RAPID PROTOTYPING

RAPID PROTOTYPING

ABSTRACT

In the development of new product, there is invariably need to produce a single prototype of a design part before the allocation of large amount of capital to new production system. The main reason for this need is that capital cost is so high and production tooling takes so much time to prepare; consequently, a working prototype is needed for troubleshooting and for design evolution, before a complicated system is ready to produced and marketed. A new technology, which considerably splits the iterative products development process, is the concept and practice of rapid prototyping. In advantages of R.P.: 1 Physical model of parts produced from CAD data files can be manufactured. 2.With suitable material, we can produce final parts. 3.RP operation can be used to produce toolings also.
R.P. process classified into three major groups 1. Subtractive, 2. Additive, & 3. Virtual. In this paper we are focusing on additive processes (built up a part by adding material incrementally).


INTRODUCTION

Though the principle of CE is quite clear and the advantages of the concept for improved quality and reduced cost are implicit, it is not possible to incorporate CE effectively in the absence of some technique for quick development of prototypes. To reduce the development time & adopt concurrent engineering in its true spirit, quick and inexpensive. Fabrication of prototype parts is essential and "rapid prototyping" (RP) technology has made that possible. By rapid prototyping process a solid object with prescribed shape, dimension & finish can be directly produced from the CAD based geometric model data stored in a computer without human interventions.

In all generative manufacturing process, the shape of the work piece is not obtained by removal of chips or forming, or casting. It is achieved by addition of material without any prior recognizable form or shape and the tool is necessary.
Types of generative manufacturing process:

A. Stereo lithography (SL) with photo polymerization
B. Fused deposition modeling (FDM)
C. Laminated object manufacturing (LOM)
D. Selective laser sintering (SLS)
E. Selective powder binding (SPB)
F. Programmable moulding
G. Building metallic objects by GMP