Compound Machining with Rotating Tool and Workpiece
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Solution Overview
Problem
Conventional machining processes are limited by the need for specialized machines for each process, and computer numerically controlled (CNC) machines struggle to efficiently perform compound machining operations with both the workpiece and tool rotating, leading to reduced processing power and increased torque.
Innovation Solution
A CNC machine is operated with both the workpiece and tool rotating at surface velocities of at least 25 m/min, allowing for algorithmic determination of processing parameters to achieve a relative velocity that increases processing power without excessive torque, enabling compound machining operations such as knurling and grooving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If both the workpiece and tool rotate at high surface velocities in compound machining operations, then processing power is increased, but torque requirements increase excessively
Solution Approach 1:
The patent applies parameter changes by independently controlling the rotational speed of the workpiece and the rotational speed of the tool, while also controlling their relative linear motion. This allows the surface velocities of both workpiece and tool to be maintained at high levels (at least 25 m/min) to increase processing power, while the algorithmic determination of processing parameters ensures torque remains within acceptable limits by optimizing the combination of rotational speeds and feed rates.
2Manufacturing precision
If conventional machines are used for each specific cutting process, then machining precision is maintained, but device complexity and lack of versatility increase
Solution Approach 1:
The patent implements universality by designing a single CNC machine system capable of performing multiple cutting processes (turning, milling, grooving, knurling, etc.) through algorithmic control of compound machining operations. The machine can rotate both the workpiece and tool simultaneously with independently controlled speeds, and apply algorithmic determination of processing parameters to achieve precision comparable to specialized machines while providing versatility across different machining operations.
Solution Approach 2:
The patent applies dynamics by enabling the machine to dynamically adjust the rotational speeds of both workpiece and tool, as well as their relative linear motion, based on the specific machining operation being performed. This dynamic control allows the same physical machine to adapt to different cutting processes while maintaining precision through algorithmic parameter optimization.
3Productivity
If algorithmic determination of processing parameters is used for compound machining operations, then productivity is improved, but device complexity increases
Solution Approach 1:
The patent implements feedback through algorithmic determination of processing parameters, where the CNC control system calculates optimal rotational speeds and feed rates based on the desired surface velocity requirements (at least 25 m/min for both workpiece and tool) and the specific machining operation. This algorithmic approach automates the complex parameter selection process, improving productivity while the CNC control system manages the complexity through programmed algorithms rather than manual adjustment.
Data Source
AI summary
A method of machining a workpiece may include continuously rotating the workpiece, continuously rotating a tool having at least one cutting surface, and positioning the tool relative to the workpiece so that the at least one cutting surface engages the workpiece at a first discrete location at a periphery of the workpiece. The method may further include continuing to rotate the workpiece and the tool so that the at least one cutting surface engages a second discrete location at the periphery of the workpiece, and controlling a tool surface velocity VT relative to the workpiece surface velocity VW so that the first and second discrete locations are discontinuous. The tool may make multiple iterative passes over the workpiece to engage subsequent discrete locations, wherein the first discrete location, second discrete location, and multiple subsequent discrete locations may form a machined surface that extends continuously around the workpiece.