Finishing Tool Positioning for Ball Bearing Raceway Groove Offset
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Solution Overview
Problem
The challenge in finish machining of ball bearing rings is the 'groove offset', which refers to the tolerance of the raceway middle with respect to the ring contact side, making it difficult to achieve high geometric precision and surface quality, especially when using finishing tools that require precise positioning.
Innovation Solution
A finishing method and apparatus that utilize a force transducer to detect and analyze force signals during the machining process, allowing for the determination of geometry parameters and automatic adjustment of the finishing tool's position to compensate for groove offsets, ensuring high precision and surface quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional finishing tools are used without force signal analysis, then the machining process is simpler, but the geometric precision and surface quality cannot be optimized
Solution Approach 1:
The patent applies force signal analysis during the finishing process to detect groove offset and other geometric deviations. The measured force signals are fed back to the control system, which automatically adjusts the finishing tool position and parameters to compensate for deviations, thereby achieving high geometric precision through closed-loop control.
Solution Approach 2:
The patent replaces manual measurement and adjustment methods with automated force signal-based detection and control. Instead of relying on mechanical measurement devices or operator skill, the system uses force transducers and electronic control to automatically compensate for groove offset and optimize machining parameters.
2Manufacturing precision
If manual adjustment is used to compensate for groove offset, then the setup time is longer, but the geometric precision can be improved
Solution Approach 1:
The patent performs preliminary force signal measurement during a detection phase before actual machining begins. By analyzing the force signals in advance, the system pre-calculates the necessary compensation values and automatically adjusts the tool position before the finishing process starts, eliminating the need for time-consuming manual adjustments during setup.
Solution Approach 2:
The system automatically detects groove offset through force signal analysis and performs self-adjustment without requiring manual intervention. The control system independently processes force signals, calculates compensation, and adjusts tool positioning, making the setup process autonomous and time-efficient.
3Manufacturing precision
If softer finishing tools are used to adapt to workpiece geometry, then the groove offset can be compensated, but the tool wear increases and productivity decreases
Solution Approach 1:
The patent uses force signal analysis to detect the actual workpiece geometry and groove offset in real-time. Based on these measurements, the control system dynamically adjusts machining parameters such as feed rate, depth of cut, and tool pressure to optimize the finishing process. This allows the use of harder, more durable tools while maintaining high geometric precision through adaptive parameter control.
4Manufacturing precision
If the pivot axis is positioned precisely at the curvature center, then the surface quality is optimal, but the setup complexity increases
Solution Approach 1:
The patent employs force signal-based automatic detection to identify the actual curvature center and groove offset during the machining process. The control system self-adjusts the pivot axis position to the optimal location without requiring complex manual setup procedures, thereby achieving high surface quality through automated positioning rather than complex manual alignment.
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 proposed solution enables the finish machining of ball bearing rings with high geometric precision and surface quality, reducing the need for manual intervention and allowing for the use of harder finishing tools with lower wear, thereby improving workpiece quality and reducing setup time.
Implementation Method 1
a force signal caused by the press-on force is continuously detected at least during a detection time period which partially or completely overlaps the machining time period of the finish machining
Data Source
AI summary
The invention relates to a finishing method for finish machining of a workpiece having at least one raceway for rolling elements that extends around a workpiece axis, the method comprising the following steps: providing a finishing tool which has an abrasive working surface; applying the finishing tool to a workpiece holder, generating spinning of the workpiece about a raceway axis at a rotational frequency; generating an oscillating movement of the tool holder, which is superimposed on the spinning of the workpiece and oscillates at an oscillating frequency; and pressing the finishing tool onto the workpiece surface in a pressing direction with a pressing force so that the abrasive working surface acts on the workpiece in the region of the raceway. The finishing method is characterised by continuous detection of a force signal, which is caused by the pressing force, within a detection time period which partly or completely overlaps a machining time period of the finish machining, and by time-resolved evaluation of the force signal in order to determine at least one geometry parameter which represents (i) a workpiece geometry in the region of the machined raceway and/or (ii) a geometric relationship between the workpiece geometry in the region of the machined raceway and a position of an oscillating apparatus.