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    • 35. 发明专利
    • PIPE BENDING MACHINE
    • JPS56119626A
    • 1981-09-19
    • JP2052180
    • 1980-02-22
    • HITACHI LTD
    • UCHIDA FUMIHIKOSATOU KAZUOTAKAHASHI SOUJI
    • B21D7/025B21D9/07B21D9/16
    • PURPOSE:To correct a mandrel to an optimum position and improve the yield of products by inserting a mandrel into a pipe, and detecting the axial load fluctuations of the mandrel during bending the pipe. CONSTITUTION:The load curve 14 of the load applied axially upon a mandrel 1 obtained by a bending machine 13 during bending of a pipe 2 is A/D converted 15 and the values thereof are compared with the values of the master curve written in an ROM16. An alarm for insufficient lubrication is emitted when the tension larger as compared to the master curve is detected, that for the position deviation of the mandrel 1 when the maximum compressive load changes sharply, and that for the occurrence of creasing when the load curve changes like waves. The fluctuations from optimum working conditions obtained from the results of this detection are fed back to the pipe bending machine 13, whereby lubrication or the position of the mandrel 1 is corrected to optimum conditions.