US20100237610A1 - Method for joining pipes and junction structure for joining pipes - Google Patents

Method for joining pipes and junction structure for joining pipes Download PDF

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Publication number
US20100237610A1
US20100237610A1 US12/721,938 US72193810A US2010237610A1 US 20100237610 A1 US20100237610 A1 US 20100237610A1 US 72193810 A US72193810 A US 72193810A US 2010237610 A1 US2010237610 A1 US 2010237610A1
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US
United States
Prior art keywords
pipe
circumferential surface
engaged
inner circumferential
surface side
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US12/721,938
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English (en)
Inventor
Naoki SUIGETSU
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Olympus Corp
Original Assignee
Olympus Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Olympus Corp filed Critical Olympus Corp
Assigned to OLYMPUS CORPORATION reassignment OLYMPUS CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SUIGETSU, NAOKI
Publication of US20100237610A1 publication Critical patent/US20100237610A1/en
Priority to US13/476,502 priority Critical patent/US8632646B2/en
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
    • F16L13/14—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling
    • 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
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • 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
    • B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
    • 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
    • B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
    • B29C65/60—Riveting or staking
    • B29C65/606—Riveting or staking the rivets being integral with one of the parts to be joined, i.e. staking
    • 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
    • B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
    • B29C65/64—Joining a non-plastics element to a plastics element, e.g. by force
    • B29C65/645—Joining a non-plastics element to a plastics element, e.g. by force using friction or ultrasonic vibrations
    • 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
    • B29C66/01—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
    • B29C66/303—Particular design of joint configurations the joint involving an anchoring effect
    • B29C66/3032—Particular design of joint configurations the joint involving an anchoring effect making use of protrusions or cavities belonging to at least one of the parts to be joined
    • B29C66/30325—Particular design of joint configurations the joint involving an anchoring effect making use of protrusions or cavities belonging to at least one of the parts to be joined making use of cavities belonging to 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
    • 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
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
    • 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
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • 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
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/524—Joining profiled elements
    • B29C66/5241—Joining profiled elements for forming coaxial connections, i.e. the profiled elements to be joined forming a zero angle relative to each other
    • 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
    • B29C66/63—Internally supporting the article during joining
    • 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
    • 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
    • B29C66/73116—Melting point of different melting point, i.e. the melting point of one of the parts to be joined being different from the melting point 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
    • B29C66/731—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
    • B29C66/7315—Mechanical properties
    • B29C66/73151—Hardness
    • 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
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    • 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
    • B29C66/70—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
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • 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
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
    • F16L47/20—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics based principally on specific properties of plastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • 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
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2055/00—Use of specific polymers obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in a single one of main groups B29K2023/00 - B29K2049/00, e.g. having a vinyl group, as moulding material
    • B29K2055/02—ABS polymers, i.e. acrylonitrile-butadiene-styrene polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/12—Thermoplastic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2305/00—Use of metals, their alloys or their compounds, as reinforcement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2309/00—Use of inorganic materials not provided for in groups B29K2303/00 - B29K2307/00, as reinforcement
    • B29K2309/02—Ceramics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/007—Hardness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/737—Articles provided with holes, e.g. grids, sieves

Definitions

  • the present invention relates to a pipe joining method for joining pipes together, and to a junction structure for joining pipes.
  • the present invention relates to a method for joining pipes and a junction structure for joining pipes when one of the pipes is formed from a thermoplastic resin.
  • the present invention employs the following means.
  • the present invention is a method for joining pipes in which a first pipe in which at least one portion to be engaged that is sunk inward to an inner circumferential surface side is provided in an outer circumferential surface of an end portion of the first pipe, and a second pipe that is made of thermoplastic resin are joined together.
  • the present invention is provide with a first step in which an end portion of the first pipe is inserted into an end portion of the second pipe, and a second step in which, as a result of a transmitting component that transmits ultrasonic waves being pressed against a position on an outer circumferential surface side of the second pipe that corresponds to the portion to be engaged of the inserted first pipe, the second pipe is softened by the ultrasonic waves so that an engaging portion is formed which is made to protrude into the portion to be engaged, which is positioned on the inner circumferential surface side of the first pipe, and becomes engaged with this portion to be engaged.
  • a transmitting component that transmits ultrasonic waves is pressed against a position on an outer circumferential surface side of the second pipe that corresponds to the portion to be engaged that is formed on an end portion of the inserted first pipe.
  • Ultrasonic waves emitted from this transmitting component are transmitted to a main body portion of the second pipe via the outer circumferential surface thereof.
  • frictional heat is generated in the second pipe.
  • the second pipe which is made of a thermoplastic resin is heated and softened by this frictional heat.
  • the portion thereof which is pressed by the transmitting component forms an engaging portion which protrudes inside the portion to be engaged of the first pipe which is positioned on the inner circumferential surface side of the second pipe. After cooling and hardening, the engaging portion forms a state of engagement with the engaged portion. Because of this, the first pipe and the second pipe can be securely joined together by the engaged portion and the engaging portion.
  • a state i.e., a superior state
  • the second pipe prefferably be provided with at least one protruding portion on an outer circumferential surface of an end portion thereof that corresponds to the portion to be engaged of the first pipe, and, in the second step, for the engaging portion to be formed by this protruding portion being pressed by the transmitting component.
  • a transmitting component is pressed against a protruding portion formed on an outer circumferential surface of the second pipe, and transmits ultrasonic waves.
  • the second pipe is heated and softened by the frictional heat generated by the ultrasonic waves and is also pressed.
  • an engaging portion that protrudes on the inner circumferential surface side of the second pipe is formed.
  • the protruding portion on the outer circumferential surface side of the second pipe sinks inside the outer circumferential surface of the second pipe as the engaging portion which protrudes on the inner circumferential surface side is gradually being formed.
  • the transmitting component If the transmitting component is pressed until it contacts the outer circumferential surface surrounding the protruding portion of the second pipe, it is possible to keep the outer circumferential surface of the second pipe in a state with few surface irregularities (i.e., in a superior state) while maintaining a state in which the first pipe and the second pipe are securely joined together.
  • the portion to be engaged of the first pipe prefferably be a through hole that penetrates from the outer circumferential surface to the inner circumferential surface of the first pipe. Furthermore, in the second step, after a molding jig has been positioned inside the first pipe within a range where at least the through hole is formed and while being positioned apart from the inner circumferential surface of the first pipe, it is preferable for the transmitting component to be pressed against the second pipe so that a portion of the second pipe is made to protrude onto the inner circumferential surface side of the first pipe as an engaging portion until the second pipe is deformed by the molding jig.
  • the second step ultrasonic waves are transmitted from the transmitting component while a molding jig is positioned inside the first pipe.
  • the engaging portion which protrudes onto the inner circumferential surface side of the second pipe protrudes from the portion to be engaged, which forms a through hole, onto the inner circumferential surface side of the first pipe, and contacts the molding jig.
  • the pressing is performed while the ultrasonic waves are being transmitted by the transmitting component, the engaging portion is prevented by the molding jig from protruding any further onto the inner circumferential surface side of the first pipe.
  • the engaging portion is deformed in a sideways direction on the molding jig, and the width of the engaging portion being engaged expands to become wider than the width of the portion being engaged. Because of this, the distal end of the engaging portion of the second pipe becomes engaged with the portion being engaged, and the engagement strength can be improved even further.
  • the present invention is a junction structure for joining pipes together in which an end portion of a first pipe is inserted into an end portion of a second pipe that is made from a thermoplastic resin.
  • the present invention is provided with at least one portion to be engaged that is provided on an outer circumferential surface of an end portion of the first pipe so as to be sunk inward to the inner circumferential surface side, and with an engaging portion that is provided so as to protrude from the inner circumferential surface of the end portion of the second pipe, and the portion to be engaged and the engaging portion are engaged together.
  • junction structure for joining pipes of this invention as a result of the engaging portion of the second pipe being engaged with the portion to be engaged which is formed on the outer circumferential surface of the first pipe within the range where the end portion of the first pipe is inserted inside the second pipe, it is possible for the two pipes to be securely joined together. Note that, in this junction structure for joining pipes, because an engaging portion that protrudes onto the inner circumferential surface side of the second pipe is formed by deforming the second pipe and made to become engaged with the portion to be engaged of the first pipe, the two pipes can be easily joined together.
  • the engaging portion prefferably be formed as a result of the second pipe being softened and deformed by ultrasonic waves.
  • the junction structure for joining pipes of this invention by heating and softening the second pipe using ultrasonic waves and thereby deforming it, the task of joining the two pipes together is made easy. Furthermore, the outer circumferential surface of the second pipe can be formed in a state of few surface irregularities (i.e., in an even more superior state).
  • the engaging portion prefferably be a portion which is made to protrude onto the inner circumferential surface side as a result of ultrasonic waves being transmitted to the protruding portion which is protruding on the outer circumferential surface side of the second pipe.
  • the protruding portion which protrudes on the outer circumferential surface side is softened.
  • the outer circumferential surface of the second pipe can be formed in a state of few surface irregularities (i.e., in an even more superior state).
  • the portion to be engaged it is preferable for the portion to be engaged to be a through hole that penetrates from the outer circumferential surface side to the inner circumferential surface side of the first pipe. Furthermore, it is also preferable for a distal end of the engaging portion to protrude onto the inner circumferential surface side of the first pipe, and for the width of the distal end to be wider than the width of the through hole.
  • the distal end of the engaging portion of the second pipe that is engaged with the portion to be engaged of the first pipe is formed so that the width thereof expands. Namely, the distal end can be engaged in the portion to be engaged, which is a through hole, so that the join strength is improved even further.
  • FIG. 1 is a perspective view showing a junction structure for joining pipes of a first embodiment of the present invention.
  • FIG. 2 is a cross-sectional view as seen from a side showing the junction structure for joining pipes of the first embodiment of the present invention.
  • FIG. 3 is a cross-sectional view as seen from the front showing the junction structure for joining pipes of the first embodiment of the present invention.
  • FIG. 4 is an explanatory view showing a preliminary step of a method for joining pipes of the first embodiment of the present invention.
  • FIG. 5A is an explanatory view showing a first step of the method for joining pipes of the first embodiment of the present invention.
  • FIG. 5B is an explanatory view showing the first step of the method for joining pipes of the first embodiment of the present invention.
  • FIG. 6 is an explanatory view showing a second step of the method for joining pipes of the first embodiment of the present invention.
  • FIG. 7 is an explanatory view showing the second step of the method for joining pipes of the first embodiment of the present invention.
  • FIG. 8 is an explanatory view showing the second step of the method for joining pipes of the first embodiment of the present invention.
  • FIG. 9 is a perspective view showing the junction structure for joining pipes of a first variant example of the first embodiment of the present invention.
  • FIG. 10 is a perspective view showing a pre-join state in the junction structure for joining pipes of the first variant example of the first embodiment of the present invention.
  • FIG. 11 is a perspective view showing a junction structure for joining pipes of a second variant example of the first embodiment of the present invention.
  • FIG. 12 is a perspective view showing a pre join state in the junction structure for joining pipes of the second variant example of the first embodiment of the present invention.
  • FIG. 13 is a cross-sectional view as seen from a side showing the junction structure for joining pipes of the second embodiment of the present invention.
  • FIG. 14 is a cross-sectional view as seen from the front showing the junction structure for joining pipes of the second embodiment of the present invention.
  • FIG. 15 is an enlarged cross-sectional view showing details of a junction portion in the junction structure for joining pipes of the second embodiment of the present invention.
  • FIG. 16 is an explanatory view showing a second step of the method for joining pipes of the second embodiment of the present invention.
  • FIG. 17 is an explanatory view showing the second step of the method for joining pipes of the second embodiment of the present invention.
  • FIG. 18 is a perspective view showing an example of a molding jig that is used in the second step of the method for joining pipes of the second embodiment of the present invention.
  • FIG. 19 is a perspective view showing another example of a molding jig that is used in the second step of the method for joining pipes of the second embodiment of the present invention.
  • FIG. 20 is an explanatory view showing the second step when the molding jig of the other example is used in the method for joining pipes of the second embodiment of the present invention.
  • FIG. 21 is an explanatory view showing the second step when the molding jig of the other example is used in the method for joining pipes of the second embodiment of the present invention.
  • FIG. 1 through FIG. 3 show a first pipe and a second pipe that have been joined together using the junction structure of the present invention.
  • a junction structure 10 of the present embodiment joins together a first pipe 1 and a second pipe 2 .
  • the first pipe 1 has a substantially circular cross-section, and through holes 1 b which form portions to be engaged are provided in an end portion 1 a that is inserted into the second pipe 2 .
  • through holes 1 b are provided at positions facing each other in the radial direction of the first pipe 1 .
  • each through hole 1 b is formed in a substantially rectangular shape.
  • the second pipe 2 has a substantially circular cross-section, and is provided with engaging portions 2 b that protrude from an inner circumferential surface of an end portion 2 a into which the first pipe 1 is inserted. These engaging portions 2 b are provided at positions where they engage with the through holes 1 b of the first pipe 1 . Namely, two engaging portions 2 b are provided at positions facing each other.
  • the engaging portions 2 b respectively engage with the through hole 1 b in the corresponding position.
  • the through holes 1 b of the first pipe 1 and the engaging portions 2 b of the second pipe 2 constitute a junction structure 10 by being mutually engaged.
  • the second pipe 2 is made of a thermoplastic resin such as ABS (acrylonitrile-butadiene-styrene copolymer) or polyethylene or the like.
  • the first pipe 1 can be selectively made of various materials such as metal, resin, ceramics or the like.
  • the material used for the first pipe 1 it is desirable for the material used for the first pipe 1 to be provided with a higher melting point and a greater hardness than the thermoplastic resin used to form the second pipe 2 .
  • the gap between the outer circumferential surface of the first pipe 1 and the inner circumferential surface of the second pipe 2 is as small as possible when the first pipe 1 and the second pipe 2 are engaged.
  • both the first pipe 1 and the second pipe 2 are pipes having a diameter of approximately 10 mm
  • the outer diameter of the first pipe 1 to be made slightly larger than the inner diameter of the second pipe 2 , and to press-insert the first pipe 1 inside the second pipe 2 such that at least one of the first pipe 1 or the second pipe 2 is elastically deformed.
  • a pre-join first pipe 1 A and second pipe 2 A are prepared.
  • Through holes 1 b are formed in the first pipe 1 A in an end portion 1 a thereof which is inserted into the second pipe 2 A.
  • Protruding portions 2 e that protrude from an outer circumferential surface 2 d are formed on the second pipe 2 A at positions that correspond to the through holes 1 b of the inserted first pipe 1 A.
  • the shape of these protruding portions 2 e is formed so as to correspond to the through holes 1 b in the first pipe 1 A.
  • the protruding portions 2 e are formed in a rectangular shape having substantially the same transverse dimensions as the through holes 1 b .
  • the protrusion amount is set so as to be substantially the same as the protrusion amount of the engaging portions 2 b (described below).
  • the second pipe 2 A does not have any portion that protrudes from the inner circumferential surface 2 c thereof.
  • the first pipe 1 A and the second pipe 2 A are fixed in positions where they are able to be joined together. Namely, as shown in FIG. 5 , the first pipe 1 A and the second pipe 2 A are each fixed in a fixing jig (not shown), and the end portion 1 a of the first pipe 1 A is inserted inside the second pipe 2 A. At this time, because no protruding portion has been provided on the inner circumferential surface of the second pipe 2 A, the first pipe 1 A can be easily inserted into the second pipe 2 A.
  • the positions in the axial directions and circumferential directions of the first pipe 1 A and second pipe 2 A are adjusted such that the positions of the through holes 1 b and the protruding portions 2 e substantially match each other in the axial direction and circumferential direction, and the through holes 1 b and the protruding portions 2 e are set so as to be in the same positions in the radial directions of the first pipe 1 A and the second pipe 2 A.
  • an ultrasonic horn 15 which is a transmitting component is placed against one protruding portion 2 e of the second pipe 2 A, and the protruding portion 2 e is pressed towards the inner circumferential surface side in the radial direction while ultrasonic waves are being generated.
  • an end surface 15 a of the ultrasonic horn 15 that is placed against the protruding portion 2 e preferably has a concave portion having a radius of curvature that is substantially equal to the radius of curvature of the outer circumferential surface 2 d of the second pipe 2 .
  • the ultrasonic waves emitted from the ultrasonic wave horn 15 are transmitted via the protruding portion 2 e to the main body portion of the second pipe 2 A.
  • frictional heat is generated in the second pipe 2 A.
  • the second pipe 2 A is made of a thermoplastic resin, and the first pipe 1 A has the through holes 1 b in positions facing the ultrasonic horn 15 . Because of this, the second pipe 2 A is heated and softened by the frictional heat generated by the transmitted ultrasonic waves.
  • the protruding portion 2 e is deformed into an engaging portion 2 b which protrudes inside the through hole 1 b on the inner circumferential surface side in the radial direction of the second pipe 2 A by the pressing force from the ultrasonic horn 15 . And the engaging portion 2 b is thus engaged with the through hole 1 b in the first pipe 1 A which forms a portion to be engaged.
  • the protruding portion 2 e against which the ultrasonic horn 15 has been placed sinks into the inner circumferential side of the second pipe 2 A by substantially the same volumetric amount as the volume of the engaging portion 2 b which is protruding onto the inner circumferential surface side of the second pipe 2 A.
  • the outer circumferential surface 2 d of the second pipe 2 A and the outer circumferential surface of the protruding portion 2 e are substantially the same.
  • the first pipe 1 A and the second pipe 2 A are inverted, and the protruding portion 2 e on the opposite side as well also forms an engaging portion 2 b by being pressed while receiving transmitted ultrasonic waves in the same way from the ultrasonic horn 15 .
  • the engaging portions 2 b protruding on the inner circumferential side of the second pipe 2 are engaged with all of the through holes 1 b which are the portions to be engaged of the first pipe 1 .
  • the first pipe 1 and the second pipe 2 are set in a securely joined state by means of the junction structure 10 which is provided with the through holes 1 b and the engaging portions 2 b.
  • junction structure 10 and joining method when the first pipe 1 is inserted inside the second pipe 2 , it is only necessary to press the second pipe 2 while ultrasonic waves are being transmitted thereto by the ultrasonic horn 15 . Because of this, it is possible to easily and securely join the two together while maintaining a state (i.e., a superior state) in which surface irregularities created on the outer circumferential surface 2 d of the second pipe 2 are kept to a minimum.
  • the outer circumferential surface 2 d is also deformed.
  • the protruding portions 2 e on the outer circumferential surface 2 d of the second pipe 2 and then pressing the protruding portions 2 e using the ultrasonic horn 15 , it is possible to form engaging portions 2 b on the inner circumferential surface 2 c side that have the same size as the volume of the sunken protruding portions 2 e . Because of this, it is possible to keep the outer circumferential surface 2 d of the second pipe 2 in a superior state with few surface irregularities while securely joining together the first pipe 1 and the second pipe 2 .
  • the pressing by the ultrasonic horn 15 is made to continue till the end surface 15 a contacts the outer circumferential surface 2 d of the second pipe 2 .
  • the end surface 15 a is formed as a concave surface whose radius of curvature is substantially equal to that of the outer circumferential surface 2 .
  • the shape of the end surface 15 a is transferred to the outer circumferential surface of the second pipe 2 so that the outer circumferential surface of the second pipe 2 can be made uniform. Namely, a state in which there are substantially no surface irregularities on the outer circumferential surface of the second pipe 2 can be achieved, and the external appearance of the pipe after the joining can be made even better.
  • FIG. 9 and FIG. 10 show a first variant example of this embodiment.
  • a junction structure 11 that joins together a first pipe 3 and a second pipe 4 of this variant example
  • through holes 3 a which are portions to be engaged of the first pipe 3 present an elliptical shape
  • engaging portions 4 a that protrude onto the inner circumferential surface side of the second pipe 4 are engaged therein.
  • elliptical protruding portions 4 b are formed at positions on the outer circumferential surface of the second pipe 4 A that correspond to the through holes 3 a in the pre-join first pipe 3 A.
  • FIG. 11 and FIG. 12 show a second variant example of this embodiment. As shown in FIG. 11 and FIG. 12 , in a junction structure 12 of this variant example, a first pipe 5 A ( 5 ) and a second pipe 6 A ( 6 ) which both have a substantially rectangular cross-section are joined together.
  • a single through hole 5 a of the first pipe 5 A ( 5 ) is provided in each one of the four surfaces making up the outer circumferential surface of the first pipe 5 A ( 5 ) in an end portion 5 b which is inserted into the second pipe 6 .
  • protruding portions 6 a are provided in each of the four surfaces making up the outer circumferential surface of the pre join second pipe 6 A in positions that correspond to the through holes 5 a in the first pipe 5 A ( 5 ).
  • one engaging portion 6 b is provided in each one of the four surfaces making up the inner circumferential surface at positions that correspond to the protruding portions 6 a , and is engaged respectively in a through hole 5 a .
  • the junction structure 12 is formed, and the two pipes can be securely joined together.
  • a plurality of groups made up of the through holes, which are the portions to be engaged, of the first pipe and the engaging portions of the second pipe are provided.
  • the present invention is not limited to this.
  • only one group is also sufficient provided that it is still possible to secure the required join strength.
  • a junction structure which is formed by as many groups of portions to be engaged and engaging portions as possible.
  • through holes are used to form the portions to be engaged in the first pipe.
  • the present invention is not limited to this. For example, it is sufficient if they are able to form an engagement with the engaging portions that protrude on the inner circumferential surface side of the second pipe. And, any shape which is sunk from the outer circumferential surface towards the inner circumferential surface side such as a recessed portion formed in the outer circumferential surface is sufficient.
  • FIG. 13 through FIG. 18 A second embodiment of the present invention is described with reference made to FIG. 13 through FIG. 18 .
  • component elements that are the same as those used in the above described first embodiment are given the same descriptive symbols and any description thereof is omitted.
  • a junction structure 30 of the present embodiment joins together a first pipe 21 and a second pipe 22 .
  • This junction structure 30 has through holes 21 b (portions to be engaged) that are formed in an end portion 21 a of the first pipe 21 that is inserted into the second pipe 22 , and engaging portions 22 a that protrude from the inner circumferential surface of the second pipe 22 and are engaged in the though holes 21 b .
  • the second pipe 22 is made of a thermoplastic resin.
  • Distal end portions 22 b of the engaging portions 22 a protrude on the inner circumferential surface side beyond the through holes 21 b , and are expanded to a width B 2 that is larger than the width B 1 of the through holes 21 b .
  • the engaging portions 22 a are engaged with the through holes 21 b.
  • the respective dimensions of the through holes 21 b and the engaging portions 22 a can be suitably altered in accordance with the required join strength.
  • a protrusion amount H of the engaging portions 22 a is approximately 0.75 mm
  • a thickness t of the distal end portions 22 b is approximately 0.3 mm
  • a length b of the bulge portion of the distal end portion 22 b is approximately 0.3 mm.
  • a pre-join first pipe 21 A and second pipe 22 A are prepared.
  • a first step as shown in FIG. 16 and FIG. 17 , the end portion 21 a of the first pipe 21 A is inserted into the second pipe 22 A.
  • a second step as shown in FIG. 16 and FIG. 17 , the protruding portions 22 c of the second pipe 22 A are pressed while ultrasonic waves are transmitted thereto by the ultrasonic horn 15 .
  • this molding jig 16 has been inserted in advance into the interior of the first pipe 21 .
  • this molding jig 16 is a substantially circular column-shaped component that corresponds to the first pipe 21 , while an outer diameter thereof is substantially equal to the inner diameter of the first pipe 21 .
  • D-cut processing has been performed in two locations which are mutually opposite each other in the radial direction on the outer circumferential surface of an end portion 16 a of the molding jig 16 so as to form flat surfaces 16 b .
  • this molding jig 16 is fixed inside the first pipe 21 with the axial direction and circumferential direction thereof set in predetermined positions. Specifically, the flat surfaces 16 b of the molding jig 16 and the through holes 21 b of the first pipe 21 are located and fixed in mutually facing positions such that the flat surfaces 16 b and the through holes 21 b are positioned apart from each other.
  • the distal end portions 22 b of the engaging portions 22 a come into contact with the flat surfaces 16 b of the molding jig 16 which is positioned apart from the inner circumferential surface of the first pipe 21 .
  • the junction structure 30 is formed by the distal end portions 22 b of the engaging portions 22 a being deformed in a sideways direction on the flat surfaces 16 b , and by the width B 2 being hereby expanded so as to become wider than the width B 1 of the through holes 21 b.
  • junction structure 30 which is constructed in the above described manner is able to resist pulling which is applied in a radial direction not simply by means of friction force between the through holes 1 b and the engaging portions 22 a , but also by means of the engagement of the distal ends 22 b . Namely, the first pipe 21 and the second pipe 22 can be more securely joined together.
  • the molding jig that is used is not limited to the one described above.
  • FIG. 19 through FIG. 21 show a variant example of the present embodiment.
  • a molding jig 40 that is used in this variant example is a substantially circular column-shaped component having an outer diameter that is substantially equal to the inner diameter of the first pipe 21 A, and has a distal end portion 40 a of which the outer diameter is decreased.
  • this molding jig 40 is inserted into the first pipe 21 A such that the distal end portion 40 a faces the through holes 21 b .
  • the distal end portion 22 b of the engaging portion 22 a being formed is deformed on the outer circumferential surface of the distal end portion 40 a , and expands. Namely, in the same way as in the present embodiment, the engaging portions 22 a are engaged in the through holes 21 b .
  • the overall thickness in the radial direction of the expanded distal end portion 40 a can be made substantially equal. Because of this, the engagement by the distal end portion 22 b of the engaging portion 22 a can be made more secure and stronger.
  • a second pipe it is sufficient for a second pipe to be made to protrude into a portion to be engaged of a first pipe by being heated and softened by ultrasonic waves. Because of this, two pipes can be joined together cheaply and easily. Furthermore, by causing an engaging portion to be engaged in the portion to be engaged, the necessary strength can be secured, and a reliable join state can be achieved. Moreover, according to the junction structure for joining pipes of the present invention, as a result of the engaging portion of a second pipe being engaged in the portion to be engaged of a first pipe, the necessary strength can be secured and the two pipes can be joined firmly together. Furthermore, as a result of the second pipe being made of a thermoplastic resin, the engaging portion can be formed and engaged easily, and a joined state can be reliably and cheaply achieved.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
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US9468834B2 (en) * 2013-12-17 2016-10-18 Lifetime Products, Inc. Swage and flare joints
JP6339395B2 (ja) * 2014-03-27 2018-06-06 株式会社ティラド 樹脂成形品の溶着方法
WO2019123817A1 (ja) * 2017-12-18 2019-06-27 株式会社デンソー 接合構造体
JP2019107881A (ja) * 2017-12-18 2019-07-04 株式会社デンソー 接合構造体

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