Variable Radius Tool Holder for Lens-Array Mold Machining
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Solution Overview
Problem
Conventional machining methods for lens-array molds face challenges in achieving high-speed and high-precision machining due to difficulties in aligning rotation centers, tool wear, and inefficiencies in machining small-radius concave portions, particularly when trying to maintain precision and prevent tool replacement.
Innovation Solution
A tool holder with a variable tool rotation radius that maintains balance through elastic deformation and centrifugal force, allowing for adjustable tool rotation radius and posture, and a machining method that controls spindle speed and linear axis displacement to achieve precise machining of rotationally symmetrical shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional milling is used to machine lens-array shapes, then machining speed can be increased, but tool wear increases significantly and machining precision decreases
Solution Approach 1:
The invention changes the fundamental machining parameter from high-speed milling to variable-speed rotation. The tool holder rotates at speeds varying from 0 to several thousand rpm, allowing the cutting speed to be dynamically adjusted according to the machining position and requirements, thereby maintaining precision while enabling higher overall productivity
Solution Approach 2:
The tool holder incorporates a rotating mechanism that dynamically adjusts the rotation speed during machining operations. This dynamic control allows the system to optimize cutting conditions in real-time, preventing excessive tool wear while maintaining high machining efficiency across different workpiece regions
2Adaptability or versatility
If a two-axis linear-motion table is mounted on the spindle to change rotation center position, then arbitrary rotation centers can be achieved, but the system becomes too complex and centrifugal force cannot be properly managed
Solution Approach 1:
Instead of using a complex two-axis linear-motion table, the invention employs a dynamic rotation mechanism where the tool holder itself rotates. This allows arbitrary rotation centers to be achieved by controlling the rotation parameters, dramatically simplifying the system while maintaining full adaptability for different lens-array configurations
Solution Approach 2:
The invention replaces the mechanical linear-motion table system with a rotational mechanism. By substituting linear axis movement with controlled rotation of the tool holder, the system achieves the same functionality with fewer components and reduced complexity
3Manufacturing precision
If small-diameter end mill is used to machine small-radius concave portions, then precision can be maintained, but machining efficiency becomes very poor
Solution Approach 1:
The invention changes the cutting mechanism by using a rotating tool holder that can achieve variable cutting speeds. This allows the use of larger tools with higher material removal rates while maintaining precision through controlled rotation, eliminating the need for small-diameter end mills that have poor machining efficiency
Solution Approach 2:
The dynamic rotation of the tool holder enables precise control of cutting conditions even when using larger tools. The variable speed rotation allows the system to maintain high precision for small-radius concave portions while achieving much higher machining efficiency compared to conventional small-diameter end mill operations
4Manufacturing precision
If tool replacement is prohibited to maintain precision, then machining precision is maintained, but it becomes difficult to machine thousands of lens shapes due to tool wear
Solution Approach 1:
The variable-speed rotation mechanism changes the cutting dynamics, distributing wear more evenly and reducing the rate of tool degradation. This allows tools to maintain precision over much longer periods, enabling the machining of thousands of lens shapes without replacement
Solution Approach 2:
The dynamic control of rotation speed allows the system to optimize cutting conditions throughout the tool's lifecycle. By adjusting parameters in real-time, the system maintains consistent precision even as the tool undergoes wear, dramatically extending tool life and enabling high-volume production
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
Enables high-speed, high-precision machining of lens-array shapes by maintaining tool balance and adjusting tool rotation radius and posture, reducing tool wear and improving machining efficiency, allowing for precise cutting of complex surfaces without tool replacement.
Implementation Method 1
a structure which is elastically deformed by a centrifugal force produced as the tool holder rotates around a rotation center axis
Implementation Method 2
a structure which is elastically deformed by a centrifugal force produced as the tool holder rotates around a rotation center axis
Data Source
AI summary
Since a tool holder is formed of a structure which is elastically deformed by a centrifugal force produced as the tool holder rotates around a rotation center axis, the rotation radius of a tool with a cutting edge directed to the rotation center axis varies from zero to an arbitrary value. The structure of the tool holder includes two beams elastically deformable to the same degree in opposite directions by the centrifugal force, and centrifugal force components acting on the two beams cancel each other so that a rotation balance is maintained even when the rotational speed of the tool holder is changed.