Insert Locking Recesses Prevent Escape Under Centrifugal Force
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Solution Overview
Problem
Existing insert-tool holder assemblies experience deteriorated fastening torque and insert escape due to flat contact surfaces and lack of locking features, especially under centrifugal or centripetal forces, and inefficient coating processes with multiple pins required.
Innovation Solution
The insert features inclined locking recesses on its lower surface and corresponding locking protrusions on the tool holder, along with a center hole for single-pin coating, enhancing fastening torque and preventing escape, while the uneven major edge clearance surface design further secures the insert during high-speed processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If flat contact surfaces are used between insert and tool holder, then manufacturing simplicity is improved, but fastening torque deteriorates allowing insert escape
Solution Approach 1:
The patent applies curvature by replacing the flat contact surface with an inclined clearance surface that forms a continuous slope from the upper surface to the lower surface of the insert body. This inclined surface creates a wedge-shaped interface with the tool holder, generating mechanical locking action through the inclination angle rather than relying on flat surface friction alone.
2Ease of manufacture
If flat major edge clearance surface is used, then manufacturing simplicity is improved, but locking capability deteriorates under centrifugal or centripetal force
Solution Approach 1:
The major edge clearance surface is designed as an inclined plane that slopes continuously from the upper surface to the lower surface, creating a wedge-shaped geometry. This inclination provides mechanical locking by converting radial forces during cutting into axial clamping forces that press the insert against the tool holder, preventing escape under centrifugal or centripetal loads.
3Quantity of substance
If two pins are used for insert coating, then coating coverage is improved, but charge efficiency deteriorates
Solution Approach 1:
The patent merges the functions of multiple fastening holes into a single integrated fastening structure. By using one fastening hole with an inclined clearance surface instead of multiple separate pins, the design reduces the number of components required for coating support while maintaining adequate coating coverage, thereby improving charge efficiency during the coating process.
Data Source
AI summary
A technical object is to provide an insert capable of preventing escaping of the insert from an assembly of the insert and a tool holder. To this purpose, the insert includes an insert body, and a holder fastening portion provided in the insert body to be fastened to the tool holder, in which the holder fastening portion includes one or more fastening holes formed through the insert body from an upper surface to a lower surface, and one or more locking recesses formed by being recessed in a lower surface periphery of the insert body.