Investigation of ultrasonic vibration effects on the microstructure and hardness of aluminum alloy 2024 tube spinning parts

Rasooli, Mohammadali; Moshref-Javadi, Mehrshad; Taherizadeh, Aboozar

doi:10.1007/s00170-014-6500-5

Cited by 21 publications

(3 citation statements)

References 17 publications

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“…In general, the hardness affected by flow forming is reduced from the outer surface toward the inner layers [27,28]. It should be noted that the gas cylinder after cold flow forming was heat treated.…”

Section: Discussionmentioning

confidence: 99%

Microstructure and Mechanical Properties of 34CrMo4 Steel for Gas Cylinders Formed by Hot Drawing and Flow Forming

Fang

et al. 2019

Materials

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An integral manufacturing process with hot drawing and cold flow forming was proposed for large-diameter seamless steel gas cylinders. The main purpose of this study was to find out the effects of the manufacturing process on the microstructure and mechanical properties of gas cylinders made of 34CrMo4 steel. Two preformed cylinders were produced by hot drawing. One cylinder was then further manufactured by cold flow forming. The experiments were carried out using three types of material sample, namely, base material (BM), hot drawing cylinder (HD), and cold flow-formed cylinder (CF). Tensile and impact tests were performed to examine the mechanical properties of the cylinders in longitudinal and transverse directions. Microstructure evolution was analyzed by scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD) to reveal the relation between the mechanical properties and the microstructure of the material. It is found that the mechanical properties of the 34CrMo4 steel gas cylinders were significantly improved after hot drawing and flow forming plus a designed heat treatment, compared with the base material. The observations of microstructure features such as grain size, subgrain boundaries, and residual strain support the increase in mechanical properties due to the proposed manufacturing process.

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Section: Discussionmentioning

confidence: 99%

Microstructure and Mechanical Properties of 34CrMo4 Steel for Gas Cylinders Formed by Hot Drawing and Flow Forming

Fang

et al. 2019

Materials

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“…Rasoli et al designed and manufactured a robust experimental tube spinning system, in which the preform and mandrel can be excited by ultrasonic vibrations. Tube spinning experiments under ultrasonic vibrations were carried out on annealed AA-6061 preforms [10]. Ma et al investigated power spinning processes of conical parts with transverse inner rib under different processing parameters [11].…”

Section: Introductionmentioning

confidence: 99%

A sheet blank rotary forging process for disk-like parts with thickened rims

Jin

Wang

2016

J Mech Sci Technol

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Disk-like parts with both thin web plates and thick rims are widely applied in automotive and aviation industries. These parts are usually made via welding and machining, which often lead to low material utilization, high energy consumption and low product performance. Therefore, a new sheet blank rotary forging process for thickening the rims of disc-like sheet blanks with uniform thicknesses was proposed in this paper. Based on FEA and experiments, both the effects of main defects and process parameters on forming were investigated. Besides, by considering the flow line distribution in formed parts, the material deformation feature in the forming process was analyzed. The results showed that the deformation process can be divided into four stages, and there are mainly four kinds of defects occurring during forming. Materials in the outer side of rim flows not only in the radial direction but also in the tangential direction.

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“…Rasoli et al [16,17] introduced ultrasonic vibration into the spinning process and installed the ultrasonic vibration system at the connection between the spinning mandrel and the spindle of the machine tool. The principle of this structure is that the ultrasonic horn fixed at the spindle drives the mandrel and the workpiece to generate circumferential high-frequency ultrasonic vibration, and the roller also feeds in the axial direction at the same time, which realize the spinning forming of the thin-walled cylindrical parts.…”

Section: Introductionmentioning

confidence: 99%

Effect of ultrasonic attenuation characteristics on forming accuracy of ribbed cylindrical parts in ultrasonic-assisted spinning process

Li,

Zhu,

Zhao

et al. 2023

Preprint

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Ultrasonic-assisted forming process is one of the important methods to improve the formability of materials because of its acoustic softening effect and antifriction effect. After the introduction of ultrasonic, the forming accuracy of the inner ribs is improved in the spinning process of ribbed cylindrical parts, but the effect law of ultrasonic energy on the forming of inner ribs have not been clarified in detail. In this paper, a modeling method of ultrasonic-assisted spinning was proposed, which was taken into account the attenuation characteristics of ultrasonic energy in solid media for the improvement of the simulation accuracy. The corresponding simulation model was established to explore the effect law of ultrasonic amplitude on the forming accuracy of inner ribs. The results showed that the forming height and surface morphology of longitudinal ribs can be improved effectively in the ultrasonic-assisted spinning process. With the increase of ultrasonic amplitude, the forming height of longitudinal rib gradually increased, but the increase degree gradually slowed down, and the surface morphology of the longitudinal ribs always present the geometric characteristics that the screw-in end is higher than the screw-out end. The reason is that the application of ultrasonic vibration promoted the radial and circumferential flow of the material, and improved the material filling ability into the rib groove. The combined effect of ultrasonic softening effect and anti-friction effect reduced the radial filling difference between the screw-in end and the screw-out end of the ribs. Ultrasound could enhance the material flow but did not significant change the forming distribution characteristics of the ribs, resulting in limited rib height and uneven surface morphology. Also, the energy field gradient design method along the sheet thickness was proposed to further improve the forming accuracy of the inner ribs.

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Investigation of ultrasonic vibration effects on the microstructure and hardness of aluminum alloy 2024 tube spinning parts

Cited by 21 publications

References 17 publications

Microstructure and Mechanical Properties of 34CrMo4 Steel for Gas Cylinders Formed by Hot Drawing and Flow Forming

Microstructure and Mechanical Properties of 34CrMo4 Steel for Gas Cylinders Formed by Hot Drawing and Flow Forming

A sheet blank rotary forging process for disk-like parts with thickened rims

Effect of ultrasonic attenuation characteristics on forming accuracy of ribbed cylindrical parts in ultrasonic-assisted spinning process

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