ABSTRACT OF THESIS

Theme: "Research of process of resiliently-plastic bend and straightening of continuously poured slabs on the stage of incomplete crystallization".

Scientific leader: Smirnov Eugen
Actuality. Subsequent development of process of the continuous pouring of steel is linked, above all things with the decision of the following questions: increase of sizes of transversal section of slyab, taking into account the necessity of production of pipes of large to the diameter from leaves breadthways to 4800mm; abbreviation of cycle of production; upgrading metal and his homogeneity of; reduction of wastes of metal.
The last years there is a tendency to the rise of requirements to quality of slyab which get on the machines of the continuous pouring of steel. Conducting of additional researches of the tense-deformed state of slyab during the process of bend and razgiba is a ponderable stake for the decision of this task.

Introductory part. The bend and razgib of slyab is produced on vertical(bend and razgib after completion of crystallization), radial and curvilinear MNLZ(bend and razgib at presence of liquid serdtsevini or razgib after complete crystallization).
Systems of razgiba of slyab are divided on:
- straightening in a few points;
- continuous straightening.
System of razgiba of slyaba of the Mannesmann firm in the Hukingene (Germany) town. Slyabi pass consistently three areas with the radiuses 6,6, 9,9 and 19,6m. Slyab has liquid serdtsevinu.
The straightening the systems Konkast (Switzerland) Firms are divided on the brands of poured staley out:
- steels, possessing high durability at the promoted temperature, which spill with relatively low speeds. Bars, in this case, can be straightened in the fully hardening state only;
- steels, having middle durability at the promoted temperature, which spill with high speeds and can be deformed at presence of liquid serdtsevini in the area of unbending of bar;
- steels, having low durability at the promoted temperature, which spill with high speeds. Bars, in this case, can be straightened at presence of liquid serdtsevini.
The systems of bend and razgiba classify on the type of mechanism of moving and clamp of rollers and quantity of rollers in one section.
The parameters of areas of bend and razgiba can be divided into energosilovie, geometrical and deformation.

Basic part. During conducting of experiment it is planned to carry out the physical design of process of bend and razgiba of slyab on "Azovstal". For the design the following parameters are chosen: the section of 220/1250mm poured out, diameters of supporting rollers of drives - 250 and 300 mm, and no the drive - 230 mm.
The chart of the laboratory setting is shown on a picture.

Setting provides possibility of the two-tier varying of diameter of drive roller and step of rollers.
As factors of the planned experiment are chosen: attitude of step of rollers toward the diameter of no the drive roller of lр/dн; attitude of thickness of standard toward the diameter of the drive roller H/dв; gradient of temperatures on the section of the standard dt°; relation of area of section which imitates a liquid phase, to the area of transversal section of the model AF= F0 /F.
By the result of treatment of the primary information got through the method of coordinate scales, are the degree of deformation by the dр change and index of the tense state of d/Т.

Picture - Photo of model
Complete list of sources
1. Єронько С.П., Биковських С.В. Фізичне моделювання процесів позапічної обробки та розливання сталі. - К.: Техніка, 1998.- 136с.
2. Бровман М.Я. Марченко И.К. Усовершенствование технологии и оборудования машин непрерывного литья заготовок, "Техніка", 1976, 165 стр.
3. Б.А.Кузьмин, Ю.Е.Абраменко. Технология материалов и конструкционные материалы: Учебник для машиностроительных техникумов - М.: Машиностроение, 1981. - 351 с.
4. Попандопуло И.К., Михневич Ю.Ф. Непрерывная разливка стали: Учебник для СПТУ. М.: Металлургия, 1990. 256с.
5. Докт. инж. Р. Томе, докг. В. Остхаймер, Г. Ней, Ф. Рюппель, компания Saarstahl AG; докт. А. Гиргензон, У. Плоциник, В. Шмитц, X. Гиркенс, М. Беккер. МЯГКОЕ ОБЖАТИЕ ЗАГОТОВОК НА МАШИНЕ НЕПРЕРЫВНОГО ЛИТЬЯ S0 КОМПАНИИ SAARSTAHL, AG. 6. Перевод № 4951. Непрерывное выпрямление. Модификации на МНЛЗ №1 в фирме "Соллак". Ж.П.Радо. 1985г.
7. Шевченко В.П. Непрерывная разливка стали: Уч.пособие - Донецк: ДПИ, 1985.-80с.
8. Ю.Н.Белобров, А.Н.Смирнов,А.Ю.Цупрун. Основные технологические решения по реконструкции слябовых МНЛЗ ОАО "МК "Азовсталь". "Металл и литьё Украины". 1,2006.
9. Л.С.Рудой, В.И.Баптизманский. Производительность машин непрерывного литья заготовок, "Техника", 1982, 152с.
10. А.Ю.Цупрун, А.Н.Смирнов, С.В.Гридин. Оптимизация параметров загиба и разгиба непрерывнолитой заготовки. "Сталь". №8. 2006г.
11. Howe A. Estimation of liqudus temperatures for steel // Iron making and steel making.- 1988.v.15.-№3.-P.134 - 142.
12. Грудев А.П.Теория прокатки. М.: Металлургия. - 1988. - с.240.
13. Янагимото Тацуми, Моритани Хироаки, Цутия Харуо. Применение пластилина для изучения процессов горячей прокатки стали. "Тэцу то хаганэ, Tetsu to hagane, J. Iron and Steel Inst. Jap.", 1977, 63, №4, S 208 (япон.)
14. Колмогоров В.Л. Напряжения. Деформации. Разрушение. -М.:Металлургия, 1970.-230с.

References on a theme

http://www.masters.donntu.ru/2005/fizmet/nikolnikova/library/1.htm - continuous pouring of steel on slub

http://www.039.help-rus-student.ru/text/063.htm - continuous pouring of steel

http://www.nppsm.ru/CastingSteel.php - history of development and modern state of the continuous pouring of steel

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