Vibrating Drill Chuck Motion to Prevent Chip Clogging
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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 relative to the casing in the tool axis direction, using balls to create a slight amplitude of vibration (0.01 mm to 0.15 mm) to separate the drill from the workpiece, preventing chip clogging and reducing the risk of drill damage by controlling the drilling reaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a conventional vibrating mechanism is used to finely cut and discharge chips, then chip clogging is prevented, but the drill suddenly pushes out toward the workpiece causing drill damage or user pushback
Solution Approach 1:
The patent applies mechanical vibration to the drill chuck through a vibrating mechanism that generates periodic reciprocating motion in the tool axis direction. This vibration finely cuts and discharges chips to prevent clogging, while the controlled asymmetric speed profile prevents sudden impacts that could damage the drill
Solution Approach 2:
The patent changes the motion parameters by implementing asymmetric speeds: the drill chuck is separated from the workpiece at a first speed (smaller than cutting speed) and brought close at a second speed. This parameter change prevents sudden impacts while maintaining effective chip cutting through vibration
2Productivity
If the drill is separated from the workpiece at high speed to prevent chip clogging, then drilling efficiency is improved, but the drill may collide with the workpiece causing damage
Solution Approach 1:
The patent implements periodic reciprocating action of the drill chuck through the vibrating mechanism. The drill periodically separates and approaches the workpiece in a controlled manner, maintaining drilling efficiency while preventing collision damage through repeated low-speed separation cycles
Solution Approach 2:
The vibrating mechanism generates continuous periodic vibration that maintains chip flow and drilling efficiency, while the controlled motion ensures the drill never collides with the workpiece by keeping separation speeds below cutting speeds
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 device effectively prevents chip clogging and drill breakage by intermittently separating the drill from the workpiece, allowing for stable drilling and producing high-quality holes in materials like titanium and composite materials, while reducing user pushback and drill wear.
Implementation Method 1
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
Implementation Method 2
a spindle can be vibrated in the rotation axis direction by putting balls, held by a retainer, in and out from concave portions rotated together with the spindle
Data Source
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AI summary
According to one embodiment, a tool driving device (1) includes a drill chuck (2) , a motor (3), a casing (4) and a vibrating mechanism (8). The drill chuck (2) holds a drill (T). The motor is configured to rotate the drill chuck (2). The casing (4) houses the motor (3). The vibrating mechanism (8) is configured to periodically reciprocate the drill chuck (2) relatively to the casing (4) in a tool axis direction during rotation of the drill chuck (2). The vibrating mechanism (8) is configured to distance the drill chuck (2) from the casing (4) at a first speed smaller than a second speed for bringing the drill chuck (2) close to the casing (4).