1182 results about "Reduction ratio" patented technology

The invention provides a method for preparing a non-oriented silicon steel with high magnetic induction, which comprises the following steps: 1) smelting and casting, wherein the non-oriented silicon steel comprises the following chemical components by weight percentage: 0.1-1% of Si, 0.005-1% of Al, less than or equal to 0.004% of C, 0.10-1.50% of Mn, less than or equal to 0.2% of P, less than or equal to 0.005% of S, less than or equal to 0.002% of N, less than or equal to 0.006% of Nb+V+Ti and the balance of Fe, steel-making, secondary refining and casting to casting blank; 2) hot rolling,wherein the heating temperature is 1150 DEG C-1200 DEG C, the finishing temperature is 830-900 DEG C, reeling at the temperature of greater than or equal to 570 DEG C; 3) flattening, cold rolling with reduction ratio of 2-5%; 4) normalizing, wherein the temperature is not less than 950 DEG C, insulating for 30-180s; 5) pickling and cold rolling, wherein the cold rolling with accumulated reductionratio of 70-80% is carried out after pickling; 6) annealing, heating to the temperature of 800-1000 DEG C with speed of greater than or equal to 100 DEG C, insulating for 5s-60s, slow cooling to the temperature of 600-750 DEG C with speed of 3-15 DEG C / s. Under the prerequisite that the iron loss is ensured, at least 200 gauss of the non-oriented silicon steel magnetic induction can be increased.

A rotating speed of the motor 4 is reduced at a high reduction ratio by using a reduction gear (the first and the second reduction gear), and the unlatch mechanism for conducting unlatch operation of the door lock 1 and the closer mechanism for conducting closer operation of the door lock 1 are separated from each other by the normal and the reverse rotating direction of the second reduction gear. Due to the foregoing, even in the middle of a closing operation conducted by the reverse rotation of the second reduction gear, when the closing operation is stopped and then the motor 4 is normally rotated, it is possible to switch from the stopping position of the closing operation to unlatch operation.