Method for riveting fastening components, arc extinguishing device obtained by the riveting method, and circuit breaker using the arc extinguishing device

Abstract

In a riveting process, a portion pressed by a riveting punch expands in a manner to cover a fastened member, enabling the riveting holding force to be made firm. A riveting method of a fastened member enables a protrusion protruding from a first end surface of a plate-shaped fastened member to be made to penetrate a hole provided in a fastened member, and enables the protrusion to plastically flow. In the riveting method of the fastened member, a riveting punch has two pressing portions that press both end portions on a second end surface of the protrusion in directions of the fastened member, respectively, and an avoiding portion that is a space provided in opposition to the protrusion between the two pressing portions. The riveting method of the fastened member has a first process of arranging the protrusion in a state of penetrating the hole provided in the fastened member, and a second process of pressing the both end portions by the two pressing portions to form a flattened portion that is obtained by plastically flowing the both end portions in a manner to extend from the hole and cover the fastened member.

Description

Technical Field

[0001] This invention relates to a riveting method for fastening components, an arc-suppressing device obtained by the method, and a circuit breaker. More specifically, this invention enables fastening achieved through riveting to become more robust. Background Technology

[0002] In existing riveting methods, it is known to rivet fasteners in which a protrusion protruding from the first end face of a plate-shaped fastener passes through a hole provided in the fastened fastener, allowing the protrusion to flow plastically (for example, see Patent Document 1).

[0003] Patent Document 1: Japanese Patent Publication No. 56-097876

[0004] However, this method has the following problem: the part pressed by the riveting punch only expands in one direction, and the riveting holding force is weak. Summary of the Invention

[0005] The present invention was proposed to solve the above-mentioned problems, and its purpose is to make the riveting holding force more secure.

[0006] The riveting method of the present invention allows a protrusion protruding from the end face (i.e., the first end face) of a plate-shaped fastening member to pass through a hole provided in the fastened member, causing the protrusion to plastically flow. In this riveting method, the riveting punch has: two pressing parts that press the two ends of the end face (i.e., the second end face) of the protrusion toward the fastened member; and a clearance part that is a space provided between the two pressing parts and opposite to the protrusion. The riveting method of the fastening member has: a first step of arranging the protrusion so that it passes through the hole provided in the fastened member; and a second step of pressing the two ends by the two pressing parts to form a flattened part, which is obtained by plastically flowing the two ends by extending from the hole and covering the fastened member.

[0007] The effects of the invention

[0008] The riveting method involved in this invention can make the riveting holding force more secure. Attached Figure Description

[0009] Figure 1 These are top views (a) and front views (b) illustrating the riveting method in Embodiment 1.

[0010] Figure 2 These are the top view (a) and front view (b) after riveting in Implementation Method 1.

[0011] Figure 3 These are front views (a) and (b) of the riveting punch in Embodiment 1.

[0012] Figure 4 These are front views (a) and (b) showing the riveting punch and fastening components during the riveting process in Embodiment 1.

[0013] Figure 5 This is a front view showing the change of the protrusion of the through hole after the riveting process in Embodiment 1.

[0014] Figure 6 This is a perspective view of an arc-extinguishing device shown as an application example of the riveting method in Embodiment 1.

[0015] Figure 7 This is a perspective view of the arc-extinguishing device after riveting in Embodiment 1.

[0016] Figure 8 These are perspective views (a) of a single arc-extinguishing grid sheet and perspective views (b) of a combination of multiple grid sheets in Implementation Method 1.

[0017] Figure 9 These are the left side view (a), front view (b), and right side view (c) of the arc-extinguishing device after riveting in Embodiment 1.

[0018] Figure 10 This is a perspective view showing the state after the cover of the circuit breaker using the arc suppression device in Embodiment 1 has been removed.

[0019] Figure 11 These are top views (a) and front views (b) showing a modified example of the protrusion in Embodiment 1.

[0020] Figure 12 These are top views (a) and front views (b) showing a modified example of the protrusion after riveting in Embodiment 1. Detailed Implementation

[0021] Implementation method 1.

[0022] The circuit breaker used in this embodiment will be described. Figure 1 These are top views (a) and front views (b) illustrating the riveting method in Embodiment 1. Figure 2 These are the top view (a) and front view (b) after riveting in Implementation Method 1. Figure 3 These are front views (a) and (b) of the riveting punch in Embodiment 1. Figure 4 These are front views (a) and (b) showing the riveting punch and fastening components during the riveting process in Embodiment 1. Figure 5 This is a front view showing the change of the protrusion of the through hole after the riveting process in Embodiment 1. Figure 6This is a perspective view of an arc-extinguishing device shown as an application example of the riveting method in Embodiment 1.

[0023] Figure 7 This is a perspective view of the arc-extinguishing device after riveting in Embodiment 1. Figure 8 These are perspective views (a) of a single arc-extinguishing grid sheet and perspective views (b) of a combination of multiple grid sheets in Implementation Method 1. Figure 9 These are the left side view (a), front view (b), and right side view (c) of the arc-extinguishing device after riveting in Embodiment 1. Figure 10 This is a perspective view of the circuit breaker using an arc suppression device in Embodiment 1. Figure 11 These are top views (a) and front views (b) showing a modified example of the protrusion in Embodiment 1. Figure 12 These are top views (a) and front views (b) showing a modified example of the protrusion after riveting in Embodiment 1.

[0024] Here, the structures of the fastening components and riveting punches used in Embodiment 1 will be described.

[0025] For fastening component 1, a fastening component with a suitable material can be selected from various fastening components widely used in this technical field. For example, it can be formed from carbon steel. Figure 1 As shown in (a), the fastening member 1 is a plate-shaped component with thickness in the X-axis direction, and has a protrusion 1a protruding from the first end face 1d. The protrusion 1a is configured to pass through the hole 2a provided in the fastened member 2, which will be described later. Based on this, as Figure 1 As shown in (b), a second end face 1a1 is provided on the upper side of the Z-axis paper surface of the protrusion 1a, and two end faces 1a2 are provided on the left and right sides of the Y-axis paper surface of the second end face 1a1, respectively.

[0026] The fastened component 2 can be selected in the same way as the fastening component 1, with a suitable shape and material. For example, it can be formed of an insulating material. In addition, the fastened component 2 has a hole 2a through which the protrusion 1a of the fastening component 1 can pass.

[0027] like Figure 2 As shown in (a), it has a flattened portion 1b, which expands in the X-axis and Y-axis directions after pressure is applied to the protrusion 1a of the fastening member 1 in the direction of the fastened member 2. For example, if it is Figure 2 (a) On the right end, the flattened part 1b extends in three directions: the thickness direction of the fastening member 1, i.e., the X-axis paper direction up and down (arrow L and arrow N directions) and the Y-axis paper direction to the right (arrow M direction) which is perpendicular to the thickness direction of the fastening member 1 and parallel to the second end face 1a1.

[0028] The flattened portion 1b is wider than the hole 2a of the fastened component 2, thus preventing the fastening component 1 and the fastened component 2 from separating after riveting. Here, the direction of arrow M can be referred to as the first direction, the direction of arrow L as the second direction, and the direction of arrow N as the third direction. In addition to the three directions, it is also possible to extend the direction, for example, to the middle direction between the first and second directions.

[0029] exist Figure 2 In (b), the gap 3 is shown as being enlarged to separate the fastening member 1 and the fastened member 2. However, in reality, the gap 3 is only generated due to the difference in flatness between the fastening member 1 and the fastened member 2, and the gap 3 is very small. In addition, the unpressurized portion is adjacent to the flattened portion 1b in the Y-axis direction to form the remaining portion 1c. Therefore, the shape after riveting the protrusion 1a is the flattened portion 1b and the remaining portion 1c.

[0030] Furthermore, there is a height difference between the upper Z-axis side of the flattened portion 1b and the Z-axis direction of the fastened component 2. That is, during the riveting process, the riveting punch 4, described later, does not contact the fastened component 2. If this riveting process is performed, the flattened portion 1b will expand in both the X-axis and Y-axis directions on the paper surface. Therefore, even without bringing the riveting punch 4 close enough to contact the fastened component 2, the flattened portion 1b can be expanded, making the riveting secure.

[0031] Figure 3 The riveting punch 4 shown is formed from a material with excellent strength and rigidity, such as metal. Additionally, as... Figure 3 As shown in (a), the riveting punch 4 has: two pressing parts 4a, which are arranged on the left and right sides of the X-axis paper plane, and the two ends 1a2 of the protrusion 1a ( Figure 1 (b) is pressurized; and a clearance portion 4b is located between the two pressurizing portions 4a so as not to interfere with the protrusion 1a. Figure 1 (b) The contact method with the protrusion 1a ( Figure 1 The space is arranged opposite to each other (b). The clearance part 4b is formed by the opening 4b1 and the inverted U-shaped bottom 4b2. The two pressure parts 4a are located on the lower side of the Z-axis of the paper surface ( Figure 1 The angle of (b) the fastened part 2 direction is defined as the pressure part angle 4c. Here, the pressure part angle 4c, that is, the angle of the fastened part 2 side of the two pressure parts 4a, is set to 180 degrees or more.

[0032] Furthermore, the angle constituting the clearance portion 4b, namely the clearance portion angle 4d, is set such that the opening portion 4b1 side is fastened to the fastening member 2 ( Figure 1 The angle of the opening 4b1 side is larger than that of the bottom 4b2 side. That is, the angle of the clearance part 4b is larger on the opening 4b1 side than on the bottom 4b2 side.

[0033] In addition, not limited to Figure 3 The shape shown in (a) can also be Figure 3 The shape shown in (b). Additionally, even in... Figure 3 In case (b), the angle 4c of the pressurizing part is also set to 180 degrees or more, and the angle 4d of the avoidance part is set such that the side of the opening 4b1 is greater than the side of the bottom 4b2.

[0034] like Figure 4 As shown in (a) and (b), the pressing part 4a of the riveting punch 4 contacts the protrusion 1a. As described above, by adjusting the angle 4c of the pressing part ( Figure 3 The angle is set to 180 degrees or more, so that the two ends 1a2 after being pressed by the pressure part 4a will not expand towards the center direction of the riveting punch 4, i.e., the avoidance part 4b, when viewed from the pressure part 4a. The flattened part 1b can easily expand in the direction of arrow M (Y-axis direction). Because it can easily expand, the riveting can be made more secure.

[0035] like Figure 5 As shown, pressure is applied to the flattened portion 1b through the riveting process, thereby causing the protrusion 1a, which passes through the hole 2a of the fastened component 2 after the riveting process, to expand in the direction of arrow P (Y-axis direction). By expanding, the hole 2a and the protrusion 1a of the fastened component 2 come into contact, making the riveting holding force more secure.

[0036] Furthermore, after the riveting process, the riveting punch 4 moves upward on the paper in the Z direction. At this time, the clearance angle 4d is set such that the opening 4b1 side is larger than the bottom 4b2 side, so the remaining part 1c will not hook the riveting punch 4, and the riveting punch 4 can be pulled out.

[0037] like Figure 6 As shown, this riveting can also be applied to the arc-extinguishing device 5 of the circuit breaker 100. The arc-extinguishing device 5 is a device for extinguishing the arc generated when the circuit breaker 100 is disconnected due to overcurrent or short-circuit current. The arc-extinguishing device 5 consists of an arc-extinguishing grid 6 formed of metal and an arc-extinguishing grid support 7 formed of insulating material. Furthermore, in Figure 6 In the process, the arc-extinguishing grid plate 6 can be configured with multiple plates or with a single plate.

[0038] like Figure 7 As shown, after the arc-extinguishing grid protrusion 6a is riveted, an arc-extinguishing grid flattened portion 6b is formed in the same manner as the protrusion 1a of the fastening member 1. The arc-extinguishing grid protrusion 6a can... Figure 6 The arrow on the paper extends in the direction of the arc-extinguishing grid. That is, the flattened portion 6b of the arc-extinguishing grid is related to... Figure 2 The flattened part 1b has the same shape.

[0039] The arc-extinguishing device 5 has multiple arc-extinguishing grid protrusions 6a on both sides of the Z-axis paper plane in the left-right direction. However, by simply applying pressure to both sides with the riveting punch 4, the flattened arc-extinguishing grid portions 6b on both sides can be formed simultaneously. Therefore, the arc-extinguishing device 5 can be provided at a low cost.

[0040] like Figure 8 As shown, in the arc-quenching grid 6 Figure 8 Arc-extinguishing grid protrusions 6a are provided at the left and right ends of the paper along the Z-axis direction. Relative to a single arc-extinguishing grid 6, the arc-extinguishing grid protrusions 6a are provided at one end along the Z-axis and two at the other end, for a total of three locations. By providing the arc-extinguishing grid protrusions 6a at three locations, arc-extinguishing grid protrusions 6a can be prevented from... Figure 8 A rotational offset occurs in the direction of arrow R in (a).

[0041] In addition, such as Figure 8 As shown in (b), when multiple arc-extinguishing grid plates 6 are overlapped, the positions of the arc-extinguishing grid plate protrusions 6a on the left side of the Z-axis paper plane are alternately changed from the top to the bottom of the X-axis paper plane, with two protrusions and one protrusion at each location. By arranging them alternately as described above, even if the flattened portions 6b of the arc-extinguishing grid plates expand in the vertical direction of the X-axis after riveting, the flattened portions 6b of the arc-extinguishing grid plates will not interfere with each other. Therefore, multiple arc-extinguishing grid plates 6 can be arranged in a small space. Furthermore, when multiple arc-extinguishing grid plates 6 are overlapped, the arc-extinguishing grid plates 6 can be made to contact each other or have gaps.

[0042] like Figure 9 As shown in (a) to (c), the arc-extinguishing device 5 has multiple arc-extinguishing grid plates 6. Figure 9 As shown in (a), the arc-extinguishing grid protrusions 6a are arranged alternately in two locations, one location, two locations, one location, two locations, one location, two locations, and so on, from top to bottom of the paper. By arranging them as described above, the limited space of the arc-extinguishing grid support 7 can be used effectively.

[0043] like Figure 10 As shown, the arc-extinguishing device 5 manufactured by this riveting method is used in a known circuit breaker 100 for opening, closing, and breaking circuits. The arc-extinguishing device 5 has arc-extinguishing grid protrusions 6a on both sides, but since they can be processed simultaneously, the arc-extinguishing device 5 can be manufactured at a low cost, and the circuit breaker 100 can also be provided to users at a low cost.

[0044] Furthermore, the arc extinguishing device 5 is not limited to the circuit breaker 100, but can also be applied to electromagnetic switches or vacuum circuit breakers.

[0045] In addition, Figure 1 The central convex part 1a is rectangular, but as a variation, such as Figure 11As shown, the protrusion 1a can also be elliptical. As mentioned above, the protrusion 1a can be applied in various shapes such as rectangle, square, ellipse, and circle.

[0046] like Figure 12 As shown, for Figure 11 The elliptical protrusion 1a is riveted together to form the flattened portion 1b. Figure 2 Similarly, the flattened portion 1b extends in three directions: arrow L, arrow M, and arrow N. Furthermore, the protrusion 1a that penetrates the hole 2a also... Figure 2 Similarly, it extends in the direction of arrow P. Therefore, it is possible to make the riveting holding force strong, just like when the protrusion 1a is rectangular.

[0047] According to Embodiment 1, the riveting method of the fastening member 1 involves a protrusion 1a protruding from the end face 1d of the plate-shaped fastening member 1, i.e., the first end face 1d, passing through a hole provided in the fastened member 2, causing the protrusion 1a to plastically flow. In this riveting method of the fastening member 1, the riveting punch 4 has: two pressing parts 4a, which press the two ends 1a2 on the end face 1a1 of the protrusion 1a, i.e., the second end face 1a1, towards the fastened member 2; and a clearance part 4b, which is located between the two pressing parts. The riveting method includes: a first step in which the protrusion 1a is arranged so that it passes through the hole in the fastened member 2; and a second step in which the two ends 1a2 are pressed by the two pressing parts 4a to form a flattened part 1b, which is obtained by plastically flowing the two ends 1a2 in a manner that extends from the hole and covers the fastened member 2, thereby making the riveting holding force strong.

[0048] In addition, the riveting punch 4 does not contact the fastened part 2 during the riveting process. Therefore, in addition to the effect of making the riveting holding force more secure as described above, it can also prevent the riveting punch 4 from contacting the fastened part 2 due to position fluctuations, thus preventing damage to the fastened part 2.

[0049] Furthermore, as shown in Embodiment 1, the protrusion 1a provided in the fastening member 1 passes through the hole 2a provided in the plate-shaped fastened member 2, and flattened portions 1b are provided at both ends 1a2 of the protrusion 1a. If the above riveting method is used, it can be applied not only to the arc extinguishing device 5 or the circuit breaker 100, but also to household appliances or automotive parts, etc.

[0050] The structure shown in the above embodiments represents one example of the content of this invention. These embodiments can be combined with other known technologies. Parts of the structure of the embodiments can be omitted or modified without departing from the spirit of this invention.

[0051] Explanation of the label

[0052] 1 Fastening component, 1a Protrusion, 1a1 Second end face, 1a2 Both ends, 1b Flattened part, 1c Remaining part, 1d First end face, 2 Fastened part, 2a Hole, 3 Clearance 4. Riveting punch, 4a. Pressing part, 4b. Clearance part, 4b1. Opening part, 4b2. Bottom. 4c Angle of the pressurizing part, 4d Angle of the clearance part, 5 Arc extinguishing device, 6 Arc extinguishing grid plate. 6a. Protrusion of the arc-extinguishing grid, 6b. Flattened part of the arc-extinguishing grid, 7. Support for the arc-extinguishing grid. 100 Circuit breaker.

Claims

1. A method for riveting fastening components, wherein a protrusion extending from the end face, i.e., a first end face, of a plate-shaped fastening component passes through a hole provided in the fastened component, allowing the protrusion to plastically flow. In the riveting method of this fastening component, The riveting punch has the following features: Two pressure-applying parts apply pressure to both ends of the second end face of the protrusion towards the fastened component; and The clearance portion is a space disposed between the two pressurizing portions and opposite to the protrusion. The riveting method for this fastening component has the following characteristics: The first step involves arranging the protrusion so that it passes through the hole in the fastened component; and In the second step, the two ends are pressurized by the two pressurizing parts to form flattened parts. The flattened parts are obtained by plastically flowing the two ends in a manner that extends from the hole and covers the fastened component.

2. The riveting method for fastening components according to claim 1, characterized in that, The flattened portion plastically flows in a direction that includes either the thickness direction of the plate-shaped fastening member or the direction of the two pressurized portions when viewed from the clearance portion.

3. An arc-extinguishing device, which is fastened by the riveting method described in claim 1 or 2. The fastening component is an arc-extinguishing grid plate. The fastened component is an arc-extinguishing grid support.

4. The arc-extinguishing device according to claim 3, characterized in that, The arc-extinguishing grid has a protrusion at one end and multiple protrusions at the other end, and the arc-extinguishing grid is stacked on the arc-extinguishing grid support in a manner in which the one protrusion and the multiple protrusions are alternately arranged.

5. A circuit breaker that uses the arc-extinguishing device described in claim 3.

6. A circuit breaker that uses the arc extinguishing device described in claim 4.

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