Large Girth Gear for Ball Mill and Grinding Mill

• Customization: Available
• Application: Machinery, Marine
• Hardness: as Requirement
• Model NO.: According to drawings
• Manufacturing Method: Cast Gear
• Toothed Portion Shape: Spur Gear
• Material: Cast Steel
• Type: Circular Gear
• Name: Girth Gear
• Diameter: 8m
• Other Material: Cast Alloy Steel, Cast Carbon Steel, Fo
• Structure From: Integrated, Half to Half, Four Pieces and More Pie
• Heat Treatment: Quenching & Tempering, Normalizing & Tempering, Ca
• Tooth Form: Annular Gear, Outer Gear Ring
• Standard: ISO, En, DIN, AISI, ASTM, JIS, Is, GB
• Transport Package: in Container
• Specification: 15m
• Trademark: citichl
• Origin: China
• HS Code: 8414901900
• Production Capacity: 500 Sets Per Year

Product Description

Large Girth Gear for Ball Mill and Grinding Mill

 

Casting & forging ability
CITICHL is the casting & forging center in central-south China, possessing 50t electric arc furnace, 60t LF ladle refining furnace, and 60t VD/VOD refining furnace, etc. We can pour 350t liquid steel one time and yields more than 200,000t of  high quality liquid steel and can produce the high quality steel of more than 260 steel grades such as carbon steel, structural alloy steel and the structural steel, refractory steel and stainless steel of special requirement. The maximum weight of casting, gray casting, graphite cast iron and non-ferrous casting is 200t, 30t, 20t and 205t separately. 
 
The company is the forging center in central-south China. It is very powerful in forging. The single free forging is 100t(max weight). We can roll rings of different sections of carbon steel, alloy steel, high temperature alloy and non-ferrous alloys such as copper alloy, aluminum alloy and titanium alloy. The maximum diameter is 5.5m and single piece of the forging weighs 10t. We have 8400t, 3150t, 1600t, water press and RAW 200/160-5000/750 large-size ring mill of high precision in Asia made in WAGNER, Germany.
 
Heat treatment ability
The company is the heat treatment base in national machinery trade in central and south China, possessing Φ3×1.6m carburizing furnace, Φ2.3×17m,Φ2.3×9.5m shaft furnace, 8.5×13m,5×15m,6×14.5m,4.5×18m automatic controlled car type heat treatment furnace group. We can supply the quenched and tempered part over 45t, the carburizedand quenched gear and pinion below 20t, shaft≤5.7m in length and the induced girth ring diameter≤5m


Our girth gears Features
Module Range: 10 Module to 70 Module.
Diameter : Min 800mm to16000 mm.
Weight : Max 120 MT single piece.
Three different designs: Fabricated steel - forged ring - rolled plate
Standards/Certificates :• UNI EN ISO • AWS • ASTM • ASME • DIN
Girth gear cutting machines
Φ16m CNC hobbing Machine
Φ12m Gear cutting machine (Switzerland)
Φ10m hobbing machine (Germany)
Φ4m CNC high speed hobbing machine (Germany)
Φ1.6m Horizontal CNC hobbing machine (Germany)
Φ5m CNC profile gear grinding machine (Germany)
Φ2.8m CNC Profile gear grinding machine (Germany)
Φ1.25m CNC Profile gear grinding machine (Germany)
Φ1m CNC Profile gear grinding machine (Germany)

Specifications of Gear :

No.	Item	Description
1	Diameter	≤15m
2	Module	≤45
3	Material	Cast Alloy Steel, Cast Carbon Steel, Forged Alloy Steel, Forged Carbon Steel
4	Structure From	Integrated, Half to Half, Four Pieces and More Pieces
5	Heat Treatment	Quenching & Tempering, Normalizing & Tempering, Carburizing & Quenching & Tempering
6	Tooth Form	Annular Gear, Outer Gear Ring
7	Standard	ISO, EN, DIN, AISI, ASTM, JIS, IS, GB

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

Facilities For Manufacturing Gear ring:

No.	Item	Description
1	Smelting & Casting Capability	40t ,50t, 80t Series AC Electric Arc Furnace 2×150t, 60t LF Ladle Refining Furnace 150t, 60t Series VD/VOD Furnace 20×18m Large Pouring Facility We can pour 900t refining liquid steel one time, and achieve vacuum poured 600t steel ingots. We can produce the high quality steel of more than 260 steel grades as carbon steel,structural alloy steel and the structural steel, refractory steel and stainless steel of special requirement. The maximum weight of casting steel, gray casting, graphite cast iron and non-ferrous casting is 600t, 200t, 150t and 20t separately.
2	Forging Capability	The only one in the word, the most technologically advanced and the largest specification18500t Oil Press, equipped with 750t.m forging operation machine 8400t Water Press 3150t Water Press 1600t Water Press Φ5m High Precision Ring Mill ( WAGNER,Germany) Φ12m High Precision Ring Mill We can roll rings of different sections of carbon steel, alloy steel, high temperature alloy steel and non-ferrous alloys such as copper alloy, aluminum alloy and titanium alloy. Max. Diameter of rolled ring will be 12m.
3	Heat Treatment Capability	9×9×15m,8×8×12m,6×6×15m,15×16×6.5m,16×20×6m ,7×7×17m Series Heat Furnace and Heat Treatment Furnaces φ2.0×30m,φ3.0×5.0m Series Heat Treatment Furnaces φ5.0×2.5m,φ3.2×1.5m,φ3.0×5.0m,φ2.0×5m Series Carburizing Furnaces & Nitriding Furnaces & Quenching Bathes φ2.0×30m Well Type CNC Electrical Furnaces Φ3.0×5.0M Horizontal Gas Temperature-differential Furnace Double-frequency and Double-position Quenching Lathe of Pinion Shaft
4	Machining Capability	1. ≥5m CNC Heavy Duty Vertical Lathes 12m CNC Double-column Vertical Lathe 10m CNC Double-column Vertical Lathe 10m CNC Single-column Vertical Lathe 6.3m Heavy Duty Vertical Lathe 5m CNC Heavy Duty Vertical Lathe
		2. ≥5m Vertical Gear Hobbing Machines 15m CNC Vertical Gear Hobbing Machine 10m Gear Hobbing Machine 8m Gear Hobbing Machine 5m Gear Hobbing Machine 3m Gear Hobbing Machining
		3. Imported High-precision Gear Grinding Machines 0.8m~3.5m CNC Molding Gear Grinding Machines
		4. Large Boring & Milling Machines 220 CNC Floor-mounted Boring & Milling Machine 200 CNC Floor-mounted Boring & Milling Machine 160 CNC Floor-mounted Boring & Milling Machine

We made the large girth gear for the Vietnam customer's shipping photo:











FAQ
Q: How about the quality of your products?
A: Our machines are manufactured strictly according to national and international standards, and we take a test on each equipment before delivery.
 
 
Q: How about the price?
A: We are manufactory, and we can give you lower price than those trade companies. Besides, customers from Made in China can get a discount.
 
Q: Do you provide after-sale service?
A: Yes. The warranty period of our machines is one year, and we have a professional after-sale team to promptly and thoroughly solve your problems.
 
Q: Do you provide equipment operation training?
A: Yes. We can send professional engineers to the working site for equipment installation, adjustment, and operation training. All of our engineers have passports.