TW202016958A - Electromagnet, electromagnetic switch, and manufacturing method of electromagnet - Google Patents

Abstract

An electromagnet (10) of this invention includes a movable iron core (20), a fixed iron core (30) disposed opposite to the movable iron core (20), and a drive coil (70) wound around the fixed iron core (30). An iron core of one of the movable iron core (20) or the fixed iron core (30) has a spacer (22) on a face opposite to the another iron, the spacer (22) is formed from a single plate of an austenitic stainless steel that is a thin plate of JIS 2B material or JIS 2D material. The spacer (22) and the iron cores (20, 30) are welded and fixed to each other by a welded portion (Y) disposed on at least one of the spacer (22) or the iron cores (20, 30) and formed in convex shape with respect to the another one of the spacer (22) or the iron cores (20, 30).

Description

Electromagnet, electromagnetic switch, and method for manufacturing electromagnet

The invention relates to an electromagnet, an electromagnetic switch, and a method for manufacturing an electromagnet.

The conventional electromagnet is the one that attracts the movable iron core to the fixed iron core by the energization of the current, and isolates the two iron cores by the release of the energization. Moreover, especially in the electromagnet driven by the current driven by the direct current or rectified by the alternating current, residual magnetization may occur in the core, and even if the power is released, the two cores may not be isolated. In order to avoid this situation, there has been disclosed an example in which a thin plate of non-magnetic metal is welded to a contact surface of at least one of a movable iron core or a fixed iron core as a residual magnetic prevention spacer (refer to, for example, Patent Document 1). (Prior art literature) (Patent literature)

Patent Literature 1: Japanese Shikai Sho 58-46412

(Problems to be solved by the invention)

In the electromagnet disclosed in Patent Document 1, when the current capacity of the circuit to be opened becomes larger, the contact of the circuit becomes larger, and the opening and closing force of the electromagnet also increases. In order to increase the opening and closing force of the electromagnet, although it is sufficient to increase the iron core, when soldering the residual magnetic prevention spacer, the iron core must be heated until the temperature of the iron core exceeds the melting point of the solder, so the iron core will change. If it is too long, the heating time becomes long and the productivity is deteriorated.

In addition, when using a low-melting-point silver solder in order to shorten the heating time, there is a problem that the price of the solder itself is high and the manufacturing cost of the product increases.

This case is to disclose the technology for solving the above-mentioned problems, and its purpose is to provide a method for manufacturing an electromagnet, an electromagnetic switch, and an electromagnet with high productivity and low cost. (Means to solve the problem)

The electromagnet disclosed in this case has: Movable iron core The fixed iron core is arranged opposite to the movable iron core; and The driving coil is wound around the aforementioned fixed core; where The iron core of one of the movable iron core or the fixed iron core is provided on the surface facing the other iron core: The spacer is made of a thin plate of Vostian iron-based stainless steel and 2B material of JIS standard or 2D material of JIS standard; and The spacer and the iron core are welded and fixed to each other by a welding portion provided on at least one of the spacer or the iron core and having a convex shape relative to the other.

Furthermore, the electromagnetic relationship disclosed in this case includes: The aforementioned electromagnet; The fixed contact is formed integrally with the aforementioned fixed iron core; and The movable contact is formed integrally with the movable core to form a movable contact, which is linked to and separated from the fixed contact by being driven by the driving of the movable core.

Furthermore, the manufacturing method of the electromagnet disclosed in this case has: In the welding step, the protrusion provided on at least one of the spacer or the iron core is in contact with the other, and electricity is applied between the electrodes in a state where the spacer and the iron core are sandwiched and pressurized by a pair of electrodes To form the aforementioned welded portion. (Effect of invention)

According to the manufacturing method of the electromagnet, electromagnetic switch, and electromagnet disclosed in this case, a plurality of protrusions are provided in the shape of a non-magnetic thin plate for preventing the magnetic residue of the fixed core and the movable core after stopping the energization of the electromagnet At least one of the spacer and the iron core can flow current to the protrusion to fuse the spacer and the iron core at a time, so it is expected that the time of the joining step of the iron core and the spacer is greatly shortened and the productivity is high.

Furthermore, since auxiliary materials for bonding such as silver solder are not required, the cost of bonding can be reduced.

Embodiment 1. Hereinafter, the manufacturing method of the electromagnet, electromagnetic switch, and electromagnet of Embodiment 1 is demonstrated using drawings.

Fig. 1 is a cross-sectional view of the electromagnetic switch 100. The electromagnetic switch 100 is composed of an electromagnet 10, a fixed contact 40, and a movable contact 50. The electromagnetic switch 100 operates the electromagnet 10 to open and close the movable contact 50 relative to the fixed contact 40.

FIG. 2 is a cross-sectional view of the electromagnet 10. The electromagnet 10 includes a movable iron core 20, fixed iron cores 30a, 30b, and drive coils 70a, 70b wound around the fixed iron cores 30a, 30b and driving the movable iron core 20 so as to be separable from the fixed iron cores 30a, 30b . In the following description, when simply referred to as the fixed iron core 30, it refers to both the fixed iron core 30a and the fixed iron core 30b, and similarly, when referred to as the drive coil 70, it refers to both the drive coil 70a and the drive coil 70b.

On the surface of the movable iron core 20 facing the fixed iron core 30, spacers 22a and 22b for preventing the magnetism remaining in the fixed iron core 30 and the movable iron core 20 from being stopped after the energization of the electromagnet 10 is stopped are installed. In the following description, when simply referred to as the spacer 22, it refers to both the spacer 22a and the spacer 22b. The fixed iron core 30 is fixed in pairs to the base plate 33 in a state where the driving coil 70 is installed.

When a current is applied to the driving coil 70, magnetic fields in opposite directions are generated in the two driving coils 70. That is, when the driving coil 70a of the fixed iron core 30a installed on the left side causes the magnetic field to be generated toward the upper side of the paper surface, the driving coil 70b of the fixed iron core 30b installed on the right side causes the magnetic field toward the lower side of the paper surface to be fixed Iron core 30b.

Furthermore, the magnetic flux generated toward the upper side of the fixed iron core 30a on the left side reaches the movable iron core 20 through the spacer 22a provided on the left side of the movable iron core 20, and the magnetic flux flows from the left to the right inside the movable iron core 20. The magnetic flux that reaches the right side of the movable iron core 20 passes through the spacer 22b to the right fixed iron core 30b, and the magnetic flux flows downward from above the right fixed iron core 30b.

Moreover, the magnetic flux reaching the lower part of the fixed iron core 30b on the right side also flows to the right side of the base plate 33 made of a magnetic material, and the magnetic flux flows from the right side of the base plate 33 toward the left side. Then, the magnetic flux reaching the left side of the base plate 33 flows to the lower part of the fixed core 30a and returns to the original position. When such a magnetic circuit is formed, the movable iron core 20 is attracted to the fixed iron core 30. Further, as shown in FIG. 1, the movable contact 50 integrally formed or held by the movable iron core 20 and the resin molded product 25 (insulator) is linked to the driving of the movable iron core 20 and fixed to the upper housing 55 ( The fixed contact 40 of the insulator) contacts, thereby closing the circuit.

Then, when the current of the driving coil 70 is shielded, the magnetic flux generated from the driving coil 70 disappears. Here, when there is no air gap between the movable iron core 20 and the fixed iron core 30, the coercive force of the materials of the movable iron core 20 and the fixed iron core 30 generates residual magnetism in the two iron cores, and is set in resin molding The rebound force of the spring 27 between the product 25 and the lower housing 34 cannot resist the attractive force generated by the magnetic properties remaining in the fixed iron core 30 and the movable iron core 20 and cannot perform the opening operation.

On the other hand, in this case, by providing a spacer 22 to prevent the residual magnetism of the non-magnetic material, the portion where the spacer 22 is present is considered to be equal to the air gap on the magnetic circuit, so it will exceed the guarantee of the two core materials The magnetic force exerts a reverse magnetic field on the two iron cores to obtain the effect that the residual magnetic flux is almost zero.

In addition, the spring 27 integrated with the movable iron core 20 pushes up the movable iron core 20 that has lost its attractive force, whereby the movable contact 50 integrated through the movable iron core 20 and the resin molded product 25 is separated from the fixed contact 40 To open the circuit.

In this way, by ON/OFF (off) of the current flowing to the drive coil 70, the movable contact 50 is opened and closed by the operation of the movable core 20, and the circuit is opened and closed.

FIG. 3 is a view of the movable iron core 20 viewed from the side of the spacer 22, and shows the state where the movable iron core 20 is welded and the spacer 22 is fixed. The spacer 22 is composed of a non-magnetic metal material, and is cut out of a plate, for example. Rectangular spacers 22 are welded and fixed to a surface facing the fixed iron core 3 of the movable iron core 20 at two ends in the longitudinal direction of the movable iron core 20, for a total of two pieces.

Although the spacer 22 is a thin plate, it is better to use a non-magnetic stainless steel material with good suitability for welding with the iron core material of the movable core. In particular, the SUS304 (STAINLESS USED STEEL), etc. The thin plate made of stainless steel is processed into a rectangle.

In addition, in the stamping process, burrs are generally generated. When the burrs are large, the burrs will be peeled off due to the impact of the opening and closing action after becoming a product, and foreign objects may be caught between the movable iron core and the fixed iron core. There may be obstacles to the action as an electromagnet. Therefore, the half-press flat pressing method is used as a punching method that does not generate burrs. In addition, for processing methods other than stamping processing, for example, laser processing can also be used.

Here, regarding the function of the spacer 22, the following points are important. That is, of course, it is a non-magnetic material that is necessary for the opening operation of the electromagnet 10 to be normal, and has a time when the movable iron core 20 collides with the fixed iron core 30 repeatedly during the closing operation of the electromagnet 10 The impact does not peel off from the movable iron core 20 to such an intensity.

As shown in FIG. 3, in order to ensure the bonding strength, the spacer 22 is welded and fixed by a welding portion Y having a circular shape with a diameter of about 3 mm to 5 mm and a convex shape toward the movable core 20 at the six parts of each piece The movable iron core 20. The six parts of the welding part Y are arranged such that the four parts are arranged near the corners of the spacer 22, and the remaining two parts are arranged at the welding of the two parts provided at both ends of the long side of the spacer 22 The midpoint of Department Y.

When the movable iron core 20 and the fixed iron core 30 perform the closing operation, the spacer 22 disposed between the movable iron core 20 and the fixed iron core 30 is subjected to the shock caused by the collision between the two. However, as described above, by arranging a plurality of welding parts Y, the impact will be dispersed in the welding parts Y of six parts, even when the electromagnetic switch 100 is used for a long time and the number of openings and closings is increased from 5 million to 10 million. It is also considered that the spacer 22 will not peel off the movable core 20 due to fatigue damage near the welded portion Y.

In addition, according to the research of the applicant, it has been confirmed that the strength of the welded portion Y, when the strength of the temporarily melted portion due to welding and the strength of the original portion are large, the stress will be concentrated in the strength due to the shock during the closing operation of the electromagnet 10 The part that changes is prone to fatigue damage.

That is, even if it is SUS304 material, the 1/2H material of the JIS (Japanese Industrial Standards) standard after hardness adjustment or the material after being hardened to a hardness above it will be confirmed to have a switching frequency of 5 million Next, there is peeling of the spacer 22 due to fatigue damage of the welded portion Y.

On the other hand, when using a 2B material of JIS standard without hardness tempering, it can be confirmed that it can withstand 5 million to 10 million opening and closing tests. That is, as long as it has a hardness equal to or less than that of 2B material, 2D material of JIS standard, or hot-rolled material, etc., the fatigue strength is high, and it is equivalent to or tempered with 1/4H tempered material of JIS standard. Materials with hardness above it have poor fatigue strength and are not suitable for this application.

On the other hand, in terms of its role as a non-magnetic material, it can be known that the SUS304 stainless steel material such as SUS304 is a cold-rolled steel that changes its crystal structure from rusty iron to hemp iron. Furthermore, the arrangement of impurities is changed from non-magnetic material to weak magnetic material.

If the spacer 22 is magnetic, the original purpose of suppressing the residual magnetization of the movable iron core 20 and the fixed iron core 30 will be halved, and the opening operation of the movable iron core 20 may be hindered. Even within this meaning, it should be avoided to use tempered materials that have increased the hardness of SUS304.

In the same way, it can also be seen that when the part of the Vostian iron-based stainless steel system is cooled and restored to a solid part due to welding, the crystal structure will change from the Vostian iron to the Matian scattered iron, and further remove impurities The configuration is changed from non-magnetic material to weak magnetic material. Therefore, the welding part is preferably as small as possible. As in the first embodiment, by dispersing the small welding part Y in a plurality of parts, the overall welding strength and the magnetic characteristics of the non-magnetic material can be taken into consideration.

After the welding of the spacer 22 is completed, the movable core 20 is rusted in this state, so the antirust plating process is performed. In the state where only the movable core 20 is provided, Zn (zinc) plating is preferable. However, since the spacer 22 made of SUS is integrated, Zn plating cannot be smoothly produced on the surface of SUS. On the other hand, it can also be seen that although a method of welding the SUS spacer 22 to the movable core 20 to which Zn plating is applied may be considered first, the welding strength is lowered due to the influence of plating.

Therefore, after the spacer 22 is welded to the movable core 20, Ni (nickel) strike plating treatment is performed, followed by Zn conversion chromate film plating treatment, thereby exerting the rust prevention function of Zn plating At the same time, plating is also applied to the surface of the spacer 22 made of SUS, so good plating can be performed.

FIG. 4A is a plan view of the spacer 22 before welding. FIG. 4B is a cross-sectional view of the main part of FIG. 4A. FIG. 4A is a diagram showing the arrangement of the protrusions 24 provided in the spacer 22 before welding. FIG. 4B is a diagram showing a cross section of the protrusion 24 and the A-A portion in the vicinity thereof. The protrusion 24 is provided at the same position as the welding portion Y. From the AA cross-sectional view showing the structure of the projection 24, the projection 24 is within the range of φD and reaches a length H, and a concave part is formed on the left part of the plate, and a convex part is formed on the right part of the plate, both of which are formed as Spherical shape with a certain radius.

This spherical shape is formed, for example, in a punching device by sandwiching a SUS304 plate with a punch having a hemispherical protrusion and a die having a hemispherical depression shape, and pushing the punch into the die. As an example of these shapes, it can be confirmed that in the range of plate thickness t of 0.3 mm to 1.5 mm, φD is preferably about 2 mm to 5 mm, and H is preferably about 0.3 mm to 1.5 mm.

Here, in the welding method of the spacer 22 and the movable core 20, first, the spacer 22 and the movable core 20 are sandwiched by a pair of electrodes in a flat plate shape, and the protrusions 24 and the movable core 20 are brought into contact with each other in a state where they are in contact with each other. Pressure. Then, a large current is energized between the electrodes via the protrusion 24, thereby concentrating heat generation on the front end of the protrusion 24, and melting the front end of the protrusion 24 and a part of the movable core 20 contacted by the protrusion 24 to fuse and join the two .

The number of power-on times can be completed at once regardless of the number of protrusions 24. At this time, although the pressing force varies depending on the plate thickness, each protrusion 24 is in the range of 0.2 kN to 2 kN. In addition, the energizing current is 2kA to 5kA per protrusion. Furthermore, the power-on time is in the range of 15msec to 60msec.

In addition, when a large current is circulated by the design that the distance between the protrusions 24 is short, it can be confirmed that the molten parts are pulled and moved by Lorentz force, resulting in a phenomenon of long protrusion-shaped parts. This part has nothing to do with the welding strength, and in the worst case, it will fall off and become a foreign body due to the shock of opening and closing. In the configuration of the first embodiment, for example, when the foreign object is sandwiched between the spacer 22 and the fixed iron core 30, there will be an opening and closing operation of the electromagnet 10 due to a decrease in the attractive force between the iron cores at the time of pole closing, etc. Causes obstacles. Therefore, in order not to produce the above-mentioned long protrusion-shaped portion, the distance between the protrusions 24 is preferably separated by 10 mm or more in advance.

In addition, in general, although the resistance welding method in which welding is performed without providing protrusions is mostly used, it is necessary to use a small electrode with a diameter of about several mm to sandwich the welding part for each part to perform welding. When it is applied to the case where a plurality of welding parts Y are provided as in this case, first, the positioning of the welding parts is performed, and then the steps of clamping and energizing the electrodes multiple times are repeated to reach the number of welding parts. As a result, all the welding takes time, and in the welding of the welding part after the second part, the current will flow back to the welding part before welding, so that the current of the part to be welded is reduced and the welding may be insufficient. .

On the other hand, according to the welding method described in the first embodiment, the spacer 22 and the movable core 20 are sandwiched and energized by a pair of plate-like electrodes larger than the spacer 22, and therefore no positioning of the electrodes is required. In addition, since a method is adopted in which the protrusion 24 is in contact with the movable iron core 20 and a large current is energized between the movable iron core 20 and the body of the spacer 22 through the protrusion 24, it can be energized at a time A plurality of welded portions Y are generated, which is more advantageous in terms of productivity.

In addition, in the first embodiment, a spherical shape is exemplified as the shape of the protrusion 24, but it is not limited thereto, and may be, for example, a conical shape. In addition, although it is shown that the shape of the back side of the protrusion 24 and the shape of the front side of the protrusion 24 are spherical, they do not necessarily have to be the same shape, and there is no problem even if the combination is, for example, a spherical surface on the back and a conical shape on the back.

Regarding the point of attention when forming the protrusions 24 in the spacer 22, it is preferable to make the shape and height of the plurality of protrusions 24 coincide. If the heights of the protrusions 24 do not match, although some protrusions 24 are in contact with the movable core 20 but other protrusions 24 are not in contact, there is a possibility that the uncontacted protrusions 24 cannot be welded.

Although there are several types of power supplies for welding, especially when storing charges in a capacitor and discharging the charges, a capacitor-type power supply for constant current control by inverter control is preferable. According to this power supply, a large current can be circulated in a short time, and the energy required for welding can be set to the minimum required, so that the generation of sputter-like foreign objects and the explosion during welding can be suppressed. Stable welding.

In addition, in the first embodiment, although the example in which the protrusion 24 is provided on the side of the spacer 22 is shown, it is not necessarily required to be provided on the spacer 22, but the protrusion may be provided on the side of the movable core 20 in advance. Even in this case, the welding sequence will not change as described above.

According to the manufacturing method of the electromagnet 10, the electromagnetic switch 100, and the electromagnet of the first embodiment, the plurality of protrusions 24 are provided to prevent the magnetism remaining in the fixed iron core 30 and the movable iron core 20 after stopping the energization of the electromagnet 10 The non-magnetic thin plate-shaped spacer 22 can weld the protrusions 24 to the movable core 20 at a time, so the time of the joining step is expected to be greatly shortened and the productivity is high.

In addition, since auxiliary materials for bonding such as silver solder are not required, the cost of bonding can be reduced.

Embodiment 2. Hereinafter, the manufacturing method of the electromagnet, electromagnetic switch, and electromagnet of Embodiment 2 will be described focusing on the parts different from Embodiment 1 using drawings. FIG. 5A is a view of the fixed iron core 230 viewed from the spacer 232 side. Fig. 5B is a side view of the fixed iron core 230.

In the first embodiment, the spacer 22 is welded to the movable core 20, but in the present embodiment, the spacer 232 is welded to the fixed core 230. In this manner, even if the spacer 232 is welded and fixed to the fixed iron core 230 side instead of the movable iron core 20, of course, the same effect as the first embodiment can be exerted. In addition, as shown in FIGS. 5A and 5B, when the spacer 232 is welded to the iron core (whether movable or fixed) via the protrusion, a convex shape remains in the welded portion Y and it cannot be avoided that the minute gap d remains in Between the spacer 232 and the iron core. This is also the same as the welding part Y of the first embodiment.

In the applicant's experiment, it is considered that the gap d also tends to become larger as the thickness of the spacer 232 becomes thicker. It was also confirmed that when the gap d becomes larger, the spacer 232 tends to peel off easily in the repeated opening and closing test of the electromagnet 10. Therefore, it is preferable to reduce the gap d as much as possible, more preferably 0.2 mm or less, and particularly preferably 0.1 mm or less.

In the second embodiment, the number of welded parts Y is five. For the spacer 232 that is rectangular and the difference between the long side and the short side is relatively small, it is effective to dispose the welding part Y on the four corners and the diagonal of the spacer 232. Furthermore, for those with a small difference between the long side and the short side, the welded portion Y may be provided only at four parts of the four corners.

According to the manufacturing method of the electromagnet 10, the electromagnetic switch 100, and the electromagnet of the second embodiment, the plurality of protrusions 24 are provided to prevent the magnetism remaining in the fixed iron core 230 and the movable iron core 20 after stopping the energization of the electromagnet 10 The non-magnetic thin plate-shaped spacer 232 can weld the protrusions 24 to the fixed iron core 230 at a time, so the time of the joining step is expected to be greatly shortened and the productivity is high.

8A and 8B are two side views showing a modification of the movable core. FIG. 8A is a view of the fixed iron core 230B viewed from the side of the welding spacer, and FIG. 8B is a side view of the fixed iron core 230B.

So far, although the example in which the protrusion 24 is provided on the spacer is shown, the protrusion 24B may be provided on the fixed iron core 230B side as shown in FIGS. 8A and 8B. In general, the spacer is a thin plate, so it is easier to perform protrusion processing than the core. However, during welding, when the melting state on the core side is not good, etc., it may be advantageous to provide a protrusion on the core side. Even if protrusions are provided on the core side, of course, welding can also be performed by adjusting welding conditions.

9A, 9B, and 9C are diagrams showing examples of arrangement of other protrusions. FIG. 9A is a top view of the spacer 232C. FIG. 9C is a view of the fixed iron core 230C viewed from the side of the welding spacer 232C. FIG. 9B is a view showing a state where the spacer 232C is welded to the fixed core 230C. As shown in FIGS. 9A, 9B, and 9C, even if the protrusions 24C and 24B are provided in both the spacer 232C and the fixed core 230C, the same welding can be performed.

In this example, three protrusions 24C1 of the total six protrusions are provided in the spacer 232C, and the remaining three protrusions 24C2 are arranged at the positions of the vertices of the triangles on the fixed iron core 230C side. After welding, all The welding part Y has a rectangular configuration. In addition, by changing the heights of the protrusions 24C1 and 24C2, it becomes a three-point support for the higher height during installation, and it is expected that the stability of the installation state of the spacer 232C before welding is improved.

Embodiment 3. Hereinafter, the manufacturing method of the electromagnet, electromagnetic switch, and electromagnet of Embodiment 3 will be described focusing on the parts different from Embodiments 1 and 2 using drawings. Fig. 6 is a view of the fixed iron core 330 viewed from the side of the spacer 332. The outer peripheral shape of the contact surface of the fixed iron core 330 is circular, and in accordance with the shape, the spacer 332 is configured to have a circle with a center point O which is the same as the outer periphery of the fixed iron core 330 and a small circle.

In addition, the welded portion Y is provided at three positions of the vertices of the regular triangle centered on the center point O. If the number of welding parts Y=the number of protrusions before welding is set to three parts, even when the height of the protrusions 24 is uneven, the contact between the fixed iron core 330 and the spacer 332 is stable, so The contact resistance of each welding part Y is also stable, and stable energization and welding can be performed. In addition, even if the outer peripheral shape of the contact surface of the fixed iron core is quadrangular and the shape of the spacer is circular, the same effect can be exerted.

Embodiment 4. Hereinafter, the method of manufacturing the electromagnet, electromagnetic switch, and electromagnet of Embodiment 4 will be described focusing on the portions different from Embodiments 1 to 3 using drawings. Fig. 7 is a view of the fixed iron core 430 viewed from the side of the spacer 432. The outer peripheral shape of the contact surface of the fixed iron core 430 is rectangular, and the long side is far longer than the short side. In addition, the welded portions Y along the edges of the respective long sides are provided at three locations. In addition, another welding part Y is provided at the intersection of the diagonals of the quadrangle, which is the welding part Y of the two parts adjacent to the edge of one long side and the other side The welding part Y of the two parts of the welding part Y of the edge part and the welding part Y of the two parts located on the same side in the longitudinal direction is the vertex. Therefore, in FIG. 7, the welding part Y arranged at the intersection of the diagonal lines has two parts, and has a total of eight parts of the welding part Y.

According to this configuration, even when the rectangular spacer 432 having a relatively large length and width is used, the spacer 432 can be reliably fixed without impairing the welding strength of the fixed iron core 430 and the spacer 432.

Embodiment 5. Hereinafter, the manufacturing method of the electromagnet of Embodiment 5 is demonstrated using drawings. FIG. 10 is a diagram showing a method of positioning the movable core 20 and the spacer 22 made of SUS before welding by using the positioning jig 500. FIG. FIG. 11 is a flowchart showing the steps of welding the spacer 22 and the movable core 20.

First, a positioning jig 500 having an opening 22k formed through a portion where the spacer 22 is provided is placed on the welding surface 20s of the movable core 20 (step S001: positioning jig installation step). Next, two spacers 22 are fitted and arranged so as to be along the edge of the opening 22k. (Step S002: spacer configuration step). When the spacer is configured in the above manner, the position of the spacer 22 relative to the movable core 20 can be accurately positioned.

FIG. 12 is a diagram showing the size relationship between the positioning jig 500 and the spacer 22, and shows the state after the positioning is completed and before welding. Although the spacer 600 was pressurized by the electrode 600, it was not energized. FIG. 13 is a diagram showing a state where the current for welding (step S003: welding step) is completed and the welding is completed, but the electrode 600 continues to be pressurized.

In FIGS. 12 and 13, when the thickness of the spacer 22 other than the conical protrusion 24B is set to hs, the height of the protrusion 24B provided in the spacer 22 before welding is set to ht, and When the thickness of the portion of the positioning jig 500 that contacts the spacer 22 is set to hj, by setting the size relationship of the three as ht>hj≦hs, the positioning jig 500 can be left in contact with the spacer 22 before welding (Hj-ht>0), at the same time, it can ensure the gap (hs+d-hj≧0) that the positioning jig 500 does not contact the electrode 600 after being welded, or will not be pressed even if it contacts. Thereby, the spacer 22 and the movable iron core 20 can be welded while maintaining the positioning jig 500 (step S003: welding step), and the accuracy of the welding position of the two can be improved.

Fig. 14 is a diagram showing another example of the positioning jig. The positioning jig 500B is a part that includes a part of the opening 22k described above and cuts off both ends in the longitudinal direction of the positioning jig 500 to open. While maintaining the positioning accuracy of the spacer 22, the workability of the spacer 22 can be improved.

In addition, as described above, protrusions may be provided on the fixed iron core side. Even in the case where protrusions are provided on both sides, the same effect can be obtained as long as the height of the protrusions is ht.

The positioning jigs 500 and 500B preferably use an insulator, and can be applied to resins such as glass epoxy, monomer cast nylon, or materials such as ceramics. In this embodiment, although the spacer is exemplified as a rectangular shape, of course, other shapes such as the above-mentioned circular shape can also be applied.

In addition, in the above embodiments, although SUS304 is exemplified as the material of the spacers 22, 232, 332, and 432, other Vostian iron-based stainless steel materials, for example, as long as they are SUS300-based and are not hardened and tempered Materials can of course have the same effect.

Furthermore, regarding the phenomenon of magnetization of Vostian iron-based stainless steel by processing, it can be known that the magnetization can be suppressed on the material surface by increasing the nickel content. Although the price of the material will increase, as long as the nickel content is selected Many SUS305, SUS316, etc. can greatly reduce the magnetization caused by processing.

In addition, although the material of the iron core is exemplified as an integral shape, even if a magnetic steel sheet such as an electromagnetic steel sheet or a cold rolled rolled steel sheet is laminated and integrated, it is of course possible to exert the same effect.

Although various exemplary embodiments and examples are described in this case, the various features, aspects, and functions described in one or more embodiments are not limited to be applicable to a specific embodiment, but can also be used by It can be applied to the embodiments individually or in various combinations. Therefore, within the technical scope disclosed in this case, countless modifications that are not illustrated can be conceived. For example, there are cases where at least one component is deformed, at least one component is added or omitted, and at least one component is extracted and combined with components of other embodiments.

10: Electromagnet 20: movable iron core 22, 22a, 22b, 232, 232C, 332, 432: spacer 20s: welding surface 22k: opening 24, 24B, 24C1, 24C2: protrusion 25: Resin molded product 27: Spring 30, 30a, 30b, 230, 230B, 330, 430: fixed iron core 33: base plate 34: Lower shell 40: fixed contact 50: movable contact 55: upper shell 70, 70a, 70b: drive coil 100: electromagnetic switch 500, 500B: positioning fixture 600: electrode d: clearance H: length hs, hj: thickness ht: height O: center point Y: Welding Department t: plate thickness

Fig. 1 is a cross-sectional view of the electromagnetic switch of the first embodiment. Fig. 2 is a cross-sectional view of the electromagnet of the first embodiment. Fig. 3 is a view of the movable iron core of the first embodiment viewed from the side of the spacer. Fig. 4 is a plan view of a spacer before welding in Embodiment 1 and a cross-sectional view of its main parts. Fig. 5 is a two-side view of the fixed iron core in the second embodiment. Fig. 6 is a view of the fixed iron core of the third embodiment viewed from the spacer side. Fig. 7 is a view of the fixed iron core of the fourth embodiment viewed from the side of the spacer. Fig. 8 is a two-side view showing a modification of the movable core in the second embodiment. Fig. 9 is a diagram showing an arrangement example of other protrusions in the second embodiment. Fig. 10 is a diagram showing the method of positioning the movable core and the spacer before welding by using the positioning jig of the fifth embodiment. Fig. 11 is a flowchart showing the steps of welding the spacer and the movable core in the fifth embodiment. FIG. 12 is a diagram showing the size relationship between the positioning clip and the spacer in the fifth embodiment, and is a diagram showing the state after positioning and before welding. FIG. 13 is a diagram showing a state in which the energization for welding in Embodiment 5 is completed and the welding is completed, but the electrode is still under pressure. Fig. 14 is a diagram showing another example of the positioning jig of the fifth embodiment.

10: Electromagnet

20: movable iron core

22a, 22b: spacer

25: Resin molded product

27: Spring

30a, 30b: fixed iron core

33: base plate

34: Lower shell

40: fixed contact

50: movable contact

55: upper shell

70a, 70b: drive coil

100: electromagnetic switch

Claims (10)

An electromagnet with: Movable iron core The fixed iron core is arranged opposite to the movable iron core; and The driving coil is wound around the aforementioned fixed core; where The iron core of one of the movable iron core or the fixed iron core is provided on the surface facing the other iron core: The spacer is made of a thin plate of Vostian iron-based stainless steel and 2B material of JIS standard or 2D material of JIS standard; and The spacer and the iron core are welded and fixed to each other by a welding portion provided on at least one of the spacer or the iron core and having a convex shape relative to the other. The electromagnet as described in item 1 of the scope of the patent application, wherein the spacer is rectangular, and the welding part is arranged at two points of the middle of the four corners of the rectangle and the long side of the rectangle Six parts in total. The electromagnet as described in item 1 of the scope of the patent application, wherein the spacer is circular, and the welded portion is provided at three parts of the apex of a triangle having the same center point as the center point of the spacer The location. The electromagnet as described in item 1 of the scope of the patent application, wherein the spacer is rectangular, and includes: two welded portions adjacent to the edge of one of the long sides of the spacer; The other long side edge part, and the welding part of the two parts located on the same side in the longitudinal direction as the welding part of the two parts; and the pair of quadrilaterals arranged with the welding parts of the four parts as vertices The welding part of the other part on the intersection of the corner lines. An electromagnetic switch with: The electromagnet as described in any one of items 1 to 4 of the patent application scope; The fixed contact is insulated and connected to the aforementioned fixed iron core; and The movable contact is interlocked and separated from the fixed contact in conjunction with the driving of the movable iron core, and is insulated and connected to the movable iron core. A method for manufacturing an electromagnet is a method for manufacturing an electromagnet according to any one of claims 1 to 4 of the patent application. The manufacturing method includes: a welding step, which is provided on the spacer or the core At least one of the protrusions is in contact with the other, and electricity is applied between the electrodes with the pair of electrodes sandwiching the spacer and the iron core and pressurized to form the welded portion. The method of manufacturing an electromagnet as described in item 6 of the patent application scope includes a spacer arrangement step of positioning the spacer on the welding surface of the iron core with a positioning jig. The method of manufacturing an electromagnet as described in item 7 of the patent application range, wherein the positioning jig has an opening formed through a portion where the spacer is provided. The method for manufacturing an electromagnet as described in item 8 of the patent application range, wherein when the thickness of the spacer other than the protrusion is set to hs, the height of the protrusion is set to ht, and the position of the positioning jig When the thickness is set to hj, ht>hj≦hs; and The aforementioned welding step is performed in a state where the aforementioned positioning jig is provided. The method of manufacturing an electromagnet as described in any one of claims 6 to 9, wherein the protrusions are respectively arranged in the spacer and the iron core, and the three protrusions They are arranged at the positions of the vertices of the triangle.

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