>> P.300
3-6수명계산식정격수명은다음식으로계산합니다.리니어웨이의경우L=50(C—P)3.......................................................................................................(1)리니어롤러웨이의경우L=50(C—P)10/3..................................................................................................(2)여기서L:정격수명103mC:기본동정격하중NP:동등가하중N따라서,스트로크길이와분당왕복횟수가주어지면수명시간은다음식에서산출할수있습니다.Lh=106L2Sn1×60.............................................................................(3)여기서Lh:시간으로나타낸정격수명hS:스트로크길이mmn1:분당왕복횟수min-1하중계수직동안내기기에작용하는하중은기계의진동과충격등에따라이론하중보다커집니다.일반적으로표1의하중계수를곱하여부하하중을구합니다.표1하중계수운전조건fW충격없는원활한운전시1~1.2보통운전시1.2~1.5충격하중동반운전시1.5~3정적안전계수일반적으로기본정정격하중및정정격모멘트를정상적인구름운동을하는허용한계의하중으로생각하고있으나,직동안내기기의사용조건과직동안내기기에요구되는성능에따라정적안전계수를검토할필요가있습니다.정적안전계수는다음식으로구하며,일반적인값이표2.1,표2.2에나와있습니다.또한(5)식은모멘트에대한대표식입니다.각각의방향의모멘트와정정격모멘트를대응시켜서산출합니다.fS=C0—P0..............................................................................................................(4)fS=T0—M0..............................................................................................................(5)여기서fS:정적안전계수C0:기본정정격하중NP0:정등가하중NT0:정정격모멘트N·mM0:각의방향의모멘트N·m(최대모멘트)표2.1리니어웨이의정적안전계수사용조건fs진동,충격이있을때3~5높은주행성능을요구할때2~4보통운전조건시1~3표2.2리니어롤러웨이의정적안전계수사용조건fs진동,충격이있을때4~6높은주행성능을요구할때3~5보통운전조건시2.5~3
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