Nc machine tool maintenance: nc machine machining accuracy and error cause

Nc machine tool maintenance: nc machine machining accuracy and error cause

With the rapid development of China's industry, the requirements for the accuracy of parts are increasingly high. In order to improve the machining accuracy of nc machine tools, technicians must make a detailed analysis of the errors in the process of nc machining, find out the causes of the errors, and take timely measures to reduce production losses. The following make up the nc lathe and high-precision nc machine will appear machining errors and reasons:

Analysis the error of nc machine and its cause

First. Precision Of Nc Machine Tool

1. Machining error caused by error of nc machine tool: error of control system; Error of feed drive system of machine tool

2. Machining error caused by manufacturing process: unreasonable processing arrangement; Improper choice of cutting point

3. Error caused by workpiece positioning

4. Error caused by unreasonable programming

Senond. High-precision Cnc Machine Tool

1. The outer circle of high-precision CNC lathe is conical: the connecting line of front and rear centers is not coaxial with the spindle axis, which is caused by the wrong position of the center of the tail seat of the CNC lathe.

2. Vibration of workpiece during turning of CNC machine tools: it may be that the end seat sleeve is too long or the workpiece supports are too loose, or the turning tool is not sharp enough or the tip arc is too large, or the bearing clearance of rotary top is too large, or the clearance of middle or small sliding plate is too large.

3. Round beat can't meet the requirements: the circular beat caused by the front center center which is not coaxially with the spindle axis or bearing wear of rotary centers, the center hole of the workpiece is not cleaned or the center hole is brushed, and the chuck end face is touched by the bar of the center head of the chicken heart, which makes the center hole useless

4. Severe wear or gnaw of the center hole of high-precision CNC lathes: it may be caused by the use of fixed center without lubricating oil or excessive spindle speed, or by the failure of clamping of the jig chuck, when the workpiece stopped rotating.

The error sources generated when machining parts with nc machine tools are very complex. Only by reasonably mastering the principle of nc machine tools and strengthening the technical knowledge of operators can the error problem of nc machine tools can be solved well and the precision of nc machine can be improved to produce qualified products.