Helical Gear Grinding Wheel Backlash Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional gear grinding methods for high-hardness gears face challenges in controlling machining pressure, leading to surface roughness limitations, grinding burn, and damage to the grinding wheel or work gear due to zero backlash conditions and difficulty in finely controlling machining pressure.
Innovation Solution
A tooth flank machining device with a helical teeth grinding wheel, supported for rotational movement, and a work gear supporting unit, utilizing a position adjusting unit to control the relative position and rotational torque of the grinding wheel to engage the work gear with a gap, allowing for precise control of machining pressure and surface roughness improvement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If zero backlash condition is used to finish opposite tooth flanks simultaneously, then machining efficiency is improved, but machining pressure cannot be controlled leading to grinding burn and damage
Solution Approach 1:
The invention divides the machining process into two separate stages: first machining one tooth flank, then machining the opposite tooth flank. This segmentation allows independent control of machining parameters for each flank, preventing the pressure control issues that arise when both flanks are machined simultaneously under zero backlash conditions.
Solution Approach 2:
The invention introduces dynamic control of backlash by adjusting the position of the grinding wheel relative to the work gear. By controlling the backlash within a specific range (0.01mm to 0.05mm), the system dynamically adapts the engagement conditions to maintain optimal machining pressure, preventing both excessive pressure (grinding burn) and insufficient pressure (poor surface finish).
2Manufacturing precision
If finishing grinding wheel is used to lower surface roughness, then surface quality is improved, but machining pressure cannot be controlled and grinding wheel may be damaged
Solution Approach 1:
The invention changes the backlash parameter from zero (conventional) to a controlled range of 0.01mm to 0.05mm. This parameter change fundamentally alters the engagement characteristics between the finishing grinding wheel and the work gear, enabling precise control of machining pressure. The controlled backlash prevents excessive pressure that would damage the grinding wheel while maintaining sufficient pressure for effective finishing.
3Speed
If zero backlash engagement is used, then cutting speed control is improved, but machining pressure fluctuates causing grinding burn and cracks
Solution Approach 1:
The invention implements feedback control by continuously monitoring and adjusting the backlash between the grinding wheel and work gear during machining. The system maintains backlash within the optimal range of 0.01mm to 0.05mm, providing feedback control that stabilizes machining pressure and prevents the fluctuations that cause grinding burn and cracks, while preserving good cutting speed control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables improved surface roughness of high-hardness gears by controlling machining pressure, reducing the risk of grinding burn and damage, while allowing for efficient machining of both tooth flanks without remounting the work gear or grinding wheel, and downsizing the motor due to lower torque requirements.
Implementation Method 1
a helical teeth grinding wheel engages a work gear with another work tooth flank apart from the work tooth flank abutting on a grinding wheel tooth flank of the helical teeth grinding wheel
Implementation Method 2
a position adjusting unit capable of moving a relative position of the rotational axis of the helical teeth grinding wheel to the rotational axis of the work gear
Implementation Method 3
a rotational torque controlling unit controlling rotational torque of the work gear; adjust the rotational torque within a predetermined range
Data Source
AI summary
A tooth flank machining device includes a helical teeth grinding wheel, a position adjusting unit] capable of moving a relative position of a rotational axis of the helical teeth grinding wheel to a rotational axis of a work gear, and a controlling unit having a relative position controller activating the position adjusting unit to adjust the relative position of the rotational axis of the helical teeth grinding wheel to the rotational axis of the work gear so that the helical teeth grinding wheel engages the work gear with a grinding wheel tooth flank of the helical teeth grinding wheel abutting on only one of work tooth flanks forming a tooth of the work gear, a grinding wheel rotating unit controller activating a grinding wheel rotating unit, and a torque controlling unit controller activating a rotational torque controlling unit to adjust rotational torque within a predetermined range.