Rotating Cutting Insert Asymmetry for Milling Force Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Rotating-cutting-edge-type milling tools face issues with deformation, wear, and damage of the rotary support body due to cutting edge forces, particularly during heavy cutting operations with hard-to-cut materials, and struggle to maintain stable rotation of the cutting insert around the insert axial line.
Innovation Solution
The tool design features a cutting insert with a discoid shape and specific angular orientations of its cutting edge, where the insert axial line is inclined in parallel with the resultant cutting force, reducing pressure on the rotary support body and enhancing stable rotation by distributing the force effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a cutting insert is mounted on an insert attachment seat and rotated around an insert axial line during heavy cutting operations, then the cutting edge can cut into hard-to-cut materials, but deformation, wear, and damage of the rotary support body occur due to cutting edge forces
Solution Approach 1:
The cutting insert is designed with an asymmetric geometry where the insert axial line is inclined relative to the tool axial line. Specifically, the cutting insert has a discoid shape with front and rear surfaces that are not symmetric with respect to the tool rotation axis. This asymmetric configuration allows the cutting edge to engage the work material at an optimized angle while directing cutting forces away from the rotary support body, thereby maintaining cutting effectiveness while reducing mechanical stress on the rotation mechanism.
Solution Approach 2:
The patent optimizes specific geometric parameters of the cutting insert, including the inclination angle of the insert axial line relative to the tool axial line (set within specific ranges to balance cutting performance and force distribution), the radius of the cutting edge, and the thickness distribution of the discoid insert. By carefully controlling these parameters, the cutting insert achieves stable rotation while minimizing deformation and wear of the rotary support body during heavy cutting operations.
2Duration of action of moving object
If the cutting insert is rotated around the insert axial line in a driven manner using cutting edge force, then partial sharpness decrease and cutting edge loss are prevented, but stable rotation around the insert axial line becomes difficult to maintain
Solution Approach 1:
The asymmetric design of the cutting insert, with its inclined insert axial line and non-symmetric front and rear surfaces, creates a natural mechanical advantage that facilitates smooth rotation. The geometry is specifically configured so that the cutting edge engages the material in a way that generates rotational moment while the rear surface maintains stable contact with the insert attachment seat, ensuring consistent rotation without jamming or instability.
Solution Approach 2:
The patent specifies optimal parameter ranges for the cutting insert geometry, including the inclination angle of the insert axial line (optimized to balance rotation facilitation and force distribution), the radius and curvature of the cutting edge (optimized for continuous engagement without excessive stress), and the surface finish and contour of the rear surface (optimized for stable seating and rotation). These parameter optimizations ensure that the cutting insert rotates smoothly and stably while maintaining cutting edge sharpness over extended periods.
Data Source
AI summary
A virtual plane obtained by a locus when a tangent line, which passes through a tool distal end edge, of a virtual circle formed when a tool distal end edge of a cutting edge is rotated in a tool circumferential direction is moved parallel to a tool axial line is a reference plane, an angle (ARt) at which a cross line of the reference plane and the cutting edge virtual plane, is inclined with respect to the tool axial line projected onto the reference plane, is in a range of −30 degrees to −60 degrees, an angle (RR) at which a cutting edge tangent line which passes through the tool distal end edge and extends outward in a tool radial direction, is inclined with respect to a predetermined tool radial direction, which passes through the tool distal end edge, is in a range of −30 degrees to −75 degrees.