本文選題：高壓潤滑　切入點(diǎn)：拔制力　出處：《燕山大學(xué)》2015年碩士論文

【摘要】：冷拔管由于其良好的性能,廣泛用于我國工業(yè)建設(shè)中,有“工業(yè)血管”之稱。然而,用于高新產(chǎn)品中的冷拔管與普通冷拔管不同,它要求管材的尺寸精度更高,表面質(zhì)量更好。而傳統(tǒng)的拉拔工藝生產(chǎn)的管材很難達(dá)到高精度管材的要求,拉拔后的產(chǎn)品仍需經(jīng)過打磨拋光等工序才能達(dá)到要求。短芯棒管材拉拔工藝用于管材內(nèi)外徑尺寸及表面質(zhì)量均要求較高的精密管材的拉拔生產(chǎn)。但由于芯棒與管材內(nèi)表面之間的潤滑散熱不良,極易發(fā)生膠合,難于生產(chǎn)出合格的產(chǎn)品。鋼管內(nèi)外模高壓潤滑冷拔成形技術(shù)是基于短芯棒拉拔工藝的創(chuàng)新,采用邊界潤滑減小摩擦對拉拔過程的影響,減小拉拔力;且散熱良好,從而提高了冷拔后管材的精度。本文主要研究工作有:1.考慮密封缸液體壓力對管尾端的推力作用,推導(dǎo)出內(nèi)外高壓潤滑拉拔條件下的拉拔力計(jì)算公式;2.利用有限元仿真軟件MSC.Marc對管端縮口成形工藝過程進(jìn)行模擬。重點(diǎn)研究了縮口成形極限及不同厚徑比對管材成形極限的影響,并簡單分析了應(yīng)力分布規(guī)律及工藝參數(shù)對縮口力的影響;3.利用限元仿真軟件MSC.Marc對冷拔過程進(jìn)行模擬,分析了軸向應(yīng)力、徑向應(yīng)力、剪應(yīng)力、米塞斯應(yīng)力的分布規(guī)律。研究了密封缸內(nèi)壓力對軸向應(yīng)力的影響,并通過軸向應(yīng)力模擬值和計(jì)算值的比較,證明了拉拔力公式的準(zhǔn)確性;4.通過大量的模擬,分析了摩擦系數(shù)、模角、拉拔速度、斷面收縮率及密封缸液體壓力等對拉拔力的影響,從中得到了最佳模錐角,并對管材斷面收縮的極限進(jìn)行了研究;5.對實(shí)際生產(chǎn)遇到的問題進(jìn)行了分析,并提出了解決措施。以上的研究成果,可為實(shí)際生產(chǎn)提供理論支持和技術(shù)指導(dǎo)。
[Abstract]:Cold-drawn tube is widely used in industrial construction of our country because of its good performance.However, the cold drawing pipe used in high-tech products is different from the common cold drawn tube, which requires higher dimensional accuracy and better surface quality.The pipe produced by traditional drawing process is difficult to meet the requirement of high precision pipe, and the product after drawing still needs to be polished and polished to meet the requirements.Short mandrel tubing drawing process is used in the production of precision pipe with high internal and external diameter and surface quality.However, due to the poor lubrication and heat dissipation between the mandrel and the inner surface of the pipe, it is easy to glue and produce qualified products.The technology of high pressure lubrication cold drawing for inner and outer die of steel tube is based on the innovation of short mandrel drawing process. Boundary lubrication is adopted to reduce the influence of friction on drawing process and to reduce drawing force, and the heat dissipation is good, thus improving the precision of the tube after cold drawing.The main research work of this paper is: 1.Considering the thrust effect of the liquid pressure on the end of the pipe, the formula for calculating the drawing force under the condition of internal and external high pressure lubrication drawing is deduced.Finite element simulation software MSC.Marc is used to simulate the forming process.The influence of shrinkage forming limit and different thickness / diameter ratio on the forming limit of pipe is studied emphatically, and the influence of stress distribution law and process parameters on shrinkage force is simply analyzed.The finite element simulation software MSC.Marc is used to simulate the cold drawing process and the distribution of axial stress radial stress shear stress and Mises stress are analyzed.The influence of the pressure in the seal cylinder on the axial stress is studied, and the accuracy of the drawing force formula is proved by comparing the simulated and calculated values of the axial stress.The influence of friction coefficient, die angle, drawing speed, cross section shrinkage ratio and liquid pressure of seal cylinder on drawing force are analyzed through a large number of simulations. The optimum die cone angle is obtained, and the limit of cross section shrinkage of pipe is studied.The problems encountered in actual production are analyzed, and the solving measures are put forward.The above research results can provide theoretical support and technical guidance for actual production.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG356

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