Novel method for optimizing polishing tool-path in CCOS based on weighted-iterative algorithm

2009 ◽  
Author(s):  
Wei-jie Deng ◽  
Xue-jun Zhang ◽  
Xiao-kun Wang ◽  
Xu Wang
Keyword(s):  
Iterative Algorithm ◽  
Tool Path ◽  
Novel Method ◽  
Polishing Tool

Adaptive spiral tool path generation for computer numerical control machining using point cloud

2021 ◽  
pp. 095440622199007
Author(s):  
Mandeep Dhanda ◽  
Aman Kukreja ◽  
SS Pande
Keyword(s):  
Tool Path ◽  
Cnc Machining ◽  
Numerical Control ◽  
Numerical Control Machining ◽  
Form Errors ◽  
Spiral Tool Path ◽  
Novel Method ◽  
Mesh Grid ◽  
Cloud Of Points ◽  
Cam Software

This paper reports a novel method to generate adaptive spiral tool path for the CNC machining of complex sculptured surface represented in the form of cloud of points without the need for surface fitting. The algorithm initially uses uniform 2 D circular mesh-grid to compute the cutter location (CL) points by applying the tool inverse offset method (IOM). These CL points are refined adaptively till the surface form errors converge below the prescribed tolerance limits in both circumferential and radial directions. They are further refined to eliminate the redundancy in machining and generate optimum region wise tool path to minimize the tool lifts. The NC part programs generated by our algorithm were widely tested for different case studies using the commercial CNC simulator as well as by the actual machining trial. Finally, a comparative study was done between our developed system and the commercial CAM software. The results showed that our system is more efficient and robust in terms of the obtained surface quality, productivity, and memory requirement.

Fundamental Investigation on the Polishing Aspheric Elements with Doughnut-Shaped MCF Slurry

2018 ◽  
Vol 792 ◽  
pp. 179-184 ◽  
Author(s):  
Ming Feng ◽  
Yong Bo Wu ◽  
Teruo Bitoh ◽  
Tsunehisa Suzuki ◽  
Mitsuyoshi Nomura ◽  
...  
Keyword(s):  
Experimental Result ◽  
Aspheric Surface ◽  
Aspheric Surfaces ◽  
Variable Parameters ◽  
Flat Surfaces ◽  
Surface Polishing ◽  
Fundamental Investigation ◽  
Novel Method ◽  
Curve Radius ◽  
Polishing Tool

Previous researches have confirmed that MCF (magnetic compound fluid) slurry shows outstanding performance in the nanoprecision polishing of flat surfaces and V-grooves. However, no investigations have been conducted on the polishing of aspheric surfaces using MCF slurry. In this work, a novel method employing a doughnut-shaped MCF polishing tool and a 6-DOF manipulator has been proposed for the aspheric surface polishing. The time consumption for forming stable polishing tool and its final appearance are investigated. Flat aluminum alloy workpieces that can be considered as a kind of aspheric elements with infinite curve radius were adopted in the investigation of the polished forces under variable parameters. As a typical experimental result, with MCF3 slurry, 2.5ml volume of supplied slurry and work gap 3.5 mm, the surface roughness Ra decreases from 125nm to almost 10nm after 90 min polishing, confirming that the proposed method has the potential to polish aspheric surfaces.

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.

Polishing path generation for physical uniform coverage of the aspheric surface based on the Archimedes spiral in bonnet polishing

2019 ◽  
Vol 233 (12) ◽  
pp. 2251-2263 ◽  
Author(s):  
Qizhi Zhao ◽  
Lei Zhang ◽  
Yanjun Han ◽  
Cheng Fan
Keyword(s):  
Tool Path ◽  
Curved Surface ◽  
Path Generation ◽  
Aspheric Surface ◽  
Polishing Process ◽  
Bonnet Polishing ◽  
Archimedes Spiral ◽  
Uniform Coverage ◽  
Polishing Path ◽  
Polishing Tool

As a new polishing method, bonnet polishing is suitable for polishing the curved surface due to its advantages in flexibility and adaptability of the polishing tool. In the polishing process, the contact state between the bonnet and the curved surface always changes. The traditional polishing tool path with equal interval will inevitably lead to over-polished areas and unpolished areas. In this article, a new tool path for bonnet polishing, which is called the revised Archimedes spiral polishing path, is proposed to ensure the physical uniform coverage of the curved surface in bonnet polishing. The path generation method is based on the modified tool–workpiece contact model and the pointwise searching algorithm. To prove the effectiveness of the revised path, two aspheric workpieces were polished along the traditional Archimedes spiral polishing path and the revised path, respectively. The roughnesses of the two workpieces are 10.94 and 10 nm, and the profile tolerances are 0.4097 and 0.2037 μm, respectively. The experimental results show that the revised path achieves lower roughness and surface tolerance than the traditional Archimedes path, which indicates that the revised path can achieve uniform physical coverage on the surface.

Research on Tool-Path Generating Methods for NC Machining of Centrifugal Pump Vanes

2010 ◽  
Vol 26-28 ◽  
pp. 982-987
Author(s):  
Xiu Ting Wei ◽  
Qiang Du ◽  
Jing Cheng Liu
Keyword(s):  
Mathematical Model ◽  
Centrifugal Pump ◽  
Iterative Algorithm ◽  
Tool Path ◽  
Tool Path Generation ◽  
Terminal Condition ◽  
Path Generation ◽  
Contact Parameter ◽  
Nc Program ◽  
The Mathematical Model

The universal NC program was inefficient for machining centrifugal pump vanes and a new tool-path generation method along section lines was proposed in this paper. After analyzing curve characteristics of centrifugal pump vanes, the mathematical model for calculating cutting step-lengths and determining the next tool contact parameter ui+1 through step estimating method was put forward. Furthermore, a new iterative algorithm was implemented, along with its terminal condition simplified. The proposed algorithm provided a new idea for developing special NC program of impellers.

The Kinematics Research of Elliptical Vibration Polishing Based on the Vibration Parameter Optimization

2016 ◽  
Vol 679 ◽  
pp. 7-14
Author(s):  
Dun Lan Song ◽  
Ji Zhao ◽  
Shi Jun Ji ◽  
Xin Wang
Keyword(s):  
Phase Difference ◽  
Parameter Optimization ◽  
Frequency Ratio ◽  
Impact Analysis ◽  
Tool Path ◽  
Curvature Radius ◽  
Vibration Parameter ◽  
Elliptical Vibration ◽  
The Impact ◽  
Polishing Tool

Polishing, the last manufacturing procedure in the process of optics manufacturing, has been restricted by the existed contradictory propositions of efficiency and accuracy. As a result, a variety of new combined processing techniques put forward by researchers in many countries. While, elliptical vibration polishing (short as EVP) well considers efficiency and accuracy in machining. This paper focuses on the kinematics research of EVP tools, and proves the superiority of EVP through the vibration parameter optimization. Perfect tool path gets by the impact analysis of phase difference, frequency ratio and amplitude of the polishing tool. Meanwhile the optimum frequency for EVP is studied from the cost and efficiency perspective. The simulations reveal that the perfect tool path will be obtained in the following situations: phase difference at 90°, frequency ratio at 0.909, adjusts the tool vibration amplitude in consideration of minimum curvature radius in polishing area, and appropriately select the vibration frequency.

Vector Quantization by Minimizing Kullback-Leibler Divergence between the Class Label Distributions over Quantization Input and Output

2014 ◽  
Vol 1006-1007 ◽  
pp. 764-767
Author(s):  
Hao Xiang Wang ◽  
Shan Yue ◽  
Yang Li
Keyword(s):  
Objective Function ◽  
Iterative Algorithm ◽  
Vector Quantization ◽  
The Novel ◽  
Classification Problems ◽  
Class Label ◽  
Bag Of Features ◽  
Input And Output ◽  
Leibler Divergence ◽  
Novel Method

This paper proposes a new method for vector quantization by minimizing the Divergence of Kullback-Leibler between the class label distributions over the quantization inputs, which are original vectors, and the output, which is the quantization subsets of the vector set. In this way, the vector quantization output can keep as much information of the class label as possible. An objective function is constructed and we developed an iterative algorithm to minimize it as well. The novel method is evaluated on bag-of-features based image classification problems.

Study on Compliant Control by Cutter Radius Compensating for Rotating Curved Surfaces Polishing on NC Lathes

2009 ◽  
Vol 416 ◽  
pp. 289-294 ◽  
Author(s):  
Ming Ming Wu ◽  
Jian Ming Zhan ◽  
Jian Bo Zhang
Keyword(s):  
Tool Path ◽  
New Technology ◽  
Automatic Programming ◽  
Curved Surfaces ◽  
Nc Code ◽  
Automatic Polishing ◽  
Compliant Polishing ◽  
Radius Compensation ◽  
Low Efficiency ◽  
Polishing Tool

. Lots of new automatic polishing methods and equipments have been developed to solve the problem of low efficiency and quality in the traditional handwork curved surfaces polishing. However, these methods and equipments are complex and difficult to be applied in the industrial production. This paper proposes a new technology of rotate surface compliant polishing based on NC lathe cutter radius compensation. An efficient and compact rotate surfaces compliant polishing system is developed, which consists of a NC lathe, flexible polishing tool, workpiece, fixture and also the automatic programming software MASTERCAM. The polishing tool-path and NC code can be created in MASTERCAM. The value of the cutter radius compensation can also be set in NC code, so that the rotated surfaces can be polished by a traditional NC lathe. Experiment of polishing the aluminum sphere workpiece is taken, and the satisfying surface quality is achieved.

scholarly journals Coverage Based Tool-Path Planning For Automated Polishing Using Contact Mechanics Theory

2021 ◽  
Author(s):  
Michael Rososhansky
Keyword(s):  
Path Planning ◽  
Contact Mechanics ◽  
Contact Area ◽  
Tool Path ◽  
Tool Path Planning ◽  
Coverage Area ◽  
Modeling And Analysis ◽  
Contact Points ◽  
Polishing Path ◽  
Polishing Tool

Presented in this thesis is a method for tool-path planning for automated polishing. This work is an intergral part of the research program on automated polishing/deburring being carried out at Ryerson University. Whereas tool-path planning for machining is treated as a geometry problem, it ks shown here that tool-path planning for polishing should be treated as a contact mechanics problem because of the contact action between the polishing tool and the part surface. To develop this algorithm, contact mechanics is applied for contact area modeling and analysis, Once the contact area is determined, for multiple contact points along the given polishing path, a map of the contact area is generated and utilized to show the coverage area during polishing. This map is then used to plan a polishing path that ensures complete coverage for polishing, Simulation has been carried out to show the effetiveness of this new polishing path algorithm.

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