9 Points For Determining Threading Hole In WEDM Machining

1. It is better to select the position of threading hole for WEDM machining at the intersection of known track size or on the coordinate point convenient for calculation, so as to simplify the calculation of coordinate size in programming and reduce errors.

2. When cutting a female die workpiece with a closed hole, the threading hole should be set in the center of the hole, which can not only accurately process the threading hole, but also conveniently control the calculation of coordinate trajectory, but the useless cutting stroke is long.

3. For large shaped hole cutting, the threading hole can be set at the corner near the machining path to shorten the useless stroke.

4. When cutting the punch shape, the threading hole should be selected outside the profile, preferably located near the starting point of cutting.

5. When cutting a narrow groove, the threading hole shall be set at the widest part of the figure, and no intersection between the threading hole and the cutting track is allowed.

6. In addition, when more than two workpieces are cut on the same blank, independent threading holes shall be set. It is not allowed to set only one threading hole to cut all workpieces at one time.

7. When cutting large punch, if possible, several threading holes can be set along the machining path, so that when wire breakage occurs during cutting, the wire can be re threaded nearby to continue cutting.

8. The diameter of threading hole shall be appropriate, generally Φ 2mm～ Φ 8mm。 If the hole diameter is too small, it will not only increase the difficulty of drilling, but also make threading inconvenient; If the hole diameter is too large, the workload of fitter will be increased.

9. If the number of shaped holes required to be processed by wire cutting is large, the hole diameter is too small, and the arrangement is dense, smaller threading holes shall be used（ Φ 0.3mm～ Φ 0.5mm), so as to avoid each threading hole being opened to each other.