Worm Gear Grinding With Variable Shift Ratio for Tool Wear Control
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Solution Overview
Problem
Existing grinding machines using worm grinding wheels face inefficiencies due to rapid tool wear, leading to reduced workpiece machining capacity and inconsistent precision, particularly in the grinding of gear wheels, where conventional shift strategies fail to optimize the use of abrasive grains and prevent thermal damage.
Innovation Solution
A controller and method for a grinding machine that dynamically adjusts the ratio between shifting and axially-parallel relative movements of the worm grinding wheel based on engagement density, allowing for variable ratios before, during, or after dressing procedures, ensuring consistent precision and extended tool life by adapting the grinding strategy as the worm grinding wheel's diameter decreases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional constant ratio shift strategies are used, then the grinding process is simple to control, but the tool wears out rapidly and machining capacity is reduced
Solution Approach 1:
The patent applies dynamics by transitioning from a constant shift ratio to a variable shift ratio that changes based on the worm grinding wheel diameter. The shift ratio is dynamically adjusted according to the formula s/x = f(d), where s is the shift amount, x is the stroke amount, and d is the wheel diameter. This dynamic adjustment optimizes the utilization of abrasive grains throughout the tool's lifecycle, extending tool life while maintaining high machining capacity.
Solution Approach 2:
The patent implements parameter changes by modifying the shift ratio parameter based on the grinding wheel diameter. As the wheel diameter decreases during use, the shift ratio is adjusted to maintain optimal engagement density. This parameter adaptation ensures consistent grinding performance and prevents thermal damage, thereby extending the effective duration of tool action while maximizing productivity.
2Manufacturing precision
If continuous shifting is performed to prevent thermal damage, then surface quality is maintained, but the complexity of controlling multiple coordinated movements increases
Solution Approach 1:
The patent simplifies control by changing the shift ratio parameter based on wheel diameter rather than implementing complex continuous shifting protocols. The variable ratio approach maintains optimal engagement density and prevents thermal damage through parameter adaptation, achieving high surface quality without requiring complex coordinated movement control systems.
3Productivity
If the worm grinding wheel is divided into different regions for roughing and finishing, then machining efficiency is improved, but the difficulty of detecting and measuring the optimal division points increases
Solution Approach 1:
The patent eliminates the need for manual region identification by implementing automatic parameter changes based on wheel diameter. The system continuously adapts the shift ratio according to the current wheel diameter, effectively transitioning between roughing and finishing modes without requiring detection or measurement of specific region boundaries. This approach maintains high machining efficiency while eliminating the complexity of region identification.
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
This approach enhances the precision and efficiency of gear wheel grinding, allowing for a higher number of workpieces to be machined while maintaining surface quality, as the engagement density is kept constant or approximately constant, thereby extending the tool's lifespan and improving overall machining capacity.
Implementation Method 1
a grinding tool (2) in the form of a worm grinding wheel... which can be rotationally driven about a tool axis of rotation B... The worm grinding wheel (2) executes grinding movements in relation to the gear wheel workpiece W1 during the grinding
Data Source
AI summary
Method for the grinding of a gear wheel workpiece using a dressable worm grinding wheel, wherein the worm grinding wheel is rotationally driven about a tool axis of rotation and the gear wheel workpiece is rotationally driven about a workpiece axis of rotation, and relative movements are executed between the worm grinding wheel and gear wheel workpiece, and wherein after the execution of a dressing procedure of the worm grinding wheel, which is carried out by means of a rotationally-drivable dressing unit, the following steps are carried out:executing a relative shift movement between the worm grinding wheel and gear wheel workpiece parallel to the tool axis of rotation,executing an axially-parallel relative movement between the worm grinding wheel and gear wheel workpiece in parallel or diagonally to the workpiece axis of rotation,wherein a ratio between the shift movement and axially-parallel relative movement is specified, which is variable.