How to improve the quality of cast iron pipe fittings
Measures to control hot metal temperature in cast iron pipe fittingsWhen the molten iron temperature is too low and the inner wall temperature of the tube is low, heavy skin defects will occur. When the molten iron temperature is high and the molten iron gas increases, porosity defects can be generated. In the medium frequency furnace, the hot metal should be provided according to the process specification, and the temperature of the inlet and outlet and the cooling rate can be controlled reasonably in the process of production.
Measures to adjust the location of iron pipe chuteFor cast iron pipe chute taphole bent or improper chute taphole distance socket distance, easy to form a skin defect in cast iron pipe socket parts, equipment manufacturing inspection of cast iron pipe fittings must be in production, replacing the cast iron pipe chute taphole elbow when necessary, and adjust the host making iron centrifuge when the pipe in the lower limit, shorten the chute taphole socket from the distance.
Measures are taken in the pipe mould of the cast iron pipe fittingsTo avoid the iron pipe inner wall of mold management lean reduce iron pipe pipe mould run speed, can make a dense and uniform pitting; avoid mold wall cast iron pipe pipe packed too shallow, increase the pressure, wear a good play to nod, can ensure the suitable depth of pitting.For pipes with grease and debris on the inner surface, especially the new cast iron pipe fittings, the grease and sundries on the surface of the cast iron pipe can be removed before use. For the cast iron pipe mould with a crack of a turtle, it is slight to use. When in use, the amount of mould powder should be increased; if the crack of the turtle is serious, the cast iron pipe mould must be replaced in time.
The speed of main machine, the amount of turnover and the speed of pipe die in controlling the cast iron pipe fittings1) in the casting, most of the cast iron pipe flowing from the chute flows forward, but there are still a small number of cast iron pipe, the molten iron flows backward, the cast iron pipe in the rear of the site, there is a "lead flow."".2) for cast iron pipe centrifuge host walk speed too slow (slow to advance flow speed) caused by the quality defects in cast iron pipe production requirements by improving the centrifuge speed, so as to shorten the time of casting.3) for cast iron pipe production sector due to the package of centrifuge turning package is too large (increasing the movement trend of advanced flow ") caused by the quality defects of cast iron pipe centrifuge operation requirements, in strict accordance with the process requirements to reduce the angular speed of fan turning package package.4) the quality defects caused by the high speed of the cast iron pipe fittings and the thinner lead flow of the molten iron require that the speed of the cast iron pipe die be lowered to the lower limit during the production of the cast iron pipe fittings.
