Segmented Oscillating Tool Holder for Ball Screw Finishing
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Solution Overview
Problem
Existing devices for finishing machining of internal workpiece faces, such as ball screw tracks, are limited by the length of the U-shaped tool holder, restricting thread length and maximum oscillation angles, which hinders efficient machining of long threads and precise angle adjustments.
Innovation Solution
A device with an oscillating drive that allows the finishing tool and workpiece holder to move parallel to the rotational axis, combined with pivotability of the finishing tool, enabling independent selection of oscillation angles and compensation for position errors, and a mechanism for easy tool exchange and lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a U-shaped tool holder is used to hold the finishing tool, then the tool can be driven in an oscillating manner, but the thread length that can be machined is limited by the length of the tool holder
Solution Approach 1:
The tool holder is divided into a first tool holder component and a second tool holder component that can move relative to each other along the rotational axis. This segmentation allows the tool holder to accommodate longer threads by extending its effective length through relative movement of the components, while each component maintains a manageable size and structural integrity.
Solution Approach 2:
The second tool holder component is made movable relative to the first component along the rotational axis, transforming the static U-shaped tool holder into a dynamic structure. This dynamic configuration enables the tool holder to adapt its length to match the thread length being machined, thereby removing the fixed length limitation while maintaining structural stability during oscillating motion.
2Length of moving object
If the insertion depth of the finishing tool is increased, then more of the internal face can be machined, but the maximum possible angles of oscillation are limited
Solution Approach 1:
The movable second tool holder component allows the oscillation angle to be independently adjusted without being constrained by the insertion depth. As the component moves along the rotational axis, it changes the effective lever arm and geometry of the oscillating mechanism, enabling the oscillation angle to be optimized for different insertion depths and machining requirements.
3Device complexity
If the finishing tool is fixed on the tool holder, then the structure is simple, but position errors between the workpiece and tool cannot be compensated
Solution Approach 1:
The movable second tool holder component introduces a degree of freedom that allows for dynamic adjustment and compensation of position errors. The component can move along the rotational axis to accommodate variations in workpiece positioning, thereby compensating for position errors without requiring complex active control systems or precision mechanisms.
Data Source
AI summary
Device and method for the finishing machining of an internal face of a workpiece, such as the track of a ball screw, including a workpiece holder and a finishing tool held on a finishing tool holder. A rotary drive is provided, by which the workpiece holder and the finishing tool is rotationally driven relative to one another about a rotational axis. A linear drive is provided, by which the finishing tool held on the finishing tool holder and the workpiece holder is driven in a translatory manner relative to one another along the rotational axis. An oscillating drive is provided, by which the finishing tool held on the finishing tool holder and the workpiece holder is driven in an oscillating manner relative to one another in the direction parallel to the rotational axis and wherein the finishing tool is pivotably held on the finishing tool holder about a pivot axis.