A manufacturing process of double-socket nodular cast iron pipe

Abstract

The invention discloses a manufacturing process of a double-socket nodular cast iron pipe, which comprises the following steps: 1). Put the dotted pouring mold into a centrifugal pipe casting machine, pass cooling water into the outer wall of the pouring mold to cool; put the prepared sand mold The core is installed on the cast steel core frame, and the cast steel core frame is installed to the socket end of the casting mold; 2). After the molten iron is spheroidized and slag removed, it is poured into the fan-shaped bag of the centrifugal pipe casting machine and waits for pouring; 3 ). Start the pipe drawing system of the centrifugal pipe casting machine, and pour the molten iron into the inner wall of the casting mold to start drawing the pipe; 4). After drawing, pull out the double-socket ductile iron pipe, anneal and remove the sand core; 5) .Weld the socket welding ring at the socket; 6).Install the sealing ring in the sealing chamber of the socket, and install the anti-loosening ring in the anti-loosening chamber. The manufacturing process of the sand core used is simple, and the material is not easily deformed; the pipe drawing operation speed setting of the pipe drawing system of the centrifugal pipe casting machine is reasonable, which effectively guarantees the quality of the cast pipe.

Description

technical field [0001] The invention belongs to the field of ductile iron pipe manufacture, and in particular relates to a manufacturing process of a double-socket ductile iron pipe. Background technique [0002] The most common type of joint for ductile iron pipes is a socket slide-in T-type joint. When installing, insert one end of the socket of the cast iron pipe directly into the socket of another pipe, and seal the connection with a sealing rubber ring in the middle. The socket interface form has the characteristics of simple structure, convenient installation and good sealing performance. The interface can adapt to a certain foundation deformation and has a certain anti-seismic ability. At the same time, the deflection angle can be used to realize the long-distance steering of the pipeline. [0003] In the prior art, in the manufacturing process of ductile iron pipes, the sand core installed on the cast steel core frame is the inner core mold of the socket, and the en...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, in the manufacturing process of ductile iron pipes, the sand core installed on the cast steel core frame is the inner core mold of the socket, and the end part plays a role in preventing the leakage of molten iron. In the prior art The sand core used is easily deformed when it is washed by molten iron, so the choice of sand core material is particularly important, otherwise it will directly affect the casting quality of the socket

In addition, the setting of the sealing cavity of the sand mold core and the corresponding model module of the anti-stripping cavity will directly affect the casting shape of the sealing cavity and the anti-stripping cavity. The working surface of the core mold in the prior art is single, and the sealing cavity and The anti-stripping cavity is easy to be deformed due to the accumulation and loss of molten iron and affect the use

In the prior art, when the centrifugal pipe casting machine draws the pipe, its speed remains basically unchanged. If the set pipe drawing speed is too fast, the shape of the cast pipe still in a high temperature state will be affected due to stretching, and its quality will be damaged. , if the speed is too slow, it will affect the production efficiency of cast pipe

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