Differential Screw Tool Head for Precise Radial Adjustment
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Solution Overview
Problem
Existing expandable tool heads for reamers and milling tools have complex designs with many components, requiring significant manufacturing effort and space, and lack precise fine adjustment capabilities, especially in the micrometer range.
Innovation Solution
The tool head incorporates a differential screw mechanism with a conical adjusting sleeve, featuring internal and external threads of different lead lengths or directions, allowing for precise radial adjustment and compact design by minimizing the number of components and installation space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional adjusting device with conical adjusting sleeve and single-threaded adjusting screw is used, then the tool head can be expanded radially, but the adjustment precision is insufficient and the device requires large installation space
Solution Approach 1:
The patent combines two thread regions with different leads into a single adjusting screw, merging the functions of coarse and fine adjustment into one component. This differential screw mechanism achieves precise radial adjustment without requiring separate adjusting screws or additional installation space, directly resolving the contradiction between adjustment precision and compact size.
Solution Approach 2:
The patent changes the thread lead parameter along the length of the adjusting screw, with the first thread region having a greater lead than the second thread region. This parameter variation enables the differential mechanism to achieve fine adjustment precision while maintaining a compact structure, as the varying lead ratios amplify small rotational movements into precise linear displacements.
2Ease of operation
If multiple individual components are used in the adjusting device, then the adjustment function can be achieved, but the manufacturing complexity increases
Solution Approach 1:
The patent merges multiple adjusting components into a single integrated adjusting screw with two different thread regions. This consolidation maintains the full adjustment functionality while significantly reducing manufacturing complexity by eliminating the need to manufacture, assemble, and align multiple separate components such as multiple adjusting screws, bearing faces, and pull-out aids.
Solution Approach 2:
The adjusting screw serves multiple functions simultaneously: it provides both coarse and fine adjustment through its two thread regions, acts as its own pulling element for demounting, and integrates the bearing function. This multi-functionality reduces the total component count and simplifies manufacturing while preserving all necessary adjustment operations.
3Ease of repair
If a pull-out aid such as threaded sleeve or annular collar is added, then the demounting process is simplified, but the device complexity increases
Solution Approach 1:
The patent combines the adjusting function and the demounting function into a single adjusting screw component. The second thread region with smaller lead not only provides fine adjustment but also serves as the pulling element for demounting the adjusting sleeve. This merging eliminates the need for separate pull-out aids like threaded sleeves or annular collars, reducing component complexity while maintaining ease of demounting.
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 solution enables precise fine adjustment with fewer parts, reduced manufacturing complexity, and a compact design, allowing for efficient radial expansion and easy release of the adjusting device, while maintaining high precision and adaptability.
Implementation Method 1
The adjusting screw is therefore designed in the manner of a differential screw and has two thread regions of different kinds. The first thread region, in the mounted state, is in engagement with an associated threaded bore in the basic body of the tool head. The second thread region of the adjusting screw is in engagement with an internal thread, coordinated with it, of the adjusting sleeve.
Implementation Method 2
the outer face of which interacts with an annular portion of the tool head, so that, overall, a wedge-type mechanism for widening the annular portion is implemented
Data Source
AI summary
A tool head (10) for a rotating tool (2) includes a basic body (8), an annular portion (12) arranged on an end face on the basic body (8) and surrounds a cavity (22), and an adjusting device (18) including an adjusting screw (32) with a shank (34) and an adjusting sleeve (20). The shank (34) having a first shank portion (36) engaging a threaded bore (44) in the basic body (8). The adjusting sleeve (20) is displaceable by the adjusting screw (32) and has a conical outer face (30) that interacts with an inner face (28) of the annular portion (12) in such a way that, when the adjusting screw (32) is being screwed into the threaded bore (44), the annular portion (12) is spread open by the adjusting sleeve (20).