Temperature Effect on Plane Bending for angles, channels and strips made of Aluminum, Copper, or Iron

نوع: Type: thesis

مقطع: Segment: masters

عنوان: Title: Temperature Effect on Plane Bending for angles, channels and strips made of Aluminum, Copper, or Iron

ارائه دهنده: Provider: Vahid Malekzadeh

اساتید راهنما: Supervisors: Dr. GHolamhosein Majzoobi

اساتید مشاور: Advisory Professors:

اساتید ممتحن یا داور: Examining professors or referees: Dr.Amirhosein Mahmoodi – Dr.Hashem Mazaeri

زمان و تاریخ ارائه: Time and date of presentation: July 18, 2020

مکان ارائه: Place of presentation:

چکیده: Abstract: Bending is one of the most important methods of forming metals. One type of bending is in-plane bending, which is used to bend some profiles such as belts, corners and studs. In industry, this operation is often done by heating the part, which is costly and time consuming. In-plane bending method is a much more accurate and cost-effective method than other bending methods that can be used to bend the mentioned profiles with good flexibility. One of the distinguishing features of this method compared to other methods is its controllability and prevention of warping and spring return of the profile. The design of the in-plane bending machine is such that the profile is driven by a feeder roller between the two parts of the mandrel and the anvil, and there between these two parts it is continuously pressed and due to the wedge shape of the mandrel, the profile It gradually bends. It is noteworthy that there is a furnace in between, which if necessary, the piece is first heated and then pressed. It is worth mentioning that the effect of heat on the bending of profiles by in-plane method is investigated for the first time in this dissertation. In this research, a plate bending device with the ability to control the temperature, frequency and interference of the mandrel inside the part has been used. The mandrel has an angle of 2 degrees and is made of steel. The tested materials are made of iron and aluminum with the shapes of belts, corners and studs, which are tested at three different temperatures according to their recrystallization temperature and three different frequencies. Also, to verify and save time and money, the in-bending process is modeled by LS-Dyna software. Fortunately, an acceptable agreement has been found between the experimental and numerical results. The Johnson-Cook material model was used to model the experiments and its constants were extracted from the tensile test as well as the use of related articles. Key Words: Intra-plane bending, recrystallization temperature, modeling, Johnson Cook material model

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