Xu, Anping, Hou, Hongye, Qu, Yunxia, and Gao, Yanping
Journal of Integrated Design & Process Science; Sep2005, Vol. 9 Issue 3, p15-27, 13p, 2 Color Photographs, 4 Diagrams
RAPID prototyping, INTERNET, COMPUTER systems, PROTOTYPES, and SINTERING
The part quality and cost are greatly affected by process parameters during rapid prototyping (RP). This paper proposes a Virtual Rapid Prototyping System (VRPS) and describes its functions, characteristics and realization method. Moreover, aimed at the Selective Laser Sintering (SLS) technology, an Internet-based virtual rapid prototyping system named VRPS-I is implemented using Java and Virtual Reality Modeling Language (VRML). The system resembles the physical fabrication system of SLS. With the aid of this system, not only can the visual rapid prototyping process be dynamically previewed, but the forming process and some part-quality-related parameters can also be predicted and evaluated. Therefore, the reasonable rapid prototyping parameters can be predetermined according to the simulated results without any physical RP machine. Hence, it can help optimize the prototyping process, improve part quality, enhance fabrication efficiency, and lower the model making cost significantly. [ABSTRACT FROM AUTHOR]
RAPID prototyping, PROTOTYPES, MANUFACTURING processes, TIME to market (New products), NEW product development, SINTERING, and LASERS
Traditional methods of creating new products are being challenged by the rise of 'rapid' techniques and technologies. A company wanting to engage in 'rapid manufacturing' now has a wide choice of machines, processes and technologies for getting its product ideas quickly into production. What many of these processes are essentially about is 'growing' parts out of minuscule pieces, as opposed to traditional manufacturing methods of machining, shaping or injection-moulding materials. Commonly, rapid manufacturing (also known as rapid prototyping) involves using laser technology to solidify or shape liquids or materials very precisely. [ABSTRACT FROM AUTHOR]
RAPID prototyping, MOLDING materials, SINTERING, PROTOTYPES, and MANUFACTURING processes
The article provides information on rapid prototyping (RP) which allows a mold builder to make a functional model to validate part design as well as function prior to the production of a mold. It states that the majority of RP involves the use of common prototyping processes, including selective laser sintering (SLS). It notes that typical costs per hour for SLS range from $55 to $75, depending on part complexity. Also discussed is the impact of the process on mold building.
Zhiqiang, Du, Zude, Zhou, Wu, Ai, and Youping, Chen
International Journal of Advanced Manufacturing Technology; May2007, Vol. 32 Issue 11/12, p1211-1217, 7p, 1 Color Photograph, 7 Diagrams, 6 Charts, 9 Graphs
SINTERING, SINTER (Metallurgy), LASER beams, RAPID prototyping, PROTOTYPES, MANUFACTURING processes, and POWER transmission
This paper presents a linear drive system that implements the high-accuracy reciprocating motion of the dynamic focus module in selective laser sintering (SLS) rapid prototyping manufacturing. The linear drive system consists of a moving-coil type PM linear DC motor (LDM), a DSP-based digital controller, a pulse-width modulated servo amplifier, and a linear optical encoder. The special configuration and dynamic model of the LDM are presented, the transfer function of the control system is derived, and a PID feedback controller including a low-pass filter with the derivative term and a model-based feedforward controller are designed. The present experiment proves that the tracking performance of the control system is satisfactory. The experimental results show that the linear drive system has fast dynamic response and acceptable tracking error in the driving dynamic focus module of SLS machines. [ABSTRACT FROM AUTHOR]
SINTERING, RAPID prototyping, PROTOTYPES, LASERS, and POLYMERS
Selective laser sintering (SLS) is one of the most rapidly growing rapid prototyping techniques (RPT). This is mainly due to its suitability to process almost any material: polymers, metals, ceramics (including foundry sand) and many types of composites. The material should be supplied as powder that may occasionally contain a sacrificial polymer binder that has to be removed (debinded) afterwards. The interaction between the laser beam and the powder material used in SLS is one of the dominant phenomena that defines the feasibility and quality of any SLS process. This paper surveys the current state of SLS in terms of materials and lasers. It describes investigations carried out experimentally and by numerical simulation in order to get insight into laser-material interaction and to control this interaction properly. [ABSTRACT FROM AUTHOR]
Presents a list of facts relating to the prototyping technique known as stereolithography. Increase in use of selective laser sintering; View of stereolithography enthusiasts who say that homeowners may someday construct their own kitchenware; Comments on stereolithography from Ron Barranco of stereolithography.com.
RAPID prototyping, PROTOTYPES, SINTERING, LASERS, and INDUSTRIAL design
The article focuses on the technologies and processes used in the rapid prototyping (RP) system and offers steps involved in selecting the right RP. It discusses the scanning laser autotype (SLA) systems and the Selective Laser Sintering process which are part of the RP systems. It is stated that while choosing the right RP system, it is important to select a reputable service provider which offers a breadth of RP solutions.
The article focuses on the strengths and weaknesses of the three rapid manufacturing techniques, namely, stereolithography (SLA), fused deposition modeling (FDM) and selective laser sintering (SLS). SLA can be used for prototyping automobile parts. Prototype parts can be built from high-performance engineering thermoplastics, namely, polycarbonate and polyphenylsulfone, by using FDM. SLS is suitable for direct manufacturing by using a plastic powder, comments the author.
POWDER metallurgy, SINTERING, LASER beams, METAL powders, ERRORS, and PROTOTYPES
The article presents information on the misconceptions of direct metal laser sintering (DMLS). It notes that the DMLS uses a focused laser beam to melt and fuse the metal powders into a solid part in 20 micron layers. It mentions several misconceptions on the technology including its use which is for prototyping and not manufacturing, the parts of the DMLS are not as strong as the traditional metal parts, and that it is expensive compared to machining or casing.