At present, China 's machine tool ownership of nearly 700 million units , has become the largest country in the world machine ownership , but the overall level of the machine is still relatively backward, many 1980s extended service before the product is still difficult to meet the precision requirements. According to statistics, more than 10 years of military age accounted for more than 60% of the machine , these machines are likely to face major overhaul to improve in the next 5 to 10 years or even scrapped functional or technical eliminated, thereby forming a considerable scale remanufacturing recyclable potential resources.
NC remanufacturing promising
CNC machine tools as representative of the " workhorses " of digital control technology and precision manufacturing technology crystallization , is a typical representative of advanced manufacturing equipment. In recent years, China-made high-precision machine tools, CNC machine tools and large-scale production despite the rapid growth , but because the machine base is too small a share of the product is still not high .
At the same time , China's machine tool CNC rate is still very low . According to statistics provided by the China Machine Tool Association , from 2000 to 2006 , China's equipment manufacturing plant produced a total of 290,400 units of CNC equipment , exports about 30,000 units , domestic sales of 260,400 units ; imported CNC equipment 22,000 units. 2007 , made CNC machine tools more than 120,000 units. In addition, the update "fifth" period of about 10 million transformation of CNC equipment , plus about 2,000 years ago our CNC equipment to maintain nearly 90,000 units , which estimates that China's current CNC equipment to maintain about 700,000 units.
At present, the overall rate of CNC machine tools showed an increasing trend year by year , according to statistics , China's CNC rate from 3.2% in 1992 to 2005 of 13.3% increment . However, compared with developed countries, CNC production rate of 60 % to 70% in Japan , the U.S., Germany, and the value of NC rate of 80 % to 90% of China's CNC machine tool equipment rate levels also seem too low.
Since the 1960s , many of our major projects and made a large number of imports of large, heavy equipment. Mechanical parts of these machines after years of use and maintenance , good stability. NC transformation for heavy , large-scale transformation of the machine , saving more money , especially meaningful .
Since the reform and opening up, China imported a large number of CNC machine tools. Currently, most of the machines has spent 10 to 30 years , and the precision of its mechanical body remain intact , the electrical part of the CNC system is aging and in urgent need of reform .
The foreign spare parts has been discontinued , it is difficult to buy . If all of the CNC system transformed into new foreign systems are very expensive , even transformed , because foreign CNC system replacement soon , perhaps after 10 years should not take 10 years of renovation .
In addition , since the 1980s , China produced a large number of stepper motor control Economical CNC machine tools, due to the low precision stepper system , lost step , the system is not reliable , a lot of these machines are now lying nest , in need of rehabilitation .
For general machine tools and CNC machine tools for aging NC remanufacturing , not only can be achieved with the purchase of a new machine the same effect: improve the machining quality and productivity , shorten the manufacturing cycle , improve the working environment ; but also can reduce capital investment, and purchasing compared to the new machine , you can save more than 50 % of the funds . As an economical CNC machine prices remanufacturing same features of the new CNC machine is only 1/5 to 1 /3.
In short , in the current economic situation, CNC machine tool remanufacturing stage has a very important significance in our country , can greatly reduce equipment investment , at little cost to obtain the performance of advanced CNC machine tools, improve processing efficiency and quality ; may to enhance the performance of existing enterprise tools to effectively improve manufacturing capacity. Meanwhile, the new machine will be formed again in our manufacturing and service industries, has important economic , social and environmental benefits.
CNC system ushered opportunities
The main content of a specific CNC machine remanufacturing mechanical and electrical engineering , including the transformation of two aspects, mainly: Select the precision machine tools to restore and enhance recovery and improve the movement precision CNC system and servo systems , auxiliary select the device , as well as aspects of machine commissioning , machine testing and so on. Among them, the selection and use of numerical control system and servo system is a key benefit of the direct impact of the project . Several tools are outlined NC remanufacturing as follows:
An increase recovery and improve the accuracy of military age were randomly bed of mechanical transmission parts , machine tools mechanical transmission components, such as rails, screws , bearings and others have varying degrees of wear. Therefore , the machine remanufacturing process priority is similar to the usual tools machine tools overhaul to restore the machine precision , reach new machine manufacturing standards , so the machine can be combined with CNC machine remanufacturing for overhaul , but the machine CNC machine tool accuracy requirements and general overhaul of the machine there is a difference , that is to restore and improve the overall machine precision mechanical transmission parts , all to meet the structural characteristics of CNC machine tools and CNC automatic machining requirements , and should with batch overhaul characteristics.
Second, selected according to the CNC system and servo system should be re-manufacturing of CNC machine control requirements, select the appropriate numerical control system is critical, directly determines the success or failure of CNC machine tool remanufacturing . Because the entire CNC machine CNC system command center , in addition to considering the features selected to meet the requirements , but also must ensure that the system reliability. Generally cost-effective to select and give due consideration to service and breakdown maintenance and other relevant circumstances . Such as the use of domestic , high-end CNC system will operate in the future , programming, maintenance and so bring greater convenience. Select the servo drive system , but also by the re-manufacturing of CNC machine tool performance requirements of the decision . The use of the same company supporting the supply of CNC system and servo drive systems , remanufactured product quality and maintenance easier guaranteed.
Third, select assistive devices in CNC machine tool CNC remanufacturing process to select an auxiliary device according to the machine control functions. If the selected square or hexagonal turret electric transducer to achieve automatic conversion tool , knife -digit selection process is mainly based on the requirements of the workpiece decision . As most of the CNC machine auxiliary device is currently in the country has a lot of manufacturers supporting the supply, so you can select the product manual for installation at their respective positions on the machine , adjust .
Fourth, the cabinet design and production due to the general functional requirements of the machine electrical control and CNC machine tool is not the same . So when the old machine tools for CNC machine tools remanufacturing , electrical control part of the original machine is generally only be scrapped and re- press the NC remanufacturing requirements for design. Strong electrical control circuit design part , mainly based on numerical control system input , output interface functions and control requirements to proceed. Strong electric CNC machine control part of the design should pay special attention to the characteristics and form of numerical control system interface signals to each match and in the design process should be simplified strong electric control lines.
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