Selective laser sintering advantages and disadvantages pdf

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selective laser sintering advantages and disadvantages pdf

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Since most starting materials for tissue engineering are in powder form, using powder-based additive manufacturing methods is attractive and practical. The principal point of employing additive manufacturing AM systems is to fabricate parts with arbitrary geometrical complexity with relatively minimal tooling cost and time. Selective laser sintering SLS and inkjet 3D printing 3DP are two powerful and versatile AM techniques which are applicable to powder-based material systems. Hence, the latest state of knowledge available on the use of AM powder-based techniques in tissue engineering and their effect on mechanical and biological properties of fabricated tissues and scaffolds must be updated.

What are the Advantages and Disadvantages of 3D Printing?

To browse Academia. Skip to main content. By using our site, you agree to our collection of information through the use of cookies. To learn more, view our Privacy Policy. Log In Sign Up. Download Free PDF. Mithun V Kulkarni. Rajesh Rangappa. Download PDF. A short summary of this paper. All the conventional manufacturing processes. The Additive [].

There are a variety of layer manufacturing manufacturing method can produce fully techniques available today, especially for metal dense metal parts in a short time, with higher prototyping techniques SLS, inkjet 3D printing precision. It is the most promising additive solidifying powder like materials layer-by-layer, manufacturing technology that can be used exposing the surface of a powder bed with a laser for manufacturing smaller and medium or other high energy beam. The laser sintering volume, simpler or complex metal parts.

This process is characterised by extreme rapid review presents evolution, current status and sintering and solidification. The area of interest challenges of the SLS Technique. The article in this paper is all about SLS. The SLS technique presented emphasises on metal material has a great future potential for the rapid processed by SLS technique.

It also talks manufacturing of metal components that could about the SLS Technique in terms of be utilized in a variety of applications. DMLS uses single component metal powders. Powders are usually produced by ball milling Keywords- Additive Manufacturing, technique and by other methods such as fluidized Aerospace Materials, Direct Metal laser beds, blades, brushes, etc. The schematic diagram of SLS system is as shown in the Fig.

Figure 2 : Model of the standard material cell Figure 1. Schematic of the laser sintering process [6]. Initially sintering techniques is that, the designer designs at the starting stage where the powders are a part, next the part is sliced on the horizontal arranged one above the other and through the plane by using the required software.

A chamber laser activity powder starts to wet, then in the production machine is filled with powder. Layer after thing, with SLS used to refer to the process as layer is built up from bottom to top, until the part applied to a variety of materials—plastics, glass, is finished. The leftover powder is re-usable, ceramics—whereas DMLS refers to the process leaving no waste. The term SLS is used often to describe a The method of production of laser number of laser-forming processes.

SLS is sintered parts depends on a laser sintering b sometime distinguished from SLM because of hatch pattern c post processing d material the difference between the two solidification type and the machine used for fabricating of the methods in terms of bonding mechanisms, laser- parts.

The following sections provide an melting related to fully melting the powdered understanding of the above listed points. Pre-processing to liquefying only the surface of the powder The deposition of powders and the particles for bonding the particles to each other. For better sintering of powdered [7]. Ordinary particles produce porous layers of high density, appropriate size and appropriate composition. This can be achieved by optimizing the particle shape and surface, prior to optimizing the performance and the SLS process, the powder sintering ability must be improved by selecting proper process parameters viz.

Table 1 describes about the process 1. SLS can produce complex Table 1: Process parameters of SLS divided into, shaped metal components with a part density material, laser, scan and Environmental parameters. Material Laser Scan Environment This is the fractional density at which porosity typically changes from interconnected or Composition Mode Scan Preheating speed surface-connected to closed.

The powder in the Powder Wave Hatching Pressure interior of each layer cross-section can be density length space optionally laser sintered to an intermediate Morphology Power Layer Gas type density typically exceeding 80 percent of the thickness theoretical density.

Use of the Flow Spot size Scaling properties factors compound fabrication method, conceived as a rapid, low-cost replacement for conventional 1. The microstructure and mechanical For building part layer by layer choice for properties of hybrid fabrication SLS processed selecting a path for laser movement lies in the and hot isostatically pressed post-processed selection of the hatch pattern, the default value of material correlate well with those of the hatch pattern in the DMLS EOS machine is conventionally processed material [10].

There are agreeable to processing to full density. The four choices for hatch pattern selection and they maximum density achieved in multi-layer are along x, y, both in x-y or alternating in x-y as samples, using pulsed Nd: YAG processing was shown in Fig.

Much lower densities were along the x axis and Fig. If both x and y options are selected processing operating in the same continuous then there will be double exposure on the layer, melting regimes []. The laser sintering once along x and then along y as shown in Fig.

In alternating in x-y choice, direction of sintering and solidification. Due to the layer wise scanning is changed for alternating layers Fig. Different hatch patterns or scanning mechanical properties [10]. Currently there are two manufacturers of strategies [9].

New grades of nylon powders i. Duraform PA12, Fine Polyamide, PA even yield a resolution and surface roughness close to steel those of polycarbonate, making PA also suited for casting silicone rubber and epoxy moulds. Other polymer-based materials available VAC, Recently, Windform XT is introduced into the commercial market, which is based on a carbon-filled PA and produces black parts with a smooth finish and a sparkling appearance.

Titanium, Inconel, stainless steel, cobalt chrome and aluminum are all metals that 2 LaserForm A6 can be built up, layer by layer, with this 3D printing technology. Laserform A6 is polymer binder to exhibit stronger mechanical properties than coated steel powder.

During part building cast parts in the near future. Researchers have process the binder is sintered. The resulting part confirmed that when evaluating a part cut from a is exposed for a period of 24h, where the binder solid chunk of metal to a cast part, the cast part is burnt off and bronze is infiltrated into the part.

Some of the metal by any one of the technique like machining, materials used by DMLS processing techniques EDM processing, polishing, etching, texturing, have been high lightened in the ensuing sections. LaserForm A6 material is magnetic and can Interested readers may kindly go through the be fixtured using magnetic chucks.

SLS with references for details regarding physical LaserForm A6 provides benefits in the rapid and mechanical properties. The surface can be coated for even 10 Inco and higher surface hardness. That steel has Laser Form ST, Characteristics similar to found application in the production of screws C35 tool steel is a metal material developed supporting a broken bone, bone plates, complete exclusively for SLS systems, this material is sets for prosthetic use, wires for dental excellent for creating functional, durable metal prosthetics, as well as in the manufacture of all prototypes, and tooling inserts directly from kinds of medical instruments [21].

Stainless steel CAD files, without any costly time-consuming is used for jewellery and watches with L casting, CNC programming or extensive being the type commonly used for such machining. Tool inserts made with Laser Form applications where it can be re-surfaced and will ST material are so reliable that they can not oxidize or turn black, the lower carbon mould over , plastic parts, depending on content in L minimizes injurious carbide the moulding material.

Laser Form ST precipitation as a result of welding. It finds its application in applications requiring high hardness, strength durable prototype tooling inserts, bridge tooling, and corrosion resistance [26].

It can Cobalt Chrome is a cobalt-chrome also be used for developing prototypes with molybdenum-based super alloy powder which complex geometries and features [24].

Cobalt Chrome has steel is a specialty stainless steel composite excellent corrosion resistance and is more developed for SLS systems to produce durable, favoured for medical and dental prototypes [26]. LaserForm ST- material is ideal for both One of the materials suitable for manufacturing prototype and production applications. The produced with LaserForm ST material have material has excellent strength combined with high thermal conductivity, thus it can be used in high toughness.

The material finds its use in cycle times by serving as an improved conformal high-temperature applications, short runs of cooling application. Parts made from Maraging metal parts and prototypes and metal tooling Steel can be easily machined and can also be inserts for complex geometries and features.

The material is tungsten—molybdenum series. The carbides in it characterised by having a very good corrosion are short and uniformly distributed. It has high resistance and mechanical properties, especially wear resistance. Due to its comparatively low admirable ductility, and is extensively used in a carbon content, M2 has excellent strength variety of engineering applications.

Parts combined with toughness properties and produced from EOS Stainless Steel by abrasion resistance when properly hardened and laser-sintering can be welded, machined, micro tempered. M2 finds its application in shot-peened, polished and can even be coated if manufacturing a variety of tools, such as drill required. Unexposed powder can be reused. While it has good thermal products or spare parts [26]. It is used corrosion resistance and mechanical properties, for parts which subject to high loads.

Parts made specifically in the precipitation hardened state. In has realized users to and DMLS have made an impression especially think about rapid manufacturing as a production in the areas of, consumer products, automotive, process. Machining IN is tough and nobody aerospace, athletic footwear equipment, and likes to do it, whereas, the DMLS process allows motor sport industries and many more.

This material is ideal for many high aerospace applications is the titanium alloy Ti- temperature applications industries like power 6Al-4V. The use of the investment casting and process industry gas turbine parts, process with the SLS process to quickly produce instrumentation parts, etc. DMLS IN also wax patterns allows for the rapid prototyping of possesses excellent cryogenic properties and parts which would normally take months to potential for cryogenic applications.

EOS nickel produce. In the transportation industry, wax alloy IN parts can be easily post-hardened to patterns are utilized to quickly produce HRC HB by precipitation- functional metal prototypes for use on the engine hardening heat treatments. Nickel alloy IN in or drive train. These pieces would be about time both as-built and age hardened states the parts consuming to prototype via traditional methods.

It has excellent cast in the alloy of choice [33]. Typical applications includes: engineering scaffolds, drug delivery devices, and Aero and land based turbine engine parts, rocket bone models. SLS allows the original material.

This is completely SLS is also a popular method for 3D printing eliminated with DMLS titanium, by using customized products, such as hearing aids, dental DMLS technique material wastage is reduced, retainers and prosthetics. Ti-based alloys are also in relation with traditional processes shows widely used for manufacturing orthopaedic and a sign of rapid manufacturing [30].

Introduction to SLS 3D printing

The purpose of this paper is to describe the basics of selective laser sintering SLS and also the benefits of designing parts to be built using this technology. Some design requirements are also included. This paper was written to assist design engineers in using the SLS technology as opposed to traditional manufacturing technologies. The findings of the paper are primarily limited to the differences of the functionality of products designed for manufacture using traditional technologies as compared to the ability to design for perfect functionality and the parts are able to be manufactured using SLS. The paper shows that any application where light weight, maximum performance or the ability to customize is the prime consideration is a candidate for the many benefits afforded by SLS and the related technologies. Butler, J.

Stereolithography SLA comes as a distant second. Identifying which technology comes third is far from definite, but a strong case could be made for Selective Laser Sintering SLS. What is SLS and how does it work? Does SLS have the potential to be the next big thing in the world of 3D printing? SLS refers to selective laser sintering, which was developed in the mids by Dr.

Selective laser sintering

The demand is growing due to some of the revolutionary benefits that it can provide. Like almost all technologies it has its own drawbacks that need considering. This page aims to help with the selection process. We will cover each of the advantages and disadvantages of 3D printing.

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Selective laser sintering SLS is an additive manufacturing AM technique that uses a laser as the power source to sinter powdered material typically nylon or polyamide , aiming the laser automatically at points in space defined by a 3D model , binding the material together to create a solid structure. It is similar to selective laser melting ; the two are instantiations of the same concept but differ in technical details. SLS as well as the other mentioned AM techniques is a relatively new technology that so far has mainly been used for rapid prototyping and for low-volume production of component parts. Production roles are expanding as the commercialization of AM technology improves.

About SLS , Knowledge 0 comments. It uses thermoplastic materials, typically in the form of spools of filaments.

Get Further Advice On 3D Printing

Stereolithography SLA comes as a distant second. Identifying which technology comes third is far from definite, but a strong case could be made for Selective Laser Sintering SLS. What is SLS and how does it work? Does SLS have the potential to be the next big thing in the world of 3D printing? SLS refers to selective laser sintering, which was developed in the mids by Dr.

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