이종재료의 하이브리드 접합기술

이찬주(C.J.Lee),김병민(B.M.Kim) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.5

Nowadays, multi-material design is a modem design concept in industry to achieve the purpose of product best, such as light-weight, cash and corrosion resistance. In this concept, a new joining method is required because of different mechanical and thermal properties of joined materials. Hybrid joining is a combination of at least two fundamental joining techniques. In this paper, the various hybrid joining methods and its joining operations are introduced such as weld-bonding, hybrid clinching, and self piercing rivet. Mechanical joining with adhesive bonding is a typical hybrid joining method. This approach is commonly adopted within the automotive and aerospace industries. Compared to solely mechanical joining method, the advantage of hybrid joining with adhesive bonding is increasing joint strength and durability and improving the ability to absorb energy under impact load. Compared to adhesive bonding method, the hybrid joining can achieve the relief of joint under peel loads and high static loads, extension of temperature range for application.

알루미늄 기반 Advanced Multi-Material 기술의 선진 동향

이목영,정성훈 대한용접접합학회 2016 대한용접·접합학회지 Vol.33 No.5

Global warming is hot issue to keep the earth everlastingly. Despite the increase of the world population and the energy demand, the world oil supply and the oil price are hold the steady state. If we are not decrease the world population and the energy consumption, unforeseeable energy crisis will come in the immediate future. AMT acronym of Advanced Materials for Transportation is a non-profitable IEA-affiliated organization to mitigate the oil consumption and the environment contamination for the transportation. In recent, Annex X Multimaterials Joining was added to enhance the car body weight reduction cause the high fuel efficiency and the low emission of exhaust gas. Multi-materials are the advanced materials application technology to optimize the weight, the performance and the cost with the combination of different materials such as Al-alloy, Mg- alloy, AHSS and CFRP. In this study, the trends of AMT strategy and Al-alloy based multi-materials joining technology were review. Also several technologies for Al-alloy dissimilar joining were investigated.

이종소재 하이브리드 접합기술 및 적용사례

김병민(B.M. Kim),이찬주(C. J. Lee),이상곤(S. K. Lee),최태훈(T. H. Choi) 한국정밀공학회 2011 한국정밀공학회 학술발표대회 논문집 Vol.2011 No.6월

Study on Effect of Process Variable on Fastening Quality Using Process Monitoring Data of Flow Drill Screwed 590DP Steel/AA5052 combination

강태영,이한주,Abdul Karim Md,남대근,이병룡,최정묵,박영도 대한용접접합학회 2022 대한용접·접합학회지 Vol.40 No.3

The reduction of the weight of a vehicle body to improve fuel efficiency has been garnering widespread interest in the automobile industry. As the use of lighter materials increases, the joint of the dissimilar materials becomes crucial to guarantee the rigidity of the vehicle body. Amongst the joining methods for various multi-materials, the flow drill screw (FDS) is a fastening method that can mechanically join two or more plates using fasteners at high speed with a one-sided approach. Several studies have been conducted on the FDS joint quality with process parameters. However, a majority of them are focused on similar aluminum combinations and joint quality with various rotation speeds and downforce. The monitoring data analysis for the FDS joint of 590DP Steel/AA5052 combination and its fastening quality with the various process variables has been investigated in this study. The downforce and feed rate affect the process time required for the penetration stage. The maximum temperature reached during the process decreases as the downforce and feed rate increase. In addition, the critical torque value must be satisfied to ensure a defect-free joint. The combination of the downforce, feed rate, and torque affect the size of the gap at the joint interface. A high torque value can reduce the gap in the final tightening step. However, the joint strength of the FDS did not show differences with the gap. All the joints failed the pull-out mode when the fastener was released from the lower aluminum sheet.

용접공정을 이용한 CFRP와 금속의 접합기술 동향

김용(Yong Kim),방희선(Hee-seon Bang) 대한용접·접합학회 2018 대한용접·접합학회지 Vol.36 No.5

Techniques for joining lightweight dissimilar materials, particularly metals and polymers including CFRP, are becoming increasingly important in the manufacturing of hybrid structures and components for engineering applications. The recent drive towards lightweight construction in the aerospace and automotive industries has led to increased exploitation of lightweight metallic and non-metallic materials with the aim of achieving specifically optimized versatility. Hence, suitable joining methods are necessary in order to reliably join these dissimilar materials and to integrate them in engineering structures. Understanding of the various joining technologies that exist for multi-material structure is consequently important. The objective of this current study is to examine and summarize information and results from previous research and investigations on techniques for joining metal to polymer including CFRP. Specially in this paper, the findings presented serve to further understanding of solid state or laser-assisted conduction heat joining techniques available and optimization of processes for metal to CFRP hybrid joints.

Numerical Modeling and Experimental Validation of the Multi-Material Self-Piercing Rivet (SPR) Joining including CFRP

S. H. Kim(김성호),G. H. Bae(배기현),J. H. Song(송정한),J. S. Lee(이종섭),S. O. Choi(최석우),Y. D. Park(박영도),C. Y. Jung(정철영),N. Park(박남수) 한국소성가공학회 2020 한국소성가공학회 학술대회 논문집 Vol.2020 No.6

알루미늄 기반 Advanced Multi-Material 기술의 선진 동향

이목영(Mokyoung Lee),정성훈(Sung-Hun Jung) 대한용접·접합학회 2016 대한용접·접합학회지 Vol.34 No.5

Global warming is hot issue to keep the earth everlastingly. Despite the increase of the world population and the energy demand, the world oil supply and the oil price are hold the steady state. If we are not decrease the world population and the energy consumption, unforeseeable energy crisis will come in the immediate future. AMT acronym of Advanced Materials for Transportation is a non-profitable IEA-affiliated organization to mitigate the oil consumption and the environment contamination for the transportation. In recent, Annex X Multimaterials Joining was added to enhance the car body weight reduction cause the high fuel efficiency and the low emission of exhaust gas. Multi-materials are the advanced materials application technology to optimize the weight, the performance and the cost with the combination of different materials such as Al-alloy, Mg- alloy, AHSS and CFRP. In this study, the trends of AMT strategy and Al-alloy based multi-materials joining technology were review. Also several technologies for Al-alloy dissimilar joining were investigated.

경도에 따른 고강도 리벳의 전자기 리벳 접합 거동 연구

윤병현,심지연,추동균 대한용접접합학회 2023 대한용접·접합학회지 Vol.41 No.3

Recently, the application of aluminum based on ultra-high strength steel is expanding around high-end models of electric vehicles, so it is necessary to develop strategic welding/joining technologies for these materials. In the case of overseas advanced automobile companies, such development is being carried out at the level of introducing mass production facilities through the development of joining technology, but in Korea, the localization rate of original core technology and related equipment in the field of welding and joining is still very insufficient. Therefore, in this study, in order to develop a high-strength rivet suitable for the rivet process during the multi-material bonding process, cold forging steel was used to attain an appropriate level of hardness through changes in the microstructure through heat treatment. Rivets with different hardness were fabricated through heat treatment, and flaring and tensile test were conducted. As a result of flaring test of rivets, buckling occurred with hardness values of Hv 447 and 486, while cracks occurred without buckling in rivets with hardness values of Hv 506. But as a result of tensile shear test using GA980 and Al5052 materials, there was no significant difference in tensile shear load values according to hardness values of the rivets.

Al5052 합금소재와 고장력강판의 이종재료 클린칭 접합특성

이찬주(Chan Joo Lee),이상곤(Sang Kon Lee),이선봉(Seon Bong Lee),김병민(Byung Min Kim) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.8

차체 경량화를 위해 알루미늄과 같은 경량금속의 사용은 이종소재 사용은 새로운 접합기술을 요구한다. 클린칭 접합은 이종소재 접합기술 중의 하나로 접합소재의 강도차이에 의해 접합특성이 달라진다. 본 연구에서는 Al5052 합금소재에 대한 고장력강판(SPFC440, 590, 780)에 대한 클린칭 접합특성을 평가하였다. 유한요소해석과 인장전단시험을 통해 클린칭 접합특성인 클린칭 접합의 기학적 구속량과 접합강도를 평가하였다. 상부소재가 고장력강판인 경우, SPFC780 은 상부소재의 네킹으로 클린칭 접합이 불가능하였다. 또한 상부소재의 강도가 증가함에 따라 접합강도가 증가하는 특성을 나타내었다. 하부소재가 고장력강판인 경우, 기하학적 구속량인 목두께 및 언더컷과 접합강도는 하부소재의 강도가 증가함에 따라 감소하는 경향을 나타내었다. For manufacturing modern cars, so-called multi-materials, such as aluminum alloy with high-strength steels, are used. For obtaining such materials, a new joining method is required to achieve the multi-material design. Mechanical clinching is one of joining methods used to join the dissimilar materials. The objective of this study is to investigate the characteristics of mechanical clinching of Al5052 alloy to high-strength steels (SPFC440, 590, 780). Using FE-analysis and clinching experiment, the joinability of Al5052 alloy to high-strength steel is evaluated by geometrical shape of mechanical clinched joint, such as neck-thickness and undercut. Further, the joint strength is evaluated by performing a single-lap shear test. The upper high-strength steel SPFC780 was not clinched because of the necking of the upper sheet. The joint strength increased with increasing strength of the upper sheet. For the lower high-strength steel sheet, the joinability and joint strength decreased with increasing strength of the lower sheet

[초청강연Ⅱ] 차세대 자동차를 위한 차체 경량화 기술

박영환(Young Whan Park) 한국자동차공학회 2018 한국자동차공학회 지부 학술대회 논문집 Vol.2018 No.11

전세계적 환경오염에 대한 관심이 많아 지고 있으며, 이에 대하여 각국은 차량의 배기가스를 최소화 하기위한 다양한 규제들이 강화되고 있다. 이에 따라 하이브리드 자동차, 전기 자동차, 연료전지 자동차에 대한 공급이 진행되고 있으며, 이것은 새로운 자동차의 수요를 창출하고 있다. 이러한 자동차에 있어서 차체 경량화는 자동차의 고효율화를 위해 반드시 필요하다. 경량화 10%를 달성할 때 연비의 3.8% 향상 제동 거리의 단축, 배기가스 감축의 효과가 있으며 경량화를위한 전략으로는 알루미늄과 마그네슘과 같은 경량 금속의 채택, CFRP 와 같은 소재의 적용이 대표적인 예이다. 이러한 다종의 소재를 적용하는 방식을 Multi-Material 으로 표현되며, 많은 자동차회사에서 이를 적용하여 차체를 제작하거나 준비중에 있다. 이러한 차체의 제작에 있어서 반드시 필요한 것 중에 하나는 자체의 접합 기술이다. 기존의 단일 소재를 용접하는 방법에서 이종소재의 접합과 용접이 채택될 수 밖에 없으며, 소재적 특성으로 인하여 용접이 불가능한 현상도 발생한다. 이를 극복할 수 있는 방법 중에 하나가 기계적 체결(mechanical joining) 방식의 예를 들 수 있다. 그러므로 본 연구에서는 기계적 접합 공정 중 Clinching, Self Piercing Riveting, Flow Drilling Screw (FDS), Friction Stir Spot Welding 공정을 소개하고, 각 프로세스의 원리, 장점 및 단점에 대하여 분석하고자 한다. 그리고 내구성 강화를 위하여 접착제를 활용한 용접본드와 기계적 접합을 동시에 적용한 하이브리드 접합법에 대한 내용 및 결과를 분석하고자 한다. 이를 통해 향후 국내 자동차 산업의 차세대 자동차에 맞는 차체 생산 기술 및 접합 기술에 대한 동향을 공유하고자 한다.