钛合金粉体氩气保护分级系统设计与工业实验

发布时间：2018-05-11 14:53

  本文选题：钛合金 + 氩气保护分级系统　； 参考：《西南科技大学》2017年硕士论文

【摘要】：钛合金粉因其卓越的耐高温、耐腐蚀性和高比强度等理化性能,已成为具有广阔应用前景的3D打印常用原材料。但采用雾化法制备的粉体流动性较差,常规筛分机的分级效率不高。本文采用新型半涡分级机取代上述传统分级工艺,设置一、二级半涡分级机对粒度为0~100μm粉末原材料进行三粒度段分级,将粉末一次分级成三个目标产品:0~20μm、20~50μm、大于50μm。通过工业实验,新型半涡分级机可以将粒度段分为F1的D_(10)=29.6μm、F_2的D_(10)=25.8μm、F_2的D_(90)=47.2μm、旋风分离器的D90=19.9μm;一级分级机部分分级效率γ1=30.6%,二级分级机部分分级效率γ2=85.5%,旋风分离器清灰效率约为100%;该系统每小时产量为8.24kg/h,分级后可使产品重量比达到:10%:80%:10%,满足产品技术要求。同时针对该系统的工艺要求,本文对旋风分离器和滤筒除尘器进行了优选设计,并得到了优选的结构方案和参数。针对系统重要运行参数系统氧含量和压力,对系统的控制系统进行了设计与调节,系统正常运行时氧含量为670PPm左右,压力控制在0~1.2k Pa。针对紧凑结构设备的要求,对表冷器在狭小空间情况下的进风均化性进行了专门设计,在增设分流挡板之后,表冷器出口气体温度从56℃降至42℃,达到技术要求。对表冷器进行数值模拟并引入相对均方根(RMS)作为气流分布均匀性指标表明:分流挡板的气流分散均化作用明显,降热效果显著。各平面的RMS值分别为:σ_1=0.11,σ_2=0.29,σ_3=0.07,σ_4=0.27,σ_5=0.07,σ_6=0.28。因此本文提出一种新型的钛合金粉末分选手段——钛合金粉体氩气保护分级系统。经实验,该系统可以满足3D打印用钛合金粉体工业分级的要求。
[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 纬 _ 130.6 / m, the partial classification efficiency of the second _ stage classifier 纬 _ (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，

本文编号：1874410