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Tubemaking
ArticleName Wear features of working tools during piercing of high-temperature alloys
ArticleAuthor A. S. Aleshchenko, Yu. V. Gamin, B. Kh. Chan, V. Yu. Tsyutsyura
ArticleAuthorData

National University of Science and Technology (Moscow, Russia):

A. S. Aleshchenko, Cand. Eng., Associate Prof., Head of the Chair “Metal Forming”, e-mail: judger85@mail.ru
Yu. V. Gamin, Cand. Eng., Senior Lecturer, e-mail: gamin910@gmail.com
B. Kh. Chan, Post-graduate, e-mail: tbh510@gmail.com
V. Yu. Tsyutsyura, Post-graduate, e-mail: tsyutsyura.vladimir@gmail.com

Abstract

At present great attention is payed to tool wear resistance of screw rolling mills during tube production of high-alloys, high-temperature alloys and corrosion resistance alloys. The above said steel grades have high strength features and high adhesion to process tools. Wear resistance of working tools (mainly the mandrels for screw piercing rolling mill and working rollers) is widely reviewed in scientific articles. However working tool wear resistance at piercing of high-temperature alloy billets and the quality of the obtained shells are not completely studied. The both constantly attract attention of the investigators. The aim of the work is the description of the wear process of mandrels and working rollers of screw piercing rolling mill “MISIS-130D” at piercing of high-temperature alloy billets. At the first part of the article the linear dependence between the volume of wear part and material resistance of the mandrel to the number of pierced billets is determined. Alloy steel Cr18Co60W14Ni11 was used for the mandrels. As for the billets, they were made of alloy steel CrNi45Al, which gives possibility to predict the tool operation life. But at piercing of high-temperature alloys it is necessary to reduce adherence of the metal on the surface of the working tool. Two main factors which caused poor quality of the shells during the experiments were defined. They are loosing of the original mandrel shape and adherence of piercing material on the cone operation surface. At the second part of the article comparative analysis of data concerning the wear of working rollers made of steel grade 45 at “MISIS-130D” screw piercing rolling mill is given. The data were obtained as a result of computer simulation of piercing process using DEFORM-3D program and after experimental rolling. Using Archard’s model allowed to get data reflecting wear volume along the barrel length of the roller. The main area of roller wear is the inlet cone. And max value of wear depth of the operation surface can be found till minimal distance between the rollers during the rolling pass. Material resistance of working rollers was determined after rolling of about 150 tons of high-temperature alloy billets.

keywords Tool wear, piercing mandrel, working rollers, high-temperature alloy, material resistance, piercing, screw-rolling mill, wear process simulation
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