The necessity of gear grinding for the slewing bearings.
This article clarifies the necessity of grinding teeth and the technical requirements to be achieved for the slewing bearings of the rotary table. As a process to be achieved for a precision bearing, it is necessary to indicate the situation of grinding teeth and how to achieve the technical requirements.
As for the rotary table bearing or slewing bearing, no matter the outer teeth or inner teeth, or helical teeth, etc., the normal process level includes gear shaping, gear hobbing and gear milling. According to the design technical standard, the general standard of gear accuracy is grade 9 or grade 10.
In this case, the inspection indexes of grade 9 teeth or grade 10 teeth are based on the design standard of a rotary table bearing in JB / T10471, and can also refer to JB / T2300. It mainly reflects the rotation accuracy, and the specific indicators are as follows:
1. Number of teeth span and common normal length
2. Common normal deviation
3. Tooth runout (tooth runout of finished rotary table bearing)
4. Tooth width, tooth thickness, tooth shape, and tooth direction are generally not marked separately in the drawing.
In short, the grade 9 teeth or grade 10 teeth of the slewing bearing are simply the same. In terms of the design concept, the common normal line of grade 7 and grade 8 teeth, tooth runout also meets the design requirements.
However, the tooth surface quenching has a great influence on the accuracy level of the tooth surface, which is generally one level backward.
This article describes the necessity of gear grinding and the technical indicators that can be achieved.
1. Improve engagement accuracy
2. Tooth runout 0.06-0.15mm
3. Tooth surface roughness Ra0.8
4. Reduce engagement noise
5. Reduce the wear strength of tooth surface
Therefore, if we want to reach the above technical requirements, we must grind the teeth.
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