The daily damage of copper doors is easy to repair, which can be recovered by grinding, polishing, painting and other means. However, once there is a concave phenomenon, it is very difficult to repair the copper door. So how to repair the concave copper door?

一，将凹陷修号，也是更加难得一步，有三种方法：

1、 It is also a more difficult step to repair the depression. There are three methods:

1、用真空机的负压将凹陷吸起来，这种方法只适合钣金较薄的铜门，如果钣金较厚就不适合了。

1. Use the negative pressure of the vacuum machine to suck up the depression. This method is only suitable for copper doors with thin sheet metal. If the sheet metal is thick, it is not suitable.

2、用高强磁铁吸起来，由于同门中间是空的，可以用钕铁硼强磁铁放入门的中空部位，外部用磁性较弱的铁丝引导，让强磁铁到达凹陷部位，然后外部用高强度电磁铁吸引，可以把厚度1mm左右的铜板凹陷提起来，如果厚度更高，就要用第三种方法。

2. Use a high-strength magnet to suck it up. Because the middle of the same door is empty, you can use a Nd-Fe-B strong magnet to put it in the hollow part of the door. The outside is guided by a weak magnetic iron wire to make the strong magnet reach the concave part, and then the outside is attracted by a high-strength electromagnet. You can lift up the copper plate depression with a thickness of about 1mm. If the thickness is higher, you need to use the third method.

3、在铜门凹陷处焊接多个铜枝作为着力点，用液压或者换轮组进行牵引，可将铜板凹陷提起来。

3. A plurality of copper branches are welded at the copper door depression as the force point, and the copper plate depression can be lifted by pulling with hydraulic pressure or wheel changing set.

二，同砂轮将修的凹陷打磨平整，有弧线或者棱角的位置一定要和门的整体形象统一，如果有焊接铜枝，先把铜枝打磨掉，然后再进一步打磨平整。

2、 Grind the repaired depression with the same grinding wheel. The position with arc or corner must be consistent with the overall image of the door. If there is welded copper branch, polish the copper branch first, and then further polish it.

三，作色，用制作铜门时的作色腐蚀液进行作色，确保整个铜门颜色统一。

3、 Coloring: use the coloring corrosive solution when making the copper door to ensure that the color of the whole copper door is uniform.

四，就是喷漆，用同名或者同色的铜门保护漆进行喷漆保护，到此，整个铜门凹陷的修大功告成了

4、 It's painting. The copper door protective paint with the same name or color is used for painting protection. At this point, the repair of the whole copper door depression is completed

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