The core technology of CNC gear hobbing machines has achieved high-precision, high-efficiency automated machining, and is widely used in the automotive, aerospace, and other fields. Its key technology is based on the generating method principle, using a CNC system to precisely control the relative motion between the hob and the workpiece, achieving efficient machining of various tooth profiles such as spur gears, helical gears, splines, and worm gears.
Main technical features include:
Electronic Gearbox (EGB) Technology: Modern CNC gear hobbing machines use electronic gearboxes to replace traditional mechanical transmission chains. Through software settings of gear ratios and differential compensation, there is no need to change physical gear trains, significantly improving adjustment efficiency and machining flexibility. Operators only need to input parameters such as the number of teeth and module for automatic operation, without the need for programming.
Multi-axis Linkage and Direct Drive Technology: High-end models are five-axis or even seven-axis CNC machines, supporting four-axis linkage (such as B, C, X, and Z axes), and some are equipped with an A-axis for tool holder tilting. The workpiece spindle and hob spindle utilize direct-drive motors (such as torque motors or electric spindles) to eliminate transmission backlash and achieve high-speed, high-torque, and high-precision cutting.
High-rigidity structural design: The machine bed is primarily constructed of high-strength cast iron or artificial marble, enhancing thermal stability and vibration resistance. High-precision linear roller guides are used, coupled with closed-loop control, ensuring machining accuracy reaches GB/T10095 standard level 6 or even level 5.
Automation and intelligent functions:
Automatic feeding mechanism: Companies such as Jiangsu Meidi have obtained patents for automatic feeding hobbing machines, significantly improving processing efficiency.
Automatic tool shifting function: Through Y-axis servo control, the hob position is periodically moved to even out tool wear and extend tool life.
Quick tool and fixture change device: Fourth-generation hobbing machines (such as the Gleason GENESIS series) integrate a quick-change system, reducing downtime.
Dry Cutting and Green Machining: New gear hobbing machines support dry cutting. For example, the Chongqing Machine Tool YE3140 is the first large-module dry cutting seven-axis gear hobbing machine in China, reducing coolant pollution and lowering energy consumption.
High-Speed and High-Efficiency Machining Capabilities: Cutting speeds can reach 100–150 m/min or higher. Combined with multi-start hobs and coated tools, productivity is significantly improved. Cutting speed tests on some models have reached 400 m/min.