In numerical control machine tool (milling machine or machining center) go up the aperture that can process a variety of types, wait like aperture of central aperture, via, blind, heavy aperture, deep aperture, its machine means can be aperture of Huo aperture, bore, bore with a reamer, bore hole, tap. Use no matter why to plant the method machines which kind of aperture, writes NC program is the Kong Jia that calls the solidify on numerical control machine tool commonly labour secures a loop (Cycle) instruction code G73~G89. The treatment that alleged and fixed loop points to to cutting tool moves to be appointed to quickly first namely locally, machine designation deepness with cutting feed speed again, finally in order to cancel the treatment course of knife speed go back. Module of NX /Manufacturing automatic process designing not only if the aperture of a variety of forms such as standard getting, boring machines fixed loop,offerred, and still offerred peck auger (Peck Drill) mix bits is gotten (Break Chip) two kinds of emulation loops. Alleged emulation loop points to namely do not use G73~G89 of fixed loop instruction, but a kind of when imitate Kong Jia to be versed in fixed loop moves to realize Kong Jia to be versed in thereby special loop. The article will be discussed peck get and break bits to get these two kinds of emulation loops, analyse method of its cutting tool and the NC process after be being handled ever since, compare with similar fixed loop, show its characteristic and use. 1. Emulation loop 1) . Peck get emulation loop to produce to peck locally in each aperture treatment get emulation loop, graph 1 it is to peck get circular principle sketch map, specific treatment process is: Speed of ① cutting tool is apart from to the smallest safety (the A point with certain Min Clearance) ; ② cutting feed is nodded to D (after nodding B through be being begun by treatment aperture, continue feed cuts deep increment Increment) ; A of ③ fast fall back on is nodded (retreat a knife to arrive outside aperture enter at discharging bits and cutting fluid with benefit) ; ④ speed is nodded to C (before one times a pace enters the deflection on axial of knife of cutting deepness edge safe distance Distance) ; ⑤ cutting feed is nodded to F (cut deeply a pace cuts deep increment Increment with into distance Distance) . Repeat ⑤ of measure ③ ~ , the cutting deepness that till treatment arrives,appoints. The analysis pecks the circular course that get knowable, means of this kind of loop is similar to fixed loop G83, apply to deep Kong Jia to be versed in, but when should cutting deep increment Increment to be None, peck the circular course that get to will get simplifying, be similar to fixed loop G81, can use at the treatment of general aperture. Graph 1 peck get emulation loop sketch map 2) . Break bits to get emulation loop to produce to break bits to get emulation loop locally in each aperture treatment. Break bits to get a loop to be similar to peck get a loop, what what differ is: In feed each cut deep increment Increment later, namely after cutting tool reachs the D drop that the graph shows 1 times or F point, cutting tool is not the A dot that go back is apart from place to decide to the smallest safety outside aperture, retreat however return what by the deflection on axial of knife of current position edge a pace enters safety to be apart from place to decide locally, if pursue,shown C drop or an E are nodded. When retreating a knife, because cutting tool does not have cutting and high speed rotates, such OK will twine what go up in cutting tool to cut bits to be pulled, stop the aim of bits in order to achieve. The circular process that analyses bits getting is knowable, it is similar to fixed loop G73, agree with the aperture treatment of tenacity material, but when should cutting deep increment to be None, be similar to fixed loop G81, can use at the treatment of general aperture. 2. Because length place is restricted,method of emulation loop cutting tool is analysed, below cento peck one paragraph get circular cutter track. In this paragraph of cutter track, have GOTO sentence only. Actually, peck thoroughly in any in get or breaking bits to get circular cutter track, also have GOTO sentence only and do not have Cycle statement. This shows, the cutter track of emulation loop does not use fixed loop statement. FEDRAT/800. 0000GOTO/72.
0517, 35.
6093, 45.
0000PAINT/COLOR, 31 FEDRAT/250.
0000GOTO/72.
0517, 35.
6093, 35.
0000PAINT/COLOR, 37 FEDRAT/600.
0000GOTO/72.
0517, 35.
6093, 53.
The 0000 cutter track that be gotten to pecking or break bits to get emulation loop undertake an aftertreatment (Postprocess) later, all GOTO statements are transformed to be G00 and G01, be in namely PTP (NC) in the program, the circulation that uses G00 and G01 to control cutting tool to realize Kong Jia to be versed in only moves. Because G00 and G01 dictate twice this,the control in common machine tool has same pattern in the system. Accordingly, the Kong Jia that uses emulation loop place to write is versed in program and machine tool control the fixed loop inside the system to have nothing to do, also have nothing to do with the type of numerical control machine tool namely. So, use the NC program that emulation loop place writes, general applicably at machine tools of any a numerical control. In the meantime, notable is the NC program that creates by emulation loop longer, become especially hole depth is deeper, cut when deep increment is lesser, generated NC program is longer. But the data processing rate as a result of nowadays computer is very high, reason although the process is very long, also do not affect its are carried out and machine efficiency. 3. Conclusion ① uses means of two kinds of emulation loops, not only the order of Kong Jia project that can write deep aperture or increases material hard to be like tenacity material; ② if cut deep increment to set for 0, use emulation loop means to still can write the NC program that general Kong Jia is versed in; When ③ uses emulation loop to write NC program, need not consider or be familiar with the fixed loop instruction of the machine tool, and writes program has versatility, plant at how applicably the numerical control machine tool of the type (milling machine or machining center) ; ④ emulates a loop is to write a program automatically, can improve process designing efficiency and code quality tall. CNC Milling