本文關(guān)鍵詞： 異形軸套 冷擠壓 數(shù)值模擬 模具設(shè)計(jì) 塑性成形　出處：《重慶理工大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：異形軸套的傳統(tǒng)制造模式多以機(jī)械加工、特種加工等方式獲得,其材料的利用率、生產(chǎn)效率低,產(chǎn)品力學(xué)性能不高,不能很好的滿(mǎn)足產(chǎn)品使用要求。體積成形、特別是冷擠壓成形能夠有效提高生產(chǎn)效率,提高材料利用率,獲得表面質(zhì)量好,尺寸精度高,力學(xué)性能好的產(chǎn)品零件而被廣泛應(yīng)用于工業(yè)生產(chǎn)中。本文采用冷擠壓成形技術(shù)對(duì)異形軸套的成形進(jìn)行數(shù)值模擬及工藝優(yōu)化研究。本文通過(guò)對(duì)異形軸套件的結(jié)構(gòu)形狀及成形難度的分析研究,根據(jù)產(chǎn)品技術(shù)要求和結(jié)構(gòu)特點(diǎn),設(shè)計(jì)出了擠壓件的精華毛坯。通過(guò)分析計(jì)算異形軸套擠壓件的軸向斷面面積和徑向斷面面積分布變化,得出該零件在擠壓成形時(shí),材料不僅在其軸向和徑向有流動(dòng),同時(shí)還在軸向方向有材料的再分配流動(dòng),成形難度大,為此在制件的成形中增加預(yù)制坯工序和預(yù)成形工序。本文以不同的預(yù)制坯結(jié)構(gòu)形狀設(shè)計(jì)了三種成形工藝方案,制定出冷擠壓成形工藝路線(xiàn),并對(duì)所設(shè)計(jì)的三種成形方案進(jìn)行工藝計(jì)算,確定異形軸套冷擠壓用的設(shè)備。運(yùn)用DEFORM-3D有限元模擬軟件對(duì)異形軸套冷擠壓成形工藝方案中的預(yù)成形工序進(jìn)行數(shù)值模擬,重點(diǎn)分析預(yù)成形過(guò)程中坯料的成形情況、速度場(chǎng)、溫度場(chǎng)、等效應(yīng)力場(chǎng)、等效應(yīng)變場(chǎng)和成形載荷等情況,觀察成形過(guò)程中可能產(chǎn)生的缺陷形式和原因。通過(guò)對(duì)模擬結(jié)果比較分析表明成形工藝方案三為最優(yōu),本文確定異形軸套冷擠壓成形采用工藝方案三,即復(fù)合擠壓預(yù)制方孔坯、預(yù)成形和終成形,對(duì)所確定工藝方案的預(yù)制坯和終成形工序的成形過(guò)程進(jìn)行有限元模擬分析,觀察其成形過(guò)程中各物理場(chǎng)的分布情況,并對(duì)終成形中凸模的摩擦磨損進(jìn)行了模擬分析,優(yōu)化了終成形的擠壓速度和摩擦因數(shù)。最后根據(jù)本文提出的異形軸套冷擠壓成形工藝方案,設(shè)計(jì)了相應(yīng)工序的冷擠壓模具,為異形軸套的工業(yè)化生產(chǎn)提供理論依據(jù)支持和相應(yīng)的實(shí)際應(yīng)用方案。
[Abstract]:The traditional manufacturing mode of special-shaped shaft sleeve is mostly obtained by machining and special processing. Its material utilization efficiency is low the mechanical properties of the product is not high and it can not meet the requirements of product use and volume forming. Especially, cold extrusion can effectively improve the production efficiency, improve the material utilization ratio, obtain good surface quality and high dimensional accuracy. Products with good mechanical properties are widely used in industrial production. In this paper, the numerical simulation and process optimization of shaped shafting are carried out by using cold extrusion forming technology. In this paper, the structure and shape of special-shaped shafts are studied by means of the structure of special-shaped shafts. Analysis and study of the shape and forming difficulty. According to the technical requirements and structural characteristics of the product, the essence blank of the extruded parts is designed. The axial and radial sectional area distribution of the extruded parts with special-shaped sleeve is calculated by analyzing and calculating. It is concluded that the material flows not only in the axial and radial direction, but also in the axial direction when the material is extruded, so it is difficult to form. For this reason, preform and preform processes are added to the forming process of the parts. In this paper, three kinds of forming process schemes are designed according to different preform structure shapes, and the cold extrusion forming process route is worked out. The process calculation of the three kinds of forming schemes is also carried out. The equipment for cold extrusion of special-shaped shaft sleeve was determined. The preforming procedure in the cold extrusion process of special-shaped shaft sleeve was simulated by using DEFORM-3D finite element simulation software. The forming condition, velocity field, temperature field, equal effect force field, equivalent strain field and forming load are analyzed in detail. Through the comparison and analysis of the simulation results, it is shown that the forming process plan 3 is the best. In this paper, the special shape shaft sleeve cold extrusion process is determined to adopt process plan three. That is, preforming and final forming of prefabricated square hole billet by composite extrusion, finite element simulation analysis of the preform and final forming process of the determined process plan is carried out, and the distribution of each physical field during the forming process is observed. The friction and wear of die in final forming are simulated and analyzed, the extrusion speed and friction coefficient of final forming are optimized. Finally, according to the cold extrusion process of special-shaped shaft sleeve proposed in this paper. The cold extrusion die of the corresponding working procedure is designed, which provides the theoretical basis and the corresponding practical application scheme for the industrial production of the special-shaped shaft sleeve.
【學(xué)位授予單位】：重慶理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TG376

【共引文獻(xiàn)】

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6 馬俊;梁勝龍;;ZK60鎂合金帶內(nèi)筋矩形管穿孔針擠壓工藝仿真和實(shí)驗(yàn)研究[J];鍛壓技術(shù);2014年11期

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