YULKOK LTD.

Center of excellence for Wing bottom panel stringers

A320 Series(full rate) Wing bottom panel stringer

• Material : Al Ext, 2026-T3511 , 1.2m~16.0m Long
• Production rate : 1200 pcs/mon (Current)
  ⇒ 1500 pcs/mon (Sancheong Feb. 2017)
  ⇒ 2500 pcs/mon (Sancheong Max capa)

Center of excellence for wing ribs

A350 Wing-Rib RSP program between Airbus & KAI

• Material : Al alloy (Al7050-T7451 plate)
• Material Size (Rib #16) : 130 x 655 x 2,995mm
• Material Weight 714kg → Part weight 18kg
• Yulkok had participated from design phase

B777 Fixed Leading Edge Ribs

• Material : AL Plate, AL7050T7351
• # of Detail Parts : 138 Items, Tight Tolerance Parts → Hole size .0005in & True Position .002in

B787 Flap Support Ribs

• Material : AL Plate, AL7050T7351
• # of Detail Parts : 130 Items, Tight Tolerance Parts → Hole size .0007in & True Position.014in

Machining of complicated spar chord

B737 Empennage Spar Chords

• Material : Al Ext, 7150-T77511 , 120″~300″ Long
• Process : Hot Forming → Machining → Incremental Forming → Inspection

High speed machining of Heavy Structure

A350 NLG Bay Lateral Panel & Gantry

• Material : Al-Li, Al2050-T84, t160 X 1,400 X 3,790(mm)
• Equipment : DST ECOSPEED F1040(Max 30,000 RPM, Max Feed rate 20 m/min)

Machining of complicated process

B787 MLG Beam

• Material : Al Forging, 7085-T7452, t315 X 710 X 4,230(mm)

Machining of Hard metal - Titanium

P-8A Ti-Spar & Fitting

• Material : Ti Ext. Ti-6AL-4V , 3,430~3,940Long(mm)

B787 Pivot Bulkhead Titanium parts

Extensive experiences of hard metal machining for 25 years

• T-50 wing attach fitting (Ti)

  

• B737 Y-Fitting (Ti)

  

Machining of Engine Component - Ni Alloy (Inconel 718, 783, 909)

• CF34 FWD case

  

• Genx STK ring

  

• F100 Case

  

• GE Leap case

  

• Launch vehicle case

  

Machining of Engine Component - Al

• CF34 Al Front case

  

• GE90 Al Outlet guide vane