JP6580290B1 - Electrical contact and method for manufacturing the same - Google Patents

Abstract

An electrical contact that can suppress deterioration of the joint between the contact and the base metal is obtained. The electrical contact is bonded to the base metal via a base metal formed in a plate shape and having a through hole formed in the thickness direction, a bonding material provided on the first surface of the base metal, and the bonding material. The contact point is formed integrally with the first flange portion and the first flange portion, which are opposed to the first surface and provided inside the bonding material, and are integrally formed with the leg portion and the leg portion inserted into the through hole. And a rivet having a second brim portion facing the second surface of the base metal, and the bonding material is pressed against the first surface by the rivet.

Description

  The present invention relates to an electric contact in which a contact is bonded to a base metal and a method for manufacturing the electric contact.

  2. Description of the Related Art Conventionally, an electrical contact including a base metal, a bonding material provided on the base metal, and a contact bonded to the base metal via the bonding material is known (see, for example, Patent Document 1). Conventionally, a base metal having a through-hole formed in the plate thickness direction, a bonding material provided in the base metal, a leg portion inserted into the through-hole, and a flange portion bonded to the base metal through the bonding material There is known an electric contactor including a rivet having a contact point and a contact point provided on a collar part of the rivet (see, for example, Patent Document 2).

JP 2014-232617 A JP, 2006-207380, A

  However, in the electric contact described in Patent Document 1, the peripheral portion of the bonding material may be peeled off from the base metal by using the electric contact. In this case, there has been a problem that the bonding between the contact and the base metal deteriorates. In the electric contact described in Patent Document 2, the use of the electric contact may cause the peripheral edge of the contact to peel off from the rivet collar. In this case, there has been a problem that the bonding between the contact point via the rivet and the base metal is deteriorated.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an electrical contactor capable of suppressing deterioration of joining between a contact point and a base metal, and a manufacturing method thereof. To do.

An electrical contact according to the present invention includes a base metal formed in a plate shape and having a through-hole formed in a plate thickness direction, a bonding material provided on a first surface of the base metal, and a base metal via the bonding material. And the first flange that is opposed to the first surface and provided in the bonding material, and is integrally formed with the first flange and the leg and the leg inserted into the through hole. And a rivet having a second flange portion facing the second surface of the base metal, and the first flange portion does not exist in the portion of the bonding material between the peripheral edge portion of the contact and the base metal. The bonding material is pressed against the first surface by rivets.
The electrical contactor manufacturing method according to the present invention is formed on a base metal after a first bonding material application step of applying a first bonding material to a first surface of a plate-shaped base metal, and a first bonding material application step. A rivet leg inserting step of inserting a rivet leg into the formed through-hole and overlapping the first rivet of the rivet on the first bonding material; and a rivet leg inserting step after the rivet leg inserting step The second bonding material is applied to the material, and the second bonding material application step in which the first flange is disposed between the first bonding material and the second bonding material, and the second bonding material application step, the second The contact is stacked on the bonding material, and the contact, the first bonding material, and the second bonding material are compressed in the stacking direction and heated, and the contact, the rivet, and the bonding material including the first bonding material and the second bonding material are heated. After the contact joining step for joining the base metal to each other, and after the contact joining step, the leg portion is deformed to be opposed to the second surface of the base metal. And a leg portion deformed to form a flange portion on the rivet, the legs deformation step, the bonding material, by rivets, pressed against the first surface.

  According to the electrical contact and the method for manufacturing the same according to the present invention, it is possible to suppress the deterioration of the joint between the contact and the base metal.

It is sectional drawing which shows the electrical contact which concerns on Embodiment 1 of this invention. It is an enlarged view which shows the A section of FIG. It is a flowchart which shows the manufacturing method of the electrical contact of FIG. It is a figure which shows the 1st joining material application | coating process of FIG. It is a figure which shows the rivet leg part insertion process of FIG. It is a figure which shows the 2nd bonding material application | coating process of FIG. It is a figure which shows the contact bonding process of FIG. It is a figure which shows the leg part deformation | transformation process of FIG. It is sectional drawing which shows the electrical contact which concerns on Embodiment 3 of this invention. It is sectional drawing which shows the electrical contact which concerns on Embodiment 4 of this invention. It is sectional drawing which shows the electrical contact which concerns on Embodiment 5 of this invention. It is sectional drawing which shows the modification of the electrical contact of FIG. It is sectional drawing which shows the modification of the electrical contact of FIG.

Embodiment 1 FIG.
1 is a cross-sectional view showing an electrical contact according to Embodiment 1 of the present invention. FIG. 2 is an enlarged view showing a portion A of FIG. An electrical contact according to Embodiment 1 of the present invention includes a base metal 1, a bonding material 2 provided on the base metal 1, a rivet 3 bonded to the base metal 1 through the bonding material 2, and a bonding material. And a contact 4 joined to the base 1 through 2.

  The base metal 1 is made of a copper alloy containing Cu (copper) as a main component. The base metal 1 is formed in a plate shape. A through hole 11 is formed in the base 1 so as to penetrate in the thickness direction of the base 1. One surface of the base metal 1 is a first surface 12 and the other surface is a second surface 13.

  The bonding material 2 is overlaid on the first surface 12 of the base metal 1. As the bonding material 2, a sintered type silver bonding material paste containing Ag nanoparticles that are Ag (silver) fine particles is used. Ag fine particles are contained in metal fine particles. The center particle diameter of Ag nanoparticles is 50 nm.

  The rivet 3 is opposed to the first surface 12 and is provided with a first flange 31 provided inside the bonding material 2, and a leg 32 formed integrally with the first flange 31 and inserted into the through hole 11. The second flange portion 33 is formed integrally with the leg portion 32 and faces the second surface 13. When viewed in the thickness direction of the base metal 1, the area of the first flange 31 is larger than the area of the through hole 11. Accordingly, the first flange 31 is not inserted into the through hole 11. Further, when viewed in the plate thickness direction of the base metal 1, the area of the second flange portion 33 is larger than the area of the through hole 11. Therefore, the second flange 33 is not inserted into the through hole 11.

  The second flange 33 pushes the base metal 1 toward the bonding material 2. Thereby, a compressive force P acts on the bonding material 2. In other words, the bonding material 2 is pressed against the first surface 12 by the rivets 3.

  The contact 4 includes a main component and an additive. The main component of the contact 4 is Ag. The additive of the contact 4 is an oxide of In (indium) and an oxide of Sn (tin). The contact 4 contains about 1 to 30 wt% of In oxide and Sn oxide.

  Next, a method for manufacturing an electrical contact will be described. FIG. 3 is a flowchart showing a method of manufacturing the electrical contact shown in FIG. First, in step S1, a first bonding material application process is performed. FIG. 4 is a diagram illustrating a first bonding material application process of FIG. 3. In the first bonding material application step, the first bonding material 21 is applied to the first surface 12 of the base metal 1 and around the through hole 11.

  The first bonding material 21 is a part of the bonding material 2. The amount of the first bonding material 21 is one third of the amount of the bonding material 2. The dimension in the thickness direction of the first bonding material 21 is about 50 μm.

  In the first bonding material application step, a screen printer and a screen printing mask are used. By using the screen printing machine and the screen printing mask, the first bonding material 21 is applied only to the set region in the base metal 1.

  As shown in FIG. 3, after step S1, a first heat drying step is performed in step S2. In the first heat drying step, the organic solvent contained in the first bonding material 21 is removed. In addition, when the dimension of the thickness direction of the 1st joining material 21 is small, a 1st heat drying process is omissible.

  After step S2, a rivet leg insertion step is performed in step S3. FIG. 5 is a diagram showing a rivet leg insertion step of FIG. In the rivet leg portion insertion step, the leg portion 32 of the rivet 3 is inserted into the through hole 11 of the base metal 1 from the first surface 12 side, and the first flange portion 31 of the rivet 3 is overlapped on the first bonding material 21. In the rivet leg insertion step, a part of the leg 32 of the rivet 3 is protruded in a direction away from the first surface 12 with respect to the second surface 13. In the first heat drying step, the organic solvent contained in the first bonding material 21 is removed, so in the rivet leg insertion step, the first bonding material 21 is the first brim portion 31 and the base metal 1 of the rivet 3. It is suppressed that it is crushed between.

  As shown in FIG. 3, after step S3, in step S4, a second bonding material application step is performed. FIG. 6 is a diagram illustrating a second bonding material application process of FIG. 3. In the second bonding material application step, the second bonding material 22 is applied to the first flange 31 and the first bonding material 21, and the first flange 31 is interposed between the first bonding material 21 and the second bonding material 22. To place.

  The second bonding material 22 is a part of the bonding material 2. The amount of the second bonding material 22 is 2/3 of the amount of the bonding material 2. In other words, the second bonding material 22 is a portion obtained by removing the first bonding material 21 from the bonding material 2. In the second bonding material application step, a screen printer and a screen printing mask are used as in the first bonding material application step. As a result, the second bonding material 22 is applied only to the setting regions of the first flange 31 and the first bonding material 21. By changing the plate thickness of the screen printing plate, the coating amount of the second bonding material 22 is changed.

  As shown in FIG. 3, after step S4, in step S5, a second heat drying step is performed. In the second heat drying step, the organic solvent contained in the bonding material 2 is removed. In the second heat drying step, the bonding material 2 is heated to 80 ° C. for 30 minutes.

  After step S5, a contact bonding process is performed in step S6. FIG. 7 is a diagram showing the contact joining step of FIG. In the contact bonding step, the contact 4 is overlapped on the second bonding material 22, and the contact 4, the first bonding material 21 and the second bonding material 22 are compressed in the stacking direction and heated to heat the first bonding material 21 and the second bonding material. The bonding material 2 made of the material 22 and the contact 4 are bonded.

  The operation of superimposing the contacts 4 on the second bonding material 22 is automatically performed by a mounting device having an alignment camera and a mounting collet. The mounting device identifies each of the position of the contact 4 and the position of the second bonding material 22 using an image captured by the alignment camera, and determines the position where the contact 4 is overlapped with the second bonding material 22. To do.

  Further, in the operation of stacking the contact 4 on the second bonding material 22, the mounting device heats the mounting collet holding the contact 4 to about 150 ° C., and the contact 4 is connected to the second bonding material 22 with a pressure of about 500 Pa. Press on. Thereby, the adhesive solvent contained in the second bonding material 22 is volatilized, and the contact 4 and the second bonding material 22 are adhered to each other.

  The work of compressing and heating the contact 4, the first bonding material 21 and the second bonding material 22 in the stacking direction is performed by a pair of bonding collets 5. In the operation of compressing and heating the contact 4, the first bonding material 21, and the second bonding material 22 in the laminating direction, one bonding collet 5 is applied to the contact 4, and the other bonding collet 5 is applied to the leg portion 32. . In the operation of compressing and heating the contact 4, the first bonding material 21 and the second bonding material 22 in the laminating direction, the bonding collet 5 is heated to 250 ° C. and at the same time using the bonding collet 5 at a pressure of 10 MPa. The contacts 4 and the legs 32 are compressed in the laminating direction for 10 minutes. Accordingly, the first bonding material 21 and the second bonding material 22 are integrated, and the contact 4 and the bonding material 2 are bonded to each other.

  As shown in FIG. 3, after step S6, a leg deforming step is performed in step S7. FIG. 8 is a view showing the leg deformation step of FIG. In the leg deforming step, the leg 32 is deformed to form the second flange 33 facing the second surface 13 on the rivet 3. Thereby, the rivet 3 is fixed to the base 1 by caulking. In this example, the leg portion 32 is compressed in the stacking direction, and the second flange portion 33 facing the second surface 13 is formed on the rivet 3. In the leg deforming step, the contact 4 and the leg 32 are compressed in the laminating direction for 10 minutes at a pressure of 30 MPa using the pair of collets 5 for joining. Thus, an electrical contact is manufactured.

  A second flange 33 is formed on the rivet 3 by the leg deforming step. Thereby, as shown in FIG. 2, the compressive force P which acts on the part of the joining material 2 piled up with respect to the peripheral part of the contact 4 remains. In other words, the portion of the bonding material 2 superimposed on the peripheral edge of the contact 4 is pressed against the first surface 12. Therefore, the bonding strength between the contact 4 and the bonding material 2 is improved, and peeling of the contact 4 from the base metal 1 is suppressed. As a result, the reliability life of the electrical contact is extended.

  Next, the further effect by the 1st collar part 31 of the rivet 3 being arrange | positioned inside the joining material 2 is demonstrated. When the first flange 31 is not disposed inside the bonding material 2, the contact 4 is bonded to the base 1 via the bonding material 2. Accordingly, diffusion bonding is formed at the interface between the contact 4 and the bonding material 2. The bonding force between the contact 4 and the bonding material 2 is determined by the mechanical stress applied from the outside and the heating temperature when the contact 4 and the bonding material 2 are bonded. Therefore, as the electric contact is used, the bonding force between the contact 4 and the bonding material 2 gradually decreases. Of the bonding forces between the contact 4 and the bonding material 2, the bonding force between the peripheral edge of the contact 4 and the portion of the bonding material 2 superimposed on the peripheral edge of the contact 4 is the weakest. A peeling phenomenon is likely to occur between the peripheral portion and the portion of the bonding material 2 superimposed on the peripheral portion of the contact 4.

  On the other hand, when the first flange 31 is disposed inside the bonding material 2, a force is applied to the rivet 3 to release the stress generated in the rivet 3 due to the compressive deformation of the rivet 3. Therefore, a force that presses the bonding material 2 toward the contact 4 acts on the first flange 31. The force with which the bonding material 2 is pressed toward the contact point 4 by the peripheral edge portion of the first flange portion 31 is larger than the force with which the bonding material 2 is pressed toward the contact point 4 by the center portion of the first flange portion 31. Therefore, the peripheral edge portion of the bonding material 2 is pressed toward the contact 4 with a stronger force than the center portion of the bonding material 2.

  Even after the contact bonding step, mechanical stress and heating from the outside are applied to the bonding material 2 and the contact 4, so that diffusion bonding at the interface between the bonding material 2 and the contact 4 proceeds, and bonding The bonding strength between the material 2 and the contact 4 is increased. Therefore, the diffusion bonding between the bonding material 2 and the contact 4 proceeds by the force acting on the contact 4 from the rivet 3. As a result, the bonding strength between the bonding material 2 and the contact 4 increases as the electric contact is used. From the above, compared with the case where the first brim portion 31 of the rivet 3 is not disposed inside the bonding material 2, the portion of the bonding material 2 overlapped with the peripheral edge portion of the contact 4 and the peripheral edge portion of the contact 4. The bonding strength between the two increases.

  As described above, the electrical contact according to the first embodiment of the present invention includes the contact 4 joined to the base 1 via the joining material 2 and the rivet 3. The rivet 3 faces the first surface 12 and is formed integrally with the first flange 31 and the first flange 31 provided inside the bonding material 2, and the leg 32 and the leg inserted into the through hole 11. The second flange 33 is formed integrally with the portion 32 and faces the second surface 13 of the base 1. The bonding material 2 is pressed against the first surface 12 by the rivet 3. Thereby, it is suppressed that the peripheral part of the joining material 2 peels from the base metal 1. FIG. As a result, it is possible to suppress the deterioration of the joint between the contact 4 and the base metal 1.

  Further, the portion of the bonding material 2 overlapped with the peripheral edge of the contact 4 is pressed against the first surface 12 by the rivet 3. By using the electrical contact, a force acts on the peripheral edge of the contact 4 in a direction away from the bonding material 2. The portion of the bonding material 2 overlaid on the peripheral edge of the contact 4 is pressed against the first surface 12 by the rivet 3 so that the portion of the bonding material 2 overlaid on the peripheral edge of the contact 4 becomes a base. The separation from the gold 1 is suppressed. As a result, it is possible to suppress the deterioration of the joint between the contact 4 and the base metal 1.

  Further, the peripheral edge of the first flange 31 presses the bonding material 2 toward the contact 4. Therefore, the bonding strength between the peripheral edge of the contact 4 and the portion of the bonding material 2 superimposed on the peripheral edge of the contact 4 can be increased.

  According to the method of manufacturing the electrical contact according to the first embodiment of the present invention, the leg 32 is deformed to form the second flange 33 facing the second surface 13 of the base 1 on the rivet 3. In the leg deformation process, the bonding material 2 is pressed against the first surface 12 by the rivets 3. Thereby, it is suppressed that the peripheral part of the joining material 2 peels from the base metal 1. FIG. As a result, it is possible to suppress the deterioration of the joint between the contact 4 and the base metal 1.

Embodiment 2. FIG.
In the first embodiment, the bonding material 2 includes Ag fine particles. In the first embodiment, the main component of the contact 4 is Ag, and the additive of the contact 4 is In oxide and Sn oxide. On the other hand, in Embodiment 2, the bonding material 2 includes Cu nanoparticles that are Cu fine particles. Cu fine particles are contained in metal fine particles. The main component of the contact 4 is Cu, and the additive of the contact 4 is W (tungsten). The contact 4 contains about 1 to 40 wt% of W. Other configurations are the same as those in the first embodiment.

  In the first embodiment, in the contact bonding process, the bonding collet 5 is heated to 250 ° C., and at the same time, the bonding collet 5 is used to compress the contacts 4 and the legs 32 in the laminating direction for 10 minutes at a pressure of 10 MPa. . On the other hand, in the second embodiment, in the contact bonding process, the bonding collet 5 is heated to 280 ° C. and at the same time, the bonding collet 5 is used to compress the contacts 4 and the legs 32 in the laminating direction for 10 minutes. To do. Other electrical contact manufacturing methods are the same as those in the first embodiment.

  As described above, the electrical contact according to the second embodiment of the present invention includes the contact 4 joined to the base 1 via the joining material 2 and the rivet 3. The rivet 3 faces the first surface 12 and is formed integrally with the first flange 31 and the first flange 31 provided inside the bonding material 2, and the leg 32 and the leg inserted into the through hole 11. The second flange 33 is formed integrally with the portion 32 and faces the second surface 13 of the base 1. The bonding material 2 is pressed against the first surface 12 by the rivet 3. Thereby, it is suppressed that the peripheral part of the joining material 2 peels from the base metal 1. FIG. As a result, it is possible to suppress the deterioration of the joint between the contact 4 and the base metal 1.

Embodiment 3 FIG.
FIG. 9 is a cross-sectional view showing an electrical contact according to Embodiment 3 of the present invention. An uneven portion 34 is formed on the surface of the first collar portion 31 of the rivet 3 facing the contact 4. Thereby, the contact area with respect to the joining material 2 in the 1st collar part 31 of the rivet 3 increases. Therefore, the bonding strength between the first flange 31 of the rivet 3 and the bonding material 2 is improved. Other configurations are the same as those in the first embodiment. Other configurations may be the same as those in the second embodiment.

  As described above, according to the electric contact according to the second embodiment of the present invention, the uneven portion 34 is formed on the surface of the first flange portion 31 that faces the contact 4. Thereby, the joining strength between the 1st collar part 31 of the rivet 3 and the joining material 2 can be improved.

Embodiment 4 FIG.
FIG. 10 is a cross-sectional view showing an electrical contact according to Embodiment 4 of the present invention. An uneven portion 35 is formed on the surface of the first collar portion 31 of the rivet 3 that faces the base metal 1. Thereby, the contact area with respect to the joining material 2 in the 1st collar part 31 of the rivet 3 increases. Therefore, the bonding strength between the first flange 31 of the rivet 3 and the bonding material 2 is improved.

  An uneven portion 41 is formed on the surface of the contact 4 facing the base 1. Thereby, the contact area with respect to the joining material 2 in the contact 4 increases. Therefore, the bonding strength between the contact 4 and the bonding material 2 is improved. Other configurations are the same as those of the third embodiment.

  As described above, according to the electric contact according to the fourth embodiment of the present invention, the uneven portion 35 is formed on the surface of the first collar portion 31 of the rivet 3 that faces the base metal 1. Thereby, the joining strength between the 1st collar part 31 of the rivet 3 and the joining material 2 can be improved.

  Further, an uneven portion 41 is formed on the surface of the contact 4 facing the base 1. Thereby, the joining strength between the contact 4 and the joining material 2 can be improved.

Embodiment 5 FIG.
FIG. 11 is a sectional view showing an electrical contact according to Embodiment 5 of the present invention. A recess 42 is formed on the surface of the peripheral edge of the contact 4 facing the base metal 1. Thereby, the contact area with respect to the joining material 2 in the peripheral part of the contact 4 increases. Accordingly, the bonding strength between the peripheral edge portion of the contact 4 and the bonding material 2 is improved. Other configurations are the same as those in the fourth embodiment.

  As described above, according to the electric contact according to the fifth embodiment of the present invention, the recess 42 is formed on the surface of the peripheral edge of the contact 4 that faces the base metal 1. Thereby, the joining strength between the peripheral part of the contact 4 and the joining material 2 can be improved.

  In the fifth embodiment, the uneven portion 34 is formed on the surface of the first flange 31 that faces the contact 4, and the uneven portion 35 is formed on the surface of the first flange 31 that faces the base metal 1. Yes. However, the present invention is not limited to this, and as illustrated in FIG. 12, a configuration in which the concave portion 36 is formed on the surface of the peripheral portion of the first flange portion 31 that faces the contact 4 may be employed. Thereby, the joining strength between the peripheral part of the 1st collar part 31 and the joining material 2 can be improved. Moreover, as shown in FIG. 13, the structure by which the recessed part 37 was formed in the surface facing the base metal 1 in the peripheral part of the 1st collar part 31 may be sufficient. Thereby, the joining strength between the peripheral part of the 1st collar part 31 and the joining material 2 can be improved.

  1 base metal, 2 bonding material, 3 rivets, 4 contact points, 5 collet for bonding, 11 through hole, 12 1st surface, 13 2nd surface, 21 1st bonding material, 22 2nd bonding material, 31 1st collar , 32 Leg part, 33 2nd collar part, 34 Concave part, 35 Concave part, 36 Concave part, 37 Concave part, 41 Concave part, 42 Concave part

Claims (7)

A base metal formed in a plate shape and having a through-hole formed in the plate thickness direction;
A bonding material provided on the first surface of the base metal;
A contact joined to the base via the joining material;
Opposing to the first surface and formed integrally with the first flange portion, the first flange portion provided in the bonding material, and integrally formed with the leg portion and the leg portion inserted into the through hole. And a rivet having a second collar portion facing the second surface of the base metal,
In the portion of the bonding material between the peripheral edge of the contact and the base metal, the first flange portion does not exist,
The bonding material is an electric contact that is pressed against the first surface by the rivet.   The electrical contact according to claim 1, wherein a portion of the bonding material overlapped with a peripheral portion of the contact is pressed against the first surface by the rivet.   3. The electricity according to claim 1, wherein a concavo-convex portion is formed on at least one of a surface of the first flange portion facing the contact point and a surface of the first flange portion facing the base metal. Contactor.   The recessed part is formed in at least one of the surface facing the said contact in the peripheral part of the said 1st collar part, and the surface facing the said metal plate in the peripheral part of the said 1st collar part. The electrical contact according to any one of 3 to 3. A first bonding material application step of applying a first bonding material to the first surface of the plate-shaped base metal;
After the first bonding material application step, a rivet leg portion insertion step of inserting a rivet leg portion into a through-hole formed in the base metal and overlapping the first brim portion of the rivet on the first bonding material; ,
After the rivet leg portion insertion step, a second bonding material is applied to the first flange portion and the first bonding material, and the first flange portion is interposed between the first bonding material and the second bonding material. A second bonding material application step to be disposed on,
After the second bonding material application step, the first bonding material is overlapped with the second bonding material, the contact, the first bonding material, and the second bonding material are compressed in the stacking direction and heated. And a contact bonding step of bonding the contact, the rivet and the base metal to each other via a bonding material made of the second bonding material,
After the contact joining step, the leg portion is deformed, and a leg deforming step for forming a second brim portion on the rivet facing the second surface of the base metal, and
In the leg deformation step, the bonding material is pressed against the first surface by the rivet.   The method for manufacturing an electrical contact according to claim 5, wherein the first bonding material and the second bonding material contain metal fine particles.   The method of manufacturing an electrical contact according to claim 6, wherein the metal fine particles are Ag fine particles or Cu fine particles.

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