Research and Application of New Process for Manufacturing Motor Core
With the development of China's economy, the demand for small and medium-sized motors has increased rapidly. The stamping process has adopted some new technologies and new technologies, which have improved the degree of mechanization and automation, improved working conditions, and improved the quality of the chips and labor productivity. At the same time, it has made some progress in exploring the reform of traditional crafts.
(1) Chemical etching method to produce "punching sheet". The chemical etching method is to chemically etch both sides of the silicon steel sheet, and apply the anti-corrosion agent to the punching sheet (retained portion), and the shapes coated on both sides should be accurately overlapped. Originally used in the photo method, the cost is high and the efficiency is low. Currently in the trial of silk screen printing methods in the textile industry. Advantages of the chemical etching method: 1) Do not die, save the cost of the mold, and reduce the production cycle: 2) No need for God, reduced investment, safe production, and no noise 3) No need for anti-image processing, because of the punching The anti-corrosion contact agent can be used as the insulation between the sheets, 4) no annealing, no burr and internal stress, no influence on the electromagnetic performance, and the soft silicon steel sheet which has been over-fired can be directly used.
The process is roughly as follows: 1) enlarge the drawing according to the part drawing; 2) zoom in to the actual part size; 3) copy multiple images in the step-multiplied camera and make the same negative two-point, after alignment Riveted together; 4) After the plate is coated, it is sent between two negative films, sensitized, developed, washed away from the unimaged portion of the coating; 5) corroded.
The chemical etching method can not only manufacture small motor punches and some parts, but also has a production line for producing turbine generator punches by etching.
(2) Powder metallurgy core. The iron powder is added with phosphorus, copper, molybdenum (0.5% of each of phosphorus and copper, and 1% of molybdenum), and the whole core is formed by pressing, sintering, etc., replacing the silicon steel sheet. The performance of the prepared sample: B25=1.4~1.5 special, B50=1.46~1.53 special; P10/50=4.0~4.5 watt/kg, P15/50=8.0~8.7 watt/kg. Close to the performance of D11 silicon steel sheet.
The powder core is manufactured by a simple method, and the process is: firstly, a small amount of fine organic matter is mixed into the iron powder, pressed into a prescribed shape under a pressure of 600 MW/m 2 , and then sent to the furnace for solidification. When the powder is selected, the magnetic properties of the powder core can be improved and made into a directional core. Its performance; B10=0.33~0.47 special, B50=1.12~1.23 special, the iron loss under the same volume is equivalent to 1.0 mm thick D11 silicon steel sheet. A foreign company tried on the stator of the ultra-small DC motor rotor and the single-phase AC commutator motor. The performance is very close to that of the silicon steel sheet; the efficiency is slightly lower, and the rated current is increased by about 5~10%. If it is reset according to the characteristics of the powder metallurgical core, the performance can be improved.
(3) Pressing the iron core. A foreign company recently took a V-shaped groove on a punching piece and then pressed it to form a core. This core eliminates the process of welding and adding buckles, and the rotor core cast aluminum can no longer use the false shaft.
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