MOD patterns are distorted by expansion of the investment during setting in the casting ring. Using a simple idealized epoxy resin MOD pattern and two-dimensional photoelasticity, this investigation reports the distortion under several conditions, including W/P ratios, cases with and without asbestos lining, number of asbestos layers, condition of the asbestos lining (dry, wet, and applied sili...

The performance characteristics of a truss core sandwich panel design based on the 3D Kagom e has been measured and compared with earlier simulations. Panels have been fabricated by investment casting and tested in compression, shear and bending. The isotropic nature of this core design has been confirmed. The superior performance relative to truss designs based on the tetrahedron has been demo...

γTiAl based alloys are very attractive for structural applications at high temperatures. The addition to the selected alloy of dispersed alumina particles increases yield strength and elastic modulus but affects their fracture behavior by favoring propagation brittle fracture. analysis surface revealed that oxide particle, during component production means investment casting, favors intensifyin...

Today, a number of direct routes using RP processes (FDM, LOM, SLA, SLS, etc.), as well as indirect routes (RP coupled with secondary or soft-tooling processes like RTV vacuum casting) are available for rapid fabrication of tooling for sand and investment casting processes. Each route is unique in terms of geometric, material, quality and cost characteristics; no comprehensive database of their...

Indigenous product development using conventional means involves a relatively long lead-time and cost, especially for replacing worn-out and broken parts. This paper presents methodologies and technologies for computer-aided reverse engineering, illustrated by a real-life case study of an aluminium-alloy separator body of a hydraulic filter assembly for a special army vehicle. It involved recon...

Manufacturing of aero-engine components has been improvised over the years, commensurate with technological developments in the aeronautics sector. Compressor blade plays a vital role in an aircraft engine and flaws in its production can have adverse impacts on the performance of an aero engine. Despite technological advancements, many defects arise in these single crystal blades, which are man...

Originally developed by NASA as high performance piston alloys to meet U.S. automotive legislation requiring low exhaust emission, the novel NASA alloys now offer dramatic increase in tensile strength for many other applications at elevated temperatures from 450°F (232°C) to about 750°F (400°C). It is an ideal low cost material for cast automotive components such as pistons, cylinder heads, cyl...

A study is conducted on the state-of-the-art manufacturing practices of conventional industrial and research-and-development (R&D) firms manufacturing electric induction motors. It is found that current industrial processes cannot produce high-performance motors, and that current R&D processes are too costly. A new manufacturing process for fabricating the rotors of squirrel cage induction moto...

This study aimed to develop a dental investment for titanium casting. ZrO(2) and Al(2)O(3) were selected as refractory materials to prepare three investments (Codes: A-C) according to the quantity of Zr. Al(2)O(3) cement was used as a binder at a ratio of 15%, they were mixed with special mixing liquid. B1 was used as a control mixed with water. Fundamental examinations were statistically evalu...

Dimensional accuracy and geometric characteristics of the manufactured parts bear significant importance in product assembly. In Rapid Investment Casting, these can be affected by printing parameters Additive Manufacturing method used pattern production process. Stereolithography is one important AM techniques mostly exploited RIC due to its accuracy, smooth surface, precision. However, effect ...