Computer Integrated Design and Manufacture of Complex Geometries in Concurrent Engineering

1993 ◽  
pp. 559-564
Author(s):  
B. Gopalakrishnan ◽  
V. Pandiarajan
Keyword(s):  
Concurrent Engineering ◽  
Integrated Design ◽  
Complex Geometries ◽  
Design And Manufacture

Concurrent Engineering of Toothed Bodies for Generalized Function Transmission

1998 ◽  
Author(s):  
David B. Dooner ◽  
Ali A. Seireg
Keyword(s):  
Concurrent Engineering ◽  
Integrated Design ◽  
Transmission Function ◽  
Generalized Function ◽  
Interactive Software ◽  
Functional Requirements ◽  
Design And Manufacturing ◽  
Kinematic Geometry ◽  
Different Types ◽  
Design And Manufacture

Abstract This paper presents a novel interactive computerized approach for the integrated design and manufacture of different types of toothed bodies based on mathematical derivations from theories of kinematic geometry. An important feature of the developed methodology is that the design and manufacturing data for the toothed bodies which satisfy specified functional requirements and the corresponding cutters used to produce them are synthesized concurrently. The procedure is applicable to any case of conventional or non-conventional gearing as well as transmission function and is particularly useful for the design and manufacture of skew axis gearing. An example of a hypoidal gear pair and the cutters used to produce them are presented to illustrate features of the developed methodology and interactive software.

Spline Based Design of Cam Contours for Improved Dynamic Performance

1993 ◽  
Author(s):  
Holly K. Ault ◽  
James C. Wilkinson
Keyword(s):  
Dynamic Performance ◽  
Integrated Design ◽  
Polynomial Functions ◽  
Piecewise Polynomial ◽  
Cam Design ◽  
Piecewise Polynomial Functions ◽  
Cam Follower ◽  
Cam Profile ◽  
Pitch Curve ◽  
Design And Manufacture

Abstract A method for the integrated design and manufacture of radial plate cams is discussed. Currently, a cam-follower system is designed by specifying constraints on the motion of the follower. The physical cam contour or cam pitch curve are not mathematically defined. The cam is manufactured from the discretized follower motion program. A new method for cam design is proposed which will produce a smooth, mathematically defined cam pitch curve while maintaining the proper constraints on the follower motion. Piecewise polynomial functions in the form of rational and/or non-rational splines may be used. Cams will be manufactured using smoothed profiles and tested for improved dynamic performance. The results of initial investigations of cam profile design for this research are presented.

scholarly journals Design and manufacture of hybrid metal composite structures using functional tooling made by additive manufacturing

2019 ◽  
Vol 5 ◽  
Author(s):  
Daniel-Alexander Türk ◽  
Fabian Rüegg ◽  
Manuel Biedermann ◽  
Mirko Meboldt
Keyword(s):  
Additive Manufacturing ◽  
Composite Structures ◽  
Selective Laser Sintering ◽  
Integrated Design ◽  
Material Structure ◽  
Metal Composite ◽  
Interface Elements ◽  
Manufacturing Technique ◽  
Reference Design ◽  
Design And Manufacture

This paper presents a novel manufacturing technique for complex-shaped, hybrid metal composite structures leveraging the design freedom of additive manufacturing (AM). The key novelty of this research is an approach for an autoclave-suitable and removable tooling, which consists of a 3D-printed functional shell and a structural filler material. In this process, a layup shell is produced with AM and filled with a temperature-resistant curing support to form a removable inner tooling. The functional shell has integrated design features for the positioning and the fixation of metallic interface elements and is removed after curing through integrated breaking lines. The feasibility of this manufacturing technique is demonstrated by fabricating a novel lightweight structure for the hydraulic quadruped (HyQ) robot. Selective laser sintering (SLS) was used to produce the functional shell tooling. Titanium interface elements made via selective laser melting (SLM) were assembled to the shell and co-cured to carbon fiber using an autoclave prepreg process. The resulting multi-material structure was tested in ultimate strength and successfully operated on the HyQ robot. Weight savings of 55% compared to a reference design and the mechanical viability of the multi-material structure indicate that the proposed manufacturing technique is appropriate for individualized hybrid composite structures with complex geometries.

Computer-Integrated Design and Manufacturing of Packaging Machines

2005 ◽  
Author(s):  
Scott E. Buske ◽  
Tien-I Liu
Keyword(s):  
Knowledge Base ◽  
Integrated Design ◽  
Base System ◽  
Design Standards ◽  
User Input ◽  
Tool Paths ◽  
Warning Messages ◽  
Knowledge Base System ◽  
The Cost ◽  
Design And Manufacture

Automated packaging machines must be constantly redesigned to accommodate ever changing packing. There is little time to make these changes and no room for error. In this work, computer-integrated design and manufacture of a packaging machine has been conducted. A knowledge base system has been developed, which checks for errors in user input, updates all assemblies per the user input, checks for part interferences in the assembly, holds the new design to accepted design standards, and sends warning messages to the user’s computer screen in the event of a problem. The knowledge base then creates new intelligent part numbers. These part numbers provide the informational link from Engineering to Production as they contain all the new part information needed to make the parts. These part numbers are entered into a program that automatically creates the new tool paths for the CNC mill. The entered part number is automatically milled into the part to insure the correct part was entered. The cost of design and manufacture is then reduced substantially. This knowledge base also extends into sales for quoting and for new job creation which expedites the entire process.

Fast CE™ — A Radical Approach to Concurrent Engineering

1998 ◽  
Author(s):  
Dennis E. Barbeau
Keyword(s):  
Concurrent Engineering ◽  
Unit Cost ◽  
Integrated Design ◽  
Historical Background ◽  
Fast Time ◽  
Full Potential ◽  
Full Spectrum ◽  
Early Date ◽  
Functional Product ◽  
The Status

This paper describes the status and potential for a fast time-to-market concurrent engineering process. The principles have been developed by the author over a 25 year learning process and used effectively on a variety of programs. Fast CE™ is fundamentally predicated on integration of the manufacturing and engineering processes at the conceptual design phase. Commencement at this early date is critical — 80 to 90% of the inherent production unit cost is locked in place during this process. Subsequent to development of an integrated design strategy, both producibility and functional product development evolve in parallel using a “model-centric” approach to maintain the integrity of all elements of the program. Fast CE™ not only eliminates the use of drawings, it requires that they not be used in any capacity except as a convenience reference. This provides tight control over a common data base that directly links all of the activities necessary to design and produce a product. The result is a significant reduction in cost and schedule, with gains in all of the processes required to bring a product to market. Drawing elimination in itself can amount to a savings of as much as one third of the total design cost. The activities previously supported by drawings — quality assurance, for example — are managed through simpler, more functionally oriented processes. The author describes the elements of Fast CE™ and the radical changes required in certain areas. Historical background traces development of the processes, providing perspective on the strategies and the issues faced and overcome, and leading to the issues currently faced in attainment of its full potential. The cost and schedule gains identified require cultural as well as operational changes. The more radical of these changes present a management challenge to any organization intent on gaining the full spectrum of benefits.

Computer-Aided Monte Carlo Aircraft Tolerance Design Based on UG

2011 ◽  
Vol 338 ◽  
pp. 300-303
Author(s):  
Chang Hong Guo ◽  
Ping Xi ◽  
Zhen Yu Wang ◽  
Xing Dong Li
Keyword(s):  
Monte Carlo ◽  
Three Dimensional ◽  
Integrated Design ◽  
Tolerance Analysis ◽  
Digital Design ◽  
Tolerance Design ◽  
Computer Aided ◽  
Design And Manufacture

Along with the CAD technology being popularized, three-dimensional design of aircraft is ultimately realized into digital design. However, aircraft tolerances have not been designed by computer. They are mainly based on lots of manual calculations and not coordinated with integrated design and hold back the development of aircraft digital design and manufacture technologies. This paper introduces how to develop computer-aided aircraft tolerance analysis and distribution modules on UG and introduces Monte Carlo tolerance analysis technology. Running instances of aircraft tolerance design are illustrated in the paper.

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