Threading Machine Tool Automatic Pass Count Control
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Solution Overview
Problem
Existing machine tools require operators to manually determine the number of same rotation speed cutting passes, making it difficult for unskilled operators to effectively suppress chatter vibrations, especially in alternate flank infeed mode where previous cutting surfaces significantly affect current cutting.
Innovation Solution
A machine tool with a computing section that determines the cutting mode and automatically decides the number of same rotation speed cutting passes based on the cutting mode, incorporating a vibration detecting unit and cutting-mode deciding section to optimize rotation speed changes and reduce chatter vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the main spindle rotation speed is changed according to cutting of one pass before, then the chatter vibrations can be suppressed to some extent, but effective suppression cannot always be expected especially in alternate flank infeed mode where cutting is affected by two passes before
Solution Approach 1:
The system dynamically adjusts the rotation speed variation period based on the cutting mode. In alternate flank infeed mode, the period is set to cover two passes before (affecting both current and previous cutting surfaces), while in radial/flank infeed mode, it covers only one pass before. This dynamic adaptation ensures effective chatter vibration suppression for each specific cutting mode.
Solution Approach 2:
The invention changes the parameter of rotation speed variation period according to the cutting mode. By selecting different periods (1 pass or 2 passes) based on the cutting mode, the system optimizes chatter vibration suppression effectiveness for each specific cutting scenario.
2Object-affected harmful factors
If the operator manually decides the number of same rotation speed cutting passes according to cutting mode, then appropriate vibration suppression can be achieved, but it is not easy for unskilled operators to use
Solution Approach 1:
The machining control unit automatically determines the rotation speed variation period based on the cutting mode without requiring operator intervention. The system serves itself by selecting the appropriate period (1 or 2 passes) according to the cutting mode, eliminating the need for unskilled operators to make complex decisions.
Solution Approach 2:
The system uses feedback from the cutting mode information to automatically adjust the rotation speed variation period. The machining control unit receives cutting mode data and automatically selects the appropriate period, creating a closed-loop system that adapts to different cutting conditions without operator input.
3Object-affected harmful factors
If the rotation speed is changed in every pass, then chatter vibrations can be suppressed, but the complexity of determining the appropriate number of same rotation speed cutting passes increases
Solution Approach 1:
The invention segments the rotation speed control strategy into two distinct patterns: one for radial/flank infeed mode (variation every pass) and another for alternate flank infeed mode (variation every two passes). This segmentation simplifies the control logic by providing clear, mode-specific rules rather than requiring complex continuous decision-making.
Data Source
AI summary
A machine tool includes a number-of-same-rotation-speed-cutting-passes computing section that decides the number of same rotation speed cutting passes. The number-of-same-rotation-speed-cutting-passes computing section determines the cutting mode of a threading process based on a set machining program etc., and automatically decides an optimal number of same rotation speed cutting passes according to the cutting mode. Thus, even unskilled operators can easily suppress chatter vibrations, and can easily use the machine tool.