CNC Turning With Variable Entering Angle for Chip Control
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Solution Overview
Problem
Conventional CNC-lathe turning methods face challenges in tool life and chip control, particularly when machining complex shapes like external grooves, due to constant tool orientation and rapid changes in cutting force, leading to interference and vibrations.
Innovation Solution
A turning method that varies the entering angle of the cutting tool during machining, using a tool with a convex nose cutting edge and straight cutting edges, allowing for a non-linear pass and adjusting the surface generating feed rate to reduce interference and enhance chip control and tool life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the entering angle is kept constant during machining, then the turning operation is simple to perform, but tool life decreases and chip control deteriorates
Solution Approach 1:
The patent applies dynamics by making the entering angle variable rather than constant. The turning tool's orientation is dynamically adjusted during the machining process, allowing the entering angle to change continuously or in steps according to the specific machining requirements, thereby improving tool life and chip control without requiring complete process redesign
Solution Approach 2:
The patent implements parameter changes by varying the entering angle during machining. This involves changing the geometric parameter (entering angle) of the cutting tool relative to the workpiece, enabling optimization of cutting conditions throughout the machining cycle to extend tool life and improve chip evacuation
2Ease of manufacture
If a single turning tool is used for complex shapes, then manufacturing cost decreases, but the risk of interference between inactive parts and work piece increases
Solution Approach 1:
The patent uses dynamics to adjust the tool orientation during machining of complex shapes. By dynamically changing the entering angle and tool orientation, inactive parts of the turning tool are positioned to avoid interference with the workpiece, enabling safe use of a single tool for complex geometries
Solution Approach 2:
The patent applies local quality by optimizing the tool orientation and entering angle for specific local conditions during machining. Different sections of the complex shape receive customized cutting parameters, allowing a single tool to effectively machine varied geometries without interference
3Productivity
If rapid changes in cutting depth are made, then productivity increases, but vibrations increase and tool life decreases
Solution Approach 1:
The patent applies dynamics by continuously or incrementally adjusting the entering angle during machining. This dynamic adjustment allows the system to adapt to changing cutting conditions, maintaining stability even when productivity is increased through faster machining rates
Solution Approach 2:
The patent implements parameter changes by varying the entering angle in response to machining conditions. This parameter adjustment helps maintain stable cutting forces and reduces vibrations, enabling higher productivity without compromising tool life or surface quality
Data Source
AI summary
A turning method for a computerized numerical control lathe includes providing a turning tool having a cutting portion, the cutting portion including a first nose portion, the first nose portion including a first cutting edge, a second cutting edge, and a convex nose cutting edge connecting the first and second cutting edges, wherein the first and second cutting edges are straight or substantially straight in a top view. The method further includes providing a metal work piece, rotating the metal work piece around a work piece rotational axis, and making a first pass where the first cutting edge is active and the second cutting edge is inactive. A first machined surface is generated by the convex nose cutting edge, and during at least a portion of the first pass, an entering angle and an angle, which the first cutting edge forms with the work piece rotational axis, simultaneously varies.