Lathe Machine Bed Vibration Control via Segmentation
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Solution Overview
Problem
Existing lathes for producing spectacle lenses face challenges in achieving high precision due to vibrations introduced by high-frequency oscillating turning tools, which are exacerbated by the weight and size requirements for sufficient rigidity and vibration suppression.
Innovation Solution
A lathe design with a reduced mass machine bed and optimized mass ratio between the machine bed and linear motor, combined with a compact and rigid structure, allows for improved vibration behavior and reduced machine size, enhancing handling and operation while maintaining necessary rigidity and vibration damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the machine bed mass is increased to suppress vibrations, then vibration suppression is improved, but the machine size and weight increase
Solution Approach 1:
The machine bed is divided into functionally independent modules: a rigid working area module for mounting the linear motor and workpiece spindle, and a separate base module for vibration absorption. This segmentation allows the working area to maintain high rigidity with minimal mass, while the base module handles vibration suppression independently.
Solution Approach 2:
The patent introduces vertical dimensionality by mounting the linear motor and workpiece spindle on upper bearing surfaces while providing vibration decoupling through lower bearing surfaces at a different vertical level. This dimensional separation allows rigid mounting in one vertical plane while isolating vibrations in another, reducing the need for excessive mass in a single structure.
2Ease of operation
If the machine bed mass is reduced for better handling, then ease of operation is improved, but vibration suppression deteriorates
Solution Approach 1:
Vibration decoupling bearings are introduced as intermediary elements between the machine bed and the external support structure. These bearings act as a mediator that transmits necessary support forces while filtering and decoupling harmful vibrations, allowing the machine bed to remain lightweight yet effectively isolated from vibration-prone mounting surfaces.
Solution Approach 2:
The vibration suppression function is extracted from the main machine bed structure and assigned to dedicated vibration decoupling bearings and a separate base module. This extraction allows the primary machine bed to be minimized in mass for ease of handling, while the extracted vibration control subsystem handles the harmful vibrations independently.
3Stability of the object's composition
If the machine bed is made rigid with large wall thicknesses, then rigidity is improved, but the machine size increases
Solution Approach 1:
The machine bed is segmented into a compact upper working area with thick rigid walls for precision machining, and a separate lower base module that provides structural support and vibration absorption. This segmentation allows the rigid working area to be small and compact, while the base module handles structural requirements independently, reducing overall machine bed volume.
Solution Approach 2:
The patent utilizes vertical dimensionality to separate the rigid working area from the support structure. By mounting critical components on upper bearing surfaces and providing support through lower bearing surfaces at a different vertical level, the design achieves high rigidity in the working area without requiring excessive horizontal expansion, thus reducing overall machine bed volume.
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 reduced mass and optimized mass ratio lead to smaller machine size, improved handling, and effective vibration suppression, achieving high precision in spectacle lens production with reduced vibration impact, allowing for more efficient and precise machining processes.
Implementation Method 1
a linear motor with an actuator having a turning tool holder
Implementation Method 2
The machine bed can be mounted vibration-decoupled on a machine frame via damping bearings
Data Source
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AI summary
The machine has machine bed (2) i.e. cast iron bed, comprising two bearing surfaces (2.1, 2.2) for bearing a linear motor and a work piece spindle. A chipping space (2.3) is provided between the bearing surfaces, and partially limited by the machine bed. The linear motor is supported at one of the surfaces (2.1) and the work piece spindle is supported on another surface (2.2) in relation to the chipping space opposite to the linear motor. The bed exhibits maximum mass, which lies between 100 kg and 500 kg, between 150 kg and 300 kg and between 170 kg and 200 kg or 180 kg.