Machine Tool Control Device with Tool-Specific Speed Limits
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Solution Overview
Problem
Commercially available machine tools often suffer from damage due to incorrect speed rotation and acceleration settings, which can lead to severe consequences for the tool, the machine, and personnel, as they are optimized for smaller tools but may cause detachment or high-speed hazards with larger or more complex tools.
Innovation Solution
A control device that includes a memory for storing tool-specific movement limit values, a desired value generating unit, and a limiting unit to adjust and monitor movement parameters such as speed, acceleration, and jerk, preventing these values from exceeding safe limits, and includes a monitoring unit to alert and control braking to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the control device generates desired values to reach the predefined speed of rotation as quickly as possible using maximum acceleration capacity, then productivity is improved, but the tool may become detached from the tool receiving apparatus causing severe damage
Solution Approach 1:
The control device dynamically adjusts acceleration and speed parameters based on tool-specific characteristics stored in memory. Instead of using fixed maximum acceleration for all tools, the system modifies acceleration rates and speed limits according to each tool's mass, geometry, and attachment requirements, preventing tool detachment while maintaining efficient operation
Solution Approach 2:
The control device monitors actual tool movement and acceleration in real-time, comparing it against predefined safety thresholds. When approaching critical values that could cause detachment, the system provides feedback to reduce acceleration or speed, creating a closed-loop control system that prevents tool detachment while optimizing productivity
2Productivity
If a high speed of rotation is defined for a large milling cutter in the parts program, then productivity is improved, but severe damage may result due to excessive speed
Solution Approach 1:
The control device stores and applies tool-specific maximum speed limits in memory based on tool characteristics such as size, mass, and geometry. For large milling cutters, the system automatically enforces lower maximum speed thresholds, while allowing higher speeds for smaller tools, thereby optimizing productivity for each tool type without exceeding safe operational limits
Solution Approach 2:
The system pre-configures safe operating parameters including maximum speed and acceleration limits in memory before tool operation begins. These preliminary safety parameters are loaded based on tool identification, ensuring that speed and acceleration commands never exceed tool-specific thresholds, preventing damage before it can occur
Data Source
AI summary
A control device for controlling a machine tool which can be used to drive tools includes a memory for storing a movement limit value which is respectively assigned to the tools and is specific to the respective tool. A desired value generating unit generates desired values for controlling the movement of the tool. The desired values are limited by a limiting unit on the basis of the assigned movement limit value in such a manner that the movement limit value is not exceeded when moving the tool.