How to Feed and Position Nuts for Projection Welding

In the automotive and sheet metal industries, the application of nut projection welding is very widespread. However, this brings up an important question: how to feed and position the nuts. The feeding method directly affects delivery efficiency and work rhythm, while the positioning method relates to the precision and quality of the welding. This article will explain the feeding and positioning of nuts in projection welding to help you better understand the principles involved.

Feeding Methods

Nuts can be fed in two main ways: manual feeding and automatic feeding.

1. Manual Feeding

Manual feeding does not require additional equipment, but it comes with certain quality risks, such as the possibility of picking the wrong material and the risk of operators injuring their hands. Additionally, the working time for manual feeding cannot be accurately calculated, and compared to automatic feeding, it is generally slower.

2. Automatic Feeding

Automatic feeding is usually paired with a nut conveyor on a орех место welding machine. During welding, the nuts are automatically sent to the welding position. Automatic feeding is gradually becoming mainstream, and its advantages are clear:

• No risk of picking the wrong material
• No risk of hand injuries
• High delivery efficiency, improving production efficiency
• Can be integrated with welding machines and robots for automated welding

Types of Automatic Feeding

Many people know that nuts can be automatically sent to the welding position, but they may not understand how it works. Here are several types of automatic feeding methods and their explanations:

1. Vibratory Bowl Feeding

This method uses vibrations to sort, arrange, and flip the nuts to distinguish between the front and back sides effectively. A feeder sends the nuts to the delivery gun, which then accurately delivers them to the positioning pin to complete the task.

2. Electric Bowl Feeding

Electric bowl feeding uses a motor-driven mechanism to rotate and sort the nuts. The sorted nuts are then sent out by a feeder and delivered to the positioning pin by the delivery gun.

3. Pusher Bowl Feeding

In this method, a push plate repeatedly pushes the nuts out in parallel for sorting and arrangement. The sorted nuts are then sent out by a feeder and delivered to the positioning pin by the delivery gun.

These three methods use mechanisms for orderly arrangement and delivery. They have the advantage of being low-cost and easy to produce, but the downside is that they require custom delivery bowls and guns, making simple switching difficult.

4. Random Feeding

Random feeding uses a flexible vibratory bowl to vibrate the nuts. A CCD camera above identifies the shape and coordinates of the nuts. A robot then grabs the nuts based on the identified coordinates and places them onto the positioning pin. This method can accommodate various nut shapes and has the advantage of not requiring custom delivery bowls and guns. However, it is more expensive and has slightly lower delivery efficiency.

These automatic feeding methods are applied differently in various scenarios but can all work with robots to achieve automated projection welding.

Positioning for Nut Projection Welding

The positioning for nut projection welding typically uses the bottom hole of the plate as a reference. This ensures concentricity after welding without needing to constrain the entire workpiece. The positioning method often uses pin shapes, including pointed pins and round pins.

• Round Pins: Suitable for manual placement, with a shorter front end to reduce compression space.
• Pointed Pins: Suitable for automatic feeding, with a longer front end that is better for nuts delivered quickly by the delivery gun. Pointed pins can be customized with different steps based on the product to fit the nut’s threads and stepped holes. Additionally, different step diameters and tapers can seal holes in the plate and nuts, effectively preventing welding slag from entering the threaded holes.

Material Selection for Positioning Pins

Positioning pins for projection welding need to provide accurate positioning while also being insulated from the nuts and the workpieces. Common materials include ceramics and KCF. Traditional ceramic pins are fragile, leading to high replacement rates. New ceramics, such as zirconia and silicon nitride, maintain the hardness and insulation of ceramics while being more durable and less likely to break. Therefore, they are increasingly favored in various applications.

Заключение

The feeding and positioning methods for nut projection welding are crucial for improving production efficiency and welding quality. As automation technology develops, automatic feeding will become the main direction of the industry, and proper positioning methods will further enhance welding precision and effectiveness. We hope this article provides valuable insights into the feeding and positioning of nuts for projection welding. If you would like to learn more or want to purchase equipment, please contact the Agera team at gracemou@anjiazdh.com.