Flat-Sided Clip Groove Cutting Bit for Non-Rotation Retention
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Solution Overview
Problem
Existing non-rotating cutting tools face challenges such as axial movement and rotation prevention, difficulty in replacement, uneven wear, and lack of interchangeability with rotating tools, particularly for PCD tips.
Innovation Solution
A cutting tool assembly with a cylindrical shank featuring a clip groove having a flat, convex, or concave surface that engages with internal radial tabs in a retainer sleeve to inhibit axial movement and rotation, allowing for indexable and interchangeable use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a non-rotating cutting tool design is used to prevent rotation and extend tool lifespan, then tool durability is improved, but the tool becomes difficult to replace and index
Solution Approach 1:
The cutting tool is divided into separable components: a cutting bit with cylindrical shank, a retainer sleeve, and a tool holder. The cutting bit can be independently removed and replaced by detaching the retainer sleeve, enabling easy maintenance and indexing of the cutting element without replacing the entire tool assembly.
Solution Approach 2:
The retainer sleeve incorporates a split design that allows it to be dynamically opened and closed. When the split is opened, the cutting bit can be easily inserted or removed; when closed, it securely retains the cutting bit. This dynamic mechanism enables quick replacement while maintaining secure retention during operation.
2Stability of the object's composition
If a non-rotating design with tapered press fit or screw is used to prevent rotation, then rotation prevention is achieved, but the device complexity increases
Solution Approach 1:
The clip groove on the cylindrical shank features an asymmetric flat-sided design rather than a symmetric circular groove. This asymmetry creates a unique engagement geometry with the retainer sleeve's retaining elements, preventing rotation of the cutting bit within the sleeve while maintaining a simple cylindrical overall shape that is easy to manufacture.
3Duration of action of moving object
If a non-rotating cutting tool is used, then tool lifespan is extended, but interchangeability with rotating tools is lost
Solution Approach 1:
The cutting tool assembly is designed with a universal interface: the cylindrical shank with clip groove and the corresponding retainer sleeve configuration can accommodate both rotating and non-rotating cutting bits. The same tool holder and retainer sleeve assembly can be used for different cutting applications, allowing interchangeability between rotating and non-rotating tool configurations while maintaining extended lifespan benefits.
Data Source
AI summary
A cutting tool includes a cutting bit having a cutting element and a cylindrical shank located below said cutting element and wherein said cylindrical shank has a clip groove having at least one surface that is at least one flat side, at least one convex surface, or at least one concave surface. The surface of the clip groove of the cylindrical shank biases against at least one of an internal radial tab of a retainer sleeve to inhibit axial movement and to inhibit rotation of the cylindrical shank of the cutting tool.