The white body, as the cornerstone of automotive structure, is composed of multiple metal structural components welded together to provide the strength and rigidity for the entire vehicle structure. With the increasing demand for lightweighting in new energy vehicles, the application of integrated aluminum castings in welding workshops is growing, which in turn increases the demand for bolt connections. The quality of these connections is critical, directly affecting the overall quality and safety of the vehicle.

Bolt connections in white body assembly involve more than 10 assembly stations in the floor assembly, side assembly, engine compartment assembly, and four doors and two covers. These connections primarily use large-diameter flat washers or flange bolts with specifications such as M6, M8, and M10. Compared to regular screws, the automation of feeding these large screws is more challenging. At the same time, there is a need to pursue high production beats and stable quality to meet the high automation and flexibility requirements of the welding workshop. Therefore, having a stable and reliable automatic screw feeding system is particularly important.

Danikor's newly developed 2L step screw feeder, with its optimized structural system, significantly reduces the risk of screw jamming. The standard screw jamming rate has been lowered to as low as 50 PPM, further ensuring high-quality and efficient production on automated lines. The feeder is compatible with a wide range of screw sizes (M3 to M10), covering most of the screws needed for white body assembly. For larger screws, a 4L stepwise screw feeder can be used, covering screw sizes from M4 to M14, ensuring stable feeding.

It is worth noting that screws with a low length-to-diameter ratio have certain limitations when it comes to automatic blow feeding. They are prone to flipping inside the blow tube, leading to jamming and cross-threading. Drawing on extensive on-site experience, Danikor provides corresponding automated screw feeding solutions for the challenges posed by screws of different length-to-diameter ratios.

1. Screws with a very low LDR, unsuitable for blow feeding

   Solution: Extend the vibration track of the screw feeder. For screws with a low LDR that are not suitable for blow feeding, the vibration track of the screw feeder can be extended to orderly convey the screws to the pick-up position. Once one screw is picked up, the next one is immediately ready, saving on the screw feeding cycle. However, since the vibration mechanism is connected to the feeder body, the flexibility of the on-site workstation layout is somewhat limited.

1. Screws with a length-to-diameter ratio suitable for blow feeding

   Solution: Direct blow feeding from the screw feeder.

• Blow to a receiving platform for pick-up: This method involves a simple and stable receiver structure that is small in size and can flexibly adapt to on-site layouts. The blow tube position is fixed, significantly reducing the risk of screw feeding jams. For hexagonal screws, a stop rotation receiver can be used to encase the nozzle, ensuring efficient pick-up.

• Direct blow feeding to the nozzle: This method, which is mature and stable in performance, is suitable for high production beat demands. However, it also requires careful layout of the feeding tube.

The feeding tube, as a key component for screw feeding, is manufactured with strict control over its inner diameter tolerance and roundness by Danikor. It is wear-resistant and flexible, capable of supporting the long-distance conveyance of large-diameter screws and adapting flexibly to on-site workstation layouts.

When using blow feeding, the screw feeding systems on both sides of the vehicle body can serve as backups for each other. For example, if one side's screw feeder fails, the other side's feeder can blow screws through a distributor, avoiding production halts due to material shortages and maintaining production schedules.