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TWB 핫스탬핑 공법 적용을 통한 일체형 사이드아우터 부품 개발
김소연(Soyoun Kim),공호영(Hoyoung Kong) 대한용접·접합학회 2015 대한용접·접합학회지 Vol.33 No.6
In the automotive industry, TWB hot stamping process is broadly adapted to reduce weight of the car and improve fuel efficiency. However, the process faces a problem of weakened strength of the welded zone after hot stamping process, due to the fact that Al-Si elements of the coating layer penetrating the welded zone. In this study, filler wires with high percentages of carbon and manganese is adapted during laser welding process to secure the strength of the fusion zone. In addition, wire feeding speed and laser welding speed are optimized by sample test.
Studies on the Coating Materials for Forming Dies of Advanced High Strength Steel Sheets
Sungchul Cha(차성철),Hoyoung Kong(공호영),Iksoo Kim(김익수),Kunuk Park(박건욱),Hyundal Park(박현달) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
To increase the safety and lighten the weight of car body and chassis, the application of advanced high strength steel (AHSS) is being rapidly expanded. Current forming dies with thermal diffusion (TD) of vanadium carbide or coatings (AlTiCrN+MoS2, TiAlN) don’t have enough wear resistance and durability. The coatings shall have complex material properties, e.g. wear, temperature, fatigue resistance and low friction property. The main concept of coating and layer development is to add the low friction property through carbon addition to temperature resistant elements. The toughness, fatigue resistance and bonding are realized through nitrided layer, CrN or TiN and multilayer structure. Total 18 coatings are compared and discussed in this work. As conclusion, TiAlCN and AlTiCrN+CN show the competitive solutions.
박시영(Siyoung Park),김도회(Dohoi Kim),공호영(Hoyoung Kong) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
The B-pillar with TRB (Tailor Rolled Blank) is developed for weight reduction of car body. The reinforcements in the typical B PLR can be replaced by one TRB part which has continuous thickness changes. TRB thickness profile is modified for satisfying IIHS side impact test. The free fall tests have been carried out. The results show that the new B PLR with TRB is 15% lighter than typical structure and has equivalent crashworthiness.