Effects of cold-rolling operation parameters on the surface quality of stainless steel and titanium strips with oil pits

Jeng, Yeau-Ren; Aoh, Jong-Ning; Lee, Jian-Ting; Liu, Lee-Cheng; Tsai, Ping-Chi; Huang, Po-Whei

doi:10.1007/s00170-023-11685-7

Cited by 4 publications

(1 citation statement)

References 27 publications

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“…The adsorption capacity of oxygen atoms is higher in the region of high strain than in the region of low strain. The subinterfacial layer structure of the E-H-emulsion-lubricated rolled parts has a higher strain intensity distribution (Figure a), which results in a thicker oxide layer (Figure d). , …”

Section: Resultsmentioning

confidence: 99%

Microstructural Evolution of Emulsion-Lubricated Cold-Rolled Steel Interface

Wang,

Wan,

et al. 2024

ACS Appl. Eng. Mater.

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The complex interaction between emulsion lubrication, heavy-load rolling, interfacial friction, and interfacial microstructural evolution is an urgent scientific problem that needs to be explored for emulsion-lubricated rolling. In this study, the evolution of the surface and interface microstructures of AISI-1045 steel subjected to two types of emulsion lubrication rolling is investigated. The influence of the differences between the properties of the emulsions (wettability, homogeneity, and tribological properties) on the surface and interface of the rolled material is analyzed. The results show that the differences between the emulsion properties produce different rolling forces and surface qualities. The rolling force and surface roughness of E-H (Emulsion H) having poor emulsion properties increase by 9.3% and 83.3%, respectively, compared with those of E-L (Emulsion L) having superior properties. The excessive rolling force exerted when applying E-H-emulsion-lubricated rolling results in a gradient distribution structure of the material surface: a layer of fine grains, layer of finely deformed grains, and layer of large grains with a small amount of deformation. Many defects (stacking dislocations, dislocation unit structures, and twinning boundaries) are distributed in the fine-grained and finely deformed-grain layers. The dense distribution of dislocations in the crystals leads to further rotation of the texture toward the Brass{011}⟨211⟩ and S3{123}⟨634⟩ texture components. Consequently, the variability in the emulsion properties significantly affects the surface and interfacial structural composition of the rolled material. Thus, material properties are affected. This study provides methods for optimizing the cold-rolling lubrication process.

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Section: Resultsmentioning

confidence: 99%

Microstructural Evolution of Emulsion-Lubricated Cold-Rolled Steel Interface

Wang,

Wan,

et al. 2024

ACS Appl. Eng. Mater.

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Numerical and experimental analysis of edge wave defect control during TA2 circular tube cold roll forming

Yue,

Zhang,

Xiao

et al. 2024

Engineering Reports

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The increasing application of TA2 titanium profiles in marine and petrochemical industries has spurred in a growing demand for diverse forms, including U‐shaped, rectangular, and tubular thin‐walled profiles. Traditional methods like mechanical subtractive processing and extrusion, despite their prevalence, suffer from high production costs and low efficiency. As a metal sheet forming technology, roll forming stands out for its efficiency, accuracy, and capability of producing complex shapes continuously. Nevertheless, the application of cold rolling to TA2 profiles is challenging primarily due to its low elastic modulus and high yield strength. In view of this, this study employed finite element simulation to analyze the stress and strain distribution during the TA2 roll forming process, aiming to have a better understanding of edge wave defect formation mechanism. Orthogonal experiments were performed to assess the influence of frame spacing, forming speed, roll gap, and downhill amount, on edge wave defects. The findings revealed a predominant influence of the downhill amount. Maintaining the downhill volume at 0.6 times the tube diameter kept the longitudinal strain below 0.9%, effectively mitigating edge wave defects. Implementation of these optimized parameters in an actual TA2 roll forming process confirmed the reliability of the simulations. This study establishes a solid foundation for advancing the TA2 tube cold roll forming process, enhancing the production efficiency of titanium profiles, and shedding some light on current energy conservation and emission reduction.

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Analysis and Prospects of Lubrication and Friction Characteristics in Cold Strip Rolling: A Review

Jin,

Li,

Gao

et al. 2024

steel research int.

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Lubrication and friction are the core processes in cold strip rolling, which are the key links to realizing the stable production of high‐quality strips, reflecting country advanced level in rolling technology. This review investigates the crucial properties of lubrication and friction in cold strip rolling by analyzing the mechanism, characterization methods, and influencing factors. The lubricant forms an oil film on the surface of rolls and strips based on the lubrication dynamics and tribology theory, changing the asperity contact state in the loaded roll gap, leading to changes in friction characteristics. Oil film thickness and coefficient of friction (COF) are crucial parameters for characterizing and judging the characteristics of lubrication and friction, theoretical calculations have become the core analytical method, and the study of the measurement method is still a great challenge. Parameters like rolling speed and oil viscosity affect the lubricant distribution and asperity contact in the loaded roll gap, changing the lubrication and friction state. The influence of parameters is strongly linked to the experimental or rolling environment. Prospective research trends on lubrication and friction in cold strip rolling are presented based on the status of research on lubrication and friction characterization.

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Effects of cold-rolling operation parameters on the surface quality of stainless steel and titanium strips with oil pits

Cited by 4 publications

References 27 publications

Microstructural Evolution of Emulsion-Lubricated Cold-Rolled Steel Interface

Microstructural Evolution of Emulsion-Lubricated Cold-Rolled Steel Interface

Numerical and experimental analysis of edge wave defect control during TA2 circular tube cold roll forming

Analysis and Prospects of Lubrication and Friction Characteristics in Cold Strip Rolling: A Review

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