Topic
Process variable
About: Process variable is a research topic. Over the lifetime, 3983 publications have been published within this topic receiving 43130 citations. The topic is also known as: process parameter.
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TL;DR: A systematical approach of formulation and process development has been proposed for excipient selection, critical process parameter identification, and necessary tests for roller compaction process parameters and their impact on the critical quality attributes of the final product.
108 citations
TL;DR: A central composite design technique and mathematical model was developed by response surface methodology with three parameters, three levels and 20 runs, was used to develop the relationship between the FSW parameters (rotational speed, traverse speed, axial force) and the responses (tensile strength, yield strength, and %Elongation (%E) were established.
107 citations
TL;DR: In this paper, a process map for the parameters laser power, powder feed rate and scanning speed for a commercial Lasertec 65 3D hybrid machine was created using semi-empiric correlations from literature between combined parameters and resulting tracks.
Abstract: Laser cladding and additive manufacturing based on the laser cladding process are becoming extremely important in industrial applications. This causes the necessity for process parameter maps that make the process as effective as possible. This paper offers guidelines to evaluate process parameter maps for single tracks, which are a requirement for high quality claddings and 3D structures. The procedure is executed creating a process map for the parameters laser power, powder feed rate and scanning speed for a commercial Lasertec 65 3D hybrid machine. Commercially available Inconel 718 powder is used as a basis for this study. Besides using semi-empiric correlations from literature between combined parameters and resulting tracks, further quality measures like the build rate and an arbitrary geometry factor are taken into account. Furthermore, a general guideline to determine further correlations is presented. A comparison to literature shows that some correlations appear to be widely applicable on different machines and materials.
107 citations
TL;DR: In this article, the authors developed empirical models in designing friction stir welding (FSW) tools and FSW welders, which may be further helpful for making process parameter choice for this sort of alloy, defining welding program and control of process parameters.
105 citations
TL;DR: In this paper, a non-dimensional plot (termed a process map) is developed from numerical models of laser-based material deposition of thin-walled structures, which quantifies the effects of changes in wall height, laser power, deposition speed and part preheating on melt pool length.
Abstract: In solid freeform fabrication (SFF) processes involving thermal deposition, thermal control of the process is critical for obtaining consistent build conditions and in limiting residual stress-induced warping of parts. In this research, a nondimensionalized plot (termed a process map) is developed from numerical models of laser-based material deposition of thin-walled structures. This process map quantifies the effects of changes in wall height, laser power, deposition speed and part preheating on melt pool length, which is an essential process parameter to control in order to obtain consistent build conditions. The principal application of this work is to the Laser Engineered Net Shaping (LENS) process under development at Sandia Laboratories; however, the general approach and a subset of the presented results are applicable to any SFF process involving a moving heat source. Procedures are detailed for using the process map to predict melt pool length and predictions are compared against experimentally measured melt pool lengths for stainless steel deposition in the LENS process.
105 citations