B-Axis Lathe Feed Mapping for Constant Chip Thickness
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Solution Overview
Problem
Conventional B-axis lathe machines lack an automatic feed rate calculation for maintaining constant chip thickness, especially when using non-circular shaped inserts like rhombic inserts, which limits their efficiency and surface finish quality.
Innovation Solution
The method involves creating a feed map that provides feed rates at specified tool angles and chip thicknesses, splitting the tool path into subsegments, and interpolating dynamic feed rates and angular positions to maintain a constant chip thickness during machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional B-axis lathe machines are used without automatic feed rate calculation, then the machining process can be performed, but the chip thickness cannot be maintained constant leading to poor surface finish and reduced tool life
Solution Approach 1:
The invention dynamically adjusts the feed rate parameter based on the tool's angular position and the desired constant chip thickness. The control system continuously calculates and modifies the feed rate to compensate for changes in tool orientation, ensuring consistent chip thickness throughout the machining process despite the varying angular positions of the B-axis tool.
2Manufacturing precision
If the tool path is divided into many segments for precise angular positioning, then the chip thickness control improves, but the computational complexity and processing time increase
Solution Approach 1:
The tool path is divided into discrete segments with preset angular positions that correspond to specific tool orientations. At each segment, the control system calculates the appropriate feed rate based on the desired chip thickness and current angular position. This segmentation approach enables precise control while managing computational complexity through structured, discrete calculation points rather than continuous computation.
3Duration of action of moving object
If dynamic feed rate adjustment is implemented to maintain constant chip thickness, then tool life and surface finish improve, but the machining process complexity increases
Solution Approach 1:
The control system uses feedback from the tool's angular position (B-axis position) to dynamically adjust the feed rate. The system continuously monitors the current tool orientation and calculates the appropriate feed rate to maintain constant chip thickness, creating a closed-loop control mechanism that adapts to varying machining conditions without requiring complex manual intervention.
Data Source
Figure 1(a)~1(j)
AI summary
Method of machining a workpiece (WPC) by means of a B-axis lathe machine (MCH), where the method involves the continuous change of the angular position (AGP) of a turning tool (TTL), the method comprising the following steps: (a) Providing a workpiece (WPC) raw contour geometry (RCG), (b) Providing a workpiece (WPC) target contour geometry (TCG), (c) Providing a predetermined chip thickness (CPT) as target chip thickness (CPT) during machining, (d) Providing a tool path (TPT) of the turning tool (TTL), (e) Providing preset angular positions (PAP) of the turning tool (TTL), characterized by the method including the additional steps: (f) Providing a feed map (FMP) that provides a feed rate (FDR), (g) Splitting the tool path (TPT) segments (SGT) into tool path (TPT) subsegments (SSG) with a predefined segment length (SGL), (h) Determining angular positions (AGP) at the segment (SGT) end positions (EPT) by interpolating (ITP) between the positions of specified tool angle (TAP), (i) Determination of the feed rate (FDR) at the segment end positions (SGT) by specifying the respective preset local angular positions (PAP) to the feed map (FMP), (j) Determining of a dynamic feed rate (DFR) and a dynamic angular position change (DAP) from an interpolation (ITP) along the segment (SGT) tool path (TPT) between the respective segment (SGT) end position (EPT) parameters, and machining the workpiece (WPC) in such a way that the tool position is continuously changed between the preset angle positions, while the tool is moved along a tool path (TPT) according to a feed calculation based on the specified chip thickness (CPT).