JPH11333576A - Method for laser beam machining and electromagnetic relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a laser beam irradiation structure, and to improve the quality of laser beam machining by preventing a resin formed part from being burnt caused by at least either reflected laser beam or plume which is generated by the irradiation of the laser beam to a working part. SOLUTION: A resin formed part 2 is projected from the surface of, and near a working part 1. When the surface of the working part 1 is irradiated by a laser beam 4, reflected laser beam 6 and plume 5 are generated. A means for preventing the resin formed part 2 from being damaged by the reflected laser beam 6 and the plume 5 is provided. By setting an interior angle formed by the surface of the working part 1 and the side surface of the resin formed part 2 to an obtuse, and by providing a protection wall on the side surface of the resin formed part 2, cooling the plume 5 so that the plume 5 is reduced, spraying halogenated gas, controlling the irradiation direction of the laser beam 4 so that the reflected laser beam 6 is detached from the resin forming part 2, and by providing an absorbing layer of the laser beam 4 on the surface of the working part 1, a damage preventing means for making the surface of the working part 1 rough is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser processing method for irradiating a processing portion of a workpiece such as an electromagnetic relay with a laser beam, and more particularly to a resin molding portion protruding from a surface of the processing portion and closely disposed. The present invention relates to a laser processing method and an electromagnetic relay performed on a workpiece having the same.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
A laser processing method for welding an electromagnetic relay as described in JP-A-315724 has been proposed. In this laser processing method, when the conductive members 33 of the electromagnetic relay are laser-welded to each other, the laser 4 is simultaneously applied to the welding location from a plurality of different directions so that the welding location has a predetermined energy density.

[0003] In such a laser processing method, the laser processing is performed by irradiating a laser 4 having a small laser output from a plurality of different directions. There is no burning of the resin molding 2 such as the base around the laser reflected light.

[0004]

However, in the above-mentioned conventional laser processing method, there is a problem that the plume 5 generated by irradiating the conductive member 33 with the laser comes into contact with the resin molding 2 and burns the resin molding 2. is there. Plume 5
Refers to a metal plasma generated in a direction substantially perpendicular to the surface of the processing portion 1 when the surface of the processing portion 1 made of a conductive material is irradiated with the laser 4, and is of such an extent that the resin material is sufficiently burned when touching the resin material. Has high temperature.

Further, there is a problem that a laser irradiation structure for irradiating the laser 4 from a plurality of different directions becomes complicated.

[0006] In addition to the electromagnetic relay, the conductive member 33
When a workpiece having a processed part 1 such as a workpiece and a resin molded part 2 protruding from the surface of the processed part 1 and disposed close to the processed part 1 is processed by laser irradiation other than welding, such as cutting or drilling of the processed part 1 Also, similarly to the above, there is a problem that the resin molded portion 2 is burned by the plume 5 and the laser reflected light 6.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for processing a processing portion by laser irradiation, in which laser reflected light generated by laser irradiation on the processing portion and plumes. Another object of the present invention is to provide a simple laser processing method having a configuration for preventing burning of a resin molded portion due to at least one of the above.

[0008]

In order to achieve the above object, an invention according to claim 1 is a work piece having a processing portion 1 and a resin molding portion 2 protruding from the surface of the processing portion 1 and closely arranged. In a laser processing method of forming a material and irradiating the surface of the processing section 1 with a laser 4 to perform processing, a resin molding section 2 formed by at least one of a laser reflected light 6 and a plume 5 generated by laser irradiation on the processing section 1. It is characterized in that it is provided with a burnout prevention means for preventing the burnout of the steel.

In such a laser processing method, the processing section 1
Burnout of the resin molded part 2 due to at least one of the laser reflected light 6 and the plume 5 generated by laser irradiation on the resin is prevented by burnout prevention means.

According to a second aspect of the present invention, in the first aspect of the present invention, the burnout preventing means is provided on the surface of the processing portion 1 on the side of the resin molding portion 2 to prevent the plume 5 from blocking. It is characterized by becoming.

In such a laser processing method, the processing section 1
Since the plume 5 is blocked by the protective wall 7 provided on the surface of the resin molding portion 2 on the surface, the plume 5 does not contact the resin molding portion 2 and the burning of the resin molding portion 2 by the plume 5 is prevented. I have.

Further, the invention according to claim 3 is characterized in that, in the invention according to claim 1, the burnout prevention means is cooling of the plume 5 such that the plume 5 is reduced.

In such a laser processing method, the plasma state of the plume 5 is reduced by cooling, the plume 5 is reduced, and the energy of the plume 5 is reduced. The molded part 2 does not burn out.

Further, the invention according to claim 4 is characterized in that, in the invention according to claim 1, the burnout prevention means is spraying a halogenated gas onto the plume 5 so that the plume 5 is reduced. ing.

In such a laser processing method, since the halogenated gas reduces electrons in the plume 5 and reduces the energy of the plume 5, the energy of the plume 5 is reduced. Also, the resin molded part 2 does not burn out.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the burnout prevention means controls the laser irradiation direction such that the laser reflected light 6 moves away from the resin molding 2. Make up.

In such a laser processing method, the laser reflected light 6 is irradiated on the surface of the processing section 1 by controlling the laser irradiation direction so that the laser reflected light 6 moves away from the resin molding section 2, so that the laser reflected light 6 is irradiated with the resin. This prevents the resin molded part 2 from burning due to the laser reflected light 6 without contacting the molded part 2.

According to a sixth aspect of the present invention, in the first aspect of the present invention, the burnout preventing means comprises a laser absorbing layer 31 provided on the surface of the processed portion 1.

In such a laser processing method, since the laser absorbing layer 31 absorbs the laser beam 4 and reduces the laser reflected light 6, the laser reflected light 6 is prevented from irradiating the resin molding portion 2, and the laser reflected light 6 is reflected. Burnout of the resin molded part 2 by the light 6 can be prevented.

Further, the invention according to claim 7 is characterized in that, in the invention according to claim 1, the burnout preventing means comprises an uneven portion 32 provided on the surface of the processing portion 1 and irregularly reflecting the laser. I have.

In such a laser processing method, the uneven portion 3
The laser reflection light 6 irradiates the resin molded part 2 by irregularly reflecting the laser 4, so that the resin molded part 2 can be prevented from being burned by the laser reflected light 6.

According to another aspect of the present invention, there is provided an electromagnetic processing apparatus comprising: a processing section 1 whose surface is irradiated with a laser beam 4 to be welded; and a resin molding section 2 protruding from the surface of the processing section 1 and closely disposed. The relay is characterized in that the interior angle between the surface of the processing portion 1 and the side surface of the resin molding portion 2 on the processing portion 1 side is formed to be an obtuse angle.

In such an electromagnetic relay, since the inner angle between the surface of the processing portion 1 and the side surface of the resin forming portion 2 on the side of the processing portion 1 is obtuse, the laser 4 is irradiated from a position facing the surface of the processing portion 1. However, the laser reflected light 6 and the plume 5 can be prevented from reaching the resin molded part 2.

According to a ninth aspect of the present invention, there is provided an electromagnetic processing apparatus having a processing section 1 whose surface is irradiated with a laser beam 4 and welded thereto, and a resin molding section 2 protruding from the surface of the processing section 1 and closely disposed. The relay is characterized in that a protection wall 7 for blocking the laser reflected light 6 and the plume 5 generated by irradiating the processing section 1 with the laser is provided upright on the resin molding section 2 side on the processing section 1 surface. ing.

In such an electromagnetic relay, the plume 5 and the laser reflected light 6 are blocked by the protection wall 7 erected on the surface of the processing part 1 so that the plume 5 and the laser reflected light 6 do not touch the resin molded part 2. ing.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A laser processing method according to an embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a sectional view of a main part showing a laser processing method according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of an electromagnetic relay to which the laser processing method is applied. FIG. 3 is an explanatory view showing a process of forming one component of the electromagnetic relay according to the first embodiment.

As shown in FIG. 1, in this laser processing method, a workpiece having a processing portion 1 and a resin molding portion 2 protruding from the surface of the processing portion 1 and closely disposed is formed. The surface is processed by irradiating the laser 4 with a laser. The device has a burnout preventing means for preventing burnout of the resin molded portion 2 by at least one of the laser reflected light 6 and the plume 5 generated by the laser irradiation on the processing portion 1. Is what it is. In this case, the burnout prevention means forms an obtuse angle between the surface of the processing part 1 and the side surface of the resin molding part 2 on the processing part 1 side. The plume 5 refers to a metal plasma generated in a direction substantially perpendicular to the surface of the processing portion 1 when the surface of the processing portion 1 made of a conductive material is irradiated with the laser 4 and sufficiently burns the resin material when the resin material is touched. Has a high temperature.

As the material of the processing portion 1, a metal material such as copper, aluminum, iron or the like is suitably used. Examples of the type of processing include welding, cutting, and drilling. Here, an electromagnetic relay is used as a workpiece, and a laser 4 welding method for welding the processed portions 1 of the electromagnetic relay with a laser 4 will be described as an example of a laser processing method.

As shown in FIGS. 2 and 3, the electromagnetic relay
An electromagnet block 15 including an iron core 11, a coil 12, a permanent magnet 13, and a coil bobbin 14 is integrally molded with a terminal 16 from a resin material to form a block. This block is hereinafter referred to as a body block 18. The armature block 19 is placed on the body block 18.
Is mounted and the cover 20 is attached.

The electromagnet block 15 is a substantially U-shaped iron core 1.
The coil bobbin 14 is integrally formed with the iron core 11 by insert-molding the coil bobbin 1 into the coil bobbin 14.
A coil 12 is wound around the body of No. 4 and a permanent magnet 13 is interposed between both side pieces of the iron core 11. The terminals 16 include a fixed contact terminal 21 having a fixed contact portion 21a formed at a base end and a common contact terminal 22a having a common terminal portion 22a formed at a base end with a fixed portion 27c of a contact spring 27 to be described later. And a coil terminal 23 for energizing the coil 12. These terminals 16 are aligned with the electromagnet block 15 and are integrally molded with a resin material.

A cover 20 is attached to a side end of the mounting portion 24 on which the armature block 19 is mounted, and a bottom plate portion 25 for sealing the inside is provided. This bottom plate 25
Are formed as a part of a resin mold portion 28 made of a resin material of the body block 18, and protrude from the surface of the common terminal portion 22 a and are arranged close to each other. The bottom plate portion 25 forms the resin molded portion 2 of the electromagnetic relay as the workpiece.
Further, the interior angle between the side surface on the common terminal portion 22a side of the resin molded portion 2 and the surface of the common terminal portion 22a is formed to be an obtuse angle.

The terminal 16 protruding from the side opposite to the bottom plate 25 is integrally molded with the electromagnet block 15 with a resin material, and then bent along the outer surface of the resin molded portion 28 to form a leg. Are the terminals 16 on the bottom plate 25 side.
Are formed substantially parallel to the legs. Thus, the body block 18 is completed.

The armature block 19 is a plate-shaped armature 2
6 and a contact spring 27 integrally attached to the armature 26. The armature 26 and the contact spring 27 are molded integrally with a resin material. Movable contacts 27a extend from both ends of the contact spring 27, and a hinge spring piece 27b projects from one side of the armature 26 at the center, which is displaced from the pivot point. Hinge spring piece 27b
A fixing portion 27c that is welded and fixed to the common terminal portion 22a of the common contact terminal 22 is formed at a tip end of the common contact terminal 22, whereby the contact spring 27 is electrically connected to the common contact terminal 22.
The fixing portion 27c is fixed to the common terminal portion 22a in a state where the fixing portion 27c is overlapped on the common terminal portion 22a.
This is performed by irradiating the upper surface c with the laser 4 and welding. The fixing portion 27c forms the processed portion 1 of the electromagnetic relay as the workpiece.

The inner angle between the surface of the fixing portion 27c and the side surface of the armature 26 is the same as that of the common terminal portion 22 in the resin molded portion 2.
An obtuse angle is formed which is substantially the same as the inner angle between the side surface on the side a and the surface of the common terminal portion 22a. Therefore, the common terminal 2
When the fixing portion 27c is overlaid on 2a, the inner angle θ formed between the surface of the fixing portion 27c and the side surface of the resin molded portion 2 on the side of the common terminal portion 22a is an obtuse angle. By making the internal angle θ an obtuse angle, a means for preventing burning of the laser reflected light 6 and the plume 5 generated by irradiating the fixing portion 27c with the laser is formed.

The cover 20 has a box shape with an open lower surface, and a sealing portion 20a is formed in a corner portion of the upper surface as a gap for preventing internal rupture and sealing. The cover opening 20b is formed in substantially the same shape as the bottom plate portion 25 of the body block 18, and when the cover 20 is attached to the body block 18, the bottom plate portion 25 substantially fits into the cover opening 20b. . Cover 2 for body block 18
The attachment of 0 is performed as follows. First, the cover 20 is put on the body block 18 from the side opposite to the terminal 16.
At this time, the end of the side wall of the cover 20 slightly protrudes from the lower surface of the bottom plate 25. Next, the bottom plate 25 is directed upward, and the sealing material is dropped and injected onto the bottom plate 25 surrounded by the end of the side wall of the cover 20. The injection of the sealing material is performed at a high temperature of about 150 ° C. At this time, the sealing material is liquefied, spreads over the entire lower surface of the bottom plate 25, and fills the gap between the outer periphery of the bottom plate 25 and the cover opening 20b. Further, the inside sealed at high temperature by the sealing portion 20a is prevented from bursting. further,
After the sealing material is solidified at room temperature, the sealing portion 20a is closed to make the interior completely a sealed space. Thus, the electromagnetic relay is completed.

The operation of the electromagnetic relay will be briefly described below. In this electromagnetic relay, the end of the armature 26 on the protruding side of the hinge spring piece 27 b is moved by the magnetomotive force of the permanent magnet 13 in the stationary state when the energization of the coil 12 is stopped.
1 is attracted to the magnetic pole surface. Now, the end of the armature 26 on the side not attracted to the magnetic pole surface is
When the coil 12 is energized so as to be attracted to the magnetic pole surface of
The end of the armature 26 is attracted to the iron core 11, and the armature block 19 swings to attract the armature 26 to the side piece of the iron core 11. At this time, the movable contact 2 at one end of the contact spring 27
7a contacts the fixed contact portion 21a. This state is maintained until the energization of the coil 12 is stopped. When the energization of the coil 12 is stopped, the end of the armature 26 on the projecting side of the hinge spring piece 27 b is attracted to the magnetic pole surface of the iron core 11 by the magnetomotive force of the permanent magnet 13, and returns to a fixed state. Let it.

A method of welding the fixing portion 27c to the common terminal portion 22a by laser irradiation will be described below.

In this electromagnetic relay, the laser 4 is applied to the approximate center of the surface of the fixing portion 27c by a laser irradiation device disposed above the fixing portion 27c. The laser irradiation direction is set substantially parallel to the side surface of the resin molded portion 2 on the side of the common terminal portion 22a. At this time, since the inner angle θ formed between the surface of the fixing portion 27c and the side surface of the resin molded portion 2 on the side of the common terminal portion 22a is formed at an obtuse angle, the laser 4 enters the surface of the fixing portion 27c obliquely. Will do. Therefore, the plume 5 generated by laser irradiation on the surface of the fixing portion 27c is generated in a direction substantially perpendicular to the surface of the fixing portion 27c, that is, in a direction away from the resin molded portion 2. The laser reflected light 6 from the surface of the fixing portion 27c is generated in an equal reflection direction with respect to the incident direction of the laser 4 to the common terminal 22a.

In such an electromagnetic relay, the fixing portion 27c
Since the inner angle θ between the front surface and the side surface of the resin molded portion 2 on the side of the common terminal portion 22a is an obtuse angle, even if the laser 4 is irradiated from the position facing the surface of the fixing portion 27c, the laser reflected light 6
Further, the plume 5 can be prevented from reaching the resin molding portion 2. Therefore, burning of the resin molded part 2 by the laser reflected light 6 and the plume 5 does not occur, and the quality by laser welding is stable.

FIG. 4 is an explanatory view for explaining a laser processing method different from the above in the electromagnetic relay according to the embodiment of the present invention, and is a longitudinal sectional view of a main part.

As shown in FIG. 4, the electromagnetic relay and the laser processing method are formed substantially in the same manner as the above-described electromagnetic relay and laser processing method, and the surface of the fixing portion 27c is formed by a laser irradiation device disposed above the fixing portion 27c. Laser 4 in the approximate center of
Irradiation and welding. The difference is that the fixing portion 27
An inner angle θ between the c surface and the side surface of the resin molded portion 2 on the side of the common terminal portion 22a is formed at a substantially right angle,
As a means for preventing burnout, the resin molded portion 2 above the fixing portion 27c is used.
Defense wall 7 that blocks plume 5 and laser reflected light 6 on the side
Is provided.

The defense wall 7 is formed in a substantially L-shape, and is provided with a vertical plate 7a which is disposed in close proximity to the side surface of the resin molding portion 2 on the side of the common terminal portion 22a, and which is in proximity to the upper surface of the resin molding portion 2. And a horizontal plate 7b that is disposed to face the
It is arranged on the resin molding part 2 side above the fixing part 27c. When a material having a low laser absorptivity, such as copper, is used for the protection wall 7, it is possible to prevent the protection wall 7 itself from being damaged by the laser reflected light 6. Further, when a high melting point material such as tungsten is used for the protection wall 7, it is possible to prevent the plume 5 from burning the protection wall 7 itself.

In such a laser processing method, the fixing portion 2
7c, the plume 5 and the laser reflected light 6 generated by the laser irradiation on the surface are blocked by the defense wall 7, and the plume 5
Further, the resin molded portion 2 is protected so that the laser reflected light 6 does not touch. Therefore, burning of the resin molded part 2 by the laser reflected light 6 and the plume 5 does not occur, and the quality by laser welding is stable.

FIG. 5 is an explanatory view for explaining a laser processing method different from the above in the electromagnetic relay according to the embodiment of the present invention, and is a longitudinal sectional view of a main part.

As shown in FIG. 5, the electromagnetic relay and the laser processing method are formed in substantially the same manner as the above-described electromagnetic relay and the laser processing method. The difference is that the protective wall 7 for blocking the laser reflected light 6 and the plume 5 as the burnout prevention means is integrally provided upright on the resin molded portion 2 side on the surface of the fixing portion 27c.

In such an electromagnetic relay, the resin molded portion 2
The plume 5 and the laser reflected light 6 are blocked by the defense wall 7 so as not to touch the. In addition, the defense wall 7 is
Since it is formed integrally with 7c, the trouble of arranging the protection wall 7 on the resin molding portion 2 side above the fixing portion 27c at the time of laser irradiation can be omitted. Note that, in this example, the defense wall 7 is
7c, it may be formed integrally with the common terminal portion 22a.

FIG. 6 is an explanatory view for explaining a laser processing method different from the above in the electromagnetic relay according to the embodiment of the present invention, and is a longitudinal sectional view of a main part.

As shown in FIG. 6, the electromagnetic relay and the laser processing method are formed in substantially the same manner as the above-described electromagnetic relay and the laser processing method. The difference is that a halogenated gas that reduces the plume 5 is blown to the plume 5 as a means for preventing burning. The plume 5 is driven away from the resin molding 2 by the wind force of the blowing gas 29. Note that fluorine gas or the like is preferably used as the halogenating gas.

In such a laser processing method, since the plume 5 is forcibly driven away from the resin molded portion 2, the plume 5 can be prevented from touching the resin molded portion 2. In addition, as a method for forcing the plume 5 away from the resin molding part 2 in this way, other than this, a method of sucking the plume 5 by a suction device provided on the opposite side to the resin molding part 2 or a method of sucking the plume 5 Examples include a method in which a magnetic field is used to direct ions and electrons in the constituent metal plasma.

FIG. 7 is an explanatory view for explaining a laser processing method different from that of the above-described electromagnetic relay according to the embodiment of the present invention, and is a longitudinal sectional view of a main part.

As shown in FIG. 7, the electromagnetic relay and the laser processing method are formed in substantially the same manner as the above-described electromagnetic relay. The difference is that the plume 5 is cooled as a means for preventing burnout. As a cooling method of the plume 5, a cooling gas 3 which has cooled air, argon, nitrogen, etc.
0 is sprayed toward the plume 5 from above the fixing portion 27c.

In such a laser processing method, the plasma state of the plume 5 is reduced by cooling and the energy of the plume 5 is reduced.
The resin molded portion 2 does not burn out even if it comes into contact with the resin.

Further, the width of the plume 5 becomes wider as the melting range of the surface of the fixing portion 27c by the laser irradiation becomes wider. The range becomes narrow, and the width of the plume 5 can be narrowed. Thereby, the plume 5 may be prevented from touching the resin molded part 2.

The plume 5 may be prevented from touching the resin molded part 2 by making the laser irradiation position on the surface of the fixing part 27c farther than the resin molded part 2.

FIG. 8 is an explanatory view for explaining a laser processing method different from that of the embodiment of the present invention, and is a longitudinal sectional view of a main part.

As shown in FIG. 8, this laser processing method is substantially the same as the above-described laser processing method. The difference is that the resin molding 2
The laser 4 is irradiated from above to the surface of the fixing portion 27c in the obliquely downward direction.

In such a laser processing method, since the laser reflected light 6 is generated in a direction away from the resin molded part 2, the laser reflected light 6 is prevented from irradiating the resin molded part 2, and the laser reflected light 6 is prevented. 6 can prevent the resin molded part 2 from burning.

FIG. 9 is an explanatory view for explaining a laser processing method different from that of the embodiment of the present invention, and is a longitudinal sectional view of a main part.

As shown in FIG. 9, this laser processing method is substantially the same as the above-described laser processing method. The difference is that the fixing portion 27c
This means that the laser absorption layer 31 is provided on the surface. As the laser absorbing layer 31, a laser absorbing oxide film or nickel plating is preferably used.

In such a laser processing method, since the laser absorbing layer 31 absorbs the laser beam 4 and reduces the laser reflected light 6, the laser reflected light 6 is prevented from irradiating the resin molding portion 2 and the laser reflected light is reflected. Burnout of the resin molded part 2 by the light 6 can be prevented.

FIG. 10 is an explanatory view for explaining a laser processing method different from that of the embodiment of the present invention, and is a longitudinal sectional view of a main part.

As shown in FIG. 10, this laser processing method is substantially the same as the above-described laser processing method. The difference is that the fixing portion 27c
That is, the uneven portion 32 for irregularly reflecting the laser is provided on the surface. The uneven portion 32 is formed in a saw blade shape.

In such a laser processing method, the uneven portions 3
The laser reflection light 6 irradiates the resin molded part 2 by irregularly reflecting the laser 4, so that the resin molded part 2 can be prevented from being burned by the laser reflected light 6.

[0065]

According to the first aspect of the present invention, burnout of the resin molded portion due to at least one of a laser reflected light and a plume generated by laser irradiation on the processed portion is prevented by the burnout prevention means, and the laser processing quality is improved. doing. Also,
Since the laser can be irradiated from one direction, the laser irradiation structure is simple.

According to the second aspect of the present invention, since the plume is blocked by the protective wall provided on the surface of the processed portion on the side of the resin molded portion, the plume does not come into contact with the resin molded portion, and the resin by the plume does not come into contact. Prevents burnout of molded parts.

According to the third aspect of the present invention, since the plasma state of the plume is reduced by cooling, the plume is reduced, and the energy of the plume is reduced. Does not burn.

According to the fourth aspect of the present invention, since the halogen gas reduces the electrons in the plume to reduce the plume and the energy of the plume, the energy of the plume is reduced. The part does not burn.

According to the fifth aspect of the present invention, the laser reflected light is irradiated on the surface of the processing portion by controlling the laser irradiation direction so that the laser reflected light moves away from the resin molded portion. To prevent burning of the resin molded part due to the laser reflected light.

According to the sixth aspect of the present invention, since the laser absorbing layer absorbs the laser and reduces the laser reflected light, it is possible to prevent the laser reflected light from irradiating the resin molding portion, and to reduce the resin reflected by the laser reflected light. Burnout of the molded part can be prevented.

According to the seventh aspect of the present invention, since the uneven portion reflects the laser irregularly and the laser reflected light applied to the resin molded portion is reduced, burning of the resin molded portion due to the laser reflected light can be prevented.

Further, in the invention according to claim 8, since the inner angle between the surface of the processed portion and the side surface of the resin molded portion on the side of the processed portion is an obtuse angle, even if the laser is irradiated from a position facing the surface of the processed portion. The laser reflected light and the plume can be prevented from reaching the resin molded part.

According to the ninth aspect of the present invention, the laser reflected light and the plume are shielded by the defense wall provided on the surface of the processed portion so that the plume does not touch the resin molded portion.

[Brief description of the drawings]

FIG. 1 is an explanatory view illustrating a laser processing method according to an embodiment of the present invention, and is a longitudinal sectional view of a main part.

FIG. 2 is an exploded perspective view of an electromagnetic relay on which the laser processing method is performed.

FIG. 3 is an explanatory view showing a process of forming one component of the electromagnetic relay according to the first embodiment.

FIG. 4 is an explanatory view illustrating a laser processing method different from the above in the electromagnetic relay according to the embodiment of the present invention, and is a longitudinal sectional view of a main part.

FIG. 5 is an explanatory view illustrating a laser processing method different from the above in the electromagnetic relay different from the above according to the embodiment of the present invention, and is a longitudinal sectional view of a main part.

FIG. 6 is an explanatory view illustrating a laser processing method different from the above in the electromagnetic relay according to the embodiment of the present invention, and is a longitudinal sectional view of a main part.

FIG. 7 is an explanatory view illustrating a laser processing method different from the above in the electromagnetic relay according to the embodiment of the present invention, and is a longitudinal sectional view of a main part.

FIG. 8 is an explanatory view for explaining a laser processing method different from the above according to the embodiment of the present invention, and is a longitudinal sectional view of a main part.

FIG. 9 is an explanatory view for explaining a laser processing method different from that of the embodiment of the present invention, and is a longitudinal sectional view of a main part.

FIG. 10 is an explanatory view for explaining a laser processing method different from the above according to the embodiment of the present invention, and is a longitudinal sectional view of a main part.

11A and 11B are explanatory views illustrating a conventional welding method, in which FIG. 11A is a perspective view of a main part, and FIG. 11B is a longitudinal sectional view of the main part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Processing part 1 2 Resin molding part 4 Laser 5 Plume 6 Laser reflected light 7 Protective wall 7a Vertical plate 7b Horizontal plate 11 Iron core 12 Coil 13 Permanent magnet 14 Coil bobbin 15 Electromagnetic block 16 Terminal 17 Resin molding part of body block 18 Body block 19 Armature Block 20 Cover 20a Sealing Part 20b Cover Opening 21 Fixed Contact Terminal 21a Fixed Contact Part 22 Common Contact Terminal 22a Common Terminal Part 23 Coil Terminal 24 Placement Part 25 Bottom Plate Part 26 Armature 27 Contact Spring 27a Movable Contact 27b Hinge Spring piece 27c Fixed part 28 Resin molded part of armature block 29 Blowing gas 30 Cooling gas 31 Laser absorption layer 32 Uneven part 33 Conductive member

Claims (9)

[Claims] 1. A workpiece having a processed portion and a resin molded portion protruding from the surface of the processed portion and closely disposed, is formed.
In the laser processing method of irradiating a laser to the surface of the processing portion, the laser processing method includes a burnout preventing means for preventing the resin molded portion from being burned out by at least one of a laser reflected light and a plume generated by laser irradiation on the processing portion. A laser processing method characterized by the above-mentioned. 2. The laser processing method according to claim 1, wherein the burnout prevention means comprises a protective wall provided on the surface of the processing portion on the resin molding portion side to block the plume. 3. The laser processing method according to claim 1, wherein the burnout prevention means is cooling of the plume so as to reduce the plume. 4. The laser processing method according to claim 1, wherein the burnout preventing means is spraying a halogenated gas onto the plume to reduce the plume. 5. The laser processing method according to claim 1, wherein the burnout prevention means controls the laser irradiation direction such that the laser reflected light moves away from the resin molded part. 6. The laser processing method according to claim 1, wherein the burnout prevention means comprises a laser absorption layer provided on a surface of the processing portion. 7. The laser processing method according to claim 1, wherein the burnout preventing means comprises an uneven portion provided on the surface of the processing portion and irregularly reflecting the laser. 8. An electromagnetic relay having a processed portion to be welded by irradiating a laser to the surface thereof, and a resin molded portion protruding from the surface of the processed portion and closely disposed, the processing at the processed portion surface and the resin molded portion. An electromagnetic relay, characterized in that an inner angle formed between the inner side and the side surface of the part is formed at an obtuse angle. 9. An electromagnetic relay having a processed portion to be welded by irradiating a laser to the surface thereof, and a resin molded portion protruding from the surface of the processed portion and closely disposed, generated by laser irradiation to the processed portion. An electromagnetic relay, wherein a defense wall for blocking a plume is provided upright on a resin molding portion side on a surface of a processed portion.