high speed ball slewing ring bearing in stock

Why do slewing ring bearings need to grind their teeth?

With the continuous development of industrial machinery, there are higher and higher requirements for the transmission stability,

transmission accuracy and bearing capacity of the motor-driven pinion and the slewing ring gear. Regarding the slewing ring bearing,

whether it is external or internal, the normal processes include gear shaping, gear hobbing, and gear milling.

According to the design standards, the general gear accuracy is grade 8 or grade 9.

Rough insertion and fine insertion can reach grade 7 tooth precision. The tooth precision is mainly reflected in the rotation precision. Specific indicators:

1. Cross pitch and common normal length

2. Common normal deviation

3. Tooth jump (tooth jump of finished turntable bearing)

4. Tooth width, tooth thickness, tooth shape and tooth direction, etc. (generally not marked in the drawing)

In order to improve the strength, hardness, wear resistance and toughness of the ring gear and gear, we usually use surface quenching on the teeth of the ring gear when machining the slewing ring bearingSlewing Bearing teeth. If the tooth quenching is not performed, the overall performance of the ring gear will decrease Easily damaged, etc. Tooth quenching has a great influence on the tooth accuracy.

After quenching, the ring gear will appear elliptical deformation, and the accuracy level will decrease.

If the tooth accuracy requirements are high, the design requirements are usually not met after quenching.

If you want to achieve higher tooth accuracy after quenching, you need to Finishing the teeth, but the hardness of the teeth after quenching is high,

and the conventional gear shaping or gear hobbing process cannot process the quenched teeth.

We usually use the grinding process. What is grinding? The grinding wheel is used as a tool to grind the processed gear tooth surface to improve the gear precision and surface roughness.

It is suitable for steel gears with high hardness after quenching.

Grinding teeth can achieve high surface roughness, and the quenched teeth can reach Ra0.8 surface roughness through grinding, and the tooth jump can reach 0.03-0.1mm. Grinding can correct the deformation of the gear during the heat treatment process, ensure the accuracy of the finished gear, improve the meshing accuracy, achieve the purpose of precise transmission, and reduce vibration and noise.

The slewing ring bearing and gear are ground to improve the roughness of the teeth and improve the accuracy level of the teeth. The grinding teeth can generally reach the 5th or 6th grade tooth accuracy, which provides the precision slewing bearing with the pinion to achieve high precision and small backlash transmission. a solid foundation