Stamping progressive die manufacturer: motor stator punching sheet die


The stamping progressive die manufacturer tells you that the shape of motor stator punching dies is generally forged from round steel to meet the rough requirements of its required dimensions. Ordinary Cr12 type steel, Cr12MoV or CrWMn type steel is used for motor stator punching dies. After forging, it can improve the crystal carbide unevenness of steel, crush large carbide, refine carbide, reduce bias, meet the requirements of grade 2 carbide, improve the process performance and use performance of Cr12 and other types of steel, and prolong the service life of the die.


Cr12 steel for motor stator punching dies has low thermal conductivity and poor plasticity. When heated, the temperature difference between the surface and the middle generates temperature stresses and the critical point generates tissue stresses, which will lead to core rupture of the material. In addition, there are many forging crack defects due to the narrow range of heating and forging temperatures for these materials.
After forging Cr12 round steel into square die blanks, parallel cracks tend to appear in the middle of the two opposing planes of the rectangular body, typically 10 ~ 1 ~ 3 mm long, 1 ~ 3 mm short, and about 5 mm deep. This phenomenon is observed that the more uneven the crystal carbide is, the longer the crack length is, and the crack will be terminated when there are few crystal carbide particles.


The reason for the motor stator punching die: the crystal carbide segregation in the steel is very severe. This high chromium, high carbon Leyland bulk steel has a large amount of excess carbides and large segregation, which reduces the strength and toughness of the steel.
When initially forged, the hammer is too heavy and the forging direction is incorrect and limited to radial forging. When the deformation is too large, cracks appear first in the middle of the round steel, i.e. in the area with little austenite and a large number of crystalline carbide bodies. The strength of a high temperature forged billet is much higher than that of a high temperature austenitic billet with better plasticity. Cracks appear in austenite with very small widths, which are difficult to find and fill with oxide after forging. Cracks are found in the middle of the rectangular body relative to the plane when the motor stator punching die blank is cooled to room temperature.


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