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What are the defects of open die forgings parts during heating

Edit: Jingjiang Jinlun Machine Manufacturing Co.,Ltd    Date: Jul 21, 2017

What are the defects of Open Die Forgings parts during heating

1. Overheat and overheat: the temperature in which the overheat refers to the temperature in which the steel is overstepped in the heat, and the grain size is large. Heat treatment, brittle and mechanical properties are reduced, but can be removed by Open Die Forgings or annealing. Overheat is caused by too long heating and too high temperature to cause the metal to appear oxides or some of the melting phenomena. A burnt out cannot be made up.

Decarburization: decarburization refers to the phenomenon that the carbon in the steel surface is all or some burned. Decarburization makes the surface appear soft, reducing surface hardness, wear resistance and fatigue strength.

3. Beryllium oxide: beryllium oxide not only loses many steel, but also reduces the surface quality and the life of Open Die Forgings die. If it is pressed into the metal, it will be scrapped.

4. Stress: due to the difference of heat and heat inside and outside of the metal, the swelling is not uniform, and the internal stress of the attack is called thermal stress. Heating causes the change of the metallographic structure and also stresses the stress. This will cause the workpiece to crack in the heat, causing the car to be cracked and scrapped after processing.

5. Fracture of transverse section: this defect damages the chemical composition and homogeneity of the steel, Open Die Forgings which reduces the hardness and deterioration of mechanical properties. If the temperature of annealing is too high to form the graphite section, it will not be easy to cut and to heat and deform when quenching. However, if the annealing is not hot or the temperature is low, then the pearlite can not complete the globalization, and also is not conducive to the cutting and subsequent heat treatment.

6. Hard and brittle network carbide: it weakens the bonding force between the crystal materials, making the mechanical property significantly worse, especially the impact resistance, but can be improved or eliminated by positive fire. If a banded carbide, can make the hard degree after quenching and tempering and organization, and a brief deformation, which is along the direction of machining deformation of pearlite and ferrite appears banded structure of a defect. Together, it also reduces the plastic and patience of the steel, which makes the machining scale unstable and the cutter is sensitive to wear

Open Die Forgings are widely used in life, also has been widely welcome in the market, the temperature is an Open Die Forgings need all not cognitive, under the open die Open Die Forgings factory will give you a brief introduction to open die Open Die Forgings temperature and of the good qualities of you need.

Open Die Forgings is used in manufacturing machinery parts in production, and the important way of workpiece is also one of the method of using pressure on metal processing, in this process, we used the pressure change the shape of a metal blank, enable it to have the shape of the corresponding requirements or verify the compression force. In the process of Open Die Forgings, the casting will have fine granular structure, which will improve the physical properties of the metal. The design of the correct and fine Open Die Forgings parts can cause the particles to flow in the direction of the main pressure when used.

There are many kinds of classification according to the Open Die Forgings parts, which can be divided into hot Open Die Forgings, hot Open Die Forgings and cold Open Die Forgings according to the temperature of Open Die Forgings parts. Open Die Forgings temperature at a specific temperature above the recrystallization temperature of 30% for hot Open Die Forgings, namely when the Open Die Forgings temperature at a certain temperature the recrystallization temperature of 30% only is the warm Open Die Forgings, the corresponding Open Die Forgings temperature in the recrystallization temperature of less than 30% for cold Open Die Forgings. The process of Open Die Forgings flange Open Die Forgings process changes the metal organization and improves the mechanical properties of the workpiece. Therefore, this manufacturing method can be used to produce parts that bear a large load in the manufacturing process.

For many metal parts, generally speaking, there are casting and Open Die Forgings in two ways, casting is suitable for those accessories for precision and quality requirements is not high, but the Open Die Forgings is different, the open die Open Die Forgings a more excellent than casting, because the casting does not change the original organizational structure and mechanical properties of the metal, the fibrous structure to increase the strength and toughness of the metal, is very suitable for those who are easy to wear and tear parts, at the same time Open Die Forgings is more advantageous to plastic operations such as welding deformation, and after these steps, its performance will not change a lot. So it is widely used in modern industry.

Jingjiang Jinlun Machine Manufacturing Co.,Ltd