Patent ID: 8844364
Filing Date: 2014-09-30
Classification: F02P,F16B,G01L,H01T

Abstract:
1. A method for conducting quality control of a screw component, the method being a method for previously managing a phase position in a rotational direction when a screw component having a sealing portion that demonstrates a sealing function by plastic deformation is tightened to a corresponding screw portion with a specified torque value, wherein a management torque value lower than the specified torque value is previously determined, wherein a gauge having a screw portion that is capable of being screwed on the screw component is prepared, wherein there are previously each determined upper and lower limit positions of a tolerance of the phase position in the rotational direction in the screw component, when the screw component and the gauge are screwed together and tightened with the management torque value, wherein it is judged as a non-defective product in case that a reference portion at the phase position in the rotational direction in the screw component is within a range of the upper and lower limit positions of the tolerance, and it is judged as a defective product in case that the reference portion at the phase position in the rotational direction is not within a range of the upper and lower limit positions of the tolerance, when the screw component and the gauge are screwed together and tightened with the management torque value is evaluated.