Nx hole machining simulation cycle and its applica

2022-06-17
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Nx hole processing simulation cycle and application

it can process various types of holes on CNC machine tools (milling machines or machining centers), such as center holes, through holes, blind holes, counterbores, deep holes, etc. its processing methods can be spot facer, drilling, reaming, boring, tapping, etc. No matter which method is used to process which kind of hole, the NC program usually calls the fixed cycle instruction code g73~g89 on the NC machine tool. The so-called fixed cycle refers to the machining process in which the tool first moves quickly to a specified machining position, then processes to the specified depth at the cutting feed speed, and finally returns at the tool withdrawal speed

nx/manufacturing automatic programming module not only provides a variety of fixed hole processing cycles such as standard drilling and boring, but also provides two simulation cycles: peck drill and break chip drill. The so-called simulation cycle refers to a special cycle that does not use the fixed cycle instructions g73~g89, but simulates the fixed cycle movement of hole machining to realize hole machining. This paper will discuss the two simulation cycles of pecking drill and chip breaking drill, analyze their tool path and NC program after post-processing, and compare them with similar fixed cycles to explain their characteristics and usage

1. simulation cycle

1). The drill pecking simulation cycle

generates a drill pecking simulation cycle at each hole processing position. Figure 1 is the schematic diagram of the drill pecking cycle principle. The specific processing process is as follows: ① the tool fast forward to point a determined by the Min clearance; ② Cutting feed to point d (continue to feed a cutting depth increment after passing through the start point B of the machined hole); ③ Quickly retreat to point a (retreat the tool to the outside of the hole to facilitate chip removal and the entry of cutting fluid); ④ Fast forward to point C (the previous cutting depth is offset by a step safety distance along the tool axis); ⑤ Cutting feed to point F (the cutting depth is a step distance and a cutting depth increment). Repeat steps ③ ~ ⑤ until the machining reaches the specified cutting depth

by analyzing the cycle process of pecking drill, it can be seen that this cycle mode is similar to the fixed cycle g83, which is suitable for deep hole processing. However, when the increment of cutting depth is none, the cycle process of pecking drill will be simplified, which is similar to the fixed cycle g81, and can be used for general hole processing

Figure 1 Schematic diagram of pecking drill simulation cycle

2). Chip breaking drill simulation cycle

generates a chip breaking drill simulation cycle at each hole machining position. The chip breaking drill cycle is similar to the pecking drill cycle. The difference is that after each increment of cutting depth is fed, that is, after the tool reaches point D or F as shown in Figure 1, the tool does not return to point a determined by the minimum safety distance outside the hole, but to the position determined by the current position offset by a step safety distance along the axis of the tool, such as point C or point E as shown in Figure 1. During tool withdrawal, because the tool does not cut and rotates at a high speed, the chip wound on the tool can be broken to achieve the purpose of chip breaking

according to the analysis of the cycle process of the chip breaking drill, it is similar to the fixed cycle G73, which is suitable for the hole processing of ductile materials. However, when the cutting depth increment is none, it is similar to the fixed cycle g81, which can be used for the processing of general holes

2. simulation cycle tool path analysis

due to space limitations, only a section of pecking cycle tool path is excerpted below. In this path, there is only goto statement. In fact, in any complete circular tool path of pecking drill or chip breaking drill, there is only goto statement and no cycle statement. It can be seen that the tool path of the simulation loop does not use the fixed loop statement

several major standards of Jinan assay electronic tensile testing machine fedrat/800.0000

goto/72.0517,35.6093,45.0000

paint/color, 31

fedrat/250.0000

goto/72.0517,35.6093,35.0000

paint/color, 37

fedrat/600.0000

goto/72.0517,35.6093,53.0000

after postprocessing the tool path of the pecking drill or chip breaking drill simulation cycle, all goto statements are converted to G00 and G01, That is, in PTP (NC) program, only G00 and G01 are used to control the tool to realize the circular motion of hole machining. Since G00 and G01 have the same format in the control system of general machine tools. Therefore, the hole machining program written by the simulation cycle and the fixture in the machine tool control system 7. The fixture for universal tensile testing machine has no fixed mode in structure, and the structure varies greatly according to different samples and experimental forces; Cycle independent, i.e. independent of the type of CNC machine tool. Therefore, the NC program written by using the simulation cycle can generally be applied to any NC machine tool. At the same time, it is worth noting that the NC program generated by the simulation cycle is long, especially when the hole depth is deep and the cutting depth increment is small, the NC program generated is longer. However, due to the high data processing speed of today's computers, even if the program is very long, it will not affect its execution and processing efficiency

3. conclusion

① by using two simulation cycles, it is not only possible to compile the hole processing program for deep holes or hard to add materials such as ductile materials. 1. The program is within the range of 10 ℃ (3) 5 ℃ at room temperature

② if the increment of cutting depth is set to zero, the NC program for general hole machining can also be written by using the simulation cycle mode

③ when using simulation cycle to write NC program, it is not necessary to consider or be familiar with the fixed cycle instructions of the machine tool, and the program is universal and can be applied to many types of NC machine tools (milling machines or machining centers)

④ simulation loop is an automatic program, which can improve programming efficiency and high code quality. (end)

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