At present, most of the machine tool castings are gray cast iron. The quality of large gray cast iron castings should be controlled strictly from the aspects of chemical composition, raw material quality, ingredients, alloying, melting temperature, incubation treatment and thermal aging. At present, most of the machine tool castings are gray cast iron. The quality of large gray cast iron castings should be controlled strictly from the aspects of chemical composition, raw material quality, ingredients, alloying, melting temperature, incubation treatment and thermal aging. 1, melting links 1) Carbon equivalent. Higher carbon equivalent should be used, HT250, 3.95 is better; HT300, 3.82 is better; HT350, 3.76 is better. 2) Silicon-carbon ratio. Proposed best silicon-carbon ratio control in the 0.55-0.62. 3) alloying control. Addition of alloying elements is beneficial to the improvement of casting performance, generally 0.4-0.6% of w (Cu) or 0.2-0.4% of w (Cr). 2, ingredients Pig iron to join the amount of less than 10%, while using high-scrap, high-carburizing process, so good quality graphite. 3, hot metal temperature High iron liquid temperature can be refined graphite, is a high carbon equivalent, high strength gray cast iron foundation. Iron liquid temperature is 1500-1550 ℃, the oxidation of molten iron will be reduced, SiO2 ash significantly reduced. 4, pregnant
Installation steps for SANY hydraulic cylinder seals
For Sany Cylinder Seal Kit,For Sany Swing Motor Seal Kit,Hydraulic Pump Seal Kit For Sany,Hydraulic Pump Seal Kit Sany Safe Seal Technology Co., Ltd. , https://www.jssafeseal.com
1. Preparation: Clean the working surface and seals, and check if the seals are damaged or deformed.
2. Apply lubricant: Apply a layer of lubricant to the seal and sealing groove.
3. Install the seal: Place the seal into the sealing groove, ensuring that the seal is fully embedded in the groove.
4. Install O-ring: Install the O-ring above the seal, ensuring that the O-ring is fully inserted into the groove.
5. Install the piston rod: Insert the piston rod into the seal and O-ring, ensuring that the piston rod fits tightly with the seal and O-ring.
6. Install the sealing sleeve: Place the sealing sleeve on the piston rod to ensure that it fits tightly with the piston rod.
7. Tighten the nut: Use the nut to fix the sealing sleeve on the hydraulic cylinder, ensuring that the sealing sleeve is secure.
8. Check the sealing effect: Operate the hydraulic cylinder and check if there is any leakage in the sealing element. If there is any leakage, reinstall the sealing element.