Iron boron swirling flow powder grinding process

Abstract

The invention provides an iron boron swirling flow powder grinding process which is characterized by including the steps of (1) detection of the work state of equipment, (2) safe operation of a grinding system and a collecting system, (3) shut-down of the equipment and safe operation. In the first step of detection of the work state of the equipment, whether equipment cooling water is smooth and whether noise exists in a machine cavity are detected, whether a main shaft belt has a sticking phenomenon is observed, whether connecting screws of the machine are tightly screwed is detected, a main machine motor is started, and whether abnormity exists is observed. In the second step, the operation steps of the grinding system include that an inflation valve is opened, nitrogen is introduced, a fan is started to accelerate air exhaust, oxygen content is measured on an exhaust hole below a feeding hopper, the flow of the nitrogen is reduced when the oxygen content is below 0.5%, a grinding machine is started after five minutes, a feeder is started, voltage of a potentiometer in an electric cabinet is adjusted so that the feeding speed is 200V usually, and what needs to be paid attention to is that the current of a main machine can not exceed 25A. In the second step, the operation steps of the collecting system include that after people see that powder is ground from an observation opening of the feeder, a disc valve above a discharging opening is opened, an upper disc valve is closed after all the powder enters a collecting area, a lower disc valve is opened, and the powder is collected into a rotary material tank; the lower disc valve is closed, a disc valve of a material tank is closed, the rotary material tank is replaced, an air exhaust nozzle of the material tank is opened, the lower disc valve is opened, a discharging ball valve is opened, the air exhaust nozzle of the material tank is closed once after air in the collecting area and in the rotary material tank is completely exhausted, the lower disc valve is closed, and the discharging ball valve is closed. Safe operation of the equipment in the third step includes the steps that on a continuous work state, the situation that a feeding pipeline of the grinding cavity is heated may happen sometimes, feeding is stopped at the time, the residual powder is ground, the equipment is shut down, the amount of the nitrogen is increased, and work is continued after the equipment is cooled. Shut-down operation of the equipment in the third step includes the steps that the main machine is shut down in 5 minutes when no powder is discharged from the discharging opening, and the fan is turned off after several minutes. By means of the technical scheme, the particle size of materials can be effectively controlled, and production efficiency is improved.

Description

technical field [0001] The invention discloses a smelting process of a permanent magnet material, in particular to an iron-boron swirl mill powder making process. Background technique [0002] Rare earth permanent magnets are divided into samarium cobalt (SmCo) permanent magnets and neodymium iron boron (NdFeB) permanent magnets. The magnetic energy product of SmCo magnets is between 15-30MGOe, and the magnetic energy product of NdFeB permanent magnets is between 27-50 MGOe. Known as the "Permanent Magnet King", it is currently the most magnetic permanent magnet material. Although samarium cobalt permanent magnets have excellent magnetic properties, they contain rare earth metal samarium and expensive rare strategic metal cobalt, so its development is greatly restricted. The development of my country's rare earth permanent magnet industry began in the late 1960s. At that time, the leading product was samarium-cobalt permanent magnets. At present, the world sales volume of s...

AI Technical Summary

Problems solved by technology

Samarium-cobalt permanent magnet, despite its excellent magnetic properties, contains rare earth metal samarium and expensive rare strategic metal cobalt, so its development is greatly restricted