1, Accuracy level of CNC milling
The accuracy of CNC milling is one of the important indicators to measure its machining capability. Under ideal conditions, high-end CNC milling machines with high-quality cutting tools and reasonable processing parameters can achieve extremely high machining accuracy. Specifically, the accuracy of CNC milling can be measured from the following aspects:
Dimensional accuracy: CNC milling can accurately control the dimensions of machined parts, including linear dimensions such as length, width, and height. On high-end devices, the dimensional accuracy can reach within ± 0.01mm or even higher. This means that the deviation between the actual size of the machined part and the design size is very small, almost negligible.
Shape accuracy: CNC milling can process various complex three-dimensional shapes with extremely high shape accuracy. Whether it is a flat, curved or irregular surface, CNC milling can ensure that its shape is consistent with the design drawing with minimal error.
Position accuracy: During the machining process, CNC milling can accurately control the relative position relationship between various machining elements, such as parallelism, perpendicularity, coaxiality, etc. The control of these positional accuracies is crucial for ensuring the overall accuracy and assembly performance of the machined parts.
Surface roughness: The surface roughness of CNC milling is also an important aspect of measuring its accuracy. By selecting appropriate tools, machining parameters, and cutting fluids, CNC milling can achieve very smooth machining surfaces, with surface roughness reaching Ra0.8 μ m or even lower.
2, Factors affecting CNC milling accuracy
Although CNC milling has high precision, its accuracy level is still affected by various factors. The following are the main factors that affect CNC milling accuracy:
Machine tool accuracy: The geometric accuracy, motion accuracy, and positioning accuracy of the machine tool directly affect the accuracy of the machined parts. High precision CNC milling machines are the foundation for ensuring machining accuracy.
Tool performance: The material, geometric shape, sharpness of the cutting edge, and wear of the tool can all affect machining accuracy. High quality cutting tools can maintain high cutting efficiency and machining accuracy.
The selection of machining parameters such as cutting speed, feed rate, and cutting depth has a significant impact on machining accuracy. Reasonable machining parameters can reduce the impact of cutting force and cutting heat on the workpiece, and improve machining accuracy.
Material properties: The hardness, toughness, thermal conductivity, and other characteristics of the processed material can also affect machining accuracy. The processing difficulty and precision requirements of different materials vary, and it is necessary to choose appropriate processing strategies and parameters.
Environmental factors: Environmental factors such as temperature and vibration during the machining process can also affect machining accuracy. Maintaining a stable processing environment is the key to ensuring machining accuracy.
3, How to improve the accuracy of CNC milling
To improve the accuracy of CNC milling, the following aspects can be taken into consideration:
Choosing high-precision machine tools: Choosing CNC milling machines with high precision is the primary condition for improving machining accuracy. High precision machine tools can provide a more stable machining environment and more precise machining control.
Using high-quality cutting tools: Choosing high-quality cutting tools that are suitable for the material being processed and the processing requirements can maintain high cutting efficiency and machining accuracy. At the same time, regular inspection and replacement of cutting tools are also important measures to maintain machining accuracy.
Optimizing processing parameters: Choosing appropriate processing parameters based on the characteristics of the processed material and processing requirements is the key to improving processing accuracy. Finding the optimal combination of machining parameters through experimentation and optimization can significantly improve machining accuracy.
Controlling the machining environment: Maintaining a stable machining environment is a necessary condition to ensure machining accuracy. During the machining process, it is necessary to control factors such as environmental temperature, humidity, and vibration to reduce the impact of external interference on machining accuracy.
Strengthening quality control: Establishing a sound quality control system is an effective means to improve machining accuracy. By strengthening quality inspection and control during the machining process, timely detection and correction of machining errors are ensured to ensure high precision and quality of the machined parts.
