Drill Chuck Reciprocation Mechanism for Chip-Breaking Stability
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Solution Overview
Problem
Conventional vibrating mechanisms used in tool driving devices for drilling, such as those involving rolling balls, face challenges with chip clogging and drill breakage, especially when drilling hard-to-cut materials like titanium, leading to instability and reduced drilling efficiency.
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 a sliding surface with recesses and projections and balls that roll on this surface, allowing for controlled chip division and prevention of drill clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a conventional vibrating mechanism using rolling balls is used, then chip division is achieved, but the drill separates from the workpiece causing sudden pushing back and potential drill damage
Solution Approach 1:
The patent transitions from a static drilling position to a dynamic reciprocating motion system. The drill chuck is made to reciprocate in the tool axis direction through a mechanism involving inclined surfaces and rolling balls, creating controlled dynamic separation and contact with the workpiece. This dynamic approach allows chip division while managing the drilling reaction force through controlled motion rather than static positioning.
Solution Approach 2:
The patent implements periodic reciprocating motion of the drill chuck in the tool axis direction. The mechanism uses rotating balls on inclined surfaces to create periodic engagement and disengagement of the drill with the workpiece. This periodic action divides chips into smaller segments during the separation phase while maintaining controlled contact during the drilling phase, preventing both chip clogging and sudden pushing back.
2Reliability
If the user holds the tool driving device with force to prevent pushing back, then drill stability is maintained, but the drill collides with the workpiece causing damage
Solution Approach 1:
The patent uses dynamic reciprocating motion to control the interaction between the drill and workpiece. Instead of relying on user force to maintain stability, the system creates controlled dynamic separation that reduces drilling reaction force. The inclined surfaces and rolling balls generate a gradual motion that prevents sudden collisions, protecting the drill from damage while maintaining stability through motion control rather than static force application.
3Reliability
If no vibrating mechanism is used, then drill stability is maintained, but continuous chips clog the drill groove
Solution Approach 1:
The patent implements periodic reciprocating motion to achieve chip division without compromising drill stability. The rotating balls on inclined surfaces create periodic engagement and disengagement, generating controlled vibration that segments continuous chips into smaller pieces. This periodic action occurs during normal drilling operation, maintaining stability while effectively preventing chip clogging in the drill groove.
4Object-generated harmful factors
If a cam-based vibrating mechanism is used, then chip division is achieved, but wear increases causing unstable vibration
Solution Approach 1:
The patent replaces the cam-based mechanical vibration system with a rolling ball mechanism on inclined surfaces. Instead of using sliding contact between cam surfaces that generates wear and unstable vibration, the system uses rolling contact of balls on inclined planes. This substitution eliminates the wear problems associated with cam mechanisms while maintaining effective vibration for chip division, thereby ensuring long-term vibration stability.
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 solution effectively prevents chip clogging and drill breakage by intermittently separating the drill from the workpiece, allowing for stable and efficient drilling of various materials, including hard-to-cut ones like titanium, without causing excessive wear on the vibrating components.
Implementation Method 1
a mechanism which vibrates a spindle by sliding a cam fixed to the spindle, and a mechanism in which vibration is generated by ultrasonic waves are also suggested
Implementation Method 2
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
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.