JP2012024987A - Resin welding method - Google Patents

Resin welding method Download PDF

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Publication number
JP2012024987A
JP2012024987A JP2010164198A JP2010164198A JP2012024987A JP 2012024987 A JP2012024987 A JP 2012024987A JP 2010164198 A JP2010164198 A JP 2010164198A JP 2010164198 A JP2010164198 A JP 2010164198A JP 2012024987 A JP2012024987 A JP 2012024987A
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JP
Japan
Prior art keywords
resin
welding
region
resin member
laser beam
Prior art date
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Granted
Application number
JP2010164198A
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Japanese (ja)
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JP5588253B2 (en
Inventor
Takenori Omiya
丈典 大宮
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Hamamatsu Photonics KK
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Hamamatsu Photonics KK
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Priority to JP2010164198A priority Critical patent/JP5588253B2/en
Publication of JP2012024987A publication Critical patent/JP2012024987A/en
Application granted granted Critical
Publication of JP5588253B2 publication Critical patent/JP5588253B2/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/349—Cooling the welding zone on the welding spot
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1654—Laser beams characterised by the way of heating the interface scanning at least one of the parts to be joined
    • B29C65/1661—Laser beams characterised by the way of heating the interface scanning at least one of the parts to be joined scanning repeatedly, e.g. quasi-simultaneous laser welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1222—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a lapped joint-segment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1224—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a butt joint-segment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/242—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours
    • B29C66/2424—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being a closed polygonal chain
    • B29C66/24243—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being a closed polygonal chain forming a quadrilateral
    • B29C66/24244—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being closed, i.e. forming closed contours being a closed polygonal chain forming a quadrilateral forming a rectangle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B29C66/5346—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat
    • B29C66/53461—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat joining substantially flat covers and/or substantially flat bottoms to open ends of container bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/61—Joining from or joining on the inside
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/65—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles with a relative motion between the article and the welding tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
    • B29C66/7377—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined amorphous, semi-crystalline or crystalline
    • B29C66/73773—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined amorphous, semi-crystalline or crystalline the to-be-joined area of at least one of the parts to be joined being semi-crystalline
    • B29C66/73774—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined amorphous, semi-crystalline or crystalline the to-be-joined area of at least one of the parts to be joined being semi-crystalline the to-be-joined areas of both parts to be joined being semi-crystalline
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8181—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/836—Moving relative to and tangentially to the parts to be joined, e.g. transversely to the displacement of the parts to be joined, e.g. using a X-Y table
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91411—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the parts to be joined, e.g. the joining process taking the temperature of the parts to be joined into account
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
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    • B29C66/91441—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature the temperature being non-constant over time
    • B29C66/91443—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature the temperature being non-constant over time following a temperature-time profile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
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    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91641—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time
    • B29C66/91643—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time following a heat-time profile
    • B29C66/91645—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time following a heat-time profile by steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/91921—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature
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    • B29C66/91921—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature
    • B29C66/91931—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature in explicit relation to the fusion temperature or melting point of the material of one of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
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    • B29C66/919—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges
    • B29C66/9192—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams
    • B29C66/91951—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux characterised by specific temperature, heat or thermal flux values or ranges in explicit relation to another variable, e.g. temperature diagrams in explicit relation to time, e.g. temperature-time diagrams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/001—Joining in special atmospheres
    • B29C66/0012—Joining in special atmospheres characterised by the type of environment
    • B29C66/0014—Gaseous environments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/731—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the intensive physical properties of the material of the parts to be joined
    • B29C66/7311—Thermal properties
    • B29C66/73115—Melting point

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Toxicology (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Plasma & Fusion (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a resin welding method which enables sure weld of resin members to each other while preventing damage due to excess heat input in a region scheduled for welding from occurring.SOLUTION: When welding a resin member 3 with a resin member 4, these resin members are made to pass through a region scheduled for welding R to a region under irradiation with laser light L a plurality of times. Consequently, it comes to that a part of the region scheduled for welding R will be intermittently irradiated with the laser light L. Therefore, it is possible to prevent the rise of temperature exceeding the level of decomposition temperature only by one irradiation with the laser light L. On top of that, it is so arranged that when the resin members 3 and 4 are made to pass a plurality of times through the region scheduled for welding R to the region under irradiation with the laser light L, the peak value of the temperature profile in the region R1 will appear a plurality of times between the melting temperature of the resin members 3 and 4 and the decomposition temperature of the resin members 3 and 4. Thus, the resin members 3 and 4 can be sufficiently welded to each other while preventing damage from occurring in the region scheduled for welding R. Therefore, the damage due to excess heat input can be prevented from occurring in the region scheduled for welding R and at the same time, the resin members 3 and 4 can be certainly welded to each other.

Description

本発明は、樹脂部材同士を溶着予定領域に沿って溶着して樹脂溶着体を製造する樹脂溶着方法に関する。   The present invention relates to a resin welding method for manufacturing a resin welded body by welding resin members along a planned welding region.

上記技術分野の樹脂溶着方法として、樹脂部材同士を溶着予定領域において接触させた状態で、レーザ光を溶着予定領域に沿って照射することにより、樹脂部材同士を溶着予定領域に沿って溶着する方法が知られている。   As a resin welding method in the above technical field, a method of welding resin members along a planned welding region by irradiating laser beams along the planned welding region in a state where the resin members are in contact with each other in the planned welding region. It has been known.

ところで、レーザ光に対して吸収性を有する樹脂部材においては、図１５に示されるように、樹脂部材におけるレーザ光の入射面でレーザ光の吸収光量が最も多くなり、レーザ光の入射面からの距離が大きくなるにしたがって（即ち、樹脂部材の内部に行くにしたがって）レーザ光の吸収光量が徐々に少なくなる。そのため、レーザ光に対して吸収性を有する樹脂部材同士を溶着する場合には、レーザ光の入射面及びその内側の近傍部分に、入熱過多による損傷（気泡、白濁、焼損等）が生じることがある。   By the way, in the resin member having absorptivity with respect to the laser beam, as shown in FIG. 15, the amount of absorbed laser beam is the largest at the incident surface of the laser beam in the resin member, and from the incident surface of the laser beam. As the distance increases (that is, as the distance to the inside of the resin member increases), the amount of laser light absorbed gradually decreases. For this reason, when resin members that absorb laser light are welded together, damage (bubbles, cloudiness, burnout, etc.) due to excessive heat input occurs on the laser light incident surface and in the vicinity of the inside. There is.

そのような損傷を防止するための樹脂溶着方法として、特許文献１には、樹脂部材におけるレーザ光の入射面に冷媒を供給しつつレーザ光の照射を行う方法が記載されている。   As a resin welding method for preventing such damage, Patent Document 1 describes a method in which a laser beam is irradiated while supplying a coolant to a laser beam incident surface of a resin member.

特開２００５−８８３５５号公報JP 2005-88355 A

しかしながら、特許文献１記載の樹脂溶着方法にあっては、樹脂部材におけるレーザ光の入射面での損傷の発生は防止し得るものの、レーザ光の入射面の内側の近傍部分での損傷の発生までも防止することは困難である。   However, in the resin welding method described in Patent Document 1, although the occurrence of damage on the incident surface of the laser beam in the resin member can be prevented, the occurrence of damage in the vicinity of the inner side of the incident surface of the laser beam can be prevented. It is difficult to prevent.

そこで、本発明は、溶着予定領域において入熱過多による損傷が発生するのを防止しつつ樹脂部材同士を確実に溶着することができる樹脂溶着方法を提供することを課題とする。   Then, this invention makes it a subject to provide the resin welding method which can weld the resin members reliably, preventing that the damage by excessive heat input generate | occur | produces in the welding plan area | region.

上記課題を解決するために、本発明の樹脂溶着方法は、第１の樹脂部材と第２の樹脂部材とを溶着予定領域に沿って溶着して樹脂溶着体を製造する樹脂溶着方法であって、第１の樹脂部材と第２の樹脂部材とを溶着予定領域において接触させる第１の工程と、第１の工程の後、レーザ光を溶着予定領域に沿って照射することにより、第１の樹脂部材と第２の樹脂部材とを溶着予定領域に沿って溶着する第２の工程と、を備え、第２の工程では、レーザ光の入射面となる第１の樹脂部材及び第２の樹脂部材の少なくとも一方の表面から所定の距離だけ内側の部分における温度プロファイルのピーク値が、第１の樹脂部材の溶融温度及び第２の樹脂部材の溶融温度のうちの高い方の溶融温度と、第１の樹脂部材の分解温度及び第２の樹脂部材の分解温度のうちの低い方の分解温度との間に複数回現れるように、レーザ光の照射領域を溶着予定領域に複数回通過させることを特徴とすることを特徴とする。   In order to solve the above problems, the resin welding method of the present invention is a resin welding method for manufacturing a resin welded body by welding a first resin member and a second resin member along a planned welding region. The first step of bringing the first resin member and the second resin member into contact with each other in the region to be welded and, after the first step, by irradiating the laser beam along the region to be welded, the first step A second step of welding the resin member and the second resin member along the planned welding region, and in the second step, a first resin member and a second resin that serve as a laser light incident surface The peak value of the temperature profile in the inner portion at a predetermined distance from at least one surface of the member is the higher one of the melting temperature of the first resin member and the melting temperature of the second resin member, The decomposition temperature of the first resin member and the amount of the second resin member As appears more than once between the lower of the decomposition temperature ones of temperature, characterized in that characterized in that multiple passes the irradiation region of the laser beam on the region to be fused.

この樹脂溶着方法では、第１の樹脂部材と第２の樹脂部材とを溶着する際に、レーザ光の照射領域を溶着予定領域に複数回通過させる。これにより、溶着予定領域の一部分に対してレーザ光が断続的に照射されることとなるので、溶着予定領域の一部分に対するレーザ光の１回の照射で樹脂部材の分解温度（損傷（気泡、白濁、焼損等）が生じる温度）を越えるような急激な温度上昇を防止することができる。しかも、この樹脂溶着方法では、レーザ光の照射領域を溶着予定領域に複数回通過させる際に、レーザ光の入射面の内側の部分における温度プロファイルのピーク値が、樹脂部材の溶融温度と樹脂部材の分解温度との間に複数回現れるようにする。これにより、溶着予定領域において損傷が生じるのを防止しつつ第１及び第２の樹脂部材を十分に溶融させることができる。よって、この樹脂溶着方法によれば、溶着予定領域において入熱過多による損傷が発生するのを防止しつつ樹脂部材同士を確実に溶着することができる。   In this resin welding method, when the first resin member and the second resin member are welded, the laser light irradiation region is passed through the planned welding region a plurality of times. As a result, the laser beam is intermittently irradiated to a part of the planned welding region, so that the decomposition temperature (damage (bubbles, white turbidity) of the resin member can be obtained by one irradiation of the laser beam to the part of the planned welding region. , A rapid temperature rise exceeding the temperature at which burning, etc. occurs) can be prevented. In addition, in this resin welding method, when the laser light irradiation region is passed through the region to be welded a plurality of times, the peak value of the temperature profile in the portion inside the laser light incident surface is determined by the melting temperature of the resin member and the resin member. Appears multiple times between the decomposition temperature of Thereby, it is possible to sufficiently melt the first and second resin members while preventing damage from occurring in the planned welding region. Therefore, according to this resin welding method, it is possible to reliably weld the resin members to each other while preventing damage due to excessive heat input in the planned welding region.

また、第２の工程では、レーザ光の入射面となる第１の樹脂部材及び第２の樹脂部材の少なくとも一方の表面の温度が、第１の樹脂部材の溶融温度及び第２の樹脂部材の溶融温度のうちの低い方の溶融温度未満の温度に維持されるように、照射領域を溶着予定領域に複数回通過させることが好ましい。この場合、第１の樹脂部材と第２の樹脂部材とを溶着する際に、レーザ光の入射面となる樹脂部材の表面が溶融せず、非溶融状態の樹脂部材の表面によって溶融状態の内側の部分が抑えられて発泡が防止されるので、樹脂部材の表面が滑らかに維持される。さらに、非溶融状態の樹脂部材の表面によって溶融状態の内側の部分が抑えられることで、溶融状態の内側の部分の圧力が高まるので、溶融した樹脂の混ざり合いが促進され、樹脂部材同士をより強固に溶着することができる。   Further, in the second step, the temperature of at least one surface of the first resin member and the second resin member serving as the laser light incident surface is determined by the melting temperature of the first resin member and the second resin member. It is preferable to pass the irradiation region through the planned welding region a plurality of times so that the melting temperature is maintained at a temperature lower than the lower melting temperature. In this case, when the first resin member and the second resin member are welded, the surface of the resin member that becomes the incident surface of the laser beam is not melted, and the inside of the molten state is formed by the surface of the non-molten resin member. Since this portion is suppressed and foaming is prevented, the surface of the resin member is maintained smoothly. Further, since the inner part of the molten state is suppressed by the surface of the non-molten resin member, the pressure of the inner part of the molten state is increased, so that mixing of the molten resin is promoted and the resin members are more It can be firmly welded.

また、第２の工程では、レーザ光の入射面となる第１の樹脂部材及び第２の樹脂部材の少なくとも一方の表面において、光軸に対して垂直な断面形状が環形状となるように、レーザ光を溶着予定領域に沿って照射することが好ましい。この場合、レーザ光の照射領域の中心部分において入熱過多となることが防止され、レーザ光の照射領域の移動方向と直交する方向において樹脂部材の温度が均一化される。したがって、溶着予定領域の全領域に渡って第１の樹脂部材と第２の樹脂部材との接合状態を均一化することができる。   Further, in the second step, at least one surface of the first resin member and the second resin member serving as the laser light incident surface, the cross-sectional shape perpendicular to the optical axis is an annular shape. It is preferable to irradiate the laser beam along the planned welding region. In this case, excessive heat input is prevented at the central portion of the laser light irradiation region, and the temperature of the resin member is made uniform in a direction orthogonal to the moving direction of the laser light irradiation region. Therefore, the joining state of the first resin member and the second resin member can be made uniform over the entire area of the planned welding area.

また、第２の工程では、溶着予定領域においてレーザ光が収束するように、レーザ光を溶着予定領域に沿って照射することが好ましい。この場合、光吸収によって減衰する光密度が補われて、溶着予定領域のレーザ光の入射側からその反対側に至る溶着予定領域の全領域で樹脂部材を十分に溶融させることができる。   In the second step, it is preferable to irradiate the laser beam along the planned welding region so that the laser beam converges in the planned welding region. In this case, the light density attenuated by the light absorption is compensated, and the resin member can be sufficiently melted in the entire region of the planned welding region from the laser beam incident side to the opposite side of the planned welding region.

或いは、第２の工程では、溶着予定領域においてレーザ光が発散するように、レーザ光を溶着予定領域に沿って照射することが好ましい。この場合、樹脂部材が入熱過多の状態になるのを抑制し、溶着予定領域の全領域で樹脂部材を適度に溶融させることができる。   Alternatively, in the second step, it is preferable to irradiate the laser beam along the planned welding region so that the laser beam diverges in the planned welding region. In this case, it is possible to suppress the resin member from being in a state of excessive heat input, and to appropriately melt the resin member in the entire region to be welded.

さらに、溶着予定領域は、環状に設定されていることが好ましい。この場合、レーザ光の照射領域を溶着予定領域に複数回通過させることが容易となる。   Furthermore, it is preferable that the welding planned area is set in an annular shape. In this case, it becomes easy to pass the laser light irradiation region through the planned welding region a plurality of times.

本発明によれば、溶着予定領域において入熱過多による損傷が発生するのを防止しつつ樹脂部材同士を確実に溶着することができる。   According to the present invention, it is possible to reliably weld the resin members while preventing damage due to excessive heat input in the planned welding region.

本発明の一実施形態の樹脂溶着方法によって製造された樹脂溶着体の斜視図である。It is a perspective view of the resin welding body manufactured by the resin welding method of one Embodiment of this invention. 図１に示された樹脂溶着体を製造するための樹脂溶着方法に用いられる樹脂溶着装置の斜視図である。It is a perspective view of the resin welding apparatus used for the resin welding method for manufacturing the resin welding body shown by FIG. 図２に示されたレーザ光出射部が備える集光光学系の構成図である。It is a block diagram of the condensing optical system with which the laser beam emission part shown by FIG. 2 is provided. 図３に示された集光光学系を通過したレーザ光の集光スポット到達前の光強度プロファイルを示すグラフである。It is a graph which shows the light intensity profile before the condensing spot of the laser beam which passed the condensing optical system shown by FIG. 図１に示された樹脂溶着体を製造するための樹脂溶着方法を説明するための斜視図である。It is a perspective view for demonstrating the resin welding method for manufacturing the resin welding body shown by FIG. 図１に示された樹脂溶着体を製造するための樹脂溶着方法を説明するための斜視図及び部分断面図である。It is the perspective view and partial sectional view for demonstrating the resin welding method for manufacturing the resin welded body shown by FIG. 図１に示された樹脂溶着体を製造するための樹脂溶着方法を説明するための斜視図である。It is a perspective view for demonstrating the resin welding method for manufacturing the resin welding body shown by FIG. 図１に示された樹脂溶着体を製造するための樹脂溶着方法を説明するための斜視図である。It is a perspective view for demonstrating the resin welding method for manufacturing the resin welding body shown by FIG. 図８のIX−IX線に沿っての部分断面図である。It is a fragmentary sectional view along the IX-IX line of FIG. 図９に示された内部領域の温度プロファイルを示すグラフである。FIG. 10 is a graph showing a temperature profile of the inner region shown in FIG. 9. FIG. 図２に示されたレーザ光出射部が備える他の集光光学系の構成図である。It is a block diagram of the other condensing optical system with which the laser beam emission part shown by FIG. 2 is provided. 図１１に示された集光光学系を用いた場合の樹脂溶着方法を説明するための部分断面図である。It is a fragmentary sectional view for demonstrating the resin welding method at the time of using the condensing optical system shown by FIG. 図１に示された樹脂溶着体を製造するための他の樹脂溶着方法を説明するための斜視図である。It is a perspective view for demonstrating the other resin welding method for manufacturing the resin welded body shown by FIG. 本発明の他の実施形態の樹脂溶着方法を説明するための部分断面図である。It is a fragmentary sectional view for demonstrating the resin welding method of other embodiment of this invention. 樹脂部材におけるレーザ光の入射面からの距離とレーザ光の吸収光量との関係を示すグラフである。It is a graph which shows the relationship between the distance from the incident surface of the laser beam in a resin member, and the absorbed light quantity of a laser beam.

以下、本発明の好適な実施形態について、図面を参照して詳細に説明する。なお、各図において同一又は相当部分には同一の符号を付し、重複する説明を省略する。   DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the same or an equivalent part, and the overlapping description is abbreviate | omitted.

図１は、本発明の一実施形態の樹脂溶着方法によって製造された樹脂溶着体の斜視図である。図１に示されるように、樹脂溶着体１は、矩形環状に設定された溶着予定領域Ｒに沿って樹脂部材３と樹脂部材４とが溶着されたものであり、樹脂部材３，４によって中空の直方体状に形成されている。樹脂部材３，４は、例えばポリアミド６６からなり、レーザ光Ｌに対して半吸収性を有している（例えば、レーザ光吸収性を付与するためのオリヱント化学製マスターバッチｅＢＩＮＤ（登録商標）ＡＣＷ（登録商標）−９８７１を、旭化成ケミカルズ社製レオナ（登録商標）１４Ｇ３３（ポリアミド６６にガラス繊維３３％を含む樹脂材料）に対して、２０〜６０倍に希釈倍率されるように添加した樹脂部材を使用することができる）。   FIG. 1 is a perspective view of a resin welded body manufactured by the resin welding method of one embodiment of the present invention. As shown in FIG. 1, a resin welded body 1 is formed by welding a resin member 3 and a resin member 4 along a planned welding region R set in a rectangular ring shape, and is hollowed by resin members 3 and 4. It is formed in a rectangular parallelepiped shape. The resin members 3 and 4 are made of, for example, polyamide 66 and have a semi-absorbability with respect to the laser beam L (for example, master batch eBIND (registered trademark) ACW manufactured by Orient Chemical Co., Ltd. for imparting the laser beam absorbability). Resin member in which (Registered Trademark) -9871 is added to Leona (Registered Trademark) 14G33 manufactured by Asahi Kasei Chemicals Corporation (resin material containing 33% glass fiber in polyamide 66) so as to be diluted 20 to 60 times. Can be used).

図２は、図１に示された樹脂溶着体を製造するための樹脂溶着方法に用いられる樹脂溶着装置の斜視図である。図２に示されるように、樹脂溶着装置２０は、レーザ光を伝送する光ファイバＦの先端に設けられたレーザ光出射部２１と、レーザ光出射部２１から出射されるレーザ光Ｌの光軸方向及びその方向と直交する方向に稼動する支持台２２と、レーザ光出射部２１から出射されるレーザ光の照射領域に対応する部分に対して冷却ガスを供給するための冷却ガス噴射部２３と、を備えている。   FIG. 2 is a perspective view of a resin welding apparatus used in the resin welding method for manufacturing the resin welded body shown in FIG. As shown in FIG. 2, the resin welding apparatus 20 includes a laser light emitting unit 21 provided at the tip of an optical fiber F that transmits laser light, and an optical axis of the laser light L emitted from the laser light emitting unit 21. A support base 22 that operates in a direction orthogonal to the direction, and a cooling gas injection unit 23 for supplying a cooling gas to a portion corresponding to the irradiation region of the laser beam emitted from the laser beam emitting unit 21; It is equipped with.

図３は、図２に示されたレーザ光出射部が備える集光光学系の構成図である。図３に示されるように、集光光学系５は、レーザ光Ｌの光源ＬＳ側から順に、コリメート用レンズ６、集光用レンズ７及び円錐凹状のアキシコンレンズ８が光軸ＯＡ上に配置されて構成されている。この集光光学系５をレーザ光Ｌが通過すると、光軸ＯＡに対して垂直なレーザ光Ｌの断面形状は、集光スポットＦＳに対して光源ＬＳ側で円環形状となり、集光スポットＦＳに対して光源ＬＳと反対側で中実円形状となる。   FIG. 3 is a configuration diagram of a condensing optical system provided in the laser beam emitting unit shown in FIG. As shown in FIG. 3, the condensing optical system 5 includes a collimating lens 6, a condensing lens 7, and a conical concave axicon lens 8 arranged on the optical axis OA in order from the light source LS side of the laser light L. Has been configured. When the laser light L passes through the condensing optical system 5, the cross-sectional shape of the laser light L perpendicular to the optical axis OA becomes an annular shape on the light source LS side with respect to the condensing spot FS, and the condensing spot FS. On the other hand, a solid circular shape is formed on the side opposite to the light source LS.

図４は、図３に示された集光光学系を通過したレーザ光の集光スポット到達前の光強度プロファイルを示すグラフである。図４に示されるように、レーザ光Ｌの強度プロファイルは、集光スポットＦＳ到達前において、ガウシアン分布やトップハット分布のレーザ光の光強度プロファイルとは逆に、中央部の光強度が周囲部の光強度よりも低いものとなっている。なお、図４の光強度プロファイルは、光軸ＯＡ及びレーザ光Ｌの進行方向と直交する方向についてレーザ光Ｌの光強度を積分したものである。   FIG. 4 is a graph showing a light intensity profile of the laser light that has passed through the condensing optical system shown in FIG. 3 before reaching the condensing spot. As shown in FIG. 4, the intensity profile of the laser beam L is different from the profile of the laser beam having the Gaussian distribution or the top-hat distribution before reaching the condensing spot FS. It is lower than the light intensity. The light intensity profile in FIG. 4 is obtained by integrating the light intensity of the laser light L in the direction orthogonal to the optical axis OA and the traveling direction of the laser light L.

以下、樹脂溶着装置２０を用いて樹脂溶着体１を製造する樹脂溶着方法について説明する。まず、図５に示されるように、樹脂部材３，４を用意する。樹脂部材３は、矩形板状の本体部３１、及び本体部３１の下面３１ｂから突出する断面矩形状の凸部３２を有している。樹脂部材４は、直方体状の本体部４１を有しており、本体部４１の上面４１ａには、断面矩形状の凹部４２が形成されている。   Hereinafter, a resin welding method for manufacturing the resin welded body 1 using the resin welding apparatus 20 will be described. First, as shown in FIG. 5, resin members 3 and 4 are prepared. The resin member 3 has a rectangular plate-shaped main body 31 and a convex section 32 having a rectangular cross section protruding from the lower surface 31 b of the main body 31. The resin member 4 has a rectangular parallelepiped main body 41, and a concave portion 42 having a rectangular cross section is formed on the upper surface 41 a of the main body 41.

続いて、図６（ａ）に示されるように、樹脂部材３の凸部３２を樹脂部材４の凹部４２の開口部に嵌め込むようにして樹脂部材３と樹脂部材４とを組み合わせて、被溶着体１０を準備する。図６（ｂ）は、図６（ａ）のVI−VI線に沿った部分断面図である。図６（ｂ）に示されるように、溶着予定領域Ｒは、樹脂部材３の本体部３１の下面３１ｂと樹脂部材４の本体部４１の上面４１ａとの重ね合わせの界面Ｂ１の内側の一部、及び樹脂部材３の凸部３２の側面３２ａと樹脂部材４の凹部４２の側面４２ａとの突合せの界面Ｂ２を含むように、矩形環状に設定されている。これにより、樹脂部材３と樹脂部材４とを溶着予定領域Ｒにおいて接触させることになる。   Subsequently, as shown in FIG. 6A, the resin member 3 and the resin member 4 are combined so that the convex portion 32 of the resin member 3 is fitted into the opening of the concave portion 42 of the resin member 4. 10 is prepared. FIG.6 (b) is a fragmentary sectional view along the VI-VI line of Fig.6 (a). As shown in FIG. 6B, the planned welding region R is a part of the inside of the overlapping interface B <b> 1 between the lower surface 31 b of the main body portion 31 of the resin member 3 and the upper surface 41 a of the main body portion 41 of the resin member 4. And a rectangular ring shape so as to include an abutting interface B2 between the side surface 32a of the convex portion 32 of the resin member 3 and the side surface 42a of the concave portion 42 of the resin member 4. As a result, the resin member 3 and the resin member 4 are brought into contact with each other in the planned welding region R.

続いて、図７に示されるように、樹脂部材３の本体部３１の上面３１ａがレーザ光Ｌの入射面となるように、被溶着体１０を支持台２２上に載置する。そして、レーザ光の入射面となる樹脂部材３の本体部３１の上面３１ａにおいて、光軸に対して垂直なレーザ光Ｌの断面形状が円環形状となるように、かつ、溶着予定領域Ｒにおいてレーザ光Ｌが収束するように、レーザ光出射部２１に対して支持台２２を駆動させる。   Subsequently, as shown in FIG. 7, the welded body 10 is placed on the support base 22 so that the upper surface 31 a of the main body 31 of the resin member 3 becomes the incident surface of the laser light L. Then, on the upper surface 31a of the main body 31 of the resin member 3 serving as the laser light incident surface, the cross-sectional shape of the laser light L perpendicular to the optical axis is an annular shape, and in the planned welding region R The support base 22 is driven with respect to the laser beam emitting portion 21 so that the laser beam L converges.

続いて、図８に示されるように、レーザ光Ｌを溶着予定領域Ｒに沿って照射することにより、樹脂部材３と樹脂部材４とを溶着予定領域Ｒに沿って溶着して樹脂溶着体１を製造する。より具体的には、レーザ光出射部２１から溶着予定領域Ｒに対してレーザ光Ｌを照射しながら、レーザ光Ｌの光軸方向と直交する面内において支持台２２を駆動させて、レーザ光Ｌの照射領域を溶着予定領域Ｒに沿って複数回周回させる（即ち、照射領域を溶着予定領域Ｒに複数回通過させる）。このとき、樹脂部材３の本体部３１の上面３１ａにおいてレーザ光Ｌの照射領域に対応する部分Ａは、冷却ガス噴射部２３から冷却ガスＧが吹き付けられて、樹脂部材３の溶融温度（融点）及び樹脂部材４の溶融温度（融点）のうちの低い方の溶融温度未満の温度に維持される。なお、レーザ光Ｌは、溶着予定領域Ｒにおいて樹脂部材３，４を溶融させ得るエネルギ密度を有している。   Next, as shown in FIG. 8, the resin member 3 and the resin member 4 are welded along the planned welding region R by irradiating the laser beam L along the planned welding region R, and the resin welded body 1. Manufacturing. More specifically, while the laser beam L is irradiated from the laser beam emitting portion 21 to the planned welding region R, the support base 22 is driven in a plane orthogonal to the optical axis direction of the laser beam L, and the laser beam is emitted. The irradiation region of L is circulated a plurality of times along the planned welding region R (that is, the irradiation region is passed through the planned welding region R a plurality of times). At this time, on the upper surface 31a of the main body 31 of the resin member 3, the portion A corresponding to the irradiation region of the laser light L is sprayed with the cooling gas G from the cooling gas injection unit 23, and the melting temperature (melting point) of the resin member 3 is reached. And it is maintained at a temperature lower than the lower one of the melting temperatures (melting points) of the resin member 4. The laser beam L has an energy density that can melt the resin members 3 and 4 in the planned welding region R.

レーザ光Ｌの照射領域を溶着予定領域Ｒに沿って複数回周回させることにより、溶着予定領域Ｒの一部分には、レーザ光Ｌの照射領域が断続的に通過することとなる。その結果、図９（ａ）に示されるように、樹脂部材３，４の内部において、溶融した樹脂からなる溶融領域Ｍが樹脂部材３，４の厚さ方向（図示下方）に徐々に深く進行していき、図９（ｂ）に示されるように、樹脂部材３と樹脂部材４との界面Ｂ１，Ｂ２に到達することで、樹脂部材３と樹脂部材４とが溶着される。   By rotating the irradiation region of the laser beam L a plurality of times along the planned welding region R, the irradiation region of the laser beam L intermittently passes through a part of the planned welding region R. As a result, as shown in FIG. 9A, the melted region M made of the molten resin gradually proceeds deeper in the thickness direction (downward in the figure) of the resin members 3 and 4 inside the resin members 3 and 4. Then, as shown in FIG. 9B, the resin member 3 and the resin member 4 are welded by reaching the interfaces B1 and B2 between the resin member 3 and the resin member 4.

なお、レーザ光Ｌの照射領域を溶着予定領域Ｒに複数回通過させる樹脂溶着方法は、樹脂部材３，４が結晶性樹脂である場合において特に有効である。結晶性樹脂は、光散乱性を有しているため、１回の照射ではレーザ光Ｌが樹脂の奥部に到達しない。しかし、レーザ光Ｌを複数回照射することにより、レーザ光Ｌが照射される度に、次第に樹脂表層から結晶化した樹脂が溶融して液体になり光散乱因子が減少するので、レーザ拡散透過率が上がり、樹脂部材の奥部までレーザ光Ｌが到達するようになる。したがって、レーザ光Ｌを複数回照射することにより、樹脂部材が結晶性樹脂である場合においても、その奥部まで十分に溶融させることができる。   The resin welding method in which the irradiation region of the laser beam L is allowed to pass through the planned welding region R a plurality of times is particularly effective when the resin members 3 and 4 are crystalline resins. Since the crystalline resin has light scattering properties, the laser light L does not reach the inner part of the resin by one irradiation. However, by irradiating the laser beam L a plurality of times, each time the laser beam L is irradiated, the resin crystallized from the resin surface layer gradually melts to become a liquid and the light scattering factor decreases. And the laser beam L reaches the back of the resin member. Therefore, by irradiating the laser beam L a plurality of times, even when the resin member is a crystalline resin, it can be sufficiently melted to the back.

ここで、レーザ光Ｌの照射領域を溶着予定領域Ｒに複数回通過させる際には、レーザ光Ｌの入射面となる樹脂部材３の本体部３１の上面３１ａから所定の距離（例えば、数百μｍ（即ち１００μｍ〜１ｍｍ、好ましくは１００μｍ〜３００μｍ））だけ内側の所定の部分（例えば、図９に示される内部領域Ｒ１）における温度プロファイルのピーク値が、樹脂部材３の溶融温度及び樹脂部材４の溶融温度のうちの高い方の溶融温度と、樹脂部材３の分解温度及び樹脂部材４の分解温度のうちの低い方の分解温度との間に複数回現れるように（より具体的には連続して複数回現れるように）、溶着予定領域Ｒに対するレーザ光Ｌの照射領域の移動速度（即ち、照射領域の溶着予定領域Ｒに沿っての毎分の回転数）を制御する。   Here, when the irradiation region of the laser beam L is allowed to pass through the planned welding region R a plurality of times, a predetermined distance (for example, several hundreds) from the upper surface 31a of the main body 31 of the resin member 3 that becomes the incident surface of the laser beam L. The peak value of the temperature profile in a predetermined portion (for example, the inner region R1 shown in FIG. 9) inside by μm (that is, 100 μm to 1 mm, preferably 100 μm to 300 μm) is the melting temperature of the resin member 3 and the resin member 4. So as to appear a plurality of times (more specifically, continuous) between the higher melting temperature of the melting temperature of the resin member 3 and the lower decomposition temperature of the decomposition temperature of the resin member 3 and the decomposition temperature of the resin member 4. In other words, the moving speed of the irradiation region of the laser light L with respect to the planned welding region R (that is, the number of revolutions per minute along the planned welding region R in the irradiation region) is controlled.

なお、上記所定の部分における温度プロファイルのピーク値が、樹脂部材３の溶融温度及び樹脂部材４の溶融温度のうちの高い方の溶融温度と、樹脂部材３の分解温度及び樹脂部材４の分解温度のうちの低い方の分解温度との間に連続して複数回現れる間においては、上記所定の部分の温度が、樹脂部材３の溶融温度及び樹脂部材４の溶融温度のうちの高い方の溶融温度と、樹脂部材３の分解温度及び樹脂部材４の分解温度のうちの低い方の分解温度との間に維持されるように、溶着予定領域Ｒに対するレーザ光Ｌの照射領域の移動速度を制御することが好ましい。   Note that the peak value of the temperature profile in the predetermined portion is the higher of the melting temperature of the resin member 3 and the melting temperature of the resin member 4, the decomposition temperature of the resin member 3, and the decomposition temperature of the resin member 4. The temperature of the predetermined portion is the higher of the melting temperature of the resin member 3 and the melting temperature of the resin member 4 while it appears continuously several times between the lower decomposition temperature and the melting temperature of the resin member 4. The moving speed of the irradiation region of the laser beam L with respect to the planned welding region R is controlled so that the temperature is maintained between the decomposition temperature of the resin member 3 and the lower decomposition temperature of the resin member 4. It is preferable to do.

また、ここでの分解温度とは、樹脂部材３，４の質量の減少が生じ始める温度であって、真空中で３０分間加熱した場合に質量が半分になる温度として定義される熱分解温度がその目安となる。樹脂部材３，４に用いられる樹脂材料の溶融温度と熱分解温度とは以下のように例示される。   Moreover, the decomposition temperature here is a temperature at which the mass of the resin members 3 and 4 starts to decrease, and a thermal decomposition temperature defined as a temperature at which the mass is halved when heated in a vacuum for 30 minutes. It becomes the standard. The melting temperature and thermal decomposition temperature of the resin material used for the resin members 3 and 4 are exemplified as follows.

ポリアミド６６：溶融温度２６０℃、熱分解温度３１０℃以上
ポリアミド６ ：溶融温度２２８℃、熱分解温度３１０℃以上
ポリプロピレン：溶融温度１４８℃、熱分解温度３２８℃以上 Polyamide 66: Melting temperature 260 ° C., thermal decomposition temperature 310 ° C. or higher Polyamide 6: Melting temperature 228 ° C., thermal decomposition temperature 310 ° C. or higher Polypropylene: Melting temperature 148 ° C., thermal decomposition temperature 328 ° C. or higher

図１０は、図９に示された内部領域の温度プロファイルを示すグラフである。図１０に示されるように、内部領域Ｒ１における温度プロファイルのピーク値が、樹脂部材３，４の溶融温度（約２００℃）と樹脂部材３，４の分解温度（約３００℃）との間に複数現れるのは、レーザ光Ｌの照射領域の溶着予定領域Ｒに沿っての回転数が、５０ｒｐｍの場合及び１００ｒｐｍの場合である。なお、温度プロファイルのピーク値とは、時間（横軸）と温度（縦軸）との関係を示すグラフ（図１０のグラフ）の極大値を意味する。   FIG. 10 is a graph showing a temperature profile of the inner region shown in FIG. As shown in FIG. 10, the peak value of the temperature profile in the internal region R1 is between the melting temperature (about 200 ° C.) of the resin members 3 and 4 and the decomposition temperature (about 300 ° C.) of the resin members 3 and 4. A plurality of cases appear when the number of rotations along the planned welding region R of the irradiation region of the laser light L is 50 rpm and 100 rpm. The peak value of the temperature profile means the maximum value of a graph (graph of FIG. 10) showing the relationship between time (horizontal axis) and temperature (vertical axis).

レーザ光Ｌの照射領域の溶着予定領域Ｒに沿っての回転数が、５ｒｐｍの場合、１０ｒｐｍの場合及び２０ｒｐｍの場合には、溶着予定領域Ｒの一部分にレーザ光Ｌが照射される１回当たりの時間が比較的長くなるため、溶着予定領域Ｒの一部分に対するレーザ光Ｌの１回の照射で樹脂部材３，４の分解温度を超えるような急激な温度上昇が生じてしまう。これに対して、レーザ光Ｌの照射領域の溶着予定領域Ｒに沿っての回転数が、５０ｒｐｍの場合及び１００ｒｐｍの場合には、溶着予定領域Ｒの一部分にレーザ光Ｌが照射される１回当たりの時間が比較的短くなるため、溶着予定領域Ｒの一部分に対するレーザ光Ｌの１回の照射で樹脂部材３，４の分解温度を超えるような急激な温度上昇が生じない。   When the number of rotations of the irradiation region of the laser beam L along the planned welding region R is 5 rpm, 10 rpm, and 20 rpm, a portion of the welding planned region R is irradiated with the laser light L once. Since this time becomes relatively long, a single temperature of the laser beam L is irradiated to a part of the planned welding region R, and a rapid temperature rise that exceeds the decomposition temperature of the resin members 3 and 4 occurs. On the other hand, when the number of rotations of the irradiation region of the laser beam L along the planned welding region R is 50 rpm and 100 rpm, the laser beam L is irradiated once on a part of the planned welding region R. Since the hitting time is relatively short, a rapid increase in temperature that does not exceed the decomposition temperature of the resin members 3 and 4 by one irradiation of the laser beam L to a portion of the planned welding region R does not occur.

したがって、この工程では、レーザ光Ｌの照射領域の溶着予定領域Ｒに沿っての回転数が５０ｒｐｍ以上となるように、溶着予定領域Ｒに対するレーザ光Ｌの照射領域の移動速度を制御することが好ましい。このように照射領域の移動速度を制御することによって、樹脂部材３，４の溶融温度と樹脂部材３，４の分解温度との間の温度を長く維持して、溶着予定領域Ｒにおいて樹脂部材３，４に損傷が生じることを防止しつつ、溶着予定領域Ｒにおいて樹脂部材３，４を十分に溶融させることができる。   Therefore, in this step, it is possible to control the moving speed of the irradiation region of the laser light L with respect to the planned welding region R so that the number of rotations of the irradiation region of the laser light L along the planned welding region R becomes 50 rpm or more. preferable. In this way, by controlling the moving speed of the irradiation region, the temperature between the melting temperature of the resin members 3 and 4 and the decomposition temperature of the resin members 3 and 4 is maintained long, and the resin member 3 in the welding planned region R is maintained. The resin members 3 and 4 can be sufficiently melted in the planned welding region R while preventing damage to the.

ただし、レーザ光Ｌの照射領域の溶着予定領域Ｒに沿っての回転数が５０ｒｐｍ未満であっても、照射領域の溶着予定領域Ｒに沿っての回転が進むにつれて（即ち、照射領域を溶着予定領域Ｒに通過させる回数が増すにつれて）レーザ光Ｌの出力を徐々に上昇させたり、レーザ光Ｌの焦点の樹脂部材３，４に対する深度を徐々に深くしたりすることによって、溶着予定領域Ｒにおいて樹脂部材３，４に損傷が生じることを防止しつつ、溶着予定領域Ｒにおいて樹脂部材３，４を十分に溶融させることができる。   However, even if the rotation number of the irradiation region of the laser beam L along the planned welding region R is less than 50 rpm, the rotation of the irradiation region along the planned welding region R proceeds (that is, the irradiation region is planned to be welded). By gradually increasing the output of the laser light L or gradually increasing the depth of the focal point of the laser light L with respect to the resin members 3 and 4 (as the number of times of passage through the region R increases) The resin members 3 and 4 can be sufficiently melted in the welding planned region R while preventing the resin members 3 and 4 from being damaged.

以上説明したように、樹脂溶着体１を製造するための樹脂溶着方法では、樹脂部材３と樹脂部材４とを溶着する際に、レーザ光Ｌの照射領域を溶着予定領域Ｒに複数回通過させる。これにより、溶着予定領域Ｒの一部分に対してレーザ光Ｌが断続的に照射されることとなるので、溶着予定領域Ｒの一部分に対するレーザ光の１回の照射で樹脂部材３，４の分解温度を越えるような急激な温度上昇を防止することができる。   As described above, in the resin welding method for manufacturing the resin welded body 1, when the resin member 3 and the resin member 4 are welded, the irradiation region of the laser light L is passed through the planned welding region R a plurality of times. . As a result, the laser beam L is intermittently applied to a part of the planned welding region R, so that the decomposition temperature of the resin members 3 and 4 can be reduced by a single irradiation of the laser beam to a part of the planned welding region R. Thus, it is possible to prevent a rapid temperature increase exceeding

しかも、レーザ光Ｌの照射領域を溶着予定領域Ｒに複数回通過させる際に、レーザ光Ｌの入射面となる樹脂部材３の本体部３１の上面３１ａから所定の距離だけ内側の内部領域Ｒ１における温度プロファイルのピーク値が、樹脂部材３，４の溶融温度の高い方の温度と樹脂部材３，４の分解温度の低い方の温度との間に複数回現れるようにする。これにより、溶着予定領域Ｒにおいて損傷が生じるのを防止しつつ樹脂部材３，４を十分に溶融させることができる。よって、この樹脂溶着方法によれば、溶着予定領域Ｒにおいて入熱過多による損傷が発生することを防止しつつ樹脂部材３と樹脂部材４とを確実に溶着することができる。特に、この樹脂溶着方法は、樹脂部材３，４が、上記のように溶融温度と熱分解温度とが比較的近いために焼損し易く加工が困難なポリアミド６６からなる場合についても好適に適用できる。   In addition, when the irradiation region of the laser beam L is allowed to pass through the planned welding region R a plurality of times, in the inner region R1 that is a predetermined distance from the upper surface 31a of the main body 31 of the resin member 3 that becomes the incident surface of the laser beam L. The peak value of the temperature profile is caused to appear a plurality of times between the higher melting temperature of the resin members 3 and 4 and the lower decomposition temperature of the resin members 3 and 4. Thereby, it is possible to sufficiently melt the resin members 3 and 4 while preventing damage in the planned welding region R. Therefore, according to this resin welding method, it is possible to reliably weld the resin member 3 and the resin member 4 while preventing damage due to excessive heat input in the planned welding region R. In particular, this resin welding method can also be suitably applied to the case where the resin members 3 and 4 are made of polyamide 66 which is easily burned and difficult to process because the melting temperature and the thermal decomposition temperature are relatively close as described above. .

さらに、レーザ光Ｌの照射領域の溶着予定領域Ｒに沿っての毎分の回転数を調整することにより、樹脂部材３と樹脂部材４とを好適に溶着するための条件を得ることができるので、制御系の簡素化が図られ、樹脂部材３と樹脂部材４とを溶着するための装置の低コスト化が図られる。   Furthermore, by adjusting the number of rotations per minute along the planned welding region R of the irradiation region of the laser light L, conditions for suitably welding the resin member 3 and the resin member 4 can be obtained. The control system can be simplified, and the cost of the apparatus for welding the resin member 3 and the resin member 4 can be reduced.

また、この樹脂溶着方法においては、レーザ光Ｌの入射面となる樹脂部材３の本体部３１の上面３１ａにおけるレーザ光Ｌの照射領域に対応する部分Ａが、冷却ガス噴射部２３からの冷却ガスＧによって冷却され、樹脂部材３の溶融温度及び樹脂部材４の溶融温度のうちの低い方の溶融温度未満の温度に維持される。このため、樹脂部材３と樹脂部材４とを溶着する際に、レーザ光Ｌの入射面となる樹脂部材３の本体部３１の上面３１ａが溶融せず、非溶融状態の上面３１ａによって樹脂部材３の溶融状態の内側の部分が抑えられて発泡が防止されるので、上面３１ａが滑らかに維持される。さらに、非溶融状態の上面３１ａによって樹脂部材３の溶融状態の内側の部分が抑えられることで、溶融状態の内側の部分の圧力が高まるので、溶融した樹脂の混ざり合いが促進され、樹脂部材３と樹脂部材４とをより強固に溶着することができる。   Further, in this resin welding method, the portion A corresponding to the irradiation region of the laser beam L on the upper surface 31 a of the main body 31 of the resin member 3 that becomes the incident surface of the laser beam L is the cooling gas from the cooling gas injection unit 23. It is cooled by G and maintained at a temperature lower than the lower one of the melting temperature of the resin member 3 and the melting temperature of the resin member 4. For this reason, when the resin member 3 and the resin member 4 are welded, the upper surface 31a of the main body 31 of the resin member 3 that becomes the incident surface of the laser beam L is not melted, and the resin member 3 is not melted by the upper surface 31a in the non-molten state. Since the inner portion of the molten state is suppressed and foaming is prevented, the upper surface 31a is maintained smoothly. Furthermore, since the inner portion of the molten state of the resin member 3 is suppressed by the non-molten upper surface 31a, the pressure of the inner portion of the molten state is increased, so that mixing of the molten resin is promoted, and the resin member 3 And the resin member 4 can be welded more firmly.

さらに、この樹脂溶着方法においては、樹脂部材３と樹脂部材４とを溶着する際に、溶着予定領域Ｒに対して照射されるレーザ光Ｌの断面形状が、樹脂部材３の本体部３１の上面３１ａにおいて円環形状となるように、レーザ光Ｌを溶着予定領域Ｒに沿って照射する。このため、レーザ光Ｌの照射領域の中心部分において入熱過多となることが防止され、レーザ光Ｌの照射領域の移動方向と直交する方向において樹脂部材３，４の温度が均一化される。したがって、溶着予定領域Ｒの全領域に渡って樹脂部材３と樹脂部材４との接合状態を均一化することができる。   Furthermore, in this resin welding method, when the resin member 3 and the resin member 4 are welded, the cross-sectional shape of the laser light L irradiated to the welding planned region R is the upper surface of the main body 31 of the resin member 3. The laser beam L is irradiated along the planned welding region R so as to form an annular shape at 31a. For this reason, excessive heat input is prevented in the central portion of the irradiation region of the laser light L, and the temperatures of the resin members 3 and 4 are made uniform in a direction orthogonal to the moving direction of the irradiation region of the laser light L. Therefore, the joining state of the resin member 3 and the resin member 4 can be made uniform over the entire region of the welding planned region R.

なお、上述した樹脂溶着方法に用いられる樹脂溶着装置２０においては、レーザ光出射部２１は、集光光学系５に換えて、図１１に示される集光光学系５０を備えることができる。図１１に示されるように、集光光学系５０は、レーザ光Ｌの光源ＬＳ側から順に、コリメート用レンズ６、集光用レンズ７及び円錐凸状のアキシコンレンズ５８が光軸ＯＡ上に配置されて構成されている。この集光光学系５０をレーザ光Ｌが通過すると、光軸ＯＡに対して垂直なレーザ光Ｌの断面形状は、集光スポットＦＳに対して光源ＬＳ側で中実円形状となり、集光スポットＦＳに対して光源ＬＳと反対側で円環形状となる。このようなレーザ光Ｌの光強度プロファイルは、集光スポットＦＳ到達後において、ガウシアン分布やトップハット分布のレーザ光の光強度プロファイルとは逆に、中央部の光強度が周囲部の光強度よりも低いものとなっている（図４参照）。   In the resin welding apparatus 20 used in the above-described resin welding method, the laser light emitting unit 21 can include a condensing optical system 50 shown in FIG. 11 instead of the condensing optical system 5. As shown in FIG. 11, the condensing optical system 50 includes a collimating lens 6, a condensing lens 7, and a conical convex axicon lens 58 on the optical axis OA in order from the light source LS side of the laser light L. Arranged and configured. When the laser light L passes through the condensing optical system 50, the cross-sectional shape of the laser light L perpendicular to the optical axis OA becomes a solid circular shape on the light source LS side with respect to the condensing spot FS. It has an annular shape on the side opposite to the light source LS with respect to the FS. Such a light intensity profile of the laser light L is opposite to the light intensity profile of the laser light of the Gaussian distribution or the top hat distribution after reaching the converging spot FS, and the light intensity of the central part is more than the light intensity of the peripheral part. (See FIG. 4).

このような集光光学系５０を備えた樹脂溶着装置２０を用いる場合には、樹脂部材３と樹脂部材４とを溶着する際に、図１２に示されるように、溶着予定領域Ｒにおいてレーザ光Ｌが発散するように、レーザ光Ｌを溶着予定領域Ｒに沿って照射する。これにより、樹脂部材３，４が入熱過多の状態になるのを抑制し、溶着予定領域Ｒのレーザ光Ｌの入射側からその反対側に至る溶着予定領域Ｒの全領域で樹脂部材３，４を適度に溶融させることができる。   When using the resin welding apparatus 20 provided with such a condensing optical system 50, when welding the resin member 3 and the resin member 4, as shown in FIG. Laser light L is irradiated along the planned welding region R so that L diverges. Accordingly, the resin members 3 and 4 are prevented from being in a state of excessive heat input, and the resin members 3 and 3 are covered in the entire region of the welding planned region R from the incident side of the laser beam L in the welding planned region R to the opposite side. 4 can be melted moderately.

なお、上述した樹脂溶着方法においては、集光光学系５や集光光学系５０を用いずに、光ファイバＦからのレーザ光を溶着予定領域Ｒに直接集光させてもよい。   In the resin welding method described above, the laser light from the optical fiber F may be directly focused on the planned welding region R without using the condensing optical system 5 and the condensing optical system 50.

また、上述した樹脂溶着方法においては、レーザ光Ｌの照射領域を溶着予定領域Ｒに沿って周回させるために、被溶着体１０が載置された支持台２２を駆動させたが、レーザ光Ｌの照射領域を溶着予定領域Ｒに沿って周回させるための態様はこれに限定されない。例えば、上述した樹脂溶着方法においては、樹脂溶着装置２０に替えて、図１３に示される樹脂溶着装置６０を用いることもできる。   Further, in the above-described resin welding method, in order to make the irradiation region of the laser beam L circulate along the planned welding region R, the support base 22 on which the welded body 10 is placed is driven. The mode for rotating the irradiation region along the planned welding region R is not limited to this. For example, in the above-described resin welding method, a resin welding apparatus 60 shown in FIG. 13 can be used instead of the resin welding apparatus 20.

図１３に示されるように、樹脂溶着装置６０は、被溶着体１０を載置するための支持台６１と、光ファイバＦを伝送したレーザ光を平行光化するためのコリメート光学系６２と、コリメート光学系６２からのレーザ光を、その断面形状が円環形状となるように整形するためのアキシコンレンズを含む整形光学系６３と、整形光学系６３からのレーザ光を支持台６１に載置された被溶着体１０に照射するためのガルバノ光学系６４と、を備えている。また、ガルバノ光学系６４は、整形光学系６３からのレーザ光のＸ方向についての角度を変更するためのガルバノミラー６５と、ガルバノミラー６５によって反射されたレーザ光のＹ方向（Ｘ方向に直交する方向）についての角度を変更するためのガルバノミラー６６と、ガルバノミラー６６によって反射されたレーザ光が入射され、そのレーザ光の入射角に応じて樹脂部材３の本体部３１の上面３１ａのＸ−Ｙ方向における所定の位置に対してレーザ光Ｌを出射するＦθレンズ６７とを含む。   As shown in FIG. 13, the resin welding apparatus 60 includes a support base 61 for placing the object to be welded 10, a collimating optical system 62 for collimating the laser light transmitted through the optical fiber F, A shaping optical system 63 including an axicon lens for shaping the laser light from the collimating optical system 62 so that the cross-sectional shape thereof is an annular shape, and the laser light from the shaping optical system 63 are mounted on the support base 61. And a galvano optical system 64 for irradiating the welded body 10 placed thereon. The galvano optical system 64 includes a galvano mirror 65 for changing the angle of the laser light from the shaping optical system 63 in the X direction, and the Y direction of the laser light reflected by the galvano mirror 65 (perpendicular to the X direction). The galvanometer mirror 66 for changing the angle of the direction) and the laser beam reflected by the galvanometer mirror 66 are incident, and X− of the upper surface 31a of the main body portion 31 of the resin member 3 according to the incident angle of the laser beam. And an Fθ lens 67 that emits laser light L to a predetermined position in the Y direction.

したがって、この樹脂溶着装置６０においては、ガルバノミラー６５及びガルバノミラー６６の角度を適宜制御することによって、レーザ光Ｌの照射領域を溶着予定領域Ｒに沿って周回させることができる。上述した樹脂溶着方法において、この樹脂溶着装置６０を用いれば、樹脂溶着装置２０を用いた場合に比べて容易にレーザ光Ｌの照射領域を溶着予定領域Ｒに沿って高速で周回させることができる。なお、樹脂溶着装置６０を用いる場合には、レーザ光Ｌの入射面となる樹脂部材３の本体部３１の上面３１ａ全体を、冷却ガスＧによって冷却することができる。   Therefore, in this resin welding apparatus 60, the irradiation area of the laser light L can be circulated along the planned welding area R by appropriately controlling the angles of the galvanometer mirror 65 and the galvanometer mirror 66. In the resin welding method described above, if this resin welding device 60 is used, the irradiation region of the laser light L can be easily circulated along the planned welding region R at a high speed as compared with the case where the resin welding device 20 is used. . In addition, when using the resin welding apparatus 60, the whole upper surface 31a of the main-body part 31 of the resin member 3 used as the incident surface of the laser beam L can be cooled with the cooling gas G. FIG.

ここで、樹脂溶着装置２０及び樹脂溶着装置６０においては、レーザ光Ｌの照射領域の移動速度が、溶着予定領域Ｒの角部（樹脂部材３の本体部３１の上面３１ａの四隅近傍の部分）において比較的遅くなる場合がある。そのような場合には、溶着予定領域Ｒの角部において、レーザ光Ｌによる入熱量が他の部分よりも大きくなるので、溶着予定領域Ｒの各角部に冷却ガス噴射部を別途配設するなどし、当該各角部に冷却ガスをさらに供給して重点的に冷却することが好ましい。   Here, in the resin welding device 20 and the resin welding device 60, the moving speed of the irradiation region of the laser light L is the corner of the planned welding region R (the portions near the four corners of the upper surface 31a of the main body 31 of the resin member 3). May be relatively slow. In such a case, since the amount of heat input by the laser light L is larger at the corners of the planned welding region R than at other portions, a cooling gas injection unit is separately provided at each corner of the planned welding region R. For example, it is preferable to further supply a cooling gas to each corner to cool it intensively.

なお、本実施形態においては、樹脂溶着体１を製造するための樹脂溶着方法として、溶着予定領域Ｒが重ね合わせの界面Ｂ１の一部と突合せの界面Ｂ２とを含む場合について説明したが、本発明の樹脂溶着方法は、溶着予定領域Ｒが、図１４に示されるように、所定の樹脂部材（第１の樹脂部材）１３と他の所定の樹脂部材（第２の樹脂部材）１４との突合せ界面Ｂ３の一部のみを含む場合にも好適に適用できる。そのような場合には、レーザ光Ｌの入射面は、樹脂部材１３の上面１３ａと樹脂部材１４の上面１４ａとの両方となる。   In the present embodiment, as a resin welding method for manufacturing the resin welded body 1, a case where the planned welding region R includes a part of the overlapping interface B1 and the butt interface B2 has been described. According to the resin welding method of the present invention, as shown in FIG. 14, the planned welding region R includes a predetermined resin member (first resin member) 13 and another predetermined resin member (second resin member) 14. The present invention can also be suitably applied to a case where only a part of the butt interface B3 is included. In such a case, the incident surface of the laser beam L is both the upper surface 13a of the resin member 13 and the upper surface 14a of the resin member 14.

また、本実施形態においては、樹脂溶着体１を製造するための樹脂溶着方法として、溶着予定領域Ｒが環状に設定される場合について説明したが、本発明の樹脂溶着方法は、溶着予定領域Ｒが環状でない場合についても好適に適用できる。そのような場合には、レーザ光Ｌの照射領域を溶着予定領域Ｒに複数回通過させる際に、レーザ光Ｌの入射面から所定の距離だけ内側の部分における温度プロファイルのピーク値が、樹脂部材の溶融温度と分解温度との間に複数回現れるように、溶着予定領域Ｒに対する照射領域の毎分の通過回数を制御する。   Moreover, in this embodiment, although the case where the welding plan area | region R was set cyclically | annularly was demonstrated as a resin welding method for manufacturing the resin welding body 1, the resin welding method of this invention is the welding plan area | region R. The present invention can also be suitably applied to cases where is not annular. In such a case, when passing the irradiation region of the laser light L through the planned welding region R a plurality of times, the peak value of the temperature profile in the portion inside by a predetermined distance from the incident surface of the laser light L is a resin member. The number of passes of the irradiation region per minute with respect to the welding planned region R is controlled so that it appears a plurality of times between the melting temperature and the decomposition temperature.

さらに、溶着予定領域Ｒの形状は、溶着する樹脂部材の形状に合わせて、３次元的な環状に設定することもできる。   Furthermore, the shape of the planned welding region R can be set in a three-dimensional annular shape in accordance with the shape of the resin member to be welded.

１…樹脂溶着体、３，１３…樹脂部材（第１の樹脂部材）、４，１４…樹脂部材（第２の樹脂部材）、Ｒ…溶着予定領域、Ｌ…レーザ光。
DESCRIPTION OF SYMBOLS 1 ... Resin welding body, 3,13 ... Resin member (1st resin member), 4,14 ... Resin member (2nd resin member), R ... Welding plan area | region, L ... Laser beam.

Claims (6)

第１の樹脂部材と第２の樹脂部材とを溶着予定領域に沿って溶着して樹脂溶着体を製造する樹脂溶着方法であって、
前記第１の樹脂部材と前記第２の樹脂部材とを前記溶着予定領域において接触させる第１の工程と、
前記第１の工程の後、レーザ光を前記溶着予定領域に沿って照射することにより、前記第１の樹脂部材と前記第２の樹脂部材とを前記溶着予定領域に沿って溶着する第２の工程と、を備え、
前記第２の工程では、レーザ光の入射面となる前記第１の樹脂部材及び前記第２の樹脂部材の少なくとも一方の表面から所定の距離だけ内側の部分における温度プロファイルのピーク値が、前記第１の樹脂部材の溶融温度及び前記第２の樹脂部材の溶融温度のうちの高い方の溶融温度と、前記第１の樹脂部材の分解温度及び前記第２の樹脂部材の分解温度のうちの低い方の分解温度との間に複数回現れるように、前記レーザ光の照射領域を前記溶着予定領域に複数回通過させることを特徴とする樹脂溶着方法。 A resin welding method for manufacturing a resin welded body by welding a first resin member and a second resin member along a planned welding region,
A first step of bringing the first resin member and the second resin member into contact with each other in the planned welding region;
After the first step, a second laser beam is welded along the planned welding region by irradiating laser light along the planned welding region. A process,
In the second step, the peak value of the temperature profile in a portion that is a predetermined distance from the surface of at least one of the first resin member and the second resin member serving as a laser light incident surface is the first value. The higher one of the melting temperature of the first resin member and the melting temperature of the second resin member, and the lower of the decomposition temperature of the first resin member and the decomposition temperature of the second resin member The resin welding method is characterized in that the laser light irradiation region is allowed to pass through the welding planned region a plurality of times so as to appear a plurality of times between the decomposition temperature. 前記第２の工程では、前記レーザ光の入射面となる前記第１の樹脂部材及び前記第２の樹脂部材の少なくとも一方の表面の温度が、前記第１の樹脂部材の溶融温度及び前記第２の樹脂部材の溶融温度のうちの低い方の溶融温度未満の温度に維持されるように、前記照射領域を前記溶着予定領域に複数回通過させることを特徴とする請求項１記載の樹脂溶着方法。   In the second step, the temperature of at least one surface of the first resin member and the second resin member serving as the laser light incident surface is determined by the melting temperature of the first resin member and the second resin member. 2. The resin welding method according to claim 1, wherein the irradiation region is passed through the welding planned region a plurality of times so as to be maintained at a temperature lower than the lower one of the melting temperatures of the resin members. . 前記第２の工程では、前記レーザ光の入射面となる前記第１の樹脂部材及び前記第２の樹脂部材の少なくとも一方の表面において、光軸に対して垂直な断面形状が環形状となるように、前記レーザ光を前記溶着予定領域に沿って照射することを特徴とする請求項１又は２記載の樹脂溶着方法。   In the second step, at least one surface of the first resin member and the second resin member serving as the laser light incident surface has a ring-shaped cross section perpendicular to the optical axis. 3. The resin welding method according to claim 1, wherein the laser beam is irradiated along the planned welding region. 前記第２の工程では、前記溶着予定領域において前記レーザ光が収束するように、前記レーザ光を前記溶着予定領域に沿って照射することを特徴とする請求項１〜３のいずれか一項記載の樹脂溶着方法。   The said 2nd process WHEREIN: The said laser beam is irradiated along the said welding plan area | region so that the said laser beam may converge in the said welding plan area | region, The any one of Claims 1-3 characterized by the above-mentioned. Resin welding method. 前記第２の工程では、前記溶着予定領域において前記レーザ光が発散するように、前記レーザ光を前記溶着予定領域に沿って照射することを特徴とする請求項１〜３のいずれか一項記載の樹脂溶着方法。   The said 2nd process WHEREIN: The said laser beam is irradiated along the said welding plan area | region so that the said laser beam may diverge in the said welding plan area | region, The any one of Claims 1-3 characterized by the above-mentioned. Resin welding method. 前記溶着予定領域は、環状に設定されていることを特徴とする請求項１〜５のいずれか一項記載の樹脂溶着方法。   The resin welding method according to claim 1, wherein the welding scheduled area is set in an annular shape.
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