What do we need to know about the operation of CNC machining?
In the CNC machining industry, will we encounter some technical problems that are not professional enough? It doesn't matter, I will give you an experience talk through CNC processing factory technology, for reference only!
1. The speed of the white steel knife should not be too fast;
2. Or alloy knife;
3. When the workpiece is too high, it should be thickened with different lengths of knives in layers;
4. After roughing with a large knife, use a small knife to remove the remaining material to ensure that the remaining amount is consistent before smoothing the knife;
5. The plane should be processed with a flat-bottomed knife, and the ball knife should be used less to reduce the processing time;
6. Then determine the size of the ball knife;
7. The four corners of the calibration plane should be flat;
8. Where the inclination is an integer, use the inclination tool for processing, such as pipe position;
9. Before doing each process, think clearly about the previous one The remaining allowance after the process is processed to avoid empty tools or excessive machining;
10. Try to take simple tool paths, such as shape, Digging grooves, single side, less walking around the same height;
11. When walking WCUT, if you can take FINISH, don't take ROUGH;
12. When the profile light knife is used, first rough light, then fine light, when the workpiece is too high, first light edge, then light bottom;
13. Set tolerances reasonably to balance machining accuracy and computer calculation time. When roughing, the tolerance is set to 1/5 of the allowance, and when the knife is smooth, the tolerance is set to 0.01; time. Do a little more thinking and reduce the chance of mistakes. Do more auxiliary lines and auxiliary surfaces to improve processing conditions;
15. Establish a sense of responsibility, carefully check each parameter, and avoid rework;
16. Diligent in learning, good at thinking and continuous improvement. For non-planar milling, use more ball cutters, less end cutters, and don’t be afraid to pick up the cutter; clean the corners with small knives, and finish with big knives; don’t be afraid of surface repair, proper surface repair can improve the processing speed and beautify the processing effect;
17. High hardness of blank material: better for up milling
Low hardness of blank material: better for climb milling
The machine tool has good precision, good rigidity and finishing : It is more suitable for down milling, on the contrary, it is more suitable for up milling.
It is strongly recommended to use down milling for finishing the inner corner of the part.
Roughing: Up milling is better; Finishing: Climbing milling is better
The tool material has good toughness and low hardness: more suitable for roughing (large cutting amount machining)
The tool material has poor toughness and high hardness: it is more suitable for finishing (small cutting amount machining).
18. The problem of thickening the front mold:
First, rotate the copper male drawing 180o in the front view or side view to change It has become the front mold drawing, of course, the pillow position and PL surface must be added; where the original body needs to be left in the front mold, do not use the mirror body method to change the copper work drawing into the front mold drawing, sometimes it will be wrong (when the copper public drawing When the X and Y directions are not symmetrical).
There are two difficulties in the processing of the front mold: the material is relatively hard; the front mold cannot be easily welded, and it cannot be wrong.
The principle of using a knife when roughing the front mold is similar to that of the copper worker. The big knife is roughing → the small knife is rough → the large knife is smooth → the small knife is smooth, but the front mold should try to use a large knife, do not use a knife that is too small, it is easy to For the punching knife, the knife handle () is usually used to open the rough first, and the round nose knife is also used as much as possible for the smooth knife. Because this kind of knife is large enough, powerful, and has a parting surface, it usually encounters a problem when machining the front mold. When the light knife is used, the parting surface needs to be accurate because it touches the machine, and the cavity needs to leave a machining allowance of 0.2~0.5 (leave it for sparks). This is to correct the surface of the mold cavity by 0.2~0.5 in the positive direction, and set the machining allowance to 0 when writing the tool path.
It is usually necessary to limit the cutting range when the front die is roughed or polished. Remember that the range you set is the range of the tool center, not the range of the tool boundary, not the range processed by the tool. One larger tool radius.
The commonly used tool path method for front die roughing is surface grooving and parallel smooth knife. When the front mold is processed, the parting surface and the pillow surface are generally processed to the right number, and the penetrating surface can be left with a margin of 0.1 to prepare for the mold.
