本文選題：雙金屬滑動(dòng)軸承　切入點(diǎn)：液態(tài)模鍛　出處：《北京交通大學(xué)》2011年碩士論文

【摘要】：滑動(dòng)軸承是折彎?rùn)C(jī)、剪板機(jī)的主要工作部件,由于長(zhǎng)期在高速旋轉(zhuǎn)和高應(yīng)力磨損狀態(tài)下,滑動(dòng)軸承磨損消耗十分迅速。滑動(dòng)軸承傳統(tǒng)的鑄造方法在使用過程中暴露出了一系列的問題,如極易產(chǎn)生縮松、縮孔缺陷,致密度低等。為了解決這些問題,本文提出了采用液態(tài)模鍛雙金屬復(fù)合的工藝方式進(jìn)行滑動(dòng)軸承的生產(chǎn),以提高滑動(dòng)軸承的使用壽命和降低其生產(chǎn)成本。本文的研究以Q11-6.3×2000型滑動(dòng)軸承為對(duì)象,從滑動(dòng)軸承規(guī)格選擇、結(jié)構(gòu)設(shè)計(jì)、液態(tài)模鍛工藝和模具設(shè)計(jì)等方面進(jìn)行了系統(tǒng)的實(shí)驗(yàn)與理論研究。 根據(jù)軸套的結(jié)構(gòu)特點(diǎn)進(jìn)行了傳熱分析,并根據(jù)傳熱分析及假設(shè),利用徑向系統(tǒng)中的一維導(dǎo)熱以及熱阻分析方法建立了滑動(dòng)軸承在服役條件下溫升計(jì)算和襯層厚度設(shè)計(jì)的數(shù)學(xué)模型。。 在軸套直接液鍛成形過程中,模具預(yù)熱溫度、金屬液澆注方式及溫度、開始加壓時(shí)間都對(duì)軸套的成形質(zhì)量有一定影響,通過協(xié)調(diào)以上各參數(shù),可以避免軸套中出現(xiàn)冷隔、氣孔、褶皺等缺陷。此外,試驗(yàn)中涂料的干燥程度對(duì)軸套中氣孔的數(shù)量和分布有重要影響。 文章進(jìn)行了月產(chǎn)200t批量生產(chǎn)軸套直接液鍛成形工藝設(shè)計(jì)、設(shè)備選型及模具設(shè)計(jì)。該工藝中成形壓力為340t、金屬液澆注溫度為1200℃、保壓時(shí)間為5s、模具預(yù)熱溫度180-200℃加壓和充型速度50mm/s、鋼套預(yù)熱溫度600℃等。熔煉爐的最高溫度應(yīng)低于1300℃,最大熔煉質(zhì)量為159Kg。并使用彎銷脫模機(jī)構(gòu)對(duì)模具結(jié)構(gòu)進(jìn)行了簡(jiǎn)化。
[Abstract]:Sliding bearing is the main working part of bending machine and shearing machine, because of long time under the condition of high speed rotation and high stress wear, In order to solve these problems, the traditional casting method of sliding bearing has exposed a series of problems, such as easy to produce shrinkage, shrinkage hole defect, low density and so on. In this paper, the production of sliding bearing by liquid die forging bimetallic composite technology is put forward in order to increase the service life of sliding bearing and reduce its production cost. The research of this paper takes Q11-6.3 脳 2000 type sliding bearing as an object. Systematic experimental and theoretical studies are carried out on the aspects of sliding bearing specification selection, structure design, liquid die forging process and die design. The heat transfer analysis is carried out according to the structural characteristics of the shaft sleeve, and according to the heat transfer analysis and hypothesis, The mathematical model of temperature rise calculation and liner thickness design of sliding bearing under service condition is established by using one-dimensional heat conduction and thermal resistance analysis method in radial system. In the process of direct liquid forging of the shaft sleeve, the preheating temperature of die, the pouring mode and temperature of molten metal, and the time of starting pressure all have certain influence on the forming quality of the shaft sleeve. Through the coordination of the above parameters, the cold insulation can be avoided in the shaft sleeve. In addition, the drying degree of paint has an important effect on the number and distribution of pores in the shaft sleeve. In this paper, the direct liquid forging process design, equipment selection and die design of the 200 t batch production shaft sleeve are carried out. The forming pressure is 340 t, the pouring temperature of molten metal is 1200 鈩，

本文編號(hào)：1691199