Hole Machining Insert with Integrated Guides for Stable Small Diameters
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Solution Overview
Problem
Existing cutting tools face challenges in reducing diameter while maintaining strength and achieving stable cutting due to multiple components and uneven load distribution on fastening parts.
Innovation Solution
A cutting insert design with two guide parts in sliding contact with the machined hole and rearward-facing abutment surfaces on both front and rear sides, reducing the need for guide pads and distributing cutting forces more evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple components (guide pads mounted with screws) are used to achieve stable cutting, then cutting stability is improved, but the tool diameter increases and component thickness is reduced
Solution Approach 1:
The guide parts are integrated directly into the cutting insert structure, merging the guide function with the cutting insert itself. This eliminates the need for separate guide pads and their mounting screws, reducing component count while maintaining the guiding and stabilizing function during machining.
Solution Approach 2:
The cutting insert is designed to perform multiple functions: cutting (via cutting edges), guiding (via guide parts in sliding contact), and positioning (via abutment surfaces). This multi-functionality consolidates what previously required separate components into a single integrated unit.
2Device complexity
If multiple components are accommodated in limited space, then tool diameter is reduced, but the thickness of cutting insert and body is insufficient, lowering strength
Solution Approach 1:
By integrating the guide parts into the cutting insert, the overall tool structure becomes more compact. The eliminated guide pads and mounting hardware free up space, allowing for increased thickness of the cutting insert and body while maintaining a reduced tool diameter.
3Device complexity
If abutment surface is only on rear side of fastening part, then structure is simple, but screw receives large load and cutting stability is compromised
Solution Approach 1:
The abutment surface configuration is segmented into multiple locations: front side abutment surfaces and rear side abutment surfaces. This segmentation distributes the cutting forces across multiple contact points, preventing excessive load concentration on the screw while maintaining structural simplicity.
4Force
If abutment surfaces are provided on both front and rear sides, then load on fastening part is reduced and positioning is improved, but insert structure becomes more complex
Solution Approach 1:
The abutment surfaces are merged into the overall insert geometry as integral features rather than separate components. This integration achieves improved load distribution and positioning functionality without adding discrete parts, thereby minimizing structural complexity.
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 design allows for a smaller tool diameter with sufficient strength and stable cutting performance by reducing component count and load on fastening parts, enhancing positioning and stability.
Implementation Method 1
at least two guide parts that are in sliding contact with an inner surface of a machined hole of the workpiece
Data Source
AI summary
The present disclosure provides a cutting insert mounted to a body when hole machining is performed on a workpiece, the cutting insert comprising: a cutting edge that cuts the workpiece; at least two guide parts that are in sliding contact with an inner surface of a machined hole of the workpiece that has been formed by hole machining; and a through hole for fixing the cutting insert to the body, wherein a front abutment surface and a rear abutment surface, that each face rearward, are provided on the front side and the rear side, respectively, with respect to the through hole.