NC Machine Tool Control for Mixed Oscillation Cutting Precision
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Solution Overview
Problem
Machine tools with multiple machining systems face challenges in preventing tool oscillation from adversely affecting machining precision, as vibrations from oscillation cutting can degrade the precision of non-oscillation cutting processes.
Innovation Solution
A numerical control device that includes a condition change unit, which adjusts machining conditions in real-time to mitigate the impact of tool oscillation on machining precision by delaying the start of oscillation cutting or reducing vibration frequencies and amplitudes, ensuring that non-oscillation cutting is not compromised by vibrations from adjacent machining systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If oscillation cutting is performed in one machining system, then chip length is controlled and machining continuity is improved, but vibrations are generated that degrade the machining precision of other machining systems
Solution Approach 1:
The control device detects when oscillation cutting is performed in one machining system and proactively adjusts the machining conditions of other machining systems before precision degradation occurs. This includes switching to dry cutting, adjusting feed rates, or modifying cutting depths in response to detected oscillation vibrations, thereby preventing precision loss in advance.
Solution Approach 2:
The system continuously monitors vibration levels and machining conditions across multiple machining systems, using this feedback to dynamically adjust operating parameters. When oscillation cutting is detected in one system, the control device receives feedback about the vibration state and automatically modifies the machining conditions of other systems to maintain precision while allowing oscillation cutting to continue.
2Manufacturing precision
If non-oscillation cutting is performed to maintain machining precision, then machining precision is preserved, but chip coiling occurs and machining efficiency decreases
Solution Approach 1:
The system dynamically switches between oscillation cutting and non-oscillation cutting modes based on real-time detection of other machining system activities. When no oscillation is detected in other systems, the system employs oscillation cutting for improved chip evacuation and efficiency. When oscillation is detected, it transitions to non-oscillation or adjusted cutting modes to maintain precision, creating a flexible adaptive cutting strategy.
Solution Approach 2:
The control device changes machining parameters such as oscillation amplitude, frequency, feed rate, and cutting depth based on the operational state of other machining systems. By adjusting these parameters dynamically, the system optimizes the balance between chip evacuation efficiency and machining precision according to real-time workshop conditions.
3Productivity
If multiple machining systems operate simultaneously with mixed oscillation and non-oscillation cutting, then productivity is improved, but vibration interference between systems degrades overall machining precision
Solution Approach 1:
The control device serves multiple machining systems simultaneously, providing unified vibration detection and coordinated condition adjustment across all systems. This multi-functional control approach allows the workshop to maintain high productivity through parallel operation while ensuring precision is preserved across all machining operations through centralized monitoring and adjustment.
Solution Approach 2:
The system divides the control strategy into independent detectable units for each machining system, tracking oscillation states and machining conditions separately for each system. This segmented approach allows precise control of each system's contribution to overall vibrations, enabling the workshop to optimize the mix of oscillation and non-oscillation cutting across multiple systems while maintaining overall precision.
Data Source
AI summary
A numerical control device according to an aspect of the present disclosure controls, in accordance with a machining program, a machine tool that includes a plurality of machining systems performing machining by each causing a tool to act on a workpiece, and can perform tool oscillation that causes a relative speed of the tool in relation to the workpiece to periodically change in at least one of the machining systems, the numerical control device including: a condition change unit which, upon newly starting machining by one of the machining systems, in a case of another of the machining systems performing machining for which a presence/absence of the tool oscillation differs from the newly starting machining, changes a condition of the newly starting machining or the machining for which the presence/absence of the tool oscillation differs, from a condition derived from the machining program.