CNC Interference Avoidance Height Calculation for Rotary Tables
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Solution Overview
Problem
Conventional numerical control devices for machine tools with rotary shafts require manual worker intervention or complex tool models to avoid tool interference with rotary tables and workpieces, leading to potential errors and inefficiencies.
Innovation Solution
A numerical control method and device that calculates an interference avoidance height for the tool to prevent collisions, automatically generating commands to adjust the tool's position without manual operation, using a combination of avoidance-height calculation, interference determination, and warning systems to ensure safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual evacuation of the tool is performed by a worker, then tool interference with rotary table or workpiece is avoided, but worker intervention is required and errors may occur
Solution Approach 1:
The numerical control device automatically performs interference avoidance by calculating the interference avoidance height and generating tool shaft movement commands without worker intervention. The system serves itself by monitoring its own operational state and autonomously executing avoidance maneuvers when interference is detected
Solution Approach 2:
The system continuously monitors the rotary shaft position and tool position, compares the current Z-axis height with the calculated interference avoidance height, and automatically generates avoidance commands when interference is detected, forming a closed-loop feedback control system
2Reliability
If interference check using tool models is performed, then tool interference is detected, but complicated tool models must be created for every machine tool kind
Solution Approach 1:
The invention extracts only the essential parameter (Z-axis height) needed for interference detection and compares it with the pre-calculated interference avoidance height, eliminating the need for complex 3D tool models while maintaining reliable interference detection
Solution Approach 2:
The system changes the approach from using complex geometric models to using a simple height parameter comparison. By calculating the interference avoidance height in advance based on machine tool geometry and comparing it with the current tool height, the system achieves reliable interference detection without complex models
3Reliability
If the shaft operation stops immediately before interference, then interference is prevented, but machining time is lost and productivity decreases
Solution Approach 1:
The system calculates the interference avoidance height in advance based on the rotary shaft's movable range and generates avoidance commands proactively when interference is detected, allowing the tool to move to a safe position before the interference actually occurs, thereby preventing complete operation stops
Data Source
AI summary
In order to provide a numerical control method and a device thereof capable of avoiding interference of a tool with a rotary table or a workpiece, without worker's manual operation for performing an interference avoiding operation, there is provided an avoidance-height calculating unit that calculates an interference avoidance height of the tool at which the tool does not interfere with the rotary table and the workpiece over an entire movable range of a rotary shaft to which the movement command is input, an interference determining unit that determines whether the tool will interfere with the rotary table and the workpiece by comparing a current height of a tip of the tool with the interference avoidance height, and an avoiding-operation generating unit that generates a command for movement in a tool shaft direction to the interference avoidance height.