Insert Holder Groove Structure for Stable Cutting Insert Positioning
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Solution Overview
Problem
Conventional cutting tools with perpendicular or parallel insert holders experience variations in insert distance from the axis, leading to workpiece load concentration and insert vibrations, reducing cutting stability and accuracy.
Innovation Solution
A cutting tool design featuring a shaft-like insert holder with grooves and angled projecting portions that secure inserts, reducing distance variations and preventing detachment, thereby enhancing stability and accuracy by ensuring consistent insert positioning and load distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If annular members are used to hold inserts with perpendicular or parallel contact surfaces, then the insert holder structure is simple, but variations in insert distance from the axis occur causing load concentration and vibrations
Solution Approach 1:
The contact surfaces between the inserts and the insert holder are designed with curved surfaces instead of perpendicular or parallel flat surfaces. Specifically, the inner circumferential surface of the insert holder and the outer circumferential surface of the inserts are both curved, allowing the inserts to be positioned at a constant distance from the rotation axis regardless of radial clearance, thereby eliminating positioning accuracy issues while maintaining structural simplicity.
2Ease of operation
If clearance is provided in the insert holder to fit inserts, then the inserts can be easily installed, but the distance from the axis to the inserts varies during cutting operations
Solution Approach 1:
Curved contact surfaces are provided both on the insert holder (inner circumferential surface) and on the inserts (outer circumferential surface). This dual curved surface design ensures that even with clearance for easy installation, the inserts automatically position themselves at a constant radial distance from the rotation axis during cutting operations, eliminating insert vibrations and load concentration.
3Ease of manufacture
If the inserts are held with flat contact surfaces, then the manufacturing is simple, but load concentration occurs on some inserts during cutting
Solution Approach 1:
The insert holder is manufactured with a curved inner circumferential surface and the inserts have curved outer circumferential surfaces. This curvature design redistributes the cutting loads evenly across all inserts by ensuring constant radial positioning, preventing load concentration on specific inserts while maintaining manufacturing simplicity through conventional curved surface machining or forming processes.
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 design improves cutting stability and accuracy by minimizing insert vibrations and load concentration, extending insert life through adjustable orientation, and simplifying manufacturing and assembly while reducing the number of components.
Implementation Method 1
The first retaining faces of the first retaining portions make surface-contact with the first projecting faces, while the second retaining faces of the second retaining portions make surface-contact with the second projecting faces. Since the inserts are pressed against the body by means of the angled surfaces...
Data Source
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AI summary
Multiple grooves, which are closed on a first end side and are open on a second end side, are provided on the outer circumferential surface of the body of an insert holder, and said body is also provided with a first protrusion that is at a prescribed distance from the groove bottoms of the grooves and protrudes from the first end side toward the second end side of the grooves. A cover is provided with second protrusions, which, when the cover is installed on the body, are at a prescribed distance from the groove bottoms and protrude toward the first end. A first holding surface of an insert first holding part, which is inserted between a groove bottom and a first protrusion, and a first protrusion surface of the first protrusion make surface contact and said surfaces are sloped so as to approach the groove bottom as the first end is approached. A second holding surface of an insert second holding part, which is inserted between the groove bottom and a second protrusion, and a second protrusion surface of the second protrusion make surface contact and said surface are sloped so as to approach the groove bottom as the second end is approached.