Hollow Workpiece Eccentricity Reduction via Segmented Clamping
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Solution Overview
Problem
Existing methods for reducing eccentricity between the inner and outer surfaces of hollow work pieces in machine tools are cumbersome, requiring extensive measurement and control efforts, leading to slow and error-prone machining processes that compromise surface quality.
Innovation Solution
The method involves producing partial surfaces on the outer surface using chip-removing machining, allowing for a new clamped position that simplifies the machining process by aligning the inner and outer surfaces' axes, enabling precise and rapid reduction of eccentricity without the need for extensive measurement and control corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple measurement data are recorded and the entire hollow work piece is lathed away in regulating manner, then the eccentricity of the inner surface relative to the outer surface is reduced, but the measurement, calculation, and control effort increases significantly and the machining process becomes slow
Solution Approach 1:
The invention divides the outer surface machining into two stages: first producing a partial surface (clamping surface) that is sufficient for new clamping, then machining the remaining outer surface. This segmentation reduces the measurement and control effort by only requiring precise machining of a portion rather than the entire outer surface in the first stage.
Solution Approach 2:
The invention performs preliminary machining to produce a partial surface that serves as a clamping surface before final outer surface machining. This preliminary action creates a reference surface that simplifies subsequent clamping and machining operations, reducing the overall control effort required.
2Manufacturing precision
If multiple measurement data are recorded and the entire hollow work piece is lathed away in regulating manner, then the eccentricity of the inner surface relative to the outer surface is reduced, but the machining process becomes slow
Solution Approach 1:
The machining process is segmented into two independent stages: producing a partial clamping surface, then machining the remaining outer surface. This allows each stage to be optimized separately and reduces total machining time compared to machining the entire surface in one regulating pass.
Solution Approach 2:
Instead of machining the entire outer surface in the first stage, only a partial surface sufficient for clamping purposes is produced. This partial action is sufficient to achieve the clamping objective and enables faster subsequent machining of the remaining surface.
3Productivity
If the number of recorded measurement data is reduced to accelerate the method, then the machining speed increases, but the precision in the machining of the work piece is significantly lost
Solution Approach 1:
The invention segments the measurement and machining process: fewer measurement data are required to produce the partial clamping surface, while the remaining outer surface is machined based on this new clamping position. This segmentation allows reduced measurement effort without sacrificing overall precision.
Solution Approach 2:
The preliminary production of a partial clamping surface serves as a new reference for subsequent machining. This preliminary action with reduced measurement data establishes a reliable clamping position that enables precise final machining without requiring extensive initial measurements.
4Manufacturing precision
If the entire hollow work piece is lathed away in regulating manner, then the eccentricity is reduced, but the control effort and complexity increases
Solution Approach 1:
The control process is segmented into two simpler stages: producing a partial clamping surface with reduced control requirements, then machining the remaining surface with the new clamping position. This segmentation reduces the overall control effort compared to regulating the entire surface in one complex operation.
Solution Approach 2:
The preliminary production of a partial clamping surface simplifies the control requirements for the main machining operation. By establishing a new clamping position first, the subsequent control effort is reduced because the workpiece is already positioned optimally for final machining.
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 allows for high precision and speed in machining, ensuring improved concentricity and surface quality by simplifying the clamping and machining process, reducing operating effort, and maintaining optimal cutting conditions.
Implementation Method 1
record multiple measurement data dependent on the contour of the inner surface of the hollow work piece, for example using ultrasound
Data Source
AI summary
The invention relates a method for reducing the eccentricity of the inner and outer surface (7, 9) of a hollow workpiece (i), for example a hollow shaft, rotatably clamped in machine tool (2), in which in one clamping a plurality of measurement data depending on the contour of the inner surface (7) of the hollow workpiece (i) are recorded, for example with the aid of ultrasound, using the recorded measurement data a desired surface (13) is calculated for at least a part of the outer surface (9), which has a reduced eccentricity with respect to the inner surface (7) and in a further step the rotating workpiece (i) is at least partially machined at the outer surface (9) thereof according to the desired surface (13).