Large Diameter Girth Gear for Rotary Kilns and Ball Mill

• Application: Machinery, Industry
• Hardness: According to Customer′s Requirement
• Gear Position: External Gear
• Manufacturing Method: Cast Gear
• Toothed Portion Shape: Spur Gear
• Material: Cast Alloy Steel, Cast Carbon Steel, Forged Alloy
• Model NO.: Circular Gear
• Type: Circular Gear
• Name: Girth Gear
• ISO 9001:: 2008 Certificated: BV & SGS Certificated
• Manipulate Way: Forced Manipulation
• Changes Way: Stepped
• Module: Less Than or Equal to 45
• Diameter: 15 M
• Transport Package: in Container
• Specification: According to Customer′ s Requirement
• Trademark: citictic
• Origin: Luoyang, China
• HS Code: 8479909090
• Production Capacity: 500pieces/Year

Product Description

                Large Diameter Girth Gear for Rotary Kilns and Ball Mill
   

Process: 
Forging/Casting
Normalizing&Tempering-Proof Machinnig
Quenching&Tempering
Finish Machining(Teeth Grinding)

We can offer you in various process conditions Solutions for Many End Markets and Applications
--Mining
--Metallurgy
--Power Generation
--Cement Plant
--Port Machinery
--Oil and natural
--Paper making
--OEM gear case
--General Industrial

Specification	Machining Scope
Size	OD Max 15m
	One Piece of Gear: OD Max 13m
	Assemble Gear: According to drawings
Hobbing Modulus	10-60
Milling Modulus	Up to 120
Spiral Modulus	1-15
Accuracy Grade	Milling: 6 grade
	Hobbing: 8 grade
Material	Alloy steel: 42CrMo4, 34CrNiMo6 etc.
	Carbon steel: C45E, 1030
	Carburizing steel
	Quenched and tempered steel
Heat treatment	Quenching & Tempering, Surface Quenching
Teeth Profile	Spur, Helical, Herringbone, Crown, Spiral, Worm and shaft

Inspection and Test Outline of Girth Gear:

No.	Item	Inspection Area	Acceptance Criteria	Inspection Stage	Certificates
1	Chemical Composition	Sample	Material Requirement	When Smelting After Heat Treatment	Chemical Composition Report
2	Mechanical Properties	Sample(Test Bar on the Gear Body)	Technical Requirement	After Heat Treatment	Mechanical Properties Report
3	Heat Treatment	Whole Body	Manufacturing Standard	During Heat Treatment	Heat Treatment Report Curves of Heat Treatment
4	Hardness Test	Tooth Surface, 3 Points Per 90°	Technical Requirement	After Heat Treatment	Hardness Teat Report
				After Semi Finish Machining
5	Dimension Inspection	Whole Body	Drawing	After Semi Finish Machining	Dimension Inspection Report
				Finish Machining
6	Magnetic Power Test (MT)	Tooth Surface	Agreed Standard	After Finish Gear Hobbing	MT  Report
7	UT	Spokes Parts	Agreed Standard	After Rough Machining	UT Report
				After Welded
				After Semi Finish Machining
8	PT	Defect Area	No Defect Indicated	After Digging After Welded	PT Record
9	Mark Inspection	Whole Body	Manufacturing Standard	Final Inspection	Pictures
10	Appearance Inspection	Whole Body	CIC's Requirement	Before Packing (Final Inspection)
11	Anti-rust Inspection	Whole Body	Agreed Anti-rust Agent	Before Packing	Pictures
12	Packing Inspection	Whole Body	Agreed Packing Form	During Packing	Pictures

 Testing Process:
· QA DOC: Chemical Composition Report, Mechanical Properties Report, UT Report, Heat Treatment Report, Dimensions Check Report
· The data on chemical composition report and mechanical properties report are approved by third party, Luoyang Ship Material Research Institute, CSIC.
· UT test: 100% ultrasonic test according to EN10228-3, SA388, Sep 1921 C/c etc.
· Heat Treatment Report: provide original copy of heat treatment curve/time table.