Ductile Iron Pipes

Ductile iron pipe refers to the use of more than 18 casting hot metal after the addition of spheroidizing agent, through the centrifugal ductile iron machine high-speed centrifugal casting into the pipe, referred to as the ductile iron pipe, ductile iron pipe and ductile casting pipe. Mainly used for the transmission of tap water, is the ideal choice of water pipeline materials.

The essence of cast iron pipe is ductile iron pipe, because ductile iron pipe has the essence of iron, the performance of steel, so there is this name. Graphite in nodular cast iron pipes exists in a spherical form, and the size of the general graphite is 6-7. In terms of quality, the nodularization grade of cast iron pipe is required to be controlled to 1-3 grades, and the nodularization rate is ≥80%, so the mechanical properties of the material itself have been better improved, with the essence of iron and the performance of steel. After annealing ductile iron pipe, its metallographic structure is ferrite plus a small amount of pearlite, mechanical properties are good, so it is also called cast iron steel pipe.

Procedure for internal grinding of tube die
1.According to the nominal diameter of the tube die, the supporting roller is adjusted to the predetermined spacing according to the machine scale
2. Place the tube die to be ground on the supporting roller.
3. Check and trim the grinding wheel. And according to the specifications of the tube mold selected with its matching grinding rod and grinding head
Adjust the inner grinding length limit block according to the mold specification.
4.First grind the tube die 5 to 6 times, and then check and measure the taper of the hole in the tube die and the size of the socket
5. Case, each grinding amount is 0.2mm. When the inner hole taper and size meet the requirements, automatic grinding; If the taper and bus straightness do not meet the requirements, it is necessary to use segmented grinding
Peel.
6. When grinding the taper, from the socket to the socket, every 500~600mm is an increasing section.
7. When grinding, the grinding head should run smoothly and avoid beating. If beating occurs, the grinding wheel rod should be gently held.
8. During the processing, the inner hole size should be measured at any time, the socket should be measured in three sections within the range of 0~500mm, the socket should be measured at 500mm, the diameter difference of the inner hole should not be less than 0.5mm, and the size should be guaranteed within the processing level of the manufacturing standard.
9. Use manual grinding wheel to grind the socket end. Pay attention to keep the socket form unchanged when grinding
10. After grinding, the surface roughness of the inner hole is 3.2-6.8, and the surface is free of oxide and other impurities.
11. When the tube mold is used later or the quality feedback is notified, the inner wall of the tube mold should increase the grinding amount or the grinding dot should be repeated again to improve the leakage resistance of the tube.

Hot Tags: ductile iron pipes, China ductile iron pipes manufacturers, suppliers, factory, pressure casting, ductile cast iron, nodular cast iron pipe, SSAW pipes, ductile iron casting, butt weld pipe mill