CNC machine tools have advantages that cannot be matched by ordinary machine tools in terms of machining accuracy, automation, production efficiency, labor intensity, etc. However, the purchase of new CNC machine tools, especially large-scale CNC machine tools, is costly and often causes many users to stand still. In particular, developing countries such as China have limited funds. Therefore, most mechanical factories want to buy and cannot afford CNC machines. How to get a CNC machine tool with less investment is a question worth exploring. Can you buy a new CNC machine and upgrade the original machine to make it a CNC machine?
So how can we achieve the transformation and upgrading of CNC machine tools? The following major issues must be noted.
The need to pay attention to the problem of CNC upgrade:
What kind of machine tool is suitable for CNC upgrading and remanufacturing? Experience has proved that vertical and horizontal lathes (especially large-scale horizontal lathes), gantry milling and upgrading of CNC gantry milling, gantry milling upgrade NC gantry milling, horizontal boring and milling machine upgrade CNC horizontal The transformation effect of boring and milling machines and vertical and horizontal grinders to upgrade CNC grinders is ideal.
The numerical control upgrade must first redesign and remanufacture the mechanical part of the machine tool so that it can meet the requirements of numerical control. Simply adding the servo motor and the CNC system can not achieve the purpose of upgrading. Generally, the following work should be done:
Replace the original trapezoidal screw with the ball screw to improve accuracy and reduce friction; grind and scrape the guide rail and apply plastic or directly use the linear rolling guide; refine the main shaft system to improve the accuracy of the spindle; design automatic cooling chip removal system and improve machine tool automation Degree; when necessary, increase the tool changer-knife robot; design and manufacture of automatic lubrication system.
The CNC system and servo system must be determined and selected during the transformation. The function of the numerical control system is not as good as possible, and the system with more functions is generally more expensive. According to the need to choose domestic systems and import systems. It should be acknowledged that there is still a gap between domestic and imported systems, and it is generally preferable to use large-scale high-precision equipment as the import system. However, domestic systems have made great progress in recent years and can be used reliably for general lathes and milling machines. The servo motor should first select the AC servo motor.
The choice of remanufactured NC upgrade contracting companies is also very important. To choose a certified company, the current remanufacturing industry is still not standardized, and the difference in the company's asking price for the same machine tool varies greatly. Sometimes the difference is as high as 2-3 times; the company’s existing performance should be investigated; Site investigation, those companies that have no fixed site and no stable technical team cannot engage in remanufacturing. A good remanufactured enterprise must have a strong electromechanical design capability and must have certain processing and manufacturing capabilities.
The benefits of CNC transformation
There are at least five major benefits to CNC retrofit: the small amount of investment in CNC transformation and the short delivery time. Compared with the purchase of new machine tools, it is generally possible to save 60% to 80% of the cost, the transformation costs are low. Especially large and special machine tools are particularly noticeable. The transformation of large-scale machine tools generally requires only one-third of the cost of new machine purchases and short delivery times. However, some special circumstances, such as the production and installation of high-speed spindles and tray automatic exchange devices, are too time-consuming and costly, and often the cost of improvement is increased by 2 to 3 times. Compared with the purchase of new machine tools, investment of about 50% can still be saved.
Finally, it is more conducive to use and maintenance. Because users and maintenance personnel can not only directly participate in the formulation of the transformation plan, but also can participate in the entire process of transformation, they can directly obtain various technical information and master the structure and performance characteristics of the machine more deeply, thereby enhancing the active and useability of the use and maintenance. CNC transformation can make full use of the existing conditions. The existing foundations can be fully utilized without the need to rebuild the foundations as with the purchase of new equipment.