scholarly journals Possibility for Replicating Mechanoscopic Surface Marks in the Hybrid Vacuum-Pressure Casting Process

Polymers ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 874
Author(s):  
Mariusz Frankiewicz ◽  
Karol Kobiela ◽  
Tomasz Kurzynowski
Keyword(s):  
Geometrical Structure ◽  
Casting Process ◽  
Polymer Materials ◽  
Vacuum Pressure ◽  
Pressure Casting ◽  
Main Research ◽  
Casting Technology ◽  
The Individual ◽  
Cast Parts

Vacuum-pressure casting technology allows small batches of components to be manufactured from polymer materials, mainly from thermosetting plastics such as polyurethane and epoxy resins. Apart from being very simple, the process is also advantageous in that it offers a very accurately reproduced geometrical structure of the surfaces of master patterns used in mold manufacturing. This article presents the results of analyses performed for the process of replicating mechanoscopic marks with the use of three vacuum casting variants, including a hybrid vacuum-pressure casting process developed in particular for the replication purposes. The main research objective was to analyze and evaluate the influence of the parameters of the individual process variants on the quality of the obtained cast parts and on the replication accuracy without introducing additional artifacts on their surfaces. The article discusses the individual stages of the process and provides an analysis of their parameters. The replicas were evaluated for their porosity and reproduction quality with the use of CT methods and comparative photographs obtained from a light microscope.

THE INFLUENCE OF ADDITIVE TECHNOLOGY ON THE QUALITY OF THE SURFACE LAYER AND THE STRENGTH STRUCTURE OF PROSTHETIC CROWNS

Tribologia ◽  
2018 ◽  
Vol 280 (4) ◽  
pp. 13-22
Author(s):  
Łukasz BOJKO ◽  
Wojciech RYNIEWICZ ◽  
Anna M. RYNIEWICZ ◽  
Marcin KOT ◽  
Paweł PAŁKA
Keyword(s):  
Surface Layer ◽  
Layer Structure ◽  
Casting Process ◽  
Additive Technology ◽  
Cocrmo Alloy ◽  
Casting Technology ◽  
Stomatognathic System ◽  
Cad Cam ◽  
Hard Structures

Prosthetic crowns reproduce the damaged hard structures of the patient’s own teeth and take over their natural functions, thus securing the correct reconstruction of the stomatognathic system. The aim is to evaluate the crowns for premolars and molars produced by casting, milling, and Selective Laser Melting technologies, in terms of the accuracy of reproducing the degree against the prosthetic pillar, the analysis of the surface layer structure of the step, and the micromechanical parameters of the alloy. The study material included CoCrMo alloy crowns. The conducted study allowed finding that the tightness of prosthetic crowns made using traditional casting technology as well as in SLM milling and technology is comparable and meets clinical requirements. Structural crown analyses confirmed the very good quality of the surface layer obtained with milling technology and SLM technology using the CAD/CAM method. SLM and digital milling allow the formation of precise and durable structures constituting the foundation of crowns in a time much shorter than the casting process.

Using Simulation to Improve the Quality of the Metallic Industrial Components Made by Rapid Casting

2015 ◽  
Vol 808 ◽  
pp. 187-192
Author(s):  
Alina Popan ◽  
Nicolae Bâlc ◽  
Alexandru Popan ◽  
Nicolae Panc ◽  
Cristina Stefana Borzan
Keyword(s):  
Surface Defects ◽  
Casting Process ◽  
Complex Geometries ◽  
Thin Sections ◽  
Vacuum Casting ◽  
Rapid Casting ◽  
Casting Technology ◽  
Small Series ◽  
Complex Shapes

Industrial parts with complex shapes are characterized by thin sections and complex geometries. Rapid vacuum casting is an ideal technology to manufacture complicated parts in small series production or prototypes. Contributions regarding simulation and analyzing of the parts made by rapid vacuum casting technology are presented in this study. Using dedicated software for simulating the casting process was analyzed and optimized the time of casting, the complete filling with material and also reducing the surface defects.

Diagnostics of Aluminum Alloys Melting Temperature in High Pressure Casting

2015 ◽  
Vol 669 ◽  
pp. 110-117 ◽  
Author(s):  
Ján Dubják ◽  
Ján Piteľ ◽  
Mária Tóthová
Keyword(s):  
High Pressure ◽  
Casting Process ◽  
Pressure Casting ◽  
Correct Process ◽  
Microsoft Excel ◽  
Type K ◽  
Protective Tube ◽  
Exact Measurement ◽  
True Values

The high pressure casting process is a well-established way for the manufacture of non-ferrous components. Temperature is important technological parameter of production that affects the structure and quality of castings. Using continual exact measurement of alloy temperature is the best approach for predicting structures quality problems.Temperature measurement system also would help to acquire feedback from the manufacturing process so as to prevent possible defects in next phases of manufacturing. For this measurement we used thermocouple type „K“ in protective tube from graphite. It is necessary for correct process to know true values of temperature. For diagnostics we used procedures of SPC (StatisticalProcess Control) and Microsoft Excel 2007 graphic tools.

Studying on Hot Pressure Casting Process of CaZr0.9In0.1O3-α Tubes for Hydrogen Sensor in Aluminum Melt

2013 ◽  
Vol 706-708 ◽  
pp. 301-303 ◽  
Author(s):  
Dong Wang ◽  
Sheng Li Li ◽  
Wei Juan Li ◽  
Ji Guang Li ◽  
Jun Liu ◽  
...  
Keyword(s):  
Proton Conductor ◽  
Casting Process ◽  
Hydrogen Sensor ◽  
Mold Temperature ◽  
Pressure Casting ◽  
Forming Process ◽  
Relationship Of ◽  
Casting Pressure ◽  
The Relationship

The relationship of the powders and binder system and forming process on the quality of the U-shaped proton conducting CaZr0.9In0.1O3-α tubes was studied. The results showed that defect-free green bodies can be obtained under the conditions of the wax slurry containing 87.8% (mass percentage, the same below) proton conductor powders, 11% paraffin wax, 1% beeswax and 0.2% oleic acid, the wax slurry and mold temperature at 73°C and 30°C, the casting pressure and time at 0.5MPa and 15s. A reasonable wax removing schedule about the green bodies was put forward. At last the sintered samples were characterized by higher density and less shrink rate and distortion.

Research on Horizontal Electromagnetic Continuous Casting of Sn-P Bronze Strips

2007 ◽  
Vol 26-28 ◽  
pp. 377-380
Author(s):  
Chun Hua Hui ◽  
Ting Ju Li ◽  
Wen Zhong Jin
Keyword(s):  
Electromagnetic Field ◽  
Continuous Casting ◽  
Casting Process ◽  
Optical Microscope ◽  
Shrinkage Cavity ◽  
Casting Technology ◽  
Graphite Mold ◽  
Electromagnetic Continuous Casting ◽  
A Current

In order to improve the quality of tin-phosphor bronze strips, the horizontal electromagnetic continuous casting technology, i.e. imposing alternating electromagnetic field to the horizontal continuous casting process of tin-phosphor bronze strips was developed. The effect of electromagnetic field on the quality of tin-phosphor bronze strips was studied with electron probe microanalysis (EPMA) and optical microscope. The results showed that when the alternating electromagnetic field with 50 Hz frequency and 18 A current was imposed, the crystal grain of the tin-phosphor bronze strips was obviously refined and the segregation and shrinkage cavity were greatly reduced. The quality of tin-phosphor bronze strips was remarkably improved, so the annealing time was shortened from 7 hours to 5 hours, and the service life of graphite mold was extended from 168 hours to 334 hours.

Metal Quality - From Ingot to Finished Product

2005 ◽  
Vol 488-489 ◽  
pp. 65-72 ◽  
Author(s):  
Per Bakke ◽  
Per Kristian Andersen ◽  
Jørild M. Svalestuen ◽  
Svenn Ivar Strømhaug
Keyword(s):  
Performance Indicators ◽  
Die Casting ◽  
Metal Loss ◽  
Metal Quality ◽  
Surface Appearance ◽  
Die Cast ◽  
The Individual ◽  
Time Of Operation ◽  
Cast Parts

Optimum performance of metal in the die casting shop in terms of metal loss, sludge generation, and high quality and consistency in mechanical properties of the die cast components are becoming increasingly important. In this context metal quality both from alloy producers’, die casters’ and end users’ perspectives is critical. The term metal quality can be defined to include 1) chemical composition, 2) inclusions and porosity inside the metal, 3) the surface appearance, and 4) consistency. This definition may apply to ingots as well as die cast parts. When the ingots are remelted and processed in the die casting shop, the effect of ingot surface quality and porosity on performance and properties is usually overshadowed by the quality of the processes in the die casting furnace. The paper discusses how the alloy gradually loses its pre-history. If the metal quality becomes inferior, housekeeping may become notoriously difficult, affecting important performance indicators such as up-time of operation and scrap rate. In partnership with the individual die casters, Hydro Magnesium offers assistance and audits to further improve the die caster’s performance and products.

scholarly journals Combining Chromatographic, Rheological, and Mechanical Analysis to Study the Manufacturing Potential of Acrylic Blends into Polyacrylic Casts

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6939
Author(s):  
Pablo Reyes ◽  
Mariya Edeleva ◽  
Dagmar R. D’hooge ◽  
Ludwig Cardon ◽  
Pieter Cornillie
Keyword(s):  
Mechanical Properties ◽  
Sustainable Use ◽  
Casting Process ◽  
Material Design ◽  
Mechanical Analysis ◽  
Polymer Materials ◽  
Corrosion Casting ◽  
Science Field ◽  
The Individual ◽  
The Impact

Polyacrylics have been considered for a broad range of material applications, including coatings, dental applications, and adhesives. In this experimental study, the casting potential of a group of (co)monomers belonging to the acrylic family has been explored to enable a more sustainable use of these polymer materials in the medical and veterinary science field. The individual contributions of each comonomer have been analyzed, the reaction conversion has been studied via gas chromatography (GC), the rheological behavior has been characterized via stress-controlled measurements, and the final mechanical properties have been obtained from tensile, flexure, and impact tests. The GC results allow assessing the pot life and thus the working window of the casting process. For the rheological measurements, which start from low-viscous mixtures, a novel protocol has been introduced to obtain accurate absolute data. The rheological data reflect the time dependencies of the GC data but facilitate a more direct link with the macroscopic material data. Specifically, the steep increase in the viscosity with increasing reaction time for the methyl methacrylate (MMA)/ethylene glycol dimethyl methacrylate (EGDMA) case (2% crosslinker) allows maximizing several mechanical properties: the tensile/flexure modulus, the tensile/flexure stress at break, and the impact strength. This opens the pathway to more dedicated chemistry design for corrosion casting and polyacrylic material design in general.

The Effect of Degassing Pressure Casting Molds on the Quality of Pressure Casting

2012 ◽  
Vol 428 ◽  
pp. 43-46 ◽  
Author(s):  
Stefan Gaspar ◽  
Jozef Maščeník ◽  
Ján Pasko
Keyword(s):  
Rapid Development ◽  
Mold Cavity ◽  
Pressure Casting ◽  
Technological Parameters ◽  
Casting Technology ◽  
Internal Homogeneity ◽  
The Impact ◽  
Casting Production

In these days in foundry branch there is a rapid development of sectors of special casting technology with the aim to increase the quality and the efficiency of pressure casting production.. Internal homogeneity of pressure casting, characterized by the extent of porosity can be affected by the setup of technological parameters of pressure casting and last but not least by vacuuming the molds, that means to exhaust air and gases from the mold cavity. Contribution is specifically aimed on the analyzing the impact of degassing pressure molds on the porosity of pressure casting.

scholarly journals Comparative Evaluation of Marking Methods on Cast Parts of Al–Si Alloy with Image Processing

2021 ◽  
Author(s):  
Fangtian Deng ◽  
Rui Li ◽  
Steffen Klan ◽  
Wolfram Volk
Keyword(s):  
Image Processing ◽  
Medium Size ◽  
Cast Part ◽  
Laser Marking ◽  
Traceability System ◽  
Surface Topographies ◽  
The Individual ◽  
Pressure Die Casting ◽  
Cast Parts

AbstractQuality issues caused by casting defects are commonly complicated to solve, because the part-specific process parameters are not traced to the individual cast part. This problem can be mitigated by the traceability of each cast part with an identifier code. Therefore, a study of the influence of marked surface topography and post-treatments on code symbol quality is desirable for a well-designed traceability system. In this work, the code symbol quality of laser, dot peen, and electrolytic marking methods on three as-cast surfaces of Al–Si alloy, after sandblasting and heat treatment, is evaluated comparatively with a customized image processing software. The result shows that the laser marking method produces the highest performance for different as-cast surfaces; electrolytic marking provides acceptable results only on the smooth surfaces of high-pressure die casting; dot peen marking produces the codes of high symbol contrasts, which are similar to those of laser marking, especially for rough as-cast surfaces of sand casting. However, for all marking methods, the code qualities of all surface topographies decrease substantially after post-treatments. Considering that dot peen marking has satisfying performances as well as low equipment and maintenance costs, this method is more suitable for small- and medium-size foundries to start to trace each cast part in an economical manner.

scholarly journals IMPREGNATION OF POROUS METAL CASTING WITH POLYMER COMPOSITIONS: CURRENT TRENDS

2020 ◽  
pp. 55-61
Author(s):  
I. O. Leushin ◽  
A. U. Subbotin ◽  
D. A. Gorokhov
Keyword(s):  
Block Diagram ◽  
Practical Interest ◽  
Porous Metal ◽  
Polymer Materials ◽  
Current Trends ◽  
Impregnating Compound ◽  
Sealing Materials ◽  
Cast Parts

Modern sealing materials for impregnation of cast parts are considered, as well as types of casting defects that require such processing. The block diagram of impregnation is given, its operations are described. A classification of modern methods of impregnation of castings with polymer materials is proposed, and the results of their comparative evaluation are presented. The most practical interest among manufacturers is the method of impregnation «wet vacuum / pressure» in combination with the use of the impregnating composition Loctite Resinol 88 C. This is due to the best combination of price and quality of the sealant, as well as the fact that this impregnating compound can withstand the highest temperature (250 °C) compared to its analogues and is characterized by the lowest consumption when processing products (1.5 g/kg).

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