Gear Grinding Spindle Temperature Compensation for Axial Accuracy
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Solution Overview
Problem
Gear grinding machines face temperature-induced axial displacement issues during dressing and grinding, leading to errors in tool geometry and incomplete flanks due to temperature differences between grinding and dressing processes.
Innovation Solution
A gear grinding machine with a temperature sensor attached to the spindle bearing's outer ring to measure temperature and a control device that performs temperature compensation by adjusting the tool spindle's position based on the temperature difference, ensuring accurate axial positioning through the formula (T1-T2)*K=Δy, where T1 is the bearing outer ring temperature, T2 is the reference temperature, and K is the compensation factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If temperature compensation is not implemented, then the gear grinding machine operates without additional complexity, but temperature-induced axial displacement causes errors in dressed grinding tool geometry and incomplete flanks
Solution Approach 1:
The patent replaces mechanical measurement and adjustment methods with a temperature sensing and electronic compensation system. A temperature sensor monitors the bearing outer ring temperature, and the control device calculates axial displacement based on temperature changes, automatically adjusting the tool spindle position through electronic control rather than mechanical measurement and manual adjustment
Solution Approach 2:
The patent implements a feedback loop where the temperature sensor continuously monitors bearing outer ring temperature, the control device calculates the resulting axial displacement, and the system automatically adjusts the tool spindle position to compensate. This closed-loop feedback ensures accurate compensation without requiring complex mechanical measurement systems
2Temperature
If the grinding spindle is cooled down between grinding and dressing, then the spindle temperature decreases, but this temperature difference causes axial displacement of the grinding tool
Solution Approach 1:
The temperature sensor provides continuous feedback on bearing outer ring temperature, allowing the control device to calculate and compensate for axial displacement caused by temperature changes during cooling between grinding and dressing operations
Solution Approach 2:
The system monitors temperature parameter changes of the bearing outer ring and automatically adjusts the axial position parameter of the tool spindle based on the calculated displacement, allowing the spindle to be cooled without compromising positioning accuracy
3Manufacturing precision
If dressing is performed on a single flank with long dressing time, then the dressing process can be completed thoroughly, but temperature-induced axial displacement increases during the extended dressing time
Solution Approach 1:
The continuous temperature monitoring and automatic compensation system maintains accurate axial positioning throughout the extended single flank dressing process, allowing thorough dressing without compromising precision due to temperature-induced displacement over time
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 solution effectively compensates for temperature-induced axial displacements, ensuring reliable and repeatable dressing and grinding by maintaining precise axial positioning of the tool spindle, reducing errors and ensuring complete flanks are ground.
Implementation Method 1
having a temperature sensor, wherein the temperature sensor is assigned to a bearing outer ring of the spindle bearing of the tool spindle and is adapted to measure a bearing outer ring temperature of the bearing outer ring
Implementation Method 2
the control device is adapted to perform a temperature compensation on the basis of a measured bearing outer ring temperature of the bearing outer ring with respect to a reference temperature, wherein a temperature-induced axial displacement of the tool spindle is compensated
Data Source
AI summary
A gear grinding machine includes a spindle arrangement, having a rotationally drivable tool spindle for accommodating a tool, having a spindle bearing for mounting the tool spindle in a housing, having a temperature sensor, wherein the temperature sensor is assigned to a bearing outer ring of the spindle bearing of the tool spindle and is adapted to measure a bearing outer ring temperature of the bearing outer ring, having a control device for controlling a grinding process of a toothing to be ground and/or for controlling a dressing of the tool. The control device is adapted to perform a temperature compensation based on a measured bearing outer ring temperature of the bearing outer ring compared to a reference temperature, wherein a temperature-induced axial displacement of the tool spindle is compensated.