Asymmetric Rotary Cutting Insert for Secure Deep-Hole Drilling
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Solution Overview
Problem
Existing rotary cutting tools with single radially extending cutting-edge portions face challenges in maintaining secure attachment and efficient operation during drilling operations, particularly in deep hole drilling, due to issues with wear and detachment.
Innovation Solution
A rotationally asymmetric cutting insert with a radially extending cutting-edge portion is designed, featuring opposing front and rear surfaces interconnected by a peripheral surface with land edges and rake surfaces, secured to a tool shank with protuberances and an insert receiving slot, allowing for secure attachment and regrinding capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single radially extending cutting-edge portion is used in rotary cutting tools, then drilling capability is achieved, but secure attachment and resistance to detachment during operation deteriorates
Solution Approach 1:
The cutting insert employs rotational asymmetry with a single radially extending cutting-edge portion positioned at a specific angular location, creating an asymmetric mass distribution that generates centrifugal locking force during rotation. This asymmetric design transforms the cutting edge configuration into a reliable attachment mechanism that prevents detachment while maintaining drilling capability.
Solution Approach 2:
The insert utilizes dynamic centrifugal force generated during rotation to enhance attachment security. As the insert rotates at cutting speed, the asymmetric mass distribution creates outward centrifugal force that presses the insert against the tool shank, dynamically securing the attachment during operation rather than relying solely on static mechanical fastening.
2Adaptability or versatility
If cutting insert is made with single radially extending cutting-edge portion, then drilling function is provided, but radial support and stability deteriorates
Solution Approach 1:
The solution transitions from considering only the cutting edge geometry to incorporating the three-dimensional rotational dimension. By designing the insert with asymmetric mass distribution that generates centrifugal force in the radial direction during rotation, the system gains dynamic radial support stability without compromising the drilling function provided by the single cutting edge.
3Reliability
If cutting insert is designed for secure attachment, then detachment risk is reduced, but regrinding capability and tool life extension deteriorates
Solution Approach 1:
The cutting tool is segmented into a reusable tool shank and a replaceable/regrindable cutting insert. The insert can be securely attached during operation and then removed for regrinding or replacement, separating the secure attachment function from the cutting edge regeneration function. This allows the insert to be designed for secure attachment while maintaining regrinding capability through proper geometric design.
Data Source
AI summary
A cutting insert rotatable about an axis, has opposing front and rear surfaces interconnected by an insert peripheral surface, the insert peripheral surface having first and second side surfaces spaced apart by first and second land surfaces. First and second land edges extend along the first and second land surfaces, respectively. A first front edge formed at the intersection of the front surface and the first side surface includes a cutting-edge portion, and a second front edge formed at the intersection of the front surface and the second side surface is devoid of a cutting-edge portion. A cutting profile formed by rotating the cutting-edge portion about the axis is located axially forward of the second front edge. The cutting insert is releasably secured to a tool shank, the cutting insert being located between two protuberances protruding from a forward end portion of the tool shank.