TWI718010B - Contact piece, manufacturing method of contact piece, circuit breaker and switch - Google Patents

Abstract

A contact piece includes: a metal seat (3) having a first surface (3a), a second surface facing a direction opposite to the first surface (3a) and parallel to the first surface (3a), and a third surface (3c) perpendicular to the first surface (3a) and the second surface; a contact (4) fixed to the third surface (3c) of the metal seat (3); and a conductive member (5) allowing plastic flow, which is provided between the metal seat (3) and the contact (4), and has a hardness lower than the hardness of the contact. The surface of the contact (4) facing the direction opposite to the metal seat (3) has two first edges parallel to the normal direction of the first surface (3a), and a first cutoff (41) extending along the first edge is formed in at least a portion of the first edge.

Description

Contact, contact manufacturing method, circuit breaker and switch

The present invention relates to a contact piece, a method for manufacturing the contact piece, a circuit breaker and a switch with a contact point joined to a metal seat.

In the circuit breaker and the switch, a contact piece that switches the circuit break and conduction is used. The contact is provided with: contacts and metal seats for joining the contacts. The contact and the metal seat are formed of different materials. The joint is joined to the metal seat by soldering, resistance welding or riveting. In recent years, there have been cases where the contacts are joined to the metal base by ultrasonic welding. Ultrasonic bonding is to apply ultrasonic vibration to the contact by contacting the ultrasonic horn with the pressure of the metal seat and the contact in close contact. Ultrasonic bonding can eliminate the following disadvantages of soldering and resistance welding: the softening of the metal seat caused by heating, and the need for metal activating agents such as flux. Patent Document 1 discloses a technique in which a plurality of grooves are formed in a metal seat or a contact arrangement in order to suppress the displacement between the metal seat and the contact and improve the bonding strength of the ultrasonic bonding. [Prior Technical Literature] [Patent Literature]

Patent Document 1: Japanese Patent Laid-Open No. 60-250891

[The problem to be solved by the invention]

For circuit breakers and switches that use contacts, if an arc is generated between the contacts when the circuit is disconnected, the contacts will wear out, which may shorten the life of the circuit breaker and the switch. As in the technique disclosed in Patent Document 1, when a plurality of grooves are formed in a metal seat or contact arrangement, the electric field is concentrated at the tip of the grooves, and an arc is likely to be generated. In other words, when a plurality of grooves are formed in the metal seat or contact arrangement, there is a concern that the life of the circuit breaker and the switch will be shortened.

Especially, when using a circuit breaker that requires an instantaneous circuit breaker action when a large current flows, the contact wear caused by the arc generated during the circuit breaking is very large, so the contact surface before the circuit breaker is as free as possible without scratches or gaps. Better. When the contact is assembled as a contact with knurling, when the overcurrent flows and the circuit is interrupted, the electric field on the contact side will be concentrated on the groove formed by the knurling, and the arc will scatter. This part is the central significant consumption situation. As a result, the service life becomes shorter, and there is a concern that the service life of the contacts will be shortened.

The present invention is in view of the above-mentioned research and creation, and aims to obtain a contact which can suppress the displacement between the metal base and the contact point of the ultrasonic bonding and at the same time seek to extend the life of the circuit breaker and the switch. [Means to solve the problem]

In order to solve the above problems and achieve the objective, the present invention is characterized by having: a metal seat (3) having a first surface, a second surface facing the opposite direction to the first surface and parallel to the first surface, and a metal seat (3) perpendicular to The first surface and the third surface of the second surface; the contact point is fixed on the third surface of the metal base; and the plastic flowable conductive member is arranged between the metal base and the contact point and has lower hardness than the contact point The hardness; Among them, the face of the contact in the opposite direction to the metal seat has two first sides parallel to the normal direction of the first surface, and at least a part of the first side is formed to extend along the first side The first notch. [Invention Effect]

According to the present invention, it is possible to obtain a contact piece capable of suppressing the displacement between the metal seat and the contact point of the ultrasonic bonding, and at the same time, achieving a long life of the circuit breaker and switch.

Hereinafter, the contact, the manufacturing method of the contact, the circuit breaker and the switch of the embodiment of the present invention will be described in detail based on the drawings. In addition, the present invention is not limited by this embodiment.

Implementation type 1. Fig. 1 is a diagram showing a schematic configuration of a current-carrying part of a circuit breaker or switch using the contact of Embodiment 1 of the present invention. Regarding the parts other than the energized part of the circuit breaker or switch, a well-known technique can be used and the illustration is omitted.

The contact 1 shown in Fig. 1 is mainly used for low-voltage circuit breakers. In the following description, the case where it is used in a low-voltage circuit breaker is explained, but it can also be used in a high-voltage circuit breaker or a switch.

The contacts 1 used in the energizing part of the circuit breaker are roughly classified into the following two types: the contact 1a which is a fixed contact fixed to the housing of the circuit breaker, and the contact 1b which is a movable contact. A peeling mechanism 2 is connected to the contact 1b. When a current exceeding the design value flows between the contact pieces 1a and 1b, the contact piece 1b is moved by the peeling mechanism 2 to physically peel off the contact piece 1a to interrupt the current.

The contact 1 includes a contact 4 and a metal seat 3. In the example shown in Figure 1, one contact 1 is provided on the movable side and the fixed side one by one, but the number can be changed appropriately according to the voltage and current that must be disconnected. For example, it may be configured such that there is one contact 1 on the fixed side and two or more contacts 1 on the movable side. There may be one contactor 1 on the movable side and two or more contactors 1 on the fixed side. The contact 1 can be used on the movable side or on the fixed side.

Figure 2 is a side view of the contact member of the first embodiment. Fig. 3 is a view of the contact member viewed along the arrow III shown in Fig. 2. Fig. 4 is a diagram of the contact member viewed along the arrow IV shown in Fig. 2. Figure 5 is a cross-sectional view along the line V-V shown in Figure 3.

The metal seat 3 has: a first surface 3a; a second surface 3b facing opposite to the first surface 3a and parallel to the first surface 3a; and a third surface 3c perpendicular to the first surface 3a and the second surface 3b. The first surface 3a and the second surface 3b are parallel to the direction in which the metal seat 3 and the contact point 4 overlap and extend from the contact point 4 toward the peeling mechanism 2.

The contact 4 is joined and fixed to the third surface 3c of the metal base 3. The contact 4 and the metal seat 3 are generally composed of different metals. There is an intermediate metal 5 at the interface between the contact 4 and the metal seat 3, and the intermediate metal 5 has a lower hardness than the contact 4 and is plastically fluid. The intermediate metal 5 is a conductive member.

The face of the contact 4 facing the opposite direction to the metal seat 3 is a rectangular shape, and has two first sides 4a parallel to the normal direction of the first surface 3a, and the ends of the two first sides 4a Two second sides 4b connected to each other. The first side 4a is the short side of the rectangle, and the second side 4b is the long side of the rectangle.

A notch 41 is formed on the first side 4a, and the notch 41 is a first notch extending along the first side 4a. The notch 41 may be formed on both sides of the two first sides 4a, or only on one of the first sides 4a. On the surface facing the side opposite to the metal seat 3 of the contact 4, uneven portions other than the notched portion 41 are not formed.

Let the width of the space between the first surface 3a and the second surface 3b of the metal seat 3 be t. Let L be the maximum length of the metal seat 3 parallel to the second side 4b of the contact 4. Let the maximum length of the contact 4 along the first side 4a be a. Let the maximum length of the contact 4 along the second side 4b be b. Let the length of the contact 4 along the direction in which the metal seat 3 and the contact 4 overlap with c. Let the maximum length of the notch 41 along the first side 4a be a ₁ . Let the maximum length of the notch 41 along the second side 4b be b ₁ . Let c _{1 be} the length of the notch 41 along the direction in which the metal seat 3 and the contact 4 overlap.

In this case, it is set as follows: a ₁ ≦a, b ₁ <0.5b, and c ₁ <c. In order to stably fix the metal seat 3 during the pressurization period when ultrasonic vibration is applied, it is preferable that the notches 41 formed on the two first sides 4a are equal to a ₁ , b ₁ , and c ₁ . However, the most appropriate values of a ₁ , b ₁ , and c ₁ are determined according to the shape of the contact 4, and therefore, the respective sizes of the notches 41 do not necessarily have to be the same.

Since the contact area between the contact point 4 of the fixed-side contact piece 1a and the contact point 4 of the movable-side contact piece 1b is larger, the smaller the notch 41 provided in the contact point 4 is, the better. The maximum length b _{1 of the} notch 41 has a great influence on the contact area between the contacts 4, so it is better to set it as small as possible. As an example, assuming that the maximum length of the contact 4 a = 5 mm, the width t = 5 mm of the metal seat 3, the maximum length b = 8 mm, and the length c = 3 mm, set it as: a ₁ ≦5mm, b ₁ ＜4mm, c ₁ ＜3mm.

In addition, in the examples shown in FIGS. 2 to 4, the notch 41 formed in the first side 4a is formed symmetrically with the center line 50 of the first side 4a as the center. In addition, as shown in Figure 5, the notch 41 is formed with a face parallel to the first side 4a and a face parallel to the third face 3c, and a face parallel to the first side 4a and a third face The face 3c is parallel and the face is perpendicular to each other. The above-mentioned shape of the notch portion 41 is made such that the shape of the notch portion 41 is a rectangular shape.

In addition, the shape of the metal seat 3 is not limited to a quadrangular pillar shape, and may be a cylindrical shape, an elliptical pillar shape, a polygonal pillar shape, or a combination of these shapes. The contact 4 is set in the shape of a quadrangular column, but it can also be a cylindrical shape or a chamfered corner. In addition, the surface of the contact 4 on the opposite side of the metal seat 3 may also be arc-shaped, such as a circular arc surface or a spherical surface. Alternatively, it may be a combination of these shapes.

Fig. 6 is a side view of the contact of a modification of the first embodiment. Fig. 7 is a view of the contact member viewed along the arrow VII shown in Fig. 6. Fig. 8 is a view of the contact member viewed along the arrow VIII shown in Fig. 6. Figure 9 is a cross-sectional view taken along the line IX-IX shown in Figure 7. In the contact 1 of Modification 1, the notch portion 41 is formed in a chamfered shape of the first side 4a by chamfering. More specifically, it has a flat chamfered shape.

As shown in Fig. 6, if the chamfering angle of the notch 41 is θ ₁ , it is set to 0°<θ ₁ <90°. In order to stably fixed to the metal holder during the pressing time of applying ultrasonic vibration 3, 4a formed on both side of cutout portion 41 of the system with one another preferably equal to θ _1. However, the most appropriate values of a ₁ , b ₁ , and c ₁ are determined according to the shape of the contact 4, so the θ _{1 of the} notch portions 41 does not necessarily have to match each other. In addition, a chamfered notch 41 may be formed on one first side 4a, and a rectangular notch 41 may be formed on the other first side 4a.

FIG. 10 is a diagram showing the schematic configuration of the contact in Modification 2 of Embodiment 1, and is a diagram corresponding to the view in which the contact is viewed along the arrow VII shown in FIG. 6. In the contact 1 of Modification 2, the notch 41 is formed so as to cover the entire length of the first side 4a of the contact 4. The shape of the notch 41 may be a rectangular shape or a chamfered shape.

Fig. 11 is a side view of the contact of Modification 3 of Embodiment 1. Fig. 12 is a view of the contact point viewed along the arrow XII shown in Fig. 11. Figure 13 is a cross-sectional view taken along the line XIII-XIII shown in Figure 11.

In the contact 1 of the modification 3, in addition to the first side 4a of the contact 4, a notch 43 is formed on the second side 4b, and the notch 43 is a second notch extending along the second side 4b. The notch 43 is formed in a chamfered shape of the second side 4b by chamfering. More specifically, it has a flat chamfered shape. The notch 43 may be formed on both sides of the two second sides 4b, or may be formed only on one of the second sides 4b. Concave and convex parts other than the notches 41 and 43 are not formed on the surface of the contact 4 on the opposite side to the metal seat 3.

In addition, the maximum length of the notch 43 along the first side 4a is a ₃ . Let the maximum length of the notch 43 along the second side 4b be b ₃ . Let the chamfering angle of the notch 43 be θ ₃ . And it is set as follows: a ₃ <0.5a, b ₃ ≦b, and 0°<θ ₃ <90°. For example, in the case where the width t of the metal seat 3 = 5 mm, the maximum length b = 8 mm, and the length c = 3 mm, it is set as follows: a ₃ <2.5 mm, b ₃ ≦8 mm, and 0°<θ ₃ <90°. In order to stably fix the metal seat 3 during the pressurization period when the ultrasonic vibration is applied, it is preferable that the notches 43 formed on the two second sides 4b are the same as a ₃ , b ₃ , and θ ₃ . However, the most appropriate values of a ₃ , b ₃ , and θ ₃ are determined according to the shape of the contact 4. Therefore, the respective a ₃ , b ₃ , and θ _{3 of the} notches 43 do not necessarily match each other. In addition, a chamfered notch 43 may be formed on one second side 4b, and a rectangular notch 43 may be formed on the other second side 4b.

Figure 14 is a side view of the contact of Modification 4 of Embodiment 1. Fig. 15 is a view of the contact member viewed along the arrow XV shown in Fig. 14. Figure 16 is a cross-sectional view taken along the line XVI-XVI shown in Figure 14. In the contact 1 of Modification 4, the notch 43 is formed so as to cover the entire length of the second side 4b of the contact 4. The shape of the notch 43 may be a chamfered shape as shown in FIGS. 14 to 16 or a rectangular shape. In addition, the notch 41 may be simultaneously formed so as to cover the entire length of the first side 4a of the contact 4.

Figure 17 is a side view of the contact of Modification 5 of Embodiment 1. Figure 18 is a cross-sectional view taken along the line XVIII-XVIII shown in Figure 17. Figure 19 is a view of the contact member viewed along the arrow IXX shown in Figure 18.

In the contact 1 of Modification 5, the recess 31 is formed on the first surface 3a and the second surface 3b of the metal seat 3. The maximum length of the metal seat 3 along the direction in which the metal seat 3 overlaps the contact 4 is W. The distance between the bottom surface of the recess 31 formed on the first surface 3a of the metal seat 3 and the bottom surface of the recess 31 formed on the second surface 3b is t1. The maximum length of the recess 31 along the second side 4b is L1. The maximum length of the recess 31 in the direction in which the metal seat 3 overlaps the contact 4 is W1. And set it as: t1<0.5t, b≦L1<L, W1<W. In addition, by setting b<L, the metal seat 3 can be further stably fixed. The recessed portion 31 formed on the first surface 3a and the recessed portion 31 formed on the second surface 3b may have the same shape or different shapes.

Hereinafter, the method of manufacturing the contact 1 and the configuration of the manufacturing device will be described. Fig. 20 is a front view showing a schematic configuration of the contact manufacturing apparatus of Embodiment 1. Fig. 21 is a side view showing the schematic configuration of the contact manufacturing apparatus of Embodiment 1. FIG. 22 is a flowchart showing the manufacturing method of the contact of Embodiment 1.

First, the metal seat 3 formed by forming a shape using press processing, cutting processing, forging processing, or the like is fixed to a fixing table 6 of a joining device 7 as a manufacturing device. In this step, the metal seat 3 is inserted and installed between the movable portion 6a and the fixed portion 6b included in the fixed table 6 (step S1). Next, the movable part 6a is moved, and the metal base 3 is clamped and fixed by the movable part 6a and the fixed part 6b (step S2).

The movable part 6a can be moved by screws, air pressure mechanism, hydraulic mechanism, etc., and can apply pressure to the metal seat 3. The fixing portion 6b is fixed to the joining device 7. The movable portion 6a is configured to press the metal seat 3 directly below the junction between the metal seat 3 and the contact 4.

As in the contact 1 of Modification 5 shown in Figs. 17 to 19, when the recessed portion 31 is formed in the metal base 3, the movable portion 6a and the fixed portion 6b are formed in advance to engage with the recessed portion 31, thereby The metal seat 3 can be fixed more firmly. In addition, a configuration in which the concave portion 31 is not formed in the metal base 3 in advance, but is sandwiched by the movable portion 6 a and the fixed portion 6 b formed with convex portions, thereby forming the concave portion 31 in the metal base 3. In addition, the joining device 7 may be provided with a plurality of movable parts 6a, and the metal seat 3 may be clamped and fixed by the plurality of movable parts 6a.

Next, the contact 4 is set on the third surface 3c of the metal seat 3 (step S3). The contact point 4 is arranged so that the surface on which the intermediate metal 5 is formed faces the third surface 3c. In addition, the intermediate metal 5 may also be formed on the third surface 3c of the metal seat 3.

Next, the contact 4 is pressurized toward the metal base 3 side by the pressing tool 8 of the joining device 7 and ultrasonic vibration is applied, thereby joining the contact 4 to the metal base 3 (step S4). When the contact point 4 is pressurized and ultrasonic vibration is applied, the interface between the metal base 3 and the contact point 4 rubs against each other, destroys the oxide film, and mixes the interface, thereby joining the two.

With the above-mentioned manufacturing method, the contact 4 and the metal base 3 can be joined even without using a metal activator such as a flux or solder, and the manufacturing cost due to the abolition of the cleaning step can be achieved. , Reduction of material cost and improvement of electrical conductivity.

In ultrasonic bonding, vibration with a small amplitude of 20 kHz or more is applied, and the contact 4 is likely to be inclined or displaced during the bonding process. In order to suppress the inclination and displacement of the contact 4, knurling or the like may be formed on the contact 4 and the metal seat 3 to form a plurality of grooves. However, when a plurality of grooves are aligned and formed on the contact 4 and the metal seat 3, the electric field is concentrated on the tip of the groove, and an arc is likely to be generated. Since an arc is prone to occur, the temperature rises when receiving power, which may shorten the life of the circuit breaker and switch using the contact 1. In addition, there is a concern that the grooves required for joining such as knurling may become the starting point of failure, and there is a concern that the rigidity of the contact 4 itself may decrease.

On the other hand, in the first embodiment, the portion of the pressing tool 8 that is in contact with the contact 4 is formed with convex portions that fit the notches 41 and 43 formed in the contact 4. During pressurization and when ultrasonic vibration is applied, the convex portion of the pressurizing tool 8 fits into the notches 41, 43 formed in the contact 4, so that the contact 4 can be prevented from tilting or displacement. That is, without providing knurling or chevron shapes on the contact 4 and the metal seat 3, the contact 4 can be prevented from tilting or causing displacement. Therefore, the occurrence of arcs in the circuit breaker and switch using the contact 1 is suppressed, the temperature rise during energization is suppressed, the rigidity of the contact 4 itself is suppressed from decreasing, and the life of the circuit breaker and switch can be prolonged.

In addition, when the contact point 4 in which only the notch portion 41 is formed is used, the pressing tool 8 may be formed with a convex portion that fits with the notch portion 41. In addition, it is also possible that the contact 4 before joining with the metal seat 3 is not formed with the notches 41, 43, and the pressing tool 8 is used to apply pressure and ultrasonic vibration, and the result will be formed on the convex part of the pressing tool 8. The shape of φ is transferred to form the notches 41, 43.

In addition, the width t of the metal seat 3 is set to be longer than the maximum length of the first side 4a of the contact 4, thereby suppressing the inclination and displacement of the contact 4, but it will give dimensional constraints, This reduces the design freedom of the contact 1 or causes the contact 1 to increase in size. In contrast, in the present embodiment, the inclination and displacement of the contact 4 can be suppressed without imposing dimensional constraints. Therefore, it is possible to suppress the decrease in the design freedom of the contact 1 or to suppress the enlargement of the contact 1.

Moreover, if the notch 41 is formed symmetrically with the center line 50 of the first side 4a as the center, when the convex portion is fitted into the notch 41 and pressed by the pressing tool 8, the contact will be further increased. 4It is difficult to generate tilt.

When the notch portions 41 and 43 are formed into rectangular shapes, the convex portions of the pressing tool 8 are more deeply embedded, so that the inclination and displacement of the contact point 4 can be further reliably suppressed. When the shapes of the notch portions 41 and 43 are chamfered shapes, the amount of processing required for the formation of the notch portions 41 and 43 can be suppressed, and the manufacturing cost can be suppressed.

In addition, when the notches 41 and 43 are formed so as to cover the entire length of the first side 4a or the second side 4b, the contact can be pressed by the entirety of each side, so that the contact 4 is more difficult to tilt. When the notch portions 41, 43 are formed so as to cover the full length of the first side 4a or the second side 4b, compared with the case where the notch portions 41, 43 are formed in a part of the first side 4a or the second side 4b, hairiness can be suppressed. The production of burr. Furthermore, in addition to the notch portion 41, the notch portion 43 is formed, and this makes it difficult for the contact 4 to incline and shift compared with the case where only the convex portion is inserted into the notch portion 41.

Contact 4 is a metal with relatively high hardness using at least a part of a sintered material made of silver and tungsten, tungsten carbide or graphite, or a combination of at least two of silver and tungsten, tungsten carbide and graphite. The formation is better. In addition, the metal seat 3 is preferably formed of electrolytic copper or oxygen-free copper. It is better to use silver for the intermediate metal 5 series. The intermediate metal 5 can be formed on the contact 4 in advance by a vacuum evaporation method, a plating method, or the like. In addition, the intermediate metal 5 can be formed on the metal base 3 in advance by a vacuum evaporation method, a plating method, or the like. In addition, the intermediate metal 5 may be separated due to the difference in specific gravity in the constituent materials during the manufacture of the contact 4, and it may also be formed on the surface of the contact 4 on the metal seat 3 side.

Since the contact 4 uses a high-hardness sintered metal material, when the contact 1 is used to interrupt the current, the wear of the contact 4 can be minimized. Since the silver used in the intermediate metal 5 and the electrolytic copper or oxygen-free copper used in the metal seat 3 are metals that are easy to plastically flow, when the two are combined by ultrasonic bonding, the two will undergo plastic flow and not only cause the interface The oxide on the surface is easier to destroy, and the joint strength can be increased by mixing the two at the interface.

Since the contact 1 has no solder material, there is no need for a metal active material like flux during joining. This not only reduces manufacturing and material costs, but also increases the temperature of the contact 1 to the equivalent of soldering even when the current is interrupted. In the case of temperature or exposure to an atmospheric environment equivalent to the temperature of soldering, the welding material will not melt and flow out, and the temperature resistance characteristics of electrical contacts can be improved. Furthermore, since the silver used in the intermediate metal 5 and the electrolytic copper or oxygen-free copper used in the metal base 3 are metals that are easy to plastically flow, when the two are joined by ultrasonic bonding, the two will flow plastically. It not only makes the oxide on the interface easier to destroy, but also increases the bonding strength by mixing the two at the interface.

Figure 23 is a side view of the contact of Modification 6 of Embodiment 1. Figure 24 is a view of the contact member viewed along the arrow XXIV shown in Figure 23. Figure 25 is a view of the contact member viewed along the arrow XXV shown in Figure 23.

In the contact point 4 of Modification 6, notch portions 41 are formed at both ends of the first side 4a. In other words, notches 41 are formed at the four corners of the quadrangle formed by the first side 4a and the second side 4b, respectively. The lengths a ₁ , b ₁ , and c ₁ of the notch 41 can be appropriately changed according to the shape and size of the contact 4. In addition, the lengths a ₁ , b ₁ , and c _{1 of} each notch 41 may all be the same or different.

A notch 43 is formed in the contact 4, and the notch 43 is formed by chamfering the second side 4b so as to cover the entire length of the second side 4b. The length a ₃ and the angle θ _{3 of the} notch 43 can be set arbitrarily.

If the notch 41 is formed at both ends of the first side 4a, and the protruding part that is inserted into the notch 41 is formed in the pressing tool 8, the both ends of the first side 4a can be used, that is, the first side At the four corners of the quadrangle formed by 4a and the second side 4b, the convex part is fitted into the notch part 41 to fix the contact 4. As a result, the inclination and displacement of the contact 4 when the contact 4 is ultrasonically bonded to the metal base 3 can be suppressed more firmly.

In addition, since the notch 41 only needs to be formed at the four corners, the size of the notch 41 can be further reduced. Thereby, the volume reduction of the contact 4 due to the notch 41 can be suppressed, and when the contact 1 is used as a contact for a circuit breaker or opening and closing gas, the temperature rise during energization and the contact 4 can be suppressed. The effect of the rigidity reduction.

In addition, if the notches 41 are provided at the four corners, the above-mentioned effects can be obtained, so the notches 43 are not necessarily formed.

Fig. 26 is a side view of the contact of Modification 7 of Embodiment 1. Figure 27 is a view of the contact member viewed along the arrow XXVII shown in Figure 26. Fig. 28 is a view of the contact member viewed along the arrow XXVIII shown in Fig. 26.

In the contact point 4 of Modification 7, the chamfered notch 41 of the length b ₁ and the angle θ ₁ is formed to cover the entire length of the first side 4 a. Furthermore, a chamfered notch 43 having a length a ₃ and an angle θ ₃ is formed to cover the entire length of the second side 4 b. At this time, the angle θ ₁ and the angle θ ₃ may be the same or different. The length b ₁ and the angle θ _{1 of the} notch portion 41 and the length a ₃ and the angle θ ₃ of the notch portion 43 can be appropriately changed according to the shape and size of the contact 4.

The notch portions 41, 43 are formed on the full length of the first side 4a and the second side 4b. Therefore, if the pressing tool 8 forms convex portions that fit into the notch portions 41, 43, the convex portions can be fitted into the notch portion 41. , 43 and fixed contact 4. As a result, the inclination and displacement of the contact 4 when the contact 4 is ultrasonically bonded to the metal base 3 can be suppressed more firmly.

In addition, if the convex portion formed on the pressing tool 8 is in a range where the displacement of the contact 4 can be suppressed, the angles θ ₁ and θ ₃ of the chamfered shape of the notch portions 41 and 43 are reduced as much as possible so that the notch portions 41 and It is better to reduce the size of 43. This can suppress the reduction in the volume of the contact 4 due to the provision of the notch 41, and when the contact 1 is used as a contact for a circuit breaker or opening and closing gas, it is possible to more reliably suppress the temperature rise during energization. The effect of reducing the rigidity of the contact.

The configuration shown in the above-mentioned embodiments shows an example of the content of the present invention, and may be combined with other known technologies, and part of the configuration may be omitted or changed without departing from the scope of the present invention.

1, 1a, 1b: Contact 2: Peeling mechanism 3: Metal seat 3a: First side 3b: Second side 3c: Third side 4: Contact 4a: First side 4b: Second side 5: Intermediate metal 6 : Fixed base 6a: movable part 6b: fixed part 7: joining device 8: pressing tool 31: recessed part 41, 43: notch part 50: center line a, a ₁ , a ₃ , b, b ₁ , b ₃ , c , C ₁ , L, W, W1: length θ ₁ , θ ₃ : angle t: width t1: distance

Fig. 1 is a diagram showing a schematic configuration of a current-carrying part of a circuit breaker or switch using the contact of Embodiment 1 of the present invention. Figure 2 is a side view of the contact member of the first embodiment. Fig. 3 is a view of the contact member viewed along the arrow III shown in Fig. 2. Fig. 4 is a diagram of the contact member viewed along the arrow IV shown in Fig. 2. Figure 5 is a cross-sectional view along the line V-V shown in Figure 3. Figure 6 is a side view of the contact of Modification 1 of Embodiment 1. Fig. 7 is a view of the contact member viewed along the arrow VII shown in Fig. 6. Fig. 8 is a view of the contact member viewed along the arrow VIII shown in Fig. 6. Figure 9 is a cross-sectional view along the line IX-IX shown in Figure 7. FIG. 10 is a diagram showing the schematic configuration of the contact in Modification 2 of Embodiment 1, and is a diagram corresponding to the view in which the contact is viewed along the arrow VII shown in FIG. 6. Fig. 11 is a side view of the contact of Modification 3 of Embodiment 1. Fig. 12 is a view of the contact member viewed along the arrow XII shown in Fig. 11. Figure 13 is a cross-sectional view along the line XIII-XIII shown in Figure 11. Figure 14 is a side view of the contact of Modification 4 of Embodiment 1. Fig. 15 is a view of the contact member viewed along the arrow XV shown in Fig. 14. Figure 16 is a cross-sectional view along the line XVI-XVI shown in Figure 14. Figure 17 is a side view of the contact of Modification 5 of Embodiment 1. Figure 18 is a cross-sectional view along the line XVIII-XVIII shown in Figure 17. Figure 19 is a view of the contact member viewed along the arrow IXX shown in Figure 18. Fig. 20 is a front view showing a schematic configuration of the contact manufacturing apparatus of Embodiment 1. Fig. 21 is a side view showing the schematic configuration of the contact manufacturing apparatus of Embodiment 1. FIG. 22 is a flowchart showing the manufacturing method of the contact of Embodiment 1. Figure 23 is a side view of the contact of Modification 6 of Embodiment 1. Figure 24 is a view of the contact member viewed along the arrow XXIV shown in Figure 23. Figure 25 is a view of the contact member viewed along the arrow XXV shown in Figure 23. Fig. 26 is a side view of the contact of Modification 7 of Embodiment 1. Figure 27 is a view of the contact member viewed along the arrow XXVII shown in Figure 26. Fig. 28 is a view of the contact member viewed along the arrow XXVIII shown in Fig. 26.

1: Contact

3: Metal seat

3a: First side

3c: Third side

4: contact

41: Notch

4b: second side

5: Intermediate metal

b, b ₁ , c, c ₁ , L: length

Claims (30)

A contact piece is provided with: a metal seat with a first surface, a second surface facing the opposite direction to the first surface and parallel to the first surface, and a metal seat perpendicular to the first surface and the second surface The third surface; the contact point is fixed to the aforementioned third surface of the aforementioned metal seat; and the intermediate metal that can be used for plastic flow is arranged between the aforementioned metal seat and the aforementioned contact point, and the hardness is lower than that of the aforementioned contact point ; The face of the contact point facing the opposite direction to the metal seat has two first sides parallel to the normal direction of the first surface, and at least a part of the first side is formed along the first side The extended first notch. The contact according to claim 1, wherein the first notch portion is formed symmetrically with the center portion of the first side as the center. The contact piece according to the first item of the scope of patent application, wherein, when viewed along the normal direction, at least one of the first notches has a rectangular shape. The contact piece according to the second item of the scope of patent application, wherein, when viewed along the normal direction, at least one of the first notches has a rectangular shape. As described in the first item of the scope of patent application, at least one of the first notches is chamfered when viewed along the normal direction. The contact piece according to the second item of the scope of patent application, wherein, when viewed along the normal direction, at least one of the first notches is chamfered. The contact piece according to the first item of the scope of patent application, wherein the first notch is formed at both ends of the first side. The contact according to any one of items 1 to 6 in the scope of the patent application, wherein the first notch portion is formed to cover the full length of the first side. The contact according to any one of items 1 to 7 in the scope of the patent application, wherein the contact point has a second side connecting the ends of the two first sides, and at least a part of the second side A second notch part extending along the aforementioned second side is formed. The contact piece described in claim 8, wherein the contact point has a second side connecting the ends of the two first sides, and at least a part of the second side is formed along the first side A second notch extending from two sides. According to the contact piece described in item 9 of the scope of the patent application, the second notch portion is formed to cover the full length of the second side. According to the contact piece described in claim 10, the second notch is formed to cover the full length of the second side. The contact piece as described in item 9 of the scope of patent application, wherein the aforementioned second notch is chamfered. The contact piece according to claim 10, wherein the aforementioned second notch is chamfered. The contact piece described in item 11 of the scope of patent application, wherein the aforementioned second notch is chamfered. The contact piece according to item 12 of the scope of patent application, wherein the aforementioned second notch is chamfered. The contact as described in item 1 of the scope of patent application, wherein the aforementioned first notch is It is formed to cover the entire length of the first side, the contact point has a second side connecting the ends of the two first sides, and a first side extending along the second side is formed over the entire length of the second side. Two notches, the first notch and the second notch are chamfered shapes. The contact according to claim 9, wherein the first surface is formed with a concave portion along the second side that is longer than the length of the second side. The contact according to claim 10, wherein the first surface is formed with a concave portion along the second side that is longer than the length of the second side. The contact piece described in claim 11, wherein the first surface is formed with a concave portion along the second side that is longer than the length of the second side. According to the contact piece described in claim 12, the first surface is formed with a concave portion along the second side that is longer than the length of the second side. The contact according to claim 13, wherein the first surface is formed with a concave portion along the second side that is longer than the length of the second side. The contact according to claim 14, wherein the first surface is formed with a concave portion along the second side that is longer than the length of the second side. The contact according to claim 15, wherein the first surface is formed with a concave portion along the second side that is longer than the length of the second side. The contact piece described in claim 16, wherein the first surface is formed with a concave portion along the second side that is longer than the length of the second side. According to the contact piece described in claim 17, wherein the first surface is formed with a concave portion along the second side that is longer than the length of the second side. The contact according to any one of items 1 to 7 of the scope of patent application, wherein the aforementioned contact is a sintered material of silver and tungsten, tungsten carbide or graphite, or at least two of silver and tungsten, tungsten carbide and graphite A combination of sintered materials, the aforementioned metal seat system electrolytic copper or oxygen-free copper, and silver is used for the aforementioned intermediate metal. A method for manufacturing a contact, which is described in any one of items 1 to 27 in the scope of the patent application. In the method for manufacturing the contact, the first surface and the second surface are clamped to fix the The metal seat is provided with the contact point on the third surface, the contact point is pressed toward the metal seat side, and ultrasonic vibration is applied. A circuit breaker is provided with the contact piece described in any one of items 1 to 27 in the scope of patent application. A switch is provided with the contact piece described in any one of items 1 to 27 in the scope of patent application.

Images