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Hardening steels are used when great strength, high endurance limit, toughness, and resistance to shock are required. These qualities are governed by the kind of steel and treatment used. Fairly high surface hardnesses are obtainable in this group, though not so high as those of the casehardening steels. For that reason, the resistance to wear is not so great as might be obtained, but when wear resistance combined with great strength and toughness is required, this type of steel is superior to the others. Thru-hardening steels become distorted to some extent when hardened, the amount depending upon the steel and quenching medium used. For that reason, thru-hardening steels are not suitable for high-speed gearing where noise is a factor, or for gearing where accuracy is of paramount importance, except, of course, in cases where grinding of the teeth is practicable. The medium and high-carbon percentages require an oil quench, but a water quench may be necessary for the lower carbon contents, in order to obtain the highest physical properties and hardness. The distortion, however, will be greater with the water quench.

When the grinding of gear teeth is not practicable and a high degree of accuracy is required, hardened steels may be drawn or tempered to a hardness that will permit the cutting of the teeth. This treatment gives a highly refined structure, great toughness, and, in spite of the low hardness, excellent wearing qualities. The lower strength is somewhat compensated for by the elimination of the increment loads due to the impacts which are caused by inaccuracies. When steels that have a low degree of hardness penetration from surface to core are treated in this manner, the design cannot be based on the physical properties corresponding to the hardness at the surface. Since the physical properties are determined by the hardness, the drop in hardness from surface to core will give lower physical properties at the root of the tooth, where the stress is greatest. The quenching medium may be either oil, water, or brine, depending on the steel used and hardness penetration desired. The amount of distortion, of course, is immaterial, because the machining is done after heat-treating.

Wind gears Specification

Precision gears specification

External Gears and external splines
	Milling	Hobbing	Shaping	Tooth grinding
Max O.D	5000mm	1200mm	2000mm	5000mm
Max face width	2200mm	1600mm	1100mm	2200mm
Max module	M35	M35	M24	M40
AGMA leval/DIN leval	DIN3962 CLASS 7	DIN3962 CLASS 7	DIN3962 CLASS 8	DIN3962 CLASS 3
Tooth surface finishing	Ra3.2	Ra3.2	Ra3.2	Ra0.4
Max helix angle	+30°/-45°	±45°	0°	±45°

Precision Gears we could provide

	Planetary Gear Planetary gears, also called epicyclic gear trains, are used in complex applications that require smooth torque transmission, such as drivetrains and automotive transmissions. The spur gear used by planetary gears is called a “sun spur,” which is surrounded by three-plus exterior gears called planet gears
	Internal Gear Planetary gears, also called epicyclic gear trains, are used in complex applications that require smooth torque transmission, such as drivetrains and automotive transmissions. The spur gear used by planetary gears is called a “sun spur,” which is surrounded by three-plus exterior gears called planet gears
	Spur Gear The spur gear, also called a straight-cut gear, is the simplest type of gear available. Straight-sided along the gear wheel’s axis, with straight teeth in line with the axis. Other types of spur gears transmit motion and torque laterally through compatibility with other parallel aligned gears. Such gears are main components in planetary gears.
	Spline Gear Spline gears are either cylindrical or rod-shaped with straight teeth that allow them to transmit motion laterally by fitting inside internal devices or gears.
	Helical Gear Helical gears are fast rotating gears capable of supporting heavy loads efficiently and smoothly. They feature teeth inclined towards the axis of the shaft and positioned like a helix, thus the name. Quieter than many other gears, including spur gears, helical gears are popular with applications that feature both radial loads and thrust loads.
	Double helical gear Double helical gears are a type of helical gear that has two helical faces next to each other with a gap between them. The helix angles on each face are identical but opposing. The use of a twin helical gear set lowers thrust loads and allows for even more tooth overlap and smoother operation.

Precision gears application

About Guangda for the gears manufacturing

1. Professional manufactuer for the gears with efficient technical team with an emphasis on cost effective production.

2. Guangda has material line and machining line could provide gear blanks and finished gears .

3. Customerized and one-stop to meet customer's requirements, provide the overall solution to customers .

4. More than 100 sets of professional gear machining equipment including PAMA,Gleason,Danobat,Kehren,Nicolas,Pierto carnaghi of the most advanced equipment in the world.

5. More than 70 sets of the gear heat treatment equioments including the nitriding ,tempering and carbonization for the gears .

6. Guangda is the largest supplier to the world's top three customers NGC,ZF and Siemens for the gear box parts.

7. In Chinese market, Guangda wind turbine gear steel ranks first in China for the capacity, quality and market share.

Guangda is a leading manufacturer of gear box parts of the manufacturing specializing in gear box parts forging and precision machined and custom solutions in a variety of sizes and types. We provide different kind of products for the gear box parts including planet shaft ,sun shaft ,planet gear, internal ring gear, planet carrier ,head cover ,turque arm etc.

Completed supply chain--Guanda has the ability from Material of smelting ,forging ,heat treatment to the precision machining and the final surface treatment.

Comparing with companies who only make the material , we directly face the end customers and better understand customer's demand. Compared with comapanies who only do the processing, we can accurately control the quality of materials to meet the technical requirements of customers. In this way we could provide a holistic solution and control the cost of the whole process, meet the delivery time, and resist market risks.

Guangda pursues excellence & innovation with tight quality control & the most advanced technology in the industry.

All products are manufactured with the most advanced and modern equipment of PAMA,Gleason,Danobat,

Kehren,Nicolas,Pierto carnaghi and efficient technical team with an emphasis on cost effective production.

Guangda has deep and long cooperation with NGC ,Voith ,Flender and ZF for supplying the gear box parts . In Chinese market, Guangda wind turbine gear steel ranks first in China for the capacity, quality and market share .And Guangda is the largest supplier to the world's top three customers NGC,ZF and Siemens for the gear box parts.

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