Single -slot stamping is a stamping process relative to double-slot stamping. Single-slot stamping is used for motor stator and rotor core laminations. Its mold design and manufacturing are relatively simple, making it suitable for small-batch, multi-variety production, and it features low cost and rapid modification. With the development of high-speed slotting machines and the continuous improvement of production efficiency, the single-slot stamping process has also developed rapidly. Ms. Can will briefly discuss the single-slot stamping process with you today.
In view of the above, most motor manufacturers use single-slot punching before mass production of the product; for extra-large motors, due to the cost of investing in double-slot punching dies and equipment capacity issues, single-slot punching is also used.
Another advantage of single-slot punching is the consistency of slot dimensions. In compound punching dies, the slots of the stator or rotor are completed in one go on the same lamination. The number of slots corresponds to the same number of punches, and it is still somewhat difficult to achieve complete consistency in the size of the punches. In contrast, single-slot punching completes the punching of all slots with the same punch, resulting in better consistency of slot dimensions.
The choice between single-punch, double-punch, and progressive dies during the stamping process must be determined based on the actual situation.
Types and structural characteristics of stamping dies
From a technological perspective, stamping dies can be divided into three types: single-stroke dies, double-stroke dies, and progressive dies . A single-stroke die has only one independent cutting edge, punching out a hole or dropping a piece of material in one stroke of the press, such as single-hole slotting dies and shaft hole dies.
The advantages of single-stamp dies are their simple structure, short production cycle, low cost, and ability to produce stamped parts quickly. Their disadvantages are low production efficiency and poor workpiece quality. They are only suitable for new product trials or small-batch production.
Double-stroke dies have two or more closed cutting edges, allowing them to complete all or most of the workpiece's shape and dimensions in a single stroke. Examples include stator slot double-stroke dies and three-ring blanking dies. The advantages of this type of die are high workpiece quality and high production efficiency; however, its structure is relatively complex, requiring advanced manufacturing technology, resulting in long production cycles and higher die costs. Currently, most small and medium-sized motor factories are vigorously developing double-stroke dies.
Progressive dies consist of two or more compound dies (or single dies) mounted on a die base at a certain distance. Starting from a certain stroke, all dies punch simultaneously each time, allowing for continuous processing of the workpiece. Each stroke can produce one stator and one rotor lamination. The pitch between each station of a progressive die requires high precision. Therefore, the manufacturing workload of progressive dies is substantial, the die costs are high, and the required press worktable and punching force are both large.
Progressive dies generally do not require removing the laminations from between the upper and lower dies, allowing for higher stroke rates per minute. To fully utilize their advantages, coiled strip material is necessary. Progressive dies are suitable for mass production of small motors.
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