is an annular groove provided on the joining surface 21a of the head 21 at a position spaced from each of the outer edge and the inner edge. More specifically, the annular groove 25 is formed with the protrusion 23 and the second flat surface. It is formed between the parts 24. That is, the annular groove 25 is a groove formed with the joint surface 21a as the bottom and the protrusion 23 and the second flat portion 24 as the wall. For example, the annular groove 25 is formed so that the inner diameter is about 5 mm, the outer diameter is about 7 mm, and the height is about 0.5 mm. The melted upper plate 11 flows into the annular groove 25. The upper plate 11 that has been plastically deformed enters the annular groove 25.

  The pressurizing section 14 has an upper chip 14a and a lower chip 14b arranged so as to sandwich the upper plate 11 and the lower plate 12. The upper chip 14 a is disposed above the upper plate 11 and contacts the head 21 of the rivet 13 from above. The lower chip 14b is arranged below the lower plate 12 and is arranged so as to face the upper chip 14a with the upper plate 11 and the lower plate 12 interposed therebetween.

  Next, a procedure for joining dissimilar materials will be described with reference to FIG.

  First, as shown in FIG. 3A, the rivet 13 is arranged on the upper part of the upper plate 11. Thereafter, the rivet 13 is inserted into the removed portion while a part of the upper plate 11 is removed, and caulking is performed. At this time, the shaft portion 22 of the rivet 13 penetrates the upper plate 11, and the distal end portion 22 b of the shaft portion 22 projects below the lower surface of the upper plate 11.

  As shown in FIG. 3B, the lower plate 12 is fitted from below the upper plate 11. At this time, the tip portion 22b of the shaft portion 22 of the rivet 13 comes into contact with the upper surface of the lower plate 12.

  Next, as shown in FIG. 3 (c), the pressurizing section 14 is in a state where the upper plate 11, the lower plate 12, and the rivet 13 are sandwiched between the upper chip 14a and the lower chip 14b. Here, the pressure applying unit 14 applies a downward force to the head 21 of the rivet 13 while energizing the upper chip 14a and the lower chip 14b. Here, the tip portion 22b of the rivet 13 is spot welded by being heated while being pressed against the lower plate 12. Thus, the upper plate 11 and the lower plate 12 are joined by the rivets 13. Note that, in FIG. 3C, a state where current is supplied between the upper chip 14a and the lower chip 14b of the pressurizing section 14 is indicated by a dotted line.

  At this time, the tip portion 22b of the shaft portion 22 is heated and softened due to spot welding, so that the tip portion 22b is crushed and may not be able to generate a sufficient reaction force. Here, as shown in FIG. 4, when a rivet without the second flat portion 24 is used, the rivet is easily deformed because the reaction force against the pressing force is at a distance.

  On the other hand, by using the rivet 13 on which the second flat portion 24 is formed as shown in FIG. 5, the protruding portion 23 and the second flat portion 24 abut on the upper surface of the upper plate 11, and the reaction force is generated at these locations. Is generated, the rivet 13 can be supported.

  Thus, by using the rivet 13 having the second flat portion 24, excessive insertion of the rivet 13 into the upper plate 11, and inclination and deformation of the rivet 13 can be suppressed. Therefore, the metal flowing into the annular groove 25 of the rivet 13 of the upper plate 11 is prevented from leaking to the upper portion of the upper plate 11 or the like due to the deformation or inclination of the rivet 13. Therefore, the quality of the dissimilar material joining member joined using the rivet 13 can be improved.

  It should be noted that the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist.

  For example, in the above description, the upper plate is described as being made of an aluminum material, the lower plate is made of an iron material, and the rivet is made of an iron material.However, it is a material that can conduct electricity, the lower plate and the rivet can be spot-welded, Materials other than these materials may be used as long as they are softer than the lower plate. Furthermore, although the description has been made as to the combination of the upper plate and the lower plate, a larger number of plates may be joined.

DESCRIPTION OF SYMBOLS 1 Dissimilar-material joining apparatus 11 Upper plate 12 Lower plate 13 Rivets 14 Pressurizing section 14a Upper chip 14b Lower chip 21 Head 21a Joining surface 22 Shaft 22a Body 22b Tip 23 Projection (first flat portion)
23a flat surface 24 second flat portion 24a flat surface 25 annular groove

Claims (1)

A method for manufacturing a dissimilar material joining member for joining two or more members using a rivet,
The rivet is
Head and
A shaft portion having one end joined to the joining surface of the head,
An annular groove provided at an interval from each of an outer edge and an inner edge of the joining surface,
A first flat portion provided between an outer edge of the joining surface and the annular groove;
A second flat portion provided between the inner edge of the joining surface to the annular groove and in contact with the outer peripheral surface of the shaft portion ;
In the caulking process before the spot welding process,
The rivet, the head is in contact with the first member, the shaft portion is inserted into the first member until the tip of the shaft portion protrudes from the first member, the first flat portion of the head and the A method for manufacturing a dissimilar material joining member, wherein the first member is plastically flown in the annular groove while the first member is pressed by both the second flat portions, and the rivet is caulked and fixed to the first member.

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