Surface stresses and flow modes on contact surface in a combined double cup extrusion process

Lee, Ho Yong; Noh, Jung Ho; Hwang, Beong Bok

doi:10.1016/j.triboint.2013.03.018

Cited by 11 publications

(6 citation statements)

References 12 publications

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“…The open forging test, the extrusion test, and the closed forging test are the typical types of testing that are performed throughout the metal-forming process. These tests are well-known in the scientific community [105]. The most of the test methods involved the use of lubricant throughout the trial.…”

Section: Methods Approach and Analysismentioning

confidence: 99%

“…Extrusion is another method for producing metal that has been suggested by some researchers. Some of the types of approach extrusion processes are the double cup extrusion process, which Lee et al [105] explored, and the cold forward extrusion process, which Nurul et al [23] investigated. Figure 17 represent the typical extrusion experimental set up for both method approach.…”

Section: Methods Approach and Analysismentioning

confidence: 99%

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Tribological in Metal Forming Process and the Use of Bio Lubricant as Metal Forming Lubricant: A Review

Y.,

S.,

A. H.

2023

Jurnal Teknologi

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Due to its low scrap, high production rates, and higher yield strength of cold-formed products following forming operation, cold metal forming methods stand out as the most beneficial method of metal forming. The use of metal forming process is one of the major aspects in manufacturing process and the utilised of lubricant is extremely vital. When referring to lubricants, the term "bio-lubricant" refers to a stock that is both renewable and biodegradable. Fats and oils, which are derived from fatty acids, may be reacted with alcohols to create esters. It is crucial for the economy, people, and the environment that lubricants be developed and used efficiently. For this article, we scoured the literature and analyzed the most up-to-date research on the topic of metal forming process improvement and the use of vegetable oil as a metal forming lubricant. This research intends as a case study and demonstrating the tribological analysis in metal forming process and the potential of using bio lubricant in the metal forming. Future manufacture of new oil blends from new and conventional oil sources will be offered to the market for a variety of economic and health concerns.

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Section: Methods Approach and Analysismentioning

confidence: 99%

Section: Methods Approach and Analysismentioning

confidence: 99%

Tribological in Metal Forming Process and the Use of Bio Lubricant as Metal Forming Lubricant: A Review

Y.,

S.,

A. H.

2023

Jurnal Teknologi

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“…In another form of extrusion known as double cup extrusion, the billet is squeezed into the desired shape between the two punches [5]. The movable upper punch is pushed towards the fixed lower punch, and the pressure is applied to the billet, resulting in the free flow of the material around the two punches [5,6]. A double cup extrusion model is shown in Figure 1.…”

Section: Extrusion Toolmentioning

confidence: 99%

Reinforcement of Tooling Using Residual Stresses Generated by Cladding by Arc Welding

Israr

Buhl

Härtel

et al. 2022

Metals

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Cladding is typically used to protect components from wear and corrosion while also improving the aesthetic value and reliability of the substrate. The cladding process induces significant residual stresses due to the temperature difference between the substrate and the clad layer. However, these residual stresses could be effectively utilized by modifying processes and geometrical parameters. This paper introduces a novel methodology for using the weld-cladding process as a cost-effective alternative to various existing reinforcement techniques. The numerical analyses are performed to maximize the reinforcement of a cylindrical tool. The investigation of how the weld cladding develops compressive stresses on the specimen in response to a change in the weld beads and the welding sequence is presented. For the benchmark shape, experimental verification of the numerical model is performed. The influence of the distance between the weld beads and the effect of the tool diameter is numerically investigated. Furthermore, the variation in compressive stresses due to temperature fluctuations during the extrusion process has been evaluated. The results showed that adequate compressive stresses are generated on the welded parts through the cladding process after cooling. More compressive stresses are induced in the tool as the cross-section of the weld bead is increased. Furthermore, keeping a gap between the adjacent beads improves tool reinforcement. Hence, the targeted reinforcement of the substrate can be achieved by optimizing the welding sequence and process parameters.

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“…ey also used roll-gap sensors to measure contact pressure with very short computation times and investigated the effect of parameters on the contact pressure. Lee et al [12] examined the influence of geometrical parameters on the surface stress in the double cup extrusion process. Walbran et al [13] developed a generic liquid composite moulding simulation to predict clamping force and stress distributions acting on moulds.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Contact Responses of the Roller Cavity Surfaces in the Compressor Blade Rolling Process

Jin

Wang

Jiang

2020

Advances in Materials Science and Engineering

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The investigation of the contact responses is the key for evaluating the local wear of dies in the plastic forming process. This paper investigated the contact load distributions and evolutions of the roller cavities in the compressor blade rolling process by the FEM. It was the first study to quantify the distributions and evolutions of the contact responses for rolling irregular components. The results indicated that the maximum contact pressure is generally present at the center of the contact interfaces, and the magnitudes of contact pressure decreased with evolution of the blade rolling process. The rolling contact interfaces can be divided into the backward slip zone, the stick zone, and the forward slip zone based on the shear stress distributions. The stick zone was a narrow belt which separated the forward and the backward slip zone, and the shear stress in the stick zone was nearly zero. The shear stress magnitudes in the forward slip zone were smaller than those in the backward slip zone, and the directions of shear stress in forward and backward slip zones were adverse. The magnitudes of shear stress over the forward and backward slip zones decreased with evolution of the blade rolling process. The distributions of local sliding were in a V-shape, the local sliding in the stick zone was nearly zero, and the bigger sliding in backward and forward slip zones was present at the boundaries of rolling entrance and exit sections. The local sliding velocity magnitudes in the backward slip zones were always bigger than those in the forward slip zones, and the magnitudes of local sliding at the rolling entrance sections were bigger than those at the rolling exit sections. In general, the local sliding velocity magnitudes increased firstly and decreased sharply at 2T/3. The current paper develops the distributions and evolutions of contact responses in the blade rolling process. The contact responses can be used for studying the wear of roller cavities to avoid the accuracy inconsistency of the shaped blade.

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Surface stresses and flow modes on contact surface in a combined double cup extrusion process

Cited by 11 publications

References 12 publications

Tribological in Metal Forming Process and the Use of Bio Lubricant as Metal Forming Lubricant: A Review

Tribological in Metal Forming Process and the Use of Bio Lubricant as Metal Forming Lubricant: A Review

Reinforcement of Tooling Using Residual Stresses Generated by Cladding by Arc Welding

Investigating the Contact Responses of the Roller Cavity Surfaces in the Compressor Blade Rolling Process

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