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A method for continuously preparing composite tube blanks by spray forming

A composite tube billet and injection forming technology, which is applied in the field of composite steel pipe manufacturing, can solve problems such as increased operational difficulty, tube billet specifications and length restrictions, and tube billet shedding, so as to achieve simple equipment and procedures, improve performance, and improve production. efficiency effect

Active Publication Date: 2016-07-27
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But its disadvantage is that the substrate, deposition blank and substrate support seat need to move back and forth in a straight line during the preparation process.
[0007] The tube blank production process mentioned in this patent cannot effectively ensure the smoothness of the inner and outer walls of the tube blank in the actual production process. Even if rolling is carried out at the same time during the production process, it can only have a weak effect. Rolling in the lower position can easily cause the center of the billet to shift, and in severe cases, it can even cause the billet to fall off from the dummy rod. It is more difficult to prepare the billet for the composite billet.
The specifications and length of the sprayed tube blanks are greatly limited, and the rolling mechanism placed inside the equipment will cause the overall equipment to be very large, which will increase the difficulty of operation and is unreasonable in actual production

Method used

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  • A method for continuously preparing composite tube blanks by spray forming
  • A method for continuously preparing composite tube blanks by spray forming

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]A composite tube blank with a length of 5 m, an inner layer of 20 mm and an outer layer of 2 mm in thickness was prepared by spray forming.

[0040] After the master alloy in the melting furnace is heated to 1600°C, it is poured into the tundish. When the molten steel flows out from the catheter, the pressure of the atomizing gas reaches 2MPa, and at the same time, the billet moves at a speed of 15mm driven by the supporting and rotating mechanism. ~20mm / min, rotation speed 20~60rpm through the rapid heating induction coil at a constant speed, the surface is preheated to 800°C by induction heating, and then enters the atomization cone area, and gradually forms a composite workpiece. After the first tube blank moves and While rotating, another tube blank is then placed on the support mechanism to form a continuous operation, and finally a composite tube blank with a length of 5m and a composite layer thickness of 2mm is sprayed.

Embodiment 2

[0042] A composite tube blank with a length of 3m, an inner layer of 30mm and an outer layer of 4mm in thickness was prepared by spray forming.

[0043] After the master alloy in the melting furnace is heated to 1580°C, it is poured into the tundish. When the molten steel flows out of the catheter, the pressure of the atomizing gas reaches 2MPa, and at the same time, the billet moves at a speed of 7 MPa driven by the supporting and rotating mechanism. ~10mm / min, the rotation speed is 30~60rpm through the high-frequency induction coil at a constant speed, the surface is preheated to 900°C by induction heating, and then enters the atomization cone area, and gradually forms a composite workpiece. At the same time, another tube blank is placed on the support mechanism to form a continuous operation, and the composite tube blank with a length of 3m and a composite layer thickness of 4mm is continuously sprayed.

Embodiment 3

[0045] A composite tube blank with a length of 10 m, an inner layer of 100 mm and an outer layer of 5 mm in thickness was prepared by spray forming.

[0046] After the master alloy in the melting furnace is heated to 1580°C, it is poured into the tundish. When the molten steel flows out from the catheter, the pressure of the atomizing gas reaches 1.2MPa, and the moving speed of the tube billet is driven by the supporting and rotating mechanism. 5 ~ 7mm / min, the rotation speed is 10 ~ 60rpm through the high frequency induction coil at a constant speed, the surface is preheated to 950°C by induction heating, and then enters the atomization cone area, gradually forming a composite workpiece, moving on the first tube blank While rotating, another tube blank is then placed on the support mechanism to form a continuous operation, and finally a composite tube blank with a length of 10m and a composite layer thickness of 5mm is sprayed.

[0047] The invention can continuously produce ...

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Abstract

The invention discloses a method for preparing a composite tube blank continuously by spray forming. The method comprises the following steps: allowing a molten metal to flow through a liquid guide pipe at the bottom of a tundish to an atomizing nozzle, atomizing the molten metal by a high-pressure high-speed inert gas in the atomizing nozzle into fine particles to form an atomized cone, depositing the atomized particles on a tube blank basal body below, driving the tube blank basal body to move forwards by a rotary tube blank supporting mechanism which is horizontally arranged, after depositing the tube blank completely, driving by the tube blank supporting mechanism to slowly moving out of the equipment, enabling the follow-up tube blank to follow in order to perform continuous production, and at last forming the composite tube blank. The method disclosed by the invention is simple in process, adopts simple equipment, and facilitates continuous production; in addition, requirements on the inner layer basal body tube blank material are low; the tube blank crystal on a spraying layer is fine and small, and is uniform in structure; the method can greatly improve the performance of the composite tube blank, and can be applied under a severe environment; in particular, the tube blank is free of length limitation.

Description

technical field [0001] The invention relates to the manufacturing technology of composite steel pipes, in particular to a method for continuously preparing composite pipe blanks by spray forming. Background technique [0002] The traditional tube blank manufacturing technology can produce seamless tube blanks, but it is difficult to produce composite tube blanks, even if it is to be produced, it is relatively difficult. [0003] Most of the existing technologies for producing composite tube blanks use spray forming. [0004] For example, Chinese patent CN200410022954.9 discloses a method for preparing large-scale rings by spray deposition, which uses inert gas to atomize molten metal or alloy to form particles, which are directly sprayed on the substrate, and deposited by impact, coalescence, and solidification The movement of the crucible and atomizer as well as the rotation and lifting movement of the substrate are all intelligently controlled, and the substrate is heated...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/115
Inventor 赵顺利樊俊飞任三兵乐海荣金雷
Owner BAOSHAN IRON & STEEL CO LTD