Non-destructive testing system for bonding quality of self-adhesive core

Abstract

A non-destructive self-bonded iron core bonding quality detection system, comprising an ultrasonic flaw detector and a detection processor. The ultrasonic flaw detector is used to detect the self-bonded iron core, which includes a transducer set, and the transducer set includes an upper transducer and a lower transducer respectively bonded to the upper side and the lower side of the self-bonded iron core to perform detection multiple times, and each time the upper transducer emits an ultrasonic pulse to be received by the lower transducer, so that the ultrasonic flaw detector records a plurality of amplitudes and a plurality of arrival times of the ultrasonic pulses arriving at the lower transducer for multiple times. In the detection processor, a detection value calculation module calculates the average amplitude and average arrival time corresponding to the annular region in the self-bonded iron core according to the plurality of amplitudes and the plurality of arrival times. A quality judgment module judges whether the detection item corresponding to the annular region is qualified according to the average amplitude and the average arrival time.

Claims

1. A non-destructive self-adhesive core bonding quality inspection system, comprising: an ultrasonic flaw detector for inspecting a self-adhesive core, wherein the self-adhesive core is a disc with a central hole and a thickness thereof, the ultrasonic flaw detector comprising: A transducer assembly includes an upper transducer and a lower transducer respectively attached above and below a disk to which the self-adhesive core is attached. The transducer assembly is used to perform multiple tests on an annular region of the disk, wherein each time the upper transducer emits an ultrasonic pulse perpendicular to the disk for reception by the lower transducer, so that an ultrasonic flaw detector records a plurality of amplitudes and a plurality of arrival times of the ultrasonic pulse corresponding to the annular region arriving at the lower transducer multiple times. The same test is performed on each qualified annular region of a plurality of qualified self-adhesive cores to obtain a plurality of qualified amplitudes and a plurality of qualified arrival times corresponding to the qualified annular region. A detection processor is connected to the ultrasonic flaw detector to receive the plurality of amplitudes and the plurality of arrival times. The detection processor includes: a detection value calculation module for calculating an average amplitude and an average arrival time corresponding to the annular region based on the plurality of amplitudes and the plurality of arrival times. A pass value calculation module is used to calculate an average pass amplitude and an average pass arrival time corresponding to the pass annular region of each of the plurality of pass amplitudes and the plurality of pass arrival times, average the plurality of average pass amplitudes with the plurality of pass self-adhesive cores and multiply by an amplitude pass coefficient to obtain an amplitude pass value, and average the plurality of average pass arrival times with the plurality of pass self-adhesive cores and multiply by an arrival time pass coefficient to obtain an arrival time pass value; and a quality judgment module is used to judge that the annular region is unqualified for one of the test items when the average amplitude is lower than an amplitude pass value and the average arrival time is higher than an arrival time pass value.

2. The non-destructive self-bonding core bonding quality inspection system as described in claim 1, wherein the average bonding strength of one of the plurality of qualified self-bonding cores is higher than a preset qualified value for bonding strength; when the average bonding strength is between the preset qualified value for bonding strength and a first bonding strength threshold value, the qualified value calculation module sets the amplitude qualified coefficient to be greater than 1 and the arrival time qualified coefficient to be less than 1; when the average bonding strength is higher than a second bonding strength threshold value, the qualified value calculation module sets the amplitude qualified coefficient to be less than 1 and the arrival time qualified coefficient to be greater than 1; wherein the second bonding strength threshold value is higher than the first bonding strength threshold value, and a first difference between the first bonding strength threshold value and one of the preset qualified values ​​for bonding strength is less than a second difference between the first bonding strength threshold value and one of the second bonding strength threshold values.

3. The non-destructive self-adhesive core bonding quality inspection system as described in claim 1, wherein the detection value calculation module is further used to calculate an amplitude standard deviation and an arrival time standard deviation corresponding to the annular region based on the plurality of amplitudes and the plurality of arrival times; and the quality judgment module is further used to determine that the detection item corresponding to the annular region is unqualified when at least one of the amplitude standard deviation being higher than an amplitude standard deviation qualification value and the arrival time standard deviation being higher than an arrival time standard deviation qualification value is met.

4. The non-destructive self-adhesive core bonding quality inspection system as described in claim 3, wherein the transducer group performs the same inspection on each qualified annular region of a plurality of qualified self-adhesive cores as on the self-adhesive core to obtain a plurality of qualified amplitudes and a plurality of qualified arrival times corresponding to the qualified annular region, the inspection processor further comprising: a qualification value calculation module, used to calculate a qualified amplitude standard deviation and a qualified arrival time standard deviation corresponding to the qualified annular region of each plurality of qualified self-adhesive cores based on the plurality of qualified amplitudes and the plurality of qualified arrival times, average the plurality of qualified amplitude standard deviations with the plurality of qualified self-adhesive cores and multiply by an amplitude standard deviation qualification coefficient to obtain the amplitude standard deviation qualification value, and average the plurality of qualified arrival time standard deviations with the plurality of qualified self-adhesive cores and multiply by an arrival time standard deviation qualification coefficient to obtain the arrival time standard deviation qualification value.

5. A non-destructive self-adhesive core bonding quality inspection system, comprising: an ultrasonic flaw detector for inspecting a self-adhesive core, wherein the self-adhesive core is a disc with a central hole and a thickness thereof, the ultrasonic flaw detector comprising: a plurality of transducer groups, each comprising: an upper transducer and a lower transducer, respectively engaged with the upper and lower corresponding positions of the disc of the self-adhesive core, and in a top view, the upper transducer of each plurality of transducer groups is at a different transducer distance from the center of one of the holes; Each of the plurality of transducer groups is used to perform multiple detections on a plurality of annular regions of the disk, and each time an ultrasonic pulse is emitted vertically from the upper transducer to the disk for reception by the lower transducer, so that the ultrasonic flaw detector records a plurality of amplitudes and a plurality of arrival times of the ultrasonic pulses corresponding to each plurality of annular regions arriving at the lower transducer multiple times; and a detection processor, connected to the ultrasonic flaw detector to receive the plurality of amplitudes and the plurality of arrival times, the detection processor comprising: A detection value calculation module is used to calculate the amplitude of one self-adhesive core of the self-adhesive core based on the transducer distance corresponding to each of the plurality of transducer groups and the amplitude corresponding to each of the plurality of annular regions, and to calculate the arrival time of one self-adhesive core of the self-adhesive core based on the arrival time corresponding to each of the plurality of annular regions; and a quality judgment module is used to judge that the self-adhesive core is unqualified for one of the following test items when at least one of the following conditions is met: the amplitude of the self-adhesive core is lower than an amplitude qualified value and the arrival time of the self-adhesive core is higher than an arrival time qualified value.

6. The non-destructive self-adhesive core bonding quality inspection system as described in claim 5, wherein the upper transducers of each plurality of transducer groups are arranged along a connecting line between the center of the hole and the outer edge of the disk when viewed from above.

7. The non-destructive self-bonded core bonding quality inspection system as described in claim 5, wherein each of the plurality of transducer groups performs the same inspection on a plurality of qualified annular regions of a plurality of qualified self-bonded cores as on the self-bonded core itself to obtain a plurality of qualified amplitudes and a plurality of qualified arrival times corresponding to each of the plurality of qualified annular regions in each of the plurality of qualified self-bonded cores, the inspection processor further comprising: A pass / fail value calculation module is used to calculate the amplitude of one of the multiple qualified self-adhesive cores based on the transducer distance corresponding to each of the multiple qualified transducer groups and the multiple qualified amplitudes corresponding to each of the multiple qualified annular regions in each of the multiple qualified self-adhesive cores; and to calculate the arrival time of one of the multiple qualified self-adhesive cores based on the multiple qualified arrival times corresponding to each of the multiple qualified annular regions in each of the multiple qualified self-adhesive cores. Then, the amplitude of the multiple qualified self-adhesive cores is averaged over the multiple qualified self-adhesive cores to obtain the amplitude pass / fail value, and the arrival time of the multiple qualified self-adhesive cores is averaged over the multiple qualified self-adhesive cores to obtain the arrival time pass / fail value.

8. A non-destructive self-adhesive core bonding quality inspection system, comprising: an ultrasonic flaw detector for inspecting a self-adhesive core, wherein the self-adhesive core is a disc with a central hole and a thickness thereof, the ultrasonic flaw detector comprising: a plurality of transducer groups, each comprising: an upper transducer and a lower transducer, respectively engaged with the upper and lower corresponding positions of the disc of the self-adhesive core, and in a top view, the upper transducer of each plurality of transducer groups is at a different transducer distance from the center of one of the holes; Each of the plurality of transducer groups is used to perform multiple inspections on a plurality of annular regions of the disk, and each time the upper transducer emits an ultrasonic pulse perpendicular to the disk for reception by the lower transducer, so that the ultrasonic flaw detector records a plurality of amplitudes and a plurality of arrival times of the ultrasonic pulses corresponding to each of the plurality of annular regions arriving at the lower transducer multiple times; and a detection processor, connected to the ultrasonic flaw detector to receive the plurality of amplitudes and the plurality of arrival times, the detection processor comprising: a detection value calculation module for calculating an average amplitude and an average arrival time corresponding to each of the plurality of annular regions based on the plurality of amplitudes and the plurality of arrival times; and a quality judgment module for determining whether the self-adhesive core is qualified based on the average amplitude and the average arrival time using a self-adhesive core classifier.

9. A non-destructive self-adhesive core bonding quality inspection system as described in any one of claims 1, 5 and 8, wherein the hole in the self-adhesive core is carried by a rotating shaft of a test rotating table, such that the test rotating table rotates the self-adhesive core one revolution without the upper and lower transducers rotating, and the upper transducer emits the ultrasonic pulse for each angle the self-adhesive core rotates.

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