The CNC machining center evolved from CNC milling machines. The main difference lies in its ability to automatically exchange machining tools. By installing tools of different purposes in the tool magazine, the machining tool on the spindle can be changed through an automatic tool changer during a single setup, thus achieving various machining functions.
Common questions and solutions for CNC machining centers are as follows:
Surface machining is uneven and rough.
Surface irregularities in machining are not only caused by the performance of cutting oil not meeting the processing requirements, but also by vibrations induced by the rapid movement of the tool when the tool feed rate is too fast. Sometimes, there may be some differences between the tool marks of adjacent two tool paths, which is due to the inconsistent cutting direction of the tool. To avoid this issue, the full-milling processing method should be adopted, along with the selection of cutting oil.
The surface milling tool marks are too pronounced.
The primary cause of this issue is the improper selection of the feed and retract positions. Different machining software offers various cutting methods, but all provide options for feed depth and retract parameters. Additionally, when non-specialized cutting oil is used, the insufficient extreme pressure and anti-wear properties can cause the oil film to break instantly during the machining process, resulting in scratches on the workpiece. To avoid the mentioned issues, adjustments can be made in four aspects.
1. The selection of the cutting point must be accurate.
If a cut in the middle is necessary, increase the overlap.
When finishing the side, use full cutting and deep processing.
Choose cutting oil for precision finishing.
Section 3: Knife Change Marks During Precision Milling
During regular and high-speed machining, tool changes are necessary. However, if the relevant parameter adjustments are not attended to during the tool change operation, noticeable marks can appear, significantly affecting the appearance of the workpiece. To address this issue, precision finishing of the workpiece's corner requires the use of smaller cutting tools. This is because the forceful movement during the machining process can easily create cutting marks at the corners.
After polishing, burrs or sharp edges may remain on the surface or sides.
Ensure utmost caution when using cutting tools, opt for specialized blades to maintain sharpness. Additionally, meticulously plan the cutting paths, incorporating a secondary cutting sequence: first, process the surface, then the side, and finally the surface again. This ensures the absence of burrs, which is particularly useful for workpieces that cannot be polished.
Special Shaped Parts Precision Machining
For the precision finishing of special-shaped workpieces, software often experiences fitting errors. Occasionally, the calculation errors are too great, leading to deformation of the workpiece and affecting its appearance. To address this issue, it is necessary to start with the software and control the errors. This value is quite reasonable; it neither hinders the calculation speed nor causes deformation to the workpiece.
Above is the content related to CNC machining centers. Hope it is helpful to you. For any other questions, welcome to consult Dongguan Jiuyi Precision Machinery Co., Ltd.
