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三自由度氣動機械手搬運系統(tǒng)的設計附件2：外文原文
On the Development Trend of
Numerical Control Technology
Abstract: With the rapid development of the computer industry, this technology has also undergone a fundamental change is the application areas in recent years developed very rapidly in a comprehensive high-tech, the article at home and abroad, analyzes the development of numerical control technology trend.
Keywords: CNC Technology Trends Smart
CNC technology is a set of computer technology, automation and control technology, measurement technology, modern machinery manufacturing technology, microelectronics, information processing technology, an integrated multi-disciplinary cross-technology, application areas in recent years developed very rapidly in a comprehensive high-tech. It is to meet the high-precision, high speed, complex parts processing and there is automatic, digital, flexible, information-oriented, integrated, network-based foundation, the soul of modern machine tools and equipment and the core, has a wide range of application fields and broad application prospects.
1, numerical control technology and equipment development trends and countermeasures
????The equipment industry's technical level and degree of modernization of the entire national economy determines the level and degree of modernization, numerical control technology and equipment is the development of new high-tech industry and cutting-edge industries (such as information technology and its industry, biotechnology and its industry, aviation, aerospace, etc. defense industry industries) enabling technology and basic equipment. Marx once said, "the difference between the various economic era, is not what is produced, but rather how to produce, what the production of labor." Manufacturing technology and equipment is the most basic of human means of production activities, while the numerical control technology is today's most advanced manufacturing technology and equipment, the core technology. Widely adopted by nations in the world manufacturing numerical control technology to improve manufacturing capacity and level, to improve the dynamic changing market adaptability and competitiveness. In addition, all industrial countries in the world and CNC numerical control technology and equipment will also be listed as a national strategic goods, not only to take significant steps to develop its own CNC technology and its industry, but also in the "sophisticated" numerical key technologies and equipment to China imposition of closures and restrictions. In short, the vigorous development of numerical control technology as the core of advanced manufacturing technology has become the world's developed countries to accelerate economic development, enhance overall national strength and an important way to statehood.
????CNC technology is to use digital information on the mechanical movement and the work process control technology, CNC numerical control technology and equipment is represented by new technologies on traditional manufacturing industries and the penetration of the formation of new manufacturing electromechanical integrated product, so-called digital equipment , and its technology, covering many areas: (1) Mechanical manufacturing technology; (2) information processing, processing and transmission technology; (3) automatic control technology; (4) servo drive technology; (5) sensor technology; (6) software technology.
Second, the development of numerical control system at home and abroad overview
With the rapid development of computer technology, the traditional manufacturing industries began a fundamental change, the industrialized countries invested heavily in modern manufacturing technology research and development and put forward a new manufacturing model. In modern manufacturing systems, numerical control technology is the key technology, which combines micro-electronics, computer, information processing, automatic detection, automatic control and other high-tech in one, with high precision, high efficiency, flexibility and automation features to achieve flexible manufacturing automation, integrated, intelligent play a decisive role. At present, the numerical control technology is undergoing a fundamental transformation, from special-purpose closed-open-loop control mode to the general-purpose real-time dynamic open-loop control mode. In an integrated basis, numerical control system to realize ultra-thin, ultra-small; in based on intelligent, integrated computers, multimedia, fuzzy control, neural networks, multi-disciplinary technical, numerical control system to realize high-speed, high-precision, efficient control of during processing can automatically correct, regulation and compensation of various parameters to achieve an online intelligent fault diagnosis and treatment.
For a long time, China's numerical control system for the traditional closed architecture, CNC machine tool only as a non-intelligent motion controller. Machining process variables based on experience in advance the form of a fixed parameter setting, the actual processing of pre-processing by hand or through a CAD / CAM and automated programming systems to prepare. CAD / CAM and CNC is no feedback between the control link, the entire manufacturing process, CNC is a closed-door open-loop enforcement agency. In a complex environment and the changeable conditions, the combination of processing tool, workpiece material, spindle speed, feed rate, tool path, cutting depth, step length, machining allowance, and other processing parameters can not be in the field environment, under the external disturbances and random factors, real-time dynamic adjustment of feedback control can not be more random links to amend CAD / CAM in the set amount, thus affecting the working efficiency and product CNC machining quality. Thus, the traditional CNC system, such a fixed process control mode and closed architecture, limited to the multi-variable intelligent control of CNC development, has not suited to the increasingly complex manufacturing process, therefore, to develop numerical control technology as the core of the advanced manufacturing technology has become our country to accelerate economic development, enhance overall national strength and an important way to statehood.
Third, the development trend of numerical control technology
The application of CNC technology to traditional manufacturing industry is not only a revolutionary change in the manufacturing industry to become a symbol of industrialization, and with the numerical control technology, continuous development and expansion of application fields, his people's livelihood some of the important development of the industry plays a an increasingly important role. NC from the current world trend of technological development, mainly the following aspects:
????1. High-precision, high-speed development trend
Although more than 10 years ago, the trend appeared in high-precision high-speed, but the scientific and technological development is not enough, high-precision, high-speed is also changing the connotation of being towards the development of accuracy and speed limits.
Efficiency, quality is the main body of advanced manufacturing technology. High-speed, high-finishing technology can greatly improve efficiency, improve product quality and grades, and shorten the production cycle and improve market competitiveness. To this end, Japan will study advanced technologies listed it as one of five major modern manufacturing technology, the International Institute of Production Engineering be identified as the 21st century, one of the central research directions. In the car industry, the production of an annual output of 300,000 beat is 40 seconds / vehicle, and most varieties of processing is a car equipped with one of the key issues that must be addressed; in aviation and aerospace industry, its processing parts are mostly thin-walled and thin bars, stiffness is poor, aluminum or aluminum alloy material, and only at high cutting speed and cutting force in the case of a small can of these ribs, the wall processing. Recently, large single piece aluminum alloy billets, "hollowed out" approach to create the wings, fuselage and other large parts to replace multiple components through a large number of rivets, screws and other connecting means assembly, so that components of the strength, stiffness and reliability. These are made of processing equipment, high speed, high precision and high flexibility requirements.
????2.-Axis simultaneous machining, and rapid development of complex machine tools
5-axis machining of three-dimensional curved surface parts can be used the best tool for cutting geometry, not only finish high, but efficiency is greatly improved. Is generally believed that, 1 5-axis machine tools can equal the efficiency of 2 sets of 3-axis machine tools, particularly the use of cubic boron nitride and other superhard materials, high-speed milling cutter hardened steel components, 5-axis simultaneous machining comparable three-axis process giving a higher efficiency. But in the past due to 5-axis numerical control system, host complex structure and other reasons, its price than the 3-axis CNC machine tools are several times higher, plus the programming more difficult, limiting the development of five-axis machine tools. Present, due to the emergence of spindle, allowing to achieve 5-axis simultaneous machining of composite spindle head structure greatly simplified and its manufacturing difficulties and costs significantly reduced, narrowing the gap between the price of CNC system. Therefore, the promotion of the composite spindle head type five-axis machine tools and complex machining machine tools (including the 5-sided machining, machine tools) development.
3. Intelligent, open, network-based development of contemporary numerical control system the main trends
CNC equipment in the 21st century will be a certain intelligent systems, intelligent content included in the numerical control system in all areas: the pursuit of processing efficiency and processing quality of the intelligence, such as the adaptive control process, process parameters automatically generation; To improve drive performance and the use of intelligent and convenient connections, such as feedforward control, the electrical parameters of the adaptive computing, automatic identification of negative auto-selection model, self-tuning, etc.; to simplify programming and streamline operational aspects of intelligence, such as smart Auto-oriented programming, intelligent man-machine interface, etc.; there are intelligent diagnosis, intelligent control aspects, to facilitate the system diagnosis and maintenance. To address the traditional closed and CNC numerical control system application software industrial production problems.
At present, many countries conduct a study of open CNC system, CNC system and opening up has become a numerical control system of the future path. The so-called open-architecture CNC system is the development of numerical control system can be run in a unified platform for machine tool manufacturers and end users, by changing, adding or cutting the structure object (numerical control function), the formation of serialization, and can be easily user's for special applications and technical know-how into the control system, quick realization of different varieties and different grades of open CNC system, to form a distinctive brand personality. Currently open CNC system architecture specification, communication specifications, configuration specifications, operating platform, CNC system function library and function of numerical control system software development tools is the core of current research. NC network equipment is well-known international machine tool fair the past two years a new bright spot. NC network equipment will greatly satisfy the production lines, manufacturing systems, manufacturing information integration needs of enterprises, but also to achieve new manufacturing paradigms such as agile manufacturing, virtual enterprises, global manufacturing base unit. Some well-known at home and abroad CNC machine tools and CNC manufacturing companies are launched in the last two years, the related new concepts and prototypes, reflecting the NC machine to the network in the direction of the trend.
IV Conclusion
As people focus on the numerical control technology, its development more and more rapidly. This paper briefly presented the current development trend, additional numerical techniques are steadily becoming integrated, parallel, there are still vast room for development.
References:
[1] Wang Lixin. On the numerical control technology, the development trend of [J]. Chifeng College, 2007.
[2] DONG Chun. Numerical control system of the new trends in technology development [J]. Programmable controllers and factory automation, 2006.
[3] Ya-Li. Outlined the development of a new trend of NC [J]. Land and Resources of Higher Vocational Education Research, 2005.
[4] Fang. CNC technology development and means of [J]. Science and Technology Information, 2008.
三自由度氣動機械手搬運系統(tǒng)的設計
目 錄
目 錄 I
摘 要 IV
Abstract V
第一章 前言 1
1.1 研究的目的及意義 1
1.2 機械手在國內外現(xiàn)狀和發(fā)展趨勢 1
1.3 主要研究的內容 2
1.4 解決的關鍵問題 3
第二章 執(zhí)行系統(tǒng)的分析與選擇 4
2.1 執(zhí)行機構坐標形式的選擇 4
2.2 執(zhí)行機構的組成 6
2.3 執(zhí)行機構各部分的分析與選擇 6
2.3.1 手部的選擇 6
2.3.2 手臂結構的選擇 8
2.3.3 機座結構的選擇 9
2.4 執(zhí)行機構的工作原理 10
2.5 執(zhí)行機構簡圖 10
第三章 驅動系統(tǒng)的分析與選擇 12
3.1 驅動系統(tǒng)的分析與選擇 12
3.2 機械手驅動系統(tǒng)的控制設計 13
3.3 氣動元件選取及工作原理 14
3.3.1 氣源裝置 14
3.3.2 執(zhí)行元件 15
3.3.3 控制元件 16
3.3.4 輔助元件 17
3.3.5 真空發(fā)生器 18
3.3.6 吸盤 18
3.4 氣動回路的工作原理 18
第四章 控制系統(tǒng)的分析設計 22
4.1 控制系統(tǒng)的組成結構 22
4.2 控制系統(tǒng)的性能要求 22
4.3 傳感器的選擇 23
4.3.1 位置檢測裝置 23
4.3.2 滑覺傳感器 23
4.3.3 視覺傳感器 24
4.4 控制系統(tǒng)PLC的選型及控制原理 25
4.4.1 PLC控制系統(tǒng)設計的基本原則 25
4.4.2 PLC種類及型號選擇 30
4.4.3 I/O點數分配 30
4.4.4 PLC外部接線圖 32
4.4.5 機械手控制原理 32
4.5 PLC程序設計 34
4.5.1 總體程序框圖 34
4.5.2 初始化及報警程序 36
4.5.3 手動控制程序 37
4.5.4 自動控制程序 39
第五章 總結與展望 42
參考文獻 43
致 謝 44
附 錄 45
摘 要
機械手在先進制造領域中扮演著極其重要的角色。它可以搬運貨物、分揀物品、代替人的繁重勞動?？梢詫崿F(xiàn)生產的機械化和自動化，能在有害環(huán)境下操作以保護人身安全，因此被廣泛應用于機械制造、冶金、電子、輕工和原子能等部門。
本文在縱觀了近年來機械手發(fā)展狀況的基礎上，結合機械手方面的設計，對機械手技術進行了系統(tǒng)的分析，提出了用氣動驅動和PLC控制的設計方案。采用整體化的設計思想，充分考慮了軟、硬件各自的特點并進行互補優(yōu)化。對物料分揀機械手的整體結構、執(zhí)行結構、驅動系統(tǒng)和控制系統(tǒng)進行了分析和設計。在其驅動系統(tǒng)中采用氣動驅動，控制系統(tǒng)中選擇PLC的控制單元來完成系統(tǒng)功能的初始化、機械手的移動、故障報警等功能。最后提出了一種簡單、易于實現(xiàn)、理論意義明確的控制策略。
通過以上部分的工作，得出了經濟型、實用型、高可靠型物料分揀機械手的設計方案，對其他經濟型PLC控制系統(tǒng)的設計也有一定的借鑒價值。
關鍵詞: 機械手，氣動控制，可編程控制器（PLC），自動化控制，物料分揀。
Abstract
Manipulator plays an extremely important role in the field of advanced manufacturing. It can carry goods, sort materials and do heavy works instead of the human being. It also can realize mechanization and automation of the production, do the jobs in harmful environment to protect the personal safety. So it is widely used in metallurgy, machinery manufacturing, electronics, light industry and atomic energy etc.
In this paper,by reviewing the developmental status of the manipulator in recent years, combining the design of manipulator and systematic analyzing technology of the manipulator, We proposed the design scheme that the manipulator was driven by the pneumatic and the system was controlled by PLC. Integrative idea was adopted in this design to fully consider the characteristics of the software and hardware and complementary optimization. We analyzed and designed the overall structure, the implementation of structural, driving system and control system of the manipulator. We used pneumatic-driven in the driving system, PLC control unit in the control system to complete initialization of the system, manipulator's moving, failure alarm and so on. Finally we put forward a control strategy which is simple, easy to realize, and clear theoretical significance.
Through the work above, a practical, economical, high-reliability sorting material manipulator was designed, which also had certain reference value for the other types of economical PLC control system design.
Key words: manipulator ；pneumatic-driven； programmable logic controller (PLC)； automatic control；sorting materials