Cutting Tool Shank Adjustment Ring for Runout Correction
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Solution Overview
Problem
Existing cutting tools with radial runout correction capabilities are structurally complex, require dedicated devices, and often suffer from wear due to friction, limiting their applicability and accuracy in machining processes.
Innovation Solution
A cutting tool design featuring a shank with a circumferential groove and an adjustable ring that applies a purely radially directed force through a screw, inducing a bending moment on the shank to correct radial runout, allowing for continuous 360° adjustment without direct friction-induced wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a screw with a frusto-conical bearing surface is used to apply a deflecting force, then runout correction can be achieved, but the bearing surface becomes worn due to friction as it rotates and applies force
Solution Approach 1:
The invention extracts the harmful frictional contact between the screw and the groove by introducing a separate adjustment member that engages with the groove. The screw no longer directly contacts the groove, eliminating the wear problem while maintaining the runout correction function through the adjustment member's engagement with the groove's side walls.
2Manufacturing precision
If dedicated runout correction devices are used, then runout correction capability is achieved, but the device complexity increases and existing cutting tools cannot be applied
Solution Approach 1:
The invention makes the runout correction mechanism universal by designing it to be implemented on existing cutting tools through a standard circumferential groove feature. The adjustment ring with screw and adjustment member can be applied to various cutting tool types (reamers, drills, end mills) without requiring dedicated specialized devices, thereby reducing overall system complexity while maintaining correction capability.
3Manufacturing precision
If adjustment members engage the groove to induce bending moment, then runout correction is achieved, but the adjustment member must be precisely positioned diametrically opposite the threaded bore
Solution Approach 1:
The adjustment member's positioning is simplified by designing it to engage with the side walls of the circumferential groove, which naturally guide its placement. The groove's geometry provides self-aligning features that facilitate correct positioning of the adjustment member diametrically opposite the threaded bore during assembly, reducing manufacturing complexity while ensuring proper functional alignment.
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 provides a simple, effective radial runout correction mechanism that can be applied to existing tools, enhancing machining accuracy and reducing structural complexity and wear, enabling precise alignment of cutting tools in any radial direction.
Implementation Method 1
the screw is rotatable in the threaded through bore to exert a purely radially directed force on the groove, thereby inducing displacement of the adjustment member radially inwardly
Implementation Method 2
the adjustment member exerts non-radially directed forces on the groove, thereby inducing a bending moment on the shank
Data Source
Figure 1~2
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Figure 5~6
AI summary
A cutting tool has a shank (16) with a circumferential groove and an adjustment ring (22) releasably secured to the shank at the groove. The adjustment ring has a threaded through bore in which a screw (24) is screw mounted and engages the groove. The adjustment ring has an adjustment member which engages the groove and which is positioned diametrically opposite the threaded through bore. When the screw is tightened it exert a purely radially directed force on the groove thereby inducing displacement of the adjustment member radially inwardly and the adjustment member exerts non- radially directed forces on the groove, thereby inducing a bending moment on the shank for correction of radial runout.