Threading Machine Control for Consistent Air Cutting During Oscillation
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Solution Overview
Problem
Existing oscillating machining techniques for thread cutting fail to maintain consistent air cutting due to varying oscillation phase differences, leading to inefficiencies and potential machining defects.
Innovation Solution
A control device for a machine tool that acquires and adjusts oscillation phase difference, cut amount, and oscillation amplitude to ensure a designated air cutting amount, allowing consistent air cutting regardless of phase differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If oscillation phase difference is set to 180 degrees based on known art, then air cutting can be performed, but the technique cannot be applied when phase difference varies from non-180 degrees
Solution Approach 1:
The patent changes the parameter of oscillation phase difference from a fixed 180 degrees to variable values including non-180 degrees, allowing the system to adapt to different machining conditions while maintaining reliable air cutting through dynamic parameter adjustment
Solution Approach 2:
The patent introduces dynamic adjustment of oscillation parameters (phase difference, amplitude, frequency) based on real-time machining conditions, transforming the static 180-degree fixed phase difference into a dynamic system that can adapt to varying requirements
2Ease of operation
If oscillation amplitude is set based on idle motion amount, then air cutting can be achieved, but idle motion cannot be appropriately performed when phase difference is not 180 degrees
Solution Approach 1:
The patent implements feedback control where the actual oscillation phase difference and machining conditions are monitored, and the oscillation amplitude is automatically adjusted based on this feedback to maintain precise idle motion control regardless of phase difference variations
3Reliability
If previous pass and current pass have different frequencies, then air cutting varies from pass to pass, but maintaining same frequency reduces flexibility
Solution Approach 1:
The patent employs periodic oscillation with controlled phase differences between passes, where each pass follows a periodic pattern but with adjustable phase relationships, enabling consistent air cutting while maintaining frequency flexibility for different machining requirements
Data Source
AI summary
Provided is a technology capable of reliably carrying out air cutting during oscillation machining for threading regardless of oscillation phase differences. This machine tool control device 1 comprises: a condition acquisition unit 11 for acquiring, as a precondition, one or two pieces of information among three pieces of information, namely, an oscillation phase difference, information regarding a workpiece radial cut depth, and information regarding a radial oscillation amplitude of the workpiece; an air cut amount acquisition unit 12 for acquiring a specified air cut amount indicating the degree of air cut in the oscillation direction; and a machining control unit 13 for determining (a) piece(s) of information not acquired by the condition acquisition unit 11 among the three pieces of information on the basis of the precondition and carrying out machining control such that an air cut amount based on the interval between the n-th threading path and a threading path subsequent to the n-th path matches the specified air cut amount.