On this type of machine tool, the workpiece can be automatically changed by the CNC system after the workpiece is mounted once, and the machining surfaces of the workpiece are automatically and continuously processed. It improves equipment utilization and labor productivity, and its average cutting efficiency is about Ω times higher than that of general-purpose machine tools. Moreover, due to the concentration and automatic processing of the process, human error is avoided, the processing quality is improved, the inventory is reduced, and the amount is further shortened. The trial cycle of new products. Therefore, it is suitable for factories with frequent product replacement, complex parts, high precision and short production cycle.
There is a fundamental difference in quality assurance between CNC and transmission control methods. Traditional machining is the inspection of the after-sales or semi-finished products in the process. The accuracy of the process is checked after each process is completed. The equipment of the numerical control equipment servo processing is equipped with measuring components, and the closed-loop or semi-closed-loop control method is used to compare the actual machining value and the command value, and the difference is controlled until the difference is eliminated. . Alternatively, the actual position processing value can be estimated by the relevant equipment and compared with the command value, and the difference is used for control.
Nowadays, the large-scale CNC machine tools also adopt the hybrid control mode to achieve high feed and return speed and high. From the above three aspects, CNC brings mechanical control to realize automatic control during the whole process of machining. This leap is not only reflected in various efficiency indicators, but the most important thing is to change the traditional machining thinking, and to change the mode of machining, and to develop the goal of flexibility and integration. Conceptually understood by CNC is a system that deciphers a set of pre-recorded instructions in a symbolic form that enables the controlled device to execute these instructions and then monitor the results of the execution to ensure the required accuracy and functionality. The original design was just to consider how to increase automation on a single device.
However, the supply of blanks, the transportation of semi-finished products, the preparation and deployment of tools, the arrangement of production plans, the storage, inspection and assembly of semi-finished parts of parts must be completed manually, which affects the utilization of numerical control equipment and the flexibility of the production process. A new system with greater adaptability, higher productivity, adjustable processing range and greater flexibility. A management system having the flexibility of organizing the above subsystems to achieve automatic control of the control process. The introduction of this concept is a new revolution in numerical control technology, which has the effect of increasing productivity and expanding processing flexibility.
It solves the automation of single-piece small-volume production, combines and unifies high flexibility, high quality and high efficiency, and has strong vitality. It is the most effective production method in current machining, and gradually moves to medium and large batches and varieties. The automation of production has enabled CNC technology to further penetrate into the entire process of mechanical manufacturing. New CNC technology? The computer numerical control system has established the concept of the whole process of mechanical manufacturing, but also includes production management and monitoring, material management and planning progress.
From the point of view of automation, CNC machine tool processing is a process automation, the machining center is to realize part or all of the machining process automation, computer direct control and flexible manufacturing system is the automated manufacturing process to complete a family of parts or different family parts, and the computer Auxiliary manufacturing is a general concept of a computer that is fully integrated into the manufacturing process. In order to preserve these original basis, it also takes up a large number of warehouses, and the manufacturing cycle is long, and it is not easy to update the varieties.
Improve system reliability and features. The CNC system forms an information chain and is similar to the general information transmission closed loop process. Shown is a simplified diagram of one of the most important CNC system units. Many CNC systems contain sensing devices that return the actual state of the machine to the control unit. It is this feedback that allows the controller to check that the machine's work is consistent with the input symbolic instructions. From the perspective of integrated information network, the modern integrated manufacturing system regards the production process as an inseparable whole from the perspective of system, and then decomposes the manufacturing process into the process of information collection, processing and transmission from the perspective of informationization.
In the field of mechanical manufacturing, CNC technology has become a part of the manufacturing process from the beginning to the full penetration, and has played a major role in the development of computer-aided manufacturing, which has deepened the concept of mechanical manufacturing. With the improvement of the national industrialization level, the application of numerical control equipment in machinery, electronics and other industries will become more and more extensive. CNC technology will also develop into a basic technology and expand into various industries to obtain specific applications and achieve the best technical and economic effects. It is firmly believed that this represents the direction of the development of modern science and technology in the machinery manufacturing industry and will play a greater role in future research and production.
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