Identification of significant process parameters in variable frequency microwave curing

2007 ◽  
Author(s):  
Daniel Cepeda ◽  
Cleon Davis ◽  
Gary May
Keyword(s):  
Process Parameters ◽  
Variable Frequency ◽  
Microwave Curing ◽  
Significant Process

In Situ Acoustic Temperature Measurement During Variable-Frequency Microwave Curing

2008 ◽  
Vol 31 (4) ◽  
pp. 273-284 ◽  
Author(s):  
Cleon E. Davis ◽  
Anthony J. Dickherber ◽  
William D. Hunt ◽  
Gary S. May
Keyword(s):  
Temperature Measurement ◽  
Variable Frequency ◽  
Microwave Curing

Systems Analysis of Process Control Capabilities for Forging Accuracy

2017 ◽  
Vol 265 ◽  
pp. 1110-1115 ◽  
Author(s):  
V.G. Shibakov ◽  
D.L. Pankratov ◽  
R. Khairullin
Keyword(s):  
Process Control ◽  
Process Parameters ◽  
Systems Analysis ◽  
Simulation Modeling ◽  
Systems Approach ◽  
Dimensional Accuracy ◽  
Significant Process ◽  
Expert Analysis ◽  
Forging Force

The significance matrix for the parameters of “material-billet-equipment-process-tool-personnel-environment” system was compiled using the systems approach to the assurance of forging dimensional accuracy, and the expert analysis revealed the most significant process parameters that affect the accuracy. The application of simulation modeling helped to establish the dependence of forging force on the dimensions of an incoming billet. The paper suggests a solution to increase the accuracy of the sized forgings.

Variable frequency microwave curing of photosensitive polyimides

2001 ◽  
Vol 24 (3) ◽  
pp. 474-481 ◽  
Author(s):  
K.D. Famsworth ◽  
R.N. Manepalli ◽  
S.A. Bidstrup-Allen ◽  
P.A. Kohl
Keyword(s):  
Variable Frequency ◽  
Microwave Curing

On the effect of process parameters on properties of AlSi10Mg parts produced by DMLS

2014 ◽  
Vol 20 (6) ◽  
pp. 449-458 ◽  
Author(s):  
Manickavasagam Krishnan ◽  
Eleonora Atzeni ◽  
Riccardo Canali ◽  
Flaviana Calignano ◽  
Diego Manfredi ◽  
...  
Keyword(s):  
Process Parameters ◽  
Deep Understanding ◽  
Close Correlation ◽  
Process Window ◽  
Optimum Process ◽  
Sintering Process ◽  
Content Type ◽  
Significant Process ◽  
Macroscopic Properties ◽  
Full Factorial

Purpose – The aim of this research is to reach a deep understanding on the effect of the process parameters of Direct Metal Laser Sintering process (DMLS) on macroscopic properties (hardness and density) of AlSi10Mg parts and resulting microstructure. Design/methodology/approach – A full factorial design of experiment (DOE) was applied to determine the most significant process parameter influencing macroscopic properties of AlSi10Mg parts manufactured by DMLS process. The analysis aims to define the optimum process parameters and deduce the process window that provides better macroscopic properties of AlSi10Mg parts. Optical microscopy observations are carried out to link the microstructure to macroscopic properties. Findings – Macroscopic properties of DMLS parts are influenced by the change in process parameters. There is a close correlation between the geometry of scan tracks and macroscopic properties of AlSi10Mg parts manufactured by DMLS process. Originality/value – The knowledge of utilizing optimized process parameters is important to fabricate DMLS parts with better mechanical properties. The present research based on applying experimental design is the first analysis for AlSi10Mg parts produced in DMLS process.

Optimization of a high-pressure microwave curing process for T800/X850 carbon fiber-reinforced plastic

2019 ◽  
Vol 32 (1) ◽  
pp. 30-38 ◽  
Author(s):  
Chenglong Guan ◽  
Lihua Zhan ◽  
Guiming Liu ◽  
Xiaobo Yang ◽  
Guangming Dai ◽  
...  
Keyword(s):  
High Pressure ◽  
Heating Rate ◽  
Process Parameters ◽  
Holding Time ◽  
Curing Temperature ◽  
Measurement Capability ◽  
Microwave Curing ◽  
Trade Offs ◽  
Input Control ◽  
Interlaminar Shear

Compared with the conventional composite curing processes, high-pressure microwave curing is a promising technology. In this study, a set of devices for high-pressure microwave curing was built and equipped with real-time temperature measurement capability and a microwave input control system. The orthogonal experimental method was applied to optimize three process parameters, including the heating rate, curing temperature, and holding time, for the high-pressure microwave curing of T800/X850 composites. The effects of the three parameters on the curing quality were studied by measuring the interlaminar shear strength (ILSS) and conducting differential scanning calorimeter tests. The fracture surface of the samples was also examined by scanning electron microscopy. The results showed that the heating rate had a significant effect on the ILSS of the laminates, and the degree of cure of all samples was more than 95% in the tests. Furthermore, the optimal process parameters were determined as follows: heat up to 170°C with a heating rate of 6°C min−1 and a holding time of 90 min. The total curing time of the sample was 42.4%, and the ILSS of the sample was slightly enhanced by 0.31% compared with standard thermal curing. These results could serve to make trade-offs between reducing manufacturing time and preserving the mechanical properties of microwave-cured composites.

Multi-Response Optimization of Dissimilar Al-Ti Alloy FSW Using Taguchi - Grey Relational Analysis

2020 ◽  
Vol 833 ◽  
pp. 35-39 ◽  
Author(s):  
Shival Patel ◽  
Kishan Fuse ◽  
Khushboo Gangvekar ◽  
Vishvesh Badheka
Keyword(s):  
Process Parameters ◽  
Grey Relational Analysis ◽  
Traverse Speed ◽  
Anova Analysis ◽  
Friction Stir ◽  
Relational Analysis ◽  
Significant Process ◽  
Grey Relational Grade ◽  
Response Optimization ◽  
Grey Relational

This article presents multi-response optimization of friction stir welding of dissimilar Al 6061-Titanium alloy using Taguchi based grey relational analysis. Taguchi’s L9 orthogonal array was used for designing the experiments. Process parameters considered for the experiments were rotational speed, traverse speed and tilt angle. Ultimate tensile strength, yield strength, and % elongation were the responses measured which all are larger-the-better characteristics. Based on grey relational grade, optimum levels of process parameters were identified and further ANOVA analysis was carried out to find most significant process parameter.

Variable Frequency Microwave Curing of SU8 Photoresist Films

2014 ◽  
Vol 931-932 ◽  
pp. 101-105
Author(s):  
Christian Antonio ◽  
Piyachat Watanachai
Keyword(s):  
Heat Transfer ◽  
Poor Quality ◽  
Variable Frequency ◽  
Degree Of Cure ◽  
Microwave Curing ◽  
Micro Cracks ◽  
Negative Tone ◽  
Cure Rates ◽  
Pattern Resolution ◽  
Similar Processing

Photoresist used in the fabrication of Microelectrochemical Systems (MEMS) has traditionally been processed using conventional curing technology. This type of curing is often time intensive and results in non-uniform products. A uniform bake of the layer is not always possible due to the mechanisms of heat transfer conventional curing offers, leading to poor pattern resolution, formation of micro-cracks and severe outgassing occurring as a consequence. The Variable Frequency Microwave (VFM) Technique was successfully utilised in this study as an alternative method for the processing of negative tone SU8 photoresist. The VFM method was compared to the conventional processing method, which utilises a Hotplate, and a hybrid method utilizing both Hotplate and the VFM and found that an increase on the degree of cure was observed using the VFM at similar processing temperatures which means that SU8 curing at lower temperatures or rapid curing is possible. The increase in cure rates can be attributed to a combination of heat transfer and the unique capability of microwave to couple with the sample. Optical studies of the microstructures fabricated suggest that films that have a degree of cure of <60% resulted in poor quality microstructures. The VFM was found to achieve satisfactory microstructures at most of the temperatures tested as compared to the other two methods tested.

Sign in / Sign up

Export Citation Format

Share Document