There are two short principles for manual programming: (1) The part processing route should be as short as possible. (2) The part processing procedure should be as short as possible. This mainly includes two aspects: the reasonable selection of the cutting amount and the selection of the program's hollow path. After the programming principle is determined, what is determined according to the shape of the blank and the size of the machining allowance. Sample processing instructions. In general, the blank material and the machining allowance are large with a cycle command—a single fixed cycle or multiple compound cycles.
Flexible application of machining instructions CNC machining machines have interpolation functions and simplified programming functions. Sometimes the interpolation function is no more complicated than simplifying the programming function. For example, for parts that have been roughed, the machining allowance is small. The compensating function greatly simplifies programming, and the production efficiency is high due to the short processing route.
For parts with large machining allowances, use cyclic programming commands—fixed cycles or multiple cycles. For a simple shape, a fixed cycle is generally used, and for a complex shape, a multiple cycle instruction is used. Specifically, the bar or inner hole blank is commanded by the G71 and G70 roughing cycles and the finishing cycle, and the G73 and G70 roughing cycles are used for the forgings, casting parisons and concave surfaces with large machining allowances.
In addition to paying attention to the difference between the interpolation function and the application of the cycle instruction, it is also necessary to pay attention to the difference between different machining instructions and cutting methods. For example, the thread is machined with G32 and G76 commands, the G32 machining is straight-forward, and the G76 is diagonal.
The G32 programming depth of cut is generally a constant value, double-edged cutting, and each depth of cut is generally programmed by the programmer. The G76 programming depth of cut is decremented, and the cutting is single-edge cutting. The cutting depth is controlled by the control system. To calculate the given. Know the difference in the way you cut in, you can use it as you like. Generally speaking, G32 is mostly used for small pitch thread machining, G76 is suitable for large pitch thread machining. This method is more convenient when the thread precision is not high. When machining high precision, it can be completed by two CNC machining knives. First use the G76 processing method to rough the car, and then use the G32 processing method to finish the car.
In summary, the preparation of the machining program requires the programmer to have the process knowledge related to the machining process, familiar with the programming instructions and instruction formats, the instruction code and the system functions of the CNC machine used, and also pay attention to the processing methods of different machining instructions. The difference is that it can be used to create a correct and practical machining program.
The procedures for checking and commissioning the program must be checked before being officially used for production and processing. The inspection of the program can be realized by the empty operation, that is, the machine lock, the auxiliary function lock, the dry run, and whether the running track of the tool is consistent with the programming through the simulation drawing. Modify and adjust the program according to the inspection results. Check the changes, check and then modify. This often has to be repeated many times until a program that fully satisfies the processing requirements is obtained. In addition, the point to be reminded is that after the operation is finished, it is necessary to mechanically return to zero to determine the workpiece coordinate system.
The various tasks in the above programming steps are mainly done manually. Such a programming method is called "manual programming". In various mechanical manufacturing, a large number of geometric elements such as straight lines and arcs are not complicated. Parts need to be machined.
(Finish)
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