scholarly journals A Non-Geodesic Trajectory Design Method and Its Post-Processing for Robotic Filament Winding of Composite Tee Pipes

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 847
Author(s):  
Cheng Chang ◽  
Zhenyu Han ◽  
Xinyu Li ◽  
Shouzheng Sun ◽  
Jihao Qin ◽  
...  
Keyword(s):  
Complex Shape ◽  
Design Method ◽  
Filament Winding ◽  
Trajectory Design ◽  
Post Processing ◽  
Processing Methods ◽  
Specific Strength ◽  
Cad Cam ◽  
Winding Machine ◽  
Cam Software

With the advantages of high specific strength and well corrosion resistance, polymer-matrix composite tee pipes are widely used in aerospace and civilian fields. The robotic filament winding technology is suitable for forming complex shape parts. This paper aims to provide a novel non-geodesic trajectory design method to get a continuous trajectory for tee pipe winding. Furthermore, post-processing methods are proposed for realizing the full coverage of tee pipes by robotic filament winding. The CAD/CAM software is then designed to simulate the winding process and realize the cover of the whole tee pipe. Finally, experiments of winding a tee pipe with a desktop winding machine and a six-axis winding robot are carried out. The results show that the tee pipe is fully covered, verifying the accuracy of the design method and post-processing methods.

Design of Deposition Head Trajectory for Robotized Filament Winding of Complex Shape Parts

2004 ◽  
Author(s):  
W. Polini ◽  
L. Sorrentino
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Complex Shape ◽  
Experimental Tests ◽  
Filament Winding ◽  
Structural Constraints ◽  
Cad Cam ◽  
Cam Software ◽  
Wound Composite

When the roving is winding on the die, the tension value may move away the nominal one that has been optimized by considering the quality and the mechanical properties of the wound composite parts. The variance of the tension value during winding from the nominal one strongly depends on the deposition head trajectory. The present work focuses on the planning of the winding trajectory for winding complex shape parts in composite material by a robotized cell. The planning of the winding trajectory should be based on the structural constraints of the robotized cell and on the technological requirements of the process. In particular, this work aims to study the conditions by which the value of the roving tension verges on the nominal one during winding. The developed planning logics and implemented by a CAD/CAM software have been validated by experimental tests. This work represents the first step towards the optimization of the winding trajectory.

scholarly journals Development of a Tool Design Method in Cross Wedge Rolling: Description and Applications

2014 ◽  
Vol 611-612 ◽  
pp. 1694-1701
Author(s):  
Catalina Gutierrez ◽  
Philippe Mangin ◽  
Laurent Langlois ◽  
Régis Bigot
Keyword(s):  
Design Method ◽  
Stability Index ◽  
Tool Geometry ◽  
Geometrical Parameters ◽  
Cross Wedge Rolling ◽  
Know How ◽  
Cad Cam ◽  
Definition Of ◽  
Cam Software

Till now, the definition of cross wedge rolling dies requires know-how and important expertise from the designers. A decision-making methodology is being developed to provide sequential and logical steps to draw easier and faster the tool geometry. This methodology is based on designing rules found in literature that link the geometrical parameters of the desired rolled part and the geometrical parameters of the tool. Nevertheless, in the literature, the rules are not always consistent because the admissible domain for a parameter can differ from one author to another. In order to take into account this variability, a stability index is associated to each rule and to the designed tool. The methodology allows updating of the existing rules and the implementation of new rules. The set of parameters defining the geometry of the tool can be exported in the CAD/CAM software and FEM software. A case-study is presented to illustrate and validate the methodology.

Research on Micro Gear Design for WEDM

2011 ◽  
Vol 211-212 ◽  
pp. 315-319
Author(s):  
Tie Li Ye ◽  
Ke Wei Hu ◽  
Lu Ling An
Keyword(s):  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Design Method ◽  
Gear Tooth ◽  
Wire Electrical Discharge Machining ◽  
Path Generation ◽  
Gear Design ◽  
Cad Cam ◽  
Cam Software

WEDM (Wire Electrical Discharge Machining) is an effective method for machining micro gears. In this paper, aiming at WEDM characteristics, the gear design method is discussed. Based on gear meshing theory, the gear tooth profiles are generated. Mesh interference and wire path for WEDM algorithms are presented. Micro gear CAD/CAM software is developed whose functions include gear modeling, interference judgment and wire path generation. Finally a pair of micro gears is manufactured to verify the work in this paper. With the above method, the constraints on some gear parameters can be eliminated and the micro gear design is made more flexible.

scholarly journals Post-Processing and Surface Characterization of Additively Manufactured Stainless Steel 316L Lattice: Implications for BioMedical Use

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1376
Author(s):  
Alex Quok An Teo ◽  
Lina Yan ◽  
Akshay Chaudhari ◽  
Gavin Kane O’Neill
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Surface Characterization ◽  
High Surface ◽  
Surface Characteristics ◽  
Post Processing ◽  
Stainless Steel 316L ◽  
Processing Methods ◽  
Particulate Debris

Additive manufacturing of stainless steel is becoming increasingly accessible, allowing for the customisation of structure and surface characteristics; there is little guidance for the post-processing of these metals. We carried out this study to ascertain the effects of various combinations of post-processing methods on the surface of an additively manufactured stainless steel 316L lattice. We also characterized the nature of residual surface particles found after these processes via energy-dispersive X-ray spectroscopy. Finally, we measured the surface roughness of the post-processing lattices via digital microscopy. The native lattices had a predictably high surface roughness from partially molten particles. Sandblasting effectively removed this but damaged the surface, introducing a peel-off layer, as well as leaving surface residue from the glass beads used. The addition of either abrasive polishing or electropolishing removed the peel-off layer but introduced other surface deficiencies making it more susceptible to corrosion. Finally, when electropolishing was performed after the above processes, there was a significant reduction in residual surface particles. The constitution of the particulate debris as well as the lattice surface roughness following each post-processing method varied, with potential implications for clinical use. The work provides a good base for future development of post-processing methods for additively manufactured stainless steel.

Design of Midcourse Trajectory for Tactical Ballistic Missile Intercept on the Basis of Zero Effort Miss

2013 ◽  
Vol 397-400 ◽  
pp. 536-545
Author(s):  
Luo Gang Li ◽  
Wu Xing Jing ◽  
Chang Sheng Gao
Keyword(s):  
Relative Motion ◽  
Design Method ◽  
Ballistic Missile ◽  
Prediction Methods ◽  
Trajectory Design ◽  
Motion State ◽  
Simulating Calculation ◽  
Analytical Expressions ◽  
Maximal Principle ◽  
Computing Method

Since the maneuverability of the tactical ballistic missile, the midcourse trajectory of interception missile needs design online. Firstly, this paper reasonably simplifies the models and explores the analytical expressions of their relative motion state to obtain a kind of rapid and high-precision computing method of zero effort miss. Secondly, it applies constant thrust for the interception missile, burns out shut-down solid engine, reflects on the index requirement of overloaded interception missile, and designs midcourse trajectory of the interception missile with Pontryagin maximal principle, in accordance with the analytical expressions of zero effort miss. Finally, with the simulating calculation, the prediction methods of zero effort miss and trajectory design method provided by this paper are applied to a situation simulation which is close to the fact as much as possible so as to verify the applicability in the interception of tactical ballistic missile.

Research on Chamfer Software of Complex Parts

2013 ◽  
Vol 631-632 ◽  
pp. 1335-1341
Author(s):  
Shi Yong ◽  
Wen Tao Liu
Keyword(s):  
3D Model ◽  
Tool Path ◽  
Machining Parameters ◽  
Cad Cam ◽  
Programming Software ◽  
A Chain ◽  
Definition Of ◽  
Complex Parts ◽  
Cam Software ◽  
Location Point

In order to meet the needs of enterprises for chamfering complex parts, based on the customization of commercial CAD/CAM software, chamfer programming software is developed. According to user’s machining demands for a part, a chain of edges of a part is extracted from its 3D model. With preprocessing of the chain of edges, the continuity of the chain is estimated, and the start and end point of those edges are automatic obtained. Furthermore, with human-machine dialogue, machining parameters is set by users. By definition of the primary and secondary surfaces of the chain of edges, and interpolation of the edges, the positions of cutter location point and postures of cutter are calculated. Finally the interference of tool path is checked, and tool path is simulated. The software solves the programming problem of chamfering complex parts.

Virtual Reality Interface Using PDA for Street View Color Design

2005 ◽  
Vol 277-279 ◽  
pp. 318-323
Author(s):  
Yang Hee Nam
Keyword(s):  
Virtual Reality ◽  
Architectural Design ◽  
Virtual Reality Technology ◽  
Design Problems ◽  
Color Design ◽  
3D Space ◽  
Street View ◽  
Cad Cam ◽  
Realistic View ◽  
Cam Software

Architectural design is one of those areas that have actively employed interactive design tools such as CAD/CAM software. In order to add a realistic view of the design results in the 3D work process, there have been several recent attempts to employ a virtual reality technology that allows architects to explore design in 3D space. However, VR’s weakness is that common interaction tasks, such as navigation and selection, are still not supported conveniently in 3D space. In addition, VR devices are generally unfamiliar to the average person and are too expensive to use. This paper presents a VR framework that makes the design task easily achieved by employing a PDA interface for a VR interaction applied to street-view emotional color design problems.

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