The invention discloses a method for keeping the
line width consistency of a circuit board, which is characterized by comprising an online
control system, and the keeping method comprises the following steps: S1, obtaining the
copper thickness of each point of a
copper wire on the circuit board; s2, the liquid level of a VCP wire groove and the height of a floating plate are adjusted; s3, the
line width design value is adjusted according to the
copper thickness; s4, adjusting the
etching line speed range according to the copper thickness; s5, monitoring the copper
ion concentration in real time; and S6, determining an adjustment means according to the copper
ion concentration in the
etching process. The copper thickness on the circuit board is obtained in real time, and the liquid level of the VCP wire groove and the height of the floating plate are fed back and adjusted according to the difference between the copper thickness and the preset copper thickness, so that the copper thickness is accurately controlled, the subsequent
etching difficulty is reduced, and the consistency of the
line width of the circuit board is kept. And through an accurate dynamic compensation mode, the consistency of the finally formed line width can be maintained. According to the technical means, the stability of the forming method of the circuit on the circuit board is improved, and the CPK standard reaching rate of the circuit width of the circuit on the circuit board can be 100%.