本文選題：重載鐵路 + U78CrV�。� 參考：《西南交通大學(xué)》2017年碩士論文

【摘要】：重載鐵路承擔(dān)著運輸大宗貨物和煤等物質(zhì)的重任,隨著貨運量不斷增大,對鋼軌承載能力要求也越來越高,強度高、耐磨性好的鋼軌運用前景廣闊。為獲得優(yōu)質(zhì)焊接接頭,最大限度地保障線路安全和長壽命,依賴于鋼軌焊接方法、工藝選擇和設(shè)備控制水平高低。因此使用具有我國完全自主知識產(chǎn)權(quán)的YHGQ-1200氣壓焊軌車,系統(tǒng)開展重載鐵路鋼軌氣壓焊接技術(shù)研究,對于提高重載鐵路焊接水平具有不可估量的實用價值。本文首次采用GPW-1200(75)氣壓焊機,開展了 75kg/m U78CrV鋼軌焊接工藝試驗研究。采用YHGQ-1200氣壓焊軌車和相同焊軌工藝,完成了 60kg/m U78CrV和U75V鋼軌焊接質(zhì)量研究。同時,對PG5、貝氏體新型鋼軌焊接工藝進(jìn)行了初探,為今后PG5和貝氏體鋼軌上重載線路的焊接應(yīng)用提供了參考數(shù)據(jù)。結(jié)果表明:(1)75kg/mU78CrV熱軋鋼軌+熱處理態(tài)鋼軌的混焊試驗成功,獲得了接頭沖擊功15.8J、抗拉強度1005MPa、斷后延伸率9.0%、軌頂面硬度HJ/Hp值在[1.06,1.09]區(qū)間,接頭硬度相當(dāng)于母材硬度,晶粒度在7級以上的接頭質(zhì)量,完全滿足標(biāo)準(zhǔn)TB/T1632-2014《鋼軌焊接》對接頭質(zhì)量的要求。(2)60kg/m U78CrV和U75V鋼軌氣壓焊接發(fā)現(xiàn):U78CrV(熱處理態(tài))鋼軌焊接接頭落錘、靜彎、疲勞性能穩(wěn)定,但焊后正火若不采用強制噴風(fēng)冷卻工藝,其接頭硬度偏低,不滿足標(biāo)準(zhǔn)要求;U75V(熱軋態(tài))鋼軌接頭質(zhì)量完全符合TB/T1632標(biāo)準(zhǔn),其接頭軌頂面硬度HJ/HP值大于1.0,與母材硬度相當(dāng),表明可以從源頭上減少重載線路焊接接頭馬鞍型磨耗病害。獲得的氣壓焊工藝是一套既能夠焊接60kg/mU78CrV(熱軋態(tài)和熱處理態(tài))鋼軌,又能焊接60kg/m U75V(熱軋態(tài))鋼軌的相對寬泛、適用性強的成套焊軌工藝。
[Abstract]:Heavy haul railway undertakes the important task of transporting bulk goods and coal and so on. With the increase of freight volume, the rail bearing capacity is more and more high, the strength is high, the wear resistance of rail is good, and the application prospect of rail is broad. In order to obtain the high quality welding joint and ensure the safety and long life of the line to the maximum extent, it depends on the rail welding method, process selection and equipment control level. Therefore, using YHGQ-1200 pneumatic welding rail car, which has completely independent intellectual property rights in our country, to carry out systematic research on pressure welding technology of heavy-haul railway rail is of inestimable practical value to improve the welding level of heavy-haul railway. In this paper, GPW-1200 (75) pneumatic welding machine is used for the first time to study the welding process of 75kg/m U78CrV rail. The welding quality of 60kg/m U78CrV and U75V rail was studied by using YHGQ-1200 pneumatic rail car and the same welding rail process. At the same time, the welding technology of new type PG5 and bainite rail is discussed, which provides reference data for the application of heavy load line on PG5 and bainite rail in the future. The results show that: (1) the mixed welding test of 75kg / mU78CrV hot rolled rail is successful, and the joint impact energy is 15.8J, the tensile strength is 1005MPa, the elongation after break is 9.0. the hardness of the rail top is in the range of [1.061.09], the hardness of the joint is equal to the hardness of the base metal. The quality of joints with grain size above grade 7 fully meets the requirements of the standard TB / T1632-2014 rail welding for joint quality. (2) 60kg/m U78CrV and U75V rail air pressure welding shows that the weight, static bending and fatigue properties of 60kg/m U78CrV rail welded joints are stable. However, if the normalizing after welding does not adopt the forced air cooling process, the joint hardness is low and the quality of the U75V rail joint does not meet the standard of TB- / T1632. The hardness of the top surface of the joint rail is greater than 1.0, which is equivalent to the hardness of the base metal. It is shown that the saddle wear disease of heavy duty line welded joint can be reduced from the source. The gas pressure welding process is a complete set of welding technology, which can not only weld 60kg / mU78CrV (hot rolled and heat treated) rail, but also weld 60kg/m U75V rail.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U213.92

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