Work Spindle Solid-Body Joint for Precision Lens Machining
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Solution Overview
Problem
High-speed machining processes in nonround lathes for plastic lenses and spectacle glasses face challenges in maintaining precise tool positioning and dynamic adjustment due to heat-related expansions and oscillations, which existing technologies fail to address effectively.
Innovation Solution
A subassembly featuring a solid-body joint that allows the machining unit to pivot or tilt, coupled with a linear motor and actuator, providing stiff rigidity and precise adjustment without the need for additional adjusting elements, ensuring the tool tip can be accurately positioned at the center of rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a solid-body joint is used for height adjustment of the tool, then the tool position can be adjusted, but heat-related expansion affects two position values requiring continual calibration
Solution Approach 1:
The patent replaces the traditional mechanical height adjustment mechanism with a tilted linear axis that provides both feed motion and perpendicular motion component through tilting. This substitution eliminates the need for separate height adjustment mechanisms and reduces calibration complexity despite thermal expansion, as the tilting mechanism inherently compensates for position changes.
2Adaptability or versatility
If additional adjusting elements are used to position the machining unit, then the relative position can be adjusted, but the stiffness and rigidity of the system decreases
Solution Approach 1:
The patent merges the position adjustment function directly into the solid-body joint structure itself, eliminating the need for additional adjusting elements. The solid-body joint provides both the structural support and the adjustment capability through its design, maintaining system stiffness while enabling position adaptation.
Solution Approach 2:
The solid-body joint is designed to perform multiple functions simultaneously: it provides structural support, enables position adjustment, and maintains system rigidity. This multi-functionality eliminates the need for separate adjusting elements that would compromise stiffness.
3Productivity
If the tool mount is made lightweight for dynamic machining, then the machining speed increases, but the force to be absorbed by adjustment mechanisms increases
Solution Approach 1:
The patent replaces traditional adjustment mechanisms with a solid-body joint design that inherently handles the forces generated during high-speed dynamic machining. The solid-body joint's structural design allows it to absorb adjustment forces without requiring additional heavy-duty components, maintaining both speed and force absorption capability.
Data Source
AI summary
A subassembly with a supporting element for a machine bed of a lathe, and of a machining unit which is arranged on the supporting element and has a machining axis, wherein a solid-body joint, via which the machining unit is arranged in a movable manner on the supporting element, is provided. A lathe for plastics spectacle lenses, having a machine bed, having a tool mount or workpiece mount which is arranged at least indirectly on the machine bed, and having a subassembly which is arranged at least indirectly on the machine bed, wherein the workpiece and the tool can be oriented in relation to one another via the solid-body joint.