NC Lathe Tool Post Control for Continuous Front-Back Machining
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Solution Overview
Problem
Conventional NC lathes require special machining programs to manage tool posts, leading to inefficiencies when switching between machining the front and back sides of a workpiece during continuous machining, as they either continue unintended machining or need separate programs for tool post usage.
Innovation Solution
A machine tool with a controller that determines whether the first tool post is used to machine the workpiece, allowing simultaneous advancement of both systems while preventing front side machining when necessary, or stopping the first system and advancing the second system when the first tool post is not used, eliminating the need for special programs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the first system is continued to run while the second system machines the back side of the unfinished workpiece, then the first system can prepare for the next workpiece, but unintended machining of the front side of the current workpiece occurs
Solution Approach 1:
The patent applies dynamics by making the state of the first system changeable - it can be either running or stopped based on real-time conditions. The controller dynamically adjusts the system state: when the tool post is not used for back side machining, the first system is stopped; when the tool post is used, the first system continues running. This dynamic control resolves the contradiction between maintaining productivity and preventing harmful unintended machining.
2Object-affected harmful factors
If a special machining program is written to manage tool post usage, then unintended machining can be prevented, but programming complexity and time increase
Solution Approach 1:
The patent implements self-service by enabling the controller to automatically determine whether the tool post is being used for back side machining and autonomously decide whether to continue or stop the first system. The controller reads the machining program, identifies tool post usage requirements, and automatically adjusts system operation without operator intervention. This eliminates the need for complex special-purpose machining programs while preventing unintended machining.
3Object-affected harmful factors
If the first system is stopped to prevent unintended machining, then accuracy is improved, but productivity decreases due to system idle time
Solution Approach 1:
The patent applies local quality by differentiating the operational state of the first system based on specific conditions. Instead of uniformly stopping or running the first system, the controller evaluates whether the tool post is required for back side machining and applies different local states: stopped when not needed, running when needed. This localized conditional control prevents unintended machining while maintaining productivity through continuous operation when appropriate.
Data Source
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AI summary
A controller (70) of a machine tool (1) determines in accordance with a machining program PR2 whether a first tool post 30 is used to machine an unfinished workpiece W2. When the unfinished workpiece W2 needs machining before terminating a continuous machining and when the controller (70) determines that the first tool post 30 is used to machine the unfinished workpiece W2, the controller (70) simultaneously advances a first system and a second system in accordance with the machining program PR2 while preventing machining a workpiece W1 held by the first spindle (11). When the controller (70) determines that the first tool post 30 is not used to machine the unfinished workpiece W2, the controller stops the first system and advances the second system in accordance with the machining program PR2.