Cutting Tool Shank Recess for Long Insert Clearance
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Solution Overview
Problem
Conventional head replaceable type cutting tools face challenges in achieving better cutting performance when using cutting inserts with longer total chip lengths, as they require increasing the projection amount of the head from the shank, which leads to increased deflection of the head and moments on the fastening mechanism.
Innovation Solution
The shank of the cutting tool features a fastening mechanism at its leading end and a recessed part to accommodate part of the cutting insert, preventing interference and allowing the head to be attached without increasing the projection amount from the shank.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the projection amount of the head from the shank is increased to accommodate longer cutting inserts, then the cutting insert length is improved, but the head deflection and moment on the fastening mechanism increase
Solution Approach 1:
The recessed part is formed on the lateral surface of the shank, utilizing the lateral dimension to accommodate the cutting insert. This allows the insert to be housed in the recessed part without increasing the longitudinal projection amount of the head, thereby maintaining the distance between the cutting point and fastening mechanism while accommodating longer inserts.
Solution Approach 2:
The cutting insert is nested within the recessed part of the shank. The recessed part provides a cavity that houses the cutting insert, allowing the insert to be contained within the shank structure rather than projecting outward, thus avoiding interference with the fastening mechanism.
2Object-generated harmful factors
If the projection amount of the head from the shank is increased to avoid interference between the fastening mechanism and cutting insert, then the interference is avoided, but the distance between the cutting point and fastening mechanism increases
Solution Approach 1:
Instead of increasing the longitudinal projection to avoid interference, the recessed part utilizes the lateral dimension of the shank. The cutting insert is accommodated in this lateral recess, allowing the fastening mechanism to remain in its original position without interference, while maintaining a short distance between the cutting point and fastening mechanism.
Solution Approach 2:
The recessed part creates a negative space or cavity that mirrors the shape and size of the cutting insert. This copied geometry allows the insert to fit precisely within the recessed part, accommodating the insert without requiring additional longitudinal space.
3Device complexity
If only the shank contacts the blade rest with the fastening mechanism accepting all forces, then the structure is simplified, but the moment on the fastening mechanism increases with longer inserts
Solution Approach 1:
The recessed part is formed on the lateral surface of the shank, utilizing the lateral dimension to house the cutting insert. This configuration allows the insert to be accommodated without increasing the longitudinal projection, thereby maintaining the original force distribution structure while reducing the moment on the fastening mechanism.
Data Source
AI summary
The present invention can realize better cutting performance while suppressing an influence of, for instance, deflection of a head and an increase in a moment acting on a fastening mechanism even when a cutting insert of a long total length is used. A shank of a head replaceable type cutting tool includes: a fastening mechanism that is formed at a leading end part in a longitudinal direction of the shank, and attaches a head; and a recessed part that is formed at the leading end part so as to accommodate a part of a cutting insert held by the head and avoid an interference with the cutting insert. The recessed part may be provided to accommodate a non-use part of the cutting insert held by the head in a state where the head is attached to the leading end part, and avoid an interference with the cutting insert.