Figure - available from: The International Journal of Advanced Manufacturing Technology
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Source publication
The shaving process has been regarded as one of the major solutions for preparing edges with precise dimensions in the sheet metal cutting industry. However, currently, the limitation of this process is the number of shaving operations, especially for thick metal sheets. When thicker sheet metal is shaved, more cutting operations are required, and...
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An analysis of change in the thickness of a hollow part obtained by plastic deformation was carried out in this article. It is noted that when deep drawing sheet metal, the thinning of the part walls can reach up to 12% of the initial thickness. At the same time, the increase in the thickness of the part walls during compression deformation reaches...
Citations
Of late, aluminum alloy sheets are being increasingly used in the fabrication of automotive, marine, and aircraft parts. Typically, a metal-forming process is used to produce these parts. However, the fracture-free cut surface characteristics of these parts are still limited by the die cutting process, and a secondary operation, such as machining, is needed to overcome this limitation. In this study, the use of cryogenic temperatures in press shaving was investigated. In the shearing operation, the cryogenic temperature influenced the ratios of the die-roll, smooth-surface, and fracture-to-material thickness, particularly for the fracture texture. Applying cryogenics in the shearing process increased the smoothness of the surface by approximately 50%, and the concave feature formed on the sheared workpiece was approximately 45% deep. Additionally, the hardness under cryogenic-temperature condition was approximately 15% higher than that at room temperature. However, the shearing force increased by approximately 30%. With the shaving operation, the volume of the shaving allowance was reduced owing to the deeper concave features. This resulted in a downward movement of the shaving allowance during the shaving operation, allowing easier sliding along the punch face and easier bending underneath the punch face. Consequently, tearing could be prevented, and the shearing phase of the shaving operation could be delayed. The results revealed that compared with the conventional press-shaving process, in which tearing and fracture of approximately 0.393 mm were generated, the application of cryogenic temperature to the press-shaving process delayed the tearing and prevented fracture, thereby achieving a fracture-free cut surface characteristic.
