Machine Tool Controller for Thread Cutting Chip Shredding
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Solution Overview
Problem
Existing thread cutting methods face difficulties in shredding chips, particularly when using flank infeed methods, as conventional techniques that apply oscillation only in the radial direction fail to generate the necessary idling for effective chip shredding due to shifts in machining paths in both the X-axis and Z-axis directions.
Innovation Solution
A controller for a machine tool that calculates and applies oscillation amplitudes and directions based on infeed amounts in the radial direction and shift amounts in the circumferential direction relative to the last machining path, enabling relative oscillation between the work and cutting tool to effectively shred chips across various thread cutting methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If oscillation is applied only in the radial direction (X-axis) during thread cutting, then the machining process is simple to control, but chip shredding becomes ineffective when using flank infeed methods due to path shifts in both X-axis and Z-axis directions
Solution Approach 1:
The patent extends oscillation from a single radial direction (X-axis) to a two-dimensional oscillation pattern by incorporating both radial oscillation components and circumferential oscillation components. This dimensional expansion allows the oscillation to effectively cover path shifts in both X-axis and Z-axis directions, enabling reliable chip shredding while maintaining control simplicity through a systematic oscillation application method.
Solution Approach 2:
The patent dynamically adjusts oscillation parameters (amplitude and direction) based on machining conditions including infeed amounts and path shift amounts. By changing the oscillation direction angle θ and amplitude according to the specific machining scenario, the system adapts to different thread cutting methods (radial infeed, flank infeed, alternate infeed) and ensures effective chip shredding without compromising control simplicity.
2Ease of manufacture
If conventional radial oscillation techniques are used, then the system is easy to implement, but it fails to generate necessary idling for effective chip shredding in flank infeed methods
Solution Approach 1:
The patent transforms the static radial oscillation approach into a dynamic oscillation system where the oscillation direction angle θ and amplitude are continuously adjusted based on real-time machining parameters such as infeed amounts and path shift amounts. This dynamic adaptation enables the system to generate appropriate idling for effective chip shredding in flank infeed methods while maintaining ease of implementation through automated parameter calculation.
Solution Approach 2:
The patent implements a feedback mechanism where the oscillation parameters are determined based on detected machining conditions including the last machining path, current infeed amount, and calculated path shift amounts. This feedback loop ensures that the oscillation parameters are optimally adjusted to generate necessary idling for chip shredding, improving manufacturing precision without complicating system implementation.
3Device complexity
If oscillation amplitude and direction are fixed, then the control system is simple, but it cannot adapt to different thread cutting methods and infeed amounts
Solution Approach 1:
The patent creates a universal oscillation control system that can handle multiple thread cutting methods (radial infeed, flank infeed, alternate infeed) and different infeed amounts through a single adaptive oscillation mechanism. By calculating oscillation direction angle θ and amplitude based on generic machining parameters (infeed amount, path shift amount), the system achieves multi-functionality without significantly increasing control system complexity.
Solution Approach 2:
The patent enables the oscillation control system to automatically adjust its parameters based on the machining conditions it detects during operation. The system calculates the required oscillation direction and amplitude using the current infeed amount and path shift amount, making the system self-adapting to different thread cutting methods without requiring external intervention or complex pre-programming for each scenario.
Data Source
AI summary
A controller for a machine tool is configured to shred chips in thread cutting. The controller includes a processor that calculates an oscillation amplitude and an oscillation direction for shredding the chips from lathe-turning machining. The chip shredding is based on an infeed amount in a radial direction of a work and a shift amount in a circumferential direction of the work relative to a last machining path of a tool used for the lathe-turning machining on the work. The processor also calculates an oscillation command for causing the work and the tool to oscillate relative to each other based on the calculated oscillation amplitude and the oscillation direction. The processor then adds a movement command for moving the work and the tool relative to each other for the machining and the oscillation command.