Introduction:

Our company has been committed to the research of upgrading and upgrading of drum gear coupling products for a long time, to strengthen the improvement of the comprehensive quality of employees and product quality excellence, so that our drum gear coupling has been praised by customers at home and abroad!

Various factors of drum gear coupling:

Drum gear coupling is composed of the same number of teeth inside ring and flange half coupling with outer teeth and other parts. Drum gear coupling allows large angular displacement (relative to straight gear coupling) to increase tooth contact conditions, improve the ability to transfer torque and extend service life. And the drum gear coupling in the case of different user conditions, the choice of materials are different, such as: 45# steel, 40CR,42CRMO, etc., bearing conditions and service life of various couplings determine the choice of coupling materials, and the selection of the same material, processing can be divided into casting and forging processing methods, here we mainly introduce the difference between casting and forging, for the majority of users to choose attention: The mechanical property of cast steel is higher than cast iron, but its casting property is worse than cast iron. Because the melting point of cast steel is high, the liquid steel is easy to oxidation, the liquidity of molten steel is poor, and the shrinkage is large. The shrinkage rate of the body is 10 ~ 14%, and the linear shrinkage is 1.8 ~ 2.5%. In order to prevent defects such as insufficient pouring, cold isolation, shrinkage cavity and porosity, crack and sand, etc., more complex technological measures than cast iron are adopted.

1. Due to the poor fluidity of liquid steel, in order to prevent cold insulation and insufficient pouring of cast steel, the wall thickness of cast steel can not be less than 8mm; The structure of pouring system should be simple, and the section size is larger than that of cast iron. Use dry casting or hot casting; Appropriately increase the pouring temperature, generally 1520° ~ 1600 ° C, because the pouring temperature is high, the superheat of molten steel is large, the liquid time is long, the liquidity can be obtained. But too high pouring temperature will cause coarse grain, hot crack, porosity and sand and other defects. Therefore, generally small, thin wall and complex shape castings, the pouring temperature is about the melting point temperature of steel +150℃; The pouring temperature of large and thick wall castings is about 100℃ higher than its melting point. 2. Due to the shrinkage of cast steel, cast iron is greatly overcast. In order to prevent shrinkage and porosity defects in castings, riser, cold iron and subsidy are mostly adopted in the casting process to achieve sequential solidification.

In addition, in order to prevent shrinkage holes, porosity, porosity and cracks in steel castings, the wall thickness should be uniform, the sharp Angle and right Angle structure should be avoided, the sawdust should be added to the mold sand, the coke should be added to the core, and the hollow core and oil sand core should be used to make the sand or core yield and permeability.

To sum up:

Forging is a common forming method in machine manufacturing. The mechanical properties of the forgings are generally better than those of the castings of the same material. The important parts of high load and severe working conditions in machinery, in addition to the simple shape of the available rolled plate, profile or welding parts, more forgings are used.

Through the above knowledge, we can understand the difference between cast steel and forged steel. When customizing drum gear coupling, please explain the material you want for the coupling. To sum up, the important coupling should choose the forged material of the coupling, and the general or large selection of casting material of the coupling, and the casting coupling should be strictly required that the coupling manufacturer should do the coupling without porosity, sand hole and so on defects, drum gear coupling can meet its due use requirements!