發(fā)布時(shí)間：2018-04-25 08:15

  本文選題：軸向旋轉(zhuǎn)熱管砂輪 + 樅樹形　； 參考：《南京航空航天大學(xué)》2017年碩士論文

【摘要】：結(jié)合超硬磨料技術(shù)的發(fā)展與應(yīng)用,成型磨削在航空難加工材料(如高溫合金、鈦合金等)加工中的優(yōu)勢(shì)愈來(lái)愈顯著,尤其在加工難度較大的航空發(fā)動(dòng)機(jī)渦輪盤榫槽的加工中,成型磨削的加工精度和表面質(zhì)量都優(yōu)于其他加工方式。然而,由于航空難加工材料粘附性強(qiáng)、導(dǎo)熱性差等特點(diǎn),使得成型磨削時(shí)磨削溫度過(guò)高從而引起工件表面熱損傷以及砂輪磨損,這勢(shì)必制約了成型磨削技術(shù)優(yōu)勢(shì)的充分發(fā)揮。此前已有研究將徑向旋轉(zhuǎn)熱管砂輪用于磨削弧區(qū)溫度的控制,充分顯示了“熱管技術(shù)”用于難加工材料高效磨削中的可行性。有鑒于此,本文將軸向旋轉(zhuǎn)熱管引入成型砂輪的設(shè)計(jì)中,研制出了軸向旋轉(zhuǎn)熱管砂輪用于渦輪盤樅樹形榫槽的成型加工,并開展了一系列傳熱性能試驗(yàn),驗(yàn)證了軸向旋轉(zhuǎn)熱管砂輪用于難加工材料成型磨削中的可行性,探究了熱管砂輪冷凝段冷卻條件、充液量以及蒸發(fā)段熱流密度等因素對(duì)軸向旋轉(zhuǎn)熱管砂輪傳熱性能的影響。研究成果對(duì)于解決成型磨削難加工材料時(shí)磨削溫度過(guò)高的問(wèn)題具有重要意義。本文完成的工作主要包括:(1)針對(duì)渦輪盤樅樹形榫槽的加工要求,提出軸向旋轉(zhuǎn)熱管砂輪的設(shè)計(jì)方法,并依據(jù)此設(shè)計(jì)方法完成了可拆卸軸向旋轉(zhuǎn)熱管砂輪的設(shè)計(jì)及制作;(2)對(duì)結(jié)構(gòu)較為簡(jiǎn)單的圓柱形軸向旋轉(zhuǎn)熱管砂輪進(jìn)行傳熱性能分析,驗(yàn)證了其疏導(dǎo)弧區(qū)磨削熱的可行性,分析得出了合適的冷凝段冷卻條件和充液量。結(jié)果表明,充液量為熱管體積15%且冷凝段采用6℃、85 m/s以上冷風(fēng)射流冷卻時(shí)能充分發(fā)揮軸向旋轉(zhuǎn)熱管砂輪的傳熱性能;(3)開展樅樹形軸向旋轉(zhuǎn)熱管砂輪的傳熱性能試驗(yàn),并結(jié)合熱管砂輪蒸發(fā)段內(nèi)腔的工質(zhì)分布仿真結(jié)果,為樅樹形軸向旋轉(zhuǎn)熱管砂輪充液量的選擇和結(jié)構(gòu)優(yōu)化提供依據(jù)。鑒于樅樹形軸向旋轉(zhuǎn)熱管砂輪內(nèi)部結(jié)構(gòu)的特殊性,工作介質(zhì)在旋轉(zhuǎn)狀況下易集中在蒸發(fā)端偏上及絕熱段的位置,因此為了更好地發(fā)揮熱管的優(yōu)勢(shì),相對(duì)于圓柱形軸向旋轉(zhuǎn)熱管砂輪,應(yīng)將充液量提高一倍左右。
[Abstract]:Combined with the development and application of superhard abrasive technology, the advantages of molding grinding in the processing of aviation refractory materials (such as superalloy, titanium alloy, etc.) are becoming more and more obvious, especially in the machining of engine turbine disk tenon grooves, which are more difficult to process. The machining accuracy and surface quality of molding grinding are superior to other machining methods. However, due to the characteristics of high adhesion and poor thermal conductivity of aviation refractory materials, the high grinding temperature in molding grinding will cause thermal damage on workpiece surface and grinding wheel wear, which will restrict the full play of the advantages of molding grinding technology. Previous studies on the application of radial rotating heat pipe grinding wheel to the temperature control of grinding arc zone have fully demonstrated the feasibility of "heat pipe technology" in high efficiency grinding of refractory materials. In view of this, the axial rotating heat pipe is introduced into the design of the grinding wheel, and the axial rotating heat pipe grinding wheel is developed for the forming process of the fir tree tenon groove of the turbine disk, and a series of heat transfer performance tests have been carried out. The feasibility of axial rotating heat pipe grinding wheel used in forming grinding of refractory materials was verified. The effects of cooling conditions of condensing section of heat pipe wheel, liquid filling amount and heat flux of evaporation section on the heat transfer performance of axial rotating heat pipe grinding wheel were investigated. The research results are of great significance to solve the problem of high grinding temperature in forming grinding difficult materials. The work accomplished in this paper mainly includes: (1) according to the machining requirement of turbine disk fir tree tenon groove, the design method of axial rotating heat pipe grinding wheel is put forward. According to this design method, the design and manufacture of the detachable axial rotating heat pipe grinding wheel are completed. The heat transfer performance of the cylindrical axial rotating heat pipe grinding wheel with simple structure is analyzed, and the feasibility of grinding heat in the dredge arc zone is verified. The appropriate cooling conditions and liquid filling amount of the condensing section are obtained. The results show that the heat transfer performance of the fir tree axial rotating heat pipe wheel can be fully developed when the condensing section is cooled by cold air jet at 6 鈩，

本文編號(hào)：1800507