JPH11285861A - Cold press-contacting die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cold press-contacting die capable of mutually connecting wire rods having a different cross sectional shape. SOLUTION: This cold press-contacting die is provided with two pair of pair dies wherein a die hole is constituted of a pair of die segments 11, 13, (12, 14), and wire rods which are inserted into the die hole are joined by pressurizing both pair dies so as to come into contact. In such a case, at least the die hole in one side pair dies is formed into a tapered shape which becomes thin from an inserting side toward a projecting side of the wire rod. When the length of the tapered part in the tapered die hole is expressed by L, the thickness of the tapered part in the wire rod inserting side is expressed by D1 and the thickness of the wire rod in the wire projecting side is expressed by D2, the relation of these dimensions are expressed by the formula 5<=L/(D1/D2)<=15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die for cold pressure welding, and more particularly to a die for cold pressure welding capable of connecting wires having different cross-sectional shapes.

[0002]

2. Description of the Related Art As a conventional cold pressure welding machine, for example, one described in Japanese Patent Application No. 6-220964 is known. This is shown in FIG.
As shown in FIG. 6, two V-blocks 36 (FIG. 6) are provided opposite to each other on the upper portion of the frame 34, and a die 40 is incorporated between the V-blocks 36. By rotating the lever 32 (FIG. 5) pivotally supported by the frame 34, the two V-blocks 36 are pressed against each other, and the wire inserted between the dies 40 is pressed against the dies 40.

FIG. 7 shows the appearance of a die 40. This dice
40 is composed of four die pieces 41 to 44, of which two die pieces 41 and 42 are combined to form a die hole 45 for sandwiching one wire, and the other two die pieces 43 and 44 are combined to form the other. A die hole 45 for sandwiching the wire is formed. A total of four pins 46 are arranged between the adjacent die pieces, and the end of each pin 46 is
Inserted at 41-44. A screw 47 inserted from the back or side of the die is screwed into the pin 46 to connect the four die pieces 41 to 44, so that each chair piece can slide along the pin. The circular depression formed around the die hole 45 is a space 48 for releasing burrs generated at the time of pressing.

[0004] The V-block is assembled so that the inclined surface (side surface) of the die piece contacts the inclined surface of the V-block. When the V block is pressed, each die piece is pressed against the pressing direction to pinch the wire, and is further slid along the inclined surface of the V block so that the die piece can be moved in the die hole axial direction (the direction perpendicular to the V block pressing direction). It is pressed. Then, the two wires inserted into the die holes are pressed against each other.

[0005] By the way, such press machines are used to connect wires having the same cross-sectional shape. For example, a die for connecting a wire having a circular cross section has a circular cross section also for a die hole, and a die for connecting a wire having a flat cross section has a flat cross section of a die hole. It is configured as a rectangle.

[0006]

However, the dies used in the conventional pressure welding machine can only connect wires having the same cross-sectional shape, and cannot connect wires having different cross-sectional shapes. Accordingly, a main object of the present invention is to provide a die for cold welding capable of connecting wires having different cross-sectional shapes.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is characterized in that two pairs of dies forming a dice hole are provided by a pair of dice pieces, and both pair dies are pressed into contact with the dice hole. A die for cold pressure welding for joining inserted wires, wherein a die hole of at least one of the paired dies is formed in a tapered shape that becomes thinner from a wire insertion side toward a wire protrusion side.

The dice of the present invention is composed of a total of four dice pieces. Of these, a combination of a pair of dice pieces that form a dice hole by contacting each other is referred to as a pair dice. The cross-sectional shape of the wire to be connected includes various shapes such as a circle, an ellipse, a polygon, and a non-circle. However, the cross-sectional shape of the tapered die hole is preferably flat. In particular, by using a tapered die hole that changes from a rectangle having a large thickness to a rectangle having a small thickness, the end of the wire can be crushed flat and connected easily by pressure regardless of the cross-sectional shape of the wire.

For example, in the case where a wire having a circular cross section is connected to a wire having a flat shape, and the outer diameter of the circular wire is larger than the thickness of the flat wire, a die hole in a pair die for inserting the flat wire is formed. It has a uniform rectangular cross section in the longitudinal direction,
A die hole in a pair die into which a circular wire is inserted is formed in a tapered shape. The tapered die hole has a rectangular cross-section on the wire insertion side having a thickness greater than the circular wire outer diameter, and the wire protruding side corresponds to the cross-sectional shape of the flat wire to be connected to. What is necessary is just to make it the rectangular cross section which has a smaller thickness. With such a die, the end of the circular wire can be crushed flat and pressed against the flat wire.

As another example, there is a case where polygonal wires (for example, a square and a hexagon) having different cross-sectional shapes are connected to each other, and the opposite side dimensions are substantially equal. In this case, the dice holes of both pair dice are formed flat. That is, the wire insertion side may have a rectangular cross section having a thickness greater than the opposite side dimension of any wire, and the wire projecting side may have a rectangular cross section having a thickness smaller than the opposite side dimension of any wire. Also in this case, both wires can be pressed against each other by squashing the ends of the wires flat to have substantially the same cross-sectional shape.

When the length of the tapered portion in the tapered die hole is L, the thickness on the wire insertion side is D1, and the thickness on the wire protrusion side is D2, 5 ≦ L / (D1 / D2) ≦
It is desirable to set it to 15. In particular, 8 ≦ L / (D1 / D
2) ≦ 12 is a more preferred range. By forming the tapered die hole in such a dimensional relationship, the end portion of the wire rod is smoothly crushed, and the burden of operating the lever of the pressure welding machine can be further reduced.

[0012]

Embodiments of the present invention will be described below. FIG. 1 shows a die 10 of the present invention.
Each figure in (D) shows one die piece. (A),
(B) is a plan view, and (C) and (D) are cross-sectional views.
The two dice pieces 11 and 13 shown in (A) and (C) are one pair dice, and the two dice pieces 12 and 14 shown in (B) and (D) are the other pair dice. The difference from the dice shown in FIG. 7 resides in that the dice holes of the other pair dice are formed in a tapered shape, and the other points are the same as those of the conventional dice. .

This die is used for connecting a flat aluminum wire of 2 × 5.3 mm and a circular copper wire of 3.2 mm in diameter. Each of the dice pieces 11 and 13 constituting one pair dice (FIG. 1)
A, C) has a cutout 15 that forms a die hole by joining the two die pieces 11, 13 together. The notch 15 (die hole) includes a wire insertion portion 16 opened in a tapered shape and a flat portion 17 having a uniform cross section in the longitudinal direction. The notch 15 has a rectangular cross section, the depth of the flat portion 17 is approximately half (about 1 mm) the thickness of the flat aluminum wire, and the die hole formed when the two die pieces 11 and 13 are joined is flat. It was configured to correspond to the cross-sectional shape of the mold aluminum wire. The thickness of the opening edge of the wire insertion portion 16 when the two die pieces 11 and 13 were closed was about three times the thickness of the flat aluminum wire. As shown in FIGS. 1A and 1C and FIG. 2, a void 18 is formed on the wire projecting side of the die piece 11 so as to be depressed in a rectangular shape in order to release burrs when pressed.

The other pair of dies (FIGS. 1B and 1D) is composed of dice pieces 12 and 14 sandwiching a circular copper wire, and the cross section of the die hole is formed in a rectangular shape. It is formed in a flattened tapered shape. As shown in FIG. 1 (D), a notch forming a die hole
Reference numeral 21 denotes a steeply tapered wire insertion portion 22, a gentle tapered tapered portion 23, and a flat portion 24 on the wire projecting side. The depth of the cutout taper portion 23 on the wire insertion side is about 2 mm, and the depth on the wire protrusion side is about 1 mm. The opening edge of the wire insertion portion 22 is formed in a rectangular shape as shown in FIG. Further, the point that a gap 18 is formed on the wire protruding side for releasing the burr at the time of pressure contact is the same as in the above-mentioned one pair die.

The tapered portion in the notch of the die piece 14
As shown in FIG. 4, the bottom surface of 23 is formed with irregularities 24 to prevent the wire from slipping on the die during pressure welding. Such irregularities 24 are similarly formed on the other die pieces 11, 12, and 13.

Here, the length of the tapered portion 23 in the tapered die hole is L, the thickness of the tapered portion 23 on the wire insertion side (double the notch depth) is D1, and the thickness of the tapered portion on the wire projecting side is D1. To D
2, the die of this example has L = 21.4 mm and D1
= 4 mm and D2 = 2 mm, L / (D1 / D2) =
10.7. If this ratio is small, the decrease in the thickness of the tapered portion from the wire insertion side to the wire protrusion side is sharp,
It can be said that it is loose if it is large. When pressure welding was performed using dies having different ratios, 5 ≦ L / (D1 / D2) ≦ 1
A range of about 5 was easy to process. If the value is smaller than the lower limit value, a large force is required for pressure welding, and if the value is larger than the upper limit value, the pressure contact operation must be repeated many times, and the workability is reduced.

The pressure welding operation may be performed in the same manner as in the prior art by incorporating the die of the present invention into the cold pressure welding machine shown in FIG. A flat aluminum wire is inserted into the die holes of one pair of dies 11 and 13, and a circular copper wire is inserted into the die holes of the other pair of dies 12 and 14, and each wire is clamped by fingers 31. Lever for pressure welding
The operation is performed by rotating a cam, which will be described later, by the operation of 32, and operating the rocker arm 33 that swings with the rotation.

FIG. 6 shows the internal structure of the pressure welding apparatus. At a substantially center in the frame 34, a cam 35 having a concave portion and a convex portion
, And a lever 32 (see FIG. 5) is fixed to the rotation shaft. Further, on both sides of the frame 34, one end abuts the back surface of the V-block 36, and the other end is provided with a yoke 37, and a rocker arm 33 having a rotation shaft 38 near one end of the intermediate portion is opposed to the support. Have been. A roller 39 is provided on the yoke 37, and before pressing, the roller 39 is
It is engaged in 35 recesses.

Here, when the cam 35 is rotated by operating the lever 32, the roller 39 comes off the concave portion and comes into contact with the convex portion, and the other end of the rocker arm 33 is pushed out to both sides. Therefore, the rocker arm 33 acts as a lever,
The other end is moved toward the center of the frame and presses the V block 36. As a result, each of the die pieces 11 to 14 is pressed in the pressing direction, and further slid along the inclined surface of the V block 36 to be pressed in the die hole axial direction (the direction perpendicular to the V block pressing direction). Press the two wire rods inserted into the tube.

As described above, if the cross-sectional shape of the tapered die hole is formed to be a flat rectangle, the circular copper wire can be easily crushed and flattened, and the flat copper wire can be connected to the flat aluminum wire. Can be.

In the above description, a case in which a circular and a flat wire is pressed is described as an example. However, the connection object is not limited to such a cross-sectional shape. It can also be used for connection.

[0022]

As described above, according to the cold pressing die of the present invention, the die hole of at least one of the paired dies is formed in a tapered shape that becomes narrower from the wire insertion side toward the wire protrusion side. Wires having different cross-sectional shapes can be pressed.

[Brief description of the drawings]

FIG. 1 shows a die of the present invention, wherein (A) and (B) are plan views, and (C) and (D) are cross-sectional views.

FIG. 2 is a view of the die piece of FIG.

FIG. 3 is a view of the die piece of FIG.

FIG. 4 is a view of a cutout forming surface of the die piece of FIG. 1 (D).

FIG. 5 is an external perspective view of the cold welding machine.

FIG. 6 is an internal configuration diagram of the cold welding machine of FIG. 5;

FIG. 7 is an external perspective view of a conventional die.

[Explanation of symbols]

11,12,13,14,41,42,43,44 Die piece 15 Notch 16 Wire insertion part 17 Flat part 18 Void 21 Notch 22 Wire insertion part 23
Tapered part 24 Flat part 31 Finger 32 Lever 33 Rocker arm 34 Frame 35 Cam 36 V block 37 Yoke 38 Rotary shaft 39 Roller 40 Dice 45 Dice hole
46 pin 47 screw 48 air gap

Claims (3)

[Claims] 1. A cold pressure welding die comprising two pairs of a pair of dice forming a dice hole with a pair of dice pieces, pressing both paired dice and joining a wire inserted into the dice hole, wherein at least one of the paired dice Wherein the die hole is formed in a tapered shape that becomes narrower from the wire insertion side to the wire protrusion side. 2. The cold pressing die according to claim 1, wherein the cross-sectional shape of the tapered die hole is flat. 3. When the length of the tapered portion of the tapered die hole is L, the thickness of the tapered portion on the wire insertion side is D1, and the thickness of the tapered portion on the wire projecting side is D2, 5 ≦ L / (D1 / D2) ≦ 15. The die for cold pressure welding according to claim 1, wherein