Cutting Tool Body Recess Geometry for Insert Retention and Rigidity
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Solution Overview
Problem
Cutting tools, inserts, and bodies require improved rigidity to enhance performance and durability during machining operations.
Innovation Solution
The cutting tool body, insert, and tool configurations feature a recess design that extends towards the central axis, and side surfaces with inclined portions to increase cross-sectional area, thereby enhancing rigidity. The recess depth may decrease towards the inside of the tool body, and the inclined angles of the side surfaces are strategically chosen to optimize rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the recess is made deeper to hold the cutting insert securely, then the retention of the cutting insert is improved, but the rigidity of the tool body deteriorates
Solution Approach 1:
The recess extends primarily in the axial direction (parallel to central axis) rather than deeply in the radial direction, changing the dimensional orientation of the recess. This allows sufficient insert retention through axial engagement while preserving radial rigidity of the tool body, resolving the contradiction between secure insert holding and maintaining structural stiffness.
Solution Approach 2:
The recess has an asymmetric configuration where its length in the direction parallel to the central axis is made significantly longer (equal to or longer than three times) than its depth in the direction perpendicular to the seating surface. This asymmetric proportioning optimizes both insert retention and tool body rigidity by distributing the structural compromise asymmetrically.
2Strength
If the cross-sectional area of the insert is increased to improve rigidity, then the rigidity of the insert is improved, but the complexity of the side surface geometry increases
Solution Approach 1:
The side surface is segmented into multiple inclined portions (first, second, and optionally third side surface portions) with different inclination angles. This segmentation allows the complex geometry to be broken down into simpler, manufacturable facets while achieving the desired increased cross-sectional area and rigidity.
Solution Approach 2:
Different portions of the side surface have different inclination angles optimized for their specific functions: the first portion provides primary structural support, the second portion optimizes for rigidity, and the third portion (if present) facilitates chip discharge. This local optimization of geometric properties achieves overall rigidity improvement without uniform complexity throughout.
Data Source
AI summary
The first seating surface is contiguous to each of the front end surface and the outer circumferential surface. The second seating surface is contiguous to the front end surface. The cutting tool body is provided with a recess contiguous to each of the first seating surface, the second seating surface, and the front end surface. When the front end surface is viewed in a direction from the front end surface toward the rear end surface, a length of the recess in a direction perpendicular to a straight line parallel to the central axis and extending along the first seating surface is equal to or longer than three times as long as a length of the recess in a direction perpendicular to the first seating surface and passing through a contact point of the second seating surface, the recess, and the front end surface.