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CNC lathe machining accuracy problem

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

Position error refers to the change or deviation of the mutual position between the actual surface, axis or symmetry plane of the machined part relative to its ideal position, such as perpendicularity, position, symmetry, etc.

The position error in CNC machining usually refers to the dead zone error. The main reason for the position error is the machining error caused by the clearance and elastic deformation of the machine parts in the transmission process.

During processing, the tool head of the machine tool needs to overcome factors such as friction, resulting in position errors. In an open-loop system, the position accuracy is greatly affected, while in a closed-loop servo system,

Then it mainly depends on the accuracy of the displacement detection device and the speed amplification factor of the system, and generally has less impact.

Machining accuracy error caused by geometric error in CNC lathe machining:

In CNC lathe processing, due to the influence of external factors such as external force and heat generated by tools and fixtures, the geometric accuracy of the lathe is affected.

Parts machined on a lathe are geometrically deformed, resulting in geometric errors.

According to research, there are two main reasons for the geometric error of CNC lathes: internal factors and external factors.

The internal factors that cause the geometric errors of the lathe refer to the geometric errors caused by the factors of the machine tool itself.

Such as the levelness of the lathe table, the levelness and straightness of the lathe guide rails, the geometric accuracy of the lathe tools and fixtures, etc.

External factors mainly refer to the geometric errors caused by the external environment, thermal deformation and other factors during the processing. For example, during the cutting of a tool or part,

Due to thermal expansion and deformation, geometric errors will occur, affecting the machining accuracy of the lathe and the machining accuracy of the parts.

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

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

From the structural point of view, most of the machining errors of CNC lathes are caused by the positioning accuracy, and the feed system of the lathe is the main link that affects the positioning accuracy.

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

In a closed-loop system, the CNC lathe can usually prevent the positional deviation of the main components in the feed system, such as the ball screw, through the positioning detection device.

For the open-loop system, due to the many influencing factors and the complex situation, positioning monitoring cannot be performed, so it has a great impact on the machining accuracy of the CNC lathe.

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 CNC technology, the whole process of CNC lathes is monitored in real time, and the error links in the processing process are adjusted in time.

And collect the error data of each link in the processing process, feed it back to the control terminal, and use the corresponding error compensation mechanism through the error data,

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

CNC lathe features:

1: Integral casting bed: power bed head, casting knife table, casting tailstock

2: 4KW spindle motor adopts variable frequency stepless speed regulation device

3: XZ axis adopts TBI ball screw drive

4: CNC control system: easy to operate and easy to learn: it has the functions of stepless speed regulation of processing speed, power-off memory, etc.

5: Main functions: car modeling, cable pulling, twisting, round carving, line carving

Widely used in stair columns, table and chair legs, bedside posts, cylinders, cones, arcs, spheres and other rotating products.