Inventory metal material on the properties of weighing sensor three specific factors

Metal material to the harm of weighing sensor features mainly embodied in three aspects: the modulus of elasticity of raw materials, anelastic effect and thermal elastic effect. Next, how fast to hear weighing sensor manufacturers engineer said: 1, the dangers of metal material elastic modulus is refers to the benefit of the elastic modulus and temperature indicators, it endangers the accuracy and efficiency of the weighing sensor. Generally speaking, we all think of metal materials of market share in a certain range, the elastic modulus E is a constant, it's not hard. In fact, the elastic modulus is only within a certain range near constant. Metal materials with different standard of quenched and tempered, elastic modulus as a constant judgment ability is also different. According to the production of practical experience, medium carbon steel 40 crnimoa weighing sensor is widely used in manufacturing enterprises in our country. After heat treatment and conditioning treatment, the tensile strength of the 40 crnimoa hrc39 above and below; The tensile strength of the 35 crmnsia at hrc42 above and below, elastic modulus of benefit is best, close to a constant. Most of the elastic modulus of metal material by the rise of temperature. Based on the relationship of elastic modulus and temperature, provisions of the elastic modulus with temperature change is not only a linear, and is very stable, is advantageous to the weighing sensor sensitivity of temperature compensation. Used in dynamic weighing of weighing sensor, under the condition of vibration and destructive, elastic element elastic modulus of raw materials do not change or changed little. Therefore, as far as possible use elastic modulus E multiplied by the relative density rho smaller metal materials. 2, the harmfulness of metal materials anelasticity. Anelasticity is refers to the metal materials in the range of elastic deformation. In addition, in the case of slight plastic deformation, stress field and judgement is not in conformity with the hooke law of motion, lead to the deviation of discrete system. There are many forms, including aging, is the key to elastic aftereffect ( The stress relaxation) And so on. 3, the dangers of metal materials thermal elastic effect depends on temperature, frequency, temperature index and the thermal expansion coefficient of elastic modulus E. Weighing sensor factory engineer said, at last: metal materials the thermoelastic effect of symmetric weight sensor temperature characteristic is very unfavorable. With a low beta E and beta f metal materials weighing sensor elastic element is necessary.
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