scholarly journals Finishing of Micro-Aspheric Tungsten Carbide Mold Using Small Viscoelastic Tool

2021 ◽  
Author(s):  
Xiangyou Zhu ◽  
Han Wang ◽  
Jiarong Zhang ◽  
Honghui Yao ◽  
Shaomu Zhuo ◽  
...  
Keyword(s):  
Tungsten Carbide ◽  
Influence Function ◽  
Single Point ◽  
Form Error ◽  
Polishing Process ◽  
Speed Distribution ◽  
Aspheric Optics ◽  
Tool Influence Function ◽  
Polishing Tool ◽  
Removal Model

Abstract Tungsten carbide is widely used as the material of replication mold to produce small aspheric optics, and the polishing process determines the precision of the mold. However, for micro-aspheric tungsten carbide mold, the existing polishing methods are difficult to realize the from error modification during the polishing because the polishing tool is always larger than small mold. Therefore, a polishing tool which using polyester fiber cloth to wrap small-size rigid ball is used in this paper. In order to predict the tool influence function (TIF) of this polishing tool, a series of theoretical analysis and experimental verification are carried out in this paper. Firstly, by analyzing the structural and viscoelastic characteristics of the fiber cloth, the pressure distribution in the polishing contact area is determined. And the polishing speed distribution is obtained by analyzing the kinematic movement of the polishing tool; Then, combined with Preston equation, the tool influence function is derived; Afterward, through a series of single point polishing experiments, it is verified that the volume error between the theoretical removal model and the experimental removal is less than 10.8%; Finally, the tool influence function is applied to the form error corrective polishing of small size symmetric aspheric tungsten carbide mold. After one form error corrective polishing, the PV value (Peak to Valley) of form error is decreased from 0.405um to 0.068um, which verifies the effectiveness of the polishing method of small size tungsten carbide mold in form error correction.

Ballonet Polishing of Aspheric Part Based on MRF Torque Servo

2012 ◽  
Vol 201-202 ◽  
pp. 653-656
Author(s):  
Xian Gen Ying ◽  
Di Zheng ◽  
Li Yong Hu ◽  
Jian Ming Zhan
Keyword(s):  
Material Removal ◽  
Decoupling Control ◽  
Polishing Process ◽  
Factors Affecting ◽  
Cnc Lathe ◽  
Working Principle ◽  
Material Removal Model ◽  
Main Factors ◽  
Polishing Tool ◽  
Removal Model

This paper proposed a new ballonet polishing method for the precise polishing of aspheric parts. The method is based on the integration of a MRT (Magnetorheological fluid Torque servo)-based ballonet polishing tool system and a CNC lathe. By using this method, the decoupling control of force-position-posture can be realized in polishing process. The structure and working principle of the polishing tool system were introduced. The material removal model for ballonet polishing was established according to Preston Equation. The main factors affecting the material removal were discussed, and the control model of uniform removal was put forward.

The Control Software of Aspheric Optics in MRF

2012 ◽  
Vol 630 ◽  
pp. 167-170
Author(s):  
Zhi Gang Yuan ◽  
Nan Zheng ◽  
Xian Hua Chen ◽  
Jing Hou
Keyword(s):  
Material Removal ◽  
Polishing Process ◽  
Control Software ◽  
Module Design ◽  
Kernel Module ◽  
Aspheric Optics ◽  
Wavefront Error ◽  
Material Removal Model ◽  
Processing Control ◽  
Removal Model

Based on the mechanism of magnetorheological finishing(MRF), a material removal model was established. The dwell time function was solved by Jansson-Van Cittert algorithm to accomplish the kernel module design. Thus the control software of aspheric optics in MRF was designed. In order to verify accuracy of the processing control software, experiments were carried out on large aperture aspheric optics and the wavefront error of elements was achieved rapidly convergence. It is proved that the software could control the whole polishing process accurately.

An Experimental Investigation of Effect of Process Parameters on Materials Removal Characteristics in Fluid Jet Polishing

2016 ◽  
Vol 679 ◽  
pp. 91-96
Author(s):  
Zhong Chen Cao ◽  
Chi Fai Cheung
Keyword(s):  
Process Parameters ◽  
Influence Function ◽  
Material Removal ◽  
Optical Glass ◽  
Experimental Results ◽  
Visible Range ◽  
Tool Influence Function ◽  
Ultra Precision ◽  
Polishing Machine ◽  
Polishing Tool

Fluid Jet Polishing (FJP) is a promising ultra-precision machining technology which shows great potential with regard to the application value in the generation of freeform surfaces with sub-micrometre form accuracy and nanometric surface finish. The polishing tool influence function (TIF), which is affected by various parameters and commonly assessed in terms of width, maximum depth and volumetric material removal rate, is critically required for corrective polishing and deterministic machining. In this study, a series of experiments was conducted to study the effect of various process parameters on the polishing tool influence function. The polishing machine used is a Zeeko IRP 200 ultra-precision freeform polishing machine, with three linear axes and three rotational axes. All polishing experiments were performed on BK7, which is one of the most common technical optical glass materials for high-quality optical components in the visible range. These specimens were polished using Al2O3 (Aluminium oxide) abrasive particles and measured by a Zygo Nexview 3D Optical Surface Profiler. All these experiments were conducted by changing one process parameter and keeping the other process parameters constant. In this paper, the experimental results are described in detail to show the relationships between the material removal and the various parameters (i.e. slurry pressure, standoff distance, impingement angle, etc.), and some interesting experimental results are explained.

scholarly journals Modeling and simulation of reconfigurable systems with applications to the polishing process

2021 ◽  
Author(s):  
Qiang (John) Sun
Keyword(s):  
Software Package ◽  
Topology Design ◽  
Graphic User Interface ◽  
Polishing Process ◽  
Tree Structures ◽  
Tool Paths ◽  
Simulation And Control ◽  
And Control ◽  
Polishing Tool ◽  
Cam Software

This thesis presents a newly developed system for simulation and control of reconfigurable machines and applications in the polishing process. A software package is developed that consists of the Varying Topology Simulation and Control System (VT-Sim) as well as the Polishing CAM (P-CAM) software system. VT-Sim can simulate and control reconfigurable machines of serial or tree structures. It is developed based on mechatronic modules, each of which has a graphic user interface that can be connected to a physical module. The selected modules are linked through a graph-based topology design platform to generate an assembled system together with the equations for simulation and control. P-CAM can simulate and generate CNC codes for the polishing process. The roughness of the polished parts is simulated for selected polishing parameters. Once satisfied, polishing tool paths can be generated and visualized.

Improving material removal determinacy based on the compensation of tool influence function

2018 ◽  
Author(s):  
Bo Zhong ◽  
Wen-hui Deng ◽  
Shi-jie Zhao ◽  
Nan Zheng ◽  
Xian-hua Chen
Keyword(s):  
Influence Function ◽  
Material Removal ◽  
Tool Influence Function

scholarly journals Development and Application of MRF Based on Robot Arm

2019 ◽  
Vol 215 ◽  
pp. 06001
Author(s):  
Zhang Xuejun ◽  
Li Longxiang ◽  
Xue Donglin ◽  
Song Chi ◽  
Ai Bo
Keyword(s):  
Attitude Control ◽  
Tool Path ◽  
Cost Effective ◽  
Robot Arm ◽  
Optical Fabrication ◽  
Magnetorheological Finishing ◽  
Effective Technique ◽  
Aspheric Optics ◽  
Polishing Tool ◽  
New Machine

Magnetorheological Finishing (MRF) is widely regarded as an effective technique to polish and figure aspheric optics. MRF based on Robot Arm is developed by us. This new machine is more flexible, efficient, cost-effective and smaller space-usage in optical shop, compared with the traditional MRF machines. The components of MRF based on Robot Arm are introduced firstly. Position-attitude control and polishing tool path are also studied in this paper. The experiments and application of MRF based on Robot Arm demonstrate the effectiveness and validity of MRF based on Robot Arm in optical fabrication.

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