采用真空加热可得到无氧化、无脱碳、质量优、变形小、性能高、光亮如初的零件,是提高产品质量,满足高精尖热处理的重要途径之一。由于真空加热炉有结构复杂、价格昂贵、维修困难、炉子利用率低等不足,在众多的中小工厂没有这种设备,因而真空热处理的广泛应用受到一定的限制。我们根据真空炉的原理,采用无缝钢管或无缝耐热钢管制成如图所示的简易真空加热炉,用真空泵或加扩散泵将其抽成真空后,把需退火的零件装入,进行真空退火。经多年实践证明,这种简易真空加热 Vacuum heating can be obtained without oxidation, decarburization, excellent quality, small deformation, high performance, bright as ever, is to improve product quality, to meet one of the important ways of sophisticated heat treatment. Due to the complex structure, high cost, difficult maintenance and low utilization rate of the furnace, the vacuum heating furnace has no such equipment in a large number of small and medium-sized factories. Therefore, the wide application of the vacuum heat treatment is limited. According to the principle of vacuum furnace, we use seamless steel pipe or seamless heat-resistant steel pipe to make a simple vacuum heating furnace as shown in the figure. After vacuuming with a vacuum pump or a diffusion pump, the parts to be annealed are loaded, Vacuum annealing was performed. After many years of practice, this simple vacuum heating