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Based on analysis and Study on the fracture toughness of materials and other relations and crack development process, we can see that at high values of DN and the existence of circumferential stress conditions, variations have important significance of high speed steel surface treatment and low carbon high speed steel surface hardening depth. Therefore, development of material surface treatment technology, can enhance the surface hardness, and produces compressive stress. The surface treatment material has the following characteristics: excellent resistance to fatigue crack, the second stage, the fracture toughness of core material expansion speed has been low and quenching crack or lack of low carbon content lead to values of higher.
Including such a surface processing method development:
The lack of common high speed steel quenching by laser, electron beam or induction hardening method for local heat treatment, in order to obtain the surface hardened layer. It should be noted that under quenching is in order to improve the fracture toughness.
Get the surface hardened layer by chemical heat treatment method. The method includes the carbon or nitrogen penetration into the microstructures of common high speed steel, or a small change of degree of carbon content.
Linear motion bearing sealing function is the primary factor data to ensure effective sealing, the selection of sealing materials, sealing element first if the basis work, such as the use of the working medium temperature, working pressure, the use and the movement style pattern etc.. The following basic request of sealing materials:
1 NTN bearing wear resistance, no corrosion of metal;
2 oxygen resistant and good anti-aging, durable;
3 NTN bearing high & low temperature resistance, high temperature not synthetic, softening, low temperature hardening;
4 bearing and the working medium to adapt, no swelling, synthesis, hardening;
5 Elasticity and hardness properly, small compression deformation;
6 linear motion bearings has certain mechanical properties, such as tensile strength, elongation;
7 easy forming, low price;