Flexible Electronic Gearbox for Synchronized CNC Gear Hobbing
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Solution Overview
Problem
Current CNC machines face challenges in achieving synchronized multi-axis motion control, leading to instability and accuracy issues due to transmission gaps and the inability to meet the stringent requirements for relative motion speeds during machining, particularly for high-grade gears, resulting in the need for imported systems.
Innovation Solution
A method for synchronized multi-axis motion control using a flexible electronic gearbox, which includes a CNC gear hobbing machine with axes A, B, C, X, Y, and Z, employing a grating encoder, microprocessor, and an ARM-DSP-FPGA hardware platform to detect and compensate for tracking errors through a decoupling compensation model, ensuring precise gear machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rigid connection of motor shafts is used to keep speed synchronous, then speed synchronization is improved, but transmission gap causes control accuracy deterioration
Solution Approach 1:
The patent replaces the traditional mechanical rigid connection system with an electronic synchronization system. Instead of physically connecting motor shafts to ensure speed synchronization, the system uses electronic gearboxes and control algorithms to achieve synchronous motion. This substitution eliminates the transmission gap issue while maintaining speed synchronization through digital control rather than mechanical coupling.
Solution Approach 2:
The patent changes the control parameters from mechanical position feedback to electronic position feedback. By using high-resolution encoders and electronic gear ratios, the system can precisely control and synchronize multiple axes without the mechanical transmission errors. The electronic parameter adjustments allow for dynamic compensation of positioning errors while maintaining synchronization.
2Reliability
If speed ring is continuously adjusted to keep speed synchronous, then speed synchronization is improved, but system stability deteriorates
Solution Approach 1:
The patent implements a closed-loop feedback control system using high-resolution encoders on each motor shaft. Instead of continuously adjusting the speed ring mechanically, the system electronically monitors actual positions and speeds, compares them with target values, and makes precise corrections. This feedback mechanism achieves speed synchronization while maintaining system stability through controlled, incremental adjustments rather than continuous mechanical modulation.
3Ease of operation
If interpolation algorithm is used for linkage motion control, then motion coordination is improved, but dynamic accuracy and static accuracy consistency deteriorates
Solution Approach 1:
The patent replaces traditional interpolation algorithms with electronic gearboxes that provide precise, real-time motion coordination. The electronic gearboxes directly enforce the kinematic relationships between axes through electronic control, eliminating the need for complex interpolation calculations. This approach ensures both dynamic and static accuracy consistency by maintaining exact gear ratios throughout the motion range rather than approximating positions through interpolation.
4Manufacturing precision
If imported CNC system is used for high-precision gear machining, then machining precision is improved, but system cost deteriorates
Solution Approach 1:
The patent employs cost-effective electronic components and control algorithms to achieve high-precision gear machining without requiring expensive imported CNC systems. By using domestically available electronic gearboxes, high-resolution encoders, and sophisticated control software, the system attains machining precision comparable to imported systems at a fraction of the cost. The solution focuses on intelligent control rather than expensive hardware.
Data Source
AI summary
According to a machining principle of the CNC gear hobbing machine, a functional relation between a geometric error of a gear and a tracking error of each motion axis of the machine tool is constructed; a machining error mathematical model of tooth profile deviation, tooth pitch deviation and tooth direction deviation at each position control time point is established by tracking errors of each motion axis; a compensation quantity required for a workpiece rotation axis at the next position control time point is calculated by establishing a decoupling compensation model; average absolute values of machining errors and a total compensation quantity of the machining errors under the conditions of not adopting the synchronous control method and adopting the synchronous control method in the total position control time are obtained by calculating machining error values of each position controls time point, and the synchronized multi-axis motion control is completed.