KR102280691B1 - Heating element for induction heating welding of thermoplastic composite and its manufacturing method - Google Patents
Heating element for induction heating welding of thermoplastic composite and its manufacturing method Download PDFInfo
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- KR102280691B1 KR102280691B1 KR1020190178804A KR20190178804A KR102280691B1 KR 102280691 B1 KR102280691 B1 KR 102280691B1 KR 1020190178804 A KR1020190178804 A KR 1020190178804A KR 20190178804 A KR20190178804 A KR 20190178804A KR 102280691 B1 KR102280691 B1 KR 102280691B1
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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
- 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
- B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
- B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
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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
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
- B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
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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
- B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
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- 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
- B29L2031/779—Heating equipment
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Abstract
본 발명은, 분말상태의 마그네타이트와 열가소성 수지가 혼합된 혼합물을 준비하는 단계, 혼합물을 가열하면서 열가소성 수지가 용융상태로 마그네타이트와 결합되게 하는 단계, 용융상태로 결합된 혼합물을 일정한 두께의 박판 형태로 형성되게 프레스기로 압착한 후, 냉각시키는 단계를 포함하는 열가소성 복합재의 유도가열 용접용 발열체 제조방법을 제공한다.The present invention comprises the steps of preparing a mixture in which powdered magnetite and a thermoplastic resin are mixed, heating the mixture so that the thermoplastic resin is combined with the magnetite in a molten state, and converting the combined mixture in a molten state into a thin plate form of a certain thickness It provides a method for manufacturing a heating element for induction heating welding of a thermoplastic composite material, comprising the step of cooling after pressing with a press machine to be formed.
Description
본 발명은 열가소성 복합재를 유도가열로 용접 결합이 이루어지게 하는 열가소성 복합재의 유도가열 용접용 발열체 및 그 제조방법에 관한 것이다.The present invention relates to a heating element for induction heating welding of a thermoplastic composite material for welding the thermoplastic composite material by induction heating, and a method for manufacturing the same.
일반적으로, 열가소성 복합재는 자동차, 항공, 전자, 건설, 스포츠 레저 및 국방 산업, 의료 산업등과 관련하여 산업재료로서 사용한다. 이러한, 열가소성 복합재는 용접, 용융 융해, 접착제 결합 및 기계적인 체결 등 여러 가지 형태로 함께 접합될 수 있다.In general, thermoplastic composites are used as industrial materials in relation to automobiles, aviation, electronics, construction, sports leisure and defense industries, medical industries, and the like. Such a thermoplastic composite material may be joined together in various forms, such as welding, melt melting, adhesive bonding, and mechanical fastening.
그러나, 열가소성 복합재의 기계적인 체결은 그들의 첨가량은 물론 재료와 설치 비용 등의 이유로 일부 응용예에는 바람직하지 않을 수 있다. 더불어, 접착제 결합은 플라즈마 에칭 또는 노동 집약적인 사포질과 같은 시간을 들여서 개량된 공정을 사용해서 결합 표면의 넓은 표면 준비가 필요한 번거로움이 있다. 용접 기술은 결합부에서 비교적 고온, 일반적으로 700℉에서 수행해야 하는데 이것은 예비 압밀화 부품의 재용해의 원인이 될 수 있다. 부품의 재용해는 형상 측면 및/또는 부품의 재료 특성 측면에서 불량한 변화를 가져오는 문제점이 있다.However, mechanical fastening of thermoplastic composites may be undesirable for some applications for reasons such as their amount added, as well as material and installation costs. In addition, adhesive bonding is cumbersome, requiring large surface preparation of the bonding surface using time-consuming and advanced processes such as plasma etching or labor-intensive sanding. Welding techniques must be performed at relatively high temperatures at the joint, typically 700°F, which can cause remelting of the pre-consolidated parts. The remelting of the part has a problem of causing poor changes in terms of shape and/or material properties of the part.
한편, 유도가열 용접은 전도성을 가지는 물체를 코일 내 자장 속으로 들어가게 함으로 전도성을 가지는 물체에 맴돌이 전류를 유도하여 열을 발생하게 하는데, 이러한, 유도가열 용접은 접합부에 대한 국부가열 및 복잡한 형상에도 적용 가능하여 열가소성 복합재의 용접에 사용할 경우 재용해를 방지하면서 측면 및/또는 부품의 재료 특성 측면에서 불량한 변화를 방지할 수 있는 바, 열가소성 복합재의 용접에 적용 가능할 경우 안정적인 용접을 가능하게 할 것으로 기재된다.On the other hand, induction heating welding generates heat by inducing eddy currents in conductive objects by putting a conductive object into a magnetic field in a coil. It is possible that when used for welding of thermoplastic composites, it is possible to prevent remelting while preventing poor changes in the material properties of the side and/or parts, and when applicable to welding of thermoplastic composites, stable welding is possible. .
그러나, 전도성을 가지지 않는 열가소성 복합재는, 유도 가열이 이루어지지 않음으로 인해 열가소성 복합재의 유도 가열을 통한 용접을 수행하고자 할 경우, 재용해를 방지할 수 있는 온도 상에서 용접이 이루어짐과 더불어 측면 및/또는 부품의 재료 특성 측면에서 불량한 변화를 방지할 수 있는 유도가열 용접용 발열체를 필요로 하는 실정이다.However, since the non-conductive thermoplastic composite material is not subjected to induction heating, when welding through induction heating of the thermoplastic composite material is to be performed, welding is performed at a temperature that can prevent re-melting, and the side and / or There is a need for a heating element for induction heating welding that can prevent poor changes in the material properties of parts.
이같은, 종래의 열가소성 복합재료의 접합방법에 대한 기술은, 대한민국공개특허 제10-2015-0091309호(2015.08.10)에 제시된다.Such a technique for a conventional bonding method of a thermoplastic composite material is presented in Korean Patent Application Laid-Open No. 10-2015-0091309 (2015.08.10).
본 발명은, 열가소성 복합재를 유도 가열로 접합시, 열가소성 복합재의 재료특성 측면에서의 불량한 변화없이 안정적인 접합이 이루어질 수 있게 하는 열가소성 복합재의 유도가열 용접용 발열체 및 그 제조방법을 제공하는데 목적이 있다.An object of the present invention is to provide a heating element for induction heating welding of a thermoplastic composite material and a method for manufacturing the same, which enables stable bonding without poor change in material properties of the thermoplastic composite material when bonding the thermoplastic composite material by induction heating.
본 발명은, 분말상태의 마그네타이트와 열가소성 수지가 혼합된 혼합물을 준비하는 단계, 상기 혼합물을 가열하면서 열가소성 수지가 용융상태로 마그네타이트와 결합되게 하는 단계, 용융상태로 결합된 상기 혼합물을 일정한 두께의 박판 형태로 형성되게 프레스기로 압착한 후, 냉각시키는 단계를 포함하는 열가소성 복합재의 유도가열 용접용 발열체 제조방법을 제공한다.The present invention comprises the steps of preparing a mixture of powdered magnetite and a thermoplastic resin, heating the mixture so that the thermoplastic resin is combined with the magnetite in a molten state, and applying the mixture combined in a molten state to a thin plate of a certain thickness It provides a method for manufacturing a heating element for induction heating welding of a thermoplastic composite material, comprising the step of cooling after pressing with a press machine to form a shape.
또한, 상기 열가소성 수지는, 폴리아미드이며, 상기 혼합물은 마그네타이트 50 ~ 80중량%, 열가소성 수지 20 ~ 50중량%의 혼합 비율로 혼합할 수 있다.In addition, the thermoplastic resin is polyamide, and the mixture may be mixed at a mixing ratio of 50 to 80% by weight of magnetite and 20 to 50% by weight of the thermoplastic resin.
또한, 상기 혼합물을 가열하면서 열가소성 수지가 용융상태로 마그네타이트와 결합되게 하는 단계는, 상기 혼합물을 50 ~ 370℃ 온도로 10분간 가열할 수 있다.In addition, in the step of allowing the thermoplastic resin to be combined with the magnetite in a molten state while heating the mixture, the mixture may be heated at a temperature of 50 to 370° C. for 10 minutes.
또한, 상기 용융상태로 결합된 혼합물을 일정한 두께의 박판 형태로 형성되게 프레스기로 압착한 후, 냉각시키는 단계는, 상기 용융상태로 결합된 혼합물을 3 ~ 5MPa의 압력으로 압착하면서 440 ~ 460㎛를 두께로 형성시키는 단계와, 압착된 상기 혼합물을 70℃ 이하의 온도로 냉각시키는 단계를 포함할 수 있다.In addition, the step of cooling after pressing the mixture combined in the molten state with a press to form a thin plate shape of a certain thickness, 440 ~ 460㎛ while pressing the mixture combined in the molten state at a pressure of 3 ~ 5 MPa It may include forming a thickness and cooling the compressed mixture to a temperature of 70° C. or less.
본 발명에 따른 열가소성 복합재의 유도가열 용접용 발열체는, 마그네타이트와 열가소성 수지가 혼합된 혼합물을 용융상태로 결합한 후, 일정한 두께의 박판 형태로 압착하고 냉각하여 제조한 바, 열가소성 복합재의 접합부위에 혼합물을 위치시킨 상태에서 유도가열이 이루어지게 하면, 혼합물 내 마그네타이트가 가열되면서 열가소성 수지 및 열가소성 복합재의 접합부위를 용융되게 하여 열가소성 복합재의 재료 자체의 특성변화없이 안정적인 접합이 이루어지게 한다.The heating element for induction heating welding of a thermoplastic composite material according to the present invention is manufactured by combining a mixture of magnetite and a thermoplastic resin in a molten state, then compressing it into a thin plate form of a certain thickness and cooling it. When the induction heating is performed in the positioned state, the magnetite in the mixture is heated and the joint portion of the thermoplastic resin and the thermoplastic composite is melted, thereby achieving stable bonding without changing the properties of the material itself of the thermoplastic composite.
도 1은 본 발명의 일 실시예에 따른 열가소성 복합재의 유도가열 용접용 발열체 제조방법을 나타낸 순서도이다.1 is a flowchart illustrating a method for manufacturing a heating element for induction heating welding of a thermoplastic composite material according to an embodiment of the present invention.
이하 첨부된 도면을 참조로 본 발명의 바람직한 실시예들을 상세히 설명하기로 한다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
도 1은 본 발명의 일 실시예에 따른 열가소성 복합재의 유도가열 용접용 발열체 제조방법을 나타낸 순서도이다. 도 1을 참조하여, 일 실시예에 따른 열가소성 복합재의 유도가열 용접용 발열체 제조방법을 설명하면, 먼저, 혼합물을 준비한다(S100). 여기서, 혼합물은 분말상태의 마그네타이트(Magnetite)와 열가소성 수지를 혼합하여 조성한다(S100). 이때, 마그네타이트는 나노 크기의 입자를 가지는 분말상태로 형성된다. 이러한, 마그네타이트의 입자 크기는 200 ~ 300㎛를 선택 사용할 수 있으나, 이에 한정하지 않고 더 작은 입자 크기를 가질 수도 있다. 여기서, 마그네타이트의 입자크기가 작아질 수록 열가소성 수지 경화시 물리적 특성을 좋아지게 할 수 있다. 그리고, 열가소성 수지는 폴리아미드(Polyamide)를 사용하나, 이에 한정하지 않고 열가소성 복합재의 성분에 따라 변경 적용가능함은 물론이다. 여기서, 마그네타이트는 유도가열 용접기의 코일 내 자장 속에서 열이 발생되게 하면서 혼합물 내 열가소성 수지 및 열가소성 복합재의 접합부위를 일부 녹여 접합이 이루어지게 하고, 열가소성 수지는 마그네타이트를 열가소성 복합재의 접합부위에 안정적으로 분포상태로 배치되게 함과 더불어 마그네이타이트에서 발생하는 열에 의해 용융되면서 열가소성 복합재의 접합부위에 대한 접합을 증대되게 한다.1 is a flowchart illustrating a method for manufacturing a heating element for induction heating welding of a thermoplastic composite material according to an embodiment of the present invention. Referring to FIG. 1 , a method for manufacturing a heating element for induction heating welding of a thermoplastic composite material according to an embodiment will be described. First, a mixture is prepared (S100). Here, the mixture is prepared by mixing powdered magnetite and a thermoplastic resin (S100). At this time, the magnetite is formed in a powder state having nano-sized particles. As for the particle size of the magnetite, 200 to 300 μm may be selectively used, but the present invention is not limited thereto and may have a smaller particle size. Here, the smaller the particle size of the magnetite, the better the physical properties when curing the thermoplastic resin. And, the thermoplastic resin uses polyamide (Polyamide), but it is not limited thereto, and it is of course possible to change and apply it according to the components of the thermoplastic composite material. Here, the magnetite causes heat to be generated in the magnetic field in the coil of the induction heating welding machine and melts some of the joint parts of the thermoplastic resin and the thermoplastic composite in the mixture to make the joint, and the thermoplastic resin stably distributes the magnetite to the joint of the thermoplastic composite. In addition to being placed in the state, it is melted by the heat generated from the magnetite, thereby increasing the bonding of the thermoplastic composite to the bonding area.
이때, 상기 혼합물은 분말상태의 마그네타이트 50 ~ 80중량%, 열가소성 수지 20 ~ 50중량%의 혼합 비율로 혼합 형성한다. 여기서, 마그네타이트가 50중량%보다 적게 투입하게 되면 유도가열 용접기의 코일 내 자장 속에서 가열이 안정적으로 이루어지지 못하면서 열가소성 복합재의 접합부위에 대한 용접이 안정적으로 이루어지지 못하게 된다. 반면에, 마그네타이트가 80중량%를 초과하여 투입하게 되면 열가소성 복합재의 접합부위에 대해 열가소성 수지를 통한 접합력이 약해지게 되는 문제점이 있다.At this time, the mixture is formed by mixing 50 to 80% by weight of the powdered magnetite and 20 to 50% by weight of the thermoplastic resin. Here, when the amount of magnetite is less than 50% by weight, heating is not stably performed in the magnetic field in the coil of the induction heating welding machine, and welding to the joint portion of the thermoplastic composite is not performed stably. On the other hand, when the amount of magnetite exceeds 80% by weight, there is a problem in that the bonding force through the thermoplastic resin to the bonding portion of the thermoplastic composite material is weakened.
이후, 상기 혼합물을 가열한다(S110). 즉, 혼합물을 가열하면서 혼합물 중 열가소성 수지가 용융상태로 마그네타이트와 결합이 이루어지게 한다. 이같이, 혼합물이 용융상태로 혼합 결합되면서 이후 프레스기로 압착시 열가소성 수지와 마그네타이트가 일체상태의 박판 형태로 형성될 수 있다. 여기서, 혼합물은 50 ~ 370℃의 온도로 10분간 가열하면서 열가소성 수지가 안정적인 용융상태로 마그네타이트와 혼합상태로 결합이 이루어지게 한다.Then, the mixture is heated (S110). That is, while heating the mixture, the thermoplastic resin in the mixture is in a molten state and bonded to the magnetite. As such, while the mixture is mixed and bonded in a molten state, the thermoplastic resin and magnetite may be formed in the form of an integral thin plate when compressed with a press. Here, the mixture is heated at a temperature of 50 to 370° C. for 10 minutes so that the thermoplastic resin is combined with magnetite in a stable molten state in a mixed state.
이렇게, 상기 열가소성 수지가 용융되면서 마그네타이트와 결합된 상태의 상기 혼합물은 일정한 박판 두께로 압착한 후 냉각한다(S120). 이같이, 혼합물이 일정한 박판 두께로 형성되게 함으로써, 용접대상인 열가소성 복합재의 접합부위 사이에 혼합물을 배치함과 더불어 유도가열시 빠른 시간 내 가열이 이루어지면서 열가소성 복합재의 접합부위에 대한 안정적인 접합이 이루어지게 한다.In this way, while the thermoplastic resin is melted, the mixture in a state combined with magnetite is compressed to a predetermined thin plate thickness and then cooled (S120). In this way, by allowing the mixture to be formed with a constant thin plate thickness, the mixture is disposed between the joint portions of the thermoplastic composite material to be welded, and heating is performed within a short time during induction heating to ensure stable bonding to the joint portion of the thermoplastic composite material.
이러한, 공정에 대해 좀 더 상세하게 설명하면, 먼저, 용융상태로 결합된 혼합물이 프레스기를 통해 3MPa의 압력으로 압착되면서 440 ~ 460㎛ 두께로 형성되게 한다. 이때, 혼합물의 두께가 440㎛보다 얇게 형성될 경우 발열이 안정적으로 이루어지지 않음과 더불어 열가소성 수지를 통한 접합력이 낮아지면서 용접대상인 열가소성 복합재의 접합부위에 대한 접합이 안정적으로 이루어지지 않게 된다.When describing this process in more detail, first, the mixture combined in a molten state is compressed at a pressure of 3 MPa through a press to be formed to a thickness of 440 ~ 460 μm. At this time, when the thickness of the mixture is formed to be thinner than 440 μm, the heat is not stably generated and the bonding force through the thermoplastic resin is lowered, so that the bonding to the bonding portion of the thermoplastic composite material to be welded is not made stably.
이렇게, 프레스기에 의해 일정한 박판 두께로 압착된 혼합물은 냉각하게 된다. 이때, 박판 두께로 압착된 혼합물은 프레스기에서 쉽게 이탈시킬 수 있도록 70℃ 이하의 온도가 될 때까지 냉각되게 한다. 이렇게, 혼합물은 추가적인 냉각을 통해 박판 두께의 고체 상태로 완성되어, 이후 열가소성 복합재의 접합부위에 대한 접합시, 열가소성 복합재의 접합부위에 안정적인 삽입 배치를 가능하게 한다.In this way, the mixture compressed to a certain thin plate thickness by the press is cooled. At this time, the mixture compressed to a thin plate thickness is allowed to cool until it reaches a temperature of 70° C. or less so that it can be easily removed from the press. In this way, the mixture is completed in a solid state with a thin plate thickness through additional cooling, thereby enabling a stable insertion arrangement at the joint portion of the thermoplastic composite material when bonding to the joint portion of the thermoplastic composite material.
이같은, 제조방법을 통해 제조된 열가소성 복합재의 유도가열 용접용 발열체는, 마그네타이트와 열가소성 수지가 혼합된 혼합물을 용융상태로 결합한 후, 일정한 두께의 박판 형태로 압착하고 냉각하여 제조한 바, 열가소성 복합재의 접합부위에 혼합물을 위치시킨 상태에서 유도가열이 이루어지게 하면, 혼합물 내 마그네타이트가 가열되면서 열가소성 수지 및 열가소성 복합재의 접합부위를 용융되게 하여 열가소성 복합재의 재료 자체의 특성변화없이 안정적인 접합이 이루어지게 한다.The heating element for induction heating welding of a thermoplastic composite manufactured through this manufacturing method is manufactured by combining a mixture of magnetite and a thermoplastic resin in a molten state, then compressing and cooling it in the form of a thin plate of a certain thickness. When induction heating is performed while the mixture is placed at the bonding site, the magnetite in the mixture is heated to melt the bonding area of the thermoplastic resin and the thermoplastic composite material, thereby achieving stable bonding without changing the properties of the material itself of the thermoplastic composite material.
본 발명은 도면에 도시된 실시예를 참고로 설명되었으나 이는 예시적인 것에 불과하며, 본 기술 분야의 통상의 지식을 가진 자라면 이로부터 다양한 변형 및 균등한 다른 실시예가 가능하다는 점을 이해할 것이다. 따라서, 본 발명의 진정한 기술적 보호 범위는 첨부된 청구범위의 기술적 사상에 의하여 정해져야 할 것이다.Although the present invention has been described with reference to the embodiments shown in the drawings, which are merely exemplary, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Accordingly, the true technical protection scope of the present invention should be defined by the technical spirit of the appended claims.
Claims (5)
상기 혼합물을 가열하면서 열가소성 수지가 용융상태로 마그네타이트와 결합되게 하는 단계; 및
용융상태로 결합된 상기 혼합물을 일정한 두께의 박판 형태로 형성되게 프레스기로 압착한 후, 냉각시키는 단계;를 포함하며,
상기 혼합물은 200 ~ 300㎛ 입자크기를 가지는 마그네타이트 50 ~ 80중량%, 열가소성 수지인 폴리아미드 20 ~ 50중량%의 혼합 비율로 혼합하고,
상기 용융상태로 결합된 혼합물을 일정한 두께의 박판 형태로 형성되게 프레스기로 압착한 후, 냉각시키는 단계는, 상기 용융상태로 결합된 혼합물을 3 ~ 5MPa의 압력으로 압착하면서 440 ~ 460㎛를 두께로 형성시키는 단계와, 압착된 상기 혼합물을 70℃ 이하의 온도로 냉각시키는 단계를 포함하는 열가소성 복합재의 유도가열 용접용 발열체 제조방법.Preparing a mixture in which the powdered magnetite and the thermoplastic resin are mixed;
allowing the thermoplastic resin to be combined with magnetite in a molten state while heating the mixture; and
After pressing the mixture in a molten state to be formed in the form of a thin plate of a certain thickness with a press, cooling step;
The mixture is mixed in a mixing ratio of 50 to 80% by weight of magnetite having a particle size of 200 to 300㎛, and 20 to 50% by weight of polyamide, which is a thermoplastic resin,
After pressing the mixture combined in the molten state with a press machine to form a thin plate shape of a certain thickness, the step of cooling is, while pressing the mixture combined in the molten state at a pressure of 3 to 5 MPa to a thickness of 440 ~ 460㎛ A method for manufacturing a heating element for induction heating welding of a thermoplastic composite comprising the step of forming and cooling the compressed mixture to a temperature of 70° C. or less.
상기 혼합물을 가열하면서 열가소성 수지가 용융상태로 마그네타이트와 결합되게 하는 단계는,
상기 혼합물을 50 ~ 370℃ 온도로 10분간 가열하는 열가소성 복합재의 유도가열 용접용 발열체 제조방법.The method according to claim 1,
The step of allowing the thermoplastic resin to be combined with magnetite in a molten state while heating the mixture,
A method for producing a heating element for induction heating welding of a thermoplastic composite in which the mixture is heated at a temperature of 50 to 370° C. for 10 minutes.
A heating element for induction heating welding of a thermoplastic composite material manufactured by the manufacturing method of claim 1 or 3.
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