What positive effects does the nitriding surface treatment technology of conical twin screws have on their overall performance?

1. Improve hardness and wear resistance
The nitriding surface treatment technology can form a high-hardness nitriding layer on the surface of conical twin screws and cylinders, thereby improving the hardness of the screw. For example, the surface hardness of the screw barrel made of 38CrMoAlA high-quality alloy steel can reach above HV950 after nitriding, which is equivalent to HRC55°-58°. This high hardness characteristic enables the screw to reduce wear and extend its service life when running at high speed and under high load. At the same time, the nitriding layer also has good wear resistance, which can resist the scouring and wear of the material on the screw surface and maintain the accuracy and shape stability of the screw.

2. Enhance fatigue resistance
During the nitriding process, a greater compressive stress is formed in the nitriding layer, which makes the conical twin screws and cylinders show a higher fatigue limit and lower notch sensitivity under alternating loads. After nitriding, the fatigue limit of the screw barrel can be increased by 15-35%, which enhances the fatigue resistance of the screw. This is especially important for conical twin screws that need to run continuously for a long time, which can reduce the fracture and failure caused by fatigue.

3. Improve corrosion resistance
The nitride layer also has certain anti-corrosion properties, which can protect the screw surface from erosion by corrosive media. In water vapor and alkaline solutions, the nitride layer shows high corrosion resistance. This allows conical twin screws and cylinders to maintain their performance stability and reliability when used in humid and highly corrosive environments.

4. Reduce friction coefficient
The nitride layer has certain self-lubricating properties, which can reduce the friction coefficient between the screw and other components. It helps to reduce the friction resistance of the screw during operation, reduce energy consumption, and improve the operation efficiency of the equipment. At the same time, reducing the friction coefficient can also reduce wear and heat generation, and extend the service life of the equipment.

5. Improve overall performance stability
The nitride surface treatment technology not only improves the hardness and wear resistance of conical twin screws and cylinders, but also enhances their fatigue resistance and corrosion resistance. These performance improvements make the screw more stable and reliable during operation, reducing downtime and maintenance costs caused by failures. At the same time, the nitrided layer also has a certain uniformity and density, which can maintain the flatness and smoothness of the screw surface and improve the processing accuracy of the equipment and product quality.