Before needle tooth shell machining
RV reducer needle tooth shell internal gear broaching and internal and external circular end face grinding solution
Needle tooth shell and its inner gear ring:
Needle tooth shell: A key component in RV reducers or cycloidal needle wheel reducers, typically an annular shell with a precision inner gear ring.
Inner gear ring: The gear ring on the inner wall of the needle tooth shell. This gear ring is not an ordinary involute gear tooth, but a precision tooth groove used to accommodate needle pins. The needle pins mesh with the cycloidal wheel to achieve speed reduction transmission.
Precision requirements: The tooth profile accuracy, cumulative pitch error, and surface roughness of the inner gear ring are extremely high (usually at the micrometer level), directly determining the transmission accuracy, backlash, noise, and life of the reducer.
Broaching process
Finished needle tooth shell
Needle tooth shell details
Broaching:
Principle: Broaching is a machining method that uses a multi-tooth tool (broach) to cut along a straight or spiral trajectory. Each tooth on the broach is slightly higher (or wider) than the previous one. When the broach is steadily pulled through the workpiece (needle tooth shell) with the strong pulling force of the broaching machine, each tooth removes a thin layer of metal in turn, finally forming the required tooth shape (or hole shape) on the inner surface of the workpiece.
Features:
High precision: The final tooth shape can be machined in one stroke, with high precision and good tooth shape consistency.
High efficiency: Multiple teeth participate in cutting simultaneously, with short strokes and high production efficiency.
Good surface quality: The cutting process is stable, and a lower surface roughness can be obtained.
Suitable for mass production: Single-piece machining efficiency is extremely high, making it very suitable for mass production.
Needle tooth shell grinding
For efficient and precise machining of needle tooth shells, a Vertical Grinding Center is the ideal solution for one-time clamping and forming of outer circle, end face, and inner hole features.
