Threaded Grinding Wheel NC Dressing for Helical Gear Bias
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Solution Overview
Problem
Current gear grinding machines face difficulties in modifying the bias tooth flank of helical gears due to the complexity of controlling the wheel pressure angle of threaded grinding wheels, which is essential for reducing gear noises and vibrations.
Innovation Solution
A gear grinding machine equipped with a rotary dressing device and an NC control system that progressively changes the wheel pressure angle of the threaded grinding wheel along a spiral path, allowing for continuous modification of the wheel pressure angle without requiring manual adjustment of the dressing tool's position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual adjustment of the dressing tool position is used to modify the wheel pressure angle, then the wheel pressure angle can be changed, but the device complexity and difficulty of operation increase
Solution Approach 1:
The system automatically controls the threaded grinding wheel's position and rotation angle through NC control, eliminating the need for manual adjustment of the dressing tool. The threaded grinding wheel itself serves to automatically define the wheel pressure angle through its thread geometry and controlled positioning, making the system self-regulating without external manual intervention.
Solution Approach 2:
The manual mechanical adjustment mechanism for the dressing tool is replaced with an automated NC control system that precisely positions the threaded grinding wheel. This substitution eliminates complex manual positioning mechanisms while achieving more precise and repeatable wheel pressure angle modification through electronic control of the grinding wheel's position and orientation.
2Object-affected harmful factors
If the wheel pressure angle is modified to reduce gear noises, then gear quality improves, but the control complexity of the grinding machine increases
Solution Approach 1:
The wheel pressure angle is modified by changing the positioning parameters and rotation angle of the threaded grinding wheel during the dressing process. By precisely controlling these geometric parameters through NC systems, the wheel pressure angle is optimized to reduce gear noises and vibrations, achieving improved gear quality through parameter optimization rather than mechanical complexity.
3Manufacturing precision
If the threaded grinding wheel position is precisely controlled to modify wheel pressure angle, then manufacturing precision improves, but the ease of operation decreases
Solution Approach 1:
The NC control system automatically manages the complex positioning and rotation of the threaded grinding wheel without requiring operator intervention. The system self-regulates the wheel's position in the Y-direction and its rotation angle around the X-axis, eliminating the need for operators to manually coordinate multiple adjustment mechanisms while maintaining high positioning precision.
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
Enables optimal bias tooth flank modification of helical gears by continuously changing the wheel pressure angle, effectively reducing gear noises and vibrations through precise control of the threaded grinding wheel's position and rotation during the grinding process.
Implementation Method 1
a threaded grinding wheel having a thread spirally formed on an outer peripheral surface thereof
Implementation Method 2
a rotary dressing device having a disk-shaped dressing tool, and arranged such that when the dressing tool is set at the work grinding position, the dressing tool contacts flanks of the thread of the threaded grinding wheel, while being rotationally driven, to perform dressing
Data Source
AI summary
A gear grinding machine, a method for dressing a threaded grinding wheel, and a method for grinding a work are disclosed. A dressing tool is rotated in a vertical plane, with its position being fixed. The position of a threaded grinding wheel is NC-controlled, whereby the dressing tool is brought into contact with the starting point of the thread of the threaded grinding wheel at a somewhat lower surface of the circumferential surface of the threaded grinding wheel and, in accordance with the rotation of the threaded grinding wheel, the position of contact of the dressing tool with the threaded grinding wheel is moved along the circumferential surface of the threaded grinding wheel.