JP6724443B2 - Laser joining method - Google Patents

Laser joining method Download PDF

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Publication number
JP6724443B2
JP6724443B2 JP2016052587A JP2016052587A JP6724443B2 JP 6724443 B2 JP6724443 B2 JP 6724443B2 JP 2016052587 A JP2016052587 A JP 2016052587A JP 2016052587 A JP2016052587 A JP 2016052587A JP 6724443 B2 JP6724443 B2 JP 6724443B2
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JP
Japan
Prior art keywords
laser
resin
resin member
softening
melting
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Application number
JP2016052587A
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Japanese (ja)
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JP2017164986A (en
Inventor
孝 鴨志田
孝 鴨志田
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Fuji Electric Co Ltd
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Fuji Electric Co Ltd
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Priority to JP2016052587A priority Critical patent/JP6724443B2/en
Publication of JP2017164986A publication Critical patent/JP2017164986A/en
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Publication of JP6724443B2 publication Critical patent/JP6724443B2/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
    • B29C66/80—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
    • B29C66/812—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8126—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 composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/81261—Thermal properties, e.g. thermal conductivity, thermal expansion coefficient
    • 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
    • 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
    • B29C65/1658—Laser beams characterised by the way of heating the interface scanning at least one of the parts to be joined scanning once, e.g. contour 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
    • 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
    • B29C65/1664—Laser beams characterised by the way of heating the interface making use of several radiators
    • 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
    • B29C65/44—Joining a heated non plastics element to a plastics element
    • 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
    • B29C66/00141—Protective gases
    • 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
    • B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
    • B29C66/024—Thermal pre-treatments
    • B29C66/0242—Heating, or preheating, e.g. drying
    • 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
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • 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
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • 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
    • B29C66/73111—Thermal expansion coefficient
    • B29C66/73112—Thermal expansion coefficient of different thermal expansion coefficient, i.e. the thermal expansion coefficient of one of the parts to be joined being different from the thermal expansion coefficient of the other part
    • 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
    • B29C66/74—Joining plastics material to non-plastics material
    • B29C66/742—Joining plastics material to non-plastics material to metals or their alloys
    • 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
    • B29C66/91441—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
    • B29C66/91445—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 by steps
    • 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
    • B29C66/9161—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
    • 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
    • B29C66/919—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
    • B29C66/91921—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
    • 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
    • B29C66/919—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
    • B29C66/91921—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
    • B29C66/91941—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 Tg, i.e. the glass transition temperature, 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
    • 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
    • B29C66/919—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
    • B29C66/91921—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
    • B29C66/91941—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 Tg, i.e. the glass transition temperature, of the material of one of the parts to be joined
    • B29C66/91943—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 Tg, i.e. the glass transition temperature, of the material of one of the parts to be joined higher than said glass transition temperature
    • 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
    • B29C66/919—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
    • B29C66/91921—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
    • B29C66/91941—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 Tg, i.e. the glass transition temperature, of the material of one of the parts to be joined
    • B29C66/91945—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 Tg, i.e. the glass transition temperature, of the material of one of the parts to be joined lower than said glass transition temperature
    • 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
    • B29C65/1603—Laser beams characterised by the type of electromagnetic radiation
    • B29C65/1612—Infrared [IR] radiation, e.g. by infrared lasers
    • B29C65/1616—Near infrared radiation [NIR], e.g. by YAG lasers
    • 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
    • B29C66/71—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
    • B29C66/712—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 the composition of one of the parts to be joined being different from the composition of the other part
    • 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
    • B29C66/73771—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 amorphous
    • 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
    • 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
    • B29C66/74—Joining plastics material to non-plastics material
    • B29C66/746—Joining plastics material to non-plastics material to inorganic materials not provided for in groups B29C66/742 - B29C66/744
    • B29C66/7461—Ceramics
    • 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
    • B29C66/74—Joining plastics material to non-plastics material
    • B29C66/746—Joining plastics material to non-plastics material to inorganic materials not provided for in groups B29C66/742 - B29C66/744
    • B29C66/7465—Glass
    • 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
    • B29C66/919—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
    • B29C66/91921—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
    • B29C66/91935—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 lower than said fusion temperature

Description

本発明は、樹脂部材と、当該樹脂部材とは線膨張率が異なる異種部材とのレーザ接合方法に関する。本発明は、特には、接合後の応力を緩和し、信頼性の高い接合が可能な樹脂部材と異種部材とのレーザ接合方法に関する。 The present invention relates to a laser joining method for joining a resin member and a different member having a linear expansion coefficient different from that of the resin member. The present invention particularly relates to a laser joining method for a resin member and a dissimilar member that relieves stress after joining and enables highly reliable joining.

樹脂材料と金属などの非樹脂材料との接合方法としては、従来から、リベット締結による機械的な固定方法が用いられてきた。この方法は、現在でも主流ではあるが、締結部にある程度の大きさ及び重量があるため、部品の大型化・重量化が避けられず、設計の自由度も低下する。このため、大型あるいは単純な部材に適用が限定されていた。 As a method of joining a resin material and a non-resin material such as metal, a mechanical fixing method by rivet fastening has been used conventionally. This method is still mainstream at present, but since the fastening portion has a certain size and weight, it is unavoidable that the parts become large and heavy, and the degree of freedom in design also decreases. Therefore, its application is limited to large-sized or simple members.

接着剤により、樹脂材料と金属材料を接合する方法も知られている。これは、物理的吸着力及び化学的吸着力により、両材料を固定する方法である。接着剤を用いた方法では、接着剤が濡れ広がるため、精密なピンポイントな接合が難しい場合があった。また、接着剤の硬化に時間を要するため、生産性や管理においても課題が存在する。 A method of joining a resin material and a metal material with an adhesive is also known. This is a method of fixing both materials by a physical adsorption force and a chemical adsorption force. In the method using an adhesive, the adhesive spreads wet, which may make precise pinpoint bonding difficult. Further, since it takes time to cure the adhesive, there are problems in productivity and management.

近年、レーザを用いて、樹脂材料と金属材料とを接合する方法が提案されてきている。レーザ光源を用いて金属材料と、樹脂材料とを合わせた状態で接合部の樹脂材料に特定の大きさの気泡を発生させる温度まで加熱することにより金属材料と樹脂材料を接合する方法が提案されている（例えば、特許文献１を参照）。 In recent years, a method of joining a resin material and a metal material using a laser has been proposed. A method of joining a metal material and a resin material by heating the metal material and the resin material in a combined state using a laser light source to a temperature at which bubbles of a specific size are generated in the resin material of the joint is proposed. (See, for example, Patent Document 1).

樹脂材料を溶融させる温度に加熱する樹脂溶融用レーザ光源と樹脂材料を分解させる温度に加熱する樹脂分解用レーザ光源を使用する、複数のレーザ光源を用いて、金属材料と樹脂材料とを接合する方法も提案されている（特許文献２）。 A metal material and a resin material are joined using a plurality of laser light sources using a resin melting laser light source that heats a resin material to a melting temperature and a resin decomposition laser light source that heats to a temperature that decomposes a resin material. A method has also been proposed (Patent Document 2).

国際公開2007/029440International publication 2007/029440 特許第4873482号公報Japanese Patent No.4873482

レーザを用いる接合方法では、従来の機械的固定方法による制約や、接着剤を用いる方法による生産性の問題は解消しうる。しかしながら、特許文献１に提案されている方法では、接合部の局所的な加熱及び急激な冷却により、冷却後の樹脂材料に過剰な残留応力が発生する。このため、接合部及び近傍加熱部の樹脂材料の強度低下を引き起こし、十分な接合強度が得られないことが問題となる。またこの方法では、接合部及び近傍加熱部の樹脂材料内部に特定の大きさの気泡を発生させる。これにより、実接合面積の低下及び接合部の劣化を招くおそれがあり、やはり十分な接合強度が得ることができない。 The joining method using a laser can solve the problems of the conventional mechanical fixing method and the productivity problem of the method using an adhesive. However, in the method proposed in Patent Document 1, excessive residual stress is generated in the resin material after cooling due to local heating and rapid cooling of the joint. For this reason, the strength of the resin material in the joint portion and the vicinity heating portion is reduced, and a sufficient joint strength cannot be obtained, which is a problem. Further, in this method, bubbles of a specific size are generated inside the resin material of the joint portion and the neighborhood heating portion. As a result, the actual bonding area may be reduced and the bonding portion may be deteriorated, and sufficient bonding strength cannot be obtained.

特許文献２に提案された方法においては、溶融温度以上に樹脂を加熱する必要がある。このため、接合後に気泡が残存し、この気泡が接合性の低下を招く原因となっていた。 In the method proposed in Patent Document 2, it is necessary to heat the resin above the melting temperature. For this reason, air bubbles remain after joining, and this air bubble causes a decrease in bondability.

このように、従来のレーザを用いた樹脂部材と、金属部材などの異種部材との接合方法は、接合性、信頼性に劣っているため、実用化には至っていない。レーザを用いた、より信頼性の高い接合方法が求められる。 As described above, the conventional method of joining a resin member using a laser and a dissimilar member such as a metal member is inferior in bondability and reliability, and thus has not been put into practical use. A more reliable joining method using a laser is required.

本発明者らは、樹脂部材と当該樹脂部材とは線膨張率の異なる異種部材とをレーザ接合するにあたって、レーザにより樹脂部材を溶融し、さらに他のレーザを用いて樹脂部材の応力を緩和することに想到し、本発明を完成するに至った。 The inventors of the present invention, when laser-bonding a resin member and a dissimilar member having a different linear expansion coefficient to the resin member, melt the resin member with a laser and further relax the stress of the resin member using another laser. This led to the completion of the present invention.

すなわち、本発明は、一実施形態によれば、レーザ接合方法であって、樹脂部材と、前記樹脂部材と線膨張率が異なる異種部材とを接触させた状態で、接触部における前記樹脂部材を溶融させる温度に加熱する溶融用レーザ光を照射する工程と、前記樹脂部材を軟化させる温度に加熱する軟化用レーザ光を照射する工程とを含み、前記溶融用レーザ光の照射面積が、前記軟化用レーザ光の照射面積よりも小さい、レーザ接合方法に関する。 That is, the present invention is, according to one embodiment, a laser bonding method, in which a resin member and a different member having a different linear expansion coefficient from the resin member are brought into contact with each other, It includes a step of irradiating a melting laser beam to be heated to a melting temperature, and a step of irradiating a softening laser beam to be heated to a temperature to soften the resin member, the irradiation area of the melting laser beam is the softening. TECHNICAL FIELD The present invention relates to a laser joining method that is smaller than an irradiation area of a laser beam for use.

前記レーザ接合方法において、前記樹脂部材を溶融させる温度が、前記樹脂部材を軟化させる温度よりも高いことが好ましい。 In the laser bonding method, the temperature at which the resin member is melted is preferably higher than the temperature at which the resin member is softened.

前記レーザ接合方法において、前記溶融用レーザ光を照射する工程の後に、前記軟化用レーザ光を照射する工程を実施することが好ましい。 In the laser bonding method, it is preferable to perform the step of irradiating the softening laser light after the step of irradiating the melting laser light.

前記レーザ接合方法において、前記異種部材が、金属またはセラミクスであることが好ましい。 In the laser bonding method, it is preferable that the dissimilar member is metal or ceramics.

前記レーザ接合方法において、前記樹脂部材が、熱可塑性樹脂であることが好ましい。 In the laser bonding method, it is preferable that the resin member is a thermoplastic resin.

前記レーザ接合方法における、前記溶融用レーザ光を照射する工程と、前記軟化用レーザ光を照射する工程とにおいて、前記異種部材側からレーザを照射することが好ましい。 In the laser joining method, in the step of irradiating the melting laser light and the step of irradiating the softening laser light, it is preferable to irradiate the laser from the different member side.

本発明は別の局面によれば、樹脂部材と、異種部材との接合体であって、前述のいずれかの接合方法により製造された接合体である。 According to another aspect of the present invention, there is provided a joined body of a resin member and a dissimilar member, which is produced by any one of the joining methods described above.

本発明は別の実施形態によれば、レーザ接合装置であって、樹脂部材を溶融させる温度に加熱する溶融用レーザと、樹脂部材を軟化させる温度に加熱する軟化用レーザとを備えてなる。 According to another embodiment of the present invention, there is provided a laser bonding apparatus including a melting laser for heating a resin member to a temperature for melting and a softening laser for heating a resin member to a temperature for softening the resin member.

本発明の接合方法によれば、樹脂部材をレーザ照射により溶融させ、かつレーザ照射により樹脂部材の応力を緩和させることで、気泡などを生じさせることなく、樹脂部材と異種部材との高い強度の接合部を均一に形成することができる。本発明の接合方法は、樹脂部材の加熱場所及び加熱温度の制御が極めて容易かつ効率的であり、結果として信頼性の高い、樹脂部材と異種部材との接合体を得ることができる。 According to the joining method of the present invention, the resin member is melted by laser irradiation, and the stress of the resin member is relaxed by laser irradiation, so that high strength of the resin member and the dissimilar member can be obtained without generating bubbles or the like. The joint can be formed uniformly. According to the joining method of the present invention, the control of the heating location and heating temperature of the resin member is extremely easy and efficient, and as a result, a highly reliable joined body of the resin member and the dissimilar member can be obtained.

図１は、本発明の一実施形態による接合方法を、模式的に示す図である。FIG. 1 is a diagram schematically showing a joining method according to an embodiment of the present invention.

以下に、図面を参照して本発明の実施の形態を説明する。しかし、本発明は、以下に説明する実施の形態によって限定されるものではない。また、図面は本発明を説明するための例示的な概略図であって、各部材の寸法や相対的な関係は、本発明を限定するものではない。 Embodiments of the present invention will be described below with reference to the drawings. However, the present invention is not limited to the embodiments described below. In addition, the drawings are exemplary schematic diagrams for explaining the present invention, and the dimensions and relative relationships of each member do not limit the present invention.

本発明は、一実施形態によれば、樹脂部材と、当該樹脂部材とは線膨張率が異なる異種部材とのレーザ接合方法に関する。本実施形態において、被加工物となる一方の部材は、樹脂部材である。この樹脂部材は、加熱により流動化する樹脂、または樹脂前駆体、あるいはこれらの混合物であってよい。このような樹脂部材としては、例えば、ナイロン６（ＰＡ６）やナイロン６６（ＰＡ６６）等のポリアミド樹脂（ＰＡ）、ポリエチレンテレフタレート（ＰＥＴ）やポリブチレンテレフタレート（ＰＢＴ）等のポリエステル樹脂、ポリカーボネート（ＰＣ）樹脂、ポリスチレンやＡＢＳ等のスチレン系樹脂、アクリル系樹脂（ＰＭＭＡ等）等の熱可塑性樹脂が挙げられるが、これらには限定されない。特に主鎖、側鎖及び／または末端に極性基もしくは金属、セラミクス、ガラス等と反応性を有する基を有する樹脂材料が好ましく、ポリアミド樹脂（ＰＡ）、ポリエステル樹脂、ポリカーボネート（ＰＣ）や、カルボン酸基やスルホン酸金属塩基などの極性基もしくは金属、セラミクス、ガラス等と反応性を有する基を側鎖及び／または末端に有するスチレン系樹脂、アクリル系樹脂等が好ましい。特に主鎖、側鎖及び／または末端に極性基もしくは金属、セラミクス、ガラス等と反応性を有する基を有する非晶性樹脂からなる樹脂部材が好ましい。 According to one embodiment, the present invention relates to a laser joining method for joining a resin member and a different member having a linear expansion coefficient different from that of the resin member. In the present embodiment, one member to be the workpiece is a resin member. The resin member may be a resin fluidized by heating, a resin precursor, or a mixture thereof. Examples of such resin members include polyamide resins (PA) such as nylon 6 (PA6) and nylon 66 (PA66), polyester resins such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), and polycarbonate (PC). Examples thereof include, but are not limited to, resins, styrene resins such as polystyrene and ABS, and thermoplastic resins such as acrylic resins (PMMA, etc.). In particular, a resin material having a polar group or a group having reactivity with a metal, ceramics, glass or the like in a main chain, a side chain and/or a terminal is preferable, and a polyamide resin (PA), a polyester resin, a polycarbonate (PC) or a carboxylic acid. A styrene resin, an acrylic resin or the like having a group or a polar group such as a metal sulfonate group or a group having a reactivity with a metal, ceramics, glass or the like in a side chain and/or a terminal is preferable. Particularly, a resin member made of an amorphous resin having a polar group or a group having reactivity with a metal, ceramics, glass or the like in the main chain, side chains and/or terminals is preferable.

また、樹脂部材は構成原子中に酸素が存在すると、特に金属の場合は、表面の酸化物と容易に化学結合を形成して高い接合強度が得られるので好ましい。本発明における樹脂部材は、樹脂のみからなるものであってもよく、樹脂に、ガラス繊維、カーボン繊維等の補強繊維や、シリカ、アルミナ、二酸化チタン、マイカなどの無機充填剤、着色材、熱安定剤、光安定剤、難燃剤等の各種添加剤を添加したものであってもよい。 In addition, it is preferable that oxygen is present in the resin member as constituent atoms, particularly in the case of a metal, because a chemical bond is easily formed with the oxide on the surface to obtain high bonding strength. The resin member in the present invention may be made of only a resin, and the resin includes a reinforcing fiber such as glass fiber and carbon fiber, and an inorganic filler such as silica, alumina, titanium dioxide and mica, a coloring material, and heat. What added various additives, such as a stabilizer, a light stabilizer, and a flame retardant, may be used.

樹脂部材は、その厚さや形状も特には限定されないが、重ね接合する箇所において、例えば５０μｍ以上であって、１０ｍｍ程度までの部材、特には板材を一般的に用いることができる。 The thickness and shape of the resin member are not particularly limited, but a member having a thickness of, for example, 50 μm or more and up to about 10 mm, particularly a plate member, can be generally used at the portion to be overlapped and joined.

本実施形態において、接合対象となる他方の部材は、上記樹脂部材とは線膨張率が異なる部材である。本明細書において、この部材を、異種部材と指称する。異種部材としては、金属部材、セラミクス部材、ガラス、及び、上記樹脂部材とは異なる樹脂部材等が挙げられる。 In the present embodiment, the other member to be joined has a coefficient of linear expansion different from that of the resin member. In this specification, this member is referred to as a different member. Examples of the dissimilar member include a metal member, a ceramic member, glass, and a resin member different from the above resin member.

金属部材としては、鉄、アルミニウム、チタン、銅、またはこれらを含む合金が挙げられるが、特に限定されない。金属部材は、表面に母材とは異なる金属の皮膜を備えるものであってもよい。金属部材は、特には、樹脂部材との接合力を高めるための表面処理を行ったものが好ましい。このような表面処理としては、粗面化処理が挙げられるが、特定の表面処理法によるものには限定されない。 Examples of the metal member include iron, aluminum, titanium, copper, and alloys containing these, but are not particularly limited. The metal member may have a surface coated with a metal film different from the base material. It is particularly preferable that the metal member has been subjected to a surface treatment for increasing the bonding force with the resin member. Examples of such surface treatment include roughening treatment, but are not limited to those by a specific surface treatment method.

セラミクス部材としては、アルミナ、ジルコニア、チタニア、酸化亜鉛、炭化ケイ素、窒化ケイ素、窒化ホウ素、窒化アルミニウム、チタン酸バリウム、フェライトが挙げられるが、これらには限定されない。また、任意の種類のガラスも本実施形態による接合対象とすることができる。さらには、接合対象は、一方の樹脂とは線膨張率が異なる別の樹脂であってもよい。 Examples of the ceramics member include, but are not limited to, alumina, zirconia, titania, zinc oxide, silicon carbide, silicon nitride, boron nitride, aluminum nitride, barium titanate, and ferrite. In addition, any type of glass can be a bonding target according to the present embodiment. Further, the bonding target may be another resin having a linear expansion coefficient different from that of one resin.

金属部材、セラミクス部材、ガラス、樹脂などの異種部材の厚さや形状も特には限定されないが、例えば０．１ｍｍ以上であって、１０ｍｍ程度の部材、特には板材を一般的に用いることができる。 The thickness and shape of different members such as a metal member, a ceramic member, glass, and a resin are not particularly limited, but a member having a thickness of, for example, 0.1 mm or more and about 10 mm, particularly a plate member can be generally used.

本実施形態において、樹脂部材と、異種部材とは、重ね溶接により接合することができる。したがって、例えば板状の樹脂部材と、板状の異種部材とが、面で接触するように重ね合わせた状態で、レーザ溶接する。図１を参照して、樹脂部材と、異種部材の一例である金属部材との接合方法について具体的に説明する。 In the present embodiment, the resin member and the dissimilar member can be joined by lap welding. Therefore, for example, the plate-shaped resin member and the plate-shaped dissimilar member are laser-welded in a state of being superposed so as to be in contact with each other. A method for joining a resin member and a metal member, which is an example of a different type member, will be specifically described with reference to FIG. 1.

図１は、板状の樹脂部材と異種部材とを重ね合わせた箇所における、溶接方向ｄに平行な断面を模式的に示している。図１において、樹脂部材４１は、金属部材４２と重ね合わせられ、接触した状態で、試料台３に載置され、好ましくは試料台３に固定されている。重ね合わせられた樹脂部材４１と金属部材４２とを、以下、本明細書において、被加工物４と指称する場合もある。そして、被加工物４のうち、金属部材４２に対向して、溶融用レーザ１と軟化用レーザ２とが配設されている。これらの溶融用レーザ１と軟化用レーザ２とは、本発明の方法に用いるレーザ接合装置を構成する。 FIG. 1 schematically shows a cross section parallel to the welding direction d in a portion where a plate-shaped resin member and a dissimilar member are overlapped. In FIG. 1, the resin member 41 is placed on the sample table 3 in a state of being overlapped with and in contact with the metal member 42, and preferably fixed to the sample table 3. Hereinafter, the resin member 41 and the metal member 42 that are overlapped with each other may be referred to as the workpiece 4 in this specification. Then, the melting laser 1 and the softening laser 2 are arranged facing the metal member 42 of the workpiece 4. The melting laser 1 and the softening laser 2 constitute a laser joining device used in the method of the present invention.

溶融用レーザ１は、樹脂部材４１を溶融させる温度に加熱するレーザ装置である。溶融用レーザ１は、主として、レーザヘッド１２と集光レンズ１３とガスノズル１４とから構成され、被加工物４に溶融用レーザ光１１を照射する。ガスノズル１４は実施形態により、存在しない場合もある。一方、軟化用レーザ２は、樹脂部材４１を軟化させる温度に加熱するレーザ装置である。軟化用レーザ２は、主として、レーザヘッド２２と集光レンズ２３とから構成することができ、被加工物４に軟化用レーザ光２１を照射する。任意選択的に、軟化用レーザ２にもガスノズルを備えていてもよい。 The melting laser 1 is a laser device that heats the resin member 41 to a temperature at which it is melted. The melting laser 1 mainly includes a laser head 12, a condenser lens 13, and a gas nozzle 14, and irradiates the workpiece 4 with the melting laser light 11. The gas nozzle 14 may not be present depending on the embodiment. On the other hand, the softening laser 2 is a laser device that heats the resin member 41 to a temperature at which it softens. The softening laser 2 can mainly be composed of a laser head 22 and a condenser lens 23, and irradiates the workpiece 4 with the softening laser light 21. Optionally, the softening laser 2 may also be equipped with a gas nozzle.

溶融用レーザ１、軟化用レーザ２としては、例えば、ＹＡＧレーザ、ファイバレーザ、エキシマレーザ等のレーザ装置を用いることができる。これらのレーザ装置は同一の仕様であってもよく、異なる仕様であってもよい。特に、軟化用レーザ２としては、樹脂部材４１での吸収率が高くなるエキシマレーザ等の紫外光レーザを用いてもよい。このような態様は、図示する実施形態とは異なり、金属部材が試料台に接していて樹脂部材側にレーザ照射する場合において、特に好ましい。紫外光レーザは、樹脂部材を選択的に加熱制御するために有用だからである。また、溶融用レーザ１と軟化用レーザ２は、別個の光源を用意するのではなく、同一のレーザ光源からスプリッタ、ミラーを利用して、分岐し、それぞれの光源として用いる態様であってもよい。 As the melting laser 1 and the softening laser 2, for example, a laser device such as a YAG laser, a fiber laser, or an excimer laser can be used. These laser devices may have the same specifications or different specifications. In particular, as the softening laser 2, an ultraviolet light laser such as an excimer laser having a high absorption rate in the resin member 41 may be used. Unlike the illustrated embodiment, such an aspect is particularly preferable when the metal member is in contact with the sample table and the resin member side is irradiated with the laser. This is because the ultraviolet laser is useful for selectively heating and controlling the resin member. Further, the melting laser 1 and the softening laser 2 do not have to be prepared as separate light sources, but may be branched from the same laser light source using a splitter and a mirror and used as respective light sources. ..

樹脂部材４１と金属部材４２とは、相互に重ね合され、固定された状態のまま、溶融用レーザ１と軟化用レーザ２に対して、相対的に移動可能に配設される。例えば、溶融用レーザ１と軟化用レーザ２が固定され、試料台３が溶融用レーザ１と軟化用レーザ２に対し、図中の溶接方向ｄの向きに移動する構成としてもよい。あるいは、試料台３が固定され、溶融用レーザ１と軟化用レーザ２が試料台３に対し、図中の溶接方向ｄと逆向きに移動する構成としてもよい。あるいは、溶融用レーザ１及び軟化用レーザ２と、試料台３と両方を相対的に移動する構成としてもよい。 The resin member 41 and the metal member 42 are disposed so as to be relatively movable with respect to the melting laser 1 and the softening laser 2 while being fixed to each other while being overlapped with each other. For example, the melting laser 1 and the softening laser 2 may be fixed, and the sample stage 3 may be moved in the welding direction d in the figure with respect to the melting laser 1 and the softening laser 2. Alternatively, the sample stage 3 may be fixed, and the melting laser 1 and the softening laser 2 may move in the direction opposite to the welding direction d in the figure with respect to the sample stage 3. Alternatively, both the melting laser 1 and the softening laser 2 and the sample stage 3 may be relatively moved.

本実施形態における方法においては、樹脂部材４１と金属部材４２との接触部（界面）４３における前記樹脂部材４１を溶融させる温度に加熱する溶融用レーザ光１１を照射する工程と、前記樹脂部材４１を軟化させる温度に加熱する軟化用レーザ光２１を照射する工程とを含む。 In the method of the present embodiment, a step of irradiating the melting laser beam 11 for heating the resin member 41 at a contact portion (interface) 43 between the resin member 41 and the metal member 42 to a temperature for melting the resin member 41, and the resin member 41. Irradiating with the softening laser beam 21 for heating to a temperature for softening.

樹脂部材４１を溶融させる温度（以下、溶融温度とも指称する）は、樹脂部材４１と金属部材４２との界面４３、及び樹脂部材４１の内部に溶融部分を発生させる温度であることが必要である。具体的には樹脂部材４１を構成する樹脂の軟化温度より高く、樹脂の主鎖が分解、低分子化し、劣化する温度未満であることが好ましい。また、溶融温度は、樹脂の過剰な気泡発生を伴うような高い温度にしないことが好ましい。樹脂中に過剰な気泡が発生すると、接合部における実接合面積の減少、及び前記樹脂の劣化による接合強度低下が発生ためである。溶融温度は、樹脂部材４１を構成する材料より異なるため、本発明の方法を実施する前に、事前実験をして決定することができる。 The temperature at which the resin member 41 is melted (hereinafter, also referred to as a melting temperature) needs to be a temperature at which a molten portion is generated in the interface 43 between the resin member 41 and the metal member 42 and inside the resin member 41. .. Specifically, it is preferably higher than the softening temperature of the resin constituting the resin member 41, and lower than the temperature at which the main chain of the resin decomposes and lowers its molecular weight to deteriorate. Further, it is preferable that the melting temperature is not a high temperature which causes the generation of excessive bubbles in the resin. This is because when excessive bubbles are generated in the resin, the actual bonding area at the bonding portion is reduced and the bonding strength is reduced due to deterioration of the resin. Since the melting temperature differs depending on the material forming the resin member 41, it can be determined by performing a preliminary experiment before carrying out the method of the present invention.

溶融用レーザ光１１を照射する際の照射条件は、樹脂を適切な溶融温度にすることができれば特には限定されないが、比較的狭い範囲で樹脂を溶融して溶融状態にすることができる照射条件を適宜設定することが好ましい。したがって、レーザのパワー、パワー密度、加工速度（移動速度）や焦点はずし距離等の照射条件は、目的に応じて適宜設定可能である。例えば、溶融用レーザ光１１のパワー密度は、５Ｗ／ｍｍ２以下が好ましいがこの条件には限定されない。レーザの焦点はずし距離を大きくすると、パワー密度が小さくなるため、それをカバーする大きなパワーのレーザを照射することができ、その結果広い条件範囲で良好な接合部が得られ、制御が容易である。溶融用レーザ光１１の照射は、連続照射であってもよく、パルス照射であってもよいが、被加工物４に対して、レーザ光１１を一方向に走査することにより、あるいは、接合面のＸＹ方向に走査することにより重ね接合を行う。溶融用レーザ光１１を照射する際に、窒素ガスやアルゴンガスなどの不活性ガスからなるシールドガスｇを吹き付けてもよい。これにより、酸化防止といった効果が得られる。 The irradiation conditions for irradiating the melting laser beam 11 are not particularly limited as long as the resin can be melted at an appropriate melting temperature, but it is possible to melt the resin in a relatively narrow range to bring it into a molten state. Is preferably set appropriately. Therefore, the irradiation conditions such as laser power, power density, processing speed (moving speed) and defocusing distance can be appropriately set according to the purpose. For example, the power density of the melting laser light 11 is preferably 5 W/mm 2 or less, but is not limited to this condition. When the defocusing distance of the laser is increased, the power density becomes smaller, so it is possible to irradiate a laser with high power to cover it, and as a result, a good joint can be obtained in a wide range of conditions and control is easy. .. Irradiation of the melting laser beam 11 may be continuous irradiation or pulse irradiation, but the laser beam 11 may be scanned in one direction with respect to the workpiece 4, or the bonding surface may be irradiated. Lap bonding is performed by scanning in the XY directions. When irradiating the melting laser beam 11, a shield gas g made of an inert gas such as nitrogen gas or argon gas may be blown. Thereby, the effect of preventing oxidation can be obtained.

軟化させる温度（以下、軟化温度とも指称）は、溶融温度よりも低い温度であって、樹脂部材４１を構成する樹脂のガラス転移点(Ｔｇ)よりも高い温度である。軟化温度も樹脂部材４１を構成する材料より異なり、事前実験により決定することができる。このような軟化温度は、界面４３での応力緩和を可能にする。 The temperature for softening (hereinafter, also referred to as softening temperature) is a temperature lower than the melting temperature and higher than the glass transition point (Tg) of the resin forming the resin member 41. The softening temperature also differs depending on the material forming the resin member 41, and can be determined by preliminary experiments. Such a softening temperature enables stress relaxation at the interface 43.

軟化用レーザ光２１を照射する際の照射条件も、レーザ光２１の照射により樹脂を軟化して応力緩和に好適な照射条件を適宜設定することができ、軟化用レーザ光２１の照射条件は、特定の条件には限定されない。軟化用レーザ光２１のパワー密度は、５Ｗ／ｍｍ２以下とすることが好ましいがこの条件には限定されない。また、軟化用レーザ光２１の照射も、連続照射であってもよく、パルス照射であってもよい。また、軟化用レーザ光２１を照射する際にも、加熱したシールドガスを吹き付けてもよい。軟化用レーザ光２１とともに、樹脂部材４１の軟化に寄与し、樹脂部材４１の応力緩和効果が得られるためである。 Regarding the irradiation conditions when irradiating the softening laser light 21, it is possible to appropriately set irradiation conditions suitable for stress relaxation by softening the resin by the irradiation of the laser light 21, and the irradiation conditions of the softening laser light 21 are as follows: It is not limited to specific conditions. The power density of the softening laser light 21 is preferably 5 W/mm 2 or less, but is not limited to this condition. Irradiation of the softening laser beam 21 may be continuous irradiation or pulse irradiation. Further, when the softening laser beam 21 is applied, the heated shield gas may be blown. This is because, together with the softening laser beam 21, it contributes to softening of the resin member 41 and the stress relaxation effect of the resin member 41 is obtained.

溶融用レーザ光１１を照射する工程と、軟化用レーザ光２１を照射する工程とは、溶融用レーザ光１１の照射面積が、前記軟化用レーザ光２１の照射面積よりも小さくなるように、各レーザの照射条件を設定する。これによって、所望の場所に高い接合強度を有する接合部を作り出すことができるためである。熱応力は樹脂の結晶融点、すなわち流動可能な温度に依存し、流動可能な温度が高い程、熱応力は大きくなる。また、金属部材４２（他の実施形態においては、セラミクス、ガラス、他の樹脂などの異種部材）と樹脂部材４１の熱膨張係数の差にも依存し、熱膨張係数の差が大きい程、熱応力は大きくなるため、これら樹脂の熱特性に応じて、照射面積を適宜設定することが必要である。軟化用レーザ光２１の照射面積を設定する際には、レーザの焦点はずし距離によって照射面積を設定できる。またレーザ光２１の照射角度を変更し、照射面のビームスポット形状を楕円形に変更することでも照射面積を設定することができる。さらにレーザ光２１の焦点はずし距離と照射角度を両方変更することでも照射面積を設定できる。 Each of the step of irradiating the melting laser light 11 and the step of irradiating the softening laser light 21 is performed such that the irradiation area of the melting laser light 11 is smaller than the irradiation area of the softening laser light 21. Set the laser irradiation conditions. This is because a joint having high joint strength can be created at a desired place. The thermal stress depends on the crystalline melting point of the resin, that is, the flowable temperature, and the higher the flowable temperature, the greater the thermal stress. Further, depending on the difference in the coefficient of thermal expansion between the metal member 42 (in another embodiment, a heterogeneous member such as ceramics, glass, or another resin) and the resin member 41, the greater the difference in the coefficient of thermal expansion, the greater the heat Since the stress increases, it is necessary to set the irradiation area appropriately according to the thermal characteristics of these resins. When setting the irradiation area of the softening laser beam 21, the irradiation area can be set by the defocusing distance of the laser. The irradiation area can also be set by changing the irradiation angle of the laser light 21 and changing the beam spot shape of the irradiation surface to an elliptical shape. Further, the irradiation area can be set by changing both the defocusing distance and the irradiation angle of the laser light 21.

溶融用レーザ光１１を照射する工程と軟化用レーザ光２１を照射する工程は、同時に行ってもよい。溶融用レーザ光１１を照射する工程と軟化用レーザ光２１を照射する工程を同時に行うとは、被加工物４上のある部位に、溶融用レーザ光１１と軟化用レーザ光２１を同時に照射することをいう。前述のように、本発明において、溶融用レーザ光１１と軟化用レーザ光２１では照射面積が異なるため、軟化用レーザ光２１のスポット内に、溶融用レーザ光１１のスポットがある場合に、同時であるといえる。 The step of irradiating the melting laser beam 11 and the step of irradiating the softening laser beam 21 may be performed at the same time. Performing the step of irradiating the melting laser beam 11 and the step of irradiating the softening laser beam 21 at the same time means irradiating a certain portion on the workpiece 4 with the melting laser beam 11 and the softening laser beam 21 at the same time. Say that. As described above, in the present invention, since the irradiation areas of the melting laser light 11 and the softening laser light 21 are different, when the spot of the melting laser light 11 exists in the spot of the softening laser light 21, it is possible to simultaneously You can say that.

あるいは溶融用レーザ光１１を照射する工程後に、軟化用レーザ光２１を照射する工程を実施してもよい。溶融用レーザ光１１を照射する工程後に、軟化用レーザ光２１を照射する工程を実施するとは、被加工物４上のある部位に溶融用レーザ光１１を照射した後、所定の時間後に同じ部位に軟化用レーザ光２１を照射することをいう。この場合、その時間差は特には限定されない。溶融用レーザ光１１を照射した後、金属部材４２と接触している樹脂部材４１がガラス転移点以上になっている状態で、軟化用レーザ光２１を照射してもよい。あるいは、樹脂部材４１が溶融した後、ガラス転移点以下の温度にまで温度が下降した後において軟化用レーザ光２１を照射してもよい。 Alternatively, the step of irradiating the softening laser light 21 may be performed after the step of irradiating the melting laser light 11. Carrying out the step of irradiating the softening laser light 21 after the step of irradiating the melting laser light 11 means that after irradiating a certain portion on the workpiece 4 with the melting laser light 11, the same portion after a predetermined time. It means irradiating the softening laser beam 21 on the surface. In this case, the time difference is not particularly limited. After irradiating the melting laser beam 11, the softening laser beam 21 may be radiated while the resin member 41 in contact with the metal member 42 has a glass transition point or higher. Alternatively, after the resin member 41 is melted, the softening laser beam 21 may be irradiated after the temperature has dropped to a temperature below the glass transition point.

なお、図示する実施形態においては、金属部材４２側からレーザ光１１、２１の照射を行っているが、レーザ光１１、２１の照射は、いずれの部材側から行っても強固な接合部を形成することができる。金属側からレーザ照射を行った場合は樹脂のレーザ吸収率に影響を受けず所定の加熱状態とすることが容易なため、より有利な場合がある。すなわち、樹脂部材の色調等に制限はなく、ガラス繊維、カーボン繊維等の補強繊維や着色材、熱安定剤、光安定剤等を添加した樹脂部材の接合においても、用いることができる。 In the illustrated embodiment, the laser beams 11 and 21 are irradiated from the metal member 42 side, but the laser beams 11 and 21 are irradiated from any member side to form a strong joint portion. can do. When laser irradiation is performed from the metal side, there is a case where it is more advantageous because it is easy to obtain a predetermined heating state without being affected by the laser absorption rate of the resin. That is, the color tone of the resin member is not limited, and the resin member can also be used for joining resin members to which reinforcing fibers such as glass fibers and carbon fibers, coloring materials, heat stabilizers, and light stabilizers are added.

また、軟化用レーザ光２１として、複数に分岐したレーザ光を用い、レーザの走査線上に並べて照射することで、応力緩和時間を長く設定することもできる。すなわち、金属部材４２上のある一点に着目すると、溶融用レーザ光２１が照射された後、複数の別個の軟化用レーザ光２１が、順に照射される態様となる。 Further, the stress relaxation time can be set to be long by using a plurality of branched laser beams as the softening laser beam 21 and irradiating them side by side on the scanning line of the laser. That is, focusing on a certain point on the metal member 42, after the melting laser light 21 is irradiated, a plurality of separate softening laser lights 21 are sequentially irradiated.

従来、単一の照射位置に単一のレーザ光を用いて接合部の樹脂材料を加熱すると、パワー密度分布を適当に制御できない場合、レーザ照射部に過剰な気泡が発生したり、金属部材と樹脂部材との熱膨張差、及び急冷による応力緩和ができないことにより樹脂部材内の熱応力が発生したりして、高い接合強度を得られない場合があった。これに対し、本発明においては、接合部の樹脂部材の加熱場所と加熱温度を自在に制御して、溶融用レーザ光と軟化用レーザ光の少なくとも二つのレーザ光を使用することができる。これにより、接合に必要な部分の局所的な加熱、溶融と所望範囲の樹脂部材の軟化が可能になり、軟化に伴う応力緩和させることできる。そして、樹脂部材と金属などの異種部材とが、アンカー効果などの機械的な接合力及び／または金属などの酸化物を通した化学的な接合力により接合体を形成することができ、樹脂部材と異種部材との接合強度を向上させることができる。そして、本発明の方法によって金属部材と樹脂部材とが接合された複合体は、樹脂母材破断となり、樹脂母材と同等の強度を有する強固な接合部を有することができる。 Conventionally, when heating the resin material of the joint using a single laser beam at a single irradiation position, if the power density distribution cannot be controlled appropriately, excessive bubbles will be generated in the laser irradiation part, or a metal member In some cases, thermal stress in the resin member is generated due to the difference in thermal expansion from the resin member and the inability to relax stress due to rapid cooling, so that high joint strength cannot be obtained. On the other hand, in the present invention, it is possible to freely control the heating location and the heating temperature of the resin member at the joint, and to use at least two laser beams of the melting laser beam and the softening laser beam. As a result, it becomes possible to locally heat and melt the portion necessary for joining and soften the resin member in a desired range, and it is possible to relieve the stress associated with the softening. Then, the resin member and the dissimilar member such as a metal can form a joined body by a mechanical joining force such as an anchor effect and/or a chemical joining force through an oxide such as a metal. It is possible to improve the bonding strength between the different materials. Then, the composite body in which the metal member and the resin member are joined by the method of the present invention becomes a fracture of the resin base material and can have a strong joint portion having the same strength as the resin base material.

以下、実施例を用いて本発明をより詳細に説明する。しかし、実施例は本発明の実施形態の一例であって、本発明の方法は下記の実施例に限定されるものではない。 Hereinafter, the present invention will be described in more detail with reference to examples. However, the examples are examples of the embodiments of the present invention, and the method of the present invention is not limited to the following examples.

図１に示す構成の装置を用いて、本発明に係る接合を実施する。溶融用レーザ１光源として、波長１０３０〜１１００ｎｍの連続発振ファイバレーザ光を用い、軟化用レーザ２光源として、波長１０３０〜１１００ｎｍの連続発振ファイバレーザ光を用いる。レーザ光１１に関しては、レーザ加工ヘッド１２にレーザ光１１を導入し、被加工物の０．５ｍｍ厚のステンレス鋼ＳＵＳ３１６の上に、被加工物の２ｍｍのＰＡ６（ポリアミド６）薄板を重ねたものに照射する。溶融用レーザ光１１は、パワーが２５Ｗで、レンズ１３の焦点位置に対し、ビームスポット形状が、Φ４．０ｍｍの円形である状態で照射する。一方、軟化用レーザ２に関しては、レーザ加工ヘッド２２にレーザ光２１を導入し、パワーが６０Ｗで、ビームスポット形状が、Φ８．０ｍｍの円形である状態で照射する。試料台３を方向ｄに移動し、レーザ溶接速度７５ｍｍ／ｍｉｎとした。レーザ加工ヘッド１２に取り付けた直径６ｍｍのガスノズル１４から、シールドガスｇの窒素ガスを２０Ｌ／ｍｉｎで吹きかける。 The bonding according to the present invention is carried out using the apparatus having the configuration shown in FIG. As the melting laser 1 light source, continuous wave fiber laser light having a wavelength of 1030 to 1100 nm is used, and as the softening laser 2 light source, continuous wave fiber laser light having a wavelength of 1030 to 1100 nm is used. Regarding the laser beam 11, the laser beam 11 is introduced into the laser processing head 12, and a 2 mm PA6 (polyamide 6) thin plate of the workpiece is stacked on the stainless steel SUS316 of 0.5 mm thickness of the workpiece. To irradiate. The melting laser beam 11 has a power of 25 W and irradiates the focal position of the lens 13 in a state where the beam spot shape is a circle having a diameter of 4.0 mm. On the other hand, with respect to the softening laser 2, the laser beam 21 is introduced into the laser processing head 22, and irradiation is performed in a state where the power is 60 W and the beam spot shape is a circle of Φ8.0 mm. The sample stage 3 was moved in the direction d, and the laser welding speed was set to 75 mm/min. From the gas nozzle 14 with a diameter of 6 mm attached to the laser processing head 12, nitrogen gas of the shield gas g is sprayed at 20 L/min.

得られた接合体について、試験片の幅１０ｍｍでの引張せん断試験を実施すると、引張せん断強さは８ＭＰａ以上である。比較例として、軟化用レーザを照射しない以外はすべて同じ条件で接合した接合体を作製し、同条件で引張せん断試験を実施すると、引張せん断強さは８ＭＰａであることから、二種類のレーザ光を使用した方が高い接合強度が得られる。 When a tensile shear test is performed on the obtained joined body with a test piece having a width of 10 mm, the tensile shear strength is 8 MPa or more. As a comparative example, when a joined body is produced under the same conditions except that the softening laser is not irradiated, and a tensile shear test is performed under the same conditions, the tensile shear strength is 8 MPa. Higher bonding strength can be obtained by using.

本発明によるレーザ接合方法は、樹脂部材と、金属、セラミクス、ガラス、他の樹脂などの異種部材とを接合する種々の場面に使用することができる。特に、電気・電子機器分野を含む産業分野全般の設計や材料選択の自由度が増え、樹脂部材と異種部材の複合体を製造する上で極めて有用である。 The laser joining method according to the present invention can be used in various situations where a resin member is joined to a dissimilar member such as metal, ceramics, glass, or another resin. In particular, the degree of freedom in designing and selecting materials in all industrial fields including the fields of electric and electronic devices is increased, which is extremely useful for manufacturing a composite of a resin member and a different member.

１ 溶融用レーザ
１１ 溶融用レーザ光
１２ レーザヘッド
１３ 集光レンズ
１４ ガスノズル
２ 軟化用レーザ
２１ 軟化用レーザ光
２２ レーザヘッド
２３ 集光レンズ
３ 試料台
４ 被加工物
４１ 樹脂部材
４２ 金属部材（異種部材）
４３ 界面（接触部）
ｄ 接合進行方向
ｇ シールドガス 1 Melting Laser 11 Melting Laser Light 12 Laser Head 13 Condensing Lens 14 Gas Nozzle 2 Softening Laser 21 Softening Laser Light 22 Laser Head 23 Condensing Lens 3 Specimen 4 Workpiece 41 Resin Member 42 Metal Member (Dissimilar Member) )
43 Interface (contact part)
d Joining advancing direction g Shield gas

Claims (5)

樹脂部材と、前記樹脂部材と線膨張率が異なる異種部材とを接触させた状態で、接触部における前記樹脂部材を溶融させる温度に加熱する溶融用レーザ光を照射する工程と、
前記樹脂部材を軟化させる温度に加熱する軟化用レーザ光を照射する工程と
を含み、前記溶融用レーザの照射面積が、前記軟化用レーザの照射面積よりも小さく、前記異種部材が金属またはセラミクスである、異種部材のレーザ接合方法。 A step of irradiating a melting laser beam for heating the resin member to a temperature at which the resin member in the contact portion is melted in a state where the resin member and a different member having a different linear expansion coefficient from each other are in contact with each other;
Wherein heating the resin member to a temperature to soften and the step of irradiating the softened laser beam, the irradiation area of melting laser, the rather smaller than the irradiation area of the softening laser, said heterologous member metals or ceramics Which is a laser bonding method for dissimilar members. 樹脂部材と、前記樹脂部材と線膨張率が異なる異種部材とを接触させた状態で、接触部における前記樹脂部材を溶融させる温度に加熱する溶融用レーザ光を照射する工程と、
前記樹脂部材を軟化させる温度に加熱する軟化用レーザ光を照射する工程と
を含み、前記溶融用レーザの照射面積が、前記軟化用レーザの照射面積よりも小さく、前記溶融用レーザ光を照射する工程の後に、前記軟化用レーザ光を照射する工程を実施する、異種部材のレーザ接合方法。 A step of irradiating a melting laser beam for heating the resin member to a temperature at which the resin member in the contact portion is melted in a state where the resin member and a different member having a different linear expansion coefficient from each other are in contact with each other;
And a step of irradiating the softened laser light to heat to a temperature of softening the resin member, the irradiation the irradiation area of melting laser, the rather smaller than the irradiation area of the softening laser, the molten laser beam A laser joining method for different kinds of members , wherein the step of irradiating the softening laser beam is performed after the step of performing . 前記樹脂部材を溶融させる温度が、前記樹脂部材を軟化させる温度よりも高い、請求項１または２に記載のレーザ接合方法。 The temperature at which the resin member is melted is higher than the temperature for softening the resin member, a laser bonding method according to claim 1 or 2. 前記樹脂部材が熱可塑性樹脂である、請求項１〜３のいずれか１項に記載の方法。 The resin member is a thermoplastic resin, the method according to any one of claims 1-3. 前記溶融用レーザ光を照射する工程と、前記軟化用レーザ光を照射する工程とにおいて、前記異種部材側からレーザを照射する、請求項１〜４のいずれか１項に記載の方法。 Irradiating the molten laser beam in irradiating the softened laser beam, irradiates the laser from said heterologous member side, The method according to any one of claims 1-4.
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