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我厂活塞环(又名漲圈)是用优質珠光体鑄鉄制造的,材料的化学成分是:碳3.0～3.2％,硅(矽)1.4～1.6％,錳0.7～0.9％,磷0.3～0.5％,硫小于0.08,铬0.3～0.5％,鎳0.8～1.2％。鑄造后的金相組織:基体是細密珠光体,白色磷共晶均匀分布在基体中間,石墨呈A-B型。活塞环在机械加工切口后,就进行定形处理。采用的方法是把活塞环兩末端扳开放在夾具(如附圖)楔子上,然后进行热处理。楔子的尺寸等于活塞环在自由狀态下鎖口的間隙再加大10％。由于热处理的結果,消除了活塞环在扳开时所产生的內部应力,同时使它保持張开鎖口的狀态,而且具有一定的彈力。过去,活塞环定形处理是采用这样的工艺: 把活塞环放在爐溫200～300℃的燃煤反射爐里加热2.5～3小时,溫度升
Our factory piston ring (also known as up ring) is made of high quality pearlitic castings, the chemical composition of the material is: carbon 3.0 to 3.2%, silicon (silicon) 1.4 to 1.6%, manganese 0.7 to 0.9%, phosphorus 0.3 ~ 0.5% sulfur, less than 0.08, 0.3-0.5% chromium and 0.8-1.2% nickel. After casting the microstructure: the matrix is fine pearlite, white phosphorus eutectic evenly distributed in the middle of the matrix, graphite was A-B type. Piston rings machined in the incision, the shape processing. The method is to open the piston ring on both ends of the clamp (Figure) on the wedge, and then heat treatment. The size of the wedge is equal to the piston ring in the free state of the lock to increase the gap of 10%. As a result of the heat treatment, the internal stress generated when the piston ring is pulled open is eliminated, and at the same time, it is maintained in the state of opening the lock and has a certain elasticity. In the past, the piston ring shape processing is the use of such a process: the piston ring on the furnace temperature 200 ~ 300 ℃ coal fired furnace heated 2.5 to 3 hours, the temperature rise