数控车常用复合g71、g72、g73命令应用方法（Application method of compound G71, G72 and G73 command for numerical control car）.docVIP

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数控车常用复合g71、g72、g73命令应用方法（Application method of compound G71, G72 and G73 command for numerical control car）.doc

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数控车常用复合g71、g72、g73命令应用方法（Application method of compound G71, G72 and G73 command for numerical control car）

数控车常用复合g71、g72、g73命令应用方法（Application method of compound G71, G72 and G73 command for numerical control car） CNC lathe compound commands (G71, G72, G73, G74, G75, G76) are often used, suitable for processing larger parts and forgings, castings processing programming. A composite command does not need to write a finished program paragraph, not only with fewer program segments, but also shortens the programming time effectively. Complex commands are rough loops and need to be refined with the G70 command. Here are the commonly used composite commands G71, G72, G73 usage and processing route analysis (the following are FANUC system as an example). 1.G71 - internal and external rough finishing cycles G71 crude cycle command is mainly used for radial size requirements of relatively high, axial size larger than the radial size of rough workpiece, the rough car cycle. (1) format G7l U (d) R (E); G71 P (NS) Q (n? U) (U) W (delta omega) (? F) S (s) T (t); G70 P (NS) Q (n?); Format, D for cutting depth (the radius value is specified, without a sign, and for the e instruction mode); Cutter Withdrawal (modal ns instruction); fine car segment start paragraph number; n? for finishing the segment end paragraph number; u for the X axis direction. Allowance (signed, the diameter of instruction); delta omega Z axis allowance (signed); ? s, t, feed rate, rough machining cycle of spindle speed and tool function; G70 for finishing the cycle, this command cannot be used alone, with the rough cutting cycle instruction. (2) illustrates the cycle path as shown in Figure 1, AB for the workpiece contour, the tool start point from C fast moving to D, the moving distance for fine car allowance, and then according to the given cutting depth of X axis feed, axial turning, when retracting by Cutter Withdrawal of E 45. After the return of the knife, it moves rapidly to the starting point of the cycle, completes a rough cycle, and then carries out many cycles according to the cutting depth. The last