【摘要】 为了提高普通年轮式超高压模具的最大承载能力,提出了一种新型球弧式纵向剖分超高压模具结构。该模具的球弧式结构将对超高压模具损害最大的周向拉应力转变为轴向应力,并通过纵向剖分方式降低了轴向应力,提高了超高压模具压缸的极限承载能力。球弧式纵向剖分超高压模具不仅可以降低超高压模具的最大等效应力和最大切向应力,而且模具的腔体容积也相应增大。数值模拟结果表明:在相同载荷条件下,球弧式纵向剖分超高压模具的周向拉应力、等效应力和最大切向应力分别比普通年轮式超高压模具减小了68.1%、 12.5%和18.0%。球弧式纵向剖分超高压模具的径向位移也有利于提高压缸的保压能力,同时球弧式纵向剖分超高压模具的腔体容积也比普通年轮式模具提高了约43%。分析表明,球弧式纵向剖分结构有利于提高生产效率,增加模具的使用寿命。更多还原

【Abstract】 In order to improve the maximum bearing capacity of ordinary annual wheeled ultra-high pressure molds, a new spherical arc longitudinally split ultra-high pressure mold structure is proposed. Due to the spherical-arc structure, the circumferential tensile stress of the ultra-high pressure mold that has suffered the most damage is converted into axial stress. Then, the axial stress is reduced by the longitudinal division method, thus improving the ultimate bearing capacity of the ultra-high pressure mold cylinder.Spherical-arc longitudinal splitting of the ultra-high pressure mold can not only reduce the equivalent stress and the maximum tangential stress of the ultra-high pressure mold, but also greatly increase the cavity volume of the mold. The numerical analysis results show that: under the same load condition, the circumferential tensile stress, equivalent stress and maximum tangential stress of the spherical-type longitudinally split ultra-high pressure mold are lower than ordinary annual wheel-type ultra-high pressure molds by 68%,12.5% and 18.0%, respectively. The radial displacement of the spherical-arc longitudinally split ultra-high pressure mold is also conducive to improving the pressure-holding capacity of the cylinder,and the cavity volume of the spherical-arc longitudinally split ultra-high pressure mold is also increased by about 43% compared to that of the ordinary annual wheel mold. The analysis shows that the spherical-arc longitudinal split structure helps to improve the production efficiency and mold life.更多还原