Eventos Anais de eventos
COBEF 2021
11th Brazilian Congress on Manufacturing Engineering
A BRIEF STUDY OF LUBRICATION AND ROTATION INFLUENCE ON THE FORMABILITY IN SINGLE-POINT INCREMENTAL FORMING OF ASTM A653 CS-A STEEL
Submission Author:
Manolo Lutero Gipiela , PR , Brazil
Co-Authors:
Paulo Sergio Olivio Filho, Claudimir Rebeyka, Manolo Lutero Gipiela, Pablo Deivid Valle, Paulo Victor Prestes Marcondes
Presenter: Paulo Sergio Olivio Filho
doi://10.26678/ABCM.COBEF2021.COB21-0283
Abstract
Single Point Incremental forming (SPIF) is a free forming process of sheet parts in a specific equipment like CNC machining centers or special hexapod robots. It stands out for its high formability and low production cost, being ideal for prototypes and small batches. The main design parameters are the wall angle, material and sheet thickness and, most of the cases, they cannot be modified or even adjusted to improve the manufacturing performance. On the other hand, the main process parameters that impact the product total quality are tool rotation, vertical step size, lubrication and all of them can be continuously optimized. Thus, these last three process parameters are widely investigated in several kinds of research. This study investigates the influence of the lubrication on incremental forming applying different tool rotation when shaping a truncated cone of ASTM A653 CS-A steel sheets - 0.43mm thick - with different types of lubrication and vertical step size. It was chosen three level for each factor: 600, 1200 and 1800rpm for tool rotation n; 0.6, 0.8 and 1.0mm for vertical step size Δz and dry, mineral oil and molybdenum disulfide grease for lubrication condition. The statistic Taguchi method was applied to evaluate the maximum depth of forming and better surface quality (roughness Ra). The results confirmed the use of mineral oil as the most predominant factor in the process for minimum roughness, maximum forming height. The rotation found that contributed for best forming results was 600 rpm.
Keywords
SPIF, ASTM A653 CS-A, lubrication, Rotation, step size
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