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1、Grinding technology development trendGrinding machining is important processing technology in mechanical manufacturing. With precision mechanical products, the requirement of increasing the reliability and service life, high hardness,high strength, high wear resistance,high functional new materials
2、application increased, for grinding processing and put forward many new problems, such as material of grinding machining and surface integrity, super precision grinding and high efficiency grinding and grinding automation, etc. Problems to be solved.At present, the grinding technology is moving towa
3、rd using super hard abrasives, development of precision and ultra precision grinding, high speed, high efficiency grinding technology and the development of high precision, high stiffness of the grinding machine automation direction.One. In-depth development of grinding theory and technology researc
4、hGrinding theory research is the basis for the development of grinding technology, the grinding technology and the development of practice and research provides the opportunity for grinding theory, requirement and new topic, in recent ten years, professionals engaged in the work of grinding, grindin
5、g technology and phenomenon many factors for a lot of in-depth research and achieved fruitful results.Two. Unit grinding machine high speed, high precision components manufacturing technologyHigh precision grinding machine spindle unit, feeding unit, bearing unit and auxiliary unit is the key parts
6、and components. Spindle unit including spindle power, shaft, bearing, and frame sections, she affects the precision of the machining system, stability and application scope, its dynamic performance and stability of high performance precision ultra-precision grinding, play a key role. Feed unit inclu
7、ding the position detection unit, Demand of feed units, therefore, flexible operation, high resolution, high positioning accuracy, not crawl and large movement range, both to have larger acceleration, and large enough thrust, high stiffness, quick dynamic response, high positioning accuracy. Machine
8、 tools supporting technology mainly refers to the supporting member of design and manufacturing technology. Auxiliary unit technology including fast clamping workpiece, high efficiency grinding fluid filtration system, machine safety devices, chip removal and the workpiece cleaning technology, spind
9、le and grinding wheel dynamic balance technology, etc.Three. Grinding automation and intellectualizationWith mechanical manufacturing in FMS (flexible manufacturing system) andCIMS (computer integrated manufacturing system), IMS (intelligent manufacturing system) height automation development direct
10、ion, the grinding automation requirements are put forward. The development of the CNC grinding machine with CNC lathe, milling machine and so on started late. In the 1980 s and 90 s is a CNC grinding machine for rapid development and entered the popularizing period of practical. In recent years, alm
11、ost all kinds of grinder CNC products, CNC tool grinding machine from 3 to 10 shaft axis development. Which can realize online measurement, automatic switching of grinding wheel and the emergence of the automatic unloading workpieces milling machining center, mark CNC grinding reached a new level. G
12、rinding CNC system development also have great progress, many special grinding CNC software and systems have been commercialized. In the 1990 s, Japan announced about intelligent grinding results. Use of monitoring information and database, adaptive optimization in grinding condition and the judgmen
13、t condition of grinding, using computer simulation and virtual technology, establish a realistic virtual grinding environment, to implement the intelligent of the grinding. Continuous track the use of grinding technology, making the grinding technology has made great development.Four. Grinding proce
14、ss monitoring and detection technologyImplementation of intelligent computer control of grinding, grinding process is an important problem in the control room. Solve the grinding process, such as the phenomenon of signal identification, signal sampling, signal processing, feedback and compensation,
15、need high sensitive sensor, also need to have expert system or intelligent system and the software design and other technical support.For grinding wheel wear and tear of using acoustic emission monitoring system. Becauseof the complexity of the grinding process, the grinding process of the monitorin
16、g system in theory and practical aspect still has many problems unsolved. Parts after the grinding size, shape and position accuracy, surface quality of the test is divided into offline and online detection.For super precision grinding and free abrasive machining high precision and low surface rough
17、ness obtained after detection, high-precision grinding on the surface of the on-line automatic detection are much harder than cars, milling, high sensitivity is the key to development of sensor technology and signal acquisition, recognition and processing technologies.Five. Software of grinding tech
18、nologyHigh performance CNC grinding machine should be equipped with a complete software system. Of intelligence information processing and data input of grinding, grinding mode selection and grinding the arrangement of the order, condition of grinding, grinding wheel dressing and grinding automatica
19、lly selected, the state of the grinding process simulation and virtual detection and compensation, are in software design and development of a reasonable solution.All countries in the development of expert system and intelligent system software. Expert system is a branch of artificial intelligence r
20、esearch, and its essence is a kind of application system. Problem solving ability with expert level in the field of grinding process system, can effectively solve complex problems in the field of grinding.磨削加工技術(shù)發(fā)展趨勢(shì)磨削加工是機(jī)械制造中重要的加工工藝。 隨著機(jī)械產(chǎn)品精度、 可靠性和壽命 的要求不斷提高, 高硬度、高強(qiáng)度、高耐磨性、 高功能性的新型材料的應(yīng)用增多, 給磨削加工提出了許多
21、新問題, 諸如材料的磨削加工性及表面完整性、 超精密磨 削、高效磨削和磨削自動(dòng)化等問題亟待解決。 當(dāng)前, 磨削加工技術(shù)正朝著使用超 硬磨料磨具,開發(fā)精密及超精密磨削,高速、高效磨削工藝及研制高精度、高剛 度的自動(dòng)化磨床的方向發(fā)展。1. 磨削理論與工藝研究深入發(fā)展磨削理論研究是磨削工藝技術(shù)發(fā)展的基礎(chǔ), 磨削工藝技術(shù)與實(shí)踐的發(fā)展又為 磨削理論的研究提供了機(jī)遇, 需求和新課題, 近十幾年來, 從事磨削工程的專業(yè) 人員,對(duì)磨削工藝系統(tǒng)眾多因素和現(xiàn)象進(jìn)行了大量的深入研究, 取得了豐碩成果。2. 磨床高速、高精度零部件單元制造技術(shù)高精度磨床的主軸單元、進(jìn)給單元、支承單元與輔助單元是關(guān)鍵的零部件。 主軸單元
22、包括主軸動(dòng)力源、 主軸、 軸承和機(jī)架幾個(gè)部分, 她影響著加工系統(tǒng)的精 度、穩(wěn)定性及應(yīng)用范圍, 其動(dòng)力學(xué)性能及穩(wěn)定性對(duì)高速高效磨削、 精密超精密磨 削起著關(guān)鍵的作用。進(jìn)給單元包括伺服驅(qū)動(dòng)部件、滾動(dòng)單元、位置檢測(cè)單元等。 進(jìn)給單元是使砂輪保持正常工作的必要條件, 也是評(píng)價(jià)高速、 高效及超高速磨床 性能的重要指標(biāo)之一,因此,要求進(jìn)給單元運(yùn)轉(zhuǎn)靈活、分辨率高、定位精度高、 沒有爬行和較大的移動(dòng)范圍, 既要有較大的加速度, 又要有足夠大的推力、 剛度 高、動(dòng)態(tài)響應(yīng)快、定位精度高。 機(jī)床支承技術(shù)主要指機(jī)床的支承構(gòu)件的設(shè)計(jì)及制 造技術(shù)。 輔助單元技術(shù)包括快速工件裝夾技術(shù), 高效磨削液過濾系統(tǒng)、 機(jī)床安全 裝置、切屑處理及工件清洗技術(shù)、主軸和砂輪架動(dòng)平衡技術(shù)等。3. 磨削自動(dòng)化和智能化隨著機(jī)械制造業(yè)向著FMS(柔性制造系統(tǒng))、CIMS(計(jì)算機(jī)集成制造系統(tǒng))、 IMS (智能制造系統(tǒng))高度自動(dòng)化方向發(fā)展,對(duì)磨削加工提出了自動(dòng)化的要求。 CNC磨床的發(fā)展較CNC車床、銑床等起步較晚。20世紀(jì)80年代、90年代是數(shù)控 磨床迅速發(fā)展和進(jìn)入普及實(shí)用時(shí)期。近年幾乎所有種類的磨床都有CNC產(chǎn)品,CNC工具磨床已從 3 軸發(fā)展到 10 軸。可實(shí)現(xiàn)聯(lián)機(jī)測(cè)量、自動(dòng)交
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