High speed, high efficiency and environmental protection: important trends in modern tool cutting technology (4)
(III) Discussion on modern manufacturing methods
Figure 4: Relationship between tool life and cooling lubrication conditions during titanium machining [ordinate: tool life / cutting length (l/m)
What is modern manufacturing? The first is the modern hardware, which includes the use of advanced machine tools, CNC machining systems, and advanced tools. In terms of software, one is the improvement of cooling and lubrication technology and conditions, and the other is the optimization of cutting parameters (ie optimization of processing technology). . In China's aerospace industry, the government has invested in a large number of internationally advanced equipment, but found that it still cannot achieve very efficient and efficient processing. After repeated experiments, it was found that the software needs to be improved. It can be seen that modern manufacturing not only needs to invest in a large number of advanced instruments and equipment, but should be better armed in terms of knowledge and advanced technology.
Adjustments in cutting parameters, different practices in different companies, are a matter of opinion, and will not be repeated here. From the tool itself, the most important thing is to improve the life of the tool. As mentioned above, tool life is closely related to the conditions and methods of cooling lubrication. High-speed cutting also promotes green cooling/lubrication technology. Here is a new technology for cooling lubrication. If nitrogen is added to a cold oil mist (below 10 ° C), the tool life can be increased by 10 times. At the same time, it can improve processing efficiency, reduce pollution and improve surface processing quality. Particularly suitable for processing difficult materials such as titanium alloys (Fig. 4).
The deviation caused during machining directly affects the cutting quality of the workpiece. There are many factors that cause machining deviation, such as the distribution of stress in the workpiece (INNER STRESS), the installation and clamping of the workpiece, the complexity of the workpiece structure, the degree of tool deformation, the accuracy of the machine tool, the stiffness and thermal characteristics, the deformation of the workpiece, and the heat of the workpiece. Deformation, etc.
For example, in the case of high-speed, high-efficiency and high-precision machining of aircraft components to achieve a thin-walled monolithic structure, in order to avoid machining deviations, the most important thing is to ensure low cutting force, low thermal deviation, and higher material movement rate. Applying the corresponding milling force to the stiffness of the part is also a key issue to be aware of during machining.
In summary, China's manufacturing industry is facing a huge market demand, while low labor costs, low productivity levels, and continuous technological advancement have brought us opportunities and challenges. It is undeniable that high quality, high efficiency, low cost and environmental protection are all trends in modern manufacturing. At the same time, increasing production efficiency means more economic considerations. To achieve modern manufacturing, you need to work hard on both hardware and software, including investing in advanced machine tools, CNC machining, advanced tools, optimization of cutting parameters, cooling and lubrication conditions.
Figure 5: FEM analysis results (sidewall deformation after machining, etc.)
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