Effect of differential pressure on the transcription rate of micro-featured components

Kuo, Chil-Chyuan; Qiu, Wei-Kai

doi:10.1007/s00170-019-04013-5

Cited by 4 publications

(2 citation statements)

References 24 publications

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“…It accelerates the casting process and allows the use of resins with high viscosity, short pot life, and a large portion of fillers. In addition, this method is reported to reduce warpage and defects [26,27]. Various process parameters in VDPC, including cavity temperature, mixing time, differential pressure time, and inlet valve angle, were optimized in studies by Kuo et al [17] and Xu et al [28].…”

Section: Process Flowmentioning

confidence: 99%

Industrial‐scale vacuum casting with silicone molds: A review

Wortmann

Frese

2022

Applied Research

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Vacuum casting (VC) of reactive polymer resins in silicone molds is one of the oldest rapid tooling methods. It is widely used in the industry for prototype and small‐series production of thermoset plastic parts. Despite its widespread use, its scientific exploration is still scarce compared to other prototyping methods, such as three‐dimensional (3D) printing. Compared to conventional 3D printing methods, a wide range of excellent material properties can be achieved, making it well suited for the production of functional prototypes and even final products. The properties of the thermosets are comparable to those of injection molding in terms of viable shapes, mold fidelity, and material properties. However, due to the high cycle time and limited service life of the molds, VC is rarely utilized for mid‐ or large‐series production. Here, we provide a comprehensive overview of the state of the art and recent advances in the field. The review also provides a detailed technical introduction to the mold production, the process flow, and the materials used. A particular focus is on the key challenges facing industrial‐scale VC today—how to reduce cycle time, and how to increase mold service life?

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Section: Process Flowmentioning

confidence: 99%

Industrial‐scale vacuum casting with silicone molds: A review

Wortmann

Frese

2022

Applied Research

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“…However, conventional vacuum casting employs the gravity of molding material to fill the mold cavity, resulting in some common defects, such as insufficient filling, shrink marks, or trapped air observed in the cast. Especially, these defects can be eliminated using differential pressure vacuum casting (DPVC) [ 18 ]. Therefore, the end-use prototypes can fundamentally be formed by silicone rubber mold using DPVC.…”

Section: Introductionmentioning

confidence: 99%

Characterizations of Polymer Gears Fabricated by Differential Pressure Vacuum Casting and Fused Deposition Modeling

Kuo

Lin

et al. 2021

Polymers

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In recent years, polymer gears have gradually become more widely employed in medium or heavy-duty conditions based on weight reduction in transmission systems because of low costs and low noise compared to metal gears. In the current industry, proposing a cost-effective approach to the manufacture of polymer gears is an important research issue. This paper investigates the wear performance of polymer gears fabricated with eight different kinds of materials using differential pressure vacuum casting and additive manufacturing techniques. It was found that both additive manufacturing and differential pressure vacuum casting seem to be an effective and cost-effective method for low-volume production of polymer gears for industrial applications. The gate number of one is the optimal design to manufacture a silicone rubber mold for differential pressure vacuum casting since the weld line of the polymer is only one. Polyurethane resin, 10 wt.% glass fiber-reinforced polylatic acid (PLA), or 10 wt.% carbon fiber-reinforced PLA are suggested for manufacturing gears for small quantity demand based on the deformation and abrasion weight percentage under process conditions of 3000 rpm for 120 min; epoxy resin is not suitable for making gears because part of the teeth will be broken during abrasion testing.

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