1 Mechanical transport of electrophoresis

1.1 E-DIP rolling dip method and multi-functional shuttle method

Both the E-DIP rolling dip method and the multi-functional shuttle method can realize 360 ​​° body turning, and different angles of entering the groove and turning angle can be set according to different models, which can effectively reduce the amount of tank fluid out and the occurrence of air bubbles; according to different Different treatment processes are set to make the inner and outer paint films more uniform. However, compared with the C-hook putter method, the equipment is more complicated and the investment and maintenance costs are greater.

1.2 Fixed C-hook putter chain

The fixed C-hook putter chain is developing towards the swing bar C-hook putter chain, and at the same time, the 4-wheel putter spreader is transformed to a 3-wheel putter spreader. The angle of the slot of the fixed C-shaped hook and pushrod chain is generally fixed at 25 ° or 30 °, while the angle of the slot of the C-shaped hook and pushrod chain of the swing rod is fixed at 25 ° to 45 °. In this way, the length of the entire pretreatment electrophoresis equipment will be greatly shortened, the volume of the tank body will also be reduced, the distance of the empty spreader to the conveyor chain will be greatly shortened, and the energy load will be reduced. Compared with fixed C-hook push rod chain, compared with the swing-arm C-hook push rod chain, the pitch is significantly reduced; the 3-wheel putter spreader is significantly shorter than the 4-wheel putter spreader.

2 Application of pre-treatment electrophoresis line to remove iron powder and anti-particle technology

2.1 Application of multiple spraying methods

2.1.1 Recently, the production line hot water spray system method has changed from high pressure (10kg / m2) spray method to torrent (500mL / min) spray method. Practice has proved that most of the gray debris in the welding point of welding white body is at the bottom of the body After this improvement, the cleaning effect is significantly improved.

2.1.2 The spray after phosphating has changed from the ordinary spray method to the high pressure (10kg / m2) or medium pressure (5kg / m2) + medium flow (50mL / min) spray method. Practice has proved that the conversion can be more effective Remove phosphating slag attached to the body surface.

2.2 Application of magnetic rod

Since the welding slag has the greatest effect on the appearance of particles on the surface of the coated product, removing the welding slag is one of the focuses of the pre-painting electrophoresis work. Not only a large flow or high and medium pressure spray system, but also iron removal powder Special equipment (especially the hot water washing tank and degreasing tank), a large number of magnetic rods can be placed in the auxiliary tank of the bath to remove iron powder in the bath and reduce secondary pollution caused by it.

2.3 Development of surface flow and circulation mode

2.3.1 The control of the surface flow of the phosphating tank is very important. It can prevent the adhesion of phosphating sediment on the surface of the vehicle body and can make the phosphate film uniform. At present, the surface is provided with a surface flow to the entire tank. Flow direction.

2.3.2 The cycle of the electrophoresis tank has been changed from circulating in a direction parallel to the vehicle body to circulating in the convection direction with the vehicle body. Practice has shown that this type of transformation can significantly reduce the number of paint film particles.

3 Electrophoresis secondary flow mark pretreatment technology

The disadvantage of the coating film of the electrophoretic secondary flow mark of the workpiece is not only that it requires manual polishing treatment, but also brings a particle source (grinding dust) again. For this reason, many companies take preventive measures for the problem of secondary electrophoretic flow marks, such as adding air showers before the workpiece enters the baking oven, and relying on wind to blow out the residual liquid in the gap. At present, more implementation methods include: fresh ultrafiltration spray in electrophoresis tank, pure water spray at 30 ～ 50 ℃, additional hump draining section and preheated air shower at 100 ℃ × (3 ～ 5) min. Effectively remove the electrophoresis solution remaining in the weld, and reduce the occurrence of secondary flow mark failure points.