Explorative study of rotary tube piercing process for producing titanium alloy thick-walled tubes with bi-modal microstructure

Zhang, Zhe; Liu, Dong; Yu, Yanlong; Zheng, Yusheng; Pang, Yongqiang; Wang, Jianguo; Wang, Haiping

doi:10.1016/j.acme.2018.05.005

Cited by 22 publications

(10 citation statements)

References 23 publications

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“…Для получения труб из черных и цветных металлов в промышленности применяются различные сочетания оборудования в зависимости от требуемой производительности, размерного сортамента и других факторов [13][14][15]. Толстостенные трубы с отношением наружного диаметра к толщине стенки D/S < 6 чаще всего изготавливают способами винтовой прошивки с последующей раскаткой или калибровкой-редуцированием в трехвалковом стане винтовой прокатки [16][17][18].…”

Section: обработка металлов давлениемunclassified

Obtaining hollow semi-finished products from copper alloys for electrical applications by screw rolling method

Gamin

Романцев

Pashkov

et al. 2020

Izv.VUZ. Tsvet. Met.

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The article proposes a process for obtaining semi-finished products in the form of pipes made of copper alloys for electrical applications using the screw rolling method. The paper presents the results of experimental piercing and rolling of pipe samples made of Cu–0.75Cr copper alloy billets with a diameter of 45 mm. The 43.5×10.0 mm samples obtained after piercing using a two-roll screw rolling mill had exact geometrical dimensions: outer diameter deviation at the front end was up to 1 %, at the back end – up to 2.4 %; relative variation in wall thickness at the front end was 0.3÷0.5 %, at the rear end – 0.5÷1.0 %. Then pierced pipe samples were rolled using a three-roll radial-shear rolling (RSR) mini mill with a different total degree of reduction – samples were obtained with an outer diameter of 30, 25 and 18 mm. The reduction process was analyzed from the point of view of internal hole stability and deformation. In case of 30 % relative reduction of the outer diameter, rolling without a mandrel is accompanied by wall thickening. In this case, inner diameter deviations are within acceptable limits. The experiments on obtaining samples from the Cu–0.75Cr alloy by screw piercing and reduction in the RSR mill show that this scheme can be implemented in principle in industry. At the same time it is necessary to define more exactly deformation parameters (degree of deformation, choice of reduction scheme) to obtain a quality product. Various options for heat treatment (HT) of the obtained pipe samples and the effect of the HT method on electrical conductivity and hardness are considered. Samples after piercing had a conductivity of 59.3 % IACS. The maximum electrical conductivity of 76.7 % IACS was obtained on samples after quenching from a temperature of 1020 °C and aging at 450 °C for 3 h. The results of the work show the fundamental possibility of obtaining semi-finished products from copper alloys for electrical purposes using the screw rolling method.

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Section: обработка металлов давлениемunclassified

Obtaining hollow semi-finished products from copper alloys for electrical applications by screw rolling method

Gamin

Романцев

Pashkov

et al. 2020

Izv.VUZ. Tsvet. Met.

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“…Regarding the review of two-high screw rolling research publications, it is worth noting articles connected with hollow shell microstructure formation under different deformation regimes [ 20 , 21 , 22 , 23 , 24 ]. Publications [ 25 , 26 ] are about the influence of the shape and dimensions of the plug on the accuracy of the hollow shell dimensions.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Hardness of Hollow Tube Shells at Piercing in Two-High Screw Rolling Mill with Different Plugs

et al. 2022

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AA6060 ingots were pierced in a two-high screw rolling mill (MISIS-130D) with guiding shoes (Mannesmann mill type). Three different plugs, i.e., a conventional entire plug, a plug with a cavity, and a hollow plug, were used for piercing. We established that the grain size decreases after piercing, by order of magnitude, compared to the initial non-pierced annealed bill, with a grain size of 100–400 μm, and the hollow shell grains are elongated along the piercing direction. The produced hollow shells had 30% higher hardness than the initial billet. The highest hardness values were obtained after piercing the conventional entire plug. The most uniform hardness distribution through the hollow shell’s volume was obtained after piercing the hollow plug. The cross and longitudinal section hardness measurements demonstrate that the hardness decreases from the outer surface to the inner surface of the hollow shells.

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“…Zhang et al 18,19 claimed the RTP is feasible for titanium alloy tube with a bi-modal microstructure. Thus, the FE model was carried out via the cone type roll.…”

Section: Introductionmentioning

confidence: 99%

Study of the rollers geometry effects in rotary tube piercing and wear analyses of mandrel according to the finite element method

Darki

Raskatov

2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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The rotary tube piercing (RTP) is the first process of making the seamless tube after producing the desired alloy ingot. There are several approaches to manufacture a seamless tube, but one of the most common types is RTP. This approach covers a wide range of processes that are categorized according to the number and shape of the rollers. On the other hand, each of these types has designed guides in the output and input of the piercing process. In this paper, a new design of the input guide for four types of rollers have been examined and simulated. Thus, four specimens including Diescher and Conical rollers were considered, with the different number of rollers. Results including torque, total force, mandrel wear, temperature distribution, and strain were extracted using FEM simulation. In order to the validation of simulation, the total force and oscillations of applied force within the process have been compared with the experimental results. The results obtained through this simulation, are more in line with the empirical results obtained from previous research. As well as, the FEM simulation confirmed the performance accuracy of the output and input guides of the RTP process. On the other hand, the results indicate that the three-roller Diescher type with 17° feed angle, has the most suitable arrangement for production of seamless tube.

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Explorative study of rotary tube piercing process for producing titanium alloy thick-walled tubes with bi-modal microstructure

Cited by 22 publications

References 23 publications

Obtaining hollow semi-finished products from copper alloys for electrical applications by screw rolling method

Obtaining hollow semi-finished products from copper alloys for electrical applications by screw rolling method

Microstructure and Hardness of Hollow Tube Shells at Piercing in Two-High Screw Rolling Mill with Different Plugs

Study of the rollers geometry effects in rotary tube piercing and wear analyses of mandrel according to the finite element method

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