scholarly journals Effect of friction conditions on change of sheet surface roughness during deep drawing

2013 ◽  
Vol 30 (85(4/2013)) ◽  
pp. 375-386
Author(s):  
Anna Bazan ◽  
Tomasz Trzepieciński
Keyword(s):  
Surface Roughness ◽  
Deep Drawing ◽  
Sheet Surface

Formability of AZ31 Magnesium Alloy Sheet in Dry Press Forming Using Diamond-Coated Dies

2009 ◽  
Author(s):  
S. Tsuda ◽  
S. Yoshihara ◽  
S. Kataoka
Keyword(s):  
Surface Roughness ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Deep Drawing ◽  
Chemical Vapor ◽  
Alloy Sheet ◽  
Az31 Magnesium Alloy ◽  
Specific Strength ◽  
Press Forming ◽  
Forming Tools

Dry press forming which hasn’t used lubricants in the process is the attractive forming technique of zero emission for the lubricants. As one of the dry press forming techniques, the usage of dies coated with a chemical vapor deposition (CVD) diamond film, which are expected to be applied to forming tools owing to their high tribological properties, abrasion resistance and heat resistance, has been proposed. Magnesium alloys have attracted attention owing to their advantages over what such as, high specific strength and ease of recycling. However, they have intractable characteristics, and it is necessary to perform the forming technique at high temperature and to consider lubrication condition. In this study, diamond-coated dies were used in the deformation of magnesium alloy sheets without lubricants in press forming, and the formability of magnesium alloy and its effect on the surface texture of a formed-cup were investigated. Dry deep-drawing tests and dry ironing tests were carried out to estimate the effect of the diamond-coated dies on the formability of magnesium alloy sheets. Furthermore, the formability obtained using the above-mentioned tests was compared with that obtained in tests using non-lubricant dies with traditional lubricant. AZ31 magnesium alloy sheets (thickness: t0 = 0.5 mm) were deformed at 200 °C in dry deep-drawing tests. From the results, it was found that what can be deformed using diamond-coated dies. Moreover, a 20% reduction in drawing force was confirmed compared with the usage of the traditional lubricant (MoS2). Meanwhile, dry ironing tests were performed under conditions of 10% ironing ratio by a method similar to the dry deep-drawing tests. In general, the ironing process, which is the most difficult step in lubrication in sheet forming, has been enabled by the diamond coating technique. Furthermore, it was observed that the surface roughness of the formed-cup walls using the diamond-coated dies was 0.4 μmRz, and, 1.3 μmRz in case of MoS2. It was confirmed that the application of diamond-coated dies improved the surface roughness of the formed-cup. It produced an improvement in the formability of magnesium alloys compared with the traditional lubrication technique (use of MoS2). It was concluded that the validity of the use of diamond-coated dies became clear.

Study on Mould Structure of Differential Temperature Drawing Process for Magnesium Alloy

2011 ◽  
Vol 403-408 ◽  
pp. 4360-4363
Author(s):  
Zu Jian Yu ◽  
Jian Hui Li
Keyword(s):  
Surface Roughness ◽  
Magnesium Alloy ◽  
Stress Distribution ◽  
Deep Drawing ◽  
Cooling Water ◽  
Alloy Sheet ◽  
Drawing Process ◽  
Az31b Magnesium Alloy ◽  
Magnesium Alloy Sheet ◽  
Structure Surface

Magnesium alloy, differential temperature drawing, mould structure, surface roughness Abstract. To improve the formability of magnesium alloy sheet, the differential temperature drawing process was presented, and the mould structure of differential temperature drawing process for magnesium alloy was well-designed and fabricated by analyzing the friction and the stress distribution of material in drawing process. With the blank heated to 200-235°C at the flange by inserting heating coils and thermocouples in die and binder and the drawn cup cooled by injecting cooling water into die and punch, the differential temperature drawing process of magnesium alloy sheet was performed successfully and the value of surface roughness Ra1.6um was adopted for punch, Ra0.4um was adopted for die and binder. The result shows that by using the designed mould, the deep drawing performance of AZ31B magnesium alloy can be enhanced obviously and the value of LDR can be increased form 2.1 to 3.05.

Deep Drawing Steel Sheet Surface Quality

JOM ◽  
1953 ◽  
Vol 5 (5) ◽  
pp. 630-631
Author(s):  
R. J. Walter
Keyword(s):  
Surface Quality ◽  
Deep Drawing ◽  
Steel Sheet ◽  
Sheet Surface

Aluminum sheet surface roughness correlation with adhesion in polymer metal hybrid overmolding

CIRP Annals ◽  
2011 ◽  
Vol 60 (1) ◽  
pp. 559-562 ◽  
Author(s):  
G. Lucchetta ◽  
F. Marinello ◽  
P.F. Bariani
Keyword(s):  
Surface Roughness ◽  
Aluminum Sheet ◽  
Sheet Surface ◽  
Polymer Metal

The Effect of Lubricants and Material Properties in Surface Roughness and Formability for Single Point Incremental Forming Process

2014 ◽  
Vol 979 ◽  
pp. 359-362
Author(s):  
Nuttaphong Sornsuwit ◽  
Sunthorn Sittisakuljaroen
Keyword(s):  
Surface Roughness ◽  
Adhesive Wear ◽  
Incremental Forming ◽  
Single Point ◽  
Single Point Incremental Forming ◽  
Forming Process ◽  
Sheet Surface ◽  
Air Blowing ◽  
Asymmetric Shape ◽  
High Roughness

The single point incremental forming (SPIF) is a manufacturing process which allows small batch and asymmetric shape fabrication. The research focuses on its applications by consider surface roughness and formability. The surface roughness of specimen was resulted by the influence obtained between tool and specimen, where the lubricant played a significant role during the forming process, as well as material elongation as a mechanical property governed the formability of metal sheet. Surface roughness tester, SEM, EDS and profilometer were used for the characterizations. The results showed that low roughness value (Ra) of SUS 304 and SUS 316L obtained by applying air blowing as a lubricant, while Ti Gr2 could obtain low roughness by using MoS2. The behavior of wear was an adhesive wear which transfer to an abrasive wear. SUS 304 and SUS 316L sheet of test specimens achieved higher depth in forming by air lubricant and MoS2, and Ti Gr2 sheet revealed a better formability with MoS2. Furthermore, the highest depth was correlated with high roughness value for each material.

Thickness Distribution in Conical Parts Formed by Hydroforming and Conventional Multistage Deep Drawing Processes

2011 ◽  
Vol 189-193 ◽  
pp. 2884-2887
Author(s):  
Abdolhamid Gorji ◽  
Amir Reza Yaghoubi ◽  
Mohammad Bakhshi-Jooybari ◽  
Salman Norouzi
Keyword(s):  
Deep Drawing ◽  
Metal Forming ◽  
Thickness Distribution ◽  
Pure Copper ◽  
Experimental Program ◽  
Drawing Process ◽  
Blank Holder ◽  
Sheet Surface ◽  
Two Stages ◽  
Explosive Forming

Forming conical parts is one of the difficult fields in sheet metal forming processes. Because of low contact area of the sheet with the punch in the initial stages of forming, too much tension applied to the sheet that it causes bursting. Furthermore, since the major part of the sheet surface between the blank holder and punch tip is free, wrinkles appears on the wall of the drawn parts. These parts are normally formed in industry by processes such as spinning, explosive forming or multistage deep drawing. Hydroforming deep drawing is one of the special deep drawing processes which have been introduced in order to overcome some inherent problems in the conventional deep drawing with rigid tools. In the present work, an experimental program has been carried out to form and compare the forming pure copper conical-cylindrical cups by hydroforming and conventional multistage deep drawing processes. The conical parts in conventional deep drawing process formed in two stages. The results of the study demonstrate that thickness distribution are more uniform in the parts formed by hydroforming compared to conventional multi stages deep drawing processes.

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