Spindle Orientation Control to Reduce Drill Bending
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Solution Overview
Problem
Drills tend to bend and break during processing due to limitations in enhancing their strength, leading to damage and inaccuracies in hole formation.
Innovation Solution
A drilling device equipped with a spindle, parallel link mechanism, force sensor, and control section that adjusts the spindle's direction and distance from the object based on detected moments and forces to minimize drill bending and prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the drill strength is enhanced to reduce bending and breakage, then the drill reliability improves, but the device complexity and cost increase due to requiring high-strength materials and stronger spindle structures
Solution Approach 1:
The control section continuously monitors the moment detected by the force sensor and dynamically adjusts the parallel link mechanism to counteract detected moments, creating a closed-loop feedback system that protects the drill without requiring high-strength materials
Solution Approach 2:
The parallel link mechanism acts as an intermediary between the spindle and the external moment, absorbing and counteracting bending forces before they reach the drill, thereby protecting the drill without needing to enhance its inherent strength
2Device complexity
If a common drill is used to reduce cost, then the device complexity decreases, but the drill bends and breaks more easily during processing
Solution Approach 1:
The force sensor and control section create a real-time feedback system that detects moments acting on the drill and automatically adjusts the parallel link mechanism to counteract these moments, protecting common drills from bending and breakage
Solution Approach 2:
The patent replaces the mechanical solution of using high-strength drills with a control-based solution using sensors and actuators to actively counteract forces, allowing the use of simpler, less expensive drills
3Productivity
If the drill is pressed against the object to be processed to improve processing speed, then productivity increases, but the drill wobbles and bends more easily
Solution Approach 1:
The control section uses real-time moment detection to dynamically adjust the parallel link mechanism during high-speed processing, counteracting wobbling and bending forces that increase with pressing force
Solution Approach 2:
The parallel link mechanism provides dynamic compensation for drilling forces, allowing the drill to be pressed harder for faster processing while the active control system continuously counteracts the increased bending moments
Data Source
AI summary
A reduction of a bend of a drill during processing is achieved. A drilling device includes: a spindle for rotating a drill so that the drill processes an object; a parallel link mechanism configured to adjust a direction of the spindle; a force sensor configured to detect a moment from the object and about an axis perpendicular to an axial direction of the spindle while the object is processed; and a control section configured to control the parallel link mechanism on the basis of the moment detected by the force sensor so that the parallel link mechanism adjusts a direction of the spindle.