NC Machine Tool Interference Check Bypass for Repeat Machining
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Solution Overview
Problem
In numerical control machine tools, existing interference check methods require manual visual verification and prolonged program editing, leading to potential errors and increased operator burden, especially during initial product machining.
Innovation Solution
The system automatically stops the machining process when approaching a barrier and allows operators to write a barrier canceling command in the program, enabling interference checks to be canceled in subsequent machining steps where safety is assured, reducing the need for continuous interference checks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If interference check is performed continuously during machining, then safety is ensured, but operator burden increases and productivity decreases
Solution Approach 1:
The system performs preliminary interference checking during the initial product machining phase to identify and record safe zones where tool paths do not interfere with holding means. These pre-identified safe zones are then stored and automatically applied during subsequent machining operations, eliminating the need for continuous operator verification while maintaining safety.
Solution Approach 2:
The system automatically generates and stores barrier canceling commands based on interference check results from initial machining. During subsequent machining, the system self-activates these pre-stored commands without requiring operator intervention, making the safety system self-servicing and reducing operator burden.
2Productivity
If barrier canceling command is written during initial product machining, then subsequent machining efficiency improves, but program editing time increases
Solution Approach 1:
The system automatically generates barrier canceling commands by processing interference check results during initial machining. The control unit self-activates the barrier canceling function based on pre-stored safe zone data, eliminating the need for manual program editing while maintaining high subsequent machining efficiency.
Solution Approach 2:
The system uses feedback from interference check results during initial machining to automatically adjust and store barrier canceling commands. This feedback mechanism allows the system to learn safe zones and automatically update the machining program, reducing manual editing time while ensuring safety in subsequent operations.
3Reliability
If visual interference check is required throughout machining, then safety can be monitored, but operator error risk increases and operation complexity increases
Solution Approach 1:
The system replaces manual visual interference checking with an automated control system that uses pre-stored barrier canceling commands. The control unit automatically determines when to cancel barriers based on machining stage and stored safe zone data, substituting human visual inspection with automated electronic control to eliminate operator error while maintaining safety monitoring.
Solution Approach 2:
The control system automatically manages barrier activation and cancellation based on pre-stored safe zone information from initial machining. The system self-regulates interference checking without requiring continuous operator attention, simplifying operation while maintaining safety through automated monitoring and control.
Data Source
Figure 1
Figure 2(a)~2(c)
Figure 3~4
AI summary
An NC control unit 100 includes a touch panel display device 155 through which a barrier canceling command is input and a machining control section 160 that performs an interference check for interference between a milling tool 70 and a chuck 58 and jaws 60. When the machining control section 160 determines that interference occurs and stops movement of a tool rest 54, the machining control section 160 writes the barrier canceling command that commands cancelation of the interference check for a process of a machining program where the interference has been determined based on manipulation of the display device 155. When the machining program including the barrier canceling command is carried out to machine subsequent workpieces, the machining control section 160 omits the interference check for the process corresponding to the barrier canceling command.