7.1.1 Describe the principles of robot application process

7.1.1 Describe the principles of robot application process 

b. Spraying process

•      Paint Spraying 

•      In general, paint-spraying applications require limited automation technology. 

•      The number of sensors required is relatively low, the support equipment is primarily material handling, and robot precision is not critical. 

•      Servo paint-spraying robots have traditionally cost more than the standard servo robot, but the cost of the work cell is about the same because the support hardware is less.

•       Several applications are supported by robotics: part is lowered into the coating material reservoir and removed to allow excess material to flow off the part. In some cases parts are spun to remove excess coating material

FIGURE: DIP COATING

 

             • Dip coating: The. A variety of robots are used in this application area, including servo- and nonservo-type arms. 

FIGURE: PAINT SPRAYING AIRLESS

             • Paint spraying—airless: The coating material is pushed through a small nozzle opening by a pump in the spray head to atomize the material. The residual momentum from the atomizing process causes the material to coat the part. Servo arms are required when robots are used, and continuous-path control of the spray gun is necessary. 

      • Paint spraying—compressed air: The atomizing action in this system is caused by compressed air passing over a venturi. The residual momentum of the paint and air mixture carries the material to the target. Again, servo-type controllers with continuous-path control are necessary. 

FIGURE: ELECTROSTATIC

     • Paint spraying—electrostatic: Paint is given an electrostatic charge as it passes through the spray head, and the part is connected to a voltage source with the opposite polarity. The paint is pulled to the part by the difference in the electrical charge between the paint droplets and the part. Continuous-path servo machines are used for robot applications in this area.

•      Concerns for the health of workers and gains from productivity force manufacturers to use robots for all large painting applications. 

•      Automotive and truck manufacturers rarely use a human in a production paint area. 

•      A primary advantage of the robot in painting is the repeatability of the programmed motion. 

•      If a master painter is used to record the motion of the paint program, then every robot becomes a master painter.

FIGURE: MASTER PAINTER PROGRAMMING

•       Heavy use of painting robots occurs in the automotive and aerospace industries, and moderate use occurs in heavy-equipment industries.

 

VIDEO: HIGH FINISHING COATING BY  ROBOT!!!