37results about How to "Magnetic influence" patented technology

The invention discloses a method for manufacturing a plastic bonded permanent magnet rotor with a buffering layer, belonging to the field of permanent magnet rotors. The technical scheme is that: the plastic bonded permanent magnet rotor comprises a metal shaft and a bonded permanent magnet; and the buffering layer is formed between the metal shaft and the bonded permanent magnet. The manufacturing method comprises the following steps of: I, molding and processing the buffering layer onto the outer side of the metal shaft by adopting a die pressing or injection molding way to form a semi-finished product; and II, molding and processing the bonded permanent magnet onto the outer side of the buffering layer by adopting an injection molding way or die pressing way to form a finished product. The invention has the beneficial effects that: the plastic bonded permanent magnet rotor with the buffering layer designed by the invention can be produced without changing the conventional production process and production equipment in the manufacturing method, and industrialization is facilitated; in the manufactured plastic bonded permanent magnet rotor, a buffering layer structure is arranged, so that the plastic bonded permanent magnet rotor can be effectively prevented from cracking in the molding processing or using process; and simultaneously, the cost is lowered.

The invention discloses a method for carrying out electronickelling on a neodymium-iron-boron magnet. The method particularly comprises the following steps of: carrying out a pretreatment process, a nickel preplating process, a water washing process, a semi-bright nickel plating process, the washing process, a bright nickel plating process and a water washing process on the neodymium-iron-boron magnet, wherein a first electronickelling solution which comprises nickel sulfate, boric acid, sodium succinate, sodium carboxyethyl sulfonate and water is adopted for the nickel preplating process; a second electronickelling solution which comprises nickel sulfate, diammonium hydrogen citrate, the boric acid, ammonia water and water is adopted for the semi-bright nickel plating process; the first electronickelling solution is free of chloride ions, and the first electronickelling solution contains the sodium succinate and the sodium carboxyethyl sulfonate; the second electronickelling solution contains a proper amount of diammonium hydrogen citrate. The method disclosed by the invention can ensure that the neodymium-iron-boron magnet has better magnetic property by reducing the influence of an electroplating process on the magnetic property of the neodymium-iron-boron magnet and achieves uniform distribution of coating thickness when a product with a smaller end part angle is electroplated.

The invention discloses an experimental device for exploring factors influencing the magnitude of an electromagnetic force, belonging to the field of physical experiment equipment. The experimental device comprises a power supply group and multiple groups of iron nails, wherein the iron nails are wound with leads, the leads winding the iron nails form a shunt circuit with the power supply group, and the numbers of turns of the leads winding different groups of the iron nails are different; the experimental device is further provided with multiple groups of placement blocks for placing small steel balls, and multiple groups of the iron nails are respectively vertically mounted right above multiple groups of the placement blocks; and the power supply group comprises multiple groups of battery boxes for placing batteries, the battery boxes are connected together in series, and the adjacent battery boxes are detachably connected. Multiple groups of the battery boxes are detachably mounted,and multiple groups of iron nails wound with leads with different numbers of turns are arranged, so that students can conveniently explore whether the electromagnetic force is influenced by differentnumbers of turns of the leads and different current magnitudes.

The invention discloses a spinning forming method for manufacturing a magnetically soft alloy cylindrical part. The method includes the steps that the geometric dimensions of a cylindrical blank are determined according to the principle that the material size is not changed in the plastic deformation process, the actual wall thickness of the thin-wall cylindrical part, the requirement for trimming after forming and the design principle that the wall thickness reduction rate is 40%-80%; the pipe blank is heated to 700 DEG C, and preheating is carried out after 0.5h of heat preservation; multi-pass staggered spinning forming is carried out on the cylindrical blank to enable the wall thickness to be reduced to a predetermined value; a workpiece subjected to spinning forming is heated to 1100-1180 DEG C in vacuum protection, heat preservation is conducted for 3-6h, then the workpiece is cooled to 600 DEG C at the speed which is not higher than 200 DEG C / h and continues to be cooled to 200 DEG C at the speed not smaller than 400 DEG C / h, and the workpiece is discharged out of a furnace and subjected to final heat treatment to improve the magnetic performance of the material; and excess materials at the two ends of the workpiece are cut off, so that a final product is obtained. By means of the spinning forming method for manufacturing the magnetically soft alloy cylindrical part, the cylindrical part with high forming quality and good soft magnetism performance can be obtained, and the defects that a traditional machining method is low in material utilization rate, poor in forming quality, prone to flux leakage and the like are overcome.

The invention relates to a flat strip system (100) for use on a carding machine (K) for cotton, chemical fibers or the like, said flat strip system comprising an elongated flat strip (102) and a long shaped clothing strip (104) on which a magnetic element (103) is fastened, said clothing strip having a back side (107) facing the flat strip (102) of the clothing strip layer, the back layer contains ferrous metal material. Correspondingly, the clothing strip (104) can be detachably fastened magnetically to the magnetic element (103) of the flat strip (102) by means of the backing layer (108) of the clothing strip. The back layer (108) has a plurality of segments (110) which respectively contain ferrous metal material, wherein the segments (110) are arranged spaced apart from each other and in the longitudinal direction of the clothing strip (104) ( L) separated from each other.

The invention provides a magnetic type fixing structure adaptive to a desktop product and can absorb a pedestal of the desktop product onto a table surface. The magnetic type fixing structure comprises a magnet and a fixing member, wherein the magnet is slideably disposed in an accommodating groove formed in the bottom of a pedestal via the fixing member, so the magnet can project out of or recessed into the pedestal; and therefore, the magnetic type fixing structure can be directly adhered to a metal surface and effect on magnetism by distance can be reduced.

The invention relates to a method for forming an aluminum coating on the surface of a neodymium iron boron magnet and belongs to the technical field of magnet surface treatment. An adopted mechanical aluminum-plating process comprises the following steps of: colliding an impacting medium having aluminum coating powder on the surface thereof with the surface of a plated piece under an action of external mechanical vibration, thereby transferring the aluminum coating powder from the surface of the impacting medium to the surface of the plated piece; heating and solidifying the plated piece; and finally, forming a corrosion-resistance coating on the surface of the plated piece. The method provided by the invention has the advantages that the process is simpler and has a shorter time, the consumption of resources such as water, electricity and the like is low, and the raw materials used in the method, such as aluminum, epoxy resins and the like are low in costs, so that the total cost is greatly lowered.

The invention discloses a bottom-mounted electromagnetic stirrer used for a direct current (DC) electric-excitation melting furnace, consisting of an exciter coil, an iron core, a yoke iron, a collector ring, a mainshaft, a bracket, a rectifier system and a trailing system. The electromagnetic mixer is mainly characterized in that a DC power supply supplies the power to the exciter coil, namely, the magnetic field source of the stirrer is provided by a DC electromagnet consisting of a magnetic pole which consists of the iron core and the coil with DC. The stirrer has low material cost, the magnetism is not affected by the environmental temperature, the coil can be replaced during the malfunction, and therefore, the mixer has more advantages than an electromagnetic stirrer working at low frequency and a permanent magnetic mixer which uses the permanent magnets.

The invention provides non-oriented silicon steel with excellent magnetism and for a drive motor of an electric car. The non-oriented silicon steel comprises, by weight, 1.0 to 3.5% of Si, 0.5 to 2.0%of Al, 0.5 to 2.0% of Mn, no more than 0.003% of N, no more than 0.002% of S, no more than 0.003% of C, no more than 0.05% of P and no more than 0.05% of Cu. The production method for the non-oriented silicon steel comprises the following steps: smelting and casting; heating of continuously cast billet; rough rolling; finish rolling; reeling; normalizing; pickling; single-stage cold rolling; annealing; segmental speed-variable cooling; and natural cooling to room temperature for subsequent usage. With the method in the invention, the total number of AlN, MnS and Cu<x>S precipitates is no morethan 200 * 10<6> / mm<3>, the average size of the precipitates is no less than 0.50 [mu]m, and residual stress after annealing and cooling is no more than 70 MPa, so unfavorable influence of the AlN, MnS and Cu<x>S precipitates and residual stress on magnetism is effectively inhibited, and the produced non-oriented silicon steel for the drive motor of the electric car has a thickness of 0.27 to 0.35 mm, P<1.0 / 400> of no more than 16.0 W / kg and B<5000> of no less than 1.65 T.

The invention belongs to the technical field of metal casting machining, and particularly relates to a dual box sand mould used for aluminum alloy component casting. The dual box sand mould comprisesan upper sand box and a lower sand box. The upper sand box and the lower sand box are fixed through bolts. Pin holes are formed in the outer walls of the sand boxes. Baffles are arranged on the outersides of the pin holes. Clamped connection grooves used for fixing the baffles are formed in the right sides of the baffles. Strong magnet lantern rings are arranged in screw holes. Cushion pipes arearranged in the strong magnet lantern rings, and corrugated springs are sleeved in gaps between the outer sides of the cushion pipes and the screw holes. External threads matched with internal threadsin the screw holes are arranged on the upper segments and the lower segments of screws of the bolts, the surface of the middle segment of each screw is free of a thread, and two contraction necks with the diameters gradually reduced are arranged in the middle segment of each screw. Limiting pins are arranged in the pin holes, and U-shaped grooves are formed in the front ends of the limiting pins.The sand mould is high in structural strength and strong in fastening function, the effects of vibration resistance and heat-resisting deformation prevention of the sand mould are relatively better,the screws cannot be locked in the casting process, and demolding is more convenient.