Yuhuan CNC Machine Tool Co., Ltd.

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Planetary gear ring broaching of an automobile transmission

The broaching process of planetary gear rings in automotive transmissions is a key technology for mass production, high efficiency, and high-precision machining of internal gear rings. Planetary gear rings (also known as internal gear rings) are core components of planetary gear mechanisms. Their tooth profile accuracy, surface quality, and deformation control after heat treatment directly affect the noise, smoothness, and lifespan of the transmission. The broaching process is particularly suitable for the machining of internal gears with complex involute tooth profiles and high consistency requirements.

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Equipment highlights

Spiral internal gear broaching is the perfect combination of precise kinematic control and complex tooling engineering. It achieves high-precision, high-efficiency, and high-consistency spiral gear tooth machining through the rigid synthetic motion of "linear + rotary" and the self-feeding design of the spiral broach.

Process Advantages
1. Ultra-high efficiency: One complete tooth space is machined in one stroke. Combined with high-speed indexing, the cycle time is extremely short, making it the preferred choice for mass production (annual output of hundreds of thousands of units).
2. Excellent consistency: All tooth spaces machined with the same broach have high consistency, ensuring the NVH performance of the gearbox.
3. Good precision: Can stably achieve the precision level required for automotive gears (such as DIN 7-8 level).
4. Excellent surface quality: Precision-cut and calibrated teeth can obtain a smooth tooth surface, which is conducive to subsequent running-in and noise reduction.
5. Suitable for complex tooth shapes: Through broach design, modified teeth (barrel teeth, thinned tooth ends) can be machined to optimize meshing and noise.
6. Mature and reliable process: Used in the automotive industry for many years, with mature equipment, tooling, and process control.

Maintenance and Maintenance of CNC Spiral Vertical Internal Broaching Machine:
1. Regularly check system components: Regularly check various parts of the machine tool, such as transmission devices, guide rails, panels, and electrical circuits, to ensure they are in good condition.
2. Good cutting requires maintaining a clean and hygienic factory environment, and keeping the computer clean to prevent dust from entering any important components and parts.
3. A way to save lubricant use and ensure its proper operation is to use approved lubricants and use the required amount as instructed.
4. Before use, be sure to check the hardness of the tool, whether the blade is damaged or chipped. Regularly check the degree of tool wear and replace worn blades in a timely manner.
5. Maintaining machining accuracy requires regular calibration, including checking the function of the automatic tool retraction safety switch and the reading accuracy of the X/Y unit.