Spherical ball ultrasonic flaw detection device and flaw detection method thereof

Abstract

The invention discloses a spherical ball ultrasonic flaw detection device and a flaw detection method thereof, the device comprises a probe, a base and a flaw detector, the probe is provided with a reference block, the probe is electrically connected with the flaw detector through a lead, and the probe is arranged on the base. The structure is simple, the spherical ball can be automatically centered through the arrangement of the contact edge, good propagation of ultrasonic waves is guaranteed through the design of the liquid cup and the contact edge, and the accuracy and stability of detection are improved. No blind area exists during flaw detection, and ultrasonic flaw detection can be rapidly and accurately carried out on the internal defect of the spherical ball. The detection standard of the flaw detection device is determined through the sensitivity debugging step, the quality of the spherical ball can be rapidly and accurately judged through the flaw detection step, and the detection efficiency is improved. The device and the method are suitable for detection of spherical balls of various specifications, and have wide application prospects.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of nondestructive testing, and particularly relates to a spherical ball ultrasonic flaw detection device and a flaw detection method thereof. BACKGROUND

[0002] In industrial production, the quality of spherical balls as important parts directly affects the performance and service life of equipment. Therefore, it is of great practical significance to detect the internal defects of spherical balls in time. At present, when detecting spherical ball products, the eddy current detection method is generally used, and the eddy current detection method can only detect surface or near-surface defects. The conventional portable ultrasonic detection method can only detect defects of cylindrical rollers, and it is difficult to detect internal defects of spherical balls. Therefore, a portable spherical ball internal flaw detection device and a corresponding flaw detection method are needed to improve the accuracy and efficiency of detection. SUMMARY

[0003] To solve the above technical problems, the application provides a spherical ball ultrasonic flaw detection device and a flaw detection method thereof.

[0004] The application is implemented through the following technical solutions.

[0005] The spherical ball ultrasonic flaw detection device provided by the application comprises a probe, a base and a flaw detector, a contrast test block is arranged on the probe, the probe is electrically connected to the flaw detector through wires, and the probe is arranged on the base.

[0006] Preferably, a threaded sleeve is arranged on the probe, external threads are arranged on the outer wall of the upper part of the probe, a step is arranged at the bottom of the external threads, a sealing ring is arranged on the step, the threaded sleeve is provided with internal threads, the threaded sleeve is connected to the upper part of the probe through the threads, and the contrast test block is arranged on the threaded sleeve.

[0007] Preferably, the contrast test block is spherical, and an artificial defect is arranged on the contrast test block.

[0008] Preferably, the threaded sleeve is provided with a liquid cup, the contrast test block is arranged in the liquid cup, and the liquid cup is in communication with the inner cavity of the threaded sleeve.

[0009] Preferably, a rounded contact edge is arranged at the joint of the liquid cup and the inner cavity of the threaded sleeve.

[0010] Preferably, the distance H between the contact edge and the top of the external threads of the threaded sleeve is greater than D / 4, and D is the diameter of the contrast test block.

[0011] Preferably, a balance hole is arranged in the inner cavity of the threaded sleeve, and the balance hole is in communication with the inner cavity of the threaded sleeve and the liquid cup.

[0012] Preferably, a piezoelectric wafer is arranged on the top of the probe, and a connector is arranged on the probe, and the piezoelectric wafer is electrically connected with the connector.

[0013] Preferably, a blind hole is arranged on the base, and a wire groove is arranged on one side of the blind hole.

[0014] A detection method of a spherical ball ultrasonic flaw detection device, comprising a detection device sensitivity adjustment step and a detection step, The detection device sensitivity adjustment step comprises: A1: adjusting the sensitivity of the detection device: injecting coupling liquid into a liquid cup, and placing a contrast test block on the contact line in the liquid cup; A2: rotating the contrast test block so that the artificial defect is not on the vertical line of the liquid cup, and the artificial defect is above the coupling liquid, adjusting the detection instrument parameters, and moving the contrast test block, observing the wave pattern of the detection instrument, and making the detection bottom wave of the intact part of the contrast test block at the highest position of the first mark point in the wave pattern of the detection instrument, and then adjusting the bottom wave height to 80% of the full screen of the wave pattern of the detection instrument; A3: again, the artificial defect is located on the vertical line of the liquid cup, and the bottom wave height at the first mark point position in the wave pattern is adjusted to be lower than 60% of the full screen of the wave pattern; The detection step comprises: The contrast test block is taken out, the spherical ball to be detected is placed on the contact line in the liquid cup, the spherical ball to be detected is moved from different directions, and the bottom wave height displayed at the first mark point position is observed; if the bottom wave height is not lower than 60% of the full screen of the wave pattern, the quality is qualified, otherwise, the quality is unqualified.

[0015] The beneficial effects of the present application are: 1. The present application has a simple structure, and the spherical ball can be automatically centered through the arrangement of the contact line, the design of the liquid cup and the contact line ensures good propagation of ultrasonic waves, and improves the accuracy and stability of detection. The present application has no blind area during detection, and can quickly and accurately detect internal defects of the spherical ball.

[0016] 2. The detection method of the present application is simple and easy to operate, the detection standard of the detection device is determined through the sensitivity adjustment step, the quality of the spherical ball can be quickly and accurately judged through the detection step, and the detection efficiency is improved. The device and method are suitable for detection of various specifications of spherical balls, and have wide application prospects. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic diagram of the present application; Figure 2 is a top view schematic diagram of the base of the present application; Figure 3is a structural schematic diagram of the probe of the present application; Figure 4 is a structural schematic diagram of the sleeve of the present application; Figure 5 is a normal waveform diagram of the detection contrast test block of the present application; Figure 6 is a waveform diagram of the detection contrast test block of the present application; In the figure: 1-contrast test block, 2-artificial defect, 3-external thread, 4-probe, 5-base, 6-flaw detector, 7-wire, 8-sealing ring, 9-internal thread, 10-sleeve, 11-coupling liquid, 12-balance hole, 13-piezoelectric wafer, 14-blind hole, 15-wire groove, 16-joint, 17-contact edge, 18-liquid cup, 19-first mark point. DETAILED DESCRIPTION

[0018] The technical solutions of the present application are described further below, but the scope of protection is not limited to the description.

[0019] Embodiment: As Figures 1 to 6 shown, a spherical ball ultrasonic flaw detection device includes a probe 4, a base 5 and a flaw detector 6, the probe 4 is provided with a contrast test block 1, the probe 4 is electrically connected with the flaw detector 6 through a wire 7, the probe 4 is arranged on the base 5, and the base 5 provides stable support for the entire device.

[0020] The probe 4 is provided with a sleeve 10, the sleeve 10 is made of soft aluminum alloy, an external thread 3 is arranged on the upper wall of the probe 4, a step is arranged at the bottom of the external thread 3, a sealing ring 8 is arranged on the step, the sleeve 10 is provided with an internal thread 9, the sleeve 10 is threadedly connected with the upper part of the probe 4, and the contrast test block 1 is arranged on the sleeve 10. The arrangement makes the sleeve 10 more convenient to install and dismount, and the sealing ring 8 can ensure the sealing of the connection part and prevent the coupling liquid 11 from leaking.

[0021] The contrast test block 1 is spherical, an artificial defect 2 is arranged on the contrast test block 1, the spherical contrast test block 1 is arranged with the artificial defect 2 on the central axis of the center, the artificial defect 2 is a flat-bottom hole, the flat-bottom hole is arranged to facilitate the standardization of the artificial defect 2, if a natural defect is used, the size is difficult to control, and if a groove is used to manufacture the defect, there is no reflection echo during ultrasonic detection. The arrangement of the artificial defect 2 can simulate the actual defect that may occur in the spherical ball and provide a standard for the sensitivity adjustment of the flaw detection device.

[0022] The sleeve 10 is provided with a liquid cup 18, the contrast test block 1 is arranged in the liquid cup 18, and the liquid cup 18 is in communication with the inner cavity of the sleeve 10.

[0023] The liquid cup 18 and the inner cavity of the sleeve 10 are communicated at the joint of the reverse rounded contact edge 17, which makes the contact between the contrast test block 1 and the liquid cup 18 more stable, and is beneficial to the propagation of ultrasonic waves.

[0024] The distance H between the contact edge 17 and the top of the external thread 3 of the sleeve 10 is greater than D / 4, and H is 7 mm. The size requirement of H is to ensure that the primary bottom wave is in front of the secondary interface wave, which is beneficial to detection. D is the diameter of the contrast test block 1, and D is 20 mm.

[0025] The inner cavity of the sleeve 10 is provided with a balance hole 12, which communicates the inner cavity of the sleeve 10 with the liquid cup 18. The balance hole 12 can balance the pressure inside and outside the liquid cup 18, ensure that the coupling liquid 11 can be filled smoothly, and avoid affecting the detection results due to pressure difference.

[0026] The top of the probe 4 is provided with a piezoelectric wafer 13, and the probe 4 is provided with a connector 16. The piezoelectric wafer 13 is electrically connected with the connector 16. The piezoelectric wafer 13 is a key component for transmitting and receiving ultrasonic waves, and is connected with the flaw detector 6 through the connector 4 to realize signal transmission.

[0027] The base 5 is provided with a blind hole 14, and one side of the blind hole 14 is provided with a wire groove 15. The blind hole 14 can be used to place the probe 4. The probe 4 is in clearance fit with the blind hole 14, which plays a role in fixing and protecting the probe 4. The wire groove 15 facilitates the arrangement of the connector 16 and the wire 7, so that the wire 7 can pass out from one side of the base 5, avoiding messy entanglement of the wire 7. A flaw detection method of a spherical ball ultrasonic flaw detection device, comprising a flaw detection device sensitivity adjustment step and a flaw detection step, The flaw detection device sensitivity adjustment step is: A1: Adjust the sensitivity of the flaw detection device: inject the coupling liquid 11, which is lubricating oil, into the liquid cup 18, and place the contrast test block 1 on the contact edge 17 in the liquid cup 18; A2: Rotate the contrast test block 1 so that the artificial defect 2 is not on the vertical line of the liquid cup 18, and the artificial defect 2 is located above the coupling liquid 11. Adjust the parameters of the flaw detector 6, and turn the contrast test block 1. Observe the waveform diagram of the flaw detector 6, so that the detection bottom wave of the intact part of the contrast test block 1 is located at the first mark point 19 position in the waveform diagram of the flaw detector 6, as shown by the red line. Figure 5 Then adjust the bottom wave height to 80% of the full screen of the waveform diagram of the flaw detector 6. This step is to determine the normal signal strength of the flaw detection device under the condition of no defect; A3: Again, the artificial defect 2 is located on the vertical line of the liquid cup 18, and the artificial defect 2 is located above the coupling liquid 11. Turn the contrast test block 1, so that the first mark point 19 is located in the waveform diagram, as shown by the red line. Figure 6As shown by the red line, the lowest bottom wave height at the position is lower than 60% of the full screen of the wave chart. Through this step, the detection sensitivity of the flaw detection device to defects can be determined. The flaw detection step is: The contrast test block 1 is taken out, the spherical ball to be detected is placed on the contact along 17 in the liquid cup 18, the spherical ball to be detected is moved in different directions, and the bottom wave height displayed at the position of the first mark point 19 is observed. If the bottom wave height is not lower than 60% of the full screen of the wave chart, the quality is qualified, otherwise, the quality is unqualified. Through comparison of the bottom wave height and the set threshold value, whether the spherical ball has defects can be quickly and accurately judged.

Claims

1. A spherical ball bearing ultrasonic flaw detection device, characterized in that: It includes a probe (4), a base (5) and a flaw detector (6). A comparison test block (1) is set on the probe (4). The probe (4) is electrically connected to the flaw detector (6) through a wire (7). The probe (4) is set on the base (5).

2. The spherical ball ultrasonic flaw detection device as described in claim 1, characterized in that: The probe (4) is provided with a screw sleeve (10), the upper outer wall of the probe (4) is provided with an external thread (3), the bottom of the external thread (3) is provided with a step, and a sealing ring (8) is provided on the step. The screw sleeve (10) is provided with an internal thread (9), and the screw sleeve (10) is threadedly connected to the upper part of the probe (4). The comparison test block (1) is provided on the screw sleeve (10).

3. The spherical ball ultrasonic flaw detection device as described in claim 2, characterized in that: The comparison test block (1) is spherical, and an artificial defect (2) is provided on the comparison test block (1). The artificial defect (2) is a flat-bottomed hole.

4. The spherical ball ultrasonic flaw detection device as described in claim 2, characterized in that: A liquid cup (18) is provided on the threaded sleeve (10), and the comparison test block (1) is placed inside the liquid cup (18). The liquid cup (18) is connected to the inner cavity of the threaded sleeve (10).

5. The spherical ball ultrasonic flaw detection device as described in claim 4, characterized in that: The liquid cup (18) and the inner cavity of the screw sleeve (10) are connected by a rounded contact edge (17).

6. The spherical ball ultrasonic flaw detection device as described in claim 5, characterized in that: The distance H between the contact edge (17) and the top of the external thread (3) on the sleeve (10) is greater than D / 4, where D is the diameter of the comparison test block (1).

7. The spherical ball ultrasonic flaw detection device as described in claim 5, characterized in that: The inner cavity of the threaded sleeve (10) is provided with a balance hole (12), which connects the inner cavity of the threaded sleeve (10) with the liquid cup (18).

8. The spherical ball ultrasonic flaw detection device as described in claim 1, characterized in that: The probe (4) is provided with a piezoelectric crystal (13) on top and a connector (16) on the probe (4). The piezoelectric crystal (13) and the connector (16) are electrically connected.

9. The spherical ball ultrasonic flaw detection device as described in claim 1, characterized in that: A blind hole (14) is provided on the base (5), and a wire groove (15) is provided on one side of the blind hole (14).

10. A flaw detection method for a spherical ball ultrasonic flaw detection device as described in any one of claims 1-9, characterized in that, This includes the sensitivity adjustment steps for the flaw detection device and the flaw detection steps. The sensitivity adjustment steps for the flaw detection device include: A1: Adjust the sensitivity of the flaw detection device: Inject coupling liquid (11) into liquid cup (18), and place the comparison test block (1) on the contact edge (17) in liquid cup (18); A2: Rotate the comparison test block (1) so that the artificial defect (2) is not on the vertical line of the liquid cup (18) and the artificial defect (2) is above the coupling liquid (11). Adjust the parameters of the flaw detector (6) and move the comparison test block (1). Observe the waveform of the flaw detector (6) so that the highest position of the detection bottom wave of the intact part of the comparison test block (1) is at the first mark point (19) in the waveform of the flaw detector (6). Then adjust the bottom wave height to 80% of the full screen of the waveform of the flaw detector (6). A3: Next, turn the orifice of the artificial defect (2) upward so that the artificial defect (2) is located on the vertical line of the liquid cup (18), and move the comparison test block (1) so that the lowest point of the bottom wave height at the first mark point (19) in the waveform diagram is lower than 60% of the full screen of the waveform diagram; The flaw detection steps include: Take out the comparison test block (1), put the ball to be tested on the contact edge (17) in the liquid cup (18), move the ball to be tested from different directions, and observe the bottom wave height displayed at the first mark point (19). If the bottom wave height is not less than 60% of the full screen of the waveform, it is considered to be of qualified quality; otherwise, it is considered to be of unqualified quality.

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