Cutting Tool Adjustment Sleeve for Backlash-Free Insert Positioning
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Solution Overview
Problem
Existing cutting tools face challenges in achieving high feed accuracy and diameter dimensional accuracy due to unavoidable thread play between the adjusting screw and threaded bore, leading to radial movement or vibration of the cutting insert carrier during machining, which compromises the precision of the cutting tool.
Innovation Solution
A cutting tool with a central adjusting device featuring a threaded sleeve and screw drive for precise position adjustment of the cutting insert carrier, combined with an alignment device that reduces thread play through an elastically deformable wall segment and pressure element, allowing for fine and stable adjustment of the cutting insert carrier relative to the main body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an adjusting screw with a threaded bore is used for position adjustment, then individual position adjustment of the cutting insert carrier is enabled, but thread play between the adjusting screw and threaded bore causes radial movement or vibration during machining
Solution Approach 1:
The patent changes the physical state of the wall segment from rigid to elastically deformable, allowing it to dynamically adapt to cutting forces while maintaining thread engagement. This elasticity enables the connection to remain stable under variable loads without compromising adjustment precision.
Solution Approach 2:
The patent employs a composite structure combining an elastically deformable wall segment with threading, creating a hybrid connection that exhibits both flexibility and mechanical engagement. This composite approach allows the threaded connection to accommodate dynamic forces while preventing radial movement.
2Manufacturing precision
If a compression spring package is used to press the adjusting screw against the pressure pin, then thread play between the front thread flanks is reduced, but thread play between the rear thread flanks persists or is enlarged
Solution Approach 1:
The patent extracts the compression spring package from the adjusting mechanism, removing the source of uneven thread play. By eliminating this external forcing element, the design achieves more uniform thread engagement without the complexity of spring packages or adjustable tensioning mechanisms.
Solution Approach 2:
The elastically deformable wall segment automatically adapts to cutting forces and maintains optimal thread engagement without requiring external adjustment mechanisms. The structure self-regulates the thread contact pressure, eliminating the need for compression springs or other active components.
3Measurement precision
If the cutting insert carrier is made centrifugal-force neutral and free from play, then high feed accuracy is achieved, but the adjusting mechanism becomes complex with multiple components
Solution Approach 1:
The patent merges the alignment function and the support function into a single elastically deformable wall segment with threading. This integrated structure simultaneously provides precise positioning and dynamic stability under cutting forces, eliminating the need for separate alignment and support mechanisms.
Solution Approach 2:
By changing the wall segment from rigid to elastically deformable, the patent achieves centrifugal-force neutrality and play-free operation without complex adjustment mechanisms. The elastic deformation allows the structure to naturally compensate for forces during machining 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
The solution enables precise, reliable position adjustment of the cutting insert carrier, reducing thread play and ensuring high diameter dimensional accuracy even under variable cutting forces, thereby enhancing the cutting tool's stability and precision.
Implementation Method 1
a region of an internal thread of the threaded bushing corresponding to the wall segment is pressed against an external thread of the adjusting screw
Data Source
AI summary
The invention relates to a cutting tool comprising a main part which extends along a longitudinal center axis or rotational axis, at least one cutting insert holder mounted on the main part such that it can be radially adjusted, and an adjusting device for adjusting the position of the cutting insert holder relative to the main part. The adjusting device comprises a threaded sleeve which is non-rotatably but axially movably mounted in the main part and a screw drive driving the threaded sleeve.