Tips in CNC machining of metal parts

2023-07-24

Tips in CNC Machining of metal parts F19a8773

1. Problems in loose copper processing

Sometimes the overall copper male processing is difficult, there is a dead angle that cannot be processed, or it is not good to process, the required tool is too long or too small, you can consider dividing one more copper male, sometimes the local need to clear the corner copper male, the processing of this copper male is not difficult, but must be clear about the deviation of the good spark, the calibration benchmark.
2. Add T to the copper male of the thin disc position
This kind of copper male processing is easy to change, processing to use a new knife, the knife to be smaller, the feed can not be too large, processing can first make the length a accurate, but d leave a large margin (such as 1.0mm) and then go on two sides, each depth h = 0.2 ~ 1, the depth of the knife is not too much, do not go around the knife in a week, but to divide into two sides separately.
3. Left, right pieces and the direction of one out of two
Sometimes a set of molds will produce two parts, and for the left and right parts, the pattern can be made through the mirror. If it is two identical parts, the figure must be symmetrical or rotated in XY, must not be mirrored, and must be careful not to engage in the opposite direction.
4. The orientation of the mold
The four guide holes of the mold base are not completely symmetrical, one is asymmetrical, so when processing the front and rear molds, it is clear that there is a reference on each template, and the processed before and after the mold must be benchmarked to the benchmark, especially for the mold formed by the original mold embryo must be noted. When drawing, also pay attention to the direction, the direction of the copper male is the same as the direction of the front view (top view), the direction of the core and the Tibetan frame is the same as the copper gong, and the front model is the opposite. Some decorative lines such as grooves or bosses on curved surfaces are difficult to process because they are relatively narrow. For grooves, we generally avoid the groove, that is, mill deeper, and then make a loose male to make a sinking surface, the boss can generally only be separated to do a loose male, the large copper male does not do, so as to ensure the quality.
5. Mould, product matching tolerance
A set of products usually has several or a dozen parts, the main matching size of these parts are guaranteed by computer gong processing, it is very important to choose a reasonable tolerance, especially some product design drawings do not consider the problem of fit. BOTTOM, THE FIT OF THE SHELL, THE SHAPE IS UNDOUBTEDLY 0 TO 0 MATCH, THE POSITIONING IS GUARANTEED BY THE BRANCH, THE TOLERANCE OF THE CONCAVE SUPPORT AND THE CONVEX SUPPORT IS GENERALLY 0.1MM, UNILATERAL. The accessories on the large body such as transparent mirrors, the general shape of the accessories is smaller than the size of the large body unilateral 0.1 ~ 0.2. The active accessories on the large body, such as buttons, the shape of the accessories is 0.1 ~ 0.5 smaller than the shape of the large body than the single side. The surface shape of the accessories on the large body should generally be consistent with the surface shape of the large body, and it can be derived from the surface of the large body.
6. Mold slope (draft angle)
Plastic mold to make mold inclination, otherwise will rub flowers, if the drawing is not indicated, you can discuss with the mold master, mold slope is generally 0.5 ~ 3 degrees if the mold of the etching, the mold angle should be made larger, 2 ~ 5 degrees, depending on the thickness of the erosion.

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