Spiral thread detection method and special instrument thereof

Abstract

The invention discloses a spiral thread detection method and a special instrument thereof, and the method comprises the steps: supporting an inner hole of a to-be-detected workpiece, coating a layer of thin mineral oil on the outer circle of a to-be-detected spiral thread, and hanging a heavy hammer through a cotton thread; enabling the to-be-detected workpiece to rotate anticlockwise, and if the cotton thread for hanging the heavy hammer does not move within one minute or the moving distance of the cotton thread along the axis is smaller than or equal to 5 mm, indicating that the to-be-detected workpiece does not have spiral threads; if the movement distance of the cotton thread along the axis is larger than 5 mm, indicating that spiral threads exist possibly, then enabling the to-be-detected workpiece to rotate clockwise, and if the cotton thread for hanging the heavy hammer moves in the reverse direction along the axis and in the forward rotation process within one minute, indicating that the to-be-detected workpiece does not have spiral threads; if the cotton thread for hanging the heavy hammer moves along the axis in the same direction as the forward rotation direction within one minute, indicating that the clamping of the to-be-detected workpiece is not horizontal, and the clamping of the to-be-detected workpiece needs to be readjusted. The special instrument is simple in structure, convenient to operate, stable, reliable and good in detection effect.

Description

technical field [0001] The invention relates to a spiral pattern detection method and a special instrument thereof, belonging to the technical field of mechanical detection. Background technique [0002] At present, during the cylindrical grinding process of the produced bearings and motor shafts, due to reasons such as vibration, excessive contact stiffness, and distortion of the geometric accuracy of the machine tool, spiral patterns will occur on the surface of the workpiece being ground by the cylindrical grinder. Occasionally, the spiral pattern can be distinguished by the naked eye, but most of them cannot be directly distinguished by the naked eye. There have been no good detection methods and equipment for many years, and only expensive precision instruments can be used for detection. The pitch and depth of the helical thread are used to determine whether the workpiece is qualified or not. The detection cost is high, but the detection efficiency is not high. Conten...

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Problems solved by technology

[0002] At present, during the cylindrical grinding process of the produced bearings and motor shafts, due to vibration, excessive contact stiffness and distortion of the geometric accuracy of the machine tool, etc. When the cylindrical grinder grinds the surface of the workpiece to produce spiral patterns, such spiral patterns can occasionally be distinguished by the naked eye, but most of them cannot be directly distinguished by the naked eye, and there have been no good detection methods and equipment for many years , can only use expensive precision instruments for testing, measure the helical moment and depth of the helical thread, and then judge whether the workpiece is qualified or not, the testing cost is high, but the testing efficiency is not high

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