The punching and cutting process of the iron core punch sheet(1) The size of the punch shall conform to the drawing. There are many sizes on the iron core punch, but it can be attributed to the internal size and the match size. Internal dimensions such as grooves, ventilation holes, marking slots, and various diameters on magnetic electrode punching sheets, etc., generally use the H10 accuracy level, and higher accuracy is unnecessary. The error caused by the irregular wall and hole wall after installation is much greater than the error of the punch itself. The size of the match, such as the outer circle of the iron center, the inner circle of the iron center, and the size of the shaft hole to be matched with other parts, the accuracy level is related to the processing process used. 2, the shape deviation must meet the requirements of the pattern. The coaxiality of the inner circle and the outer circle of the stator punch shall not be too poor. When the inner and outer rounds of the punch sheet are pressed at the same time, the coaxial degree is 0.04-0 .06 mm. When the inner and outer parts of the punch are divided into two parts, the coaxial degree can be appropriately relaxed. 3, the alveolar distribution should be uniform. The degree of slot must be accurate, and the difference between the maximum and the minimum tooth width should meet the requirements of the pattern. Otherwise, it will lead to magnetic imbalance. 4, punch thin and uniform, the surface is almost whole, punch cut and the burr on the small. The burr on the small and medium sized motor stator punch shall not be greater than 0.05 mm. The burr of the cast aluminum rotor punch should not be dry 0.1 mm. The insulating layer on the surface of the punch sheet should be thin and uniform, with good dielectric strength, oil resistance and moisture resistance. 6, work noise. Cold stamping is an impact job, and each time it is stamped, it makes a noise. Shear shop is one of the most affected areas of noise pollution. 7, rush cutting speed, pressure is large, prone to personal accidents. Due to the long mold manufacturing cycle and high manufacturing costs, it is not economical to adopt cold stamping technology when the number of workpieces is not large. Only in mass production, the cost of die manufacturing has little impact on the cost of the workpiece, so the cold stamping process becomes an economical and reliable processing method. The type of iron core punch piece is different according to the shape of the iron core punch piece. The iron core punch piece is divided into a round punch piece, a fan-shaped punch piece, and a magnetic pole(shovel-shaped) punch piece. The round punch piece is usually used in the medium and small AC motor and DC electromechanical pivot center. The magnetic pole core of DC motor and synchronous motor is usually pressed by magnetic pole punch. Technical Requirements for Iron Hearts
The first process of the cutting process of the iron core punch(2) 1. The first process of the cutting iron core punch is the cutting material. This is the cutting of the entire Silicon steel plate into a bar of a certain width, or the whole roll of electrician steel. Tiancheng has a certain width of the tape. The width of the strip or strip shall be slightly greater than the outer diameter of the iron core punch for punching. 2, according to the use of different types of punching mode, the punching method is single, complex, and grade. Therefore, the punching process of the punch piece also has a single punching slot, a re-examination punching slot, and a multi-position step punching. The punching method of the punching film is mainly determined by the structure and production type of the punching film. A single punching slot is on the punching machine or high-speed punching machine equipped with a single punching die, and the stator or rotor blank piece fixed on the positioning device is driven by the dividing mechanism, and the groove shape is rushed out in turn. The equal precision of the slot shape depends on the accuracy of the equal degree mechanism of the punching machine and the positioning accuracy of the blank piece. When punching sub-slots, shaft holes and key slots are commonly used for positioning or outer circle and marking slots. Using the latter positioning method, the degree of groove is higher, the positioning error is smaller, but the production efficiency is lower. The production efficiency of the single type punching groove is mainly determined by the speed of the punching groove. The high-speed punching machine adopts a cam worm scoring mechanism, and the precise punching speed is fast. When punching a small punching piece, it can punch 1000-1500 times per minute. The single-type punching slot is easy to manufacture because of the simple structure of the punching die, and it is easy to adjust when punching different sizes. It is suitable for punching more varieties and less batch. The B double punch slot is on the punch bed equipped with a recoil die, and all stator or rotor slots are rushed out in one process, and sometimes other parts can be rushed out at the same time. The whole round punch of the stator and rotor of a small asynchronous motor is usually made by two or three processes. The inner circle and outer circle of the stator punch are generally rushed out at the same time in the same process to ensure its coaxial degree. The fan-shaped punch can not be divided into processes and is made up of one rush. Duplex punching slot production efficiency, punch precision is good, but the mold manufacturing is more complex for punching fan punch and large batch round punch. C multi-position step punch system is to install multi-position step punch die on a high-speed automatic punch bed, use continuous feed material, punch stator and turn to punch on several work positions. The structure of multi-position level punching die is complex, and the requirements for accuracy and service life are stricter. The mold manufacturing is complex, but the punch is high in efficiency and is often used to punch large-scale production of small asynchronous motors with a height of 160mm and below.