A forming process suitable for preparing water-cooled metal type centrifugal ductile iron pipe

A technology of centrifugal nodular cast iron and forming process, which is applied in the field of cast iron pipe preparation, can solve the problems affecting the quality of iron cast pipe, desulfurization, improper spheroidization process, etc., and achieve good application effect, high appearance quality and improved mechanical properties.

Active Publication Date: 2016-06-29
SICHUAN CHUANJIAN PIPES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (2) In the production process, the treatment process of desulfurization, spheroidization and inoculation of molten iron is improper, which seriously affects the quality of cast iron pipes

Method used

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  • A forming process suitable for preparing water-cooled metal type centrifugal ductile iron pipe
  • A forming process suitable for preparing water-cooled metal type centrifugal ductile iron pipe
  • A forming process suitable for preparing water-cooled metal type centrifugal ductile iron pipe

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Effect test

Embodiment 1

[0044] The invention proposes a molding process suitable for preparing water-cooled metal type centrifugal nodular cast iron pipes, including the preparation process of using pig iron to prepare molten iron, spheroidizing the molten iron, centrifugal pouring, and annealing to obtain cast iron pipe moldings. It not only has a wide range of applications, It also has many advantages such as high appearance quality, fine material structure, high production efficiency and long service life.

[0045] In this example, the specification of the water-cooled metal type centrifugal ductile iron pipe molded product prepared is DN200mm, and the steps are as follows:

[0046] A: Preparation of molten iron: Use a blast furnace or cupola to smelt pig iron at high temperature to obtain molten iron with a sulfur content of 0.02% and a carbon equivalent fluctuation value of 0.1%;

[0047] B: molten iron spheroidization: the molten iron obtained in step A is sent to the spheroidization station, ...

Embodiment 2

[0054] The difference between this embodiment and Embodiment 1 is that the spheroidization process involved in this embodiment is the flushing spheroidization method, and the structure of the spheroidization package 3 is as follows: image 3 As shown, the bottom of the spheroidizing bag 3 and one side of the dam of the spheroidizing bag form a groove 5 for accommodating the nodulizer and the inoculant. and inoculant, in actual operation, the molten iron is tapped by the spheroidizing wire feeding mechanism 1 along the spheroidizing ladle dam on the side where the groove 5 is not formed, namely image 3 indicated by the arrow symbol.

Embodiment 3

[0056] The difference between this embodiment and Embodiment 1 is that the spheroidization process involved in this embodiment is the flushing spheroidization method, and the structure of the spheroidization package 3 is as follows: Figure 4 As shown, the bottom of the spheroidizing bag 3 and one side of the dam of the spheroidizing bag form a groove 5 for accommodating the nodulizer and the inoculant. and inoculant, in actual operation, the molten iron is tapped by the spheroidizing wire feeding mechanism 1 along the spheroidizing ladle dam on the side where the groove 5 is not formed, namely Figure 4 indicated by the arrow symbol.

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Abstract

The invention discloses a forming process suitable for preparing a water-cooling metal mold centrifugal nodular cast iron pipe. According to the forming process, pig iron is utilized, molten iron preparing, molten iron nodulizing, centrifugal casting and annealing are carried out, and then the finished cast iron pipe is obtained. The forming process comprises the steps of molten iron preparing, molten iron nodulizing, centrifugal casting and annealing, and the cast iron pipe conveyed out of an annealing furnace serves as the finished cast iron pipe after being cooled. The technological method discloses a series of preparing technologies from molten iron preparing, molten iron nodulizing and centrifugal casting to annealing in the finished high-quality water-cooling metal mold centrifugal nodular cast iron pipe preparing process, and is suitable for preparing the cast iron pipe of DN80-1000 mm. The forming process is wide in application range, and has the advantages that the appearance quality is high, the material texture is fine, the production efficiency is high, and the service life is long.

Description

technical field [0001] The invention relates to a molding process suitable for preparing water-cooled metal type centrifugal nodular cast iron pipes, specifically relates to the manufacturing process of water-cooled metal type centrifugal nodular cast iron pipes and belongs to the technical field of cast iron pipe preparation. Background technique [0002] Since the 1990s, my country has produced centrifugal ductile iron pipes with a diameter of DN2600mm and a length of 8000mm by using the centrifugal casting method of internal spray paint, realizing the mass production of centrifugal ductile iron pipes. Of course, due to the excellent performance of centrifugal ductile iron pipes , was quickly adopted by the water supply system, and has become the preferred material for water supply pipes, and like other industrially developed countries, it has completed the transformation from gray cast iron to ductile iron, from continuous casting process to centrifugal casting process in a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10C22C37/04B22D1/00B22D13/00C21C1/10B22D13/10
CPCB22D1/00B22D13/00B22D13/10C21C1/10C22C37/04C22C37/10
Inventor 李晓兵许顺鲜其祥刘杲
Owner SICHUAN CHUANJIAN PIPES
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