Spindle Tool Detachment Control After Long Idle Time
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Machine tools with automatic tool changing devices face challenges in efficiently detaching tools from spindles without causing impact or noise, especially when the unused time exceeds a certain threshold, leading to potential damage due to sudden adhesion between the spindle and tool surfaces.
Innovation Solution
A machine tool system that calculates unused time and adjusts the detachment speed based on a predetermined threshold value, reducing the motion speed when unused time is longer than the threshold to prevent excessive impact and noise, and includes a proximity sensor to detect tool presence and adjust operations accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the tool changing device performs detaching motion quickly to improve productivity, then the detachment speed increases and productivity improves, but impact and noise occur due to sudden adhesion between spindle and tool surfaces
Solution Approach 1:
The patent applies dynamics by making the detachment speed variable rather than constant. The control unit adjusts the detachment speed based on the unused time value - using higher speeds when unused time is short and lower speeds when unused time is long, thereby optimizing both productivity and preventing harmful impacts dynamically
Solution Approach 2:
The patent changes the parameter of detachment speed based on the unused time parameter. By comparing unused time against a threshold value, the system selects appropriate speed parameters from predetermined values, achieving optimal balance between productivity and impact prevention through parameter adjustment
2Object-affected harmful factors
If the detaching motion is slowed down to prevent impact and noise, then harmful factors are reduced, but productivity decreases due to longer detachment time
Solution Approach 1:
The system dynamically adjusts detachment speed based on real-time unused time conditions. When unused time is short, high speed is used to maintain productivity; when unused time is long, speed is reduced to prevent impact, thereby optimizing the trade-off dynamically rather than using a fixed conservative speed
Solution Approach 2:
The control unit changes the detachment speed parameter according to the unused time parameter. By selecting from multiple predetermined speed values based on threshold comparisons, the system achieves optimal productivity while preventing harmful effects through intelligent parameter selection
3Device complexity
If a fixed detaching speed is used to simplify control, then device complexity is reduced, but the system cannot adapt to different unused time conditions leading to either impact or wasted time
Solution Approach 1:
The control system implements dynamic speed adjustment by comparing unused time against threshold values and selecting from predetermined speed values. This dynamic control adapts to different operational conditions without requiring complex real-time calculations or multiple sensors
Solution Approach 2:
The system changes detachment speed parameters based on the unused time parameter through threshold comparison. By using predetermined speed values and simple threshold logic, the system achieves adaptive control with minimal complexity increase
Data Source
AI summary
A machine tool includes: a spindle that allows a tool to be detachably mounted thereon; a tool changing device that holds a plurality of the tools, and attaches and detaches any of the tools to and from the spindle; a date and time storage unit that stores date and time when operation of the spindle is stopped last; and a calculation unit that calculates unused time of the spindle on the basis of the date and time stored in the date and time storage unit, when the tool is to be detached from the spindle, wherein in a case where the unused time calculated by the calculation unit is longer than a predetermined threshold value, the tool changing device performs detaching motion of the tool from the spindle for longer time compared to a case where the calculated unused time is at or less than the threshold value.