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24/04/15

The thirteenth process of magnet production: packaging

After plating the magnet, according to the needs of the guests, packaging or magnetized packaging. In the process of packaging, different levels of protection will be made according to the size of the magnet and the mode of transportation, and every effort will be made to avoid collisions during transportation and express delivery. Because the magnet is very fragile, the packaging link is also very important. The following figure is our several packaging methods: including ordinary foam packaging, vacuum bag packaging, magnetic packaging, plastic tube packaging, etc.

24/04/15

The twelfth process of magnet production process: magnetizing

Magnet magnetizing, as the name implies, is to magnetize the magnetic material or increase the magnetism of the magnet with insufficient magnetism. Generally, a magnetic object to be magnetized is placed in a strong magnetic field formed by a coil through which direct current passes, and the magnetic field in the magnet is catalyzed by an external magnetic field. At present, there are two kinds of magnetizing machines, constant current magnetizing machine and pulse magnetizing machine. A. The working principle of the constant current magnetizing machine: The constant current direct current passes through the coil to make the coil generate a constant magnetic field. Suitable for magnetizing low coercive force permanent magnetic materials, such as ferrite, low coercive force neodymium iron boron. B. The working principle of the pulse magnetizing machine: the instantaneous pulse high current passes through the coil to make the coil produce

24/04/15

The eleventh process of magnet production process: electroplating

Because a large proportion of NdFeB is composed of iron, NdFeB is very easy to oxidize when exposed to air or humid environment. Magnet electroplating is an important work to beautify the appearance of magnets and increase the storage time of magnets. The surface treatment of the magnet mainly includes zinc, black zinc, nickel, copper, gold, silver, epoxy resin, etc. Surface plating is different, its color is not different, the preservation time is not the same, each has its advantages and disadvantages. 1) Zinc: The surface is silvery white and can pass 12-48 hours of salt spray. It can be bonded with some glue (such as AB glue). If the electroplating effect is good, it can be stored for two to five years, and the electroplating cost is low. Kan

24/04/15

The tenth process of magnet production process: chamfering

The black pieces of the magnet blank after slicing are bonded with 502 glue on them. In order to separate them, they need to be boiled in boiling water to remove the cutting oil and separate the glue for subsequent inspection and chamfering and electroplating. The inspection of black flakes is to inspect the semi-finished products after cooking and drying. The thickness of the round flakes is 0.05mm and that of the square is 0.07mm, or the inspection standard is formulated according to the requirements of the finished products of the guests. After passing the inspection, the black sheet will be sent to the chamfering room for chamfering. Chamfering is the first smooth process of electroplating. In order to grind the right angle around the product to a certain radian according to the customer's requirements, and at the same time make the surface of the black sheet smoother and more

24/04/15

The ninth process of magnet production process: slice processing

After punching and other blank materials, the materials are sliced according to a certain shape, and the number of columns is glued together with special glue for 502 magnetic materials to facilitate batch processing. After that, it enters the wire cutting workshop for machining and slicing, which is completed by the inner circle slicer. This process cuts the pillars of the outer diameter required by the guest order into the thickness required by the order, or processes the square magnet required by the guest according to the three directions of length, width and height, and finally cuts out the size of the finished product required by the guest. Source: magnet manufacturer Youlian Magnetics www.youliancy.com

24/04/15

The eighth process of magnet production: machining

Magnet machining is divided into: (1) punching and sleeve holes: punching round bar and square bar magnets into cylindrical or square tube magnets (2) slicing: cutting cylindrical and square tube magnets into circular or square plates by slicer (3) shape processing: the round and square magnets are processed into tile-shaped, fan-shaped, groove-shaped or special-shaped magnets. The shape slicing processing methods include: grinding slicing, inner-circle slicing, multi-wire cutting slicing, wire cutting special-shaped processing. In practical application, the performance and shape of NdFeB magnets are various, such as: round, round (countersunk screw hole

24/04/15

The seventh process of magnet production process: cylindrical grinding

Magnet blanks are put into storage after magnetic properties are tested and judged to be qualified. According to the order demand out of the warehouse into the cylindrical grinder workshop. The commonly used grinding methods for square NdFeB magnet blanks are: flat grinding, two end surfaces grinding, internal grinding, external grinding, etc. Cylindrical NdFeB magnet blank is often used without core grinding, and double end flat grinding. Tile-shaped magnets, fan-shaped, special-shaped NdFeB magnet blanks are multi-station grinding machines. The cylindrical grinder is mainly used for rough grinding and fine grinding of the outer diameter of the cylindrical blank. The rough grinding grinds off the oxidized black skin produced during sintering. The fine grinding is fine-machined to the tolerance range according to the outer diameter tolerance requirements of the finished magnet on the order.

24/04/15

The sixth process of magnet production: sintering and aging

The density of the green body made of the magnetic powder of the magnet after orientation, molding and isostatic pressing is very low, which is a negative factor in the production. The green body contains more pores, which is easy to absorb a large amount of gas, including water, and brings troubles and difficulties to the next process. At the same time, due to the low density of the green body, sintering shrinkage, easy deformation, easy size, so it must be sintered, and the process of sintering operation experience requirements are relatively high. The green body is put into the sintering furnace through two processes: sintering and aging. 1> Sintering; holding for a period of time in the highest temperature range, where the most important sintered body density is increased. relative density with green

24/04/15

The fifth process of magnet production: isostatic pressing

The density of green compacts pressed in the magnetic field directional forming process is about 3.2-3.8g/cm³, while the ideal density of NdFeB magnets after sintering should be about 7.5g/cm³. Therefore, when pressing relatively large cylinders and squares, they need to be put into an isostatic press to increase the density of green compacts through isostatic pressing due to large shrinkage, easy cracking, deformation and size deviation caused by missing angles, after isostatic pressing, the density of the green body is 4.5 g/cm. At present, magnet manufacturers have to go through isostatic pressing except for low-performance small columns (Ф less than 10mm), which are not hydrostatically pressed directly into the sintering furnace after the box is not hydrostatically pressed, while isostatic pressing the green body is to prevent

24/04/15

The fourth process of magnet production process: magnet orientation and molding

Magnetic field orientation of magnet powder is one of the key processes for NdFeB magnet manufacturers to manufacture high-performance sintered magnets. The purpose of magnetic field orientation is to make the easy magnetization direction of each powder particle orientate in the same direction to make an anisotropic magnet, and have the largest remanence Br along the direction of the powder particle c-axis orientation, thereby increasing the maximum magnetic energy product (BH)max value of the magnet. The orientation of the magnet powder has a very important influence on the remanence Br and the maximum magnetic energy product (BH)max of the magnet. NdFeB magnet manufacturers have two purposes for the orientation of the powder: one is to press the powder into a certain shape and size according to the user's requirements

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