Running conductive heating material running method to process ferrous material mixture spring frame body

The alloy composition studied was Nd6Fe81Co8V1B4, which was obtained by high-frequency induction melting of the master alloy melt, and was quickly quenched by a single roll to obtain a thin strip (roll speed 2050 m/s). The obtained strip sample is heated to 750e in a vacuum for heat treatment, and immediately after heating to a predetermined temperature, the furnace is cooled, and the holding time is shorter than 15 s. After the sample is magnetized by 10T pulse, the magnetism and magnetization are measured with a vibrating sample magnetometer. (at room temperature to 900e) and varying characteristics. The microstructure changes were studied by X-ray and scanning electron microscopy, and the crystallization behavior was studied by differential scanning calorimetry.

The results indicate that: (1) The amorphous ribbon obtained by the melt quenching method has two stages of magnetization increase through crystallization, and it is considered that the increase of magnetization is related to the crystallization of the A-Fe phase. (2) In the initial stage of crystallization, when the Fe3B-like phase is crystallized, the grain of the A-Fe phase is refined, and the magnet characteristics tend to be improved. (Qi Ming edited from 5 Japanese Society of Applied Magnetic Gas, 6, 2002, 26 (4): 350353) Production of Fe3B/NdFeB exchange spring magnets by electric heating powder rolling method, spark plasma sintering (SPS), discharge sintering (PAS) method Compared with the traditional powder metallurgy method, bulk magnets can be made from magnetic powder, but each has its own characteristics.

Two samples were studied, one on the market for NdFeB quenched ribbon (sample 1) and the other for Fe3B/NdFeB spring magnet quenched ribbon (sample 2). Sample 2 was rapidly quenched by a single roll of a previously prepared Nd4Fe76B19Al1 alloy melt, and the obtained ribbon was subjected to crystallization heat treatment before electric rolling.

The microstructure and magnetic properties of the two alloy samples before and after EPR were investigated. The results show that: (1) Fe3B/NdFeB amorphous ribbon can obtain large magnets by EPR method, but can not be crystallized during bulk rolling. It can be crystallization heat treatment at 500700e in vacuum.

(2) NdFeB quenching powder (MQ powder) can be made into a block by the EPR method, and the magnetic properties of the bulk magnet are substantially the same as those of the magnetic powder, but the anisotropy cannot be achieved simultaneously with the bulk. (Qi Ming from 5 Japanese Society of Applied Magnetics, 6, 6, 26 (4): 354357) Fe4215Co4215Nb7B8 nanocrystalline alloy in recent decades, for amorphous devices and nanocrystals for magnetic devices (such as transformers and inductive devices) Research and development is very active. Some typical nanocrystalline alloys such as FINEMET (Fe7315Si1315B9Nb3Cu1) and NANOPERM (Fe88Zr7B4Cu1), their nanocrystalline structure plays an important role in their superior soft magnetic properties.

Electric Hand Drill

Electric hand drill is a drilling Tool powered by AC power or DC battery. It is a kind of hand-held electric tools.
Hand electric drill is the largest sales of power tools industry products, widely used in construction, decoration, furniture and other industries, used in the object on the opening or piercing objects, some industries are also known as electric hammer.
The main components of the hand electric drill: drill chuck, output shaft, gear, rotor, stator, housing, switch and cable.
Electric hand drill (pistol drill) - used for drilling metal materials, wood, plastic, etc. When equipped with a positive and negative switch and electronic speed regulating device, it can be used as an electric screwdriver. Some models are equipped with rechargeable batteries, which can work normally without external power supply for a certain period of time.