Groove-forming method, control device for machine tool and tool path generating device
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Solution Overview
Problem
Current groove-forming methods face challenges in achieving precise machining of large width grooves, as they require either a large rotary tool that cannot be adjusted for fine width adjustments or a dedicated tool head with limited rigidity and increased machining time, leading to low precision and longer processing times.
Innovation Solution
A groove-forming method that uses a rotary tool with a diameter smaller than the groove width, employing a combination of rotational and linear feed axes to move the tool relative to the workpiece in a circular path, allowing for multiple passes to inscribe the tool inside a circle matching the groove width, enabling precise machining without the need for a tool of equal diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a large-sized rotary tool with the same diameter as the groove width is used, then the groove width can be formed correctly, but fine adjustment of the groove width becomes impossible and tool replacement is required for different groove widths
Solution Approach 1:
The invention applies dynamics by making the rotary tool's diameter variable through extension. The tool can dynamically adjust its effective diameter by extending or retracting, allowing it to match different groove widths while maintaining precision. This resolves the contradiction by enabling both precise groove formation and adaptability to different widths without tool replacement.
Solution Approach 2:
The invention changes the parameter of tool diameter from fixed to variable. By using an extendable rotary tool mechanism, the diameter parameter can be adjusted to match different groove widths. This allows the same tool to perform multiple functions with different groove width requirements, resolving the contradiction between precision and adaptability.
2Adaptability or versatility
If a dedicated tool head with planetary rotation motion is used, then groove formation is possible, but the tool head has lower rigidity, reduced cutting depth capability, and longer machining time
Solution Approach 1:
The invention extracts the planetary rotation mechanism from the tool head and implements it directly in the workpiece. By making the workpiece rotate around the rotary tool instead of the tool head performing planetary motion, the system eliminates the need for a complex dedicated tool head. This reduces tool head rigidity requirements and shortens machining time while maintaining groove formation capability.
Solution Approach 2:
The invention inverts the traditional planetary rotation approach by making the workpiece rotate around the tool rather than the tool performing planetary motion. This reversal simplifies the tool head structure, improves rigidity, and reduces machining time while achieving the same groove formation result.
3Adaptability or versatility
If a rotary tool with diameter smaller than groove width is used, then flexibility and adjustment are improved, but multiple passes are required increasing machining time
Solution Approach 1:
The invention applies dynamics by enabling the rotary tool to extend its diameter during the machining process. Instead of using a small fixed tool requiring multiple passes, the tool dynamically increases its effective diameter to match the groove width, completing the operation in a single pass and reducing machining time while maintaining flexibility.
Solution Approach 2:
The invention performs preliminary action by pre-extending the rotary tool to the required diameter before machining begins. This eliminates the need for multiple passes with progressively larger tools or a small tool making multiple trips, as the tool is already configured for the final groove width from the start.
Data Source
AI summary
A fluting method for forming a flute in a workpiece while the workpiece is moved relative to a rotating tool by the combination of a rotating feed shaft with other feed shafts, the method comprising a machining process of relatively moving the rotating tool on a tool path that runs along the direction in which the flute extends and machining the workpiece using a rotating tool with a diameter that is smaller than the width of the flute. The machining process changes the relative position of the rotating tool with respect to the workpiece and performs machining multiple times so that the rotating tool makes internal contact with a circle that has the width of the flute being formed in the workpiece as the diameter.