Stepped Shaft Machining via Punctiform Axial Stop
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Solution Overview
Problem
Existing methods for machining stepped shafts, such as grinding with centering bores, result in low productivity and large production tolerances due to shaft deformations and bracing issues.
Innovation Solution
A method and device utilizing punctiform contact for axial guidance during machining, which includes a workpiece rest with a grinding disk and control disk, and an axial stop arrangement with a contact adapter for punctiform contact with the shaft's end surface, minimizing axial run-out and angular errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If centering bores are used for grinding stepped shafts, then the shaft can be properly positioned and supported, but productivity is low and production tolerances are large due to shaft bracing and deformations
Solution Approach 1:
The invention removes the centering bores from the shaft design and replaces them with an external axial stop arrangement on the workpiece rest. This extraction eliminates the need for preparatory centering hole machining and avoids the bracing and deformation issues associated with internal centering bores, thereby improving both productivity and manufacturing precision
Solution Approach 2:
The invention introduces an intermediary axial stop arrangement with a punctiform contact surface that mediates between the workpiece rest and the shaft end surface. This intermediary component provides accurate axial positioning without requiring centering bores, resolving the contradiction between productivity and manufacturing precision by enabling direct grinding of shafts without preparatory operations
2Manufacturing precision
If axial guidance is provided through a stop part with larger contact surface, then the shaft is stable, but axial run-out and angular errors cause axially oscillating shaft movements that increase production tolerances
Solution Approach 1:
The invention applies local quality by creating a punctiform (point-like) contact surface on the axial stop arrangement rather than a distributed contact surface. This concentrated local contact minimizes the transmission of axial run-out and angular errors to the shaft, reducing axially oscillating movements and improving production tolerances while maintaining sufficient guidance stability
Solution Approach 2:
The invention inverts the conventional approach to axial guidance. Instead of using a large contact surface that provides stability but transmits errors, it uses a minimal punctiform contact surface that reduces error transmission. The movable guidance feature further inverts the traditional fixed stop concept, allowing the stop to adapt to shaft variations while maintaining 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
This approach significantly enhances production accuracy and productivity by reducing the impact of axial run-out and angular errors, leading to improved machining precision and tolerance in stepped shafts.
Implementation Method 1
grinding that region (2A, 2B, 2C) of the shaft (2) which is to be machined
Data Source
AI summary
The invention relates to a device (1) for machining a stepped shaft (2), having a workpiece rest (6); having a disk arrangement (3) which has a grinding disk (4) and a control disk (5); and having an axial stop arrangement (7), wherein the axial stop arrangement (7) has a contact adapter (8) which can be temporarily placed in contact with an end surface portion (9) of the shaft (2) and which has a punctiform contact surface (10) for contact against a stop part (11) of the stop arrangement (7).