With the increasing requirements of the automobile manufacturing industry for indicators such as welding accuracy and speed, and the increasing personalization needs of users, in order to meet the market demand of multiple models and multiple batches, the flexibility and flexibility of the production capacity of the body shop can be improved. Industrial robots have been widely used in body welding. This paper introduces the application of spot welding robot and arc welding robot system in body welding with examples.
The structure and craft of the car body largely determine the safety factor of the ride. The body body is a complex thin plate structural member made up of more than a dozen large assemblies and hundreds of thin plate stamping parts, which are connected by spot welding, arc welding, laser welding, brazing, riveting, mechanical connection and bonding. Due to the many parts involved in the body-in-white, complicated processes and various types of equipment, the body planning has high requirements for welding processes, welding fixtures , quality control and maintenance. This paper focuses on the application of spot welding robot system and arc welding robot system in body welding.
[Spot welding robot system]
The quality of the body spot welding directly affects the strength and safety of the car body. Spot welding equipment is the most widely used in the production of automobile bodies due to its ease of mechanization, low cost, mature technology and complete supporting facilities. Nowadays, the complete automation of the spot welding process has become a trend. The robot spot welding system has been widely used and is gradually replacing manual spot welding.
1. Pneumatic spot welding robot system
The pneumatic spot welding robot system includes a robot body, a robot controller , a spot welding controller, an automatic electrode dressing machine, a pneumatic spot welding tong and a water gas control unit for water and gas supply, as shown in FIG. 1 .
Figure 1 Pneumatic spot welding robot system
As the actuator of the spot welding robot, the pneumatic welding tongs generally adopts the integrated welding tongs, that is, the welding transformer is installed behind the welding tongs, which reduces the loss of the secondary cable and improves the welding quality. Due to the use of integrated welding tongs, the transformer must be miniaturized to increase the payload of the robot. For the transformer with large capacity, the intermediate frequency inverter technology has been adopted: the 50Hz power frequency AC is changed to 600~1000Hz AC and rectified, so that the volume of the transformer is reduced and reduced.
The electrode assembly of the pneumatic welding tongs is basically similar to the manual welding welding tongs, and the contact with the workpiece and the electric welding are completed. In order to reduce the cost of maintenance and modification, the welding tongs assembly has a modular tendency. The spot welding robot has stable and reliable action and high repeatability, which can replace the heavy physical labor of people, improve the welding quality and improve the flexibility of the production line.
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