钢丝缠绕剖分式超高压模具等张力预紧分析

针对超高压装置大型化受限于大质量硬质合金加工困难等问题,设计了一种新型的钢丝缠绕剖分式两面顶超高压模具。该模具主要由内部的剖分式压缸和外部的预应力钢丝组成。对采用等张力钢丝缠绕模具进行了力学模型分析,并通过有限元软件对剖分式压缸和钢丝缠绕层进行研究。结果表明:加载后压缸腔体的最大等效应力出现在压缸腔体内壁;压缸腔体尺寸稳定性与钢丝缠绕层数及钢丝直径成正比;在缠绕层内部,钢丝轴向应力与钢丝直径成反比,与缠绕层数成正比。

Analysis of Equal Tension Pre-Tightening of Steel Wire Winding Split Ultra-High Pressure Die

Due to the machining challenge of high-quality cemented carbide,ultra-high pressure devices are always limited on scale.In our work,a new type of wire wound and split ultra-high pressure die with twoanvil was proposed to try to overcome this limitation.The die is mainly composed of internal split cylinder and external prestressed steel wire.On the basis of the mechanical modeling and via the finite element software,the equal tension winding die was analyzed and the split pressure die as well as steel wire winding layer were studied.The results show that the maximum equivalent stress appears on the inner wall of the pressure die cavity after loading;the dimensional stability of pressure die cavity is proportional to the number of layers of wire winding and the diameter of the wire.The axial stress of the wire in the winding layer is inversely proportional to the diameter of the wire but proportional to the number of layers of the wire.