During the operation of the cnc machining center, there is a certain gap between the screw and the nut. With the increase of equipment running time, the gap gradually increases due to wear and tear. Therefore, the corresponding gap compensation for reverse motion is the main factor to overcome the shoulder generated on the machined surface. Gap measurement is usually done by the percentage meter measurement method, which requires error control.
However, it should be noted that gauge holders and gauge rods should not be extended too high or too long, because during the measurement process, due to the long cantilever, the gauge holders will be moved by forces, which will lead to inaccurate counts and errors in the compensation values.
Improper tool selection in CNC machining can also lead to dimensional errors. During the cutting process, the tool removes material through the main cutting edge. However, after the arc crosses the quadrant and the arc is tangential to the second cutting edge of the tool, the second cutting edge can be involved in the cut. Therefore, the wedge angle of the tool must be carefully considered when selecting or grinding the tool.
During CNC machining, errors can also occur if the machining allowance is not uniform. Whether the machining allowance of the surface to be CNC machined is even or even not is also important in achieving the design performance of the part. Because the machining allowance is not uniform, it is easy to cause "remapping" errors. Therefore, for parts with high surface shape requirements, the machining allowance should be made as even as possible before forming, or multiple contours should be machined to meet the design requirements.
CNC machining has clear regulations on the shop environment and the need to reduce heat sources: the focus is on spindle bearing speed, clearance adjustment and reasonable preload. For thrust bearings and tapered roller bearings, due to their harsh operating conditions and high heat generation, thrust angular contact ball bearings can be used when necessary to minimize friction and heat generation in certain parts.
CNC machining also needs heat insulation: keep the heat source away from the spindle, such as isolating the motor and drive, using a separate drive, etc. CNC machining also needs heat dissipation: strengthen lubrication and cooling, using oil cooling, air cooling and other methods to accelerate heat dissipation. Reduce the impact of thermal deformation:No matter what method is used, it can only reduce thermal deformation, it is difficult to completely eliminate thermal deformation. Therefore, measures should also be taken to reduce the impact of thermal deformation.
