Development and application of a mold clamping mechanism for improving dimensional accuracy of vacuum casting parts and reducing mold production cost

Kuo, Chil-Chyuan; Liu, Hsueh-An; Lu, Hongbo; Shi, Pi-Rong

doi:10.1007/s00170-021-08029-8

Cited by 3 publications

(1 citation statement)

References 25 publications

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“…The optimization of the mechanical and physical properties using the Taguchi method for an LSR injection mold could also be investigated [ 32 ]. Additionally, the optimization of the curing phase of an LSR injection molding using the Moldex 3D simulation software is also an important research issue [ 33 , 34 , 35 ]. These issues are currently being investigated and the results will be presented in a later study.…”

Section: Resultsmentioning

confidence: 99%

Development of an Epoxy-Based Rapid Tool with Low Vulcanization Energy Consumption Channels for Liquid Silicone Rubber Injection Molding

Kuo

Tasi

Hunag³

2022

Polymers

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Liquid silicone rubber (LSR) parts have some distinct characteristics such as superior heat stability, low-temperature flexibility, aging resistance, and chemical resistance. From an industrial standpoint, the uniform vulcanization temperature of LSR is an important research point. However, the uniformity of the vulcanization temperature of LSR has been limited since the layout of the cartridge heater incorporated in the conventional steel mold does not follow the profile of the mold cavity. Metal additive manufacturing can be used to make LSR injection molds with conformal heating channels and conformal cooling channels simultaneously. However, this method is not suitable for a mold required to develop a new LSR product. In this study, a cost-effective approach was proposed to manufacture an LSR injection mold for the pilot run of a new optical lens. A rapid tool with low vulcanization energy consumption channels was proposed, which was incorporated with both a conformal heating channel (CHC) and conformal cooling channel (CCC) simultaneously. The function of the CHC was to vulcanize the LSR in the cavity uniformly, resulting in a shorter cycle time. The function of the CCC was to keep the LSR in a liquid state for reducing runner waste. It was found that the equation of y = −0.006x3 + 1.2114x2 − 83.221x + 1998.2 with the correlation coefficient of 0.9883 seemed to be an optimum trend equation for predicting the solidification time of a convex lens (y) using the vulcanizing hot water temperature (x). Additionally, the equation of y = −0.002x3 + 0.1329x2 − 1.0857x + 25.4 with the correlation coefficient of 0.9997 seemed to be an optimum prediction equation for the solidification time of a convex lens (y) using the LSR weight (x) since it had the highest correlation coefficient. The solidification time of a convex lens could be reduced by about 28% when a vulcanizing hot water temperature of 70 °C was used in the LSR injection mold with CHC.

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Section: Resultsmentioning

confidence: 99%

Development of an Epoxy-Based Rapid Tool with Low Vulcanization Energy Consumption Channels for Liquid Silicone Rubber Injection Molding

Kuo

Tasi

Hunag³

2022

Polymers

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Effect of N-heterocyclic carbenes-Pt catalytic system and crosslinking networks on the pyrolytic behavior of liquid silicone rubber

Wang,

Li,

Qin

et al. 2024

Polymer Degradation and Stability

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Research on the forming and demolding process of shape memory self-demolding mold

Wang,

Zhang

2024

AIP Advances

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The molding method is highly anticipated in engineering fields and has been preliminarily applied. However, traditional demolding methods introduce subtle deviations in demolding direction, leading to demolding defects and reduced forming accuracy. To address this, we developed an innovative Shape Memory Polymer (SMP) mold. Through finite element simulation, we extensively investigated the effects of diaminodiphenylmethane (DDM) addition, temperature, and load on the template forming and shape recovery processes. Finally, we experimentally verified the feasibility of the self-demolding of the template. The findings demonstrate that as the amount of DDM added increases, the glass transition temperature of SMP progressively elevates. This can be attributed to the enhanced crosslinking triggered by the addition of DDM. Consequently, during the stage of preserving shape in mold formation, SMP exhibits a heightened storage modulus and diminished shape recovery. Notably, when 1.5 g of DDM is added, the shape memory template exhibits the least shape recovery, with a shape retention rate of 78.2%. Conversely, employing 1.6 g of DDM generates the highest shape recovery but only achieves a shape retention rate of 59.5%. Augmenting the amount of DDM is advantageous in accomplishing template demolding. Higher temperatures expedite the initiation of the shape recovery process, facilitating template demolding during the shape recovery stage. Moreover, increasing the load can minimize template rebound and enhance the precision of mold formation. However, it also intensifies the complexity of self-demolding. Consequently, it is imperative to sensibly determine and implement suitable process parameters in applications.

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Development and application of a mold clamping mechanism for improving dimensional accuracy of vacuum casting parts and reducing mold production cost

Cited by 3 publications

References 25 publications

Development of an Epoxy-Based Rapid Tool with Low Vulcanization Energy Consumption Channels for Liquid Silicone Rubber Injection Molding

Development of an Epoxy-Based Rapid Tool with Low Vulcanization Energy Consumption Channels for Liquid Silicone Rubber Injection Molding

Effect of N-heterocyclic carbenes-Pt catalytic system and crosslinking networks on the pyrolytic behavior of liquid silicone rubber

Research on the forming and demolding process of shape memory self-demolding mold

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