Micro-mould fabrication for a micro-gear via vacuum casting

Tang, Yew Chung; Tan, Wei; Fuh, Jerry Ying Hsi; Loh, Han Tong; Wong, Yin Kwan; Thian, S. C. H.; Lü, Lin

doi:10.1016/j.jmatprotec.2007.04.098

Cited by 74 publications

(41 citation statements)

References 11 publications

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“…Silicone moulding (SM) is an established prototyping technique widely used in industry to produce wax patterns [10,11] and various types of plastic parts due to high chemical resistance of silicone rubber and low interfacial energy of its surface. SM is a characterized by the use of a vacuum during the process of mould fabrication and the casting of plastic parts [12]. In SM process, initially, a master pattern using any of the RP technology has been fabricated.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations for dimensional accuracy and surface finish of polyurethane prototypes fabricated by indirect rapid tooling: a case study

Singh

Singh²,

Singh³

2017

Prog Addit Manuf

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In this research work, an effort has been made to study the influence of selected input parameters on the dimensional accuracy (linear as well as radial) and surface finish of polyurethane prototypes fabricated by vacuum casting (VC) process as a case study. The master pattern required for making a silicone mould has been fabricated by fused deposition modelling and its surface finish has been enhanced by chemical vapour smoothing process. Maximum shrinkage of 2.29 and 4.77% has been observed in the selected linear and radial dimension, respectively, after the VC process. Optimal parameter settings that were different for both the dimensions as well as surface finish have been obtained using Taguchi's L18 orthogonal array. Finally, parameter setting that simultaneously minimizes the dimensional deviation and surface roughness has been found out using response optimization module of Minitab 17 software and the results obtained have been verified by performing the confirmation experiments. The tolerance grades for the selected dimension of the prototypes were found to be acceptable as per the ISO standard UNI EN 20286-I (1995) and DIN16901 for plastic materials. In addition, the C pk value greater than 1.3 indicated that the proposed process is highly capable. The surface finish and dimensional accuracy of prototypes are at par with the traditional moulding patterns, and hence, they can be used as end-products or plastic-based master patterns for investment casting applications.

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Section: Introductionmentioning

confidence: 99%

Experimental investigations for dimensional accuracy and surface finish of polyurethane prototypes fabricated by indirect rapid tooling: a case study

Singh

Singh²,

Singh³

2017

Prog Addit Manuf

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show abstract

“…Vacuum casting is a suitable process as it was proven to be capable of consistently producing micro-parts that are dimensionally accurate with respect to the master pattern (Tang et al, 2007). PU and epoxy were selected in this study due to their good mechanical properties as well as the polymer being non-toxic.…”

Section: Vacuum Casting For Mass Productionmentioning

confidence: 99%

Micro-spike EEG electrode and the vacuum-casting technology for mass production

Seet

Lee

et al. 2009

Journal of Materials Processing Technology

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“…A commercially available automatic vacuum machine was widely employed to degas in the manufacturing of silicone-rubber molds, but the hardware is costly. 10 In addition, the programmable logic controller mode lacks the flexibility to modify the program. Hence, developing a low-cost and easy-to-operate automated de-bubbling system is a major concern.…”

Section: Introductionmentioning

confidence: 99%

A high-efficiency automatic de-bubbling system for liquid silicone rubber

Kuo¹,

Huang²

2016

Mater. Tehnol.

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The silicone-rubber mold is regarded as an important method for reducing the cost and time to market a new product by shortening the development phase. A commercial, automatic, vacuum machine is widely used to degas in the manufacturing of a silicone-rubber mold, but the hardware is costly. A low-cost, high-efficiency degassing system was designed and implemented from a regular vacuum machine. The control style was based on a human-machine interface. It was found that the whole degassing-process sequences consist of the explosive phase, the balanced phase and the convergence phase. The time saving in the degassing process can be at least 42 %. Six predicted equations for both the balanced phase and the convergence phase are investigated and the maximum relative error of these equations can be controlled to within 6.34 %. The advantages of the developed de-bubbling system include saving labor, reducing the human error of the operator and a higher degassing efficiency. Keywords: air bubbles, de-bubbling, silicone rubber mold, rapid tooling Forma iz silikonske gume je pomembna pri zmanj{evanju stro{kov in skraj{anju~asa razvojne faze pri uvajanja novega izdelka na trg. Pri izdelavi forme iz silikonske gume se za razplinjevanje uporabljajo drage komercialne vakuumske avtomatske naprave. Iz obi~ajne vakuumske naprave je bil izdelan poceni in u~inkovit razplinjevalni sistem. Kontrola stroja temelji na povezavĩ lovek-naprava. Ugotovljeno je, da razplinjevanje sestoji iz eksplozivne faze, faze uravnote`enja in iz faze konvergence, Postopek razplinjevanja omogo~a 42 % prihranek~asa. Preiskanih je bilo {est predvidenih ena~b pri obeh uravnote`enih fazah in pri konvergen~ni fazi in maksimalna napaka zna{a 6,34 %. Prednosti razvitega sistema razplinjevanja so: prihranek dela, zmanj{anje~love{kih napak operaterja in ve~ja u~inkovitost razplinjevanja. Klju~ne besede: zra~ni mehur~ki, odprava mehur~kov, forma iz silikonske gume, hitra izdelava orodij

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Micro-mould fabrication for a micro-gear via vacuum casting

Cited by 74 publications

References 11 publications

Experimental investigations for dimensional accuracy and surface finish of polyurethane prototypes fabricated by indirect rapid tooling: a case study

Experimental investigations for dimensional accuracy and surface finish of polyurethane prototypes fabricated by indirect rapid tooling: a case study

Micro-spike EEG electrode and the vacuum-casting technology for mass production

A high-efficiency automatic de-bubbling system for liquid silicone rubber

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