Precision machining and ultra-precision machining are still in development, and have the following characteristics:
Closely connected with product demand
Precision machining and ultra-precision machining have high requirements on processing quality, difficulty in technical business, wide coverage, and many influencing factors. The investment is often large, so the development of precision machining and interesting precision machining is closely related to the specific process. Product demand is closely related. For example, the DTM_3 ultra-precision diamond lathe jointly developed in 1989 by the KawrenceLivemor laboratory at the University of California and the Y-12 factory in 1989 is the reflection of Zhao on the processing of laser nuclear fusion. Mirror, the antenna of the human-shaped celestial single-lens, etc., reflect the needs of the dog technology. The development of precision machining and ultra-precision machining technology is also combined with the specific needs of aerospace and aviation technology. At present, the standardization and serialization of precision machine tools and ultra-precision machine tools are far less than that of Qutong machine tools. There are not enough varieties. The main reason is that the promotion of technology is not enough. The versatility is not strong. The expansion of product quality, the continuous maturity of precision machining technology, and the generalization and serialization of precision machining and ultra-precision machining equipment will definitely be more widely used in production practice.
Formed a system engineering
Precision machining and ultra-precision parts processing is a multi-disciplinary comprehensive advanced technology. To achieve high precision and high surface quality, not only the processing method itself, but also the material to be processed, processing equipment and engineering equipment, testing methods, etc. must be considered. The working environment and the skill level of the people are just right here. The isolated processing method cannot achieve the predetermined effect. It must be supported by comprehensive technology and conditions, thus forming the precision processing system engineering. The combination of precision machining technology and system theory, method, computer technology, information technology, sensor technology, and digital control technology has contributed to the formation of precision machining systems engineering. , Build the number of tuns. #Model at the same time. Also study various related technologies.
Closely connected with special processing AI department
Special machining refers to the non-traditional processing method that uses mechanical, optical, electrical, sound, heat, chemical, magnetic, raw f and other energy sources to add T. It has developed rapidly in recent years. Composite machining methods can be used, and the machining accuracy and surface quality of very precise machining and ultra-precision machining are very high. Therefore, there must be corresponding testing methods to show whether the technical requirements are met. Therefore, in precision machining and ultra-precision machining, both machining and inspection are difficult, and inspection is often more difficult. Only by adopting a strategy of integrating machining and inspection, inspection is considered at the same time as machining.
From the time domain analysis of the detection process, detection can be divided into three categories: offline detection, in-situ detection and online detection. After the off-line detection of toe and finger addition is completed, it will be tested in the testing room. Therefore, processing and inspection are separated. If the inspection fails, due to the high machining accuracy, it is generally difficult to repair. In-situ inspection means that after the machining is completed, the workpiece is not removed, and the inspection is carried out on the machine tool. For example, the eyelid measurement is small. If it is qualified, it will be repaired in time. There will not be errors caused by re-clamping during repair, but the influence of offline inspection and in-situ inspection on the inspection results due to the difference of the inspection environment should be considered. On-line detection_Real-time detection during the process of adding location and Qiao. It is a dynamic measurement process to keep abreast of the addition value and its development trend, and to control it in real time.
Error compensation is an effective technical measure to improve the precision of machining machinery, which can be divided into two categories: static error compensation and dynamic error compensation. Static drop compensation is mainly used to compensate system errors in the process system, such as error correction rulers. Dynamic error compensation is real-time compensation in the processing process, which can compensate for random errors and systematic errors in the Dingyi system. Dynamic error compensation and on-line measurement are closely related.
Numerical control technology, calculation technology, sensor technology, and the development of micro-displacement mechanism. In precision engineering, measurement and error compensation are important measures for the integration of processing and testing.
Closely connected with automation technology
Manufacturing automation is an important part of advanced manufacturing technology. Its function is not only to improve efficiency, improve labor productivity, and improve the working environment and labor conditions of workers, but also to improve the accuracy and surface quality of processing T, and avoid human errors caused by manual operations. , Guarantee plus doubts and the stability of the reed must take measures. At the same time, it is also a powerful measure to quickly respond to market demand and shorten the manufacturing period. To achieve high quality precision processing and ultra-precision machining, automation technology must be relied on to ensure processing technology optimization and adaptation control, detection and error. Compensation and praise: Machine control and other technologies are all automation technologies that improve and ensure the best processing quality
Although the quality of precision machining and ultra-precision machining is still guaranteed by the craftsmanship at present. Processing methods such as grinding and scraping still rely on manual work. However, from the perspective of the development trend, the proportion of automation technology replacing manual work is increasing. The processing effect is also getting better and better.
Closely related to micromachining
Micromachining and ultra-micromachining refer to the first production plus r technology for manufacturing micro-size parts and ultra-micro-size parts. Micromachining plus and ultra-micromachining. The emergence and development of the integrated circuit is closely related to the integrated circuit, which requires the fabrication of many components in a tiny area of semiconductor material chips to form circuits with various complex functions. Therefore, the number of unit logic circuits, the number of electronic components on the unit chip and the minimum line width of the unit chip E are the signs of the integration degree of the integrated circuit. At the same time, it also indicates the difficulty and level of its manufacturing.
The concept and mechanism of micromachined plus t and general size plus t are different. When the general size is added, the accuracy is expressed in the tolerance unit. Tolerance = tolerance level factor × tolerance unit, the same precision is equal to the tolerance level factor .But the tolerance unit varies with the size of the basic size, the larger the basic size. The larger the tolerance unit is, the different formulas are calculated according to the segmented range of the basic size. When adding T, the precision is expressed by the absolute value of the size due to the small processing size. From the point of view of the piece , General plus T and micro plus] The biggest difference between the two is that the size (thickness) of the chips is different. When finely added, the amount of back cutting is extremely small. The cutting is carried out inside the crystal of the material. The amount of cutting removal is embedded in the “machining unit size” or “machining unit”, and the size of the “machining unit” represents the machining accuracy Level. Such as graded processing, atomic processing.
Although micromachining and general size plus Ij are different in concept and mechanism, from the point of view of plusing technology, micromachining is mainly enough to process small R inches. It also processes small sizes, so micromachining belongs to the category of precision plus r and ultra-precision machining. In fact, many of the processing methods of the two are the same, and the surname is the processing object.