Parting Blade Insert Seat Layout for Long-Overhang Stability
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Solution Overview
Problem
Existing parting blades and tool holders face challenges in maintaining stability and chip evacuation during long overhang and high feed rate applications, particularly in machining operations with large depths of cut, due to bending and vibrations, and inefficiencies in coolant distribution and insert seat design.
Innovation Solution
The development of an elongated parting blade with an insert seat configuration featuring non-parallel lower and rear seat abutment surfaces, oblique blade orientation, and a tool holder design with a reinforcement portion to enhance structural strength and coolant distribution, allowing for improved chip evacuation and stability at high feed rates and large depths of cut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the parting blade is made longer for large depth of cut applications, then the depth of cut capability is improved, but bending and vibrations increase
Solution Approach 1:
The insert seat is positioned asymmetrically closer to one longitudinal edge of the blade, creating an optimized leverage arrangement that reduces bending moments and vibrations while maintaining long blade length for large depth of cut capability
Solution Approach 2:
The cutting insert is oriented with its rake surface perpendicular to the blade elongation direction, changing the dimensional relationship between cutting forces and blade structure to improve stability in long overhang applications
2Stability of the object's composition
If the insert seat is configured with non-parallel abutment surfaces, then cutting force distribution is improved, but manufacturing complexity increases
Solution Approach 1:
The insert seat incorporates non-parallel lower and rear abutment surfaces that asymmetrically distribute cutting forces, improving blade stability and reducing vibrations during high feed rate operations
Solution Approach 2:
Specific regions of the insert seat are given different geometric properties (non-parallel surfaces at critical force-bearing locations) to optimize cutting force distribution while keeping other areas simpler for manufacturing
3Temperature
If coolant outlets are positioned closer to the cutting insert, then cooling effectiveness is improved, but chip evacuation becomes more difficult
Solution Approach 1:
Coolant outlets are positioned above the rake surface of the cutting insert rather than below it, changing the spatial dimension of coolant delivery to simultaneously achieve effective cooling and maintain clear chip evacuation pathways
Solution Approach 2:
Coolant delivery is localized to specific areas above the rake surface where heat generation is most intense, providing targeted cooling without interfering with chip flow paths
4Volume of moving object
If the blade thickness is reduced for compact tool holder configuration, then tool holder compactness is improved, but blade strength decreases
Solution Approach 1:
The blade is constructed from high-performance composite materials that provide exceptional strength-to-weight ratio, enabling reduced blade thickness and compact tool holder configuration while maintaining adequate strength for large depth of cut applications
Solution Approach 2:
The blade incorporates optimized material distribution and geometric features at critical locations to maintain strength despite overall thickness reduction, allowing compact tool holder design
Data Source
AI summary
A tool holder includes a tool shank and a tool head connected to the tool shank. The tool head has a rear surface. An insert seat or a blade pocket is partially formed on both the tool head and the tool shank, and extends rearwardly of the tool head's rear surface. Adjacent to at least a portion of a shank side surface there is a reinforcement portion connecting the shank side surface and the tool head.