Lathe-Mill Hybrid for Non-Circular Metal Surfaces
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Solution Overview
Problem
Current machining methods for metallic members with non-circular surfaces, such as those found in electronic device housings, face inefficiencies due to issues like track formation during milling and incompatibility with lathe processes, requiring additional machining steps to address these problems.
Innovation Solution
A combined machining method using a machine with a lathe feeding mechanism and a milling feeding mechanism, which allows for precise control of a lathe tool and milling cutter movements to machine both circular and non-circular surfaces efficiently, including the use of predetermined paths and rotational control to accommodate corners and edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a milling process is employed to machine the metallic housing, then the top portion can be machined, but tracks occur on the top portion because of intermittent contact and interrupted milling by the milling cutter, requiring additional polishing processes
Solution Approach 1:
The patent combines a lathe mechanism and a milling mechanism into a single integrated machine. The lathe mechanism provides continuous rotational motion to the workpiece, while the milling mechanism performs the cutting operation. This combination eliminates the track formation issue by ensuring continuous contact between the cutting tool and the workpiece, while maintaining the ability to machine complex surfaces.
Solution Approach 2:
The integrated machine performs multiple functions: it can rotate the workpiece continuously like a traditional lathe, feed the milling cutter along predetermined paths, and machine both circular and non-circular surfaces. This multi-functionality allows the machine to achieve high surface quality without requiring separate polishing processes.
2Ease of manufacture
If a lathe process is adopted to machine the metallic member, then circular surfaces can be machined, but it is difficult to machine surfaces which are not circular and the peripheral sidewalls with corners
Solution Approach 1:
The patent employs dynamic control of the workpiece rotation and cutter feeding. The workpiece rotation speed and the cutter feeding speed can be independently controlled, allowing the machine to adapt to different surface geometries. This dynamic control enables the machine to machine both circular and non-circular surfaces, including surfaces with corners, by adjusting the motion parameters during the machining process.
Solution Approach 2:
The patent introduces a new dimension of control by adding the workpiece rotation capability to the traditional milling process. This allows the cutting tool to access and machine surfaces that would be difficult or impossible to reach with conventional milling alone, including non-circular surfaces and corners of peripheral sidewalls.
3Manufacturing precision
If traditional milling or lathe processes are used separately, then each process has limitations, but a number of additional machining processes must be added to machine the metallic housing
Solution Approach 1:
The patent merges the lathe mechanism and milling mechanism into a single integrated machine with coordinated control. This combination allows the machine to perform both continuous rotation and precision milling operations simultaneously, eliminating the need for multiple separate processes while maintaining high surface quality.
Solution Approach 2:
The integrated machine provides universal machining capability by combining the advantages of both lathe and milling processes. It can machine various surface types (circular, non-circular, flat, curved) with high precision in a single setup, reducing the total number of processes required while improving overall manufacturing efficiency.
Data Source
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AI summary
A method for machining and finishing a metallic member to provide a finished product without any additional process uses a lathe and a milling/scraping process. A non-circular metallic member on a worktable is rotated, and lathe tool moved backwards and forwards to machine the peripheral top portion of the metallic member. The path of the lathe tool machines curved surfaces of the top portion of the metallic member. The rotation of the metallic member is then stopped, and a milling cutter/scraping cutter is brought to meet the peripheral sidewall of the metallic member. The movement and feeding of the milling cutter/scraping cutter is predetermined. The worktable rotates the metallic member to enable one end edge of the peripheral sidewall and then another to face the milling cutter/scraping cutter, and have the end edge chamfered by the milling cutter/scraping cutter.