The manufacture of micromould and microparts by vacuum casting

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

doi:10.1007/s00170-007-1151-4

Cited by 17 publications

(8 citation statements)

References 9 publications

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“…Zamani et al [17] compared the dimensional accuracy of wax pattern of gas turbine blade produced by epoxy moulds and silicone rubber moulds and concluded that epoxy mould can produce more accurate models than the silicone rubber mould. Thian et al [18] employed vacuum casting method to produce micromoulds and microgears using silicone rubber mould and investigated that the deviation between the master pattern and its ten specimens was very small and the proposed method is highly capable of consistently producing micro parts that are dimensionally accurate with respect to the master pattern. Singh and Singh [19] made investigations to develop macro-model of silicon moulding process for the fabrication of plastic components with regard to dimensional accuracy and concluded that the tolerance grades for plastic components prepared with SM are consistent with the permissible range of tolerance grades as per ISO standard UNI EN 20286-I (1995) and DIN16901.…”

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

“…[15][16][17] Traditionally, this kind of optics would require injection moulding but that would be expensive in small series manufacturing. 8 Therefore, rapid prototyping was experimented aiming for significantly lower costs with reasonable optical quality.…”

Section: Optics Manufacturing With the Rapidmentioning

confidence: 99%

“…Steady-state thermal 16 simulations were made using commercial Comsol Multiphysics software. Conduction, convection, and radiation heat transfer were included.…”

Section: Mechanical and Thermal Designmentioning

confidence: 99%

“…prototyping method The optics was manufactured using a PUR vacuum casting rapid prototyping process that is a suitable manufacturing process for small numbers of prototypes. [15][16][17] Traditionally, this kind of optics would require injection moulding but that would be expensive in small series manufacturing. 8 Therefore, rapid prototyping was experimented aiming for significantly lower costs with reasonable optical quality.…”

Section: Optics Manufacturing With the Rapidmentioning

confidence: 99%

“…In this paper, polyurethane, vacuum casting, rapid prototyping method is introduced for freeform lens manufacturing. Vacuum casting is a fast and cost-effective method for producing small numbers of highly accurate PUR prototype parts, such as microgears 16 and lenses. 17 Here, the performance of the rapid manufacturing method is validated with the innovative design of a LED downlight luminaire with an electrically adjustable light beam divergence.…”

Section: Introductionmentioning

confidence: 99%

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Rapid prototyping of freeform optics for an LED downlighter with a dynamically adjustable beam

Juntunen

Myöhänen

Tetri

et al. 2016

Lighting Research & Technology

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In this paper, an LED downlight producing dynamic beam variation without any mechanically moving parts is presented. The functionality is based on an optics design using compound parabolic concentrators equipped with individual LEDs. With suitable driving of the LEDs, a dynamic far-field beam with an adjustment range of between 168 and 558 is achieved. The luminaire is used as a demonstration of the polyurethane vacuum casting rapid manufacturing method to produce low-cost freeform optics for prototypes. The simulations and measurements on the realized prototype show that the method is suitable for small series and prototype manufacturing, but also reveal potential errors in the rapid manufacturing process to be avoided in the future.

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Dental Crowns by FDM Assisted Vapour Smoothing and Silicon Moulding

Singh

Dureja

2020

Materials Horizons: From Nature to Nanomaterials

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The manufacture of micromould and microparts by vacuum casting

Cited by 17 publications

References 9 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

Rapid prototyping of freeform optics for an LED downlighter with a dynamically adjustable beam

Dental Crowns by FDM Assisted Vapour Smoothing and Silicon Moulding

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