At present, the use of machining centers is increasing. In order to meet the needs of production, in addition to the purchase of new equipment, a large number of old machine tools, especially imported CNC machine tools, precision machine tools and used equipment can be transformed and upgraded, and these devices continue to perform with less investment. At present, the use of machining centers is increasing. In order to meet the needs of production, in addition to the purchase of new equipment, a large number of old machine tools, especially imported CNC machine tools, precision machine tools and used equipment can be transformed and upgraded, and these devices continue to perform with less investment. In 2000, our company introduced five old Japanese CNC machine tools, including four three-axis vertical machining centers and one horizontal working center for exchangeable workbench. Through transformation, it has been effective for more than two years.
First, the content and advantages and disadvantages of CNC transformation 1. Restore the original function. Diagnose and recover the faulty part of the machine tool.
2. NC. Add CNC system to the ordinary machine tool and transform it into CNC machine tool.
3. Refurbished. In order to improve the accuracy, efficiency and automation, the mechanical and electrical parts are refurbished, the mechanical parts are reassembled and processed, the original precision is restored, and the CNC system that cannot meet the production requirements is updated.
4. Technology update or technological innovation. In order to improve performance, grade and use of new processes and new technologies, large-scale technical updates or innovations are carried out on the basis of the original.
Hardware machinery mold network Jinjitong tips its advantages and disadvantages are as follows: (1) reduce investment, generally can save more than half of the cost. (2) The transformation time is short. (3) The performance is more stable. (4) The design risk is small. (5) The user's wishes can be more fully reflected. (6) is more conducive to use and maintenance. (7) The mechanical properties are stable and reliable, and the structure is limited. The basic parts such as the bed column used are heavy and solid casting members. The modified machine tool has high performance and good quality and can be used as a new equipment for many years. Due to the limitations of the original machine structure, it is not advisable to make breakthrough innovations. (8) Adopt the latest control technology. According to the development speed of technological innovation, the automation level and efficiency of production equipment can be improved, the quality and grade of equipment can be improved, and the old machine tools can be transformed into the current level of machine tools.
Second, the choice of CNC system should choose the CNC system should pay attention to, first, try to close to the model series of famous manufacturers, not only can guarantee the quality of the CNC system, but also help the maintenance, management and spare parts procurement; Second, we must clearly identify the selected manufacturers in China. The maintenance condition is exempted from the aftermath. After the CNC system is selected, it is decided whether to replace the drive system according to the actual condition of the machine. Jinjitong prompts that if it is not replaced, it must be confirmed that the original drive system can match the new CNC system. At present, the numerical control system requires the measuring system to be an incremental pulse encoder, so the measuring elements such as the inductive synchronizer or the resolver of the old machine tool need to be replaced by an incremental pulse encoder and a grating scale.
Third, the determination of peripheral circuits There are two options for the transformation of peripheral circuits. One is the interface type transformation, that is, the peripheral relay circuit is retained, only the NC and PLC are modified, and the debugging workload is small. First, the new PLC can be completely modified. The peripheral circuit is completely modified, which simplifies the hardware circuit and improves the reliability, but the design work of the transformation is large. The five CNC machines that we have modified all adopt the second method.
Fourth, the main steps of the transformation of CNC machine tools Prepare for the renovation. A comprehensive analysis of the technical status of the modified machine tool in terms of structure, performance and precision.
2. Mechanical repairs are generally required for mechanical repairs. To determine the requirements, scope, and content of the repair, it is also necessary to determine the requirements and content of the mechanical structural changes required for the retrofit. The measurement, calculation, design, drawing, and part making of the mechanical modification required to cope with the electrical transformation shall be completed in advance. The parts that need to be dismantled, modified, and processed after the shutdown should also be planned in advance and set forth clear requirements. Good mechanical performance is the basis for the successful electrical transformation.
3. Before the transformation, you should be familiar with the technical materials, so that the ideas are clear and the layers are clear.
4. The removal of the original system must be carried out in accordance with the original drawings and marked in time to prevent omissions or over-disassembly.
5. The new system is reasonably configured according to the design drawings to ensure that the wiring process specifications, wire diameter are appropriate, correct, reliable and beautiful.
6. Commissioning must be carried out in accordance with predetermined steps and requirements. Jinjitong reminds that the debugging staff should be calm and record at any time in order to discover and solve the problem. In the commissioning, first try the safety protection and system sensitivity to prevent personal and equipment accidents.
7. acceptance.
(1) Mechanical performance acceptance. After mechanical repair and modification and comprehensive maintenance, the mechanical properties of the machine tool should meet the requirements, and the geometric accuracy should be within the specified range.
(2) Electrical control function and control accuracy acceptance. Jinjitong reminds that the functions of electrical control must be correct, sensitive and reliable. Control accuracy The function of the application itself (such as step size) is checked against standard measuring instruments (such as laser interferometers, coordinate measuring instruments, etc.) to within the accuracy range. At the same time, it should be compared with the functions and precision of the machine tool before the transformation, and the quantitative index difference can be obtained.
(3) Inspection and acceptance of test pieces. It can refer to the standard of CNC machine tool cutting test pieces at home and abroad, and carry out trial cutting with the cooperation of operation and programming personnel. The cutting of the test piece can verify the machine stiffness, cutting force, noise, motion trajectory, and associated actions.
(4) Drawings and data acceptance. After the transformation of the machine tool, the drawings (schematic diagram, configuration diagram, wiring diagram, ladder diagram and other materials and various manuals) and the transformation archives (various records before and after the transformation) should be summarized, sorted and transferred into the file. The completeness, validity and continuity of the data is important for the stable operation of the equipment in the future. Http://news.chinawj.com.cn Submission:
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