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用30公厘直径的鑄铁试棒所做出的抗彎强度值,并不能决定鑄件的真正强度;因为在壁厚不同时(尤其在15～20公厘时),鑄铁之冷冶却速度也不同,因而金属基體及石墨及石墨的组织也就不同。为了要碓定壁厚封强度的影响,用[表一]中五种不同牌号的鑄铁鑄成许多圆形试棒,直径为10、15、20、25、30、35、40、45、及50公厘,长度为340公厘。试棒是在砂模中用垂直浇鑄法鑄成,每种牌号之鑄铁熔化两次,每次浇鑄每种直径之试捧四个,共浇鑄360个试棒。试验抗拉及抗压强度的试棒,是用经过抗彎试验后的试验棒的剩余部份做成的,直径为10公厘。抗压謶验用的试棒高度为10公厘,硬度是在距未
With 30 mm diameter cast iron test bars to make the bending strength values, and can not determine the true strength of the castings; because of the different thickness (especially at 15 to 20 mm), the cold cast iron The speed is also different, so the metal matrix and graphite and graphite organization will be different. In order to determine the effect of wall thickness seal strength, use [Table 1] in five different grades of cast iron cast a number of round test sticks, diameter 10,15,20,25,30,35,40,45, And 50 mm, a length of 340 mm. The test bars were cast in a sand mold using a vertical casting process. Each grade of cast iron was melted twice and each time a test of four diameters was cast, a total of 360 test bars were cast. Tensile test bars and compressive strength test bars are made of the remaining part of the test bars after the bending test with a diameter of 10 mm. Compression test 棒 test bar height of 10 mm, the hardness is away from