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发动机气缸盖中,气门座锥面对气门导管(以下简称导管)孔的跳动,将直接影响到气阀的密封性及耐用度。为此,规定了较高的要求。以中小型发动机为例,一机部部标NJ14-75规定气门座锥面对导管孔的跳动不大于0.05mm,这个要求成了中小型发动机制造中的工艺难题。一、一般成形铰削分析气缸盖中气阀结构(如图1)主要由气门(未画出)、气门座及导管等组成。也有不镶气门座而直接在气缸盖上加工出气门座锥面的。然而,不论哪种结构,对加工难度而言,无多大区别。气门座锥面的一般成形铰削,即用锥体铰刀,以导管孔为定位基准而进行的铰削加工(如图2)。这种
Engine cylinder head, valve seat cone facing the valve guide (hereinafter referred to as the catheter) hole beating, will directly affect the valve sealing and durability. To this end, the higher the requirement. To small and medium-sized engine, for example, a machine department standard NJ14-75 provisions of the valve seat cone bore hole diameter of not more than 0.05mm, this requirement has become a small and medium-sized engine manufacturing process problems. First, the general shape hinge analysis cylinder valve structure (Figure 1) mainly by the valve (not shown), the valve seat and the catheter and other components. There are also non-inlay valve seat and cylinder valve cover directly on the processing of the cone seat. However, no matter what kind of structure, the difficulty of processing, no big difference. Valve seat conical surface of the general reaming, that is, with a cone reamer, the catheter hole for the positioning of the datum reaming (Figure 2). This