In order to create an artificial environment and conditions to meet the electrical conductivity requirements, that is, when the worker operates the wire electric discharge machine to command the MOO to cut the remaining part of the workpiece, the copper piece can be adhered between the cut portion and the mother body and in the cutting gap. The handling method of the copper plug is to create artificial positioning conditions and conductive conditions, so that the spark machining can be continued. The specific practices and techniques are as follows:
1. Attach a copper piece between the cut portion and the parent material. The purpose is to ensure that the remaining part of the workpiece is fixed to the parent material during cutting, so as to ensure good positioning conditions of the wire cutting, thereby ensuring excellent processing quality of the workpiece, which can be carried out according to the following steps.
1 Firstly, according to the size of the machined workpiece, the thin copper sheet (the thickness is determined according to the condition of the wire electrode and the shape of the processing part) is cut into a strip shape, and then folded, and the well is ensured that the folded portion is long and short. The purpose of using a short copper piece is to reduce the thickness of the copper piece, so that the upper nozzle is closer to the workpiece processing part, so as to improve the processing precision;
2 Then the bent portion of the folded piece of copper is hammered with a small hand hammer and repaired into a shape as shown in Fig. 3 with a brocade;
3 The copper piece processed above is then inserted into the gap formed by the wire electrode processing, and 502 glue (ie, epoxy resin instant quick-drying glue) is dropped on the surface of the workpiece. Due to the high-pressure flushing of the wire EDM machine, the workpiece is subjected to high pressure. If the copper plate is simply plugged to ensure conduction and fixation, the following problems are easily caused: (a) the copper sheet is too loose, and it is worried about fixing. Unreliable, unstable conductive; (b) The copper sheet is too tightly packed, and it is worried about damaging the surface of the workpiece and damaging the geometrical tolerance. Therefore, 502 glue is used to ensure that the cut portion is fixed to the parent material;
4 When inserting the copper piece into the processing part, the BC section should be inserted into the gap according to Figure 4, and the AD section should be flattened to make the upper nozzle closer to the workpiece to ensure the processing accuracy. After processing, straighten it to remove the copper piece from the gap. In this case, it should be noted that when the copper piece is bonded with 502 glue, it should be far away from the remaining parts of the workpiece, so as to prevent the 502 glue from seeping into the threading hole of the guide wire just below it, causing the threading hole to be blocked. In addition, the position of the bonded copper piece should be considered symmetrically distributed, and it should be ensured that it is plugged at the same time to avoid the deviation of the workpiece, which affects the processing quality of the workpiece.
2. Filling a conductive copper sheet between the cut portion and the parent material. The thin copper sheets which are folded, cut, hammered and repaired are filled in the gap formed by the wire electrode processing, and the copper sheet and the slit wall are closely adhered. The purpose of filling the copper sheet is to conduct electricity because 502 glue is used when the front side is attached to the copper sheet, and the 502 glue is not electrically conductive. In order to achieve the conductive requirements, the method of filling the conductive copper sheet is used. When filling the conductive copper sheet, the symmetrical arrangement of the copper sheets and the copper sheets should be simultaneously tightened, and the copper sheets should not be too tight to avoid scratching the surface of the workpiece.
According to the author's experience, whether it is pasted copper or filled with a shape of a conductive copper gap. If we take Figure 5 as an example, the small copper piece should be made into a circular arc shape, and the surface of the hammered copper piece should be polished with a metallographic abrasive cloth to ensure that the surface of the copper piece is smooth to avoid scratching the workpiece. surface.
Note: In the multiple machining of the remaining part of the wire cutting workpiece, the conductive problem of the workpiece must be solved first, because in the high-precision wire cutting process, the walking route of the wire electrode may need to travel back and forth along the machining path multiple times. The workpiece is guaranteed to have high surface roughness and surface precision. At this time, the wire cutting process relies on the remaining part of the workpiece to conduct electricity to ensure normal electrical processing. However, when cutting the remaining part of the workpiece, if the remaining part of the workpiece is cut after the first cutting, the part to be cut is separated from the mother body, so that the conductive loop is interrupted and the machining cannot be continued, so the wire cutting process is performed. The conditionality and continuity considerations must ensure that the remaining parts of the workpiece maintain the normal electrical conduction requirements with the parent even in the case of multiple cuts.
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