Thread-Cutting Control with Intermittent Radial Oscillation
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Solution Overview
Problem
Existing machine tool control devices face high load and incomplete cutting issues during thread cutting due to continuous oscillating operations, leading to increased cycle time and difficulty in shredding chips effectively.
Innovation Solution
A control device that coordinates spindle and feed axis operations, including an oscillating operation execution determination unit to intermittently execute oscillating and non-oscillating operations, generating oscillation commands to ensure previous cutting portions are included in subsequent operations, thereby reducing machine tool load and ensuring reliable chip shredding without extending cycle time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous oscillating operation is performed during thread cutting, then chip shredding is improved, but machine tool load increases and cycle time extends
Solution Approach 1:
The patent applies periodic action by alternating between oscillating operation and non-oscillating operation in a periodic manner during thread cutting. The control device switches between these two operation modes based on predetermined conditions, such as after a certain number of passes or when specific machining conditions are met. This periodic alternation allows the system to achieve chip shredding benefits during oscillating phases while reducing machine tool load and cycle time during non-oscillating phases, thereby resolving the contradiction between reliable chip shredding and productivity.
2Manufacturing precision
If oscillating operation is performed, then cutting performance is improved, but positional deviation increases causing incomplete cutting
Solution Approach 1:
The patent uses periodic alternation between oscillating and non-oscillating operations to address positional deviation issues. During oscillating operation phases, cutting performance is enhanced, while subsequent non-oscillating operation phases allow the system to correct positional deviations and ensure complete cutting. This periodic switching strategy enables the system to enjoy the benefits of oscillating operation without suffering from cumulative positional errors, as the non-oscillating phases serve as correction intervals.
Solution Approach 2:
The control device incorporates feedback mechanisms to monitor positional deviation during oscillating operation and adjust subsequent non-oscillating operation parameters accordingly. By detecting positional errors accumulated during oscillating phases and compensating for them in non-oscillating phases, the system maintains both cutting quality and positional accuracy throughout the thread cutting process.
Data Source
AI summary
To provide a control device for a machine tool capable of performing thread cutting while reducing the load on the machine tool from the oscillating operation, without extending the cycle time, and capable of reliably shredding chips in a case of performing the non-oscillating operation in the present pass after the oscillating operation in the previous pass. A control device for a machine tool includes: an oscillating operation execution determination unit that determines whether to execute an oscillating operation that causes the cutting tool to oscillate in the radial direction of the workpiece; an oscillation command generation unit that generates an oscillation command of the oscillating operation based on a determination result; a control unit that superimposes the oscillation command on a position command of the feed axis to generate a drive command. The oscillating operation execution determination unit determines to intermittently execute the oscillating operation, and the oscillation command generation unit generates an oscillation command so that a non-oscillating cutting portion of a present pass includes a portion at which oscillating cutting was performed in a previous pass, or so that an oscillating cutting portion of the present pass includes a portion at which non-oscillating cutting was performed in the previous pass.