Rotary Kiln Girth Gear

Rotary Kiln Girth Gear is one of the main components of rotary kiln, ball mill and other equipment.
Among them, the large ring gear of the rotary kiln is a key part of the rotary compaction transmission device, and its installation quality directly affects the stability of the rotary compaction transmission system, the stability of the rotary compaction operation, the service life of the compaction lining and the operation of the rotary compaction. Therefore, the quality of the large ring gear is very high in actual production.

Ring gears can also be called internal cylindrical gears, which have the same standard as external cylindrical gears, except that the teeth are cut into the inner diameter while keeping the outside smooth.

Ring gears provide a compact solution that significantly reduces speed and sliding wear, and can be used in a wide variety of equipment and applications.

Ring gears are widely used in light duty applications.
The ring gear eliminates the need for a love wheel when two parallel shafts need to be rotated in the same direction.
The performance of the large ring and pinion gears depends on the ratio of the grooves in the ring and pinion gears.
The greater the ratio, the greater the force generated.
The large ring gear and pinion are also designed with teeth that help the drive shaft to generate enough of the required torque.
Compared to the pinion, the ratio of the teeth and groove sizes of the ring gear must be equal, otherwise they will wear out.

Large ring gear machining can use a variety of materials to manufacture ring gear parts, such as: steel, stainless steel, gray cast iron, brass, bronze, cast iron, heat treated steel, tool steel, ductile iron, copper and aluminum.

The main production process of Rotary Kiln Girth Gear machining can be divided into six stages

1. Blanking
Raw steel is rolled from straight bar into coiled form.
Coiled steel is slit or cut on the centerline to separate the coil into individual annular blanks.
Then separate each rim in the form of a ring. Remove excess welding flash from the ring.

2. Machining
At this stage, turns are involved.
Generally speaking, it can be divided into two steps.
Start by rotating the ID and finishing the surface. This step takes 1-1.5 minutes to complete.
Then, in a second step, the outer diameter and outer surface are flipped.
This step takes the same amount of time as the first step

3. Hob
Gear hobbing is about the process of cutting the outer diameter of a machined ring into gear teeth by means of a tool called a hob.
Hobbing is done on a machine called a “gear dresser”.

4. Chamfering
After the teeth are formed, the product is ready for the chamfering stage.
During this manufacturing stage, a chamfering tool cuts a sharp edge into the side of the ring that engages the mating shaft. The chamfer provides an easy mating engagement in this area, reducing mating friction for improved functionality.
The time required for this stage is approximately 1-2 minutes.

5. Deburring and washing punching
This stage involves removing loose metal debris and cleaning the gears with anti-rust oil.
These activities take a minute to complete.

6. Induction hardening
Parts can be customized to meet specific application requirements by modifying process parameters such as heating source, cycle time, temperature, quench medium, and tempering cycles.
These same compressive stresses prevent tooth fatigue from bending of the ring gear.
The purpose of this stage is to increase the surface hardness of the gear teeth and to control the depth of the hardness according to the desired requirements.


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