The Construction Technique punchings

Construction Technique punching, punching designed to meet the performance under the premise should have a well-structured process, so as to reduce material consumption, ease die manufacturing, extend die life, question productivity, reduce manufacturing costs. To improve the structure of the process of punching, should shape, size and accuracy considerations. 1, round punching outer and inner diameters must meet the requirements of standardization and generalization. This can improve the utilization of silicon, but also the use of existing dies, reduce die size and manufacturing costs. 2, the trough should be easy to manufacture die. That should be simple geometry, dimensions shall be at the transition arc connection. Die fillet radius at the transition should not be less than 1mm. Without fillet radius or fillet radius is too small, die quenching

  4 fire, often due to stress concentration at the corners and cracks. 3, punching notch height will impact die die edge mechanical strength. Notch height is too small, the die easily damaged. For 0.5mm thick silicon steel sheet, its nuclear mouth height of not less than 0.8mm, the pole notch punching damping groove height should not be less than 1.8mm. Similarly, punching the slot width will affect the punch die blade mechanical strength, the slot width should be no less than the corresponding predetermined value. 4, the groove is labeled positive and negative mark punching and circumferential position. Scheduled to mark the groove center line on punching should not coincide with the two adjacent dovetail groove line of symmetry. For medium-sized motor stator salt tablets, do not ask often make two sizes of small semicircle on external factors, in order to identify the positive and negative. Rotor plates are used with sloping bottom keyway doubles as a marker, you do not have a separate tag slot. 5, in order to facilitate the die machining, axial ventilation holes should be rounded. The number of vents shall be equal to a multiple magnetic poles, uniformly distributed along the circumference, in order to avoid unbalanced magnetic circuit asymmetry and machinery. 6, fan punching the maximum chord length or an integer multiple of slightly less than silicon (band) width to facilitate legitimate CD sets. It seems from the punching, transportation, storage, and press-fit process, both sides of the fan-shaped punching is preferably semi-groove, rather than teeth or tooth half. Because of the lower teeth or tooth semi-mechanical strength, easily bent. 7, the pole punching pole tip should have enough radius; between the hole and the hole, the distance between the edge of the hole and punching should not be smaller than the thickness of punching. 8, the dimensional accuracy of punching up to IT8, higher accuracy level will die manufacturing difficulties.