Drawing process of conical ductile cast-iron pipe

Abstract

The invention discloses a drawing process of a conical ductile cast-iron pipe cast by devices, including a sand mold core, a cast-iron core frame, pipe-drawing calipers, a casting mold and a centrifugal pipe-casting machine. The drawing process comprises the following steps: firstly, putting the dotted casting mold in the centrifugal pipe-casting machine; leading cooling water to the outer wall of the casting mold; mounting the casting mold in the centrifugal pipe-casting machine; mounting the sand mold core on the cast-iron core frame; arranging the cast-iron core frame in the bearing port of the casting mold; pouring molten iron in the fan-shaped ladle of the centrifugal pipe-casting machine; then, starting the automatic pipe-drawing system of the centrifugal pipe-casting machine; drawing to mold; and drawing out the conical ductile cast-iron pipe with the pipe-drawing calipers. In the pipe-drawing process, the drawing speed curve of the automatic pipe-drawing system of the centrifugal pipe-casting machine adopts segmental control, and the rotating speed of a casting rotating DC (Direct Current) motor gradually increases and ranges from 800r / min to 1700r / min. The process enables the pipe body of the conical ductile cast-iron pipe to have even wall thickness and internal compact structure and accord with the use performance requirements.

Description

technical field [0001] The invention relates to the technical field of metal pipe processing, in particular to a drawing process of a tapered ductile iron pipe. Background technique [0002] At present, wood, cement and stainless steel are usually used as support frames at home and abroad for the transmission of various high and low voltage power. Among them, wood and cement materials have short service life, high brittleness, and poor ability to resist external forces. Disadvantages, stainless steel is expensive and easy to deform. [0003] The ductile iron pipe produced by the traditional water-cooled metal-type centrifugal casting process is usually 6 meters long, and it is a cylindrical pipe with the same inner and outer diameter of the socket. After connection, it is used to transport fluid substances such as drinking water. Concave areas or trenches with small slopes are usually buried underground. Due to the limitation of insertion depth, they are rarely used for gro...

AI Technical Summary

Problems solved by technology

[0002] At present, wood, cement and stainless steel are usually used as support frames at home and abroad for the transmission of various high and low voltage power. Among them, wood and cement materials have short service life, high brittleness, and poor ability to resist external forces. Disadvantages, stainless steel material is expensive and easy to deform

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