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柴油机汽缸盖上的进排气阀座圈孔(图1中φ62+0.03)与导管孔(图1中φ19+0.023)的同轴度好坏,将影响进排气阀与座圈上座面的密封性能。因而,如何保证这两个底孔的同轴度就成了缸盖加工的主要关键。在我厂大批量生产中,缸盖是在自动线上加工的。座圈孔与导管孔的原来加工工艺如下: (1)钻导管孔φ17.5mm,粗镗座圈孔φ61.5mm(图2)。这道工序是以底面A定位,在双面机床上同时加工。右面机床钻导管孔,起钻的平面C为毛坯面;左面机床在毛坯铸孔上粗镗出座圈孔。 (2)粗铰导管孔φ18.5mm,半精铰座圈孔φ61.5mm(图3)。 (3)精铰导管孔φ19+0.023,精铰座圈孔φ62+
Intake and exhaust valve seat ring hole (φ62 +0.03 in Figure 1) on the cylinder head of the diesel engine and coaxiality of the conduit hole (φ19 + 0.023 in Figure 1) will affect the performance of the intake and exhaust valve and seat upper seat Sealing performance. Therefore, how to ensure the coaxiality of these two bottom holes has become the key to the machining of the cylinder head. In our factory mass production, the cylinder head is processed automatically online. The seat hole and the catheter hole of the original processing technology is as follows: (1) drill pipe hole φ17.5mm, rough boring seat hole φ61.5mm (Figure 2). This process is based on the bottom A positioning, simultaneous processing on a double-sided machine. Drill pipe hole on the right side of the machine, the plane C from the rough surface blank; left rough hole in the rough hole castings seat hole. (2) Rough hinge pipe hole φ18.5mm, semi-fine hinge seat hole φ61.5mm (Figure 3). (3) Precision hinge pipe hole φ19 +0.023, fine hinge seat hole φ62 +