Fabrication of High Resolution Microstructures Using Micro Hot Embossing with a Precision Rapid Tooling

2013 ◽  
Vol 747 ◽  
pp. 587-590
Author(s):  
Chil Chyuan Kuo ◽  
Hsiu Ju Hsu
Keyword(s):  
Cost Reduction ◽  
Light Wave ◽  
Optical Element ◽  
Rapid Tooling ◽  
Transcription Rate ◽  
Wave Fronts ◽  
Form Accuracy ◽  
Fabrication Cost ◽  
Molded Part ◽  
Tooling Technology

Diffractive optical element (DOE) is widely employed to convert light wave fronts in many different applications. This study demonstrated a precision hybrid rapid tooling for manufacturing the DOE. The transcription rate in the rapid tooling manufacturing process is about 92.5%. The transcription rate in the molded part is about 95.1%. Hybrid rapid tooling technology not only reduces the fabrication cost of rapid tooling but also has higher form accuracy and higher thermal conductivity. In comparison with conventional method for fabricating a pair of rapid tooling of a new DOE, a cost reduction of 60.4% can be achieved using a hybrid rapid tooling technology.

Process Analysis for Rapid Tooling Technology Based on Rapid Prototyping

2011 ◽  
Vol 216 ◽  
pp. 798-803 ◽  
Author(s):  
Hong Pu Liu ◽  
Jun Su ◽  
Xiao Jing Li
Keyword(s):  
Rapid Prototyping ◽  
Process Analysis ◽  
Rapid Tooling ◽  
Production Cycle ◽  
Fabrication Cost ◽  
Modeling Process ◽  
Working Principle ◽  
The Difference ◽  
Tooling Technology

This paper discussed the working principle, classification, modeling process and technology features for rapid tooling based on rapid prototyping and investigated into the difference between rapid tooling with traditional modeling manufacture. Several typical rapid tooling technologies are compared and summarized from mould period, fabrication cost and production cycle. Some key problems that rapid tooling industry will face with are analyzed. The application of the rapid tooling based on rapid prototyping is prospected.

A Novel ALU Circuit based on Reversible Logic

2019 ◽  
Vol 29 (11) ◽  
pp. 2050172
Author(s):  
Arindam Banerjee ◽  
Debesh Kumar Das
Keyword(s):  
Cost Reduction ◽  
Delay Line ◽  
Reversible Logic ◽  
Quantum Cost ◽  
Logic Function ◽  
Fabrication Cost

We propose a new ALU circuit based on reversible logic. The ALU circuit implements two addition methodologies. The outputs are generated at some fixed lines for each arithmetic or logic function. A satisfactory tradeoff is achieved between the line count and the quantum cost. Reduction in ancillary inputs and garbage outputs causes a decrease in fabrication cost. The proposed designs outperform the earlier designs with respect to delay, line count and number of operations. The libraries NOT–CNOT–V–[Formula: see text] are used to optimize the quantum cost of the proposed designs.

Comparative study of rapid and conventional tooling for plastics injection molding

2017 ◽  
Vol 23 (2) ◽  
pp. 344-352 ◽  
Author(s):  
Gabriel Antonio Mendible ◽  
Jack A. Rulander ◽  
Stephen P. Johnston
Keyword(s):  
Injection Molding ◽  
Lower Cost ◽  
Rapid Tooling ◽  
Content Type ◽  
Part Quality ◽  
Molded Part ◽  
Molded Parts ◽  
Plastics Injection Molding ◽  
Rate Of Cooling ◽  
Manufacturing Techniques

Purpose This study aims to evaluate the performance of injection molding inserts produced via rapid and conventional manufacturing techniques considering the mechanical and thermal performance of the tools as well as the resulting molded part quality. Design/methodology/approach Three insert materials and manufacturing techniques were evaluated, jetted photopolymer (PolyJet) 3D printing using digital ABS, direct metal laser sintering (DMLS) using bronze and machining using stainless steel. Molding trials were performed, and the insert surface temperature, longevity and part properties were evaluated. Complementary information was acquired using computer simulation. Findings Similar behavior and part quality were observed in machined and DMLS inserts. The latter were used for 500 cycles without any signs of failure. PolyJet inserts had increased cycle time and slower rate of cooling which increased shrinkage and crystallinity in the molded parts. PolyJet inserts could be produced quickly at a lower cost than machined or DMLS inserts. Research limitations/implications Cooling within the insert was not studied; inserts were cooled indirectly by the mold plates behind them. Subsequent studies will incorporate cooling lines directly into the inserts. Originality/value Little research has been done to understand the thermal behavior of inserts manufactured via rapid tooling techniques. This study provides a direct comparison between rapid tooling techniques, which is supported by simulation results and analysis of the actual molding properties.

Simulation and Experimental Analysis of Moulding Processes of Glass Diffractive Optical Elements

2012 ◽  
Vol 217-219 ◽  
pp. 1646-1649 ◽  
Author(s):  
Chia Jung Chang ◽  
Choung Lii Chao ◽  
Wen Chen Chou ◽  
Yu Kun Chen ◽  
Kung Jeng Ma ◽  
...  
Keyword(s):  
Optical Element ◽  
Dimensional Accuracy ◽  
Optical Systems ◽  
Free Form ◽  
Market Demand ◽  
Optical Elements ◽  
Form Accuracy ◽  
Moulding Process ◽  
The Difference ◽  
Glass Lenses

Driven by the huge market demand, the glass lenses made of various optical glasses are required to be more diversified in sizes/shapes, to have better form accuracy/ surface roughness, to be more environmental durable, and to be more competitive in price. In comparison to conventional refractive lens, diffractive lens (diffractive optical element, DOE) has the advantages of being thinner and lighter, and is widely used in optical systems such as lighting and photovoltaic systems. Glass moulding process(GMP) is regarded as a very promising technique for mass producing high precision optical components such as spherical/ aspheric glass lenses and free-form optics. However, only a handful of materials can sustain the chemical reaction, mechanical stress and temperature involved in the glass moulding process. Besides, almost all of these mould materials are classified as hard-to-machine materials. This makes the machining of these materials to sub-micrometer form accuracy and nanometer surface finish a rather tough and expensive task. As a result, making service life of mould longer has played a critical part in the GMP industry. The excessive stress and/or temperature involved in the moulding process are amongst the main reasons for pre-matured mould failure. This research aimed to analyze the stress/strain conditions and the obtained dimensional accuracy under various molding parameters by simulations. Molding experiments were subsequently carried out to verify the simulated results. A glass DOE of 14.8 mm in diameter and 3.36 mm in thickness are successfully produced in this research and the difference between the simulated and the molded DOE is around 15μm.

scholarly journals Computer simulation of thermoforming process and its verification using a rapid tooling mould

2018 ◽  
Vol 157 ◽  
pp. 02032
Author(s):  
Michał Modławski ◽  
Tomasz Jaruga
Keyword(s):  
Computer Simulation ◽  
Thickness Distribution ◽  
Rapid Tooling ◽  
Fused Deposition Modelling ◽  
Fused Deposition ◽  
Poly Ethylene Terephthalate ◽  
Thermoforming Process ◽  
Poly Ethylene ◽  
Tooling Technology

The results of computer simulation of thermoforming process made using ANSYS Polyflow software are presented in this paper. The analysis of the wall thickness distribution across an U-shaped thermoformed product manufactured using a positive mould was made. The simulation results were verified using a mould manufactured in a 3D printing process which was Fused Deposition Modelling (FDM) and a poly(ethylene terephthalate) formed sheet. It was proven that the computer simulation and a tool made with a Rapid Tooling technology can be useful for predicting the quality of a thermoformed part, particularly to find the problems with thin-walled areas.

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