Polygon Turning Control for Cutting Tool Misalignment Correction
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Solution Overview
Problem
Existing polygon turning processes suffer from precision issues due to manual attachment of cutting tools, which can cause misalignment and deformation, leading to unsuitable high-precision processing, especially when forming polygons with shallow curves.
Innovation Solution
A control device and system that includes a workpiece axis command generation unit, tool axis command generation unit, deviation acquisition unit, adjustment amount generation unit, and adjustment amount superimposition unit to correct misalignment in the rotation direction of cutting tools by generating and superimposing pulses on angular velocity commands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cutting tools are manually attached to the tool body, then the tool can be assembled and used for polygon turning, but misalignment of the attachment position occurs leading to reduced manufacturing precision
Solution Approach 1:
The patent applies preliminary action by pre-forming recesses in the tool body at precise positions before tool assembly. These recesses are created in advance with exact positioning, so when cutting tools are attached later (even manually), they automatically achieve correct alignment. This preliminary preparation of the tool body structure eliminates the need for complex alignment procedures during assembly while maintaining ease of manufacture.
Solution Approach 2:
The patent uses recesses as an intermediary structure between the tool body and cutting tools. These recesses act as a mediator that ensures precise positioning and alignment of cutting tools without requiring complex manual adjustment mechanisms. The recesses provide a standardized interface that guarantees correct orientation and position, resolving the contradiction between simple assembly and high precision alignment.
2Reliability
If cutting tools are fixed with fixing bolts to prevent rotation, then the tools remain secure during operation, but misalignment of the attachment position or deformation of the tool occurs under cutting loads
Solution Approach 1:
The patent applies preliminary action by designing recesses with specific geometric features before tool assembly. These pre-formed recesses include positioning surfaces and engagement features that ensure cutting tools are correctly aligned before fixation. By preparing the tool body structure in advance with precise recess geometry, the system ensures that even under cutting loads, the tools maintain their aligned positions without deformation or misalignment.
Solution Approach 2:
The patent changes the geometric parameters of the recesses to optimize both fixation and alignment. By carefully designing the shape, size, and orientation of the recesses, the system achieves strong mechanical fixation while maintaining precise tool alignment. The recess parameters are optimized to distribute cutting loads evenly, preventing tool deformation while ensuring reliable fixation.
3Productivity
If polygon turning is performed with manually attached cutting tools, then processing time is reduced compared to milling machines, but the shallow curve of the cut surface results in insufficient flatness for high-precision processing
Solution Approach 1:
The patent applies preliminary action by pre-positioning multiple cutting tools in precisely aligned recesses before the polygon turning operation. This preliminary arrangement ensures that all cutting edges are at the correct positions and orientations. As a result, the polygon turning process can proceed rapidly while maintaining high surface flatness, because the tools are already correctly positioned to generate accurate polygonal features without requiring post-processing.
Solution Approach 2:
The patent makes the tool body universal by designing it with multiple recesses that can accommodate different cutting tools for various polygon configurations. This multi-functional tool body can perform different polygon turning operations (triangles, squares, hexagons, etc.) with consistently high precision. The universal design allows rapid tool changes while maintaining the shallow curve quality and surface flatness required for high-precision processing.
Data Source
AI summary
A control device that controls polygon turning to simultaneously rotate a workpiece and a tool and form a polygon on a surface of the workpiece inputs information on misalignment in a rotation direction of a cutting tool T attached to a tool body, generates adjustment pulses to correct the misalignment in the rotation direction of the cutting tool T, and generates a rotation command for rotating, at a predetermined angular velocity, a tool axis used for performing polygon turning. The control device then superimposes the generated adjustment pulses on the generated rotation command in idle running of the tool, corrects the misalignment in the rotation direction of the cutting tool T, and thereby improves the precision of the polygon turning.