Abstract: The present invention provides a method for measuring an end portion shape of a threaded pipe or tube P, the method including: a thread axis detection step; a laser light positioning step; a laser light image capture step; and a shape calculation step. In the laser light positioning step, the light source 1 and the image capture device 2 are moved together so that: the optical axis LA of the light source is located so as to pass through a measurement point D (X1, Y1, Z1) on the thread axis A, the measurement point being located in the measurement target region within a plane NP including the thread axis; and the laser light L extends in a slit-like form within the plane.

Abstract: The present invention provides a method for automatically measuring a thread element at an end portion of a pipe or tube P after thread processing, on a thread processing line 100 in which thread processing is performed on the end portion of each pipe or tube P which is successively conveyed, comprising: a cleaning step of cleaning the end portion of the pipe or tube by a thread cleaning apparatus 30 after the thread processing; a drying step of drying the end portion of the pipe or tube P cleaned in the cleaning step by a thread drying apparatus 40; and a measuring step of measuring the thread element at the end portion of the pipe or tube P by an automatic thread element measurement 50 after drying, wherein the end portion of the pipe or tube is put under a clean atmosphere at least in the measuring step.

Abstract: A defect inspecting apparatus includes a first light source, a first image capture device that receives the reflection light emitted from the first light source and reflected by the outer peripheral surface of a lip part to grab the image of the outer peripheral surface of the lip part, a second light source, a second image capture device 8 that receives the reflection light emitted from the second light source and reflected by a load face to grab the image of the load face, a third light source, a third image capture device that receives the reflection light emitted from the third light source and reflected by a thread bottom face inspection zone 106 to grab the image of the thread bottom face inspection zone, and an inspection device for inspecting defects by processing the captured images grabbed by the first to third image capture devices.

Abstract: The present invention provides a method for measuring an end portion shape of a threaded pipe or tube P, the method including: a thread axis detection step; a laser light positioning step; a laser light image capture step; and a shape calculation step. In the laser light positioning step, the light source 1 and the image capture device 2 are moved together so that: the optical axis LA of the light source is located so as to pass through a measurement point D (X1, Y1, Z1) on the thread axis A, the measurement point being located in the measurement target region within a plane NP including the thread axis; and the laser light L extends in a slit-like form within the plane.

Abstract: The present invention provides a method for automatically measuring a thread element at an end portion of a pipe or tube P after thread processing, on a thread processing line 100 in which thread processing is performed on the end portion of each pipe or tube P which is successively conveyed, comprising: a cleaning step of cleaning the end portion of the pipe or tube by a thread cleaning apparatus 30 after the thread processing; a drying step of drying the end portion of the pipe or tube P cleaned in the cleaning step by a thread drying apparatus 40; and a measuring step of measuring the thread element at the end portion of the pipe or tube P by an automatic thread element measurement 50 after drying, wherein the end portion of the pipe or tube is put under a clean atmosphere at least in the measuring step.

Abstract: The present invention provides a method which allows simply, easily and accurately evaluating the fastening state of shoulder parts of a threaded joint for use as a joint of pipes or tubes, such as OCTG, during fastening or after fastening. The fastening state evaluation method for a threaded joint 100 of pipes or tubes according to the present invention is characterized in that it transmits ultrasonic surface waves from the internal surface of either one of the pin 1 and the box 2 toward the internal surface of the other one of the pin 1 and the box 2 through the shoulder parts 13, 23 of the pin 1 and the box 2, and on the basis of the transmitted wave intensity or the reflected wave intensity thereof, determines whether or not the fastening state of the threaded joint 100 is satisfactory.

Abstract: A defect inspecting apparatus includes a first light source, a first image capture device that receives the reflection light emitted from the first light source and reflected by the outer peripheral surface of a lip part to grab the image of the outer peripheral surface of the lip part, a second light source, a second image capture device 8 that receives the reflection light emitted from the second light source and reflected by a load face to grab the image of the load face, a third light source, a third image capture device that receives the reflection light emitted from the third light source and reflected by a thread bottom face inspection zone 106 to grab the image of the thread bottom face inspection zone, and an inspection device for inspecting defects by processing the captured images grabbed by the first to third image capture devices.

Abstract: The present invention provides a method which allows simply, easily and accurately evaluating the fastening state of shoulder parts of a threaded joint for use as a joint of pipes or tubes, such as OCTG, during fastening or after fastening. The fastening state evaluation method for a threaded joint 100 of pipes or tubes according to the present invention is characterized in that it transmits ultrasonic surface waves from the internal surface of either one of the pin 1 and the box 2 toward the internal surface of the other one of the pin 1 and the box 2 through the shoulder parts 13, 23 of the pin 1 and the box 2, and on the basis of the transmitted wave intensity or the reflected wave intensity thereof, determines whether or not the fastening state of the threaded joint 100 is satisfactory.

Abstract: An apparatus which can thinly and uniformly apply a highly viscous lubricant on the threaded portion of a threaded joint for pipes comprises a steel pipe support unit which supports a steel pipe P having a pin while rotating the pipe, a lubricant circulation system in which a lubricant having its viscosity adjusted so as to be sprayable is circulated, a metering unit having a metering pump capable of metering the lubricant, a lubricant spraying unit having spray guns for spraying lubricant through nozzles toward the pin, a spray gun support unit which supports the spray guns so as to be movable in the axial and/or radial directions of the steel pipe P; and a controlling unit which controls the rotational speed of the steel pipe P by the steel pipe support unit and the speeds of movement of the spray guns by the spray gun support unit.