Effect of friction coefficient in deep drawing of AA6111 sheet at elevated temperatures

Ma, Wan-Chun; Wang, Baoyu; Fu, Lei; Zhou, Jing; Huang, Ming-dong

doi:10.1016/s1003-6326(15)63849-3

Cited by 43 publications

(16 citation statements)

References 25 publications

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“…The unified viscoplastic constitutive equations were developed to predict flow stress and microstructure evolution for many types of metal materials [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40]. Recovery, recrystallization, grain size, and dislocation density were well described in the framework of the unified viscoplastic constitutive model.…”

Section: Constitutive Equations and Microstructural Model Of 21-4nmentioning

confidence: 99%

Predicting the Microstructure of a Valve Head during the Hot Forging of Steel 21-4N

Huang

et al. 2018

Metals

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Abstract:Valve microstructure is important during hot forging. Austenitic 21-4N steel is often used in exhaust valves. In this study, the microstructure evolution of the forging valve process was predicted using the internal state variables (i.e., average grain size, recrystallized fraction, and dislocation density) modus for 21-4N. First, 21-4N was subjected to hot compression tests on a Gleeble-1500D and static grain growth tests in a heating furnace. A set of uniform viscoplastic constitutive equations was established based on experimental data. Next, the determined unified constitutive equations were conducted in DEFORM-3D, and the microstructure evolution of 21-4N during forging was calculated. Finally, the simulation results of grain size evolution were validated via experiments. Results showed good consistency between the simulations and experiments. Thus, the models adequately predicted the microstructure evolution.

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Section: Constitutive Equations and Microstructural Model Of 21-4nmentioning

confidence: 99%

Predicting the Microstructure of a Valve Head during the Hot Forging of Steel 21-4N

Huang

et al. 2018

Metals

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“…4. In these experiments, a friction coefficient of 0.15 was selected [12]. An 11-layered elastic element was employed.…”

Section: Virtual Environment and Real Environment Experiments Indepenmentioning

confidence: 99%

Development of car wishbone using sheet metal tearing process via the theory of inventive problem-solving (TRIZ) method

Şen

Baykal²

2019

J Braz. Soc. Mech. Sci. Eng.

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In the automotive industry, sheet metal forming process design is of great importance. The cold forming process in particular is the most widely preferred of these methods. In the production of car parts in complex forms, forming problems such as tearing, wrinkling, back spring and unwanted thinning can appear. Recently, numerical analysis technology and software tools have been widely used in process design and metal forming. Elimination of these problems without the use of analysis programs means the use of the trial and error method, which results in much wasted time and huge costs. In addition to the use of analysis programs, resolving problems without mold process and design knowledge is also problematic. In this study, the theory of inventive problem-solving (TRIZ) approach was utilized to reach an analytical solution. In this methodology, the improving and worsening features were determined and a TRIZ 39 × 39 contradiction matrix was created which led to the solutions. Virtual experiments were carried out on a wishbone mold model designed via the Siemens NX 12 CAD program using the Autoform R7 analysis program. Real environment experiments were then performed, and the problem of tearing during the forming process was eliminated. The measured thickness value of this area, which was formed without tearing, was measured as 2.7 mm in the virtual environment experiments and 2.9 mm in the real environment experiments. In addition, the wishbone was subjected to two-axis (x and z) dynamic testing, with acceptable values reached at 500,000 cycles.

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“…Due to inadequate and improper lubrication condition, defects such as thinning, tearing and scratching are generated. Ma et al 16 investigated the effect of friction coefficient in deep drawing of aluminium alloy AA6111 sheet at elevated temperature. The numerical analysis and experimental tests were carried out on the basis of three different cases such as the effect of friction coefficient on thickness variation, friction coefficient between blank and punch and friction coefficient between the blank and blank holder (see Table 3).…”

Section: Thinning Effectmentioning

confidence: 99%

A review on effect of thinning, wrinkling and spring-back on deep drawing process

Babu

2018

Proceedings of the Institution of Mechanical Engineers, Part B:

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There are various processes practiced in a market for manufacturing axisymmetrical cup with significant forming depth among which deep drawing process is most prompt. The deep drawing process is a forming process with ongoing interest which will have a major impact on industries in coming years. This article focuses on the current status and potential of future development of technology in the deep drawing process. First, it describes various types of approaches and techniques used in the deep drawing of different materials. This is followed by brief reviews of advantages and limitations of these technologies with its application in industries. The details of these technologies are just referred rather than explaining in detail. The further part of this article focuses on advanced methods for predicting defects like thinning, wrinkling and spring-back in deep drawing process which are mostly responsible for rejection of the components. The opportunity in the development of flexibility in deep drawing process is covered with an observed barrier in the prediction of defects such as thinning, wrinkling and spring-back. The obtained evidence indicates that deep drawing process may not be applicable for all materials, but represents an excellent opportunity in the drawing of multilayer metal and composite material sheets to complex shapes.

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Effect of friction coefficient in deep drawing of AA6111 sheet at elevated temperatures

Cited by 43 publications

References 25 publications

Predicting the Microstructure of a Valve Head during the Hot Forging of Steel 21-4N

Predicting the Microstructure of a Valve Head during the Hot Forging of Steel 21-4N

Development of car wishbone using sheet metal tearing process via the theory of inventive problem-solving (TRIZ) method

A review on effect of thinning, wrinkling and spring-back on deep drawing process

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