Helical Turning Tool Segmented Roughing Finishing Edges
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Solution Overview
Problem
Existing machining devices for rotationally symmetrical surfaces require frequent use of tools for both roughing and finishing, leading to reduced service life, especially when used repeatedly.
Innovation Solution
A device with a tool featuring a second cutting edge offset by an angle, aligned and movable along a helical path with the first cutting edge, where the first edge is for roughing and the second for finishing, allowing for continuous machining with minimal downtime and extended tool life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the tool is used for both roughing and finishing operations, then productivity is improved by reducing the number of tool changes, but the service life of the cutting edge deteriorates due to increased wear from repeated use
Solution Approach 1:
The tool is segmented into two distinct cutting edges: a first cutting edge optimized for roughing operations and a second cutting edge optimized for finishing operations. This segmentation allows each cutting edge to be specialized for its specific function, extending the overall service life of the tool while maintaining high productivity through continuous operation without tool changes.
2Manufacturing precision
If the cutting edge is oriented obliquely to the axial plane, then twist-free turning is achieved by distributing contact along the cutting edge, but the complexity of the tool geometry increases
Solution Approach 1:
The cutting edge is designed with a helical curve rather than a straight line, creating a curved path that naturally distributes contact along the cutting edge during rotation. This helical geometry achieves twist-free turning by ensuring sequential engagement of cutting edge sections while maintaining a systematic and manufacturable tool design.
3Reliability
If the feed rate is significantly lower than the cutting speed, then the active point moves along the cutting edge enabling continuous engagement, but the machining time increases
Solution Approach 1:
The helical cutting edge geometry combined with rotational movement ensures continuous engagement between the cutting edge and workpiece. As the tool rotates, different sections of the helical cutting edge continuously engage the workpiece, eliminating idle periods and maintaining productive cutting action throughout the operation despite the relatively low feed rate.
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a device (1) for machining by turning rotationally symmetrical surfaces (18, 20 or 22) of a workpiece (10), which is clamped and has a rotating drive, comprising a tool (12) having two cutting edges (16) and (17), each having an approximately helical shape, which are disposed one behind the other in the advancing direction of the tool (12) such that after the machining by turning the second cutting edge (17), a finishing edge, comes into engagement with the first cutting edge (16), a roughing edge.