Accuracy issues in CNC lathe machining
The impact of positional errors in CNC lathe machining on machining accuracy:
Position error refers to the degree of variation or deviation between the actual surface, axis, or symmetry plane of the machined part relative to its ideal position, such as verticality, positional accuracy, symmetry, etc.
The position error in CNC machine tool machining usually refers to dead zone error, and the main reason for the position error is the machining error caused by the clearance and elastic deformation generated during transmission during the machining of machine parts,
In addition, during machining, the tool head of the machine tool needs to overcome factors such as friction that may cause positional errors. The position accuracy is greatly affected in open-loop systems, while in closed-loop servo systems,
It mainly depends on the accuracy of the displacement detection device and the speed amplification coefficient of the system, and the impact is generally small.
The machining accuracy error caused by geometric errors in CNC lathe machining:
In the machining of CNC lathes, the geometric accuracy of the lathe is affected by external factors such as external forces and heat generated by the cutting tools and fixtures during machining,
The components processed on the lathe undergo geometric deformation, resulting in geometric errors.
According to research, there are two main reasons for geometric errors in CNC lathes: internal factors and external factors.
The internal factors that cause geometric errors in lathes refer to the geometric errors caused by the machine itself,
Such as the levelness of the worktable of the lathe, the levelness and straightness of the lathe guide rail, and the geometric accuracy of the lathe tools and fixtures.
External factors mainly refer to geometric errors generated under the influence of external environment and thermal deformation during the machining process, such as cutting tools or components,
Due to thermal expansion and deformation, geometric errors are generated, which affect the machining accuracy of the lathe and the machining accuracy of components.
The machining accuracy error caused by lathe positioning in CNC lathe machining:
Through long-term data analysis and practical operation of component processing, it can be seen that lathe positioning has a significant impact on the machining accuracy of CNC lathes.
The machining errors of CNC lathes are mainly caused by positioning accuracy from a structural perspective, and the feed system of the lathe is the main link that affects positioning accuracy.
The feed system of a CNC lathe usually consists of two parts: a mechanical transmission system and an electrical control system, and the positioning accuracy is related to the mechanical transmission system in structural design.
In closed-loop systems, CNC lathes can usually prevent positional deviations of major components in the feed system, such as ball screws, through positioning detection devices.
For open-loop systems, due to multiple influencing factors and complex situations, positioning monitoring cannot be carried out, which has a significant impact on the machining accuracy of CNC lathes.
Countermeasures to improve the machining accuracy of CNC lathes:
Improving machining accuracy by controlling the original error of CNC machine tools
Reasonably design the core components of machine tools to avoid positioning errors
Improving the machining accuracy of CNC machine tools through real-time monitoring technology
With the continuous improvement of CNC technology, real-time monitoring of the entire machining process of CNC lathes is carried out, and error links in the machining process are adjusted in a timely manner,
And collect error data for each step of the processing process, feedback it to the control terminal, and adopt corresponding error compensation mechanisms based on the error data,
Timely error compensation can effectively improve the machining accuracy of parts.
