Effect of Friction conditions on Material Flow in FE Analysis of Al Piston Forging Process

Lee, Seong-Won; Jo, Jae-Wan; Joun, Man Soo; Lee, Jungmin

doi:10.1007/s12541-019-00189-8

Cited by 14 publications

(7 citation statements)

References 13 publications

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“…It was also observed that clean workpieces with prelubricated tools gave lower friction coefficient than the use of lubricated workpieces without intermediate cleaning. Lee et al [ 77 ] investigated about the effect of machined, cut, and shot peened forged specimens on friction, and it was observed that friction is highly dependent on effective strain, and out of the three specimens, shot peened specimen, due to its surface roughness, improved the uniformity and amount of lubricant over the deformed material during the process of forging. Pang et al [ 78 ] prepared a lubricant by mixing of SiO 2 nanoparticles in base oil with the help of hydrodynamic cavitation process, which was able to disperse nanoparticles uniformly in the base oil and the lubricant provided 14% improvement in lubrication during experiments.The various lubricants that are used in forging processes for reduction of friction and wear of forging tools are summarized in Table 1 with their description and applications.…”

Section: Methodsmentioning

confidence: 99%

A Systematic Review of Factors Affecting the Process Parameters and Various Measurement Techniques in Forging Processes

Sharma

Gupta

et al. 2023

steel research int.

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Forging is a primary manufacturing process used in several manufacturing industries. Aircraft and automobile industries are manufacturing products with high‐dimensional accuracy and quality that are highly precise or near the required shape. Customers require products that are free of cracks and fulfill their functional requirements. This leads to the advancement of the forging process due to its ability to form complicated and intricate shapes. Herein, a detailed review of the aspects of forging is given in which the optimization of factors like preform design, forging conditions, workpiece dimensions, die design, lubricant properties, and thermal treatment parameters are discussed, enhancing the tool life and forging quality of the product. The selection of die‐forging tool material and methods for enhancing the surface quality of forged products are also reviewed. The article also presents methods for measurement of forging quality, tool life, machine effectiveness, forging image acquisition, and forging parameters, which can significantly reduce the risk of error at every step of the forging process. This review serves as a reference for researchers to increase production rate, enhance the effectiveness of measurement system, and improve the quality of forged products with technological advancement.

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Section: Methodsmentioning

confidence: 99%

A Systematic Review of Factors Affecting the Process Parameters and Various Measurement Techniques in Forging Processes

Sharma

Gupta

et al. 2023

steel research int.

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“…The dashed curves in Figure 2 , the predicted CLSCs, were obtained using a rigid-thermoviscoplastic finite element method [ 33 , 37 ] with the fitted RFCs–BFTCs and the thermal material properties and process conditions found from the reference [ 33 , 38 , 39 ]. Notably, the difference between the experimental and predicted CLSCs is relatively tiny compared to the Ti-6Al-4V and AZ80A alloys [ 8 , 32 ], even though a distinct difference exists.…”

Section: Friction and Temperature Compensationmentioning

confidence: 99%

Accurate Flow Characterization of A6082 for Precision Simulation of a Hot Metal Forming Process

Park

Choi³

et al. 2022

Materials

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The flow behaviors of metallic materials are sensitive to state variables, including strain, strain rate, and temperature. In particular, the temperature effect on the flow behavior is of great importance. The flow information is usually obtained at the sample strain rates and temperatures from the hot cylinder compression test. However, this test is inevitably exposed to undesirable effects of friction and temperature on flow characterization. This study reveals their impact on the flow curve of an A6082 alloy. The unique features of its flow behavior and the inaccuracy of as-received, primitive flow information are emphasized. Using a systematic way of correcting the friction and temperature effects, the flow curves with high accuracy in terms of the compression load–stroke curve obtained from the test are calculated. It was revealed that the both the friction and temperature compensation of the primitive flow curves bring a minor change in the flow curves of the A6082 alloy, which is quite different from other commercial light metals. This phenomenon caused by the unique features of the flow behavior of the A6082 or other aluminum alloys will be critical to solving various process and quality matters confronted by the engineers in the hot metal forming industry.

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“…It can decompose to form a tribochemical film containing MoS 2 on the worn surface, which can effectively reduce friction and wear between friction pairs [18][19][20][21]. However, with the development trend of low-viscosity gear oil, the range of hybrid lubrication and boundary lubrication is constantly expanding in the operation of mechanical systems [22,23], making it increasingly difficult to use MoDTC alone, to meet the needs of high-performance gear oil. In order to solve this problem, friction modifiers and antiwear additives are mixed into low-viscosity gear oil to obtain improved tribological properties.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effect of Acrylate of Dialkyl Dithiophosphoric Acid Combined with Molybdenum Dialkyl Dithiocarbamate as Additives in Gear Oil

Ding,

Mo,

Zhang

et al. 2024

Lubricants

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With the aim of improving the tribological properties of low-viscosity gear oil for automobiles, an acrylate of dialkyl dithiophosphoric acid (ADDP) with strong polar groups was synthesized. The tribological behavior of ADDP combined with molybdenum dialkyl dithiocarbamate (MoDTC) in gear oil was systematically studied. Tribological performances of gear oil containing different additives were assessed using a four-ball friction and wear tester. The obtained tribological characteristics reveal that ADDP and MoDTC can significantly improve the antiwear and antifriction performance of low-viscosity gear oil. Moreover, compared with using MoDTC or ADDP alone, the average friction coefficient and wear scar diameter of ADDP combined with MoDTC further decreased by 2.41–19.15% and 5.00–18.19%, respectively. Analysis of the worn surface showed that the structural characteristics and physical synergistic lubricating actions of the ADDP with MoDTC additives during the friction process can contribute to the exceptional tribological properties of the hybrid additives.

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Effect of Friction conditions on Material Flow in FE Analysis of Al Piston Forging Process

Cited by 14 publications

References 13 publications

A Systematic Review of Factors Affecting the Process Parameters and Various Measurement Techniques in Forging Processes

A Systematic Review of Factors Affecting the Process Parameters and Various Measurement Techniques in Forging Processes

Accurate Flow Characterization of A6082 for Precision Simulation of a Hot Metal Forming Process

Synergistic Effect of Acrylate of Dialkyl Dithiophosphoric Acid Combined with Molybdenum Dialkyl Dithiocarbamate as Additives in Gear Oil

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