مسبوكات صناعية دقيقة
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Heavy Equipment
Axle housing casting (off-highway truck, ~2495 lbs)
Cast Steel ASTM A27 Gr70-40 / A148 Gr80-50; Low alloy 4340 equivalent for heavy-duty
Axle bore concentricity and perpendicularity critical. Gear tooth contact pattern after assembly. Shot blast + epoxy paint.
Heavy Equipment
Arm casting (excavator attachment arm, ~576 lbs, ZX-650 / EX1200)
Cast Steel ASTM A148 Gr105-85 / Gr120-95 (high strength for fatigue)
Fatigue critical – excavation loading. Pin bore tolerance and perpendicularity to arm axis critical. Charpy impact test at −20°C recommended. PPAP for production parts.
Heavy Equipment
Boss casting (~469 lbs)
Cast Steel A148 Gr80-50 / Gr105-85; low alloy
Welded-in boss or integrated boss in boom/arm assembly. Pin bore – H8/h7 tolerance. Weld preparation per EN 15085 or AWS D1.1.
Heavy Equipment
Bracket – center support (~500 lbs); Rear support (~2314 lbs)
Cast Steel A27 Gr70-40 / A148 Gr80-50
Structural attachment to mainframe. Weld-on or bolted interfaces as designed. OEM drawing controlled.
Heavy Equipment
Bucket tooth adapter (cast steel, ground engagement tool)
Alloy Cast Steel Cr-Mo-B grade; 35CrMnSiA equivalent; some Hadfield Mn for extreme duty
GET (Ground Engagement Tool). Tooth/adapter interface geometry: Caterpillar J-series, Komatsu Tooth system, Esco etc. – pattern controlled. Surface hardness by heat treatment not weld overlay.
Heavy Equipment
Cap bearing casting (~43 lbs)
Cast Steel A27 / A148 Gr80-50; some designs in ductile iron GJS-500-7
Small precision casting – dimensional accuracy on bearing bore critical. Investment casting option for improved surface finish.
Heavy Equipment
Drop tube casting (off-highway truck, ~179 lbs)
Cast Steel ASTM A27 Gr70-40 / A148 Gr80-50
OEM dimensional controlled. Surface: epoxy primer. Interface machining to critical tolerances.
Heavy Equipment
Frame support casting (off-highway truck, ~926 lbs)
Cast Steel ASTM A148 Gr105-85 / ASTM A27 Gr70-40; Low alloy cast steel (0.3C-1Mn-0.5Mo)
OEM drawing controlled (CAT, Komatsu, Liebherr, HITACHI reference). High cycle fatigue at frame joints – casting soundness class to ASTM E446 Level 2 or better. Shot blast + epoxy primer.
Heavy Equipment
Front wheel hub casting (~1726–1755 lbs)
Cast Steel ASTM A148 Gr105-85; Low alloy steel (Mn-Cr-Mo)
Large haul truck (150–400 tonne payload). Hub bore and flange face perpendicularity critical for wheel assembly. Fatigue classification per OEM.
Heavy Equipment
H-Link casting (~621 lbs)
Cast Steel A148 Gr105-85 / Gr120-95
Two-pin geometry – both bore centres and parallel alignment critical. Fatigue life dominated by casting soundness and bore geometry.
Heavy Equipment
Idler casting (front idler / carrier roller)
Cast Steel A148 Gr80-50 / Gr105-85; Alloy steel for wear
Track contact surface hardness and concentricity critical. Sealed and lubricated roller bearing interface machined to H7.
Heavy Equipment
Member casting – 100T truck (1477–1763 lbs, model 785-7)
Cast Steel A148 Gr80-50 / Gr105-85; low alloy Mn-Mo
Heavier truck – higher strength grade required. First article inspection (FAI) with CMM report. OEM drawing / PPAP controlled.
Heavy Equipment
Member casting – 65T truck (462–553 lbs, model 465-E0)
Cast Steel ASTM A27 Gr70-40; Low alloy cast steel
Frame member / cross-member node. OEM model-specific geometry. Surface: epoxy primer.
Heavy Equipment
Pivot housing casting (~315 lbs)
Cast Steel A148 Gr80-50 / Gr105-85; low alloy for wear resistance
Articulation pivot. Bore tolerance critical for pin fit. Bushing interface or direct pivot pin. Weld repair procedure qualified.
Heavy Equipment
ROPS support casting (~73 lbs)
Cast Steel A148 Gr105-85 (high strength mandatory for safety structure)
ROPS (Roll Over Protective Structure) – safety critical. ISO 3471. High toughness and strength mandatory. Proof load test per ISO 3471 / SAE J1040.
Heavy Equipment
Rear axle housing casting (~7604 lbs, large mining truck)
Cast Steel A148 Gr80-50 / Gr105-85; low alloy Mn-Cr-Mo
One of the largest haul truck castings. Solidification simulation mandatory (MAGMA/ProCAST). Wall thickness min 40mm+. OEM PPAP required. Weld repair: pre-qualified WPS.
Heavy Equipment
Rear support casting (off-highway truck, ~615 lbs)
Cast Steel A27 Gr70-40 / A148 Gr80-50
Suspension mounting interfaces machined. OEM drawing controlled.
Heavy Equipment
Rear wheel hub casting (~4849 lbs)
Cast Steel ASTM A148 Gr105-85 / Gr120-95; alloy steel for ultra-class
Ultra class trucks (Caterpillar 797, Komatsu 980E range). Rear hub carries electric drive motor torque arm or mechanical axle. Critical fatigue path – Level 1 soundness.
Heavy Equipment
Saddle support casting (~324 lbs)
Cast Steel A27 Gr70-40 / A148 Gr80-50
Saddle / pivot interface. OEM drawing controlled. Machined mounting faces.
Heavy Equipment
Side link casting (~544 lbs)
Cast Steel A148 Gr105-85
Linkage geometry critical. Matched with H-link and arm pin bores. FAI / PPAP.
Heavy Equipment
Spindle casting (off-highway truck, ~2008 lbs)
Low alloy cast steel 8630 / A148 Gr105-85 (high strength); some designs in Cr-Mo steel
Bearing seat tolerances critical (H7/k6). Fatigue life design – casting soundness essential. PPAP / FAI for first article approval.
Heavy Equipment
Sprocket segment / drive sprocket casting
Alloy cast steel (Cr-Mo-Mn); sometimes Hadfield Mn steel for extreme abrasion
Sprocket tooth profile must match track link pitch and geometry. Mn steel: work-hardens in service. Regular alloy: heat-treated hardness 38–45 HRC.
Heavy Equipment
Steering bracket casting (~419 lbs)
Cast Steel A148 Gr105-85; low alloy steel
King pin bore tolerance critical for steering geometry. Fatigue critical component.
Heavy Equipment
Support LH & RH castings (~346 lbs per side)
Cast Steel A27 Gr70-40 / A148 Gr80-50
Left-hand / right-hand matched pair. OEM model specific.
Heavy Equipment
Support casting – various frame members (~264–670 lbs)
Cast Steel ASTM A27 Gr70-40; Low alloy cast steel
Multiple variants per OEM model. Mounting face machining. Epoxy primer coating.
Heavy Equipment
Track link / chain link casting (crawler undercarriage)
Alloy cast steel (Cr-Mn-B grade); Boron steel equivalent for wear and toughness
High wear and impact environment. Hardness specification tightly controlled – too soft = wear out, too hard = brittle fracture. Pin pitch cumulative tolerance critical for track assembly.
Heavy Equipment
Tube / suspension tube casting (~771 lbs)
Cast Steel A27 Gr70-40 / A148 Gr80-50
Suspension strut or nitrogen-oil cylinder interface. Bore finish critical if suspension cylinder.
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