Ultrasonic inspection method and defect detection method for rolling bearing
A rolling bearing and ultrasonic technology, which is applied in mechanical bearing testing, using sound waves/ultrasonic waves/infrasonic waves to analyze solids, using sound waves/ultrasonic waves/infrasonic waves for material analysis, etc., can solve problems affecting rolling fatigue life, etc.
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no. 1 approach
[0156] First, the present invention will be described with reference to the structure of the ultrasonic flaw detector of the present embodiment.
[0157] FIG. 1 is an overall block diagram of an ultrasonic flaw detector according to an embodiment of the present invention, and FIGS. 2 and 3 are partially enlarged views.
[0158]In FIG. 1, reference numeral 1 denotes a bath in which kerosene or another liquid hydrocarbon is stored as an ultrasonic transmission medium. In the present embodiment, kerosene is used as the liquid hydrocarbon 2, and a rust inhibitor is added to the kerosene. The outer ring 4 of the bearing and the jig 3 are provided at a lower position inside the bath 1 . A fitting portion 3a capable of fitting the outer ring 4 of the bearing with its axis vertically oriented is provided in the upper portion of the jig 3, and the jig 3 is rotationally driven by a motor 5 about a rotation axis concentric with the bearing axis. The motor 5 is controlled by a controlle...
no. 2 approach
[0199] A second embodiment will now be described with reference to these drawings. Elements similar to those of the first embodiment will be described while being assigned the same reference numerals.
[0200] In terms of productivity, flaw detection should start as early as possible. Meanwhile, when the time since immersion in the workpiece elapses very quickly, the effect of removing air bubbles or dust becomes insufficient, and spurious noise due to air bubbles or the like frequently occurs. Therefore, demands for productivity and demands for preventing noise arise. An inspection method for reducing noise in a series of operations for inspecting a workpiece by immersing it in a medium and transporting the workpiece immediately after conducting a pass / fail test is desired as an ultrasonic inspection method for satisfying these requirements.
[0201] The present inventors conducted considerable research on shortening the inspection time and improving the inspection accuracy...
no. 1 example
[0208] The current embodiment relates to the performance of ultrasonic flaw detection by using an ultrasonic flaw detector such as the above: by combining an inspection process for ultrasonic detection of cracks after a finishing process in a bearing production process, and using liquid hydrocarbon as a medium.
[0209] FIG. 4 shows an exemplary procedure of the procedure when performing ultrasonic flaw detection of the present embodiment.
[0210] For comparison, Table 1 shows Conventional Example 1 in which ultrasonic flaw detection was performed after round bar (forging) processing (see arrow A), Conventional Example 2 in which ultrasonic flaw detection was performed after heat treatment (see arrow B), in which Comparison results between conventional Example 3 in which ultrasonic flaw detection was performed after grinding (see arrow C) during the use of a water-based medium as the medium, and the first embodiment of the present invention.
[0211] Table 1
[0212] ...
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Abstract
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