CNC machining ten points
1, processing order should be arranged according to what principle?
The arrangement of processing order should be based on the structure of parts and blank condition, as well as the need to consider the positioning clamping, the key is that the rigidity of the workpiece is not destroyed.Order generally should be carried out according to the following principles: (1) the process of the last process cannot affect the next process of positioning and clamping, interlaced with general machine tool processing process also want to consider. (2) advanced line shape cavity processing sequence, after the shape processing process. (3) with the same positioning, clamping way or the same knife processing process is best connected. (4) in the same installation of multiple processes, should first arrange the workpiece rigid damage small process.
2. Process division method?
(1) tool centralized sorting method: according to the tool division process, with the same tool processing parts on all parts can be completed.Use the second knife and the third knife to do what they can do. (2) to process the parts of the order method: for the processing of a lot of parts, according to its structural characteristics of the processing part is divided into several parts, such as shape, shape, surface or plane. (3) to rough, fine processing sub-order method: for easy to produce processing deformation parts, due to rough processing may occur after the deformation and need to be calibrated, so generally speaking, where to carry out rough, fine processing will be separated from the process.
3. the workpiece clamping way determination should pay attention to which several aspects?
In determining the positioning of the benchmark and clamping scheme should pay attention to the following points: (2) try to reduce the number of clamping, as far as possible in a positioning can be processed after all the surface to be processed. (3) to avoid the use of machine manual adjustment program. (4) fixture to open, its positioning, clamping mechanism can not affect the processing of the knife (such as collision), in such cases, can be used with vise or add the bottom of the way to remove the screw clamping.
4. how to determine the reasonable knife point?
The knife point can be processed in parts, but pay attention to the knife point must be the benchmark or already processed parts, the first step in the attention to the knife to have relatively fixed size relations with the locating datum places set up a location relative to the knife, so that we can according to the relative position between them relations back to the original cutting point.This position is usually located on a machine tool table or fixture.The selection principle is as follows: (1) find is easy. (2) convenient programming. The knife error is small. (3) when the processing inspection is convenient.
5. how to choose a reasonable processing tool?
When face milling, the end milling cutter or end milling cutter should be selected. The end milling cutters of the end milling cutters and insert carbide blades are mainly used for machining the convex head, groove and box mouth surface.Ball knives and round knives ( also known as round nose knives） are often used for machining curved surfaces and bevel contour shapes. And the ball knife is used for semi - finishing and finishing. Circular cutters with carbide inserts are usually used for roughing.
6. What is the function of the processing procedure sheet?
Processing program is one of the contents of numerical control machining process design, but also need the operator to comply with, the implementation of the procedures, is the specific description of the processing process, the purpose is to let the operator clear program content, clamping and positioning method, the selection of the tool processing process should pay attention to the problem.
7. What is the relationship between the workpiece coordinate system and the programming coordinate system?
The origin position of the workpiece coordinate system is set by the operator himself, it is determined after the workpiece clamping, through the knife, it reflects the distance between the workpiece and the zero position of the machine tool. Once the workpiece coordinate system is fixed, it is generally not changed. Both workpiece coordinate system and programming coordinate system must be unified, that is, workpiece coordinate system and programming coordinate system are consistent during processing.
8. What factors should be considered in determining the cutting route?
Guarantee the processing accuracy of parts. (1) convenient numerical calculation, reduce the programming workload. (2) to seek the shortest processing route, reduce the empty knife time to improve the processing efficiency. (3) try to reduce the number of procedures. (4) to ensure the roughness of the workpiece contour surface processing requirements, the final contour should be arranged for the last piece of continuous processing out.6. The advance and retreat of the knife (cut and cut) line should also be carefully considered, in order to minimize the outline of the knife and leave a knife mark.
9. the cutting tool cutting parameters have several major factors?
Cutting parameters have three elements: cutting depth, spindle speed and feed speed.The general principle of cutting parameters selection is: less cutting, fast feed (that is, small cutting depth, fast feed speed).
10.What is DNC communication?
Program delivery methods can be divided into CNC and DNC two, CNC refers to the program through the media (such as floppy disk, tape reader, communication lines, etc.) to the storage of the machine tool storage storage, processing from the storage program to process. Because the memory capacity is limited by the size, so when the program is large, DNC processing can be used, because the DNC processing machine tool directly from the control computer to read the program (that is, while doing), so not by the memory capacity is limited by the size.
