(1) First, according to the size of the workpiece to be machined, cut the thin copper sheet (the thickness depends on the electrode wire and the shape of the machined part) into a long strip, and then fold it to ensure that the folded part is long and short. The purpose of using short copper sheet is to reduce the thickness of copper sheet and make the upper nozzle closer to the workpiece processing part, thus improving the processing accuracy. ?
(2) Then, hammer the bent part of the copper sheet flat with a small hammer and repair it with a assorted file.
(3) Plug the copper sheet treated above into the gap formed by electrode wire processing, and at the same time, drop 502 glue (that is, epoxy instant-drying glue) on this part of the surface of the workpiece. Due to the high pressure washing of WEDM during cutting, the workpiece is under great pressure. If the copper sheet is simply plugged to ensure conductivity and fixity, the following problems are easy to occur:
(a) The copper sheet is plugged too loosely, and it is worried that the fixation is unreliable and the conduction is unstable;
(b) The copper sheet is plugged too tightly, which may damage the surface of the workpiece and destroy the form and position tolerance, so 502 glue is used to ensure that the cutting part is fixed with the parent material; ?
(4) When the copper sheet is inserted into the machining part, the upper cantilever should be lowered to make the upper nozzle closer to the workpiece to ensure the machining accuracy. After the processing is completed, it is directly broken to take the copper sheet out of the gap.
It is especially important to note here that when connecting copper sheets with 502 glue, it should be far away from the rest of the workpiece, so as to avoid the penetration of 502 glue into the threading hole of the wire guide nozzle directly below it, causing the threading hole to be blocked. In addition, symmetrical distribution should be considered in the position where the copper sheets are attached, and the copper sheets should be plugged at the same time to avoid the deviation of the workpiece and affect the processing quality of the workpiece. ?
2. A conductive copper sheet is filled between the cutting part and the base material. A thin copper sheet folded, trimmed, hammered and filed is filled in the gap formed by wire electrode machining, and the copper sheet is closely attached to the gap wall. The purpose of filling this copper sheet is to conduct electricity, because 502 glue is used when connecting the copper sheet in front, and 502 glue is not conductive. In order to meet the requirements of electrical conductivity, the method of filling conductive copper sheet is adopted. When filling conductive copper sheets, we should also pay attention to the symmetrical arrangement of copper sheets, and at the same time, the copper sheets should be tightened, not too tightly, so as not to scratch the surface of the workpiece.