Difficulties encountered in lathe processing

Common problems in lathe processing mainly include poor surface finish, abnormal noise, dimensional accuracy exceeding the tolerance, abnormal tool wear and program operation interruption, etc. The following are the specific causes and solutions:

The surface finish is poor

1. Tool issues ‌ : Edge wear, edge curling or incorrect installation angles can cause surface roughness. It is recommended to use sharp cutting tools (with a radius of 0.4-0.8mm of the tool tip arc), and ensure that the height difference between the tool tip and the center of the workpiece is no more than 0.1mm.

2. Improper cutting parameters ‌ : The rotational speed and feed rate need to be adjusted according to the material. The processing speed of carbon steel is 800-1200 revolutions per minute, and the feed rate is 0.1-0.15mm per revolution. The processing speed of stainless steel is 600-1000 revolutions per minute, and the feed rate is 0.08-0.12mm per revolution.

Abnormal noise problem

1.   Tool abnormality ‌ : If the cutting edge is cracked or the installation is skewed, a "squeaking" sound will be made. The condition of the tool needs to be checked and replaced in time.

2.  Transmission component failure ‌ : If a "clicking" sound occurs during idling, it may be due to poor gear meshing or bearing wear. Lubrication and clearance need to be checked. ‌
   

The dimensional accuracy exceeds the tolerance

1. Tool compensation error ‌ : Re-measure the tool wear amount by the trial cutting method and correct the compensation value.

2.  machine tool clearance not calibrated ‌ : Regularly detect and compensate for machine tool clearance with a laser interferometer.

   
   

Abnormal wear of cutting tools

1. Improper ‌ parameter setting ‌ : the cutting speed is too fast or the feed rate is too large, causing plastic deformation or chipping of the blade. The rotational speed needs to be reduced and cooling increased.

2.  Material property differences ‌ : When processing high-strength alloy materials, it is recommended to use coated cemented carbide tools or high-pressure internal cooling systems.

Program operation interruption

1.   G code error ‌ : The program format needs to be verified. Perform an empty run simulation and check the coordinate system matching.

2. Equipment failure ‌ : After the vibration monitoring system issues a warning, the spindle speed should be adjusted first to avoid the resonance frequency range.

It is recommended to check key indicators such as guide rail lubrication and spindle temperature rise every day, and establish standardized operation procedures to improve equipment utilization.