Calculation and Numerical Simulation of Winding Discreted Large Cavity of Ultra-High Pressure Die
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摘要: 为了提高年轮式超高压模具腔体的极限承压能力、增大腔体容积，提出了一种缠绕离散式大腔体超高压模具结构，该模具主要由离散式压缸、支撑环和钢丝缠绕层组成。离散式结构消除了整体式压缸的周向应力，模具无需使用大尺寸硬质合金和支撑环，可有效提高模具的极限承压能力，降低模具制造难度，易于实现模具腔体大型化。对模具关键参数进行计算，得到确定模具结构最佳尺寸的方法。数值模拟结果表明：在相同的工作内压加载下，离散式压缸的应力值更低，压缸内壁的应力环境得到有效改善。对缠绕离散式大腔体超高压模具的极限承压能力进行预测，发现随着离散块数量的增加，模具的承压能力逐渐增强，但是增长速度越来越缓慢。因此，不能通过无限增加离散块数量来增加模具的极限承压能力。分析表明，缠绕离散式大腔体超高压模具的承压能力更高，降低了模具的运行成本。研究结果可为大腔体、高承压能力的超高压装置设计提供新思路、新方法。Abstract: In order to improve the ultimate pressure bearing capacity and increase the volume of the cavity of the belt type ultra-high pressure die, a structure of winding discrete type large cavity ultra-high pressure die was proposed. This die is mainly composed of discreted cylinder, supporting ring and steel wire winding layers. The circumferential stress of the monolithic cylinder is eliminated in discrete structure so that there is no need to use large size cemented carbide and supporting ring as high pressure die, which can effectively improves the pressure bearing capacity of high pressure die, reduce the difficulty of its manufacturing, and make it easy to obtain large cavity volume. The key parameters of the structure of high pressure die are designed and calculated to determine the optimal size of the geometry. It is found that under the same working internal pressure loading by comparing numerical simulation methods, the stress of the discrete compression cylinder is lower, and the stress environment on the inner wall of the cylinder is effectively improved. The pressure bearing capacity of the winding discrete large-cavity ultra-high pressure die is predicted. It is found that the pressure bearing capacity of the die gradually increases with the increase of the number of discrete blocks, but the growth rate is slower and slower. Therefore, it is not feasible to increase the pressure bearing capacity of the cylinder by increasing the number of discrete blocks infinitely. The analysis shows that the winding discreted large cavity ultra-high pressure die has higher pressure bearing capacity, longer life and lower operating cost. It provides a new idea and method for the design of high pressure device with large volume and high pressure bearing capacity.
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Key words:
- ultra-high pressure /
- discreted type structure /
- pressure bearing capacity /
- large cavity
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图 1 缠绕离散式大腔体超高压模具受力分析
Figure 1. Stress analysis of ultra-high pressure die for wound discrete large cavities
图 3 离散式压缸的等效应力和最大剪切应力分布
Figure 3. Distribution of equivalent stress and maximum shear stress in discrete pressure cylinder
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