A New Method for Free Surface Polishing Based on Soft-Consolidation Abrasive Pneumatic Wheel

2012 ◽  
Vol 497 ◽  
pp. 190-194
Author(s):  
Shi Ming Ji ◽  
Xi Zeng ◽  
Ming Sheng Jing
Keyword(s):  
High Hardness ◽  
Polymer Binder ◽  
New Method ◽  
Rubber Matrix ◽  
Free Form ◽  
Silicone Sealant ◽  
Mechanics Model ◽  
Surface Polishing ◽  
Pneumatic Wheel ◽  
Free Form Surface

in order to improve the polishing efficiency to high hardness and high resistance free-form surface of mold, the paper present a new method based on soft-consolidation abrasive pneumatic wheel. The abrasive group is bond to the rubber matrix by the polymer binder. In this way, a flexible pneumatic wheel is formed to get copying contact with the free-form surface for efficient cutting. Combined with the elastic system theory, mechanics model of polishing is found. Scidic silicone sealant is used as the polymer binder, because of its excellent effect of adhesion. The result of experiment shows its wild prospects in the process of polishing.

Soft-Consolidation Abrasives Pneumatic Wheel Technology Oriented to Finishing of High-Hardness Free-Form Surface

2012 ◽  
Vol 523-524 ◽  
pp. 149-154 ◽  
Author(s):  
Shi Ming Ji ◽  
Xi Zeng ◽  
Ming Sheng Jing
Keyword(s):  
Large Scale ◽  
High Hardness ◽  
Rubber Matrix ◽  
Free Form ◽  
Grinding Wheel ◽  
Work Piece ◽  
Mechanics Model ◽  
Pneumatic Wheel ◽  
Self Adaptation ◽  
Free Form Surface

In order to improve the efficiency of high-hardness laser strengthening mold polishing, especially to the free-form surface, a new precision finishing method based on soft-consolidation abrasives pneumatic wheel is brought forward. The pneumatic wheel is constituded by flexible rubber maxtrix, combined with the robbet control. The abrasives group is bond to the rubber matrix by the polymer binder. In the way, compared with those free abrasives used in other polishing method, the soft-consolidation abrasives can get more stable surpport from nearby polymer to form effective cutting. On the other hand, it is unlike the abrasive of rigid grinding wheel because the flexibility of pneumatic wheel can have self-adaptation according to the changes in local curvature and achieve large scale copying contact between tools and work piece. Combined with the lay elastic system theory and Preston equation and coefficients, the mechanics model of polishing is given. The results of experiment shows the Ra of workpiece can be reached to 0.09um and the efficiency of process can be improved three times more than free abrasive machining. It will show its wild prospects in the process of polishing.

Comprehensive error modeling and compensation for optical free-form surface polishing machine tool

2015 ◽  
Vol 23 (6) ◽  
pp. 1587-1597 ◽  
Author(s):  
张恩忠 ZHANG En-zhong ◽  
赵继 ZHAO Ji ◽  
冀世军 JI Shi-jun ◽  
林洁琼 LIN Jie-qiong ◽  
李刚 LI Gang
Keyword(s):  
Machine Tool ◽  
Error Modeling ◽  
Free Form ◽  
Surface Polishing ◽  
Free Form Surface ◽  
Polishing Machine

Form and Texture Control of Free-Form Surface Polishing

2006 ◽  
pp. 113-117
Author(s):  
Shi Ming Ji ◽  
Xian Zhang ◽  
Li Zhang ◽  
Qiao Ling Yuan ◽  
Y.H. Wan ◽  
...  
Keyword(s):  
Free Form ◽  
Surface Polishing ◽  
Free Form Surface

New methods for projecting a 3D object onto a free-form surface

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Jingyu Pei ◽  
Xiaoping Wang ◽  
Leen Zhang ◽  
Yu Zhou ◽  
Jinyuan Qian
Keyword(s):  
Approximate Solution ◽  
New Method ◽  
Free Form ◽  
Parallel Projection ◽  
Content Type ◽  
3D Object ◽  
New Methods ◽  
Free Form Surface ◽  
Newton Raphson ◽  
Raphson Iteration

Purpose This paper aims to provide a series of new methods for projecting a three-dimensional (3D) object onto a free-form surface. The projection algorithms presented can be divided into three types, namely, orthogonal, perspective and parallel projection. Design/methodology/approach For parametric surfaces, the computing strategy of the algorithm is to obtain an approximate solution by using a geometric algorithm, then improve the accuracy of the approximate solution using the Newton–Raphson iteration. For perspective projection and parallel projection on an implicit surface, the strategy replaces Newton–Raphson iteration by multi-segment tracing. The implementation takes two mesh objects as an example of calculating an image projected onto parametric and implicit surfaces. Moreover, a comparison is made for orthogonal projections with Hu’s and Liu’s methods. Findings The results show that the new method can solve the 3D objects projection problem in an effective manner. For orthogonal projection, the time taken by the new method is substantially less than that required for Hu’s method. The new method is also more accurate and faster than Liu’s approach, particularly when the 3D object has a large number of points. Originality/value The algorithms presented in this paper can be applied in many industrial applications such as computer aided design, computer graphics and computer vision.

The Study on the Linking-Up of Free-Form Surface Fiber Placement Track Based on Mesh Creating

2008 ◽  
Vol 392-394 ◽  
pp. 682-687 ◽  
Author(s):  
Zhong Xi Shao ◽  
Hong Ya Fu ◽  
De Cai Li
Keyword(s):  
Projective Plane ◽  
Calculation Method ◽  
New Method ◽  
Free Form ◽  
Parallel Projection ◽  
Reference Vector ◽  
Fiber Placement ◽  
Vertex Point ◽  
Free Form Surface ◽  
Pass Through

When using meshing creating method of FP (fiber placement) track, once the track point falls at some vertex point of mesh element, in the meantime the vertex point happens to be shared by several mesh elements, there needs a reasonable calculation method to select next mesh element which the FP track will pass through. Then it comes to the problem on linking of FP tracks. In order to solve it, in this paper, the author puts forward a new method, in which parallel projection theory is used, project need analytical mesh element and FP reference vector to a sound projective plane, on which the mesh element be selected and the FP track be calculated, then the FP track would be projected back to the placement surface. Program using this method realized a reasonable joint at the shared vertex point of meshing elements, which the FP direction has little change, and the mutation of track doesn’t come forth. So, the correctness of the method, which putted forward in this paper, is proved.

Virtual Five-Axis Milling of Free-Form Surface-Part II: Feed Optimization

2010 ◽  
Vol 29-32 ◽  
pp. 430-435
Author(s):  
Li Qiang Zhang ◽  
Ye Cui Yan
Keyword(s):  
Process Optimization ◽  
Sequential Quadratic Programming ◽  
Tool Path ◽  
Milling Process ◽  
Free Form ◽  
Machining Time ◽  
Mechanics Model ◽  
Finished Surface ◽  
Free Form Surface ◽  
Five Axis

This paper presents process optimization for the five-axis milling based on the mechanics model explained in Part I. The process is optimized by varying the feed as the tool-workpiece engagements. The linear and angular feedrates are optimized by sequential quadratic programming. Sharp feedrate changes may result in undesired feed-marks on the finished surface. The adopted step is to update the the original CL file with optimized and filtered feedrate commands. The five-axis milling process is simulated in a virtual enviroment, and the resulting feedrate outputs are stored at each position along the tool path. The new feedrate profiles are shown to considerably reduce the machining time while avoiding process faults.

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