Innovative Production Machines and Systems Conference - Innovative and Intelligent Design Technologies

A framework for novel descriptive product design methodology

smekwn — Mon, 05 Nov 2007 15:51:41 +0000

Prescriptive design methodologies dictate how designers should carry out their design work while normative methodologies affect the way in which they make decisions. Empirical studies have found that designers rarely apply current prescriptive and normative design methodologies in their work. These methodologies do not support them in designing based on their individual preferences and approaches. Most descriptive design methodologies, such as protocol analysis, are applied for the purpose of investigating and analysing the design process. This paper describes a novel structured descriptive de

Generation of CAD Surfaces by using Cubic Spline Curves

kawan — Fri, 22 Jun 2007 14:17:48 +0100

The latest computation techniques made it possible to simulate complex sculptured surfaces for CAD/CAM applications. The design of mechanical components are becoming more and more complex with the advancement in the speed and the power of computers.
In this research work a cubic spline curve generation algorithm is developed and implemented in a CAD system called Design and Manufacture of Complex Surfaces (DMCS). The technique generates cubic spline curves and these curves are integrated to generate complex surfaces. The cubic spline interpolation technique is developed for CAD applications which require exact shape of the objects. The surfaces produced have enough geometrical information like position, tangent/normal, and curvature so that they may be used in CAM applications. The system is capable of generating and editing the complex surfaces and then producing manufacturing information in CAM package. In this paper complete mathematical algorithm for the cubic spline interpolation technique is given. The working of the DMCS system is also presented by using a case study.

Closed loop of material, manufacturing and design to get a fit product

Schäfer — Fri, 22 Jun 2007 14:17:48 +0100

Metallic and composite structures have a wide application range in mechanical and process engineering. The use of
an advanced material design needs a detailed knowledge of the material properties. The knowledge has to be applied
at the very beginning of the design process. The design process is a multidiscipline challenge between material
science, design methodology and manufacturing, which can only be solved by concurrent engineering.
The necessary knowledge of accessible material properties, with regard to the manufacturing process, might be
available by different databases, such as internal information, material supplier or public in the web from current

Modelling and Simulation of Manufacturing Systems in Different Life Cycle Phases

Juhani Heilala — Fri, 22 Jun 2007 14:17:47 +0100

This article presents needs and solutions to enhance use of modelling and simulation in manufacturing system life cycle phases, from concept creation, to design and operations. The challenges in manufacturing system design using discrete event simulation are shown. Simulation models are usually used for system design evaluation, in the analysis of the system concepts and in the testing of system specification with virtual, digital system. Rarely the simulation model are used in the system operation planning phase as decision support tool for the production managers, even if benefits of the method are known.

Application of design -for- manufacture (DFM) rules in CAD/CAM

Szecsi — Fri, 22 Jun 2007 14:17:46 +0100

In the paper, Design-for-Manufacture (DFM) Rules, Design Functionality (DF) Rules, Design for Assembly (DFA) Rules, Recommended Tolerance and Expected surface finish values are described. The rules will be included in commercial CAD/CAM packages as a tool. The rules are organised in a hieratical rules system and the designers can select the design rules from a manufacturing rules library. The designers can ensure that no design rules are violated, accurate tolerances and surface finish values are implemented during the design phase.

The role of simulation tools to innovate the prosthesis socket design process

federico_rotini — Fri, 22 Jun 2007 14:17:46 +0100

The products having a tight interaction with the human body require an high level of customization in order to fulfill comfort, usability and wearibility requirements. The prosthesis socket for lower amputees is an example of this kind of products. At present, the manufacture of a socket is almost an hand made activity performed by skilled orthopaedic technicians. With the aim to speed-up the design process and obtain more comfortable products, a computer design methodology to assist the design of such a kind of custom-fit goods is under investigation within t he framework of an Italian Research Project called DESPRO. In the paper the role of the simulation tools within the methodology under development is presented according to the design tasks. The application of the FEM and explicit solution strategies to simulate the biomechanical interaction between the socket and the stump of the patient is described. The use of shape optimization tools to speed-up the socket design process, is also, investigated and discussed. Some preliminary results of the suggested approach are introduced.

Computer design and simulation of the sprue system

yuli toshev — Fri, 22 Jun 2007 14:17:46 +0100

3D CAD models were developed for investigation of the influence of the sprue system geometry on the process of optical disc moulding using computer simulation. The main purpose of the present work is to develop models that allow easy change of the geometry shape and dimensions of the sprue system. The 3D CAD model of the sprue system was built as a combination of the polymer substrate and the sprue system, considered as one object. This approach allows achieving a precise design of the sprue system, before to import the 3D CAD model in the computer simulation software. By means of simulation software the proposed 3D models were verified. Three different variants of the sprue system design were defined and two parameters were chosen as variables: D1 (the gate length), D2 (the gate depth). By means of iterative steps in the frame of the mould filling simulation, an optimal variant for the gate geometry and for the processing parameters was obtained.