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Tundishes and casting method for NdFeB (Neodymium Ferrum Boron) alloy casting pieces by using same

A tundish and alloy technology, which is applied in casting equipment, metal processing equipment, casting melt containers, etc., can solve the problems of uneven casting of alloy melt, product consistency and product quality, and failure to guarantee alloy melt Flow consistency and other issues, to achieve the effect of uniform casting, simple structure, consistent flow

Active Publication Date: 2015-01-28
ARCFL TECHNOLOGY LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current common solution is to directly pour the alloy melt onto the rotating crystallizer through the crucible, and install an angle sensor in the crucible to control the pouring angle of the crucible. Due to the different pouring angles of the crucible, the flow rate of the alloy melt is also different, thus To achieve the purpose of controlling the flow rate of the alloy melt, but this method of direct pouring of the crucible is easily restricted by the deformation of the crucible due to slagging during the smelting process, and cannot guarantee that the alloy poured onto the rotary crystallizer during each casting process The consistency of the flow rate of the melt makes the casting of the alloy melt uneven, and the alloy melt is doped with some impurities such as slag, which has a potential adverse effect on the consistency and quality of the product.

Method used

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  • Tundishes and casting method for NdFeB (Neodymium Ferrum Boron) alloy casting pieces by using same
  • Tundishes and casting method for NdFeB (Neodymium Ferrum Boron) alloy casting pieces by using same
  • Tundishes and casting method for NdFeB (Neodymium Ferrum Boron) alloy casting pieces by using same

Examples

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example 1

[0037]Prepare and produce sintered NdFeB with brand name 50H. Ingredients: praseodymium and neodymium 29wt%, boron iron alloy 5.04wt%, dysprosium iron alloy 1.2wt%, cobalt 0.6wt%, aluminum 0.2wt%, copper 0.1wt%, gallium 0.2wt%, the rest is iron, The total weight reaches 600kg, melted in a vacuum induction intermediate frequency melting furnace above 1400°C, and cast at a temperature of 1400°C±10°C, the casting time is 9~16min, and the liquid level of the melt in the upper tundish 1 is controlled between 5mm-60mm , the liquid distribution outlet of the lower tundish 2 has a height of 5mm and a width of 400mm, which can ensure a constant control of the casting speed of 45~50kg / min. The products between 0.35mm and 86% of the total products, and the flash and curling phenomenon of the products completely disappeared, which shows that the method of using the tundish for NdFeB alloy casting can fully ensure the uniform casting of the alloy melt. After the subsequent process of hydr...

example 2

[0039] Prepare and produce sintered NdFeB with the brand name of 38SH. Ingredients: praseodymium and neodymium 31.7wt%, boron iron alloy 4.9wt%, dysprosium iron alloy 1.9wt%, cobalt 1.2wt%, aluminum 1wt%, copper 0.2wt%, gallium 0.1wt%, the rest is iron, The total weight reaches 600kg. It is melted in a vacuum induction intermediate frequency melting furnace above 1450°C, and cast at a temperature of 1450°C±10°C. The casting time is 9~16min. The liquid level of the melt in the upper tundish 1 is controlled between 5mm-60mm. , the liquid distribution outlet of the lower tundish 2 has a height of 5mm and a width of 400mm, which can ensure a constant control of the casting speed of 45~50kg / min. The products between 0.35mm and 89% of the total products, and the flash and curling phenomenon of the products completely disappeared, which shows that the method of using the tundish for NdFeB alloy casting can fully ensure the uniform casting of the alloy melt. After the subsequent proc...

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Abstract

The invention belongs to the field of casting devices and technologies for casting pieces and discloses tundishes and a casting method for NdFeB (Neodymium Ferrum Boron) alloy casting pieces by using same. The tundishes are characterized by comprising an upper tundish (1) and a lower tundish (2); the upper tundish (1) which is arranged under a pouring opening of a crucible (3) is used for collecting alloy melt flowing from the crucible (3); the lower portion of the upper tundish (1) is communicated with the upper portion of the lower tundish (2); a liquid level controller (105) and an upper limit sensor (108) are arranged inside the upper tundish (1); the lower tundish (2) is arranged at one side of a rotary crystallizer (5); a position of the lower tundish (2), which is close to the rotary crystallizer (5), is provided with a distributive liquid outlet (202); the alloy melt is uniformly casted on the surface of the rotary crystallizer (5) through the distributive liquid outlet (202). The tundishes and the casting method for the NdFeB alloy casting pieces by using same have the advantages of being capable of purifying the NdFeB alloy melt, removing impurities in the melt, guaranteeing the alloy melt uniformly casting on the rotary crystallizer and the like.

Description

technical field [0001] A tundish and a method for casting neodymium-iron-boron alloy slabs by using the tundish belong to the field of slab casting equipment and technology, and in particular relate to a tundish and a technique for casting alloy slabs by using the tundish. Background technique [0002] NdFeB permanent magnet alloy has very excellent permanent magnet properties. In NdFeB permanent magnet alloy, the Nd2Fel4B phase accounts for more than 90% of the total volume, and the others are neodymium-rich phase, boron-rich phase and metal neodymium oxides such as Nd2O3, etc., NdFeB permanent magnet alloy is also called the third generation rare earth permanent magnet alloy. At present, with the popularization and application of the vacuum quick-setting (strip casting) process in the sintered NdFeB magnet manufacturing industry, the quality of the NdFeB alloy cast sheet has a great influence on the performance of the sintered NdFeB magnet. How to control the vacuum quick-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D41/00
Inventor 孙兆栋
Owner ARCFL TECHNOLOGY LIMITED