梯形螺纹的有关计算

dP良好润滑稀有润滑在介质中10青铜黄铜铸铁0.150.170.20～0.2512刚0.20.250.30～0.3514多层纤维塑料0.10.12-16182020℃120℃225℃300℃22耐酸钢-黄铜0.30.3524耐酸钢-青铜0.250.280.280.3426高铬钢-黄铜（Gr17Ni2)0.330.3528高铬钢-青铜（Gr17Ni2)0.280.280.290.3730铬不锈钢-黄铜0.30.3732铬不锈钢-青铜0.250.30.30.3436碳钢-黄铜0.320.3740碳钢-青铜0.270.310.330.364440铬钢-黄铜0.320.374840铬钢-青铜0.270.310.330.365052螺纹公称直径d555155螺纹牙距P82.85845952260摩擦系数fL0.150.2565摩擦角σL8.5307656114.0362434770摩擦半径RFM5.1367116895.03886165275内螺纹小径D1475680螺纹牙顶间隙ac0.54685螺纹的力臂XL2.5640.884901390螺杆单牙螺纹断面系数W633.0747177747.566953995螺杆单牙螺纹受剪面积AJ771.6562381939.407594210011012016材料ZCuAl10Fe3Mn2公称压力P32阀体密封面内径DMN1920.25密封面宽度bm12密封机构的重量MG10010密封面材料2密封面必须比压qMF32.40.1阀杆直径dF55单圈填料高度h1076026.54螺纹计算高度101计算螺纹的圈数n10.62530螺纹的许用剪应力[τ]50855127.08249176.05254303.1366350.44205952.762579329.9955205952.762530.2520.6364.82σZY[σZY]、τ[τ]、σW[σW]校核不满足要求螺纹弯曲应力σWFFZXL/nW＇Mpa关闭时阀杆总轴向力FFZ＇挤压应力σZYFFZ/nAYMpaFMJ+FMFN剪应力τFFZ/nAJ＇Mpa阀杆最大轴向力FFZMAX(FFZ＇，FFZ）N二、螺纹部分的校核螺纹的许用挤压应力[σZY]开启时阀杆总轴向力FFZfMFMZ+Fp+FTfM＇FMZ-Fp+FTNN填料与阀杆的摩擦力计算FTπdFh1Z11.2PfN密封面上总作用力FMZ密封面上密封力FMF一、阀体密封面上总作用力的计算π（DMN+bm)bmqMFN关闭阀门时密封面摩擦系数fM介质作用力FMJπ/4（DMN+bm)2PN填料与阀杆摩擦系数填料圈数Z摩擦系数fL＇阀杆径向截面上总作用力Fp螺纹的许用弯曲应力[σW]螺母单牙螺纹断面系数W＇螺母单牙螺纹受剪面积AJ＇单牙螺纹受挤压面积AYRFM＇内螺纹大径D4外螺纹小径d3梯形螺纹强度校核345摩擦角ρL＇阀杆材料螺母材料摩擦系数fL一、梯形螺纹的有关参数及其确定螺纹中径d2螺纹升角αL126810具有润滑条件下的螺纹的摩擦系数各种温度下干摩擦螺纹的最大摩擦系数螺纹材料摩擦系数fL＇钢梯形螺纹公称直径与螺距