In the mixed production line the electrodeposition method

摘要

PURPOSE:To surely form an electrodeposition coating film appropriate for the materials of various size and kinds to be coated by indexing the electrodeposition coating film thickness after the software is started for each material and adjusting a voltage to draw a locus fulfilling the integral of a voltage-time curve capable of obtaining the thickness. CONSTITUTION:A specified low voltage is impressed on a low-voltage bar 4 to initially energize each automobile body W submerged in an electrodeposition tank 3, and a high voltage is impressed on the body W transferred from the bar 4. The thickness n1 of a coating film to be formed from the start to finish of the software is indexed for each body W based on the preset thickness N of the coating film. The integral value of the voltage-time curve capable of obtaining the thickness n1 is obtained. The voltage is adjusted so that the voltage-time curve at the start of the software draws the locuses a-c fulfilling the integral value obtained for each body W. As a result, the existing equipment is used as such without specially remodeling the feeder bar and the electrode in the tank, and an electrodeposition coating film appropriate for the material of various size and kinds is formed.