CNC Turning Tool Edge Switching Without Tool Indexing
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Solution Overview
Problem
Conventional CNC-lathe turning methods require significant downtime for indexing between different turning tools, which hampers efficient machining of complex shapes and increases the number of tools needed.
Innovation Solution
A turning method utilizing a single turning tool with a coupling portion and two cutting elements, where the tool is moved in specific directions to alternate the active cutting edges without rotating around the coupling axis, allowing for efficient machining of complex shapes with reduced downtime and tool count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple turning tools are used to machine complex shapes, then the machining capability is improved, but the downtime for indexing between tools increases
Solution Approach 1:
The patent combines multiple cutting elements (first and second cutting elements with different geometries) onto a single turning tool body. This merging allows the tool to perform multiple machining operations without requiring indexing to different tools, thereby eliminating downtime while maintaining the ability to machine complex shapes with varying requirements
Solution Approach 2:
The single turning tool is designed with multi-functionality by incorporating multiple cutting elements that can machine different features. The tool body universally supports various cutting elements with different geometries, enabling one tool to replace multiple specialized tools and eliminate indexing time
2Adaptability or versatility
If multiple turning tools are used to machine complex shapes, then the machining capability is improved, but the number of tools required increases
Solution Approach 1:
The patent merges multiple cutting elements onto a single turning tool body, physically combining what would traditionally require multiple separate tools. This reduces the quantity of tools needed in the tool magazine while maintaining the versatility to machine complex shapes with different geometries
Solution Approach 2:
The turning tool is designed as a universal platform that can accommodate different cutting elements. This multi-functional design allows one tool to perform the work of multiple specialized tools, reducing the overall tool inventory required
3Speed
If a turning tool rotates around its coupling axis to switch cutting elements, then the switching speed is improved, but the applicability to CNC-lathes is reduced
Solution Approach 1:
The patent segments the cutting elements spatially along the tool axis rather than requiring rotational switching. The first and second cutting elements are positioned at different locations along the tool axis, allowing selection through linear positioning rather than rotation, making the system compatible with standard CNC-lathe tool posts
4Productivity
If indexing time is reduced by using a single tool, then the productivity is improved, but the tool complexity increases
Solution Approach 1:
While the tool body becomes more complex by integrating multiple cutting elements, this complexity is concentrated in one component rather than requiring multiple simple tools. The merged design eliminates indexing operations, and the overall system productivity increases because the tool can switch between cutting elements instantly through linear positioning
Data Source
AI summary
A turning method for a CNC-lathe includes providing a metal work piece and a turning tool having a coupling portion, a first cutting element having a first cutting edge and a second cutting element having a second nose cutting edge separating and connecting a second forward cutting edge and a second rearward cutting edge. The method includes moving the turning tool in a first direction such that the first cutting edge is in cut, moving the turning tool in a direction such that the first cutting edge is moved away from the metal work piece and the second nose cutting edge is moved towards the metal work piece, and moving the turning tool in a second direction such that the second forward cutting edge is in cut at a second entering angle, which is 5-45°, the second direction being in the opposite direction to the first direction.