拖拉机发动机的气门——气门导管摩擦付是在半干摩擦工况下服役的,这会增加发动机燃气压力损失、降低发动机的功率.在这种情况下,耐磨性能就成为决定气门导管和整台发动机工作可靠性和寿命的重要参数.气门导管用灰铸铁制成毛坯再经机械加工而成的.为维持高效率生产,气门导管要无白口,通常采用提高铸铁中的含硅量的方法.文献中介绍有关硅影响灰铸铁耐磨性的数据往往是相互矛盾的.因此有必要重新进行研究. The tractor engine valve-valve train friction service is performed under semi-dry friction conditions, which increases engine gas pressure loss and reduces engine power, in which case wear resistance becomes the key to determining valve guides and Taiwan engine reliability and life of the important parameters of the valve guide made of gray cast iron and then machined from the To maintain the high efficiency of production, there should be no valve white catheter mouth, usually used to increase the silicon content of cast iron Methods The literature on the effect of silicon on the wear resistance of gray cast iron is often contradictory and it is therefore necessary to re-examine it.