When the track is subjected to alternating contact stress, the large shear stress may cause reciprocating plastic deformation, initiate cracking and expansion, and finally lead to shallow pitting or peeling of the hardened layer, which makes the track and the roller unable to work normally. This phenomenon is called contact fatigue damage. Increasing the shear strength can improve the contact fatigue resistance, the material hardness is high, and the shear strength is also high. Surface hardening treatment of rails and rollers is commonly used in engineering to improve contact fatigue resistance. The determination of the thickness of the hardened layer is essential to ensure that the track and the roller are safe and reliable. If the hard surface layer of the track surface is too thin, peeling of the hardened layer is liable to occur. Therefore, the interface between the hardened layer and the internal base layer should be located at a small shear stress, and the maximum shear stress should be in the hardened layer. Tests show that as the depth of the hardened layer increases, the residual tensile stress caused by surface quenching will increase, and the increased residual tensile stress will accelerate crack propagation and shorten fatigue life. Therefore, under the premise of meeting the requirements of use, the depth of hardening should not be too large. Large-scale hydraulic casting tracks should be made of heat-treated medium-carbon alloy cast steel. The type of steel and heat treatment should be selected according to the strength, toughness and plasticity requirements of the track. The contact surface between the casting track and the roller generally needs to be quenched and hardened to improve the wear resistance of the track and prevent contact fatigue. (Finish) Casement Window Profile Extrusion Dies
Aluminum casement windows are a common type of windows made of aluminum alloy materials. Its characteristic is that the sash can be opened inward or outward and is connected to the window frame through hinges. Casement windows have the following advantages:
1. Strong durability: Aluminum alloy materials have good weather resistance and corrosion resistance and are not easily affected by oxidation and corrosion, so casement windows have a longer service life.
2. Easy to open: Casement windows can be easily opened inward or outward through hinges, providing greater ventilation and lighting space.
3. Good sealing: Casement windows are sealed with sealing strips and sealant strips, which can effectively prevent the intrusion of wind, rain and noise, and provide better heat and sound insulation effects.
4. High security: Casement windows can be equipped with safety devices such as multi-point locks to provide better safety performance and prevent intrusions and accidents.
5. Beautiful and elegant: Aluminum alloy casement windows have a simple and modern appearance, are suitable for various architectural styles, and can improve the aesthetics of the building.
In general, aluminum alloy casement windows are a common type of windows with the advantages of strong durability, easy opening, good sealing, high safety and elegant appearance, and are widely used in various buildings.
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