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precision machinery manufacturing companies should standardize the correct operation of cnc machine tools by mechanics. cnc technicians are responsible for completing the processing of mold parts as required, ensuring safe production, and maintaining machine tools to extend the service life of the machine tools.

1. after the machine is powered on, the precautions are as follows:

after the machine tool is powered on, check whether the switches and buttons are normal and flexible, and whether the machine tool is abnormal;

check whether the voltage, oil pressure, and air pressure are normal. manual lubrication should be performed first for the parts with manual lubrication;

after the machine is turned on, each coordinate axis manually returns to the reference point (machine origin). if an axis is already at the zero position before returning to the reference point position, it must first move the axis to a position other than 100mm from the origin, and then manually return to the reference point or control the machine tool to move in the negative direction of the stroke at this position to make it return to the reference point;

when the table is rotated and exchanged, there must be no foreign objects on the table, on the shield and on the guide rail;

after the input of the nc program is completed, it should be carefully proofread to ensure that it is correct. it includes checking of codes, instructions, addresses, numerical values, signs, decimal points and syntax;

install and find the right fixture according to the process specification;

correctly measure and calculate the workpiece coordinate system, and verify and check the results obtained;

input the workpiece coordinate system to the offset page, and carefully check the coordinates, coordinate values, sign and decimal point;

after the tool compensation value (length, radius) is entered into the offset page, the tool compensation number, compensation value, sign and decimal point should be carefully checked.

2. during the workpiece processing, the precautions are as follows:

when forming high-precision workpieces, use a dial indicator to detect the tool on the spindle, so that its static runout is controlled within 3µm, and if necessary, it is necessary to re-clamp or replace the tool holder system;

regardless of whether it is a part to be processed for the first time or a part that is repeatedly processed periodically, it must be checked and checked one by one according to the drawing process, program and tool adjustment card before processing, especially for the tool length compensation and at the radius compensation point, make a trial cut if necessary;

when single-stage trial cutting, the quick override switch must be set to a lower gear;

when each knife is used for the first time, it must be verified whether its actual length is consistent with the given compensation value;

when the program is running, it is necessary to focus on several displays on the cnc system;

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

display of registers and buffer registers: you can see the contents of each status command of the program segment being executed and the content of the next program segment.

main program and subprogram display: you can know the specific content of the program segment being executed.

dialogue display (custom): you can know the current spindle speed of the machine tool, the current cutting feed rate, the cutting feed per revolution of the spindle, the current cutting load of the spindle and the cutting feed per revolution of the spindle loaded on each stroke to calculate the cutting amount of the corresponding tool per edge ;

during trial cutting and feeding, when the tool runs to the workpiece surface 30~50mm, it must be kept at low speed feed to verify whether the remaining coordinate values ​​of the coordinate axes and the coordinate values ​​of the x and y axes are consistent with the pattern;

for some knives with test requirements, the "progressive" method is adopted. for example, when boring a hole, you can try to boring a small length first, and then boring to the whole length after passing the inspection. the tool data using the tool radius compensation function can be modified from large to small while trial cutting;

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

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;

after the program is modified, the modified part must be carefully calculated and carefully checked;

during manual feed and manual continuous feed operations, it is necessary to check whether the positions selected by various switches are correct, clarify the positive and negative directions, identify the keys and the set feed speed or pulse magnification, and then operate.

3. after the workpiece is processed, the precautions are as follows:

after the whole batch of workpieces are processed, the tool number and tool compensation value should be checked, so that the tool number and tool compensation value in the program, offset page, adjustment card and process card are exactly the same; when the tool is reused, it should be re-setting the tool on the top can effectively reduce the impact of tool wear on the workpiece;

remove the tool from the tool magazine, press the adjustment card or program, clear the number and put it into the warehouse. disk, process and tool adjustment card are put into storage in complete sets;

remove the fixture, some fixtures should record the installation position and orientation, and make records and archives;

stop each coordinate axis at the middle position;

if you need to shut down at this time, you can press the power off button on the operation panel and wait for a while, so that the main shaft cooling oil in the main shaft can be automatically shut down after part of the return flow.