Experimental Research on Vacuum Casting of Micro-Gears

2011 ◽  
Vol 383-390 ◽  
pp. 1714-1718
Author(s):  
Xiao Ming Zuo
Keyword(s):  
High Precision ◽  
Experimental Research ◽  
Silicone Rubber ◽  
Orthogonal Experiment ◽  
Vacuum Casting ◽  
Silicone Mould ◽  
Shape And Size

This paper discusses the feasibility of vacuum casting of micro-gears by using silicone mould of micro-gears which was designed and manufactured by the author. Orthogonal experiment is adopted to explore the influence of temperatures of mould, resin and solidification and the time of vacuum deaeration upon the shape and size of micro-gears. The result of research shows that formed parts with high precision can be obtained by vacuum casting of micro-gears with silicone rubber mould, and the time of vacuum deaeration greatly affects the shape and size of formed parts of micro-gears

Experimental Research on the Emission Characteristics of City Taxies

2013 ◽  
Vol 295-298 ◽  
pp. 1529-1534
Author(s):  
Long Lin Sun ◽  
Wen Wei Huang ◽  
Mou Rong Gao
Keyword(s):  
High Precision ◽  
Experimental Research ◽  
High Speed ◽  
Emission Characteristics ◽  
Experiment Data ◽  
Mobile Emission

The taxies’ emission experiments on urban roads are carried out with a high-precision mobile emission analyzer. Then the emission characteristics are analyzed. The experiment data show that the high speed, the low acceleration and the low VSP will be helpful to decrease the emission and the long mileage will worsen the emission.

Process Parameter Experiments on Vacuum Casting Using a Silicone Rubber Mold for ABS Plastic Parts

2011 ◽  
Vol 201-203 ◽  
pp. 1668-1671
Author(s):  
Dar Yuan Chang ◽  
Chyn Shu Deng
Keyword(s):  
Silicone Rubber ◽  
Optimal Parameter ◽  
Rapid Tooling ◽  
Process Parameter ◽  
Taguchi’S Method ◽  
Vacuum Casting ◽  
Soft Mold ◽  
Master Pattern ◽  
Plastic Parts ◽  
Silicone Rubber Mold

Silicone rubber mold is one of soft mold processes for rapid tooling. Based on a master pattern, it can be used for casting the materials of wax, plastic, and low-melting metals directly during a short developing time, very suitable for sample fabrications. This paper conducts vacuum casting experiments by Taguchi’s method to derive the optimal parameter selections on ABS plastic vacuum casting using a silicone rubber mold. The factor that affects pouring characteristics maximally is the mold vacuuming time.

Injection moulding of high precision optics for light-emitting diodes made of liquid silicone rubber

2016 ◽  
Vol 49 (1) ◽  
pp. 62-76 ◽  
Author(s):  
Christian Hopmann ◽  
Malte Röbig
Keyword(s):  
Energy Efficiency ◽  
Uv Radiation ◽  
High Precision ◽  
Silicone Rubber ◽  
Injection Moulding ◽  
Light Sources ◽  
Light Emitting ◽  
Semiconductor Chip ◽  
Liquid Silicone Rubber ◽  
Liquid Silicone

In the market of lighting technologies, light-emitting diodes (LEDs) gradually substitute conventional light sources. Because of their high energy efficiency and long lifetime, they are increasingly used in consumer products, interior and exterior lighting applications in the home and mobility sector as well as in industrial applications. The material properties in the surrounding area of the light-emitting semiconductor chip are crucial to the performance of LED. Although the energy efficiency of LED is higher compared to conventional light sources, temperatures exceed about 150°C close to the semiconductor chip. Especially in combination with high amounts of blue ultraviolet (UV) radiation, the materials for encapsulation cannot meet the requirements and reduce the lifetime of an LED significantly. Contrary to conventional materials, high transparent liquid silicone rubber (LSR) can resist high temperatures as well as UV radiation and offer a great freedom in design. This enables the combination of the encapsulation (primary optics) and the secondary optics in one component. The objective of an ongoing joint research project with various partners from the industry is the development of an innovative injection moulding process for high precision optics in LED applications made of LSR, which is analysed at the Institute of Plastics Processing (IKV), Aachen, Germany. Therefore, the LED board is placed in the injection mould and overmoulded with LSR. The goal is a highly integrated process with major emphasis on the reduction of components, mounting steps and costs. Furthermore, the combination of primary and secondary optics promises an improved effectiveness because losses in light power due to the transition of the primary and secondary optics are reduced.

Development of a Low-Cost Automatic Vacuum Degassing System for Rapid Tooling

2013 ◽  
Vol 459 ◽  
pp. 349-355
Author(s):  
Chil Chyuan Kuo ◽  
Min Hsiang Wu ◽  
Ming Yang Lai
Keyword(s):  
Silicone Rubber ◽  
Human Error ◽  
Low Cost ◽  
Vacuum Pump ◽  
Vacuum Casting ◽  
Vacuum Degassing ◽  
Casting System ◽  
Air Pollutions ◽  
The Cost ◽  
Silicone Rubber Mold

Silicone rubber mold is frequently used in the indirect tooling. Automatic vacuum casting system is widely used to degas in the manufacturing of silicone rubber mold, but the cost of hardware is very expensive. A low-cost automatic vacuum degassing system is designed, build and test in this study. Optimized parameters for degassing process are investigated. The saving in the degassing time is about 23.4%.This system offers many advantages such as reducing human error of operator, reducing noise and air pollutions derived from the vacuum pump of the vacuum casting system.

Experimental research on shape and size distribution of biomass particle

Fuel ◽  
2012 ◽  
Vol 94 ◽  
pp. 551-555 ◽  
Author(s):  
Qiang Guo ◽  
Xueli Chen ◽  
Haifeng Liu
Keyword(s):  
Size Distribution ◽  
Experimental Research ◽  
Shape And Size

Research on One-Time Forming Process of Matrix PDC Bits

2010 ◽  
Vol 156-157 ◽  
pp. 190-193
Author(s):  
Zhong Liang Wei ◽  
Hang Wen ◽  
Qing He ◽  
Jin Mei Sun
Keyword(s):  
High Precision ◽  
Silicone Rubber ◽  
Production Efficiency ◽  
Graphite Powder ◽  
Technical Program ◽  
Forming Process ◽  
Increase Production Efficiency ◽  
Good Consistency ◽  
Rubber Forming ◽  
Powder Forming

Due to the difficulty in the ceramic mould forming process of matrix PDC bits and low production efficiency, a manufacturing mould technology of graphite powder forming process was developed. The technical program is to formulate a circuit of silicone rubber forming process, determine the forming process of first mould, rubber mould and graphite powder mould, and sinter bit. The results show that manufacturing bit mould to sinter PDC bits with this method can simplify the circuit, increase production efficiency, and improve bit quality. The resulting bit is also of high precision, exquisite appearance and good consistency

Experimental Research on Producing Shale Oil through Thermal Cracking of Small-Particle Oil Shale

2013 ◽  
Vol 652-654 ◽  
pp. 839-843
Author(s):  
Zhi Yang Yuan
Keyword(s):  
Fluidized Bed ◽  
Experimental Research ◽  
Small Particle ◽  
Oil Shale ◽  
Orthogonal Experiment ◽  
Thermal Cracking ◽  
Shale Oil ◽  
Technological Parameters ◽  
Oil Productivity ◽  
Experimental Researches

Aiming at utilization status of China’s small particle oil shale, in the condition of laboratory, self-developed instrument of fluidized bed thermal cracking is used to conduct experimental researches on producing shale oil through thermal cracking of small-particle oil Shale. Through the orthogonal experiment, the optimal technological parameters on producing shale oil through thermal cracking are optimized. The experimental results have shown us that under the optimal technological conditions, oil productivity is at about 5%. Therefore, the technology of fluidized bed thermal cracking is an effective new method for producing oil through small-particle oil shale.

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