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What are the knowing precision of CNC lathe machining

Molto Precise Machining Co.,Ltd | Updated: Dec 26, 2018

What are the knowing precision of CNC lathe machining?


The influence of position error on machining accuracy in CNC lathe machining:


The position error refers to the degree of deviation or deviation of the mutual position between the actual surface, the axis or the symmetry plane of the processed part relative to its ideal position, such as the perpendicularity, the positional degree, the symmetry, and the like.


The position error in the machining of CNC machine tools usually refers to the dead zone error. The reason for the position error is mainly caused by the machining error caused by the gap and elastic deformation generated during the machining of the machine parts.


And in the processing, the cutter head of the machine tool needs to overcome the friction and other factors to cause positional errors. In the open loop system, the position accuracy is greatly affected, and in the closed loop servo system,


It mainly depends on the accuracy of the displacement detecting device and the speed amplification factor of the system, and the general influence is small.




Machining accuracy error due to geometrical errors in CNC lathe machining:


In the machining of CNC lathes, the geometric accuracy of the lathe is affected by the external factors such as the external force and the heat generated by the machining.


Geometrical deformation occurs in the parts machined on the lathe, resulting in geometric errors.


According to research, the main reasons for the geometric error of CNC lathes are nothing more than the following two factors: internal factors and external factors.


The internal factor of the geometric error of the lathe refers to the geometric error caused by the factors of the machine itself.


Such as the level of the work surface of the lathe, the level and straightness of the lathe rail, the geometric accuracy of the lathe tool and the fixture.


External factors mainly refer to geometric errors caused by factors such as external environment and thermal deformation during processing, such as cutting tools or parts during cutting.


Due to thermal expansion and deformation, geometric errors occur, which affects the machining accuracy of the lathe and the machining accuracy of the components.


What are the knowing precision of CNC lathe machining





Machining accuracy error caused by lathe positioning in CNC lathe processing:


Through long-term data analysis and practical operation of parts processing, it can be seen that the positioning of the lathe has a great influence on the machining accuracy of the CNC lathe.


The machining error of CNC lathe is caused by the positioning accuracy from the structural point of view. The feeding system of the lathe is the main link that affects the positioning accuracy.


The feed system of a CNC lathe usually consists of a mechanical transmission system and an electrical control system. The positioning accuracy is related to the mechanical transmission system in the structural design.


In closed-loop systems, CNC lathes can often prevent positional deviations in the main components of the feed system, such as ball screws, by means of position detection devices.


For the open-loop system, due to many influencing factors and complicated conditions, it is impossible to carry out positioning monitoring, so the machining accuracy of the CNC lathe has a great influence.




Countermeasures to improve the machining accuracy of CNC lathes:


Improve machining accuracy by controlling the original error of CNC machine tools


Reasonable design of the core components of the machine tool to avoid positioning errors


Improve the machining accuracy of CNC machine tools through real-time monitoring technology


With the continuous improvement of numerical control technology, the whole process of CNC lathe processing is monitored in real time, and the error link in the processing process is adjusted in time.


The error data of each link in the processing process is collected and fed back to the control terminal, and the corresponding error compensation mechanism is adopted through the error data.


Timely error compensation can effectively improve the machining accuracy of parts.


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