本文選題：TIG焊 + 質(zhì)量控制保證��； 參考：《西南交通大學(xué)》2017年碩士論文

【摘要】：21世紀(jì)以來,焊接產(chǎn)品質(zhì)量控制與保證產(chǎn)品質(zhì)量已成為焊接制造技術(shù)的焦點問題之一,而新興的各種復(fù)合型TIG焊接工藝不但保留一般TIG焊的共同優(yōu)點,同時突破傳統(tǒng)TIG焊的局限,兼具高質(zhì)量和大焊速,應(yīng)用廣泛。TIG焊接過程中電弧長度的穩(wěn)定性直接影響焊接質(zhì)量,因此在精密工件的焊接時需要引入TIG弧長自動控制系統(tǒng)以保證焊接質(zhì)量。本文在調(diào)研主流TIG弧長自動控制技術(shù)和設(shè)計方案的基礎(chǔ)上,分析了現(xiàn)有TIG弧長控制系統(tǒng)的缺點:功能單一、結(jié)構(gòu)復(fù)雜、自動化程度低、成本較高等,提出了以數(shù)字PID為控制策略的新型交直流及脈沖TIG弧長自動控制系統(tǒng):以弧壓為弧長信號,采用步進(jìn)電機細(xì)分驅(qū)動以提高控制精度,以單片機為控制核心增強系統(tǒng)的柔性。在系統(tǒng)硬件電路設(shè)計中考慮了系統(tǒng)對高頻引弧、高壓脈沖引弧和高壓脈沖穩(wěn)弧的適應(yīng)性和對交直流的兼容性,設(shè)計了信號選擇電路、弧壓采集處理電路、單片機控制系統(tǒng)、液晶顯示電路、細(xì)分驅(qū)動電路、定位檢測電路等,并對焊槍調(diào)整機構(gòu)的步進(jìn)電機及行走機構(gòu)進(jìn)行了設(shè)計與選型。結(jié)合所設(shè)計的系統(tǒng)硬件,以c語言按模塊化編寫AD轉(zhuǎn)化、去極值均值濾波信號處理、控制算法、液晶顯示、控制信號生成等功能子程序,實現(xiàn)弧長自動控制的基本功能。搭建了 TIG焊接弧長控制試驗平臺,設(shè)計了弧長跟蹤控制試驗,通過試湊法調(diào)整獲得了系統(tǒng)參數(shù),并優(yōu)化了弧長控制性能。試驗表明:將帶死區(qū)的變速積分PID控制算法應(yīng)用于交直流鎢極氬弧焊弧長跟蹤,能提高系統(tǒng)的動態(tài)性能和控制精度,更好滿足自動化焊接的弧長控制需求。
[Abstract]:Since the 21st century, the quality control and quality assurance of welding products has become one of the focus problems in welding manufacturing technology. However, the emerging hybrid TIG welding processes not only retain the common advantages of general TIG welding, but also improve the quality of welding products. At the same time, it breaks through the limitation of traditional TIG welding and has both high quality and large welding speed. The stability of arc length in wide application of .TIG welding process directly affects the welding quality. So it is necessary to introduce TIG arc length control system to ensure welding quality. Based on the investigation of mainstream TIG arc length control technology and design scheme, this paper analyzes the shortcomings of the existing TIG arc length control system: single function, complex structure, low automation, high cost, etc. A new type of AC / DC and pulse TIG arc length automatic control system based on digital PID is proposed. The arc voltage is taken as the arc length signal, the step motor is subdivided to improve the control precision, and the single chip microcomputer is used as the control core to enhance the flexibility of the system. In the system hardware circuit design, the adaptability of the system to high frequency arc starting, high voltage pulse starting arc and high voltage pulse stabilizing arc and compatibility to AC / DC are considered. The signal selection circuit, arc voltage acquisition and processing circuit, single chip microcomputer control system are designed. Liquid crystal display circuit, subdivision drive circuit, position detection circuit and so on. The step motor and walking mechanism of welding torch adjusting mechanism are designed and selected. Combined with the hardware of the system, the basic function of automatic arc length control is realized by using c language to program AD transform, deextremum mean filter signal processing, control algorithm, liquid crystal display, control signal generation and so on. The TIG welding arc length control test platform was built, and the arc length tracking control test was designed. The system parameters were obtained by trial and error method, and the arc length control performance was optimized. The test results show that the application of variable speed integral PID control algorithm with dead zone in arc length tracking of AC / DC TIG welding can improve the dynamic performance and control accuracy of the system and better meet the requirements of arc length control for automatic welding.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG444.74

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