Grinding Wheel Speed Variation for Barrel Form Profiles
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Solution Overview
Problem
Recent advancements in grinding technologies, particularly the use of CBN wheels, have made it difficult to produce non-parallel sided cylindrical bearing components, such as barrel forms, using multi-plunge and vector grinding methods.
Innovation Solution
A method involving a rotatable grinding wheel that is rotated at varying speeds to distort its shape, allowing for the creation of desired profiles on workpieces by manipulating the wheel's asymmetry and material properties, enabling the grinding of non-parallel shapes like barrel forms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multi-plunge grinding or vector grinding methods are used with CBN wheels, then grinding precision and productivity are improved, but the ability to produce non-parallel sided cylindrical bearing components (barrel forms) is lost
Solution Approach 1:
The grinding wheel's rotational speed is dynamically varied during the grinding operation. The wheel rotates at a first speed during initial grinding and then at a second speed during finishing grinding, causing the wheel to distort in a predetermined manner. This dynamic speed adjustment allows the wheel to produce non-parallel profiles while maintaining the precision benefits of CBN wheels.
Solution Approach 2:
The rotational speed parameter of the grinding wheel is changed between two distinct values (first speed and second speed) during the grinding process. This parameter change causes corresponding changes in wheel distortion, enabling the wheel to adapt its shape to produce non-parallel sided cylindrical bearing components while maintaining high grinding precision.
2Adaptability or versatility
If the grinding wheel is rotated at varying speeds to distort its shape, then the ability to grind complex shapes like barrel forms is improved, but the device complexity and control requirements increase
Solution Approach 1:
The system employs dynamic speed variation of the grinding wheel, transitioning from a first rotational speed to a second rotational speed during the grinding operation. This dynamic adjustment causes the wheel to distort in a predetermined manner, enabling the grinding of complex non-parallel shapes while maintaining manageable control through defined speed transitions.
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 the effective grinding of complex shapes like barrel forms and tapered lobes by predicting and controlling the wheel's distortion, overcoming the limitations of previous methods in producing non-parallel profiles.
Implementation Method 1
the wheel is rotated at a second speed during grinding of the workpiece so that the shape of the wheel is distorted in a predetermined manner during grinding at the second speed relative to its shape during grinding at the first speed
Implementation Method 2
The inherent characteristics may include the physical dimensions, physical shape and material of the grinding wheel, together with its modulus of elasticity
Data Source
AI summary
A method of grinding a workpiece with a grinding wheel is provided wherein the shape of the wheel is distorted in a predetermined manner during grinding by changing the speed of rotation of the wheel. This deformation of the wheel during grinding is employed to impart a desired shape to the surface of the workpiece. A grinding wheel is also provided which is asymmetric in side view to adapt it for use in accordance with the method.