Some questions about purchasing imported CNC machine tools

When selecting manufacturers and brands, it's essential to consider their market share both domestically and internationally, as well as their recent sales performance, operational status, and financial health. Additionally, evaluating their service capabilities—especially remote support—is crucial to mitigate the risk of factory failure. For example, in 1995, a company purchased a floor-standing CNC boring and milling machine from a Spanish firm, only for the company to shut down before the machine was even installed. To reduce such risks, it’s advisable to choose more than three manufacturers and conduct thorough research on product performance, accuracy, specifications, and pricing. Beyond traditional methods like user surveys, manufacturer exchanges, and site visits, it’s also important to attend authoritative international machine tool exhibitions held in China, such as CIMT. Leveraging the role of domestic and foreign authorities, as well as neutral market intermediaries, can provide additional insights. Utilizing internet resources is also beneficial. In open tendering, preparing bids is critical. The main technical indicators should follow the principle of “fair, reasonable, and advanced.” Fairness ensures non-discrimination and protects the selection of the best or better equipment, which ultimately benefits the organization. It also serves as a prerequisite for passing national tender reviews. Reasonableness avoids over-indexing, which could lead to waste or discourage high-quality manufacturers. Excessively high standards may reflect blind pursuit of advancement and lack of proper process analysis. Advanced features help avoid low-cost, low-quality options that fail to meet performance expectations. Regarding pricing, with the industrialization of CNC machine tools in developed regions and global price reductions, international CNC machine tool prices have dropped by about 50% over the past decade. Some believe that lower prices are now an international trend. However, similar machines can have significantly different prices due to production volume differences. A manufacturer producing only dozens of units annually will face higher costs for parts compared to one producing over a thousand units. Since purchased parts account for roughly half the total cost, the phrase “cheap and good” becomes relevant. It’s important to investigate fair international prices and avoid fraud. Pay attention to the performance-to-price ratio, choosing equipment that offers excellent performance at a reasonable cost, while avoiding low-price traps. When selecting positioning accuracy standards, four internationally recognized ones are ISO, JIS, ASME, and VDI (International, Japan, United States, and Germany). There are also Chinese GB and British BS standards. While most use statistical methods for multi-point measurements, JIS measures only once, resulting in lower accuracy values. For instance, a machining center from HELLER shows positioning accuracy of ±4 μm under JIS and ±14 μm under VDI. Repeatability is ±2 μm vs. ±10 μm. Similarly, BOSTON DIGITAL provides data comparing ISO and JIS standards, highlighting significant differences in accuracy metrics. Always be cautious about factory-provided precision and verify independently. When choosing CNC systems, they have evolved through two stages and six generations. From NC (Numerical Control) using tubes, transistors, and small-scale ICs, to modern CNC systems based on PCs, which are currently the sixth generation. These systems benefit from global component development, high integration, reliability, and fast technological upgrades. Features like touchscreens, voice input, networking, and mass storage are easily implemented. PC-based CNC systems offer open platforms with rich software and hardware resources, expanding CNC functionality. Many foreign factories now implement network manufacturing, leveraging these extensions. While FANUC and SIEMENS are popular due to their high market share, domestic PC-based systems are now on par with international counterparts. To ensure equipment remains relevant for the next 10 years, understanding technological trends is vital. For example, when Guangzhou Peugeot Automobile Company dissolved, China sought new partners. Honda noticed China’s flexible engine production line and quickly formed a joint venture. In contrast, another large car joint venture had a rigid production line that couldn’t adapt to engine changes. This highlights the importance of selecting equipment with long-term flexibility and advanced capabilities.

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