Stress Analysis and Experiment on a Radial Prism Cavity Split-Type Ultra-High Pressure Die
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摘要: 为了获得更高的承压能力和更大的样品腔容积，在传统年轮式超高压模具的基础上，提出了一种新型棱柱形腔体剖分式超高压模具。其特点在于内部的硬质合金压缸是离散组合式的，且腔体内部的面为平面，可有效减小周向拉应力。压缸剖分块在预紧力的作用下相互挤压，提供了大质量支撑和侧向支撑效果。对剖分成6块的棱柱形腔体剖分式压缸的剖分角度进行了研究，仿真结果表明，剖分角度越大，压缸受力越小。棱柱形腔体剖分式压缸在径向、周向和轴向均承受压应力，其应力条件接近于静水压力状态，可有效提高装置的使用寿命。对压缸的应力分布情况进行进一步分析，发现棱柱形径向剖分式压缸在各方面的表现均最优。经实验验证，相较于年轮式压缸，剖分式压缸具有更高的极限承压能力，并且棱柱形径向剖分式压缸的承压能力大于切向剖分式压缸。Abstract: On the basis of traditional belt type ultra-high pressure die, a new type of prismatic cavity ultra-high pressure die was studied to obtain higher bearing capacity and larger volume of sample cavity. It is characterized in that the cemented carbide cylinder is discrete and combined, and the inner plane of the cavity body is plane, which provides an effective approach to reduce the circumferential tensile stress. Under the action of pre-tightening force, the cylinder block is extruded each other, which provides the effect of large massive support and lateral support. Additionally, the split angle of prismatic cavity is studied. The simulation results show that the larger the split angle, the smaller the pressure of the cylinder. The prismatic cavity cylinder is subjected to compressive stress in radial, circumferential and axial directions. Therefore, its stress condition is close to hydrostatic pressure state, which can effectively improve the service life of the high pressure die. After further study of the stress distribution of pressure cylinder, it is found that the prismatic radial split cylinder has the best performance in all aspects. Compared with belt type cylinder, experimental results show that split cylinder has higher ultimate bearing capacity, and prismatic radial split cylinder owns higher bearing capacity than tangential split cylinder.
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Key words:
- high pressure generation /
- split-type /
- split angle /
- tungsten carbide cylinder
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图 1 年轮式超高压装置示意图和超高压模具新型剖分方式
Figure 1. Schematic diagram of belt-type apparatus and the cylinder split way
图 7 3种压缸在3个方向上的平均法向应力
Figure 7. Average normal stress of three types of cylinders in three directions
图 8 支撑环的等效应力和最大剪应力
Figure 8. Equivalent and maximum shear stresses of the supporting rings
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