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Different coil feeding way comparison: Servo Feeding, Pneumatic Feeding, Mechanical Feeding

Different coil feeding way comparison: Servo Feeding, Pneumatic Feeding, Mechanical Feeding
Update Time:2019-11-13
Servo Feeding

Although servo feeders may be a bit expensive equipment, they are also very versatile equipment for a wide range of material thicknesses and widths. Servo feeders can be programmed separately for different stamping dies, so the changeover reduces many settings times. 

The servo feed speed is also relatively fast. Of course, the speed is related to the feeding length: the longer the feeding length, the longer the feeding time, which will affect the speed of the stamping process. Even so, the servo feeder does the job well in most of the press feeding.

With a servo feeder, you can set many parameters in one stamping cycle. For example, if you are performing in-mold tapping and the strip can only move within 90 degrees of the press cycle, you can program on the servo feed. It will affect the speed of operation to a certain extent, because you have to complete the feeding in a short time, but again if you can use the other 220 degrees of the stamping cycle, you have more time to feed and can run Faster.

Another outstanding feature is the ability to fine-tune small numerical feeding length while producing tiny, precise pieces. The fourth advantage is that it can be feed in a Z shape, the strip can be moved not only from left to right but also from front to back. The zigzag type servo feeder saves up to 13% of raw materials. 

The most significant benefit of servo feeder is its ability to sense material feeding resistance. If your stamping die is running, a scrap ejected, or if you have a tap in the mold, a tap breaks, or a punch breaks and gets stuck in the strip and dies. The servo feeder will detect that, stop running and pull back to the previous step.

Pneumatic Feeding

Pneumatic feeding is a reliable, very cost-effective option. Suitable material thicknesses range from 0.1 mm to 2.0 mm thick and from 10 mm to 200 mm wide. They are not as precise as servo or mechanical feeders, but the stamping die guide pins are usually sufficient to compensate for slight variations in feed length.

The biggest problem with air feeder is the time setting problem. Because It is air driven, it has an inherent hysteresis. When you increase the punching speed, you must set the feed signal in advance. In high-speed mold production, it is usually necessary to establish the feed signal before the bottom dead center of the stroke, when the punch is still in the raw material. The feed took a stamping cycle of approximately 270 degrees. Setting the feed parameters is like an art, and strapping at low speeds is also challenging.

Mechanical Feeding

Mechanical feeders are suitable for high quality, high-speed press feed. In the experience, they are by far the fastest and most accurate feeding device. Under the right conditions, the mechanical feeder can run above 2000SPM. But their shortcomings are also apparent. The installation is complicated, not suitable for multiple-step feeding.

The selection of the feeding line depends on the specific production situation. Please contact HongEr experts to help you find the most suitable coil feeding solution.