施耐德供应商140CRA21110C Quantum

140CRA21110C Quantum

机械设计中可以选择的材料种类众多，不同的材料具有不同的性能，不同的材料对应不同的加工工艺.结构设计中既要根据功能的要求合理地选择适当的材料，又要根据材料的种类确定适当的加工工艺，并根据加工工艺的要求确定适当的结构。只有通过适当的结构设计才能使所选择的材料充分地发挥优势。要做到正确地选择结构材料就充分地了解所选材料的力学性能、加工性能、使用成本等信息。

例如弹性联轴器的设计中需要选择弹性元件的材料有金属、橡胶、尼龙、胶木等。由于所选弹性元件材料的不同，使得联轴器的结构变化很大。由于弹性元件的寿命短，使用中需多次更换.在结构设计中应为更换弹性元件提供可能和方便，为更换弹性元件留有必要的操作空间使更换弹性元件所拆卸、移动的零件尽量少。

结构设计中应根据所选材料的特性及其所对应的加工工艺而遵循不同的设计原则。

钢材受拉和受压时的力学特性基本相同，因此钢梁结构多为对称结构。铸铁材料的抗压强度远大于抗拉强度，因此承受弯矩的铸铁结构截面多为非对称形状，以使承载时大压应力大于大拉应力。塑料结构的强度较差，螺纹联接件产生的装配力很容易使塑料零件损坏.在两个被联接件上分别做出形状简单的搭钩和凹槽,装配时利用塑料零件弹性变形量大的特点使搭钩与凹槽互相咬合实现联接，装配过程简单准确、便于操作。设计的结果要通过制造和装配实现，结构设计中如果能根据所选材料的工艺特点合理地确定结构形式则会为制造过程带来方便。

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