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Electromagnetic continuous casting method of hollow metal tube blank and device thereof

A hollow metal tube and electromagnetic technology, which is applied in the field of metal material preparation, can solve the problems of difficult to achieve circumferential and axial wall thickness control, impossible renewal of molten metal, and poor uniformity, so as to reduce production processes, reduce energy consumption, The effect of improving efficiency

Inactive Publication Date: 2004-10-06
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are two defects in the production of hollow tube blanks by this method. One is that the molten metal at the solidification end cannot be renewed; the other is that the wall thickness of the tube blank is determined by the natural growth of the solidified shell, and the uniformity is poor, and it is difficult to control the circumferential and axial wall thickness. accomplish

Method used

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  • Electromagnetic continuous casting method of hollow metal tube blank and device thereof
  • Electromagnetic continuous casting method of hollow metal tube blank and device thereof
  • Electromagnetic continuous casting method of hollow metal tube blank and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Taking the example of preparing a hollow high-alloy steel billet with a stirring electromagnetic field generator 7 of Φ100×20 mm, the specific steps are as follows:

[0018] Step 1: Device Preparation

[0019] The stirring electromagnetic field generator 7 adopts two pairs of pole coils, the frequency is 5-60 Hz, the phase angle is 90°, the power supply is 1-6 kW, and the distance between the inner side of each coil and the water-cooled slotted outer crystallizer 11 is 5-10 mm. The material of hot top 2 is high aluminum graphite, the size is Φ140×20mm, and the height is 120mm. The outer crystallizer connecting ring 5 is used to connect the hot top 2 and the water-cooled slotted outer mold 11, the size is Φ110×5mm, and the height is 30mm. The upper end surface of the outer mold connecting ring 5 is located 15mm above the lower end surface of the hot top. The outer diameter of the water-cooled slotted outer crystallizer 11 is Φ140mm, the inner diameter is Φ100mm, the hei...

Embodiment 2

[0027] Taking the medium-frequency electromagnetic field generator 14 to prepare a hollow high-alloy steel billet of Φ100×20mm as an example, the specific steps are as follows:

[0028] Step 1: Device Preparation

[0029] The intermediate frequency electromagnetic field generator 14 is a circular coil made of round and square copper tubes. The inner cavity size of the coil is Φ150mm, and the height is 50mm; the power supply is 20-40kW, and the frequency is 1000-9000Hz. The design of the hollow billet crystallizer is the same as in Example 1. The top plane of the intermediate frequency electromagnetic field generator 14 is 15 mm higher than the lower end surface of the heat top 2 . The fixed composite water-cooled internal crystallizer is the same as in Example 1.

[0030] Step 2: High Alloy Steel Billet Melting

[0031] With embodiment 1.

[0032] Step 3: Electromagnetic continuous casting of hollow billets

[0033] Put the bottom mold 12 into the cavity in the mold, chec...

Embodiment 3

[0037] Taking the composite electromagnetic field generated by the stirring electromagnetic field 7 and the intermediate frequency electromagnetic field 14 to prepare a hollow high-alloy steel billet of Φ100×20 mm as an example, the specific steps are as follows:

[0038] Step 1: Device Preparation

[0039] Stirring electromagnetic field generator 7 is the same as embodiment 1, and intermediate frequency electromagnetic field generator 14 is the same as embodiment 2. The design of the hollow billet crystallizer is the same as in Example 1. The central surface of the stirring electromagnetic field generator 7 is located 30 mm below the liquid surface, and the top plane of the intermediate frequency electromagnetic field generator 14 is 15 mm higher than the lower end surface of the heat top. The fixed composite water-cooled internal crystallizer is the same as in Example 1.

[0040] Step 2: High Alloy Steel Billet Melting

[0041] With embodiment 1.

[0042] Step 3: Electro...

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Abstract

The present invention relates to an electromagnetic continuous casting method of hollow metal pipe blank, in particular it relates to a technological process for applying electromagnetic field in the course of continuously casting hollow metal pipe blank. Said invented technique is characterized by that it utilizes the structure design of internal and external crystallizes of hollow pipe blank and technical scheme of applying low-frequency, industrial frequency, meidum-frequency and high-frequency electromagnetic fields or applying low and industrial frequency and medium-high frequency composite electromagnetic field to outer side of external crystallizer to implement said invented continuous casting process. The wall thickness of hollow pipe blank prepared by said method is uniform, error can be controlled at 1%, roughness can be controlled in 0.2 mm.

Description

technical field [0001] The invention belongs to the field of metal material preparation, and in particular relates to a continuous casting method for applying an electromagnetic field in the continuous casting process of a hollow metal tube billet and a device used therein. Background technique [0002] The output and quality of seamless metal pipes mainly depend on the production of hollow tube blanks. At present, there are two main methods for producing hollow metal tube blanks: one is the perforation method, the main process is to obtain a slab through continuous casting of molten steel, cool the casting slab, process it, and then perforate it after heating to obtain a hollow metal tube blank. The hollow tube blank is rolled or cold drawn to obtain a seamless metal tube. Although the piercing process is relatively mature and widely used in the preparation of hollow metal tube blanks, its disadvantages of low efficiency and high energy consumption are also obvious, especi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/115
Inventor 李廷举金俊泽李丘林温斌姚山曹志强
Owner DALIAN UNIV OF TECH