(2) Compilation of G code program Because the capacitance capacity we provide is limited, incremental programming is used for the retreat distance during programming. The specific examples are as follows:
In the previous program, line N56 indicates that the ESR function of each machine axis is enabled.
The N70 behavior is a conditional discrimination. The specific meaning is to activate the ESR function when the external power supply of the machine tool suddenly loses power.
LFPOS indicates that the axial direction is retracted in a specific direction.
POLF[Y]=IC(-2.5) indicates that the specified retraction axis is the Y axis, IC() indicates the distance retracted incrementally, and the direction and distance are specified in parentheses, as (-2.5) indicates The axial direction is retracted by 2.5 mm in the negative direction. In practical applications, the values ​​in the brackets can be defined as needed.
POLFMASK (Y) indicates that the Y-axis retraction function is activated.
POLFMASK() indicates that the retraction function of the Y axis is canceled.
What needs to be further mentioned here is that if the spindle is a servo spindle, in the case of a sudden power failure of the external power supply, the conditions of the safety conditions may be considered when the spindle does not immediately hold the brake, because the spindle load changes rapidly. The spindle motor will return the electric energy to the drive DC bus side at the moment of power failure, which provides the necessary guarantee for the driving energy of the retracting shaft emergency retreat.
4. Conclusion
We conducted on-site testing at the assembly site and practiced according to the above-mentioned contents. When the external power supply was manually powered off, the linear feed axis (Y) of the machine tool achieved emergency retraction according to the designed retraction direction and distance. Very good, to meet the needs of users. After the machine tool was shipped from the factory to the user site for installation and debugging, the user accepted the machine tool and conducted a key test on this function. The result was very satisfactory to the user. From the time the machine is put into operation, every time the retracting function is running normally, it greatly reduces the damage caused by the sudden power failure to the tool and the workpiece, and reduces the loss caused by unexpected factors for the user. Brought a good reputation.
For more articles, please refer to "Metal Processing" Cold Processing 2008 No. 1
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