本文選題：直齒圓柱齒輪 + 精密鍛造�。� 參考：《安徽工業(yè)大學(xué)》2017年碩士論文

【摘要】：直齒圓柱齒輪作為重要的機(jī)械傳動零件之一,在汽車、航空等各個領(lǐng)域發(fā)揮著重要的作用,隨著社會的迅速發(fā)展,傳統(tǒng)的切削加工已遠(yuǎn)遠(yuǎn)滿足不了市場的需求,因此,國內(nèi)外專家和學(xué)者加大對直齒圓柱齒輪工藝的研究開發(fā),齒輪精鍛成形技術(shù)得到了迅速的發(fā)展與應(yīng)用,精密鍛造成形成為一種高效、高精度、低成本的成形工藝。本文通過對比三種不同成形方案,應(yīng)用有限元數(shù)值模擬軟件分別對孔分流成形、浮動凹模成形以及閉塞鍛造成形工藝進(jìn)行數(shù)值模擬分析,研究結(jié)果表明:采用閉塞鍛造成形工藝,在上、下沖頭的作用下,齒形中部優(yōu)先形成,并同時向齒輪上、下兩端角隅處流動,金屬流動的均勻性更好,有利于上、下兩端角隅的填充,而分流法與浮動凹模成形工藝,由于上凸模的作用下,會導(dǎo)致上、下兩端角隅填充不均勻,同時所需的擠壓力也比較大。分流法和浮動凹模法仍存在齒形填充困難以及成形載荷較高等問題。同時,本文對比分析了三種成形工藝下齒形處的等效應(yīng)力與最大主應(yīng)力。研究了閉塞鍛造成形過程中擠壓速度、坯料初始溫度對擠壓力的影響,擠壓速度的大小對擠壓力的影響較小,而坯料初始溫度對擠壓力影響較為明顯,最后對鍛件成形過程中進(jìn)行點(diǎn)跟蹤與缺陷分析。因此,通過數(shù)值模擬對比分析表明直齒圓柱齒輪閉塞溫鍛成形具有良好的工藝性能,為以后生產(chǎn)應(yīng)用提供了理論依據(jù)。
[Abstract]:As one of the important parts of mechanical transmission, spur gear plays an important role in automobile, aviation and other fields. With the rapid development of society, the traditional cutting can not meet the needs of the market. Experts and scholars at home and abroad increase the research and development of spur gear technology, gear precision forging technology has been rapid development and application, precision forging has become a high efficiency, high precision, low cost forming process. In this paper, by comparing three different forming schemes, the finite element numerical simulation software is used to simulate and analyze the hole flow forming, floating die forming and block forging process respectively. The results show that under the action of upper and lower punch, the middle part of the tooth is formed preferentially by the closed forging process, and at the same time it flows to the corner of the gear at the same time, and the flow of metal is more uniform, which is beneficial to the upper gear, the lower end of the gear and the corner of the lower end of the gear. The filling of the corner of the lower two ends, and the split method and the forming process of the floating concave die, due to the action of the upper punch, will lead to uneven filling of the corner at the upper and lower ends, and the extrusion pressure required is also relatively large. There are still some problems such as tooth filling difficulty and high forming load in split flow method and floating die method. At the same time, the equivalent stress and the maximum principal stress at the tooth profile under three forming processes are compared and analyzed in this paper. The influence of extrusion speed and initial temperature of billet on extrusion pressure is studied. The influence of extrusion speed on extrusion pressure is small, while the influence of initial temperature of billet on extrusion pressure is obvious. Finally, point tracking and defect analysis are carried out in forging forming process. Therefore, the comparison and analysis of numerical simulation show that the closed warm forging of spur gear has good technological performance, which provides a theoretical basis for future production and application.
【學(xué)位授予單位】：安徽工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG316

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本文編號：2105471