1. Manual programming operation of CNC lathe
Input the programmed processing program into the numerical control system, the specific operation method is: first start the numerical control machine tool through the mechanical operation panel, then input the processing program from the CRT/MDI panel, and then run the processing program.
1) Start CNC machine operation ①Machine start button ON ②Program lock button OFF
2) Editing operation ①Select MDI mode or EDIT mode ②Press (PRGRM) key ③Enter program name key in program address and program number characters and then press (INSRT) key. ④Enter the program segment. ⑤Enter the program segment number and operation instruction code and then press the (INPUT) key.
3) Run program operation ①Program lock button ON ②Select automatic cycle mode
2. Calling program operation of CNC lathe
To call the machining program stored in the CNC system, the specific operation method is to start the CNC machine tool through the mechanical operation panel, then call the machining program in the system, and then run the program.
1) Start CNC machine operation ①Machine start button ON ②Program lock button OFF
2) Operation of calling program ①Select MDI mode or EDIT mode ②Press (PRGRM) key ③Call program key in the program address character and program number character and press (INPUT) key.
3) Run program operation ①Program lock button is ON ②Select automatic cycle mode ③Press automatic cycle button
3. Tool setting operation of CNC lathe
There are three tool setting methods for CNC lathes: trial cutting tool setting, mechanical tool setting and optical tool setting.
1) Trial cutting tool setting principle
Suppose that the tool post is replaced with a cutting knife at the position of the external circular knife. Although the tool post does not move and the coordinate position of the tool does not change, the two tool tips are not at the same position. If you do not eliminate the knife generated after this tool change The tip position error is bound to cause the machining error after the tool change.
Calculation of tool nose position error after tool change: ΔX=X1-X2 ΔZ=Z1-Z2
According to the principle of tool setting, the numerical control system records the tool nose position error ΔX, ΔZ after the tool change. If the tool position compensation method is used to determine the tool nose coordinate position after the tool change, it can ensure the cutting accuracy of the tool on the workpiece.
2) Reference tool setting operation
①Cut the end face of the workpiece with an external turning tool, and input the Z coordinate of the tool tip position to the CNC system.
②Cut the outer circle of the workpiece with an excircle turning tool, measure the outer circle diameter of the workpiece, and input the measured value of the outer circle diameter of the workpiece to the CNC system, that is, the X coordinate of the tool tip position.
3) General tool-to-tool operation
Align the point of intersection of the end face of the workpiece with the side generatrix with the tip of the cutting knife, and input the Z and X coordinates of the position of the cutting tip to the CNC system. In this way, the numerical control system records the different coordinate values of the two tool noses at the same position, calculates the position deviation of the tool nose position of the general tool and the reference tool after the tool change, and eliminates the tool position deviation after the tool change through the CNC system tool position deviation compensation Tip position deviation.
4. Modification and application of tool position offset value
If the outer circle of the workpiece is turned, the outer circle diameter of the workpiece is 0.30mm larger. This can be solved by modifying the tool position offset value without modifying the program, that is, reducing the tool position offset value in the X direction by 0.30mm, which can easily solve the machining error generated in the cutting process.
