- Continuous rolling plant
- SACK-Reversing rolling mil
- Cold rolling mill
- The three-stand open three-high rolling mill
The heart of the rolling mill at the Institute of Metalforming is a multi-stand-by continuous rolling mill for the simulation of real hot-rolling processes for flat or long products in laboratory scale. Similar to the design of the SACK test mill, the project planning and realization of the continuous rolling mill was of great importance for a universal design and the possibility to realize a wide range of tasks. This allows the systems to be operated in both, wire and flat, configurations, and allows an industrial investigation of the rolling process with up to four (flat) or five (wire) individual masts.
As a result, the facility, modernized in 1980, is an integral part of the institute and an important foundation for modern, practical education and research at the Institute of Metalforming.
In the flat configuration, the continuous rolling mill consists of a duo reversing stand, which serves as a roughing stand and three successive housing scaffolds in a continuous configuration. In front of the reversing stand is an optional scouring scraper for removing the primary scaler and a driver for shooting the specimen into the reversing scaffold and the following housing scaffolding for the finishing rolling after the roughing.
The heating of the starting material can optionally be carried out inductively or in warming-up mode, optionally also in combination of inductive rapid heating and compensation time in the preheated oven. A further driver is connected to the last finishing stand, which transports the finished strip into the cooling section, in which the cooling can be carried out with fixed parameters. Finally, the finished strip can be driven into a regalo furnace, which can realize defined cooling curves in different temperature zones - to simulate a coil cooling for example.
The rotational speeds, rolling forces and moments of all scaffolds are recorded by data technology, and it is possible to measure and record the temperature at different points in the mill train via pyrometers. Accordingly, different hot-rolling processes can be followed using real hot-rolled strip lines, or new technology possibilities can be explored.
In the wire configuration, calibrated rolls are used in the duo roughing mill, which allow a reversible pre-rolling of the rolled material. The subsequent finishing step consists of four production booths in an H-V-H-V configuration, the scaffolding and the roller rings used correspond to the real systems in industrial finishing cylinders.
The heating can be carried out either inductively or in warming-up mode, alternatively also in combination of inductive rapid heating with subsequent compensation in the oven. In front of the reversing stand, there is an optional scouring scraper as well as a driver for feeding the pre-rolled material into the reversing stand and the subsequent finishing scaffolds for a continuous H-H-V-H-V sequence.
Following the finishing step, a cooling path is optionally followed for the defined cooling of the rolled material. The end of the rolling mill is formed by a winding arm for the finished wire. This can optionally operate with a stemming belt with optional active air cooling, a lead bath or a thermopod so that different cooling / patenting methods can be implemented. In the case of appropriately short finished wires, it is also possible to feed into the shelves for flat strips in order to simulate defined cooling / holding curves there.
The rotational speeds as well as rolling forces and moments of the roughing stand as well as of the finishing stagger can be recorded electronically, the temperature measurement at desired points along the rolling line is easily possible via pyrometers. In this plant configuration, the processes in real wire and bar steel lines can be simulated and new technologies new materials can be developed on a small scale.
With the appointment of Dr.-Ing. Otto Emicke as a professor at the Chair for Rolled Works and Transport at the Bergakademie in 1928, the history of the rolling mills at today's Institute for Metal Forming begins. The SACK reversing scaffold was already designed in the design phase as a pure test mill according to the plans of Prof. Emicke and officially put into operation in June 1930.
In revised and modernized form, the mill is still used today for extensive and demanding research in the field of rolling flat and long products at the Institute for Metal Forming. Advantageous for the implementation of many research projects, the anticipation of the original design has always been proven with a sliding roller stand which allows the use of different rollers with bale lengths of 500 to 800 mm as flat or caliber rollers.
In addition to the duo configuration, the large stand windows also enable the realization of four-quarter roller installations as well as a universal roller installation for the rolling of rail profiles. In addition, further devices can be installed before or after the framework, for example, test systems for descaling or cooling sections. For the evaluation of rolling tests, the framework is equipped with devices for measuring speed, rolling force and worm torque, as well as finish and finish rolling temperatures through pyrometers. Due to the extensive research activities in the field of lightweight magnesium, the scaffold was additionally equipped with a roller heating system, which allows preheating of the working rolls in duo installation up to 160 °C.
Even at the time of its construction, the Freiberger SACK test rolling mill differed greatly in its construction and design from many experimental and teaching mills of the time, and also over 85 years after the first construction site, with a great deal of far-sightedness by Prof. Emicke and the SACK machine factory the institute provides valuable and reliable research and student training services. For this reason, the Institute of Metalforming has also committed itself to preserve this rolling mill in its almost original conception as a unique tool in the technology and science history for subsequent.
The Institute for Metal Forming has a cold-rolling reversing stand, which can be operated in duo and for special thin dimensions or solid materials in the quarto installation, for investigations concerning the rolling of thin sheet and cold strip as well as for research into new technology concepts for cold-rolling.
The framework has two reels so that, in addition to sheets, tapes can also be reversibly rolled. The framework has force measuring sockets for measuring the rolling force and the possibility of recording the rolling speed and rolling speed.
For research and technology development in the field of long products, the Institute for Metal Forming has an open three-stand open three-high rolling mill with an extensive series of calibrations for rolling round bars and wires with different cross sections.
In addition to the production of materials for further tests, e.g. the wire or rod line, The three-stand open three-high rolling mill is often used for research in the field of non-ferrous metals and special materials. The three-stand open three-high rolling mill has a torque measurement on the drive spindles, force measuring doses for the rolling force measurement on all three scaffolds to measure the process-important data sets. For the temperature measurement the connection possibility of several pyrometers at different measuring points is given