Deep Hole Drill Stiffness Control for 3D Vibration Damping
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Solution Overview
Problem
Current deep hole drilling systems lack effective three-dimensional vibration damping, particularly in the radial direction, which affects machining precision and accuracy, especially as drilling depth increases, and there is a need for localization technology to reduce dependence on imported equipment.
Innovation Solution
A deep hole drilling system with a stiffness control mechanism using MR fluid that includes a vibration detection sensor, a stiffness controller, and a controller to adjust the viscosity of the MR fluid, allowing for independent control of MR fluid storage spaces along the axial direction to damp both axial and radial vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional drilling methods are used for deep holes, then drilling depth can be achieved, but vibration in axial and radial directions increases, reducing machining precision
Solution Approach 1:
The patent changes the physical parameter of the drill system by controlling the viscosity of MR fluid through magnetic field strength adjustment. This dynamically alters the stiffness of the drill, allowing the system to adapt to vibration conditions at different depths, thereby reducing vibration while maintaining machining precision.
Solution Approach 2:
The patent introduces a dynamic vibration damping system where the stiffness of the drill is not fixed but can be adjusted in real-time based on vibration detection. The controller modifies magnetic field strength according to drilling depth and vibration levels, making the drill adaptable to changing conditions throughout the deep hole drilling process.
2Length of moving object
If drilling depth increases, then deeper holes can be machined, but vibration damping efficiency of conventional systems decreases
Solution Approach 1:
The patent utilizes parameter changes in MR fluid viscosity through magnetic field control to maintain vibration damping efficiency at increased drilling depths. By adjusting the magnetic field strength, the system compensates for the reduced damping efficiency that naturally occurs with greater depth, ensuring reliable vibration control throughout the entire drilling process.
Solution Approach 2:
The patent implements a feedback mechanism where vibration sensors detect axial and radial vibrations, and the controller adjusts magnetic field strength accordingly. This closed-loop system ensures that vibration damping efficiency is maintained regardless of drilling depth, as the system continuously adapts to the changing conditions.
3Object-affected harmful factors
If MR fluid storage spaces are divided along axial direction with independent control, then three-dimensional vibration damping improves, but device complexity increases
Solution Approach 1:
The patent divides the MR fluid storage space into multiple segments along the axial direction, each with independent magnetic field control. This segmentation allows different regions of the drill to be optimized for specific vibration directions (axial vs. radial), enabling comprehensive three-dimensional vibration damping through coordinated control of multiple segments.
Solution Approach 2:
The patent designs the divided MR fluid storage spaces to serve multiple functions: each segment can independently damp vibrations in different directions, and collectively they provide comprehensive three-dimensional vibration control. This multi-functionality justifies the increased device complexity by delivering superior vibration damping performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves efficient three-dimensional vibration damping regardless of drilling depth, improving machining precision and surface quality by controlling the stiffness of the drill through real-time feedback from acceleration sensors and viscosity adjustments of the MR fluid.
Implementation Method 1
controls the stiffness of the drill by controlling the viscosity of MR fluid
Implementation Method 2
vibration detection sensor which is provided on the drill body and detects vibration of the drill head
Data Source
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AI summary
The present disclosure relates to a deep hole drilling system (1000) which processes a deep hole having a depth 10 times to 150 times or more greater than a diameter of the hole, and more particularly to a deep hole drilling system which is equipped with a stiffness control means (D) capable of controlling the stiffness of a drill such that axial and radial vibrations of the drill are reduced, so that the deep hole drilling system has a high machinability, a precise and accurate straightness, and roundness.