Replaceable Cutting Tool Head Mount With Circular Hole Clearance
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Solution Overview
Problem
Existing head replaceable cutting tools face challenges in machining costs and shank deformation due to complex non-circular hole configurations and clearance portions, which complicate tool exchange and attachment processes.
Innovation Solution
A head replaceable cutting tool design featuring a circular hole portion with radial inward clearance portions on the projection surface, allowing for single-step drilling and maintaining material thickness, reducing machining steps and deformation risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the hole portion is shaped in a non-circular shape to form a clearance portion, then the clearance for head attachment/detachment is improved, but the machining complexity and cost increase due to requiring multiple machining steps
Solution Approach 1:
The clearance portion is segmented from the hole portion by positioning it in the projection portion rather than the hole portion itself. This allows the hole portion to remain a simple circular shape while the clearance is formed as a separate feature in the projection portion through a different machining approach
Solution Approach 2:
The clearance portion is extracted from the hole portion and relocated to the projection portion. This separation allows the hole portion to maintain its simple circular geometry for easy machining while the clearance function is achieved through a different location and method
2Ease of operation
If the hole portion is shaped in a non-circular shape to form a clearance portion, then the clearance for head attachment/detachment is improved, but the machining time increases due to requiring multiple machining steps
Solution Approach 1:
The projection portion is pre-formed with a circular cross-section matching the hole portion, and the clearance portion is then formed by removing material from the projection portion's outer circumference surface. This preliminary preparation allows for more efficient subsequent machining compared to creating the entire non-circular shape in multiple steps
3Ease of operation
If the clearance portion is provided in the hole portion of the shank, then the clearance for head attachment/detachment is improved, but the shank thickness is reduced causing deformation under external pressure
Solution Approach 1:
The clearance portion is extracted from the hole portion and relocated to the projection portion. This relocation preserves the full thickness of the shank's hole portion while achieving the necessary clearance function in the projection portion, thereby maintaining shank strength
Solution Approach 2:
The projection portion serves as an intermediary element that provides the clearance function without compromising the structural integrity of the shank. By placing the clearance in the projection portion rather than the hole portion, the shank's load-bearing capacity is preserved
Data Source
AI summary
A head replaceable cutting tool having a structure that can limit a machining cost when a clearance portion is formed in a portion at which a head is attached and detached, and also limit deformation of a shank is provided. The head replaceable cutting tool includes: a projection portion or a hole portion for attachment and detachment disposed in a head; a shank to which the head is attachable; a hole portion, to which the projection portion is removably attachable along a central axis, or a projection portion disposed in an end portion of the shank; a fastening member that presses the projection portion toward an inner circumference surface of the hole portion; and a fastened portion disposed in the shank to fasten the fastening member. The hole portion has a transverse cross-sectional shape that is a substantially circular shape having a curvature radius R1, and the projection portion has a transverse cross-sectional shape including a contact portion at which an outer circumference surface of the projection portion is in contact with the inner circumference surface of the hole portion and a clearance portion that is formed in a part of the outer circumference surface so as to deviate radially inward from a virtual circle corresponding to the inner circumference surface and does not come into contact with the inner circumference surface.