汽車發(fā)動(dòng)機(jī)連桿分級(jí)加工技術(shù)外文及翻譯-wenkub
2022-11-07 08:03:12 本頁面
【正文】 are simplified and the whole machining process is also reduced. For example, as far as the processing of whorl hole is concerned, the traditional method needs 14 procedures, but it only requires six steps by applying fracture splitting method (Fig. 2). It is reported that the fracture splitting process can decrease manufacturing procedures by 60%, reduce equipment and tools investment by 25% ～ 35% and reduce energy use by 40% [1, 7–9]. So the total production cost is reduced considerably. The con/rods made by traditional method and fracture splitting method are shown in Fig. 3. 3 Key influence factors of fracture splitting process Materials of fracture splitting con/rod The material of con/rod is a major factor that influences the fracture splitting process. Material not only affects con/rod’s me chemical properties such as rigidity, hardness, tensile and fatigue strength, but also directly influences fracture splitting ability and cleavage surface quality. The material suitable for fracture split ting con/rod should have the following properties: (1) little declines。 ４２ 論文圖紙，請(qǐng)聯(lián)系 :68661508 附件 1 Fracture splitting technology of automobile engine connecting rod Abstract The fracture splitting method is an innovative processing technique in the field of the automobile engine connecting rod (con/rod) manufacturing. Compared with traditional method, the technique has remarkable advantages. It can decrease manufacturing procedures, reduce equipment and tools investment and save energy. Hence the total production cost is greatly reduced. Furthermore, the technique can also improve product quality and bearing capability. It provides a high quality, high accuracy and low cost route for producing connecting rods (con/rods). The method has attracted extensive attention and has been used in some types of con/rods manufacturing. The process and its key factors such as materials, notches for fracture splitting, fracture splitting conditions and fracture splitting equipment are discussed in detail. ４３ Keywords Automobile engine formation in fracture splitting。它 可以減少選用純銀程序 ,減少設(shè)備和工具投資 ,節(jié)約能源。該方法引起了廣泛關(guān)注 ,并被應(yīng)用于某些類型的連桿的制造。因此 ,許多新技術(shù)已經(jīng)開發(fā)生產(chǎn)部分。因此 ,該技術(shù)已被廣泛研究和應(yīng)用。它有一個(gè)非常低的缺陷比例和已經(jīng)被用于生產(chǎn)某些類型的汽車連桿。 (2)其他零件 ,如用于固定位置的螺栓和螺紋孔的結(jié)構(gòu)非常復(fù)雜 ,而且還要求螺紋孔是保持高水平垂直的表面。然后 ,推動(dòng)與楔形鍵向下移動(dòng) ,推動(dòng)了夾具的大橫移 ,導(dǎo)致大頭從兩端脆性破裂。因此 ,它不需要機(jī)器加工帽和桿的表面，也不需要使用拋光過程處理螺紋孔，插入銷 ,銷子或擴(kuò)孔定位螺栓等部 分。所以總生產(chǎn)成本大大降低。材料適合汽車連桿的分裂能力應(yīng)該有以下屬性 :(1)較小的變形 。但不可能使用傳統(tǒng)高碳合金鋼制造汽車連桿 ,因?yàn)橛刑蟮难有院退苄宰冃我鸬牧芽p分割的壓力。例如 ,降低 Mn 和 N 的含量和增加 Si 和 V 的內(nèi)容將有助于獲得更低的延性。在鋼鐵中錳的含量很低 ,V在鐵素體基體中添加低延性， S 有助于材料的切削加工性能的改善。因?yàn)榱芽p形式提出兩個(gè)等級(jí) ,從應(yīng)力集中效應(yīng) ,然后與徑向壓力增加裂縫向外擴(kuò)展 ,直到分裂完全結(jié)束。影響捷達(dá)車連桿切口深度斷裂分裂壓力研究 (圖 ５０ 4)。實(shí)驗(yàn)結(jié)果表明 ,適當(dāng)?shù)那锌谏疃鹊奈挥谄囘B桿 ～ 毫米 處。 目前 ,有幾種方法來處理等級(jí)。其次拉刀的磨損和損壞會(huì)增加缺口底部半徑 ,減少切口深度。所有這些將會(huì)增加生產(chǎn)成本。 ５１ Optimizing the hotfing process parameters for connecting rods made of PM titanium alloy Abstract In order to optimize the processing parameters of a new lowcost titanium alloy connecting rod made of powder fing, the deformation behavior of an a — b type Ti–– (wt%) alloy produced by elemental powder metallurgy (PM) route was studied using isothermal pression tests. The constitutive equations and a processing map were established to characterize the flow behavior and predict the optimum deformation parameters. The calculated apparent activation energy was kJ/mol for deformation in the a — b phase region and kJ/mol in the b phase region. Two deformation mechanism domains were found: a — b — b phase transformation and dynamic recrystallization. The results show that the optimum deformation parameters for the present alloy are (700–800 LC, –1 s1) and (800–900 LC, 102–10 s1). Based on these results, a finite element method (FEM) simulation of the hotforming of a connecting rod was conducted, and the simulated results have been successfully used in an industrial fing of the connecting rod. Introduction High strength, low density, and excellent corrosion resistance are the main properties that make titanium and its alloys attractive for a variety of applications, such as in aircraft, aeroengines, and bio medical devices, and as ponents of chemical devices [1]. Several modeling approaches, including the stress–strain curves, kiic analysis, and processing maps, are widely used to characterize the deformation behavior of titanium alloys in order to understand how to control their micro structures and optimize manufacturing processes. Zhang et al. [2] studied the effect of deformation temperature and strain rate on the flow stress of a TC11 alloy (Ti––––, wt%) and pointed out that the temperature of deformation affects obviously the steady flow stress and that the higher the tem
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