Centrifugal Casting Process
1-type preheat installed with a good tube brushing the positive and negative rear cover of the zirconium powder alcohol-based coating, preheating tube. Preheat temperature is generally in the range of 180-220 ° C, at this time, the water in the coating can be fully evaporated to reduce the production of pores, so that the adhesive in the paint to play a full role, to prevent the paint was washed, End cover phenomenon.
2 spray, hanging sand 2.1 spray spray pressure 0.45-0.55MPa, spraying the car walking speed 7m / s, spraying speed and spray coating 250g / 20s, coating thickness: small diameter 0.2-0.3mm, large diameter 0.3-0.5 mm, cylinder speed 600-800 rev / s. 2.2 sanding the amount of sand coating or quartz sand in the U-shaped groove, the U-shaped groove into the mold on the axis, so that the preheat to about 200 ℃ mold rotation, tilting U-slot, Coated sand or quartz sand evenly spread on the working surface of the mold, the use of mold heat hardening coated sand, coated sand on the casting thickness of 2-4.5mm.
3 centrifugal casting machine pouring 3.1 casting speed selection, too low mold speed, there will be molten steel rain phenomenon, but also the cast pipe appears loose, slag, the uneven surface of the surface defects; too high mold speed, Cast pipe prone to cracks, segregation and other defects, but also the machine will be a big shock, wear and tear, power consumption is too large. 2-4 inch speed of 850 r / s, 4-8 inch speed of 750 r / s, 8 inches above the speed of 600-650 r / s. Type cylinder speed revision principle: pouring insufficient, reduce the speed; pour out,