任意弯管的计算

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1、任意弯管是指任意弯曲角度和任意弯曲半径的弯管。这种弯管弯曲部分的展开长度可按下式进行计算:R0.01745R180式中L——弯曲部分的展开长度(mm)；弯曲角度（°）;圆周率;OR——弯曲半径（MM}图1-6任意弯管F面举例说明表1-1的使用方法。表1-1任意弯管计算弯曲角度半弯直长C弯曲长度L弯曲角度半弯直长C弯曲长度L10.00870.0175460.42450.802920.01750.0349470.43480.820330.02610.0524480.44520.837840.03490.0698490.45570.855250.0436

2、0.0873500.46630.872760.05240.1047510.47690.890170.06110.1222520.48770.907680.06990.1396530.49850.92509O.07870.1571540.50950.942510O.08750.1745550.52050.9599110.09620.1920560.53170.9774120.10510.2094570.54290.9948130.11390.2269580.55431.0123140.12280.2443590.56571.0297150.13160

3、.2618600.57741~0472160.14050.2793610.58901.0647170.1494O.2967620.60091.0821180.15840.3142630.61281.0996190.16730.3316640.62491.1170200.17630.3491650.63701.1345210.1853O.3665660.64941.1519220.19440.3840670.66181.1694230.20340.4014680.67451.1868240.21260.4189690.68721.2043250.22

4、160.4363700.70021.2217260.23090.4538710.71321.2392270.24000.4712720.72651.2566280.24930.4887730.73991.2741290.25870.5061740.75361.2915300.26790.5236750.76731.309031O.27730.5411760.78131.3265320.28670.5585770.79541.343933O.29620.5760780.80981.361434O.30570.5934790.82431.3788350

5、.31530.6109800.83911.3963360.32490.6283810.85401.417337O.33450.6458820.86931.431238O.34430.6632830.88471.4486390.35410.6807840.90041.4661400.36400.6981850.91631.4835410.37380.7156860.93251.5010420.38390.7330870.94841.5184430.39390.7505880.96571.5359440.40400.7679890.98271.5533

6、450.41410.7854901.0001.5708注：引用表中C、L值时，应乘以弯曲半径R。例已知图1-7中弯头的弯曲角度a=25°,弯曲半径R=500mm安装管段距转角点M的距离为91lmni取一根直管来煨制弯头,试问应如何划线？解需加工的弯管端直管段长度b=911-CR查表1-1得，当a=25°时，C=0.2216,L=0.4363;故CR为：0.2216R=0.2216X500=111mm因此，得b=911-111=800mm弯曲部分实际展开长度L=0.4363R=0.4363X500=218mm根据计算出来的直管段长度b及弯曲部分展开长

7、度L,便可进行划线。如图1-7b所示。图1—7弯管计算由上面的例子可以看出，只要弯曲角度和弯曲半径一定，利用表1—1就能很方便地进行任意角度、任意弯曲半径的弯管计算。而在热煨时，其加热管段长度一般应比弯曲长度稍长一些，以便保证弯曲部分加热均匀。增加的长度一般规定为：对于弯曲角度大的管子，可增加二倍管外径长度；对弯曲角度小的则增加弯曲长度的20%。