The Evolution and Transformative Power of Computer Numerical Control (CNC) Technology in the Machine Tool Industry
In the late 1970s and early 1980s, the military and civilian machine industries in developed countries began to adopt large-scale CNC machine tools, marking a significant turning point in the history of manufacturing. The essence of CNC technology lies in the utilization of information technology to transform traditional industries, including the application of computer-aided design (CAD), computer-aided engineering (CAE), computer-aided manufacturing (CAM), virtual manufacturing, and management information systems (MIS), as well as the integration of artificial intelligence (AI) in product development.
The widespread adoption of CNC technology has led to significant improvements in product quality, increased efficiency, and enhanced competitiveness in international markets. For instance, Japan’s CNC rate reached 20.8% in 1994, while in our country, the CNC rate was only 1.9% in 1995. This disparity has resulted in a significant imbalance in trade, with a large number of mechanical and electrical products being imported each year.
To stay competitive, it is essential for industries to upgrade their traditional machine tools to CNC machines. The advantages of CNC machine tools over traditional machine tools are numerous. Firstly, CNC machine tools can process complex parts, such as curves and surfaces, that cannot be treated by traditional machine tools. Secondly, they can achieve machining automation, which enables flexibility and increased efficiency, producing parts three to seven times faster than traditional machine tools. Thirdly, CNC machine tools can achieve high precision and small dispersion, making assembly easier and eliminating the need for "rework." Fourthly, they can concentrate multiple processes, reducing the frequent handling of parts between machine tools. Fifthly, they possess various self-discipline functions, such as automatic alarming, automatic monitoring, and automatic compensation, ensuring long-term reliability.
Despite these advantages, the CNC rate in our country remains low, with only 113,400 CNC machine tools out of a total of 3.8 million machine tools. To rectify this situation, it is crucial to promote the development of CNC technology and increase the competitiveness of domestic products.
The Future of CNC Machine Tools: A Vehicle for Reconstruction and Revitalization
The machine tool processing industry is no longer a simple manufacturing process, but a vehicle for reconstruction and revitalization. The proliferation of CNC technology has created new opportunities for technological transformation, upgrade, and innovation. On the one hand, this has led to the development of a new industry, which is based on CNC technology and has become a "golden age" for the machine tool processing industry in developed countries such as the United States, Japan, and Germany.
On the other hand, this has also led to the need for a massive transformation and upgrade of existing machine tools and production lines. the United States, Japan, and Germany have already set up a large-scale industry for the transformation of machine tools (refurbishment) or machine tool modification (changing machine tools), which has created a new market and a new industry for the repair, update, and renovation of machine tools.
The Main Content of CNC Transformation of Machine Tools and Production Lines
There are four main aspects of CNC transformation of machine tools and production lines:
- Restore the original function, diagnose, and restore the defective parts of machine tools and production lines.
- Add digital display devices or add CNC systems to ordinary machine tools and transform them into NC machine tools or CNC machine tools.
- Renovation. The CNC system should be updated and renovated, adding new technologies and processes, and improving performance, notes, or functionality.
- Technological update or innovation, carried out on the basis of the original, to significantly improve quality, level, and grade.
There are three main types of CNC systems: open-loop systems, closed-loop systems, and semi-closed-loop systems.
- Open-loop system: This system does not require the actual position and speed of the input to be restored, and the movement accuracy is relatively low. It is simple in structure, easy to debug and repair, reliable, and low-cost.
- Closed-loop system: This system compares the actual position feedback signal measured by position detection devices to the given value at any time, amplifies and transforms it, and trains the actuator. It is structurally complex, with higher accuracy, faster speed, and greater driving power than open-loop systems.
- Semi-closed-loop system: This system mounts the detection element on the intermediate transmission to indirectly measure the position of the execution component, achieving limited accuracy and precision. Its structure and debugging are simpler than those of the closed-loop system.
In conclusion, the CNC technology holds immense potential for transforming the machine tool industry, enabling the repair, update, and renovation of existing machine tools and production lines. This not only resolves the problem of outdated equipment and slow production capacity but also increases the competitiveness of domestic products, driving industries forward, and creating new opportunities for economic and social development.
