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21吨齿条推钢机上的齿条(加工刨齿后)净重2300公斤,材质为45号铜钢,加工后齿面硬度170～210H_B,要求齿条上下表面不平行度不得大干0. 2公厘。由于我厂铸造及热处理技术和设备条件上的限制,要求将齿条分为甲乙二段铸造,再分别进行热处理,然后用焊接的方法将两部分焊接在一起(见图1)。齿条制造总的工艺过程是:铸造,退火,粗加工(包括刨接口处的焊缝坡口,见图2),淬火及回火(回火后
21 tons of rack on the push machine rack (after processing gear) 2300 kg net weight, the material is 45 copper, after processing the tooth surface hardness 170 ~ 210H_B, requires no parallelism between the upper and lower racks of the rack 0. 2 Mm. Due to the limitations of our casting and heat treatment technology and equipment conditions, the rack is required to be divided into two sections of castings of Grade A and B, and then separately heat-treated. The two sections are then welded together by welding (see Figure 1). The overall process of rack manufacturing is: casting, annealing, roughing (including the welding groove at the plane interface, see Figure 2), quenching and tempering (after tempering