Based on the analysis of the fracture toughness and other relationships of skf bearing steels and the process of material crack development:
It is not difficult to see that in the case of high dn value and the existence of hoop stress, the classification and various components of the needle roller bearing, marking method, high-speed steel surface treatment and low carbon content of high-speed steel hardened surface depth SKF bearing changes are important significance.
To this end, SKF has developed a material surface treatment process that enhances surface hardness and compressive stress. The surface-treated material has the following characteristics: it has good fatigue crack resistance, and in the second stage, the crack has a low expansion rate, and the quenching is insufficient or the carbon content is low. The fracture toughness value of the core material caused by the SKF bearing Higher.
The surface treatment process developed by SKF includes:
(1) Locally heat-treated local high-speed steels that are insufficiently quenched by means of shock, electrical SKF bearing bundles, or induction hardening to obtain surface hardened layers. Automotive water pump bearings It should be pointed out here that insufficient quenching is to improve the fracture toughness of SKF bearings.
(2) A surface hardened layer is obtained by chemical heat treatment. This method involves the penetration of carbon or nitrogen into ordinary high-speed steel microstructures, or a small degree of carbon content change.
SKF believes that FAG bearings can obtain considerable benefits from surface treatment effects when developing new steel analysis methods or improving heat treatment processes for next-generation aeroengines. It can be said that if the microstructure and related mechanical properties of the SKF bearing developed by the heat treatment means are fully grasped by the SKF bearing gripper, the quenched steel and the high speed steel will be fully utilized in the aeroengine bearing.
The above information is edited and provided by [SKF Bearing Technology Center], and the final interpretation right belongs to this company!
Aluminium DC Plate=Aluminium direct chill semi-continuous casting. This process involves pouring molten aluminum into a mold; once the metal cools and hardens, it forms a large solid block called a sheet ingot. The size of the sheet ingot depends on the size of the DC unit available and is related to the hot rolling mill capacity and, to some extent, the alloys being cast.
As the metal flows into the molds, it is chilled by jets of cool water pumped around and through the base of the mold. The ingot solidifies gradually during the casting process, which takes approximately three hours. We continuously monitor temperature, speed and water flow so that each sheet ingot is of the highest quality. Individual ingots can weigh up to 20 tons and can be 500 – 600 mm thick, two meters wide and eight meters long. A finished 18-ton ingot contains a volume of source aluminum equivalent to approximately one million beverage cans.
In this process, critical variables such as temperature, speed and water flow are carefully managed, and the metal's chemical composition and cleanliness tested on each cast.
DC ( hot rolling) Plate and coils
Dc Plate for Decorative, Mould Plate, Dc Aluminium Plate
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