液压顶紧器碟形弹簧不同组合型式的数值模拟与分析

Numerical Simulation and Analysis of Different Combination Types of Disc Spring in Hydraulic Tightener

为保证液压顶紧器能够提供足够的密封力,以液压顶紧器中碟形弹簧(碟簧)为研究对象,依据GB/T 1972—2005标准中的碟簧尺寸规格确定A系列碟簧组在自由高度等方面优于B、C系列;利用试验得到A系列碟簧载荷-位移特性曲线,发现碟簧在接近压平状态的80%时由于在载荷作用下截面发生弯曲其位移出现急剧增加现象,且具有正刚度;之后使用ANSYS软件对不同复合组合型式进行研究,获得碟簧组应力分布规律,碟簧组最大应力位于上表面内孔承受载荷作用处;最后对符合使用条件的不同组合型式进行应力线性化评定分析。经过综合分析,最终确定当碟簧6片叠合为一组、5组对合时是不同组合型式中综合性能最佳的,可在3600 kN密封力下安全使用。

For the sake of the hydraulic jacking device can provide enough sealing force,taking the disc spring in hydraulic de⁃vice as the research object.On the basis of the size specification of disc spring in GB/T 1972—2005,series A disc spring was superior to series B and C in free height and other factors.Meanwhile,taking into account the influence of friction,the load displacement char⁃acteristic curve of series A disc spring was obtained.It is found that the displacement of disc spring increases sharply when it is close to 80%of the flattened state due to the bending of the section under load,and it has positive stiffness.Then different number n of parallel disc springs and number i of series groups of composite disc spring combinations were studied by ANSYS and the stress distribution of the disc spring group was obtained.The maximum stress of disc spring group is located at the place where the inner hole of the upper surface under the load.After that,the stress linear evaluation of the different combinations that met the service conditions were ana⁃lyzed.It is finally determined that when 6 pieces of disc spring are stacked into a group and 5 groups are paired has the better perform⁃ance and can be safely used under 3600 kN sealing force.