论文部分内容阅读
刮板输送机中的各种齿轮,经气体渗碳淬火后,有时内孔胀大超过0.40mm(工艺规定0.10～0.30mm),因不够磨量而报废。对这种内孔胀大较大的齿轮,我们用石棉绳搅拌耐火泥将内孔堵实,在气体渗碳炉中,于680℃(一定要低于相变温度)×2.5h下,以甲醇30滴/min进行保护加热,出炉后在HJ10机械油中冷却。在冷却过程中,齿轮因外表面冷却快,由于热应力作用而产生收缩,对
Scraper conveyor in a variety of gear, after carburizing gas quenching, and sometimes the inner hole swell more than 0.40mm (0.10 to 0.30mm process requirements), due to insufficient wear and scrapped. For such a large hole expansion gear, we use asbestos rope mixed with refractory mud blocking the hole, in the gas carburizing furnace at 680 ℃ (must be lower than the phase transition temperature) × 2.5h, with Methanol 30 drops / min for protection and heating, baked in HJ10 mechanical oil cooling. In the cooling process, the gear surface due to cooling fast, due to the role of thermal stress and contraction, the