Castings And Forgings Cement Mining Industry Ring Gear

We provide girth gears in three different designs

Fabricated steel
- forged ring
- rolled plate

Cast steel

Ductile (Nodular) cast iron

Fabricated gears became more common in the past and are constructed with forged steel gear rim materials and electro welded body structure. The rings are manufactured from a whole block of high resistance alloy steel. After the rough machining of the ring, we carry out hardening and tempering heat treatment in order to improve the mechanical characteristic and therefore its relevant performance.

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)

These features will reduce the lead time and costs. Fabricated manufacturing ensures a fast delivery.

This is especially beneficial in an emergency situation, where the existing gear rim is suffering from damage

Features

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

Applications
Our girth gears are applied in the cement and minerals industries:
• Various types of horizontal mills
• Rotary dryers
• Rotary kilns
• Any other large gear ring application

The technical requirements of a large ring:
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 ZTIC 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
Down procedure.
2.2 roughing
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 injury
Overall 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.
2.5 Machining
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.

Product Display of Castings And Forgings

Castings And Forgings

FAQ

Q: Why we believe in luoyang zhongtai industries co., ltd:
A: 1. More than 30 years experience.
2.We are the leading professional supplier of mining machinery, construction machinery, machines casting and forged parts.
3. All products achieved ISO9901:2000 quality management certificate and CE, ROHS certificates.

Q:Delivery time:
A: Parts lead time 1-2months, machines 2-3months.

Q:Payment terms:
A: Accept payment type: T/T, L/C, Western union,Cash.
30% deposit when signed contract. Full payment paid before shipping.

Q: Quality warranty?
A: Guarantee time: one year for main machinery. If something wrong we will provide the technical advice and find solution immediately. For those wearing parts we guarantee high quality parts for long-term supply.

Q: After sales service?
A: We can supply technical guide for machines running test and parts maintenance if end user needs.

After Sales Service

ZTIC Heavy Industries is your business partner in the After Market.
ZTIC able to provide:
1. ENGINEERED SPARES - DESIGN AND MANUFACTURING
2. LARGE VOLUME STEEL AND IRON CASTING FOUNDARIES
3. HUGE MACHINE SHOP CAPABILITIES
4. TRAINING PROGRAMMES
5. PREVENTATIVE MAINTENANCE PROGRAMS
6. PREVETATIVE MAINTENANCE SERVICES
7. COMPREHENSIVE MAINTENANCE PROGRAMS