A dynamic feature–based operation planning method for 2.5-axis numerical control machining of complex structural parts

2015 ◽  
Vol 229 (7) ◽  
pp. 1206-1220 ◽  
Author(s):  
Xu Liu ◽  
Yingguang Li ◽  
Limin Tang
Keyword(s):  
Planning Method ◽  
Numerical Control ◽  
Dynamic Feature ◽  
Operation Planning ◽  
Numerical Control Machining ◽  
Feature Based ◽  
Complex Structural ◽  
Structural Parts ◽  
Complex Structural Parts

An Approach to Region-Based Feature Recognition for Structural Parts

2012 ◽  
Vol 482-484 ◽  
pp. 2114-2117
Author(s):  
Li Hong Qiao ◽  
Jian Feng Wu
Keyword(s):  
Process Planning ◽  
Feature Recognition ◽  
Numerical Control ◽  
Directional Characteristic ◽  
Structural Part ◽  
Feature Based ◽  
Complex Structural ◽  
Structural Parts ◽  
Complex Structural Parts

Feature-based numerical control programming can enhance the process planning efficiency for complex structural parts in aeronautic industry. Feature recognition is often being a useful tool to the domain. In order to handle the variety and uncertainty of the feature interpretation of feature recognition of structural parts, a region-based feature recognition approach is proposed. On the basis of the characteristics of the structural parts, the approach employs the fact that topology surfaces of structural parts have directions, and utilizes region as the foundation of feature recognition. By recognition and combination of regions, the approach acquires the features of a structural part. The approach is efficient in recognizing the features of structural parts which have apparent directional characteristic.

A sequence planning method for five-axis hybrid manufacturing of complex structural parts

2019 ◽  
Vol 234 (3) ◽  
pp. 421-430
Author(s):  
Changqing Liu ◽  
Yingguang Li ◽  
Sen Jiang ◽  
Zhongyu Li ◽  
Ke Xu
Keyword(s):  
High Precision ◽  
Planning Method ◽  
Hybrid Manufacturing ◽  
Sequence Planning ◽  
Tool Accessibility ◽  
Complex Structural ◽  
Structural Parts ◽  
Five Axis ◽  
Printing Direction ◽  
Complex Structural Parts

The concept of additive–subtractive hybrid manufacturing provides a new idea for the manufacturing of high-precision complex structural parts. Currently, under the five-axis additive–subtractive hybrid manufacturing mode, existing research work concerned with sequence planning issues have limitations. This article presents a sequence planning method for hybrid manufacturing of complex structural parts with high precision. The initial printing direction of parts was determined based on an iterative search method and the initial hybrid manufacturing sequence was constructed by part volume decomposition, which solved the coupling problem of printing direction decision and machinability calculation. Under the constraint of tool accessibility, the whole planning of the hybrid manufacturing sequence was realized based on greedy algorithm. This method has achieved highly effective planning of the alternative sequence in the process of hybrid manufacturing, thus greatly reduced the number of tool changes required and laid a foundation for the realization of highly efficient hybrid manufacturing.

One Step Production of High-performance Sandwich Components

2017 ◽  
Vol 36 (3) ◽  
pp. 135-150 ◽  
Author(s):  
Ch. Hopmann ◽  
R. Wagner ◽  
K. Fischer ◽  
A. Böttcher
Keyword(s):  
High Performance ◽  
Foam Core ◽  
Continuous Fiber ◽  
Production Processes ◽  
Pressing Process ◽  
Wet Pressing ◽  
One Step ◽  
Complex Structural ◽  
Structural Parts ◽  
Complex Structural Parts

The combined PU spray and wet pressing process allows the manufacture of parts with high lightweight potential. The process can be used for the production of sandwich parts with compact continuous fiber reinforced PU outer layers and a process integrated formation of the foam core. Compared with established production processes for structural sandwich parts, the integration of the foam core formation in a wet pressing process is highly efficient and economical especially for complex structural parts.

A Cloud Manufacturing Architecture for Complex Parts Machining

2015 ◽  
Vol 137 (6) ◽  
Author(s):  
Xu Liu ◽  
Yingguang Li ◽  
Lihui Wang
Keyword(s):  
Cloud Manufacturing ◽  
Dynamic Feature ◽  
Structural Part ◽  
Large Size ◽  
User Request ◽  
Matching Efficiency ◽  
Complex Structural ◽  
Structural Parts ◽  
Machining Operations ◽  
Complex Parts

Service provider (SP) know-hows are essential in machining service (MS) encapsulation in the cloud. However, since the acquisition of the know-hows for complex parts machining requires investing considerable manpower and resources in R&D, this kind of machining know-hows is usually considered as one of the core competences of the SP who makes them unshareable. Targeting the problem, this paper presents a new cloud manufacturing (CM) architecture in which MSs are encapsulated within each SP with standardized machining task description strategies (SMTDS). Only the capability information about what the SP can do is provided to the cloud. During service matching, SMTDS is also applied for user request formulation to improve the matching efficiency and quality. For complex parts in large size, high machining requirements, high value, short delivery cycle, and complex structures, e.g., aircraft structural parts, unacceptable machining quality or delivery delay may cause a much greater loss not only in economy. In the proposed CM architecture, to guarantee the feasibility of the MSs for complex structural parts, machining operations for the user preferred services could be generated by mapping the corresponding typical machining plans (TMP) to the part based on the dynamic feature concept to support accurate evaluations of the MSs. The machining of an aircraft structural part is then applied as a test user request to demonstrate how the proposed method works for finding MS for complex parts.

Recycled Carbon Fibers in Complex Structural Parts - Organic Sheets Made of rCF Staple Fiber Yarns

2017 ◽  
Vol 742 ◽  
pp. 602-609 ◽  
Author(s):  
Christian Goergen ◽  
Stephan Baz ◽  
Peter Mitschang ◽  
Götz T. Gresser
Keyword(s):  
Carbon Fibers ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Staple Fiber ◽  
Reinforced Polymer ◽  
Fiber Reinforced Polymer Composites ◽  
Complex Structural ◽  
Thermoforming Process ◽  
Structural Parts ◽  
Complex Structural Parts

In order to sustainably establish carbon fiber reinforced polymer composites (CFRPC) in the market on an industry scale, solutions on how to recycle these new materials have to be developed. Quasi-continuously aligned carbon staple fiber structures in organic sheets made of recycled carbon are one approach which will be dealt with in this article. The process chain as well as the mechanical properties will be presented. Moreover, the specific feature of staple fiber yarns to be able to plastically deform under process temperature, enabling new degrees of deep-drawing of CFRPC organic sheets in the thermoforming process, will be highlighted.

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