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Number of results: 5
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Abstract

This research presents comprehensive assessment of the precision castings quality made in the Replicast CS process. The evaluation was

made based on quality of the surface layer, shape errors and the accuracy of the linear dimensions. Studies were carried out on the modern

equipment, among other things a Zeiss Calypso measuring machine and profilometer were used. Obtained results allowed comparing lost

wax process models and Replicast CS process.

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Authors and Affiliations

R. Biernacki
R. Haratym
M. Sieczka
J. Kwapisz
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Abstract

Dokra casting is famous for its Artistic value to the world but it is also sophisticated engineering. The technique is almost 4500 years old. It is practiced by the tribal artisans of India. It is a clay moulded wax-based thin-walled investment casting technique where liquid metal was poured into the red hot mould. Dimensional accuracy is always preferable for consumers of any product. Distortion is one of the barriers to achieving the accurate dimension for this type of casting especially for the bending parts. The cause and nature of the distortion for this type of casting must be analyzed to design a product with nominal tolerance and dimensional accuracy.
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Bibliography

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Authors and Affiliations

R. Mandal
1
S. Roy
2
ORCID: ORCID
S. Sarkar
1
T. Mandal
3
A.K. Pramanick
2
G. Majumdar
1

  1. Mechanical Engineering Department, Jadavpur University, India
  2. Metallurgical and Material Engineering Department, Jadavpur University, India
  3. Metallurgy and Materials Engineering, IIEST Shibpur, India
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Abstract

Variation in final casting dimensions is a major challenge in the investment casting industry. Additional correction operations such as die tool reworking as well as coining operations affect foundry productivity significantly. In this paper influence of basic parameters such as wax material, mould material, number of ceramic coats and feed location on the dimensional accuracy of stainless-steel casting has been investigated. Two levels of each factor were chosen for experimental study. Taguchi approach has been used to design the experiment and to identify the optimal condition of each parameter for reduced dimensional deviation. Analysis of variance has been carried out to determine the contribution of each process parameter. The result reports that selected parameters have significant effect on the dimensional variability of investment casting. Mould material is the dominant parameter with the largest contribution followed by number of ceramic coats and wax material whereas feed location is having negligible contribution.

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Authors and Affiliations

S.N. Bansode
V.M. Phalle
S. Mantha
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Abstract

The article presents the results of a comparative analysis of the metal substructure for dental prosthesis made from a Co-Cr-Mo-W alloy by

two techniques, i.e. precision investment casting and selective laser melting (SLM). It was found that the roughness of the raw surface of

the SLM sinter is higher than the roughness of the cast surface, which is compensated by the process of blast cleaning during metal

preparation for the application of a layer of porcelain. Castings have a dendritic structure, while SLM sinters are characterized by a

compact, fine-grain microstructure of the hardness higher by about 100 HV units. High performance and high costs of implementation the

SLM technology are the cause to use it for the purpose of many dental manufacturers under outsourcing rules. The result is a reduction in

manufacturing costs of the product associated with dental work time necessary to scan, designing and treatment of sinter compared with

the time needed to develop a substructure in wax, absorption in the refractory mass, casting, sand blasting and finishing. As a result of

market competition and low cost of materials, sinter costs decrease which brings the total costs related to the construction unit making

using the traditional method of casting, at far less commitment of time and greater predictability and consistent sinter quality.

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Authors and Affiliations

D. Myszka
M. Skrodzki
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Abstract

In this work, authors investigated the effect of the Depth of Field (DoF) reduction, arising when the acquisition of small objects is carried out with a photogrammetry-based system using a Digital Single Lens Reflex (DSLR) camera and the structure from motion (SfM) algorithm. This kind of measuring instrument is very promising for industrial metrology according to the paradigms of the fourth industrial revolution. However, when increasing the magnification level, necessary for the reconstruction of sub-millimetric features, there is a corresponding decrease of the DoF, leading to possible effects on the reconstruction accuracy. Thus, the effect of the DoF reduction was analysed through the reconstruction of a well-known artefact: the step gauge. The analysis was conducted considering the theory behind the DoF concept, the analysis of the 2D images, input of photogrammetric reconstruction and, finally, the results in terms of dimensional verification of the reconstructed step gauge.
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Authors and Affiliations

Maria Grazia Guerra
1
Luigi Maria Galantucci
1
Fulvio Lavecchia
1
Leonardo De Chiffre
2

  1. Politecnico di Bari, Department of Mechanics, Mathematics and Management, via E. Orabona 4, 70126 Bari, Italy
  2. Technical University of Denmark, Department of Mechanical Engineering, Produktionstorvet 425, DK-2800 Kgs. Lyngby, Denmark

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