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目前,弹性模量的测定有动态法和静态法两种:动态法是国际上广泛采用的测量方法,GB 1586—91称为悬丝耦合弯曲共振法,是通过测定材料的固有频率来推算弹性模量;静态法多在拉力试验机上附加静态应变仪,由一系列应力及应变的试验数值计算出弹性模量,试验方法标准为GB 8653—88。两种方法的共同缺点是比较繁琐,试样加工困难且误差较大。尽管我厂有多年生产各种材质轧辊的经验,弹性模量的测定仍是个空白。 1 试验原理 为使我厂轧辊在市场竞争中处于优势并最终取代进口轧辊,为新材质开发提供依据,我们选用武钢F4-7高NiCr球芯工作辊进行试验。该规格轧辊系立式离心浇注、低速填芯,铁水采用包内孕育。其化学成分如表1所列。
At present, the determination of elastic modulus dynamic and static methods are two kinds: dynamic method is widely used in the international measurement method, GB 1586-91 known as the suspension wire coupling bending resonance method, by measuring the natural frequency of the material to calculate the elasticity Modulus; static method and more in the tensile testing machine attached to the static strain gauge, calculated by a series of stress and strain test numerical elastic modulus, test method standard is GB 8653-88. The common disadvantage of the two methods is more complicated, the sample processing difficulties and errors. Although my factory has many years of experience in the production of various materials roll, the determination of elastic modulus is still a blank. 1 test principle To make our factory roller in the market competition in the advantages and eventually replace the import roller, provide the basis for the development of new materials, we use the Wuhan Iron and Steel F4-7 high NiCr core work roll for testing. The specifications roll vertical centrifugal casting system, low-speed filling, using hot water inside the package. The chemical composition listed in Table 1.