Investigations on dimensional accuracy of the components prepared by hybrid investment casting

2015 ◽  
Vol 20 ◽  
pp. 525-533 ◽  
Author(s):  
Parlad Kumar ◽  
Rupinder Singh ◽  
I.P.S. Ahuja
Keyword(s):  
Investment Casting ◽  
Dimensional Accuracy

Digital Manufacturing of Implant Based Dental Restorations

2008 ◽  
Author(s):  
Ming C. Leu ◽  
Parthiban Delli
Keyword(s):  
Investment Casting ◽  
Dimensional Accuracy ◽  
Digital Manufacturing ◽  
Cnc Milling ◽  
Dental Restorations ◽  
Human Labor ◽  
Cad Cam ◽  
Cad Models ◽  
Direct Digital Manufacturing ◽  
Cam Systems

Traditional methods of producing dental bars for overdentures involve tedious and time-consuming operations that demand substantial human labor and demanding skills. Though there exist several CAD/CAM systems that have been developed for various dental restorations like bridges, crowns, etc., there exists no commercial CAD/CAM system at present for design and fabrication of dental restorations for missing multiple teeth. In the research described in the present paper, CAD models of dental bars for implant-retained dental restorations were used as input for three types of fabrication processes: rapid prototyping followed by investment casting, CNC milling, and direct digital manufacturing. Details of material and process combinations and results of comparing these three types of processes, including an analysis on dimensional accuracy, are discussed.

Investigations for Mechanical Properties of Hybrid Investment Casting: A Case Study

2014 ◽  
Vol 808 ◽  
pp. 89-95 ◽  
Author(s):  
Parlad Kumar ◽  
Rupinder Singh ◽  
I.P.S. Ahuja
Keyword(s):  
Investment Casting ◽  
Fused Deposition Modeling ◽  
Dimensional Accuracy ◽  
Casting Process ◽  
Manufacturing Processes ◽  
Biomedical Implant ◽  
Fused Deposition ◽  
Deposition Modeling ◽  
Investment Casting Process

Conventional investment casting is one of the old manufacturing processes. It involves expensive tooling for making sacrificial wax patterns to make ceramic moulds. However, with the emergence of rapid prototyping technologies, now it is possible to make and use plastic patterns instead of wax patterns along with some advantages. In this paper, plastic patterns have been prepared by using fused deposition modeling and used for investment casting process. A case study has been discussed to make a biomedical implant by the hybridization of fused deposition modeling with investment casting. Dimensional accuracy, surface finish and hardness of the casted biomedical implants have been tested and reported.

Evaluation of Direct Rapid Prototyping Pattern for Investment Casting

2012 ◽  
Vol 463-464 ◽  
pp. 226-233 ◽  
Author(s):  
M.F.M. Omar ◽  
S. Sharif ◽  
M. Ibrahim ◽  
H. Hehsan ◽  
M.N.M. Busari ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Rapid Prototyping ◽  
Investment Casting ◽  
Fused Deposition Modeling ◽  
Ceramic Powder ◽  
Dimensional Accuracy ◽  
Fused Deposition ◽  
Rp Process ◽  
Burn Out ◽  
Quality Assessments

The ability of rapid prototyping (RP) technology to fabricate direct part of any complex shape as a sacrificial pattern in shorter lead time has benefited the foundry industries significantly. The quality of investment casting (IC) parts is directly related to the master pattern fabricated from RP process. The main objective of this study was to evaluate the quality characteristics of various RP patterns that were fabricated by various RP processes which include 3D Printer (3DP), Fused Deposition Modeling (FDM) and Multijet Modeling (MJM). Evaluation of the RP patterns was carried out on dimensional accuracy, surface roughness and pattern shrinkage. Different internal pattern designs for the RP parts were developed using Insight software for FDM process and Solidworks 2011 for other RP systems. In addition to the quality assessments, the effect of the internal pattern designs on the burn out behaviour of the RP patterns was also evaluated. Experimental results showed that FDM and MJM produced patterns with better accuracy, surface roughness and part shrinkage when compared to 3DP. It was evident that the internal pattern structure improved the accuracy of the patterns produced from all RP processes. Results showed that FDM and MJM processes were superior in terms of mold cleanliness when no residual ash was observed during the burn out stage. Significant oxidation of ceramic powder was observed on the molds of the 3DP patterns which need to be removed manually from the molds.

Dimensional Tolerance of Casting in the Bridgman Furnace Based on 3D Printing Techniques

Metals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 299
Author(s):  
Xintao Zhu ◽  
Fu Wang ◽  
Dexin Ma ◽  
Andreas Bührig-Polaczek
Keyword(s):  
3D Printing ◽  
Investment Casting ◽  
Systematic Approach ◽  
Low Cost ◽  
Coordinate Measuring Machine ◽  
Dimensional Accuracy ◽  
Metal Casting ◽  
Measuring Machine ◽  
Printing Techniques ◽  
Short Times

In this article, the feasibility and the dimensional accuracy based on the 3D printing technology during investment casting of non-vacuum and Bridgman furnace are investigated based on the coordinate measuring machine to calculate the dimensional tolerances through a systematic approach. The research proved that both the investigated RC solutions are effective at obtaining cast technological prototypes in short times and at low cost, with dimensional tolerances that are completely consistent with metal casting processes.

A Study on the Shrinkage Characteristics and Dimensional Accuracy of Cast Gears

1992 ◽  
Author(s):  
Jimmy Adjunta ◽  
Donald Houser
Keyword(s):  
Investment Casting ◽  
Coordinate Measuring Machine ◽  
Dimensional Accuracy ◽  
Machining Process ◽  
Spur Gears ◽  
Design Phase ◽  
Process Variables ◽  
Measuring Machine ◽  
Thickness Measurements

Abstract This paper is primarily concerned with the evaluation of the dimensional quality of spur gears produced by two casting processes, i. e., the investment casting and v-sand casting processes. The casting patterns used were designed by compensating for process shrinkage, and were manufactured using a flexible CNC gear machining process. A computer program, CASTGR, was written to facilitate the design phase of the patterns. The various gear configurations cast were inspected using an universal coordinate measuring machine. The geometry of the casting and pattern were correlated to verify the contraction characteristics of the gear castings. In an attempt to categorize the precision capabilities of the two casting processes, the spread of the deviations found for tooth thickness measurements and measurements along profiles and leads of the cast gears were examined. The observed effects of other process variables is also included.

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