本文選題：鈦合金 + 氬氣保護(hù)分級系統(tǒng)　； 參考：《西南科技大學(xué)》2017年碩士論文

【摘要】：鈦合金粉因其卓越的耐高溫、耐腐蝕性和高比強度等理化性能,已成為具有廣闊應(yīng)用前景的3D打印常用原材料。但采用霧化法制備的粉體流動性較差,常規(guī)篩分機的分級效率不高。本文采用新型半渦分級機取代上述傳統(tǒng)分級工藝,設(shè)置一、二級半渦分級機對粒度為0~100μm粉末原材料進(jìn)行三粒度段分級,將粉末一次分級成三個目標(biāo)產(chǎn)品:0~20μm、20~50μm、大于50μm。通過工業(yè)實驗,新型半渦分級機可以將粒度段分為F1的D_(10)=29.6μm、F_2的D_(10)=25.8μm、F_2的D_(90)=47.2μm、旋風(fēng)分離器的D90=19.9μm;一級分級機部分分級效率γ1=30.6%,二級分級機部分分級效率γ2=85.5%,旋風(fēng)分離器清灰效率約為100%;該系統(tǒng)每小時產(chǎn)量為8.24kg/h,分級后可使產(chǎn)品重量比達(dá)到:10%:80%:10%,滿足產(chǎn)品技術(shù)要求。同時針對該系統(tǒng)的工藝要求,本文對旋風(fēng)分離器和濾筒除塵器進(jìn)行了優(yōu)選設(shè)計,并得到了優(yōu)選的結(jié)構(gòu)方案和參數(shù)。針對系統(tǒng)重要運行參數(shù)系統(tǒng)氧含量和壓力,對系統(tǒng)的控制系統(tǒng)進(jìn)行了設(shè)計與調(diào)節(jié),系統(tǒng)正常運行時氧含量為670PPm左右,壓力控制在0~1.2k Pa。針對緊湊結(jié)構(gòu)設(shè)備的要求,對表冷器在狹小空間情況下的進(jìn)風(fēng)均化性進(jìn)行了專門設(shè)計,在增設(shè)分流擋板之后,表冷器出口氣體溫度從56℃降至42℃,達(dá)到技術(shù)要求。對表冷器進(jìn)行數(shù)值模擬并引入相對均方根(RMS)作為氣流分布均勻性指標(biāo)表明:分流擋板的氣流分散均化作用明顯,降熱效果顯著。各平面的RMS值分別為:σ_1=0.11,σ_2=0.29,σ_3=0.07,σ_4=0.27,σ_5=0.07,σ_6=0.28。因此本文提出一種新型的鈦合金粉末分選手段——鈦合金粉體氬氣保護(hù)分級系統(tǒng)。經(jīng)實驗,該系統(tǒng)可以滿足3D打印用鈦合金粉體工業(yè)分級的要求。
[Abstract]:Titanium alloy powder has been widely used in 3D printing because of its excellent physical and chemical properties such as high temperature resistance, corrosion resistance and high specific strength. However, the fluidity of the powder prepared by atomization method is poor, and the classification efficiency of the conventional sieve machine is not high. In this paper, a new type of semi-vortex classifier is used to replace the traditional classifying technology mentioned above. The first and second stage semi-vortex classifier is used to classify the raw materials of powder with the particle size of 0 ~ 100 渭 m in three stages, and the powder is classified into three target products: 020 渭 m ~ (20 渭 m) ~ (20 渭 m) ~ (20) ~ (50 渭 m) at one time, more than 50 渭 m. Through industrial experiments, The new semi-vortex classifier can divide the grain-size segment of D _ 1 into 29.6 渭 m / D _ (10) / D _ (10) / D _ (10) / D _ (10) / D _ (10) / D _ (10) / T of 25.8 渭 m / D _ (10) / T _ (2) / D _ (10 / 10) and D _ (90) (19.9 渭 m) of the cyclone separator respectively; the partial classification efficiency of the first grade classifier is 緯 _ 130.6 / m, the partial classification efficiency of the second _ stage classifier 緯 _ (2) / 85.5, and the efficiency of the cyclone separator is about 100 渭 m / min / min. The output is 8.24 kg / h, and the product weight ratio can reach 10: 10, 80 / 10, and satisfy the technical requirements of the product. At the same time, according to the technological requirements of the system, this paper designs the cyclone separator and filter, and obtains the structure and parameters of the optimal selection. According to the oxygen content and pressure of the system, the control system is designed and adjusted. The oxygen content of the system is about 670PPm and the pressure is controlled at 0 ~ 1.2kPa. According to the requirements of compact structure equipment, the air inlet homogenization of the surface cooler in a small space is specially designed. After adding the shunt baffle, the gas temperature at the outlet of the gauge cooler is reduced from 56 鈩，

本文編號：1874410