Vibrating Drill Chuck Motion for Chip Control in Hard Materials
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Solution Overview
Problem
Conventional drilling mechanisms face issues with chip clogging and drill breakage, especially when drilling hard-to-cut materials like titanium, leading to instability and damage during the drilling process.
Innovation Solution
A tool driving device equipped with a vibrating mechanism that periodically reciprocates the drill chuck in the tool axis direction, using a sliding surface with recesses and projections to control the movement of balls, allowing for controlled separation and re-approach to the workpiece, thereby preventing chip clogging and reducing drilling reaction forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a conventional vibrating mechanism is used to cut chips finely, then chip clogging is prevented, but the drill separates from the workpiece and is suddenly pushed out, causing tool pushback or drill damage
Solution Approach 1:
The patent applies dynamics by making the vibration amplitude variable during the drilling process. The vibration amplitude is set to be small during chip discharge to avoid tool pushback and drill damage, while being enlarged during chip clogging prevention. This dynamic adjustment resolves the contradiction between preventing chip clogging and avoiding tool pushback by adapting the vibration characteristics to the specific operational phase.
Solution Approach 2:
The patent changes the vibration parameter (amplitude) based on the operational requirements. By varying the vibration amplitude between small and large values at different stages of the drilling cycle, the system prevents chip clogging when needed while minimizing harmful tool pushback and drill damage during other phases, thus resolving the technical contradiction.
2Strength
If the drill is held with loose force during vibrating mechanism operation, then drill damage is reduced, but the tool driving device is pushed back due to drilling reaction
Solution Approach 1:
The patent uses dynamic vibration amplitude adjustment to control the interaction between the drill and workpiece. During phases where chip clogging is a risk, larger vibration amplitude is applied. During phases where tool pushback could occur, smaller vibration amplitude is used. This dynamic control resolves the contradiction between drill durability and tool pushback prevention.
3Force
If the drill is held with force during vibrating mechanism operation, then tool pushback is prevented, but the drill collides with the workpiece and may be damaged
Solution Approach 1:
The patent resolves this contradiction by dynamically adjusting vibration amplitude based on operational phase. When chip clogging is detected or anticipated, larger vibration amplitude is applied to prevent clogging. When the risk of drill collision is present, smaller vibration amplitude is used to protect drill integrity, thus resolving the contradiction between holding force stability and drill integrity.
4Object-affected harmful factors
If no vibrating mechanism is used, then tool pushback and drill damage are avoided, but continuous chips clog the drill groove
Solution Approach 1:
The patent applies periodic vibration to the drill during operation. This periodic action helps to break up continuous chips and prevent them from clogging the drill groove, while the controlled vibration amplitude ensures that tool pushback and drill damage are avoided. The periodic vibration resolves the contradiction between tool stability and chip clogging prevention.
Solution Approach 2:
The patent uses dynamic vibration amplitude adjustment to resolve the contradiction between tool stability and chip clogging prevention. By varying the vibration amplitude based on operational phase and chip conditions, the system maintains tool stability while effectively preventing chip clogging when necessary.
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
This solution enables stable drilling by effectively dividing chips and reducing the risk of drill breakage, allowing for high-quality hole production in materials like titanium and composite materials, while minimizing user pushback and drill damage.
Implementation Method 1
a vibrating mechanism configured to periodically reciprocate the drill chuck relatively to the casing in a tool axis direction during rotation of the drill chuck
Data Source
AI summary
According to one implementation, a tool driving device includes a drill chuck, a motor, a casing and a vibrating mechanism. The drill chuck holds a drill. The motor is configured to rotate the drill chuck. The casing houses the motor. The vibrating mechanism is configured to periodically reciprocate the drill chuck relatively to the casing in a tool axis direction during rotation of the drill chuck. The vibrating mechanism is configured to distance the drill chuck from the casing at a first speed smaller than a second speed for bringing the drill chuck close to the casing.