的閉環(huán)控制
(1. 南京航空航天大學(xué) 機(jī)電學(xué)院，南京 210016；
2. 上海交通大學(xué) 金屬基復(fù)合材料國(guó)家重點(diǎn)實(shí)驗(yàn)室，上海 200030;
3. 張家港華通噴射成形有限公司，張家港 215625)
摘 要: 分析了往復(fù)式噴射沉積制備大壁厚管坯的工藝原理，研究了噴嘴噴射高度在線檢測(cè)及閉環(huán)控制方法及技術(shù)。噴射高度控制系統(tǒng)包括漏包提升執(zhí)行機(jī)構(gòu)、沉積層厚度在線測(cè)量、基于PLC的噴嘴高度控制。提升執(zhí)行機(jī)構(gòu)采用伺服電機(jī)驅(qū)動(dòng)的絲杠螺母機(jī)構(gòu)，針對(duì)沉積層間斷增長(zhǎng)的特點(diǎn)，采用間斷提升控制方式；研究了沉積層厚度在線測(cè)量方法，分析了收集基底形狀誤差對(duì)測(cè)量及控制精度的影響并提出多點(diǎn)測(cè)量方案。理論分析表明，采用三點(diǎn)測(cè)量法可消減基底形狀誤差的影響。對(duì)不同內(nèi)徑及壁厚的管坯進(jìn)行了噴射實(shí)驗(yàn)，噴射高度累積誤差低于5%，較好地滿(mǎn)足了大壁厚管坯制備對(duì)穩(wěn)定的噴射高度的要求。
關(guān)鍵字: 管坯；閉環(huán)控制；往復(fù)式噴射沉積；噴射高度；沉積層厚度；在線測(cè)量
tubular preparation with reciprocating spray deposition process
（1. College of Mechanical Engineering, Nanjing University ofAstronautics & Aeronautics, Nanjing 210016, China;
2. State Key Laboratory of Metal Matrix Composites,Shanghai Jiao Tong University, Shanghai 200030, China;
3. Zhangjiagang Huatong Spray Forming Co. Ltd., Zhangjiagang 215625, China）
Abstract:The process principle of reciprocating spray deposition for large thick-wall tubular was analyzed. A new accurate technology of online measurement and closed-loop control for spray height of the nozzle was studied. The control system of spray height consists of executive mechanism of tundish lift, online measurement of deposit layer thickness and control of nozzle height based on PLC. A set of lead-screw mechanism driven by servomotor was applied in the executive mechanism. Aiming at the characteristic of deposit layer growth, the tundish was lifted discontinuously. The measurement method of deposit layer thickness was studied. The influences of shape errors of mandrel on measurement and control accuracy were analyzed and a multi-points measurement technology was presented. Theoretical analysis indicates that the three-point measure along one circle is essential to clear up the influences of the shape errors. Several spray experimentations of the tubular with different inner diameter and wall thickness were carried out. The results indicate that the accumulative error of spray height is less than 5%. This measurement and control technology can well satisfy the need on steady spray height in preparation of large thick-wall tubular.
Key words: tubular; closed loop control; reciprocating spray deposition; spray height; deposit layer thickness; online measurement
