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Brief introduction of process flow of neodymium iron boron

1, raw material preparation and pretreatment:

Brief introduction: the process of raw materials weighing, crushing, cutting and derusting pretreatment.

Process equipment: steel cutting machine, drum polishing machine, etc.

2, smelting:

Introduction of the process: after pretreatment of original material praseodymium neodymium, iron, boron and other in accordance with the proportion of ingredients, added to the vacuum melting furnace, in argon protection under high temperature melting after the rejection band. The product of uniform composition, crystal orientation, organization consistency, and avoid the generation of -Fe.

Process equipment: vacuum smelting furnace

3, hydrogen explosion:

A brief introduction to the process: hydrogen decrepitation (hd) process, by absorbing hydrogen characteristic of rare earth intermetallic compounds and the neodymium iron boron alloy is placed in a hydrogen atmosphere, hydrogen along the nd rich phase thin layer into the alloy, to expand and burst and broken, along the nd rich phase layer cracking, to ensure that the main phase grain and neodymium rich intergranular phase boundary complete. HD technology makes the rejection of Nd iron boron become very loose, which greatly improves the milling efficiency and reduces the production cost.

Process equipment: Vacuum hydrogen treatment furnace

4, flour milling:

Technology introduction: jet milling is the material of its own high-speed collision to crush, no wear and tear on the inner wall of the chamber of grinding, no pollution, and can be efficiently powder was prepared.

Process equipment: air mill

5, molding orientation:

Process Description: orientation is the orientation, confusion of powder without grain easy magnetization direction C shaft rotates to the same direction up to obtain the biggest remanence. Pressure type main purpose is the powder pressed into a certain shape and size of the crushed. At the same time as much as possible to keep the grain orientation in the magnetic field orientation degree. We design the forming magnetic field press and static press forming, for special shaped magnet using special tool installed, direct molding, sintered magnet only need to minor surface processing can be put into use, greatly saves the material and the subsequent processing cost.

Process equipment: magnetic field press, and other static press

6, sintering:

A brief introduction to the process of: sintering is crushed a series of physical and chemical changes occurring at high temperatures, is a simple, low-cost, can change the microstructure of material to improve the magnetic properties of the material. Sintering is the final forming process of the material, which has a very important influence on the density and microstructure of the magnet.

Process equipment: vacuum sintering furnace

7, mechanical processing:

Process Description: after the sintering of the neodymium iron boron magnets are blank, need further processing to obtain a variety of different sizes, sizes and shapes of products. Neodymium iron boron magnets due to relatively brittle, poor mechanical properties, generally only the use of grinding and cutting processing.

Process equipment: surface grinder, double end grinding machine, chamfering machine

8, surface treatment:

Introduction: surface treatment of various shapes of rare earth permanent magnets, such as electrophoresis, zinc, nickel, nickel, copper and nickel, etc., in order to ensure the appearance and corrosion resistance of the product.

9, finished product inspection and packaging:

Process Description: the product of a variety of magnetic properties, corrosion resistance, high temperature performance, and so on, to meet the requirements of the packaging, to meet the various needs of customers.


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