On-machine laser direct detection device for profile accuracy of oil thread and measurement method

Abstract

The invention discloses an on-machine laser direct detection device for profile accuracy of an oil thread. The device comprises a protective shell, a laser sensor, a mechanical bracket and a numerical control tool rack, wherein the laser sensor is arranged in the protective shell and is sealed by a sealing cover of the protective shell (2); the protective shell is arranged on the mechanical bracket; the mechanical bracket is arranged on a tool position of the numerical control tool rack. According to the direct detection device, the technical level and the quality level of oil thread detection are obviously increased, and the direct detection device has significant scientific research value, application value and social benefits.

Description

technical field [0001] The invention is used in the field of thread quality detection, and relates to an on-machine direct detection and feedback compensation device of a laser displacement sensor for the accuracy of the turned thread profile on a CNC lathe. Due to the size limitation of the laser displacement sensor, the patent of the invention can realize external threads and profile accuracy measurement of larger internal threads. Background technique [0002] Petroleum threads are mainly used in the connection between drill pipes and drill collars in the oil and gas drilling industry. , so it is very important to detect the profile accuracy of petroleum threads. At present, the detection of the profile accuracy of petroleum threaded parts is mainly based on contact measurement, which is divided into three categories: one is to measure the tight distance of the thread by tightening the thread gauge, which is currently used by various oilfield pipe stations to judge wheth...

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Problems solved by technology

At present, the detection of the profile accuracy of petroleum threaded parts is mainly based on contact measurement, which is divided into three categories: one is to measure the tight distance of the thread by tightening the thread gauge, which is currently used by various oilfield pipe stations to judge whether the processed threaded parts are qualified The only method, this detection method can realize two detection methods of on-machine measurement and offline measurement, but it can only detect the comprehensive parameters of the thread, and cannot complete the measurement of the profile parameters of the thread and the profile accuracy of the top and bottom of the tooth Detection and measurement are labor-intensive, and the results are easily affected by human factors; another method is to use special instruments. This detection method can measure all thread parameters except tooth angle and pitch diameter, but it can only be used in experiments. In the laboratory, the off-line detection of petroleum threads cannot be realized on-machine measurement of petroleum threads, and the measurement of internal thread parameters is not comprehensive; the third method is to use a three-coordinate measuring machine, this measurement method cannot realize on-machine detection, and Lateral resolution issues due to larger contact probe radii cannot be resolved

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