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Manufacturing process of cast iron platform
2025-12-24
Raw material selection:
Made of gray cast iron or ductile iron, with a carbon content controlled between 2.8% and 3.5%, combined with scrap steel and alloying elements (such as ferrosilicon and manganese iron), melted in a medium frequency induction furnace at a temperature controlled between 1500-1550 ℃.
Mold making:
Using pine or teak wood for CNC carving, with a 2% shrinkage allowance reserved, the machining allowance for the working surface is usually 5-8mm.
Sand casting:
Using furan resin sand process, the hardness of the sand mold reaches 85-90 (measured by B-type hardness tester). Large platforms (over 3m) require pit design, and the sand box strength should withstand a pressure of 10t/㎡ or more.
Pouring and cooling:
The pouring temperature is controlled at 1380 ℃± 20 ℃, and layered pouring technology is adopted (when the thickness exceeds 100mm, the interval does not exceed 30 seconds). During the cooling phase, a stepped cooling system is implemented, with 30 ℃/h controlled above 200 ℃ and natural cooling below 200 ℃.
Precision machining and inspection:
Rough machining: Use a gantry milling machine to remove excess, and initially control the flatness within 0.2mm/m.
Time treatment: Combining thermal aging (holding at 560 ℃ for 6 hours before furnace cooling) and vibration aging (excitation force at 20-50Hz frequency, treatment time ≥ 30 minutes).
Precision machining: The machining flatness of the guide rail grinder reaches 0.01mm/m, and the surface roughness Ra is ≤ 1.6 μ m.
Inspection: Use the coloring method to check the number of contact spots and ensure compliance with the grading standards.
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