Dimensional accuracy of tubes in cold pilgering

Abe, Hikaru; Iwamoto, Takeaki; Yamamoto, Yoshiaki; Nishida, Satoru; Komatsu, Ryosuke

doi:10.1016/j.jmatprotec.2016.01.001

Cited by 28 publications

(9 citation statements)

References 5 publications

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“…Generally, the homogenization of SPPs can be conducted by repeating the deformation and annealing of Zr alloys during fabrication. In industry, commercial Zr alloy fuel claddings are manufactured by several cycles of deformation (hot extrusion or cold pilgering) and heat treatment after β-quenching [21]. In order to give a comparative study of the manufacturing methods, many researchers [22][23][24][25] used hot rolling and cold rolling instead of hot extrusion and cold pilgering to fabricate Zr alloy sheets with the same thickness for fuel claddings in the laboratory condition.…”

Section: Introductionmentioning

confidence: 99%

Homogenization and Growth Behavior of Second-Phase Particles in a Deformed Zr–Sn–Nb–Fe–Cu–Si–O Alloy

Chen

Sang

Zhang

et al. 2018

Metals

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Homogeneous distribution of fine second-phase particles (SPPs) fabricated by cycles of deformation and annealing in zirconium alloys is a critical consideration for the corrosion resistance of fuel claddings. Different deformation degrees of zirconium alloys would result in distinctive microstructures, leading to a distinct growth of SPPs during subsequent annealing. Unfortunately, the homogenization and growth behavior of SPPs in deformed zirconium alloys have not been well studied. In this work, a β-quenched Zr–Sn–Nb–Fe–Cu–Si–O alloy was rolled and annealed at 580 °C or 680 °C. The morphologies, distributions, and sizes of SPPs resulting from the different processing procedures were investigated. A linear distribution of SPPs is found in the β-quenched sample. Afterward, SPPs grow and are randomly distributed during heat treatment as the deformation degree or annealing time (or temperature) increases. The homogenization and growth of SPPs are attributed to the Ostwald ripening mechanism that is governed by lattice diffusion and short-circuit diffusion. The sample with a higher deformation degree is speculated to have a larger number of defects that provide more shortcuts for the mass transfer of SPPs, thereby facilitating a homogeneous distribution of fine SPPs during annealing.

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Section: Introductionmentioning

confidence: 99%

Homogenization and Growth Behavior of Second-Phase Particles in a Deformed Zr–Sn–Nb–Fe–Cu–Si–O Alloy

Chen

Sang

Zhang

et al. 2018

Metals

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“…Typically, around 100 of these steps are necessary to produce the final product [22]. It should be noted that a larger reduction in cross section is possible using cold pilgering compared to cold drawing [23]. The main parameters affecting the deformation are the die rolling rate, the movement of pipe after each step and the geometry of the tools.…”

Section: Cold Pilgeringmentioning

confidence: 99%

Manufacturing technologies and joining methods of metallic thin-walled pipes for use in high pressure cooling systems

McNair

Shokrani

Carnevale

et al. 2021

Int J Adv Manuf Technol

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Small diameter thin-walled pipes, typically with a diameter less than 20 mm and a ratio of outer diameter to wall thickness is 20 or above, have increasingly become a key value adding factor for a number of industries including medical applications, electronics and chemical industries. In high-energy physics experiments, thin-walled pipes are needed in tracking detector cooling systems where the mass of all components needs to be minimised for physics measurement reasons. The pipework must reliably withstand the cooling fluid operation pressures (of up to 100 bar), but must also be able to be reliably and easily joined within the cooling system. Suitable standard and/or commercial solutions combining the needed low mass and reliable high-pressure operation are poorly available. The following review of literature compares the various techniques that exist for the manufacture and joining of thin-walled pipes, both well-established techniques and novel methods which have potential to increase the use of thin-walled pipes within industrial cooling systems. Gaps in knowledge have been identified, along with further research directions. Operational challenges and key considerations which have to be identified when designing a system which uses thin-walled pipes are also discussed.

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“…Currently, small-diameter thick-walled tubes (outer diameter/wall thickness ≥ 3) for hydraulic machinery with inner surface roughness Sa ≤ 0.4 µm are mainly prepared by deep-hole drilling and multiple honing passes, which have the disadvantages of low efficiency and large resource consumption. Pilger cold rolling has been widely used in the preparation of high-precision thin-walled seamless tubes due to its high efficiency, low consumption, high dimensional accuracy, and good surface quality of the rolled seamless tubes [7][8][9]. If Pilger methods are used to prepare small-caliber thick-walled tubes, they can replace multiple honing and improve efficiency.…”

Section: Introductionmentioning

confidence: 99%

Inner Surface Morphology and Roughness Evolution of Pilgering Thick-Walled Tubes

Li,

Jin,

Wang

et al. 2023

Materials

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A hot-working die steel thick-walled tube Pilger rolling test was carried out using an LG40 Pilger mill, and the morphology and roughness evolution of the inner surface were examined using a white-light interferometer. The experimental results showed that micro-wrinkles formed on the basis of the original inner surface morphology, the altitude difference (Sz) between the peaks and valleys of the inner surface profile increased from 3.18 to 3.686 μm, and Sa increased from 0.722 to 0.892 μm in the diameter reduction zone. As the tube continued to feed into the wall thickness reduction zone, the micro-wrinkles gradually flattened, Sz and Sa were decreased to 1.625 and 0.174 respectively, and Sa maintained a slight fluctuation of 0.174~0.2 μm in the final sizing zone. From the diameters of the roller groove and taper of the mandrel, the three-dimensional strain of the tube in the wall thickness reduction zone was calculated, and the strain state of the tube in the complete deformation zone could be analyzed by finite element simulations. We found that in the diameter reduction zone, the inner surface was not supported by the mandrel and was free, while micro-wrinkles formed under circumferential compressive strain. In the wall thickness reduction zone, the deformation of the inner surface was controlled by the mandrel, and the micro-wrinkles were gradually flattened by radial compressive strain. The ratio of radial to circumferential strain was the key to flattening the micro-wrinkles, and when the ratio increased, the inner surface roughness (Sa) was reduced to 0.174 μm. In the sizing zone, the radial and circumferential strains were small, and the inner surface roughness showed no obvious fluctuation.

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Dimensional accuracy of tubes in cold pilgering

Cited by 28 publications

References 5 publications

Homogenization and Growth Behavior of Second-Phase Particles in a Deformed Zr–Sn–Nb–Fe–Cu–Si–O Alloy

Homogenization and Growth Behavior of Second-Phase Particles in a Deformed Zr–Sn–Nb–Fe–Cu–Si–O Alloy

Manufacturing technologies and joining methods of metallic thin-walled pipes for use in high pressure cooling systems

Inner Surface Morphology and Roughness Evolution of Pilgering Thick-Walled Tubes

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