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[Mold knowledge] A qualified CNC operator, the operating rules to be followed

A、After the machine is powered on, the matters needing attention are as follows:

1. After the machine is powered on, check whether the switches and buttons are normal and flexible, and whether the machine is abnormal;

2. Check whether the voltage, oil pressure, and air pressure are normal, and manually lubricate the parts with manual lubrication first;

3. After the machine is turned on, each coordinate axis manually returns to the reference point (machine origin). If an axis is at the zero position before returning to the reference point position, the axis must first be moved to a position 100mm away from the origin, and then the reference point is manually returned or the machine tool is controlled to move in the negative direction of the stroke at this position to make it return. Reference point

4. When the worktable is rotated and exchanged, there must be no foreign matter on the table, on the guard, or on the guide rail;

5. After the NC program is input, it should be carefully proofread to ensure that it is correct. Including code, instruction, address, value, sign, decimal point and grammar check;

6. Install and find the right fixture according to the process regulations;

7. Correctly measure and calculate the workpiece coordinate system, and verify and check the results obtained;

8. Enter the workpiece coordinate system into the offset page, and carefully check the coordinates, coordinate values, sign and decimal point;

9. After inputting the tool compensation value (length, radius) into the offset page, carefully check the tool compensation number, compensation value, sign and decimal point.


B. In the process of workpiece processing, the matters needing attention are as follows:

1. When forming high-precision workpieces, use a dial indicator to detect the tool on the spindle to control the static runout within 3 µm, and re-clamp or replace the tool holder system if necessary;

2. Whether it is a part to be processed for the first time or a part to be repeatedly processed periodically, before processing, it must be checked and checked on a tool-by-tool and program-by-program basis in accordance with the drawing process, procedure and tool adjustment card;

3. When single-segment trial cutting, the rapid override switch must be set to a lower gear;

4. When each tool is used for the first time, it must be verified whether its actual length is consistent with the compensation value given;

5. During the running of the program, it is important to observe several displays on the CNC system:

Coordinate display: You can understand the current position of the tool movement point in the machine tool coordinate system and the workpiece coordinate system, understand the movement amount of this block, and how much remaining movement amount, etc.;

Register and buffer register display: you can see the contents of each status instruction of the executing program segment and the next program segment: main program and subprogram display: you can understand the specific content of the executing program segment;

Dialogue display screen (Custom): You can know the current spindle speed, current cutting feed rate, cutting feed per revolution of the spindle, current cutting load of the spindle, and load of each stroke axis, and the corresponding tool per revolution can be calculated from the cutting feed per revolution of the spindle. Cutting amount of the edge.

6. During trial cutting and feed, when the tool runs to the surface of the workpiece 30~50mm, it must be maintained at low speed to verify whether the remaining coordinate values ​​of the coordinate axis and the X and Y axis coordinate values ​​are consistent with the pattern;

7. For some tools that have test tool requirements, adopt the "gradual" method. For example, for boring, you can test a short length of boring first, and then boring to the entire length after passing the test. The tool data using the tool radius compensation function can be modified from large to small, while trying to cut;

8. During trial cutting and processing, after changing tools and auxiliary tools, be sure to re-measure the tool length and modify the tool compensation value and tool compensation number;

9. When retrieving the program, pay attention to whether the position pointed by the cursor is reasonable and accurate, and observe whether the coordinates of the tool and the machine tool movement direction are correct;

10. After the program is revised, the revised part must be carefully calculated and checked;

11. During manual feed and manual continuous feed operations, you must check whether the positions selected by the various switches are correct, figure out the positive and negative directions, look for the keys and the set feed speed or pulse override before proceeding operate.


C. After processing the workpiece, the matters needing attention are as follows:

1. After processing the whole batch of workpieces, check the tool number and tool compensation value to make the tool number and tool compensation value in the program, offset page, adjustment card and process card completely consistent; Re-calibration on the tool instrument can effectively reduce the impact of tool wear on the processed workpiece;

2. Remove the tool from the tool magazine, press the adjustment card or program, and clear the number and put it into the library. The disk, process, and tool adjustment card are put in the warehouse as a set;

3. Remove the fixture, some fixtures should record the installation position and orientation, and make a record and archive;

4. Stop each coordinate axis at the middle position;

5. If you need to shut down at this time, you can press the power disconnect button on the operation panel and wait for a while to automatically shut down after the spindle cooling oil in the spindle has partially returned.


Post time: Oct-15-2021