Improving CNC milling accuracy involves many factors. The key lies in tool design, processing parameter selection and vibration control. First of all, the helix angle of the tool directly affects the chip removal effect and surface roughness, while the feed amount and tool service life will also significantly affect the processing quality. In addition, machine tool vibration is an important factor affecting machining accuracy, which may be caused by improper clamping, incorrect tool selection, or machine tool transmission problems. By optimizing tool selection, reducing vibration, and controlling processing parameters, processing accuracy and surface quality can be effectively improved.
Helix Angle Problem on the Tool
At present, the helix angles specified on machine tools are divided into 30°, 45°, and 60°, which have different applications in different places. The 30° helix angle is better than the other two in chip removal performance, but it is not easy to cut harder workpieces and hole and slot milling. The tool with a helix angle of 45° has greater power and can process grooves, but the processed surface will appear very rough. The 60° tool processes some large areas and is most often used for side processing. When the helix angle increases, greater processing force can be obtained during processing, and a sharper blade will be used to process harder workpieces, but the processed surface will be rougher.
Feed Size Reflects the Processing Effect
When the 밀링 커터 performs processing work, in order to achieve the continuation of many different textures, it is necessary to frequently alternate between different blades. At this time, different processing operations of different blades will make the textures to be processed show different effects at different speeds. Therefore, in order to compare the experimental data, the same rotation speed of the blade was set in the experiment, and the feed speed was changed. At the same time, the feed speed remains unchanged while the rotation speed is changed. Finally, it is concluded that when the rotation speed is high and the feed speed is low, the surface roughness will be improved. Then, when better surface roughness is needed in practice, the feed amount needs to be reduced. At the same time, many things should be paid attention to during the installation of the tool, such as the correct installation method.
Influence of the Number of Times the Blade is Used
In the tools that are used many times, irreversible damage such as chipping and deformation often occurs. The main source of wear when using these tools is the friction caused by changing the blade. When using these tools, the surface roughness of the parts is obviously different, and the processing effect is significantly reduced. In the parts that have not been processed yet, it can be found that sometimes some marks will be left on the processed surface, and the most common one is burrs. These are caused by the wear of the blade mentioned above. At this time, the simplest way to deal with it is to replace the tool. In addition, increasing the flow rate of cutting fluid is also a good way to deal with it.
Impact of Mechanical Vibration
이유 Vibration of CNC 중아프네 티멍청아
Improper operation during part clamping: When processing parts with complex shapes or parts that are too small or irregular, errors may occur during operation, causing the parts to loosen during processing.
Incorrect tool selection: For example, when processing hard materials, if the tool has a small helix angle, it will easily cause vibration. Incorrect tool type selection will cause vibration during processing.
Too much processing in a short period of time: In actual operation, the linear speed of the tool needs to change with the surface width and feed speed of the workpiece to be processed. The large difference between the tool rotation speed and the cutting speed will affect the cutting resistance of the tool, thus becoming a vibration source. In addition, it is also necessary to pay more attention to the frequency of tool change in actual operation. Even if the operation is standardized, the tool will inevitably be damaged.
CNC milling machines will also cause vibration during mechanical transmission, thereby affecting the tool. If the maintenance work is not in place or there is a problem with the lubrication system, the hardware will be damaged, resulting in vibration.
Mechanical transmission error of the same CNC machine tool. CNC machine tools will have different effects on the spindle under different numerical settings. Different spindle speeds will cause different sliding of the blade, resulting in poor cutting effect.
그만큼 나nfluence of Vibration of the CNC 중아프네 티으악 나tself
Vibration during processing causes problems such as wave ripples that should not appear after processing, which will affect the surface accuracy of the processed surface and increase the surface roughness of the processed parts. At the same time, problems such as relative displacement between the workpiece and the tool will also make the deformation of the workpiece more serious, affecting the roughness and dimensional accuracy of the processed surface, so that the final processed part cannot reach the actual required accuracy.
When the machine tool vibrates, the service life of the tool on the machine tool will also be affected by this vibration, resulting in obstruction of normal cutting of the tool, increased damage to the tool, and easy occurrence of chipping. Maintaining this state will make the processing inaccurate.
어떻게 아르 자형educe or 이자형ven 이자형liminate V축하
Clamping the workpiece: When clamping the workpiece, it should be clamped in a location with good rigidity and small deformation to reduce the vibration caused by the cutting force.
Tool selection: For the processing of plastic materials, alloy tools with higher hardness should be used for processing, and for the processing of brittle materials, alloy tools with stronger wear resistance should be used for work. Materials with strong vibration resistance are often used for rough processing of various high-hardness metals; materials with corrosion resistance are used for fine processing during use.
In actual operation, the rigidity of the tool can be strengthened to resist damage by reducing the use length of the milling cutter.
When selecting tools with different helix angles and numbers of blades, it should be noted that when the tool needs to have stronger resistance, it is a good method to choose a tool with a larger helix angle and number of blades.
When programming, using different methods to reduce the rotation or feed speed of the working tool can reduce the impact of vibration.
