After the CNC system is selected, the user decides to replace or not replace the drive system according to the actual condition of the machine. If it is not replaced, it must be confirmed whether the old drive system and the CNC system can be matched.
For the machine tool measurement system, the current CNC system requirements are incremental pulse code input, so the measurement components such as the inductive synchronous ruler or the resolver used in the old machine tool need to be replaced by incremental pulse encoders and grating scales.
For the peripheral circuit, there are two options for the transformation: "interface type modification", that is, the peripheral relay circuit is reserved, and only the NC and PLC are modified. The new PLC does not participate in the peripheral circuit control, and only processes the command signals required by the NC. The design and commissioning of this scheme is small. The Other is "complete transformation". In the case that the relay logic is more complicated, the failure rate is higher, and the user can provide a clear logic diagram, the PLC can be completely modified by the PLC carried by the new NC, simplifying the peripheral circuit, and Rational use of the control capabilities of the PLC. This solution can greatly simplify the hardware circuit and greatly improve the reliability, but the design and debugging work is large.
(3) The determination of the installation form of each part. The installation of the control system is usually suspended, cabinet type, desktop, etc. The selection of the installation method directly determines the wiring mode and cable length of various connecting cables, and also relates to the convenience of operation and maintenance. Second, the installation of the drive system, in principle, can only be installed in the electrical cabinet. The factors to be considered are ventilation cooling, cable routing and length, interference with other electrical appliances, etc. Third, the installation of the motor, according to the actual machine, determine the installation of the motor: 1 flange type, 2 base type, 3 with base flange type, plus the direction of the shaft extension, the position of the motor junction box, etc. The ordering auxiliary parameters of the motor are determined. Fourth, the installation of the measurement system, such as the choice of the structure of the motor built-in encoder, the motor is installed to determine, it is also determined; the external type requires the need for flexible couplings, mounting clips, cable routing direction and length considerations For the grating scale, the installation problem should be taken seriously. In addition to the installation feasibility, the installation fit of the fixed length and the movable ruler, the installation accuracy, and the temperature influence must be considered.
Third, the implementation of the project
1. Selection of construction team The design of the machine tool is greatly modified. The quality of the result is greatly affected by the large-scale modification. In addition to economic factors, it depends largely on the quality of the construction team. This is a very important task. Companies involved in project construction should have the following conditions.
(1) The key to a complete and efficient technical support system is the human factor. The company should have a team of engineers, including mechanical, electrical, hydraulic, and process tooling, with many years of experience in design, manufacturing, assembly, and commissioning. At the same time, there should be an on-site construction team that can fight hard. This mode of work is a popular mode under the economic conditions of today's market.
(2) The key to the management model under the conditions of market economy is human factors. Abandoning all the organizational forms and management methods in enterprise management under the condition of planned economy, and building an enterprise structure that can respond quickly to market demand, and continuously improve and perfect in the development of market economy, The company's size, funding status and many other factors.
2. The hardware order has been thoroughly considered as above, the construction team has been selected, the details of the technical plan are determined, and the order list can be listed. Users and engineering companies can comprehensively consider the two aspects of cost reduction and reliability assurance in a mutual trust attitude, determine the domestic and international order list, and sign a formal transformation contract. At the same time as the order is made, the engineers can begin to carry out system mechanical overhaul, project repair, electrical software preparation, and laboratory commissioning.
3. On-site commissioning This is the key link for the success of the transformation. At this stage, the engineering personnel complete the machine and electric joint adjustment, the final debugging of the numerical control system, the optimization of the parameters of the drive system, etc., and prepare for the acceptance.
4. Trial processing acceptance usually has two contents: test cutting of standard samples. According to international standards, different types of machine tools have corresponding standard test cutting procedures; machine tool accuracy is verified according to the level of measurement of each factory. Corresponding means, the conditional user can use the laser interferometer to measure, so that the compensation of the machine position measurement system can use the obtained data, thereby improving the accuracy of the machine tool.
5. Data, training and warranty After the acceptance work, technical data needs to be organized, archived and provided to the user, as well as technical training and warranty work for the user.
The numerical control transformation of old machine tools is in the ascendant. Under the current situation in China, a large number of faulty machine tools, especially a large number of imported CNC machine tools, precision machine tools and used equipment will be transformed and upgraded, and these equipments will be economically developed as soon as possible with less investment. Performance and efficiency are indeed a topic that many companies cannot ignore.
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