scholarly journals Automotive weather strip manufacturing: Process modeling and extrudate dimensional accuracy evaluation

Procedia CIRP ◽  
2018 ◽  
Vol 72 ◽  
pp. 375-380 ◽  
Author(s):  
P. Stavropoulos ◽  
H. Alexopoulos ◽  
A. Papacharalampopoulos ◽  
D. Mourtzis
Keyword(s):  
Process Modeling ◽  
Manufacturing Process ◽  
Dimensional Accuracy ◽  
Accuracy Evaluation

scholarly journals Metal Machining—Recent Advances, Applications, and Challenges

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 580
Author(s):  
Francisco J. G. Silva
Keyword(s):  
Surface Finish ◽  
Manufacturing Process ◽  
Dimensional Accuracy ◽  
Machining Process ◽  
High Dimensional ◽  
Manufacturing Processes ◽  
Recent Advances ◽  
Metal Machining ◽  
Rapid Manufacture

Though new manufacturing processes that revolutionize the landscape regarding the rapid manufacture of parts have recently emerged, the machining process remains alive and up-to-date in this context, always presenting itself as a manufacturing process with several variants and allowing for high dimensional accuracy and high levels of surface finish [...]

Dimensional Accuracy Evaluation of 3D - Printed Parts Using a 3D Scanning Surface Metrology Technique

2020 ◽  
Author(s):  
Emmanuelle R. Biglete ◽  
Jennifer C. Dela Cruz ◽  
Marvin S. Verdadero ◽  
Mark Christian E. Manuel ◽  
Allison R. Altea ◽  
...  
Keyword(s):  
Dimensional Accuracy ◽  
3D Scanning ◽  
Surface Metrology ◽  
Accuracy Evaluation ◽  
3D Printed

A High-Fidelity Thermal Model for a Novel Droplet-Based Additive Manufacturing Process for Polymers

2019 ◽  
Author(s):  
Andreas Schroeffer ◽  
Thomas Maciuga ◽  
Konstantin Struebig ◽  
Tim C. Lueth
Keyword(s):  
Heat Transfer ◽  
Additive Manufacturing ◽  
Manufacturing Process ◽  
Thermal Model ◽  
Polymer Melt ◽  
Dimensional Accuracy ◽  
Detailed Knowledge ◽  
Mechanical Component ◽  
Wide Range ◽  
Working Principle

Abstract The claim in additive manufacturing (AM) changes from simply producing prototypes as show objects to the fabrication of final parts and products in small volume batches. Thereby the focus is on freedom of material, dimensional accuracy and mechanical component properties. A novel extrusion-based AM technology has been developed focusing on these issues. The working principle is to form spheres from a thermoplastic polymer melt and build parts by single droplets. The material preprocessing is similar to the injection molding technology and enables a wide range of different thermoplastic polymers as build materials. With the droplet-based working principle high mechanical component properties and dimensional accuracy can be reached compared to similar processes. Further improvements to the process need a detailed knowledge of the physical effects during the build process. The temperature distribution during the manufacturing process determines at which temperature material is fused and how solidification takes place and shrinkage can occur or is suppressed. Thus, it has a significant influence on the mechanical properties and warpage effects of produced parts. In this work a thermal model is presented that describes the heat transfer during the build process. The necessary input data are the material properties and a print job description including the part geometry and building strategy. The basic idea is to simulate each single droplet deposition by applying a dynamic Finite Element Method. All relevant heat transfer effects are analyzed and represented in the model. The model was validated with measurements using a thermal imaging camera. Several measurements were performed during the build process and compared to the simulation results. A high accuracy could be reached with an average model error of about 4° Celsius and a maximal error of 10° Celsius.

scholarly journals Formalizing Manufacturing Process Modeling Using Composition Trees

2011 ◽  
Vol 399-401 ◽  
pp. 1852-1855 ◽  
Author(s):  
Lian Wen ◽  
David Tuffley
Keyword(s):  
Process Modeling ◽  
Manufacturing Process ◽  
Good Effect ◽  
Software Systems ◽  
Manufacturing Processes ◽  
Modeling Languages ◽  
Tree Model ◽  
Short Period

Optimizing manufacturing process modeling is critical to improving the efficiency and quality of manufacturing. However, manufacturing processes in general can be very complicated. A manufacturing process may involve (a) transforming a material into a new form, (b) combining different materials to form a new object, and (c) retrieving a certain part from a material as a new entity. All those activities could be confusing because many intermediate objects that exist only for a short period during the manufacturing process may have no formal names. To solve this problem, this paper proposes that composition trees (CT) can be successfully used to model manufacturing processes. Composition trees are parts of the formal notation in behavior engineering (BE), which is an innovative approach to the development of large software systems. For a composition tree, its characteristics of being intuitive, expressive and formal give it many advantages over other formal and informal modeling languages in software engineering. This paper uses a cooking case study to demonstrate how to use a composition tree model manufacturing processes. It is argued that the method could be applied to process engineering to good effect.

scholarly journals The Production of Plaster Molds with Patternless Process Technology

2015 ◽  
Vol 15 (2) ◽  
pp. 91-94 ◽  
Author(s):  
R. Pastirčák ◽  
A. Sládek ◽  
E. Kucharčíková
Keyword(s):  
Surface Roughness ◽  
Rapid Prototyping ◽  
Feed Rate ◽  
Manufacturing Process ◽  
Dimensional Accuracy ◽  
Mold Cavity ◽  
Drying Process ◽  
Process Technology ◽  
Batch Production ◽  
Gravity Casting

Abstract The work deals with technology Patternless process that combines 3 manufacturing process mold by using rapid prototyping technology, conventional sand formation and 3D milling. It's unconventional technology that has been developed to produce large-sized and heavyduty castings weighing up to several tons. It is used mainly in prototype and small batch production, because eliminating production of models. The work deals with the production of blocks for making molds of gypsum and gypsum drying process technology Thermomold. Into blocks, where were made cavities by milling were casted test castings from AlSi10MgMn alloy by gravity casting. At machining of the mold cavity was varied feed rate of tool of cemented carbide. Evaluated was the surface roughness of test castings, that was to 5 micrometers with feed from 900 to 1300 mm/min. The dimensional accuracy of castings was high at feed rate of 1000 and 1500 mm/min did not exceed 0.025 mm.

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