JP5860639B2 - Low resistance metal fixed resistor manufacturing method - Google Patents

Description

  The present invention relates to a low resistance metal fixed resistor formed by combining a resistance element portion made of a resistance alloy and a connection terminal portion made of a metal conductor having high conductivity, and a manufacturing method with high productivity and bonding quality and low manufacturing equipment. .

In recent years, hybrid vehicles, electric vehicles, and fuel cell vehicles have been developed and put into practical use as vehicles that are environmentally friendly.
In such an automobile, the importance of the electrical module is increasing as compared with the prior art. A low-resistance metal fixed resistor, which is one of electronic passive components used there, is an important component having a function of detecting a current flowing through a circuit.

  The low-resistance metal fixed resistor is manufactured by bonding between different resistance bonding materials of a low-resistance metal material such as a Cu-Mn-Ni alloy or Ni-Cr alloy plate and a Cu plate as an electrode material.

However, rivet joining and spot welding for individually joining plate materials are difficult to meet future electric vehicles and the like due to productivity and cost, and the joining reliability is not high.
On the other hand, as a mass production method of such an electric resistor, as shown in Patent Document 1, a belt-like low-resistance metal material and a belt-like electrode material are continuously welded and then cut in the lateral direction. Proposed. As welding methods, electron beam welding and roller seam welding have been proposed.

  Electron beam welding requires high vacuum, resulting in poor productivity, large equipment, and high equipment costs. Furthermore, since it is a melting process, there is a problem that reliability of bonding quality is low depending on a combination of materials. Roller seam welding has the problem of poor electrical efficiency, large electrical equipment and expensive machinery. Moreover, since it is also a welding process, there exists a problem that the reliability of joining quality is low depending on the combination of materials.

  On the other hand, it is known that dissimilar metal plates and mold materials can be joined by friction stir welding. Friction stir welding does not require a vacuum and has the advantage that the equipment can be made smaller. However, the friction stir welding of the Cu—Mn—Ni alloy plate and the Cu plate and the butt friction stir welding of the Ni—Cr alloy plate and the Cu plate are not known.

  Further, in the butt friction stir welding of dissimilar metal plates, when joining materials having different high temperature deformation resistance, a material having a high temperature deformation resistance is applied to the advanced side (AS) with a high temperature deformation resistance for the purpose of increasing the bonding strength. It is known that a small material is disposed on the retreating side (RS) and joined along the butt line (Patent Document 2).

  In addition, in the friction stir welding of dissimilar materials, a high melting point material is arranged on the advanced side (AS) (Patent Document 3), a high softening temperature material is arranged (Patent Document 4), and a hard material is arranged (Patent) Document 5), it is known to arrange a material having a high temperature deformation resistance (Patent Document 6).

  However, in friction stir welding mainly consisting of a combination of a Cu-Mn-Ni alloy plate, which is a low-resistance metal material, and a metal conductor Cu plate having a high electrical conductivity, bonding becomes poor when bonded based on the above knowledge. Cannot be manufactured stably.

  Thus, when manufacturing a low resistance metal fixed resistor, in the said prior art, joining quality was not stabilized and there existed a subject in terms of productivity or equipment cost.

Japanese Patent Laid-Open No. 6-224014 JP 2004-34140 A Japanese Patent Laid-Open No. 11-58040 JP 2004-66331 A JP 2004-255420 A JP 2004-34140 A

  The present invention has been made in view of the above problems, and the purpose of the present invention is to produce a low-resistance metal fixed resistor such as a vehicle-mounted resistor that is expected to increase in demand in the future. It is an object of the present invention to provide a manufacturing method that is excellent in performance and inexpensive in manufacturing equipment.

The invention according to claim 1 is a method of manufacturing a low-resistance metal fixed resistor in which a resistance element portion made of a resistance alloy and a connection terminal portion made of a metal conductor having high conductivity are combined. The side surface of the thin plate-shaped body made of the resistance alloy and the side surface of the thin plate-shaped body made of the resistance alloy are abutted, the thin plate-shaped body made of the conductive metal is arranged on the AS (advance side), and the rotating shaft of the tool as the joining tool is electrically conductive Conductive friction stir welding is performed by embedding a probe of a rotating friction stir welding tool on a thin plate-like body made of a conductive metal or on a butt line , and moving the rotary probe parallel to the butt portion. A step of forming a thin plate-like body made of a metal and a thin plate-like body made of a resistance alloy and a thin plate-like body bonded to each other; and a process of slicing the combined thin plate-like body in a direction perpendicular to the joining direction. A method of manufacturing a low-resistance metal fixed resistor.

Invention of Claim 2 is a manufacturing method of the low resistance metal fixed resistor of Claim 1 , Comprising: The said resistance alloy is Mn (manganese) 10.0-13.0%, Ni (nickel) 1. A low resistance metal fixed resistor manufacturing method characterized in that 0 to 4.0%, the remainder is an alloy composed of Cu (copper) and inevitable impurities, and the metal conductor having high conductivity is pure copper. is there.

The present invention will be described in detail below.
The low resistance metal fixed resistor is an electric resistor made of a metal material having an electric resistance value of about several tens of μΩ to several mΩ used for measuring current as described above.

The low-resistance metal fixed resistor includes a connection terminal portion and a resistance element portion for measuring a current value.
Although there are various structures, it is preferable that the connection terminal portion / resistive element portion / connection terminal portion are each plate-like and joined in a single plane because it is easy to manufacture.

  The resistance alloy forming the resistance element portion is an alloy having an appropriate electrical resistance, and is a Cu—Mn alloy, a Ni—Cu alloy, a Ni—Cr alloy, a Fe—Cr alloy, a Mn—Cu—Ni alloy. Alloys are exemplified.

  An alloy consisting of Mn (manganese) 10.0 to 13.0%, Ni (nickel) 1.0 to 4.0%, the remainder being Cu (copper), and inevitable impurities is stable in electric resistance over a long period of time. This is particularly preferable because its temperature coefficient of resistivity is extremely small, heat conduction between locations where electrical connection is required is minimized, and strain sensitivity is low. In particular, an alloy composed of 86% copper, 12% manganese, and 2% nickel is called Manganin (trademark), but is preferable as a resistance material.

  The thin plate-like body made of the resistance alloy is obtained by processing the resistance alloy into a thin plate shape, and the thin plate-like body made of the resistance alloy preferably has at least a surface and a back surface parallel to each other. In order to manufacture a resistor in which each of the connecting terminal portion / resistive element portion / connecting terminal portion has a plate shape and is joined in a single plane, the surface is perpendicular to the surface of a thin plate made of a resistance alloy. It is preferable to have a substantially vertical flat side surface. Furthermore, since the electric resistance of the low-resistance metal fixed resistor is proportional to the length of the resistance alloy, the thin plate-like body made of the resistance alloy has two side surfaces perpendicular to or substantially perpendicular to the surface and having a certain distance from each other. It is preferable. Therefore, the thin plate-like body made of a resistance alloy is preferably a thin rectangular parallelepiped or a uniform strip. Although the dimensions are not limited, for example, the thickness is 0.3 mm to several mm, the width is several mm to 10 cm, and the length is 10 cm to several hundreds m.

Cu, Al, Ag, Au, and the like are exemplified as the metal conductor having high conductivity forming the connection terminal portion, but Cu is preferable from the viewpoint of stability and cost. A thin plate made of conductive metal is made by processing a metal conductor with high conductivity into a thin plate, and a thin plate made of conductive metal is parallel to the upper and lower surfaces and has a small interval, and is joined by butt contact. Therefore, it is preferable to have at least a planar side surface that is perpendicular or substantially perpendicular to the surface. Furthermore, it is preferable that the thin plate-like body made of a resistance alloy has two parallel side surfaces in terms of material efficiency, even if punched after joining with the resistance alloy. Therefore, the thin plate-like body made of a conductive metal is preferably a thin rectangular parallelepiped, a uniform-width strip or the like.
Although the dimensions are not limited, for example, the thickness is 0.3 mm to several mm, the width is several mm to 10 cm, and the length is 10 cm to several hundreds m.

  The thin plate-like resistance alloy and the thin plate-like metal conductor are usually combined and joined with the same thickness, but the thickness may be different. Rather, it is possible to combine a thin plate made of resistance alloys with different thicknesses and a thin plate of a metal conductor, and remove the overlay layer of the metal conductor formed on the resistance alloy after joining by friction stir welding by grinding or the like. It may be effective for controlling the electric resistance value to be constant. In this case, it is preferable that the thickness of the thin plate-like body made of a resistance alloy and the thickness of the metal conductor is different from several μm to several mm, preferably several tens μm to several hundred μm.

A friction stir welding tool (tool) used for friction stir welding is referred to as an end face of a cylindrical rotor at the tip of a tool body for applying a rotation and pressing force for friction stir welding, a shoulder face, And a pin-like probe protruding from the shoulder surface.
In the present invention, the shoulder surface is not limited. The outer periphery of the shoulder surface is preferably circular, and the shoulder surface is preferably a flat surface, a rotationally symmetric curved surface, or a spiral surface.

  To join the side surfaces of a thin plate body made of a resistance alloy and the thin plate body made of a conductive metal by friction stir welding, the side surfaces of the thin plate body made of a resistance alloy and the thin plate body made of a conductive metal are joined together. The probe of the friction stir welding tool rotating from the surface of the thin plate-like body is embedded in the butting portion or the butting portion or the vicinity thereof, and the portion below the shoulder surface and the probe is plasticized.

  In the present invention, the shape of the probe is not limited. Usually cylindrical, frustoconical, hemispherical, etc. are used, but in order to increase the stirring efficiency, a screw, a polygonal cross section, or a cutting blade that protrudes perpendicularly to the probe rotation axis may be used. Good.

  The material of the tool is not limited, but is preferably a material that can withstand continuous processing at a high temperature and is chemically compatible with a resistance alloy to be bonded or a metal conductor with high conductivity and hardly dissolves or reacts. preferable.

  The friction stirrer is not particularly limited, and includes a drive mechanism that rotates the friction stir welding tool, a drive mechanism that moves the tool in the direction of the rotation axis, and a load mechanism that applies a load in the direction of the rotation axis to embed the tool, It is preferable to have a moving mechanism that moves the thin plate relative to the tool rotation axis, and a locking mechanism that presses both plate-like bodies during processing. The moving axis is the surface plate axis (X). A machine consisting of three machine axes, a transverse axis (Y) and a lifting / lowering axis (Z), or four machine axes consisting of a surface plate axis (X), a transverse axis (Y), a lifting / lowering axis (Z), and a swing axis (A). Or those having a 5-axis control combined with the swivel axis (C) are preferably used. The back side of the thin plate in which the tool is embedded is used with a backing for supporting the load.

  Generally, the position of the rotating shaft of the friction stir welding tool (tool) for embedding the probe is not a butting surface (which appears as a butting line on the surface during processing), and is biased to one of the thin plates. Also good. This bias is called tool offset. The tool offset amount is the distance between the butt surface and the tool rotation axis. The amount of tool offset is preferably less than the radius of the probe.

  The embedded probes are sequentially joined by moving them parallel to the butting portion. By friction stir welding, mechanical strength is stable, electrically reliable, and inexpensive joining becomes possible.

  In general, as shown in FIG. 1, in friction stir welding, the side where the rotation direction of the probe coincides with the joining direction is referred to as “AS, forward side or advanced side (adv a nc ing s i d e) ”, while the side opposite this advancing side is referred to as“ RS, retreat side or retreating side (re ret ti ng s i d e) ”.

In order to join the side surfaces of a thin plate-like body made of a resistance alloy and a thin plate-like body made of a conductive metal, the thin plate-like body made of a conductive metal is arranged on the advanced side (AS) and butt friction stir welding is performed. Is preferred.
In particular, the resistance alloy is Mn (manganese) 10.0 to 13.0%, Ni (nickel) 1.0 to 4.0%, the remainder is Cu (copper), and an inevitable impurity, such as Manganin (trademark) ) That is, it is an alloy composed of Cu 86%, Mn 12%, Ni 2%, and when the metal conductor with high conductivity is Cu (copper), a copper thin plate is arranged on the advanced side (AS) and butt friction Stir welding is preferred.
This is because, in the reverse direction, it may not be possible to obtain a material with good bonding quality. The reason for this is not clear, but it is presumed that thermal conductivity is involved.

In this case, the center of the rotation axis of the tool is preferably on a thin plate-like body or a butting surface made of a conductive metal. This is because when the center of the rotation axis of the tool is on a thin plate-like body made of a resistance alloy, it may not be possible to obtain a product with good joining quality. The reason is that the wear of the probe is remarkable when the tool rotation axis is on the resistance alloy side.
Alternatively, it is presumed that an excessive increase in the bonding temperature due to an increase in the contact area between the tool and the resistance alloy having low thermal conductivity affects the bonding quality.

  Thus, a combined thin plate material is manufactured in which the side surfaces of the thin plate member made of a resistance alloy and the thin plate member made of a conductive metal are friction stir welded.

  The side surface of the thin plate-like body made of the conductive metal so that the thin plate-like body portion made of the resistance alloy is further sandwiched between the thin plate-like body made of the resistance alloy and the thin plate-like body made of the conductive metal. Are joined to the unjoined side surface of the thin plate made of resistance alloy, and the thin plate made of conductive metal is friction stir welded.

In addition, what was joined in this state is shredded by cutting, punching, or the like in a direction perpendicular to the joining direction, and a conductive metal piece is sandwiched between the resistance alloy at the other end of the resistance alloy. The resistor may be manufactured by bonding by means other than friction stir welding.
However, it is usually preferable that the second joint is also friction stir welded as follows.

  The side surface of the thin plate-like body made of the conductive metal so that the thin plate-like body portion made of the resistance alloy is further sandwiched between the thin plate-like body made of the resistance alloy and the thin plate-like body made of the conductive metal. Even when the thin plate-like body made of a resistance alloy is abutted against the unjoined side surface of the thin-plate body made of a resistance alloy and the thin plate-like body made of a conductive metal is friction stir welded, the thin plate-like body made of a resistance alloy and the thin plate-like body made of a conductive metal In order to join the side surfaces, it is preferable to arrange a rectangular thin plate-like body made of a conductive metal on the advanced side (AS) and butt friction stir weld.

In particular, the resistance alloy is Mn (manganese) 10.0 to 13.0%, Ni (nickel) 1.0 to 4.0%, the remainder is Cu (copper), and an inevitable impurity, such as Manganin (trademark) ) That is, it is an alloy composed of 86% Cu, 12% Mn, and 2% Ni. When the metal conductor having high conductivity is pure copper, a pure copper thin plate is disposed on the advanced side (AS) and butt friction stir welding It is preferable to do.
Even in this case, it is preferable that the center of the rotation axis of the tool is on a thin plate-like body or a butting surface made of a conductive metal. This is because when the center of the rotation axis of the tool is on a thin plate-like body made of a resistance alloy, it may not be possible to obtain a product with good joining quality.

In order to manufacture a resistor in which each of the connecting terminal portion / resistive element portion / connecting terminal portion has a plate shape and is joined in a single plane by using the above-described, What is necessary is just to manufacture the low resistance metal fixed resistor which joins the connection terminal part which consists of a metal conductor with high conductivity on both sides, and the side surface of the thin plate-like body made of one conductive metal and the parallel made of the resistance alloy And a parallel side surface of the thin plate-like body made of the resistance alloy, and a side surface of the rectangular thin plate-like body made of another conductive metal. A thin plate-like body made of one conductive metal by friction stir welding by embedding a probe of a friction stir welding tool that rotates in each butting portion and moving the rotating probe in parallel to the butting portion; Resistance Thin plate member made of alloy, a thin plate-like member made of other conductive metal can be formed side surfaces bound binding lamellar bodies in this order.
Thereafter, as will be described later, individual low-resistance metal fixed resistors can be obtained by chopping the combined thin plate members in a direction perpendicular to the joining direction.

  When the above-mentioned joining is performed, the friction stir welding portion of the thin plate-like body made of a conductive metal, the thin plate-like body made of a resistance alloy, and the thin plate-like body made of a conductive metal is made of a rectangular thin plate-like body made of a resistance alloy. Although there are two places on both side surfaces, bonding may be performed simultaneously or sequentially.

  Thus, a combined thin plate-like body is manufactured in which a thin plate-like body made of a conductive metal, a thin plate-like body made of a resistance alloy, and a thin plate-like body made of a conductive metal are joined in this order.

  Individual resistors can be obtained by chopping the combined thin plate-like body by cutting, punching, or the like in a direction perpendicular to its joining direction. For cutting, punching, etc., a method usually used for a metal plate, for example, press working or wire electric discharge machining can be used.

  According to the first aspect of the present invention, a low-resistance metal fixed resistor having a high connection strength and a stable connection strength that is excellent in productivity and does not become expensive due to friction stir welding is manufactured at low cost.

According to the invention of claim 2, the resistance element material is Mn (manganese) 10.0 to 13.0%, Ni (nickel) 1.0 to 4.0%, the remainder is Cu (copper), and unavoidable Since the connection terminal material is made of pure copper, a low-resistance metal fixed resistor having a low resistance temperature coefficient and stable quality can be manufactured at low cost.

It is typical explanatory drawing which shows AS and RS in friction stir welding. It is typical explanatory drawing which shows the tool offset in friction stir welding. 2 is a photograph of a connection part of Example 1. 6 is a photograph of a connection part of Example 2. 6 is a photograph of a connection part of Example 3. 7 is a photograph of a connection part of Example 4. 10 is a photograph of a connection part in Example 5. 14 is a photograph of the connection part of Example 6. 10 is a photograph of a connection part in Example 7. It is a schematic diagram showing a simple tensile test piece. 6 is a photograph of a connection part of Comparative Example 1. 6 is a photograph of a connection part of Comparative Example 2. 10 is a photograph of a connection part of Comparative Example 3. 10 is a photograph of a connection part in Comparative Example 4. It is a figure showing the dumbbell punching test piece shape of a tension test. It is a photograph of the connection part of Example 12. It is a photograph showing the state which measures electrical resistance. 10 is a photograph of a connection part joined by an electron beam in Comparative Example 5.

Hereinafter, the present invention will be further described with reference to examples of the present invention.
1. Examination of Friction Stir Welding Conditions Pure copper rectangular parallelepiped thin plates (plate thickness 2 mm, width 30 mm, length 200 mm) and manganin rectangular parallelepiped thin plates (plate thickness 2 mm width 30 mm, length 200 mm) were joined to each other by butt joining.
The friction stir welding tool (tool) is made of a Ni-based alloy, the shoulder surface is a disk having a diameter of 10 mm, the probe projects from the center of the shoulder surface, the diameter is 3 mm or 4 mm, and the height is 1.9 mm or A 0.9 mm cylindrical object was used.
The above tool was attached to and joined to a friction stir welding apparatus comprising four machine axes including a platen axis (X), a traversing axis (Y), a lifting axis (Z), and a swing axis (A).
Tool advance angle: Pressing load under conditions of 2 degrees or more: 500 kg weight (4903.3 N) to 700 kg weight (6864.7 N)
Tool rotation speed: 500-2000rpm
Tool moving speed: 100 to 500 mm / min
Tool offset: 0 to 1.5mm
The appropriate range was obtained by combining the conditions within the range, and joined within the appropriate range of the above combination.

Probe diameter 4mm
Probe length 1.9mm
1000 rpm
200mm / min
Pressing load: 700kg (6864.7N)
Pure copper sheet is placed on the advancing side.
Tool offset: 0.0mm
The results are shown in FIG. As shown in the photograph, the bonding was good in appearance.

Probe diameter 4mm
Probe length 1.9mm
1000 rpm
200mm / min
Pressing load: 700kg
Pure copper sheet is placed on the advancing side.
Tool offset: 1.1mm on the pure copper side
The results are shown in FIG. As shown in the photograph, the bonding was good in appearance.

Probe diameter 3mm
Probe length 1mm
1000 rpm
100mm / min
Pressing load: 500kg (4903.3N)
Pure copper sheet is placed on the advancing side.
The tool rotation axis is placed on a pure copper sheet.
Tool offset: 0.6mm on the pure copper side
The results are shown in FIG. As shown in the photograph, the bonding was good in appearance.

Probe diameter 3mm
Probe length 1.9mm
1000 rpm
100mm / min
Pressing load: 500kg (4903.3N)
Pure copper sheet is placed on the advancing side.
The tool rotation axis is placed on a pure copper sheet.
Tool offset: 0.6mm on the pure copper side
The results are shown in FIG. As shown in the photograph, the bonding was good in appearance.

Probe diameter 3mm
Probe length 1.9mm
1000 rpm
100mm / min
Pressing load: 500kg (4903.3N)
Pure copper sheet is placed on the advancing side.
The tool rotation axis is located on the butt line.
Tool offset: 0
The results are shown in FIG. As shown in the photograph, the bonding was good in appearance.

Probe diameter 3mm
Probe length 1.9mm
1500rpm
200mm / min
Pressing load: 500kg (4903.3N)
Pure copper sheet is placed on the advancing side.
The tool rotation axis is placed on a pure copper sheet.
Tool offset: 0.6mm
The results are shown in FIG. As shown in the photograph, the bonding was good in appearance.

Probe diameter 3mm
Probe length 1.9mm
1500rpm
200mm / min
Pressing load: 500kg (4903.3N)
Pure copper sheet is placed on the advancing side.
The tool rotation axis is located on the butt line.
Tool offset: 0
The results are shown in FIG. As shown in the photograph, the bonding was good in appearance.

The joint samples obtained in Examples 4, 5, 6, and 7 were arranged at the center in the length direction by wire electric discharge machining as shown in FIG. 10 to have a width of 27.6 to 28.9 mm and a length of 77 mm. Cut into a rectangular shape. Cutting was easy.
As a result, it is easy to cut in the orthogonal direction of the combined thin plate material in which the thin plate made of resistance alloy and the thin plate made of conductive metal joined by friction stir welding, and the electrodes are connected to both ends of the resistor. Similarly, it was confirmed that a resistor can be obtained by cutting in the orthogonal direction.
A simple tensile test was performed on the cut pieces. The results are shown in Table 1.

(Comparative Example 1)

In Example 1, it joined on the conditions similar to Example 1 except having changed into having arrange | positioned the manganin thin plate to the advanced side. Table 2 shows the joining conditions.
The results are shown in FIG. Disturbances were observed at the joint.
(Comparative Example 2)

In Example 2, the bonding was performed under the same conditions as in Example 2 except that the manganin thin plate was disposed on the advancing side. Table 2 shows the joining conditions.
The results are shown in FIG. Disturbances were observed at the joint.
(Comparative Example 3)

In Example 3, the joining was performed under the same conditions as in Example 3 except that a thin manganin plate was disposed on the advancing side. Table 2 shows the joining conditions.
The results are shown in FIG. Disturbances were observed at the joint.
(Comparative Example 4)

Probe diameter 3mm
Probe length 1.9mm
1500rpm
300mm / min
Pressing load: 500kg (4903.3N)
Manganin sheet is placed on the advancing side.
Tool offset: 0.3 mm on the manganin side
Table 2 shows the joining conditions. The results are shown in the photograph in FIG. An abnormal noise occurred when joining the arrows. When checked after joining, the probe part of the tool was broken.

(Examples 8 to 11)
Bonding was performed under the conditions shown in Table 2. The joint appearance was all good. The cut tensile strength was measured by wire electric discharge machining in the dumbbell shape shown in FIG. The results are shown in Table 2.

In this way, a strong and stable tensile strength is obtained by friction stir welding. In particular, friction is achieved by placing an electrode material such as pure copper on the advanced side (AS) and a rotation axis of the tool on the electrode material side such as pure copper. It was found that high-quality joining can be stably performed by stirring joining.
(Example 12)

Two pure copper rectangular parallelepiped thin plates (thickness 2 mm, width 37 mm, length 200 mm) and manganin rectangular parallelepiped thin plates (thickness 2 mm, width 10 mm, length 200 mm) were joined to the side surfaces of the thin plates under the following conditions. Butt joined.
The friction stir welding tool (tool) is made of a Ni-based alloy, the shoulder surface is a disk having a diameter of 10 mm, and the probe is a cylindrical shape having a diameter of 3 mm protruding from the center of the shoulder surface and a height of 1.9 mm. The thing of was used.
The above tool was attached to a known friction stir welding apparatus consisting of four machine axes including a platen axis (X), a transverse axis (Y), a lifting axis (Z), and a swing axis (A).
Tool advance angle: 2 degree pressing load: 500kg weight (4903.3N)
Tool rotation speed: 1400 rpm
Tool moving speed: 100 mm / min
Tool rotation axis: Tool offset on pure copper plate: 0.3 mm
Pure copper sheet is placed on the advancing side.
The tool rotation axis is placed on a pure copper sheet.

  Under the above conditions, a pure copper cuboid-shaped thin plate and a manganin cuboid-shaped thin plate were butted against each other and subjected to friction stir welding. Next, another pure copper cuboid-shaped thin plate was abutted against the other side surface of the manganin cuboid-shaped thin plate, and friction stir welding was performed under the above conditions to obtain a joined body in which the pure copper plate / manganin plate / pure copper plate was joined. FIG. 16 shows the appearance. A part of the joined body was cut into a dumbbell shape shown in FIG. 15 by wire electric discharge machining, and a tensile test was performed. The maximum tensile stress was 186 MPa, and the joint efficiency was 85%.

The electrical resistance was measured as shown in FIG. 17 for other dumbbell-shaped test pieces cut out in the same manner from the joined body. The electric resistance was 0.279 mΩ. The temperature coefficient of resistance was 256 ppm / K.
(Comparative Example 5)

  Two sheets of pure copper cuboid (thickness 2 mm, width 30 mm, length 200 mm) and manganin rectangular parallelepiped (thickness 2 mm, width 10 mm, length 200 mm) are used as the objects to be joined. The thin plate was sandwiched, and the side surfaces of the thin plate were butted together and bonded with an electron beam at a bonding speed of 2 m / min under vacuum. The appearance is shown in FIG. The electrical resistance was measured in the same manner for other dumbbell-shaped test pieces cut out from the joined body in the same manner as in Example 12. The electric resistance was 0.292 mΩ. The temperature coefficient of resistance was 230 ppm / K. The welded portion was grooved.

  Thus, the resistor obtained by Example 12 joined by friction stir welding with respect to the resistor obtained by joining with an expensive and large-sized electron beam apparatus has substantially the same electrical resistance and resistance temperature coefficient. An inferior one was obtained.

  According to the present invention, it is possible to manufacture a low-resistance metal fixed resistor whose demand will increase further in the future for vehicles and the like with high quality and stability at low cost.

Claims (2)

A method for manufacturing a low-resistance metal fixed resistor in which a resistance element portion made of a resistance alloy and a connection terminal portion made of a metal conductor having high conductivity are combined, and the side surface of the thin plate-like body made of a conductive metal and the resistance alloy A thin plate-like body made of a conductive metal is arranged on the AS (advancing side), and the rotation axis of a tool as a joining tool is on the thin plate-like body made of a conductive metal. A rotating friction stir welding tool probe is embedded on the butt line , and the rotary probe is moved in parallel to the butt portion to perform friction stir welding, and a thin plate-like body made of a conductive metal and resistance Low resistance metal fixing including a step of forming a bonded thin plate formed by joining a thin plate formed of an alloy and a step of cutting the bonded thin plate in a direction perpendicular to the bonding direction. Manufacturing method of resistors. It is a manufacturing method of the low resistance metal fixed resistor of Claim 1, Comprising: The said resistance alloy is Mn (manganese) 10.0-13.0%, Ni (nickel) 1.0-4.0%, and the remainder is A method of manufacturing a low-resistance metal fixed resistor, characterized in that it is an alloy composed of Cu (copper) and inevitable impurities, and the metal conductor having high conductivity is pure copper .