Analysis of Technical Features of CNC Machine Tools

What are the technical features of CNC machine tools? CNC machine tools have the advantages that ordinary machine tools cannot match in machining accuracy, automation, production efficiency, labor intensity, etc. However, the cost of purchasing CNC machine tools, especially large-scale CNC machine tools, is very high, often causing many users to stand still, especially Funds for developing countries like China are limited. Therefore, most mechanical factories want to buy but cannot afford CNC machines.

How to get a CNC machine tool with less investment is a question worth exploring. Can you buy a CNC machine and upgrade the original machine to make it a CNC machine? The answer is yes. The experience of upgrading over the past few years tells us that this is highly promising. It not only has good practical performance, has a short cycle, but also can save a lot of money. The bigger the machine that has been modified, the more money it will save. The following is a numerical remanufacturing example conducted by a company:

Transformation of the right knife holder z-axis. Replace the original trapezoidal screw (63×10×3600mm) with the imported Rexroth Ball Screw and remove the light bar drive. Increase the servo motor drive to repair the z-axis guide and scratch the z-axis pressure plate and the insert.

Design and manufacture of electronic control systems for machine tools. FANUC 0it CNC system was selected Fanuc AC digital servo motor selected domestic joint venture low voltage electronic control components design and development of machine control logic diagram.

Finally, the machine tool electromechanical coupling. Debugging the machine tool's x-axis and z-axis. Adjusting the machine's geometric accuracy. Adjusting the machine's coordinate accuracy. Detecting the accuracy of each axis with a dual-frequency laser. Machine auxiliary function debugging and continuous operation of the machine for 36 hours.

After the transformation, the machine tool performance is stable and reliable. After more than one year of production verification, the requirements for the transformation have been achieved. The transformation cost of 1 million yuan is only equivalent to 1/15 of the purchase of CNC machine tools, saving a lot of money for users. The machine tool for the plant to produce hydropower equipment in the volute out of a strong, creating a tens of millions of yuan in output value.

The need to pay attention to the numerical control upgrade, what kind of machine tool suitable for numerical control upgrade and remanufacturing? Experience has proved that vertical and horizontal lathes (especially large horizontal and vertical lathes), gantry milling upgrade NC gantry milling, gantry plane upgrade CNC gantry milling, Horizontal boring and milling machine upgrade NC horizontal boring and milling machines, vertical and horizontal grinders to upgrade the CNC grinding machine transformation effect 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:

Replacing the original trapezoidal screw with a ball screw to improve accuracy, reduce friction and scraping and scratching the guide rails, and applying plastic or directly using a linear rolling guide to refine the main shaft system, improve the accuracy of the spindle design, automatically cool the chip removal system, and improve the degree of machine tool automation 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. At present, 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 first selects the AC servo motor.

The choice of remanufactured NC upgrade contracting companies is also very important. To select qualified companies, the current remanufacturing industry is still not standardized, and the difference in the prices of different companies with the same machine tool varies greatly. Sometimes the difference is as high as 2-3 times the existing performance of the contracted contracting company must be investigated on site by the contracting company. Those companies that do not have a fixed site and do not have a stable technical team cannot make remanufacturing. A good remanufactured enterprise must have a strong electromechanical design capability and must have certain processing and manufacturing capabilities.