scholarly journals Experimental Assessment of a 3D-Printed Stainless Steel Gas Foil Bearing

2020 ◽  
Vol 142 (8) ◽  
Author(s):  
Karim Shalash ◽  
Jürg Schiffmann
Keyword(s):  
Stainless Steel ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
High Speed ◽  
Disruptive Technology ◽  
Compliant Structure ◽  
Design Creativity ◽  
Foil Bearing ◽  
3D Printed

Abstract Gas foil bearings (GFBs) are a key enabling technology for high-speed turbomachinery. The manufacturing of GFBs relies mainly on sheet metal forming techniques in order to conceive the compliant structure (e.g., bump foil) and the top foil. Such techniques require the development of a special know-how and most importantly, limit the design creativity to what is manufacturable using sheet metal forming. Additive manufacturing (AM) is a disruptive technology in prototyping and fabrication. This paper accesses the feasibility of AM in the fabrication of GFBs using selective laser melting (SLM) technology. A stainless steel GFB is 3D-printed in one piece, including the sleeve, the bump, and top foils. The bearing is assessed geometrically and statically before being tested on a gas bearing test rig, where it supported a ø40 mm rotor (m = 2 kg). The bearing performed similar to a conventional GFB, showing rotordynamically stable and repeatable operation up to 37.5 krpm. Such result highlights the potentials of AM as a viable alternative for foil bearing manufacturing.

APPLICATION OF 3D PRINTING TECHNOLOGY FOR RAPID TOOLING IN SHEET METAL FORMING

2020 ◽  
Vol 3 ◽  
pp. 20-30
Author(s):  
M.A. SEREZHKIN ◽  
D.O. KLIMYUK ◽  
A.I. PLOKHIKH
Keyword(s):  
3D Printing ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Rapid Tooling ◽  
Printing Technology ◽  
3D Printing Technology ◽  
3D Printed ◽  
Printed Materials ◽  
Printing Parameters

The article presents the study of the application of 3D printing technology for rapid tooling in sheet metal forming for custom or small–lot manufacturing. The main issue of the usage of 3D printing technology for die tooling was discovered. It is proposed to use the method of mathematical modelling to investigate how the printing parameters affect the compressive strength of FDM 3D–printed parts. Using expert research methods, the printing parameters most strongly affecting the strength of products were identified for further experiments. A method for testing the strength of 3D–printed materials has been developed and tested.

Springback in Sheet Metal Forming of Stainless Steel 410

2010 ◽  
Author(s):  
Ihab Ragai ◽  
James A. Nemes
Keyword(s):  
Stainless Steel ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Aircraft Engine ◽  
Thickness Variation ◽  
Element Simulation ◽  
Series Of Experiments ◽  
Formed Part ◽  
Geometrical Defects

This paper considers the use of finite element simulation of sheet metal forming as a tool to evaluate geometrical defects caused by elastic springback. The simulations aim to provide reliable information about the deviation of the real part geometry from that defined in the design phase in order to overcome the subsequent assembly problems. The material studied and presented in this paper is stainless steel 410. In order to determine the material properties and the parameters needed for the simulations, a series of experiments including uniaxial and cyclic tests were carried out. Moreover, bending experiments were conducted so that simulation results can be verified against simple forming operations. To expand the use of the model to predict the effect of forming parameters on springback, an aircraft engine cone-shaped component was simulated and the results were compared to the actual formed part. Predictions of the final shape and thickness variation were successfully obtained and were in agreement with the cone forming experiments.

Analysis of Dynamic Loads on the Dies in High Speed Sheet Metal Forming Processes

2014 ◽  
Vol 23 (5) ◽  
pp. 1759-1769 ◽  
Author(s):  
R. Ibrahim ◽  
S. Golovashchenko ◽  
L. M. Smith ◽  
A. Mamutov ◽  
J. Bonnen ◽  
...  
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
High Speed ◽  
Dynamic Loads

Incorporation of the strain-rate-sensitive constitutive relations in the analysis of sheet metal forming

1990 ◽  
Vol 25 (1) ◽  
pp. 15-20 ◽  
Author(s):  
C H Toh
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
High Speed ◽  
Constitutive Relations ◽  
Sheet Material ◽  
The Finite Element Method ◽  
Thickness Strain ◽  
High Speed Forming ◽  
Hemispherical Punch

Two forms of rate-sensitive constitutive equations, additive and multiplicative, are examined in the analysis of sheet metal forming using the finite element method. Results are obtained for hemispherical punch stretching of an AK steel sheet material with various punch speeds. The computed results in thickness strain distributions and load-displacement curves are almost identical for the two constitutive laws at a low punch speed. However, the additive law provides better agreement in the thickness strain distributions with the experimental trends for high-speed forming.

Sign in / Sign up

Export Citation Format

Share Document