JP2014177051A - Method for laser welding weld material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method free from the occurrence of inclination or strain in a cover made of transmissive resin material or a case made of absorptive resin material due to presence of a welded spot and an unwelded spot in conventional laser welding.SOLUTION: A ring-shaped part to be welded of a cover 6 molded of transmissive resin material and a case 7 molded of absorptive resin material is exposed to simultaneous irradiation of a plurality of laser beams, so that at least a projecting rib 13 is melted. Consequently a plurality of weld spots at the ring-shaped part to be welded of the cover 6 and the case 7 can be simultaneously welded. The weld parts 14 formed at the respective weld spots of the ring-shaped part to be welded of the cover 6 and the case 7 are continuously connected in a ring shape. As a result, no gap is formed in the ring-shaped part to be welded of the cover 6 and the case 7, thereby preventing weld defects at the ring-shaped part to be welded.

Description

  The present invention superimposes a transmitting material that is permeable to laser light and an absorbing material that is absorbing to the laser light, and applies a laser to an annular weld planned portion (joint) between the transmitting material and the absorbing material. The present invention relates to a laser welding method of a welded body in which a transmitting material and an absorbing material are simultaneously laser-welded by irradiating light.

[Conventional technology]
Conventionally, a laser of a resin welded body provided with a transparent resin material (transmitting material) that is transparent to laser light (beam) and an absorbent resin material (absorbing material) that is absorbable to laser light. Welding methods are known.
The single laser irradiation device used in this laser welding method is equipped with a laser light source for generating laser light and a condensing lens for condensing the laser light, and the laser light emitted from the laser light source A laser irradiation unit for irradiating the planned welding part of the transparent resin material and the absorbent resin material, a laser transmission means for transmitting the laser light emitted from the laser light source to the laser irradiation unit, and the transparency Pressurization part (pressing jig) that presses (or presses) the joint surface of the resin material toward the absorbent resin material side, and laser irradiation that moves the irradiation position of the laser light irradiated from the laser irradiation part to the planned welding part Position moving means.

Then, the laser welding method using a single laser irradiation apparatus is such that the permeable resin material is first contacted with the tip of the triangular protrusion protruding from the bonding surface of the absorbent resin material. And an absorbent resin material.
Next, the vicinity of the laser irradiation position of the laser beam irradiated to the planned welding portion between the permeable resin material and the absorbent resin material is pressurized with a pressing jig.
Next, the laser irradiation position is moved relative to the planned welding portion along the laser beam scanning path so as to drive the pressing position by the holding jig.
Thereby, the laser beam which permeate | transmitted the permeable resin material is absorbed by the absorptive resin material, and it heat | fever-generates, and the triangular protrusion and the joining surface vicinity of both members fuse | melt.
In this state, when the irradiation of the laser beam is stopped, the melted portion of both members is cooled and solidified.
As a result, it is possible to obtain a resin welded body having a welded portion by welding with a laser beam while pressing the joining surface of the permeable resin material against the triangular protrusions of the absorbent resin material with a holding jig.

However, in the conventional laser welding method, there is a possibility that a crack (crack) may occur in the transparent resin material when the thickness of the transparent resin material is thin.
Therefore, for the purpose of preventing the occurrence of cracks in the permeable resin material, as shown in FIG. 9, at the tip of the triangular ridge 103 protruding from the joint surface of the flange 102 of the case 101 made of the absorbent resin material, The flanges 102 and 105 are overlapped and pressurized so that the joint surface of the flange 105 of the cover 104 made of transparent resin material is in contact with the case 101 and the cover 104 through the flange 105 while applying pressure. When the annular welding planned portion is irradiated to heat and melt the triangular protrusion 103 to laser-weld the joining surface of the case 101 and the joining surface of the cover 104, the joining surface of the case 101 and the joining surface of the cover 104 are A laser welding method for welding the entire circumference or a plurality of locations has been proposed (see, for example, Patent Document 1).
This limits the height of the triangular protrusion 103 from the joint surface of the flange 102 of the case 101 to 0.03 to 0.08 mm, thereby reducing cracks and reducing the welding failure rate.

[Conventional technical problems]
However, in the case of the laser welding method described in Patent Document 1, for the purpose of welding the entire circumference or a plurality of locations between the joint surface of the case 101 and the joint surface of the cover 104, the irradiation end from the laser light irradiation start position (S) is completed. When the annular welding planned portion between the case 101 and the cover 104 is welded while moving the irradiation position of the laser light sequentially toward the position (E), the welded portion (welded portion 106) and the unwelded portion Since the (unwelded portion) exists, the case 101 or the cover 104 is inclined, and the case 101 or the cover 104 is distorted.

Further, since a gap is formed between the joint surface of the flange 102 of the case 101 and the joint surface of the flange 105 of the cover 104, there is a problem in that poor welding occurs.
In addition, when the welded portion 106 has a structure close to other parts, there is a problem that the deformation of the case 101 or the cover 104 generated in the welding process also affects the other parts and affects the product function. For example, in the case of a part having a shaft, the direction of the shaft is shifted due to the deformation of welding.
Further, there is a problem that the case 101 or the cover 104 is welded while being deformed during the welding process by melting the beads such as the triangular protrusion 103.

In addition, by splitting laser light emitted from a single laser light source into a plurality of laser lights by using a diffraction optical component, a joint portion (a plurality of welded portions) between a transparent resin material and an absorbent resin material is formed. A laser irradiation apparatus capable of welding at the same time has been proposed (see, for example, Patent Document 2).
However, the laser irradiation apparatus described in Patent Document 2 is suitable for welding in a narrow range, and if it is attempted to weld a wide range at the same time, energy is dispersed, so that the efficiency is low and is not suitable.

Japanese Patent No. 4678021 Japanese Patent No. 3925169

An object of the present invention is to provide a laser welding method of a welded body capable of simultaneously welding a wide range of welding locations. Another object of the present invention is to provide a laser welding method for a welded body that can shorten the welding time by simultaneously welding a plurality of welding locations.
It is another object of the present invention to provide a laser welding method for a welded body that can suppress the occurrence of problems that the transmission material or the absorption material is inclined or the transmission material or the absorption material is distorted.

In the invention according to claim 1 (laser welding method), first, the joining surface of the transmitting material that transmits the laser light is brought into contact with the tip of the protruding portion protruding from the joining surface of the absorbing material that absorbs the laser light. In addition, the transmitting material and the absorbing material are overlaid (step).
Next, the vicinity of each irradiation position of the plurality of laser beams irradiated simultaneously to a plurality of locations in the annular welding scheduled portion of the transmission material and the absorption material is respectively pressurized with a plurality or a single pressure unit (step) ).
Next, a plurality of laser light beams are simultaneously irradiated to a plurality of locations in the annular welding scheduled portion through the transmitting material to melt at least the protrusions, thereby forming a welding portion at each of the plurality of locations in the annular welding scheduled portion (step). .
Next, by sequentially moving the irradiation positions of the plurality of laser beams along the scanning paths of the plurality of laser beams with respect to the annular welding scheduled portion, the welding portions are continuously formed in an annular shape. (Process).

According to the first aspect of the present invention, by simultaneously irradiating a plurality of laser beams with a plurality of laser beams to a plurality of locations in the annular welding planned portion through the transmitting material, at least the protrusions are melted, A welded portion is formed on the surface. And each welding position of a some laser beam is relatively moved with respect to a cyclic | annular welding plan part along each scanning path | route of a some laser beam, and a welding part is formed cyclically | annularly. .
Therefore, by simultaneously irradiating a plurality of laser beams to the annular welding scheduled portion between the absorbent and the transmission material, a plurality of locations in the annular welding planned portion between the absorption material and the transmission material can be welded simultaneously. Moreover, poor welding can be prevented.
Further, since a plurality of welding locations can be welded simultaneously, the welding time can be shortened.
In addition, it is possible to suppress the occurrence of a problem that the transmission material or the absorption material is inclined or distorted.

It is the block diagram which showed the evaporative fuel processing apparatus (fuel tank sealing system) (Example 1). It is sectional drawing which showed the sealing valve unit provided with the resin welding body (Example 1). It is the block diagram which showed the several laser irradiation apparatus (Example 1). (A)-(c) is explanatory drawing which showed the laser welding method of the resin welded body (Example 1). It is explanatory drawing which showed the jig | tool pressurization range and the laser irradiation position (Example 1). It is explanatory drawing which showed each scanning path | route of the 1st, 2nd laser beam (Example 1). (A) is explanatory drawing which showed distortion of the valve seat surface, (b) is explanatory drawing which showed the amount of melt | dissolution of laser welding (comparative example 1). It is explanatory drawing which showed the irradiation plan path | route of a laser beam (comparative example 1). (A), (b) is explanatory drawing which showed the laser welding method (conventional technique).

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Configuration of Example 1]
1 to 6 show a laser welding method (Example 1) of a resin welded body to which the present invention is applied.

The laser welding method of the resin welded body of the present embodiment is applied to the laser welding method of the resin welded body 2 of the block valve unit 1 incorporated in the evaporative fuel processing apparatus (multiple locations simultaneous welding method using a plurality of laser beams). .
The block valve unit 1 includes a resin welded body 2, an electromagnetic block valve 3, and two first and second relief valves 4, 5 and the like.

The resin welded body 2 is formed by superimposing a cover 6 of a valve assembly and a case 7 of an electromagnetic actuator including a coil assembly, so that a plurality of laser beams are applied to an annular welding planned portion (joint portion) between the cover 6 and the case 7. By simultaneously irradiating, the cover 6 and the case 7 are continuously welded and joined at a plurality of locations simultaneously.
Further, between the cover 6 and the case 7, the electromagnetic sealing valve 3 and the valve seat 8 on which each of the first and second relief valves 4 and 5 can be seated, and the inside of the blocking valve unit 1 are provided. An annular packing 9 is sandwiched as a seal member that prevents leakage of evaporated fuel to the outside.

An annular flange (first facing portion) 11 is integrally formed on the opening periphery of the cover 6.
An annular flange (second facing portion) 12 is integrally formed on the periphery of the opening of the case 7. From the joint surface of the flange 12, the rib rib 13 projects so as to come into contact with the joint surface of the flange 11 of the cover 6. On the joint surface of the flange 12, the protruding rib 13 is continuously formed in an annular shape along an annular welding planned portion (an outer peripheral shape of the flange 12) between the cover 6 and the case 7.
The resin welded body 2 is irradiated with a plurality of laser beams (B1, B2) at least on the projecting ribs 13 so that at least the projecting ribs 13 are melted. ) Is set, the welded portion 14 is continuously formed in an annular shape at a predetermined annular weld planned portion.
The details of the block valve unit 1 and the laser welding method of the resin welded body 2 will be described later.

Here, as shown in FIG. 1, the evaporative fuel processing apparatus closes the electromagnetic blocking valve 3 installed between the fuel tank T and the canister C, so that the fuel tank T can be sealed. Has a closed system. This fuel tank sealing system is mounted on a vehicle such as a hybrid vehicle that travels using an internal combustion engine (engine) and an electric motor (motor) as power sources. The fuel tank sealing system includes a sealing valve unit 1, a fuel tank T, a canister C, an air filter F, a purge control valve PV, and a canister control valve CV, and is connected to an intake pipe 16 communicating with a combustion chamber for each cylinder of the engine. Has been.
The engine is connected to an intake pipe 16 that forms an intake passage through which intake air that has passed through an air cleaner flows, and an exhaust pipe (not shown) that forms an exhaust passage through which exhaust gas discharged from the combustion chamber flows. An intake throttle valve (throttle valve) 17 is provided in the intake pipe 16 to adjust the flow rate of intake air flowing in the intake passage communicating with the combustion chamber of each cylinder of the engine.

In addition, the fuel tank sealing system opens (opens) the electromagnetic block valve 3 when the fuel supply operation to the fuel tank T is performed, and the fuel supply that recovers the evaporated fuel in the fuel tank T into the canister C is performed. This is a dedicated canister system. This refueling dedicated canister system is an electromagnetic blocker as long as the pressure in the fuel tank T does not rise above a predetermined value when the vehicle such as an automobile is running or when the vehicle is not refueling when the vehicle is stopped. It becomes possible to maintain the closed state of the valve 3.
As a result, it is possible to reduce the evaporated fuel recovery load of the canister C, and it is possible to effectively purge the evaporated fuel adsorbed and held in the canister C toward the intake pipe 16 at the time of non-fuel supply.

The fuel tank T stores fuel to be supplied to the injector. An oil supply pipe 18 for refueling is attached to the fuel tank T. A fuel cap 19 is attached to the fuel filler port of the fuel filler pipe 18.
Further, inside the fuel tank T, a fuel pump (not shown) that supplies fuel to the injector under pressure, a pressure sensor (tank pressure sensor: not shown) that detects the pressure in the upper space (tank internal pressure) inside the fuel tank T And a liquid level sensor (remaining fuel amount sensor: not shown) for detecting the level of the stored fuel.

The canister C includes a cylindrical casing. An adsorbent (for example, activated carbon) 21 that adsorbs the evaporated fuel is accommodated inside the casing. The casing of the canister C is formed with a tank (inlet) port, a purge (outlet) port, and an atmospheric port (atmospheric release hole).
A vapor pipe 22 is connected to the tank port. A purge pipe 23 is connected to the purge port. An air introduction pipe 24 is connected to the air port. An air filter F that filters air flowing into the canister C is provided at the atmosphere introduction port of the atmosphere introduction pipe 24.

In the middle of the vapor pipe 22, an electromagnetic blocking valve 3 and two first and second relief valves 4, 5 are provided. The details of the electromagnetic blocking valve 3 and the two first and second relief valves 4 and 5 will be described later.
The purge pipe 23 is connected downstream of the throttle valve 17 in the intake air flow direction (the intake port side of the engine). A purge control valve PV for adjusting the purge amount of the evaporated fuel (evaporative gas, purge gas) is provided in the middle of the purge pipe 23.
In the middle of the air introduction pipe 24, a canister control valve CV for closing the air opening hole of the canister C as necessary is provided.

  In this embodiment, while a hybrid vehicle equipped with a fuel tank sealing system is running on a motor, no negative pressure is generated in the intake passage of the intake pipe 16, so the evaporated fuel adsorbed by the adsorbent 21 in the canister C is taken into the intake air. It cannot be fed into the intake passage of the pipe 16. Therefore, in order to prevent the adsorbent 21 in the canister C from excessively adsorbing the evaporated fuel and overflowing, the electromagnetic blocking valve 3 installed between the fuel tank T and the canister C is closed (fully closed). The fuel tank T is sealed (sealed).

  In the fuel tank sealing system, when fuel is supplied to the fuel tank T, a driver (driver) operates a fuel filler opening lever (not shown) provided with an opening switch (not shown) or the like. An opening signal is input to an engine control unit (electromagnetic valve control device: electronic control device: ECU) that controls the fuel tank sealing system, and the ECU that has input the opening signal opens (fully opens) the electromagnetic blocking valve 3. As a result, the vapor pipe 22 connecting the fuel tank T and the canister C communicates, so that the pressure of the fuel tank T can be reduced to atmospheric pressure, and even if the fuel cap 19 is opened, the fuel tank T passes through the fuel filler opening. Evaporated fuel can be prevented from being released to the outside air (atmosphere).

Next, details of the blocking valve unit 1 of the present embodiment will be described with reference to FIGS. 1 and 2.
The sealing valve unit 1 includes a resin welded body 2 that is laser-welded simultaneously at a plurality of locations, an electromagnetic blocking valve 3 that opens and closes a flow path formed in the vapor pipe 22, a pressure in the fuel tank T, and a pressure in the canister C. The first and second relief valves 4 and 5 are opened and closed according to the pressure difference between the first and second relief valves.
The resin welded body 2 includes a cover 6 integrally molded (molded) with a synthetic resin (laser transmitting resin material) that is a transmitting material that transmits laser light, and a synthetic resin (absorbing material that absorbs laser light). It is constituted by two divided cases composed of a case 7 integrally molded (molded) with a resin made of a laser-absorbing resin material.
A hollow portion (internal space) is formed between the cover 6 and the case 7. The hollow portion is separated (compartmentally formed) into five chambers (spaces 25 to 28) by the valve seat 8 and the packing 9.

The electromagnetic sealing valve 3 is a valve that is assembled in advance before the welding operation of the cover 6 and the case 7 by laser welding the joint end surface of the flange 11 of the cover 6 and the joint end surface of the welded portion of the flange 12 of the case 7. The assembly and the electromagnetic actuator including the coil assembly are coupled and integrated.
The valve assembly includes a cover 6, a valve seat 8, a bowl-shaped valve 31 having a sleeve portion 30, a hollow shaft 32, and a diaphragm 33.

The valve 31 is a seal valve in which synthetic rubber is attached to the surface of the seal portion seated on the valve seat 8. The valve 31 constitutes a valve body of a normally closed electromagnetic on-off valve.
The internal space of the sleeve portion 30 of the valve 31 communicates with a valve hole (described later) of the electromagnetic blocking valve 3. Further, the flow path in the shaft 32 fitted to the inner periphery of the sleeve portion 30 and the flow path in the moving core are the flow of gas such as evaporated fuel in the volume changing portion accompanying the displacement of the valve 31, the shaft 32 and the moving core. Is provided to ensure.
It should be noted that foreign matter enters the hollow portion (space, volume changing portion) communicating with the internal space of the valve 31 through the flow passage in the shaft 32 and the flow passage in the moving core (described later). A filter for preventing intrusion may be assembled.

The shaft 32 is a non-magnetic connecting portion that connects the valve 31 and a moving core (described later) so as to be integrally movable.
The diaphragm 33 is formed in a thin film annular shape with synthetic rubber. The outer peripheral edge of the diaphragm 33 is provided with an outer peripheral seal portion that hermetically seals a gap between the case 7 and the valve seat 8 and the diaphragm 33. The outer peripheral seal portion is held and fixed to the case 7 and the valve seat 8 while being sandwiched between the case 7 and the valve seat 8.

The valve seat 8 is formed with an annular valve seat on which the valve 31 can be seated. Inside the valve seat 8, a flow path hole (valve hole of the electromagnetic blocking valve 3) 34 through which the evaporated fuel passes is formed.
Further, the valve seat 8 includes a space 25 communicating with the flow path hole 34 between the case 7 and the diaphragm 33. A valve 31 and a shaft 32 are accommodated in the space 25 so as to be reciprocally movable.

  The electromagnetic actuator includes a coil assembly including a case 7, a magnetic movable core (moving core) 35, and a return spring 36 that biases the movable members (the valve 31, the shaft 32, and the moving core 35) in the valve closing direction. A magnetic coil inner peripheral fixed core (stator core 37) that forms a magnetic path on the inner peripheral side of a solenoid coil (described later), and a magnetic coil outer periphery that forms a magnetic path on the outer peripheral side of the solenoid coil A side fixed core (yoke 38) and a stopper 39 fitted and held inside the stator core 37 are provided.

The coil assembly includes a case 7 in which the valve seat 8 is sandwiched between the cover 6, a solenoid coil (hereinafter referred to as a coil) 41 in which a conductive resin-coated coil bobbin (resin bobbin) 40 is wound a plurality of times. The coil 41 and an external circuit (external power supply or external control circuit: ECU) are provided with an external connection connector for connection.
The coil 41 is a magnetic flux generating means (magnetic force generating means) that generates a magnetic force that draws the moving core 35 toward the magnetic attraction portion of the stator core 37 when supplied with electric power (when a current is applied or energized). When the coil 41 is energized, a magnetic circuit is formed in which magnetic flux concentrates through the moving core 35, the stator core 37, the yoke 38, and the like.

The coil 41 drives the valve 31, the shaft 32, and the moving core 35 in the valve closing direction by magnetic force.
The coil 41 has a coil portion wound around a bobbin and a pair of coil terminal leads drawn from the coil portion.
The pair of coil terminal leads are connected to an external circuit (external power source or external control circuit: ECU) via a terminal (external connection terminal) 42 of an external connection connector.
The outer peripheral portion of the coil 41 and the conductive annular welding planned portion (connection portion) between each coil terminal lead and each terminal 42 of the coil 41 are covered with a case 7 made of a synthetic resin (mold resin material) having insulation properties. Protected.
The outer periphery of the case 7 forms a connector case 43 of an external connection connector that exposes and accommodates the tips of the pair of terminals 42.

Here, the valve 31 of the electromagnetic blocking valve 3 is seated on the valve seat of the valve seat 8 by the urging force of the return spring 36 when the energization to the coil 41 is stopped (OFF). Thereby, since the flow path hole 34 is closed (fully closed), the electromagnetic blocking valve 3 is in a closed (closed) state. In the closed state of the electromagnetic blocking valve 3, the space in the fuel tank T and the space in the canister C are blocked (becomes a non-communication state).
On the other hand, the valve 31 is separated (separated) from the valve seat of the valve seat 8 when the coil 41 is energized (ON). Thereby, since the flow path hole 34 is opened (fully opened), the electromagnetic blocking valve 3 is opened (opened). In the open state of the electromagnetic blocking valve 3, a communication state is established in which the space in the fuel tank T and the space in the canister C communicate with each other via the vapor pipe 22. That is, when the fuel tank T and the canister C are in communication with each other, the evaporated fuel in the fuel tank T can be introduced into the canister C.

  The case 7 has a cylindrical flow channel pipe (inlet pipe) extending outward in the radial direction perpendicular to the reciprocating direction of the movable member (moving member) such as the valve 31, the shaft 32, and the moving core 35. 51 is provided. Inside the inlet pipe 51, a fluid channel (tank side channel: hereinafter referred to as an inlet port) 52 is formed. The inlet port 52 is located upstream of the hollow portion (space 25) in the gas flow direction. Further, the inlet port 52 communicates with the flow path hole 34 of the valve seat 8 through the space 25 when the valve 31 is detached from the valve seat 8, that is, when the electromagnetic blocking valve 3 is opened.

  On the other hand, the cover 6 is provided with a cylindrical flow path pipe (exit pipe) 53 extending toward the outside in the same direction as the reciprocating direction of the movable member. Inside the outlet pipe 53, a fluid channel (canister side channel: hereinafter referred to as an outlet) is located downstream of the hollow portion (space 28) formed between the cover 6 and the valve seat 8 in the gas flow direction. Port) 54 is formed. The outlet port 54 is always in communication with the flow path hole 34 of the valve seat 8. Further, the outlet port 54 communicates with the space 25 and the inlet port 52 via the flow path hole 34 and the space 28 when the valve 31 is detached from the valve seat 8, that is, when the electromagnetic blocking valve 3 is opened. .

  Here, a hollow portion (internal space) is formed between the cover 6 and the case 7. The hollow portion is partitioned into two spaces 26 and 27 by the valve seat 8. A cylindrical first valve guide 55 that supports the first relief valve 4 so as to be slidable back and forth is integrally formed on the end face of the valve seat 8 on the space 28 side. In addition, a cylindrical second valve guide 56 that integrally supports the second relief valve 5 so as to be slidable back and forth is integrally formed on the end face of the case 7 on the space 27 side.

  The 1st relief valve 4 is accommodated in the space 27 so that a reciprocation is possible. The first relief valve 4 is lifted to open the first valve hole 61 when the pressure in the fuel tank T is significantly higher than the pressure in the canister C (for example, 20 kPa or more). Then, the evaporated fuel in the fuel tank T is introduced toward the canister C. Thereby, the 1st relief valve 4 comprises the normal direction relief valve of a non-return valve structure.

The first relief valve 4 is seated on and removed from the first valve seat of the valve seat 8 to close and open the first valve hole 61, and the bottomed cylindrical first valve 62 and the first valve 62 include A return spring (first spring) 63 that is urged by a predetermined urging force is formed on the side (the valve closing direction) on which the first valve seat is seated.
The first valve 62 can slide back and forth on the inner surface of the first valve guide 55. Further, the first valve 62 has a synthetic rubber attached to the surface of the disk-shaped seal portion seated on the first valve seat of the valve seat 8.
The inner diameter portion of the return spring 63 is supported by a cylindrical spring guide 64 that protrudes from the inner surface of the cover 6 toward the space 27.
The valve opening pressure of the first relief valve 4 is determined by the set load of the return spring 63 and the like.

The 2nd relief valve 5 is accommodated in the space 26 so that a reciprocation is possible. The second relief valve 5 is lifted to open the second valve hole 65 when the pressure in the fuel tank T is significantly lower than the pressure in the canister C (for example, 15 kPa or more). The pressure on the canister C side is sent into the fuel tank T. Thereby, the 2nd relief valve 5 comprises the reverse direction relief valve of a non-return valve structure.
In addition, the value of these pressure differences at which the forward direction relief valve and the backward direction relief valve perform the opening operation is not limited to this.

The second relief valve 5 is seated on the second valve seat of the valve seat 8 and separated from the second valve hole 65 to close and open the second valve hole 65, and the second valve 66 includes A return spring (second spring) 67 urged by a predetermined urging force is formed on the side (valve closing direction) seated on the second valve seat.
The second valve 66 can slide back and forth on the inner surface of the second valve guide 56. In addition, the second valve 66 has synthetic rubber attached to the surface of the disk-shaped seal portion that is seated on the second valve seat of the valve seat 8.
The valve opening pressure of the second relief valve 5 is determined by the set load of the return spring 67 and the like. Further, the inner diameter portion of the return spring 67 may be supported by a cylindrical spring guide protruding from the end surface of the case 7 toward the space 26.

[Features of Example 1]
Next, details of the resin welded body 2 of the present embodiment will be described with reference to FIGS.
The resin welded body 2 includes a cover 6 and a case 7.
The cover 6 is integrally formed of a laser transmissive resin material having a laser beam permeability. The type of the laser transmissive resin material is not particularly limited as long as it has thermoplasticity and has a predetermined transmittance with respect to laser light. For example, polyamide (PA), polyethylene (PE), polypropylene (PP), polycarbonate (PC), polyoxymethylene (POM), acrylonitrile butadiene styrene (ABS), polybutylene terephthalate (PBT), polyphenylene sulfide (PPS) ), Acrylic (PMME), syndiotactic polystyrene (SPS), and other resin materials can be used. Further, a colorant may be mixed as long as a predetermined transmittance can be ensured.

The case 7 is integrally formed of a laser-absorbing resin material having laser light absorbability. The type of the laser-absorbing resin material is not particularly limited as long as it has thermoplasticity and can absorb without transmitting the laser beam. Basically, the resin materials exemplified above can be used.
In addition, you may add reinforcement fibers, such as glass fiber and a carbon fiber, to a laser permeable resin material and a laser absorptive resin material as needed. Moreover, about the combination of a laser transparent resin material and a laser absorptive resin material, the combination of mutually compatible things can be suitable. As such a combination, in addition to a combination of the same kind of resins, a combination of different kinds of resins is also possible.

  The cover 6 constitutes a ceiling-like upper case that is closed at one end and opened at the other end. An annular flange 11 extending from the opening periphery to the outside is provided on the opening periphery of the cover 6. The cover 6 has a cylindrical projecting wall 71 extending from the base end of the flange 11 toward the valve seat 8 side. The protruding wall 71 is in contact with the valve seat 8.

In addition, a plurality of fitting pins (not shown) extend from the facing surface facing the valve seat 8 toward the valve seat 8 on the flange 11.
Further, the upper surface and the joining surface of the flange 11 of the cover 6 are formed in a planar shape over the entire circumference. Further, in the flange 12 of the case 7, the joint surfaces other than the protruding ribs 13 are formed in a planar shape over the entire circumference.
On the other hand, the valve seat 8 has a plurality of fitting holes (not shown) through which a plurality of fitting pins penetrate.
The front end portions of the plurality of fitting pins in the axial direction penetrate the respective fitting holes and protrude from the lower surface of the valve seat 8 (opposite side surface facing the cover 6), and then are crushed by heat caulking or the like. It is. Thereby, the valve seat 8 is fixed to the cover 6.
A plurality of fitting pins and a plurality of fitting holes may not be provided.

  The case 7 constitutes a bottomed cylindrical lower case that is open at one end and closed at the other end. The case 7 is provided with a cylindrical outer wall (peripheral wall) 72 that surrounds the protruding wall 71 of the cover 6, the valve seat 8 and the packing 9 in the circumferential direction. An annular flange 12 extending outward from the periphery of the opening is provided on the periphery of the opening of the outer wall 72. On the joint surface of the flange 12, an annular ridge rib 13 that abuts on the flange 11 of the cover 6 is provided.

The ridge rib 13 is a ridge portion having a triangular cross section and protruding from the joint surface (surface) of the flange 12 toward the flange 11 of the cover 6. Further, the protruding ribs 13 are continuously provided in an annular shape along an annular welding planned portion (scanning paths of a plurality of laser beams: L1, L2) between the cover 6 and the case 7.
An annular portion 73 that is in surface contact with the valve seat 8 is provided at the tip of the protruding wall 71 of the cover 6. Further, the valve seat 8 is provided with an annular portion 74 having an annular ring groove for accommodating the packing 9. Thereby, since the packing 9 is interposed between the annular portion 73 of the case 7 and the annular portion 74 of the valve seat 8, it is possible to prevent leakage of the evaporated fuel from the inside to the outside of the blocking valve unit 1. .

[Method for Producing Resin Welded Body of Example 1]
Next, a laser welding method (a method for manufacturing a resin welded body) of the resin welded body according to this embodiment will be briefly described with reference to FIGS. Here, FIG. 3 shows a plurality of laser irradiation apparatuses that simultaneously irradiate the annular welding planned portion between the flange 11 of the cover 6 and the flange 12 of the case 7 with laser light.
Note that at least the rib ribs 13 are simultaneously irradiated with a plurality of laser beams to the annular welding planned portion between the cover 6 and the case 7, so that a plurality of laser beams are scanned along the scanning paths (L 1, L 2). The welding part 14 is formed continuously in an annular shape.

  The plurality of laser beam irradiation apparatuses include a plurality of laser oscillators 81 and 82 and a plurality of laser irradiation heads 83 and 84 that simultaneously irradiate the annular welding scheduled portion with a plurality of laser beams emitted simultaneously from the laser oscillators 81 and 82. A plurality of laser transmission means (optical fibers) 85 and 86 for transmitting a plurality of laser beams emitted from the plurality of laser oscillators 81 and 82 to the plurality of laser irradiation heads 83 and 84, respectively, and the flange 11 of the cover 6 A plurality of pressing jigs 91 and 92 for pressing (or pressing) the flange 7 of the case 7 to the joint surface side, and a laser irradiation position at which the annular welding scheduled portion is irradiated simultaneously from the plurality of laser irradiation heads 83 and 84 Irradiation position moving means (not shown) for movement is provided.

The plurality of laser oscillators 81 and 82 are laser light sources that generate laser light. As these laser oscillators 81 and 82, semiconductor lasers having a laser output of about 700 to 900 W are used.
The plurality of laser irradiation heads 83 and 84 are first and second irradiation units each equipped with a plurality of or a single condensing lens for condensing laser light. These laser irradiation heads 83 and 84 have scanning paths (L 1 and L 2) of the plurality of laser beams on the flange 11 of the cover 6 so that at least the plurality of laser beams are simultaneously irradiated onto the ribs 13. Is set. The moving speed of the plurality of laser irradiation heads 83 and 84 is set to about 10 mm / sec.
The scanning paths (L1, L2) of the plurality of laser beams may be the same scanning path for the plurality of laser beams, or may be offset within a predetermined range.

The plurality of laser beams are scanned so as to go around each scanning path (L1, L2) of the plurality of laser beams at least half a circumference while maintaining a predetermined distance from each other.
The laser irradiation positions of the plurality of laser beams are moved so as to follow the pressure positions by the plurality of pressing jigs 91 and 92 by the operation (control) of the irradiation position moving means.
Each laser irradiation position of the plurality of laser beams includes an irradiation start position (S1, S2) for starting laser irradiation on the annular welding scheduled portion and an irradiation end position (E1) for ending laser irradiation on the annular welding scheduled portion. , E2).

The irradiation start position (S1, S2) is set for each substantially equal scanning distance obtained by dividing each scanning path (L1, L2) of a plurality of laser beams by a division number (2) corresponding to the number (number) of laser beams. Is set. In the present embodiment, the irradiation start position (S1, S2) is set to a position that is shifted approximately half a circumference in the annular welding scheduled portion.
Irradiation end positions (E1, E2) are obtained at substantially equal scanning distances obtained by dividing each scanning path (L1, L2) of a plurality of laser beams by a division number (2) corresponding to the number (number) of laser beams. Is set. In the present embodiment, the irradiation end position (E1, E2) is set to a position that is shifted substantially half a circumference in the annular welding scheduled portion.

The irradiation end position (E1) of one of the plurality of laser beams is set in the vicinity of the irradiation start position (S1) of the first laser beam.
The irradiation end position (E2) of the other second laser light among the plurality of laser lights is set in the vicinity of the irradiation start position (S2) of the second laser light.
Each position and each scanning path (L1, L2) are stored and held in advance in a storage unit of a control device that controls the irradiation position moving unit.

The plurality of holding jigs 91 and 92 are configured so that a predetermined jig pressing range on the surface (upper surface) of the flange 11 of the cover 6 is applied to the contact surface of the flange 11 of the cover 6 and the protruding rib 13 of the case 7. It is the 1st, 2nd pressurizing part which pressurizes to the side to contact. These holding jigs 91 and 92 cover the surface of the flange 11 of the cover 6 in the vicinity of each irradiation position of a plurality of laser beams irradiated simultaneously to a plurality of locations (A1, A2) in the annular welding scheduled portion. Pressurize.
The plurality of pressing jigs 91 and 92 apply a load in a direction in which the flange 11 of the cover 6 is pressed against the flange 12 of the case 7.
Note that the plurality of holding jigs 91 and 92 are movable along the annular welding scheduled portion, similarly to the plurality of laser irradiation heads 83 and 84.
Further, the irradiation width of the plurality of laser beams has a width wider than the pressing width of the plurality of pressing jigs 91 and 92.

Next, the laser welding process of the resin welded body 2 of a present Example is demonstrated based on FIG. 5 and FIG.
In the laser welding process, the flange 11 of the cover 6 is superposed on the flange 12 of the case 7. Next, a plurality of welding locations (A1, A2) in the annular welding scheduled portion between the cover 6 and the case 7 and at least the protruding ribs 13 are formed by using laser beams irradiated simultaneously from the plurality of laser irradiation heads 83 and 84. The process of forming the welding part 14 for every some welding location (A1, A2) by carrying out laser welding of the some welding location (A1, A2) simultaneously by making it heat-melt simultaneously. Next, each welding position of the plurality of laser beams is moved along the respective scanning paths (L1, L2) of the plurality of laser beams with respect to the annular welding planned portion, so that the welding portion 14 is continuously annularly formed. The process connected to is implemented.

Here, the valve seat 8 is assembled to the cover 6 in advance before it is assembled to the case 7. The first relief valve 4 is incorporated in a space 27 formed between the cover 6 and the valve seat 8.
In addition, the solenoid assembly excluding the case 7 is assembled and integrated with the case 7 in advance before the cover 7 is assembled. A second relief valve 5 is incorporated in a space 26 formed between the case 7 and the valve seat 8. A packing 9 is sandwiched between the annular portion 73 of the cover 6 and the annular portion 74 of the valve seat 8.
In the present embodiment, the joint between the flange 11 of the cover 6 and the flange 12 of the case 7 is welded with the valve seat 8 and the packing 9 sandwiched between the cover 6 and the case 7.

Specifically, first, as shown in FIG. 4A, the tip of the rib rib 13 having a triangular cross-section projecting from the joint surface of the flange 12 of the case 7 made of thermoplastic resin having laser beam absorbability. The flange 11 of the cover 6 and the flange 12 of the case 7 are overlapped so that the joint surface of the flange 11 of the thermoplastic resin cover 6 having a laser beam permeability is in line (or surface) contact with the (tip). Combine (first step).
At this time, with the joining surface of the flange 11 and the joining surface of the flange 12 facing each other with a gap corresponding to the height of the projecting rib 13, the tip of the projecting rib 13 protruding from the joining surface of the case 7 (pointed end) ) Abuts (contacts) the joint surface of the cover 6.

Next, as shown in FIG. 4B and FIG. 5, a plurality of laser beams (B1, B2) are applied to a plurality of welding locations (A1, A2) in the annular welding planned portion between the cover 6 and the case 7. Are simultaneously pressed by a plurality of pressing jigs 91 and 92, respectively, in the vicinity of each laser irradiation position of a plurality of laser beams (second step).
At this time, the jig pressurizing range to be pressed by the plurality of holding jigs 91 and 92 is narrower than the respective irradiation widths of the plurality of laser beams and outside the flange 11 of the cover 6 (outer peripheral edge side). . In addition, each pressing position by the plurality of holding jigs 91 and 92 is set in front of the traveling direction of each scanning path (L1, L2) of the plurality of laser beams with respect to each laser irradiation position of the plurality of laser beams. Keep it.

Next, as shown in FIGS. 4B and 5, a plurality of laser beams (B 1, B 2) are simultaneously irradiated to a plurality of locations (A 1, A 2) in the annular welding scheduled portion through the flange 11 of the cover 6. Thus, at least the protrusion ribs 13 are melted, thereby forming the welded portions 14 at a plurality of locations (A1, A2) in the annular welded planned portion (third step).
Next, as shown in FIG. 4C, FIG. 5, and FIG. 6, each laser irradiation position of a plurality of laser beams so as to drive each jig pressing position by the plurality of pressing jigs 91 and 92. Is moved relative to the annular welding planned portion between the cover 6 and the case 7 along the scanning paths (L1, L2) of the plurality of laser beams (fourth step).

  Specifically, the plurality of laser beams emitted from the plurality of laser oscillators 81 and 82 are guided to the respective condensing lenses of the plurality of laser irradiation heads 83 and 84 through the plurality of optical fibers 85 and 86, and the respective condensing lenses are used. From the upper side of the flange 11 of the cover 6, the plurality of focused laser beams (B1, B2) are applied to a plurality of welding locations (A1, A2) (= locations corresponding to the irradiation start positions (S1, S2)). Irradiate each simultaneously. At this time, the irradiation direction of the plurality of laser beams (B 1, B 2) is substantially perpendicular to the plane direction of the flange 11 of the cover 6.

Then, as shown in FIGS. 5 and 6, the plurality of pressing jigs 91, 92 are moved along the annular welding scheduled portion, and each jig pressing position by the plurality of pressing jigs 91, 92 is further moved. The first and second laser beams (B1) are applied to the plurality of welding locations (A1, A2) while moving the plurality of laser irradiation heads 83, 84 horizontally and along the annular welding scheduled portion. , B2) are simultaneously irradiated.
Then, the pair of first and second laser beams (B1, B2) pass through the flange 11 of the cover 6 and simultaneously reach the welding locations (A1, A2) of the flange 12 of the case 7.

When the pair of first and second laser beams (B1, B2) are absorbed by the welded portions (A1, A2: in particular, the rib ribs 13) of the flange 12 of the case 7, the welded portions (A1, A2) of the flange 12 are absorbed. Is heated and softened, and the ribs 13 are melted.
Since the rib rib 13 of the case 7 is in pressure contact with the flange 11 of the cover 6, the heat of the rib rib 13 is also transmitted to the welding location (A 1, A 2) of the flange 11 of the cover 6.
Accordingly, the welded portions (A1, A2) of the cover 6 are also softened and the protruding ribs 13 are eliminated, so that the welded locations (A1, A2) of the flange 11 and the welded locations (A1, A2) of the flange 12 are contacted. An area | region increases and both welding locations (A1, A2) will be in a molten state.

And with the movement of each laser irradiation position of a several laser beam, the temperature of both fusion | melting locations falls and it solidifies.
The pair of first and second laser beams (B1, B2) are scanned from the irradiation start position (S1, S2) to the irradiation end position (E1, E2), so that the ring 6 is welded between the cover 6 and the case 7. Since the welding part 14 formed for each welding location (A1, A2) in the planned part is continuously connected in an annular shape, the flange 11 of the cover 6 and the flange 12 of the case 7 are continuously welded in an airtight manner. The resin welded body 2 including the annular welded portion 14 between the cover 6 and the case 7 can be manufactured.

  By the way, after one first laser beam (B1) of the pair of first and second laser beams (B1, B2) is irradiated to the specific portion (A1) in the annular welding scheduled portion through the flange 11 of the cover 6. When moving to the front side in the traveling direction of the scanning path (L1) of the first laser light, the rib ribs 13 and the melted portions of both are once melted and then solidified. At this time, as shown in FIG. 4 (b), the rib rib 13 is pressed by the holding jig 91, so that the height is reduced to about half of the initial height.

  Thereafter, the other second laser beam (B2) of the pair of first and second laser beams (B1, B2) moves to the front side in the traveling direction of the scanning path (L2) of the second laser beam. When reaching the specific part (A1) or the vicinity thereof and irradiating the specific part (A1) or the vicinity thereof, the rib ribs 13 and the melting points of both are melted again. At this time, as shown in FIG. 4 (c), the protrusion rib 13 is further lowered in height, and finally disappears, and the joint surface of the flange 11 of the cover 6 and the joint surface of the flange 12 of the case 7. And the welded portion 14 are formed between the cover 6 and the case 7.

  In addition, after the other second laser beam (B2) is irradiated to the specific portion (B1) in the annular welding scheduled portion through the flange 11 of the cover 6, the front side in the traveling direction of the scanning path (L2) of the second laser beam. If it moves to, like the above, the rib ribs 13 and the melting portions of both are once melted and then solidified. At this time, as shown in FIG. 4B, the rib ribs 13 are pressed by the holding jig 92, so that the height is reduced to about half of the initial height as described above. .

  Thereafter, one of the first laser beams (B1) moves to the front side in the traveling direction of the scanning path (L1) of the first laser beams, reaches the specific location (B1) or the vicinity thereof, and When the specific portion (B1) or the vicinity thereof is irradiated, the rib ribs 13 and the melting portions of both are melted again in the same manner as described above. At this time, as shown in FIG. 4 (c), the protrusion rib 13 is further lowered in height, and finally disappears, and the joint surface of the flange 11 of the cover 6 and the joint surface of the flange 12 of the case 7. As shown above, a welded portion 14 is formed between the cover 6 and the case 7.

[Effect of Example 1]
As described above, in the laser welding method of the resin welded body 2 according to the present embodiment, a plurality of welding locations (A1) in the annular welding scheduled portion between the cover 6 and the case 7 through the flange 11 of the cover 6 through a plurality of laser beams. , A2) is simultaneously irradiated to melt at least the rib ribs 13 and form the rib ribs 13 for each of the plurality of welding locations (A1, A2) in the annular welding scheduled portion. And each welding position of a some laser beam is moved relatively with respect to a cyclic | annular welding plan part along each scanning path | route (L1, L2) of a some laser beam, and the welding part 14 is cyclic | annular. It is formed continuously.

  Accordingly, a plurality of laser beams are simultaneously irradiated to the annular welding planned portion between the cover 6 and the case 7 to melt at least the rib ribs 13, so that a plurality of the annular welding planned portions between the cover 6 and the case 7 are provided. These welding locations (A1, A2) can be welded simultaneously. Moreover, the welding part 14 formed for every welding location (A1, A2) in the cyclic | annular welding plan part of the cover 6 and the case 7 is connected cyclically | annularly. Thereby, a clearance gap is not formed in the cyclic | annular welding plan part of the cover 6 and the case 7, and the welding defect in a cyclic | annular welding plan part can be prevented. Further, the airtightness between the cover 6 and the case 7 can be maintained.

  In addition, since the resin welded body 2 having the annular welded portion 14 is manufactured using a plurality of laser irradiation apparatuses, compared to the case where a conventional single laser irradiation apparatus is used, the annular welding is planned. A plurality of welding locations (A1, A2) in the part can be welded simultaneously. Thereby, if it is the same moving speed as the conventional laser irradiation apparatus, the welding operation time can be reduced to about half. The welding operation time is shortened as the number of laser beams is increased.

  Further, as compared with a conventional laser irradiation apparatus that scans around the laser beam scanning path by about two laps, the laser beam scan path (L1, L2) has one lap around. In the case of the laser irradiation apparatus of Example 1 that is scanned so as to circulate only once, the movement distance (scanning distance) of one laser irradiation apparatus can be shortened to about half that of the conventional laser irradiation apparatus, and If the moving speed is the same as that of the laser irradiation apparatus, the welding operation time can be shortened to about half. The welding operation time is shortened as the number of laser beams is increased.

  Here, as described above, even when the flange 11 of the cover 6 is thin, a single laser irradiation is performed as shown in FIGS. 7 and 8 for the purpose of preventing the occurrence of cracks in the flange 11. A method (Comparative Example 1) in which the flange 11 of the cover 6 and the flange 12 of the case 7 are laser-welded by means of an apparatus was manufactured.

In the laser welding method of Comparative Example 1, the cover 6 and the case 7 are placed so that the joint surface of the flange 11 of the cover 6 is in surface contact with the tip of the rib rib 13 protruding from the joint surface of the flange 12 of the case 7. While applying pressure to the flange 11 of the cover 6 with an overlapping and holding jig (not shown), a laser beam is irradiated from the single laser irradiation device through the flange 11 of the cover 6 to heat and melt at least the rib ribs 13. By doing so, the welding part 14 is formed for every laser irradiation position.
Then, the laser irradiation position is moved so as to drive the jig pressurizing position by the holding jig, that is, the single laser beam is scanned along the annular welding scheduled portion, thereby continuously welding the welding portion 14. Form.

However, in the laser welding method using a single laser irradiation apparatus, irradiation is performed from the irradiation start position (S) of the laser beam for the purpose of welding the entire periphery or a plurality of locations of the bonding surface of the cover 6 and the bonding surface of the case 7. When the annular welding planned part is welded while moving the irradiation position of the laser beam in order toward the end position (E), there are a welded part (welded part 14) and an unwelded part. As shown in FIG. 7, there is a problem that the cover 6 or the case 7 is inclined and the cover 6 or the case 7 is distorted.
In FIG. 7A, the cover 6 or the case 7 is distorted, so that the valve seat surface of the valve seat 8 is deflected with respect to the two-dot chain line (regular position) in the drawing. The state in which is occurring is shown.

  Further, by melting the protrusion ribs 13 in order with the movement of the laser irradiation position, the cover 6 is laser welded while being deformed during the welding process. That is, at the welding location irradiated with a single laser beam, as shown on the right side of FIG. 7B, the amount of welding melt is large and the welding allowance is reduced, whereas the laser beam is still irradiated. In an unwelded part, as shown on the left side of FIG. 7B, the welding amount is zero, the welding allowance is not reduced, the cover 6 is tilted, and the deformation of the cover 6 is caused by other parts ( For example, it extends to the valve seat 8 and the packing 9).

  Further, when the welded portion 14 has a structure close to other parts (for example, the valve seat 8 and the packing 9), the deformation of the cover 6 generated in the laser welding process causes the other parts (for example, the valve seat 8 and the packing 9) to be deformed. Will also be deformed. For example, when the valve seat surface of the valve seat 8 is distorted or the valve seat 8 is tilted, the product function as the block valve unit 1 is affected.

  Accordingly, for example, the first valve 62 of the first relief valve 4 cannot be seated (seat) on the first valve seat (valve seat surface) of the valve seat 8, or the second valve 66 of the second relief valve 5 is not seated on the valve seat 8. Cannot seat (seat) on the second valve seat (valve seat surface). As a result, even if a malfunction such as a seal failure (airtight failure) between the spaces 26 and 27 that are hermetically partitioned by the valve seat 8 occurs, the fuel tank T can be surely secured even if the electromagnetic sealing valve 3 can be closed. There is a problem that it becomes impossible to seal.

  On the other hand, in the laser welding method of the resin welded body 2 of the present embodiment, since the laser welding is performed using a plurality of laser irradiation apparatuses, the cover 6 or the case 7 and the valve seat 8 are inclined. In addition, the occurrence of problems such as distortion of the cover 6 or the case 7 and the valve seat 8 can be suppressed, and other components (the valve seat 8 and the packing 9) disposed in the vicinity of the welded portion 14 as described above. It does not affect the product function.

By the way, in the laser welding process of the resin welded body 2, as described above, if the joint surface of the flange 11 of the cover 6 and the joint surface of the flange 12 of the case 7 are not in reliable contact, a problem of causing a joint failure. There is.
Therefore, since the pressing jig is used to press the cover 6 toward the case 7, when the entire circumference of the joint surface of the flange 11 of the cover 6 is pressed by one pressing jig, the pressing jig is It becomes impossible to irradiate a plurality of laser beams on the welded portions (A 1, A 2) of the flange 12 of the case 7 through the flange 11 of the cover 6.
Therefore, when the entire circumference of the joint surface of the flange 11 of the cover 6 is pressed by a single pressing jig, a material having a laser beam permeability (for example, glass) is used for the pressing jig. The cover 6 and the case 7 are welded by passing the laser beam through the jig.

[Modification]
In the present embodiment, the number of rotations of the scanning trajectories of the plurality of laser beams is set to be not less than one half and less than one, but the number of rotations of the scanning trajectories of the plurality of laser beams is one or more times (for example, 1 to 3 times). It may be set to. In this case, the scanning trajectories of the plurality of laser beams may follow the same trajectory every round, or may be gradually shifted outward or inward.

  In this embodiment, scanning is performed so that each of the scanning paths (L1, L2) of the pair of laser beams circulates at least half a circle or more, but a plurality (3, 4, 5,... N or more) is scanned. You may scan so that it may each circulate on each scanning path | route (L1, L2) of a laser beam at least 1/3 round, 1/4 round, 1/5 round ... 1 / N round.

In this embodiment, the irradiation end positions (E1, E2) of the plurality of laser beams are set to positions before (immediately before) the respective irradiation start positions (S1, S2) of the plurality of laser beams. Each irradiation end position (E1, E2) of the plurality of laser beams may be set to a position overlapping with each irradiation start position (S1, S2) of the plurality of laser beams.
Moreover, you may set each irradiation end position (E1, E2) of a some laser beam to the position which passed each irradiation start position (S1, S2) of a some laser beam.

Laser light sources such as YAG laser, CO ₂ laser, glass / neodium laser, ruby laser, helium / neon laser, krypton laser, argon laser, hydrogen laser, nitrogen laser are used in addition to the semiconductor laser. It is possible.

  As a method of irradiating a plurality of laser beams, a plurality of laser beams emitted from each laser light source (laser oscillator) of a plurality of laser irradiation devices are condensed by a condensing lens of each laser irradiation unit (laser irradiation head). Of laser beam from the laser irradiation part of the laser to obtain the welded part by simultaneously irradiating the annular welded part of the transmitting material and the absorbing material, and laser emitted from each laser light source (laser oscillator) of a single laser irradiation device There is a method in which light is split at a branching portion and transmitted to a plurality of laser irradiation portions, and laser light is simultaneously irradiated from these laser irradiation portions to the annular welding planned portion of the transmitting material and the absorbing material to obtain a welding portion. .

As a method of scanning a plurality of laser beams, a plurality of irradiating unit driving devices are used so that the transmitting material and the absorbing material are placed on a fixed table in a state of being overlapped, and each pressing position of the plurality of pressing units is driven. For example, a method of driving the laser irradiation section (laser irradiation head) in the X direction and the Y direction, and a table on which a plurality of laser irradiation sections are fixed and the transmitting material and the absorbing material are superposed are placed, for example, X And driving in the Y direction.
In addition, the irradiation direction from the plurality of laser irradiation heads 83 and 84 to the annular welding scheduled portion is a direction inclined by a predetermined inclination angle even if the irradiation direction is perpendicular to the upper surface (plane) of the flange 11 of the cover 6. It does not matter.

In addition, when a laser beam transmitting material (for example, glass) is used for the holding jig, a jig pressing position by a plurality or a single holding jig, and a laser irradiation position of a plurality of laser lights, May overlap. Then, the jig pressing position by a plurality of or a single pressing jig may be moved in synchronization with the movement of the laser irradiation positions of the plurality of laser beams.
Further, the laser irradiation positions of a plurality of laser beams may be moved in synchronization with a jig pressing position by a plurality or a single holding jig.
In the case of a single pressing jig capable of pressing (pressing) the annular jig pressing range, it is not necessary to move the pressing jig.

In this embodiment, the cover 6 made of a laser transmissive resin material is employed as a transmissive material that transmits laser light. However, a material other than a resin material such as transparent glass may be employed as the transmissive material. .
In this embodiment, the case 7 made of a laser-absorbing resin material is used as an absorbing material that absorbs laser light, but a material other than a resin material such as opaque glass, metal or ceramics is used as the absorbing material. You may do it.

Also, as an absorbing material that absorbs laser light, a hollow portion (space) that accommodates a component, a cylindrical side wall that surrounds the periphery of the space in the circumferential direction, and an opening that opens at one end of the side wall A cylindrical housing may be used.
Further, as a transmitting material that transmits laser light, a cover that has a peripheral portion that is laser-welded to the peripheral edge of the opening of the side wall of the housing and that hermetically or liquid-tightly seals the opening may be used.

In this embodiment, the laser welding method of the welded body according to the present invention is performed by joining the opening peripheral portion (first flange 11) of the dome-shaped (container-shaped) cover 6 having the first opening or the first hollow portion. The resin welded body 2 is manufactured by laser welding the surface and the joint surface of the opening peripheral portion (second flange 12) of the bottomed cylindrical (container-like) case 7 having the second opening or the second hollow portion. Although the laser welding method of the present invention is applied to the laser welding method, the bottomed cylindrical (container-like) shape having the joining surface of the peripheral edge of the flat cover and the opening or the hollow portion is used. You may apply to the laser welding method which manufactures a welding body by laser-welding the joining surface of the opening peripheral part of a case.
Moreover, you may apply to the laser welding method which manufactures a welding body by laser-welding the joining surface of the peripheral part of a flat transmission material, and the joining surface of the peripheral part of a flat absorbent material.

DESCRIPTION OF SYMBOLS 1 Sealing valve unit 2 Resin welding body 3 Electromagnetic sealing valve 4 1st relief valve 5 2nd relief valve 6 Cover (permeable material)
7 Case (absorbent)
11 Cover flange (welding location)
12 Case flange (welded location)
13 ridge rib (ridge)
14 Welding part

Claims (13)

(A) First, the joining surface of the transmitting material (6, 11) that transmits the laser light contacts the tip of the ridge (13) protruding from the joining surface of the absorbing material (7, 12) that absorbs the laser light. So as to superimpose the transmitting material (6, 11) and the absorbing material (7, 12),
(B) Next, a plurality of laser beams irradiated simultaneously to a plurality of locations (A1, A2) in the annular welding scheduled portion of the transmitting material (6, 11) and the absorbing material (7, 12). Pressurizing the vicinity of each irradiation position (S1, S2, E1, E2) with a plurality of or a single pressurizing unit (91, 92), respectively;
(C) Next, the plurality of laser beams (B1, B2) are simultaneously irradiated through the transmitting material (6, 11) to a plurality of locations (A1, A2) in the annular welding planned portion, so that at least the protrusions ( 13) melting a step of forming a welded portion (14) for each of a plurality of locations (A1, A2) in the annular welded planned portion;
(D) Next, the irradiation positions (S1, S2, E1, E2) of the plurality of laser beams are placed on the annular welding planned portion along the scanning paths (L1, L2) of the plurality of laser beams. And a step of continuously forming the welded portion (14) in an annular shape by relatively moving the welded portion (14). In the laser welding method of the welded body according to claim 1,
Each scanning path (L1, L2) of the plurality of laser beams is
Laser welding method of welded body characterized in that it is set corresponding to the annular welding scheduled portion so that at least the plurality of laser beams (B1, B2) are simultaneously irradiated onto the protrusion (13) . In the laser welding method of the welded body according to claim 1 or 2,
The protrusion (13) protrudes from the bonding surface of the absorbent material (7, 12) toward the bonding surface of the transmission material (6, 11) and continues in an annular shape along the annular welding planned portion. A method of laser welding a welded body, characterized by being provided. In the laser welding method of the welded body according to any one of claims 1 to 3,
Each pressure position by the plurality of pressure units (91, 92) is:
It is set in front of the traveling directions of the scanning paths (L1, L2) of the plurality of laser beams from the irradiation positions (S1, S2, E1, E2) of the plurality of laser beams. Laser welding method of the welded body. In the laser welding method of the welded body according to any one of claims 1 to 4,
The plurality of laser beams (B1, B2)
A method of laser welding a welded body, characterized in that scanning is performed so as to make at least a half turn around each scanning path (L1, L2) of the plurality of laser beams while maintaining a predetermined distance from each other. In the laser welding method of the welded body according to any one of claims 1 to 5,
Each irradiation position (S1, S2, E1, E2) of the plurality of laser beams is
2. A laser welding method for a welded body, wherein the plurality of pressurizing portions (91, 92) move so as to drive each pressurizing position. In the laser welding method of the welded body according to any one of claims 1 to 6,
Each irradiation position of the plurality of laser beams is
It has an irradiation start position (S1, S2) for starting laser irradiation with respect to the annular welding scheduled portion,
The irradiation start position (S1, S2) is set at a different position for each of the plurality of laser beams (B1, B2). In the laser welding method of the welded body according to claim 7,
The irradiation start position (S1, S2) is obtained by dividing each scanning path (L1, L2) of the plurality of laser beams (B1, B2) by the number of divisions corresponding to the number of the laser beams (B1, B2). A method of laser welding a welded body, characterized in that it is set for each substantially equal scanning distance. In the laser welding method of the welded body according to claim 7 or 8,
Each irradiation position of the plurality of laser beams is
Having an irradiation end position (E1, E2) for ending the laser irradiation with respect to the annular welding scheduled portion,
The irradiation end position (E1, E2) is set at a different position for each of the plurality of laser beams (B1, B2). In the laser welding method of the welded body according to claim 9,
The irradiation end positions (E1, E2) are substantially equal scanning distances obtained by dividing the scanning paths (L1, L2) of the plurality of laser beams by the number of divisions corresponding to the number of the laser beams (B1, B2). Laser welding method for welded body, characterized in that it is set for each. In the laser welding method of the welded body according to claim 9 or 10,
The irradiation end position (E1, E2) of at least one laser beam (B1, B2) of the plurality of laser beams (B1, B2) is:
A laser welding method for a welded body, which is set in the vicinity of an irradiation start position (S1, S2) of the at least one laser beam (B1, B2). In the laser welding method of the welded body according to any one of claims 1 to 11,
The said pressurization part (91, 92) makes the predetermined pressurization range in the said permeable material (6, 11), the said permeable material (6, 11) or the said absorber (7, 12), and the said protrusion ( 13) A method for laser welding a welded body, wherein pressure is applied to the side in contact with the welded body. In the laser welding method of the welded body according to any one of claims 1 to 13,
The transmitting material is a laser transmitting resin material (6, 11) having a laser beam transmitting property,
The absorbing material is a laser-absorbing resin material (7, 12) having a laser-absorbing property,
By welding the laser transmissive resin material (6, 11) and the laser absorbing resin material (7, 12), the welded part (2) in which the welded part (14) is continuously formed in an annular shape. A method of laser welding a welded body characterized in that:

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