Model Number: Rotary kiln Girth Gear and ball mill Girth Gear
Application: Rotary kiln and ball mill
Dimensions: Rotary kiln Gear and ball mill Girth Gearball mill Girth Gear
Girth Gear: Rotary kiln Girth Gear and ball mill Girth Gear
Diameter: Min 100 mm to16000 mm Girth Gear
Weight: Max 120 MT single piece
module range: 10 Module to 70 Module
Standards/Certificates: UNI EN ISO, AWS , ASTM ,ASME , DIN
Maximum module: 45 by hob
Applications: Our girth gears are applied in the cement and minerals industries
Kiln Girth Gears: We are leading supplier the Kiln Girth Gears for the various plants
ball mill Girth Gear: applied in the cement and minerals industries
Gear Cutting Machines: 16m CNC Hobbing Machine
Gear Cutting Machines include
- Ø16m CNC Hobbing Machine
- Ø12m Gear Cutting Machine (Switzerland)
- Ø10m Hobbing Machine (Germany)
- Ø4m CNC High Speed Hobbing Machine (Germany)
- Ø1.6m Horizontal CHC Hobbing Machine (Germany)
- Ø5m CNC Profile Gear Grinding Machine (Germany)
- Ø2.8m CNC Profile Gear Grinding Machine (Germany)
- Ø1.25m CNC Profile Gear Grinding Machine (Germany)
- Ø1m CNC Profile Gear Grinding Machine (Germany)
- Ø0.8m CNC Profile Gear Grinding Machine (Germany)
- Automatic positioner
Avantages of fabricated girth gears
- The forged material structure excludes the risk of inclusions
- Structure defects like gas holes, micro shrinkage, pin holes, hot tears, sand and slag inclusions are avoided
- Hence, repair welding of the body structure and e.g. grinding of toothed areas is not required.
- The fabricated manufacturing procedure excludes the need for patterns and risers
- Rim material has higher hardness and higher strength than the material used for the underlying structure (i.e. web, gussets)
- External teeth
Maximum diameter: 16000 mm
Toothed face width: 1700 mm
Maximum module: 45 by hob
Maximum module: 65 gear finishing cutter
- Internal teeth
Maximum Diameter: 6500 mm
Maximum module: 25.4
Toothed face width: 400 mm
The technical requirements
1) is pretreated before normalizing surface hardening treatment, the hardness should HB210 ~ 250; mechanical performance are the ultimate strength Rb \ 690MPa, yield stress Rs \ 490MPa, elongation D5 \ 11%, reduction of area W \ 25% , impact toughness Ak \ 30J; teeth induction hardened, hardness HRC50 ~ 55; effective hardened layer depth \ 3 ~ 5mm.
2) overall ultrasonic flaw detection, internal quality should meet two requirements GB7233-87 standard requirements; tooth and fillet magnetic particle inspection, quality should meet two requirements GB/T9444-88 standards.
3) Note the casting is not rounded R5 ~ R10.
4) Tooth chamfer at both ends and 1 45b.5) by two and a half ring gear tooth width of each ring coupling along the edge of a whole ring made with high strength bolts, combined with the tooth surface must be at the bottom center.
2 large ring gear manufacturing process
2.1 of rough
Steel casting blank is provided by CITIC Heavy Machinery Co., Ltd. Heavy Forging plant, run by GB11352-89 standard specifies requirements for modeling according to the casting process, smelting, casting, hit boxes, cleaning, dressing castings;. During inspection and acceptance by the drawings and Technical requirements for steel blank
Checks, according JB/T6402-92 standards issued after acceptance
Crossed by drawing and stay out allowance, alignment, connection, processing both inside and outside the circle, combining face milling, drilling and other processes.
2.3 Exploration injuryOverall ultrasonic flaw detection, internal quality should meet the two requirements of GB7233-87 standards.
2.4 normalizing pretreatment
Semi-ring pairs normalizing and tempering treatment, provide a good organization for subsequent surface hardening; press drawings deformation of the half ring gear inspection after heat treatment.
First two and a half ring is made with high strength bolts connecting the ring as a whole, the overall process by drawing a circle Quannei Wai teeth and upper and lower end, and then drawing and machining milling process requirements.
2.6 Elimination of processing stress
The overall ring annealed to eliminate stress.
2.7 overall ring surface hardening
IF along the alveolar tooth surface induction hardening, hardness HRC50 ~ 55, effective hardened layer depth \ 3 ~ 5mm.
2.8 Final inspection
First, the detection frequency quenching, the hardness after tempering ring gear cogging meets the requirements of the drawings; secondly, to detect whether the maximum outer diameter larger size D6944 as the deformation \ 3mm, the mechanical correction required until qualified; Thirdly, tooth and fillet magnetic particle inspection, quality should meet two requirements GB/T9444-88 standard requirements; Finally, according to the drawings and technical requirements for final inspection.