High Flexibility Cab Welding Line for Spot welding MAG MIG

Cab welding line

Project introduction: Heavy truck cab assembly automation welding line renovation project. Four models are on the same line, 65 units per shift, robot model: 12 units of KUKA

As one of the four major processes in the automotive industry, the welding process is self-evident. It shoulders the important mission of forming the body and providing a supporting frame for the vehicle. In addition to ensuring the appearance and shape, it must also ensure that all parts of the final assembly The precision of the component installation point, so its process is far more complicated than the other three major processes. The planning and layout of the production line not only need to consider from the aspects of precision assurance, production efficiency, distribution logistics, and storage, but are also limited by the plant area and structure, Existing conditions such as painting corridors. There is no perfect layout plan, only the most suitable layout plan at present.

Selection of main line conveying method

The main line conveying method determines the conveying time and efficiency, determines the effective working time of the station, and is the basis for the division of the process and the determination of the number of stations. The main line conveying methods are currently commonly used in three ways: reciprocating rod conveying, roller bed skid conveying, and accompanying fixture conveying. The specific choice of which method needs to be considered in combination with efficiency, cycle time and cost.

(1) Reciprocating rod conveying

Advantages: low price, reliable transportation, small footprint.

Disadvantages: The conveying efficiency is low. Generally, the conveying time of the reciprocating rod reaches 28s (including lifting, conveying, lowering, and retracting actions), and it can only be conveyed in a straight line. If there are many stations, it can only be arranged in sections, and the conveying accuracy is relatively low. Poor, it needs to be used with a positioning fixture.

Scope of application: It is generally used in production lines with low beats and a relatively small number of stations. It is not recommended to use if there are more than 10 conveying stations.

(2) Roller bed skid conveying

Advantages: moderate price, reliable transportation, high transportation efficiency (transmission time can reach about 16s), transportation is not limited by distance, can be turned at will, and flexible layout.

Disadvantages: The rotation mode and layout of the empty skid need to be considered, which will take up more layout space, the cost of the power rolling bed is high, and the conveying accuracy is poor, so it needs to be used with a positioning fixture.

Scope of application: It is suitable for production lines with high beats and a large number of stations, and is currently the most widely used in the automotive industry.

(3) Accompanying fixture conveying

Advantages: the highest conveying efficiency, high positioning accuracy, the function of the conveying mechanism and the positioning fixture are integrated, no additional positioning fixture is required, the lifting time is reduced, and the conveying time can reach 8s.

Disadvantages: The cost of a single conveying accompanying fixture is high, and the positioning accuracy of the power rolling bed is still high. The rotation method and layout of the empty skid need to be considered, which takes up a lot of layout space.

Scope of application: It is suitable for the layout of welding lines with ultra-high tempo above 50JPH.