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Inclined thread turning tool straight-through thread turning tool 6) There are constant type (ap1=ap2==apn) and decreasing type (ap1>ap2>>apn). Whether the ap value is correct or not is directly related to whether the thread is qualified, and the choice of the amount of back-feeding of the thread and the number of passes are also particularly important. Due to the constant type, the cutting area is gradually increased, and the cutting area is gradually increased, which is easy to cause the thread turning to be unclean. Therefore, the amount of thread backing is generally reduced when the automatic bonding machine is processed. The calculation can be decremented according to the following formula, or the number of cuts and the number of cuts can be determined by looking up the table.
G92 and G76 are fixed cycle instructions for thread machining. The difference is that the thread processing can be performed once every time with G92, and G76 can be executed repeatedly until the blank is processed into the required thread. The command format of G92 and G76 is as follows: G92XZIF; G76XZIKDFAP; 2 The use of thread machining instructions The following examples are used to analyze the usage of different programming instructions.
Example turning the workpiece M161 thread as shown. The thread diameter is 16mm, the total back knife is 0.65mm, and the three-feed back knife is ap1=0.3mm, ap2=0.2mm, ap3=0.15mm, and the advance and retraction section is 1=2mm, 2=1mm. The feeding method is the straight forward method. By comparison, it is not difficult to find that the G92 and G32 notes are the same. The difference is that the G92 can complete all the actions from the ABCDA four instructions, which makes the program simplified and the programming efficiency improved. Therefore, G92 and G76 are also called simplified programming instructions and are widely used in programming. When the number of cutting times is small, it is better to use G32 or G92 command programming. When the number of cutting is more, it is better to use G76 or G92. In actual programming and processing, we can choose according to the need, simplify the program and improve the programming efficiency.
Precautions for thread processing (1) Before turning, it is advisable to check whether the position of each button is correct, and then perform a simulation test run, especially before high-speed turning of the thread, it is necessary to test it once for safety; (2) CNC high-speed car When threading. Because the CNC high-speed thread drive motor, especially the motor in the direction of the cutter, is affected by the sharp change of the lifting frequency, the spindle speed of the lathe can only be within the required range; (3) It is strictly forbidden to use the cotton yarn during the rotation of the lathe spindle. Wipe the threaded surface of the car to avoid personal injury; (4) When performing the threading program, random suspension will not be allowed in the middle to avoid machine damage and personal injury. Especially in the case of high-speed turning of thread with large pitch, the micro-mini centrifuge is more likely to have an accident, and the consequences are more serious; (5) the spindle speed must be kept constant from rough cutting to fine cutting, otherwise the lead is not accurate.
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