CN103592368B - The water immersion ultrasonic phased-array detection method of disc part of aero-engine - Google Patents
The water immersion ultrasonic phased-array detection method of disc part of aero-engine Download PDFInfo
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Abstract
The invention belongs to field of non destructive testing, relate to a kind of water immersion ultrasonic phased-array pick-up unit and detection method of disc part of aero-engine.Water immersion ultrasonic phased-array pick-up unit of the present invention, comprise one by flaw detection tank (1), turntable (2), switch board (3), three-dimensional moving device (4), reflectoscope, computer for controlling (6), probe gripper (7) and ultrasonic probe, it is characterized in that: said reflectoscope is ultrasonic phase array defectoscope (5), said ultrasonic probe is ring battle array ultrasonic phase array probe (8).Detection method, the step of detection is as follows: system connects; Obtain and record ultrasound echo signal.Present invention, avoiding and frequently change probe, improve detection efficiency.
Description
Technical field
The invention belongs to field of non destructive testing, relate to a kind of water immersion ultrasonic phased-array pick-up unit and detection method of disc part of aero-engine.
Background technology
The turbine disk is the important crucial hot-end component of aeromotor, along with the development of high thrust-weight ratio, high power to weight ratio engine, has higher requirement to turbine disk obdurability, fatigue behaviour, reliability and permanance.Most diskware, particularly some high temperature alloy diskwares need to work under high temperature, top load, and this just requires that it has the ability still keeping higher usability in severe condition.And because material itself is to the susceptibility of defect, the existence of the little defect such as snotter will have a strong impact on the security of diskware use.Can reliably detect that small size inclusion defect becomes the key of diskware safe and reliable operation, therefore Dynamic Non-Destruction Measurement be considered to one of the important means and gordian technique of diskware quality control.Owing to requiring the flaw size detected very little in most diskware, manual detection is very easily undetected, so the general water logging C that adopts scans automatic checkout system at present, according to probe acoustic beam diameter, regulation scans stepping-in amount accordingly, carries out automated imaging detection.Because focusing probe has higher sensitivity for the detection of little defect, need to take the type of focusing so diskware automated imaging detects.But Problems existing is, the burnt section length of focusing probe is limited, and the thickness range of detection is general less, and the outer sensitivity of Jiao Qu sharply declines.Therefore in order to realize the high-sensitivity detection of the larger diskware of thickness, needing the probe adopting multiple different focal to detect different depth region, in whole sensing range, realizing the focusing of ultrasonic acoustic beam.Need frequently to change probe in testing process, cause detection efficiency to decline.
Summary of the invention
The object of the invention is: the water immersion ultrasonic phased-array pick-up unit and the detection method that propose a kind of disc part of aero-engine, to avoid frequently changing probe, improve detection efficiency.
Technical scheme of the present invention is: the water immersion ultrasonic phased-array detection method of disc part of aero-engine, based on the water immersion ultrasonic phased-array pick-up unit of a disc part of aero-engine, this water immersion ultrasonic phased-array pick-up unit comprises flaw detection tank 1, turntable 2, switch board 3, three-dimensional moving device 4, reflectoscope, computer for controlling 6, probe gripper 7 and a ultrasonic probe, turntable 2 is positioned at below the water surface of flaw detection tank 1, three-dimensional moving device 4 is positioned at the outside of flaw detection tank 1, it is X-axis that first of three-dimensional moving device 4 moves horizontally axle, the upper end of probe gripper 7 is fixed on the mobile unit of X-axis, probe gripper 7 can move horizontally along X-axis, ultrasonic probe is arranged on the lower end of probe gripper 7, detected disc part of aero-engine 9 is fixed on the upper surface of turntable 2 worktable, the perpendicular displacement axes of three-dimensional moving device 4 is Z axis, X-axis is fixed on the mobile unit of Z axis, X-axis can along Z axis vertically movement, it is Y-axis that second of three-dimensional moving device 4 moves horizontally axle, the lower end of Z axis is fixed on the mobile unit of Y-axis, Z axis can move horizontally along Y-axis, X-axis is vertical with Y-axis, the control signal input end of three-dimensional moving device 4 is connected with the three-dimensional moving device control signal output terminal of switch board 3 by cable, the position signalling output terminal of three-dimensional moving device 4 is connected with the three-dimensional moving device position signalling input end of switch board 3 by cable, the control signal input end of turntable 2 is connected with the turning table control signal output part of switch board 3 by cable, the position signalling output terminal of turntable 2 is connected with the revolving table position signal input part of switch board 3 by cable, and the bus interface of switch board 3 is connected by the bus interface of cable with computer for controlling 6, described reflectoscope is ultrasonic phase array defectoscope 5, described ultrasonic probe is ring battle array ultrasonic phase array probe 8, ultrasonic phase array defectoscope 5 ultrasound echo signal output terminal is connected with the ultrasound echo signal input end of computer for controlling 6 by cable, the probe pumping signal input end of ring battle array ultrasonic phase array probe 8 is connected with the probe pumping signal output terminal of ultrasonic phase array defectoscope 5 by cable, and the axes normal of ring battle array ultrasonic phase array probe 8 is in the upper surface of detected disc part of aero-engine 9, it is characterized in that, the step of detection is as follows:
1, system connects: ring battle array ultrasonic phase array probe 8 and disc part of aero-engine 9 to be checked are immersed in flaw detection tank 1, connects the cable of turntable 2, switch board 3, three-dimensional moving device 4, ultrasonic phase array defectoscope 5, computer for controlling 6 and ring battle array ultrasonic phase array probe 8;
2, obtain and record ultrasound echo signal:
2.1, initial position is determined: the initial angle α determining current turntable 2
1, utilize three-dimensional moving device 4 shift(ing) ring battle array ultrasonic phase array probe 8 to make its central axis be positioned at the outer circular edge of disc part of aero-engine 9, as the initial position of ring battle array ultrasonic phase array probe 8;
2.2, the time delay of ultrasonic signal emission and reception is determined:
Determine the first depth of focus δ of ring battle array ultrasonic phase array probe 8
1, δ
1=6mm ~ 12mm, ultrasonic phase array defectoscope 5 is according to the first depth of focus δ
1determine the delay time T of ring battle array ultrasonic phase array probe 8 each wafers
i, i is the sequence number of wafer on ring battle array ultrasonic phase array probe 8, i=1,2 ..., n; Delay time T
ibeing the time delay of ultrasonic signal emission, is again the time delay that ultrasonic signal receives;
2.3, the transmitting of ultrasonic signal: ultrasonic phase array defectoscope 5 is according to delay time T
iexport the probe pumping signal of each wafer respectively, the difference annular wafer in ring battle array ultrasonic phase array probe 8 is passed to by cable, annular wafer is produced in turn vibrate and send ultrasound wave, the ultrasound synthesis that finally each annular wafer sends is enter disc part of aero-engine 9 with the ultrasound wave of focusing effect;
2.4, the reception of ultrasound echo signal: the ultrasound wave with focusing effect enters disc part of aero-engine 9, reflection through defect or disc part of aero-engine 9 itself returns ring battle array ultrasonic phase array probe 8, annular wafer in ring battle array ultrasonic phase array probe 8 is vibrated, vibration is converted into electric signal by cable transmission to ultrasonic phase array defectoscope 5 by annular wafer, ultrasonic phase array defectoscope 5 receives the electric signal that each wafer returns, and according to the delay time T that ultrasonic signal receives
iall electric signal passed back are synthesized ultrasound echo signal ζ
1pass to computer for controlling 6;
2.5, the second depth of focus δ of ring battle array ultrasonic phase array probe 8 is determined
2, δ
2=δ
1+ 12mm, then repeats step 2.2 ~ step 2.4, makes second depth of focus of focusing ultrasonic wave in disc part of aero-engine 9, obtain the ultrasound echo signal ζ under second depth of focus
2;
2.6, repeat step 2.5, repeat to make the depth of focus increase progressively 12mm at every turn, until the recruitment of the depth of focus is less than 12mm, obtain m ultrasound echo signal ζ altogether
j, j=1,2 ..., m, each ultrasound echo signal is corresponding with a depth of focus;
2.7, after changing the angle of turntable 2, obtain and record ultrasound echo signal: utilize turntable 2 to make the relative center of circle of disc part of aero-engine 9 along clockwise or rotate counterclockwise angle delta α, Δ α=0.1 ° ~ 1 °, repeat step 2.2 ~ step 2.6, turntable 2 obtains ultrasound echo signal, until have rotated a circle;
2.8, after changing the position of ring battle array ultrasonic phase array probe 8, obtain and record ultrasound echo signal: utilize three-dimensional moving device 4 control loop battle array ultrasonic phase array probe 8 along the diametric(al) displacement Δ x of disc part of aero-engine 9, Δ x=0.1mm ~ 1mm, repeat step 2.2 ~ step 2.7, until ring battle array ultrasonic phase array probe 8 moves to inner port edge by the outer circular edge of disc part of aero-engine 9.
Advantage of the present invention is: the water immersion ultrasonic phased-array pick-up unit and the detection method that propose a kind of disc part of aero-engine, avoid and frequently change probe, improve detection efficiency.One embodiment of the present of invention, detect through reality and prove, detection efficiency improves more than 3 times.
Accompanying drawing explanation
Fig. 1 is the structural principle block diagram of the water immersion ultrasonic phased-array device of aeromotor disk-like accessory of the present invention.
Embodiment
Below the present invention is described in further details.See Fig. 1, the water immersion ultrasonic phased-array pick-up unit of disc part of aero-engine, comprises flaw detection tank 1, turntable 2, switch board 3, three-dimensional moving device 4, reflectoscope, computer for controlling 6, probe gripper 7 and a ultrasonic probe, turntable 2 is positioned at below the water surface of flaw detection tank 1, three-dimensional moving device 4 is positioned at the outside of flaw detection tank 1, it is X-axis that first of three-dimensional moving device 4 moves horizontally axle, the upper end of probe gripper 7 is fixed on the mobile unit of X-axis, probe gripper 7 can move horizontally along X-axis, ultrasonic probe is arranged on the lower end of probe gripper 7, detected disc part of aero-engine 9 is fixed on the upper surface of turntable 2 worktable, the perpendicular displacement axes of three-dimensional moving device 4 is Z axis, X-axis is fixed on the mobile unit of Z axis, X-axis can along Z axis vertically movement, it is Y-axis that second of three-dimensional moving device 4 moves horizontally axle, the lower end of Z axis is fixed on the mobile unit of Y-axis, Z axis can move horizontally along Y-axis, X-axis is vertical with Y-axis, the control signal input end of three-dimensional moving device 4 is connected with the three-dimensional moving device control signal output terminal of switch board 3 by cable, the position signalling output terminal of three-dimensional moving device 4 is connected with the three-dimensional moving device position signalling input end of switch board 3 by cable, the control signal input end of turntable 2 is connected with the turning table control signal output part of switch board 3 by cable, the position signalling output terminal of turntable 2 is connected with the revolving table position signal input part of switch board 3 by cable, the bus interface of switch board 3 is connected by the bus interface of cable with computer for controlling 6, it is characterized in that: described reflectoscope is ultrasonic phase array defectoscope 5, described ultrasonic probe is ring battle array ultrasonic phase array probe 8, ultrasonic phase array defectoscope 5 ultrasound echo signal output terminal is connected with the ultrasound echo signal input end of computer for controlling 6 by cable, the probe pumping signal input end of ring battle array ultrasonic phase array probe 8 is connected with the probe pumping signal output terminal of ultrasonic phase array defectoscope 5 by cable, the axes normal of ring battle array ultrasonic phase array probe 8 is in the upper surface of detected disc part of aero-engine 9.
The water immersion ultrasonic phased-array detection method of disc part of aero-engine, based on the water immersion ultrasonic phased-array pick-up unit of disc part of aero-engine recited above, it is characterized in that, the step of detection is as follows:
1, system connects: ring battle array ultrasonic phase array probe 8 and disc part of aero-engine 9 to be checked are immersed in flaw detection tank 1, connects the cable of turntable 2, switch board 3, three-dimensional moving device 4, ultrasonic phase array defectoscope 5, computer for controlling 6 and ring battle array ultrasonic phase array probe 8;
2, obtain and record ultrasound echo signal:
2.1, initial position is determined: the initial angle α determining current turntable 2
1, utilize three-dimensional moving device 4 shift(ing) ring battle array ultrasonic phase array probe 8 to make its central axis be positioned at the outer circular edge of disc part of aero-engine 9, as the initial position of ring battle array ultrasonic phase array probe 8;
2.2, the time delay of ultrasonic signal emission and reception is determined:
Determine the first depth of focus δ of ring battle array ultrasonic phase array probe 8
1, δ
1=6mm ~ 12mm, ultrasonic phase array defectoscope 5 is according to the first depth of focus δ
1determine the delay time T of ring battle array ultrasonic phase array probe 8 each wafers
i, i is the sequence number of wafer on ring battle array ultrasonic phase array probe 8, i=1,2 ..., n; Delay time T
ibeing the time delay of ultrasonic signal emission, is again the time delay that ultrasonic signal receives;
2.3, the transmitting of ultrasonic signal: ultrasonic phase array defectoscope 5 is according to delay time T
iexport the probe pumping signal of each wafer respectively, the difference annular wafer in ring battle array ultrasonic phase array probe 8 is passed to by cable, annular wafer is produced in turn vibrate and send ultrasound wave, the ultrasound synthesis that finally each annular wafer sends is enter disc part of aero-engine 9 with the ultrasound wave of focusing effect;
2.4, the reception of ultrasound echo signal: the ultrasound wave with focusing effect enters disc part of aero-engine 9, reflection through defect or disc part of aero-engine 9 itself returns ring battle array ultrasonic phase array probe 8, annular wafer in ring battle array ultrasonic phase array probe 8 is vibrated, vibration is converted into electric signal by cable transmission to ultrasonic phase array defectoscope 5 by annular wafer, ultrasonic phase array defectoscope 5 receives the electric signal that each wafer returns, and according to the delay time T that ultrasonic signal receives
iall electric signal passed back are synthesized ultrasound echo signal ζ
1pass to computer for controlling 6;
2.5, the second depth of focus δ of ring battle array ultrasonic phase array probe 8 is determined
2, δ
2=δ
1+ 12mm, then repeats step 2.2 ~ step 2.4, makes second depth of focus of focusing ultrasonic wave in disc part of aero-engine 9, obtain the ultrasound echo signal ζ under second depth of focus
2;
2.6, repeat step 2.5, repeat to make the depth of focus increase progressively 12mm at every turn, until the recruitment of the depth of focus is less than 12mm, obtain m ultrasound echo signal ζ altogether
j, j=1,2 ..., m, each ultrasound echo signal is corresponding with a depth of focus;
2.7, after changing the angle of turntable 2, obtain and record ultrasound echo signal: utilize turntable 2 to make the relative center of circle of disc part of aero-engine 9 along clockwise or rotate counterclockwise angle delta α, Δ α=0.1 ° ~ 1 °, repeat step 2.2 ~ step 2.6, turntable 2 obtains ultrasound echo signal, until have rotated a circle;
2.8, after changing the position of ring battle array ultrasonic phase array probe 8, obtain and record ultrasound echo signal: utilize three-dimensional moving device 4 control loop battle array ultrasonic phase array probe 8 along the diametric(al) displacement Δ x of disc part of aero-engine 9, Δ x=0.1mm ~ 1mm, repeat step 2.2 ~ step 2.7, until ring battle array ultrasonic phase array probe 8 moves to inner port edge by the outer circular edge of disc part of aero-engine 9.
Embodiment 1, detects certain type aeromotor grade low-pressure compressor dish.
Turntable 2 in the water immersion ultrasonic phased-array device of aeromotor disk-like accessory of the present invention, three-dimensional moving device 4, ultrasonic phase array defectoscope 5, computer for controlling 6 and ring battle array ultrasonic phase array probe 8 is finished parts.The outside diameter of diskware is 580mm, and thickness is 80mm, and the step of detection is:
1, system connects: ring battle array ultrasonic phase array probe 8 and disc part of aero-engine 9 to be checked are immersed in flaw detection tank 1, connects the cable of turntable 2, switch board 3, three-dimensional moving device 4, ultrasonic phase array defectoscope 5, computer for controlling 6 and ring battle array ultrasonic phase array probe 8;
2, obtain and record ultrasound echo signal:
2.1, initial position is determined: the initial angle 0 ° determining current turntable 2, three-dimensional moving device 4 shift(ing) ring battle array ultrasonic phase array probe 8 is utilized to make its central axis be positioned at the outer circular edge of disc part of aero-engine 9, as the initial position of ring battle array ultrasonic phase array probe 8;
2.2, the time delay of ultrasonic signal emission and reception is determined:
Determine the first depth of focus δ of ring battle array ultrasonic phase array probe 8
1, δ
1=8mm, ultrasonic phase array defectoscope 5 is according to the first depth of focus δ
1determine the delay time T of ring battle array ultrasonic phase array probe 8 each wafers
i;
2.3, the transmitting of ultrasonic signal: ultrasonic phase array defectoscope 5 is according to delay time T
iexport the probe pumping signal of each wafer respectively, the difference annular wafer in ring battle array ultrasonic phase array probe 8 is passed to by cable, annular wafer is produced in turn vibrate and send ultrasound wave, the ultrasound synthesis that finally each annular wafer sends is enter disc part of aero-engine 9 with the ultrasound wave of focusing effect;
2.4, the reception of ultrasound echo signal: the ultrasound wave with focusing effect enters disc part of aero-engine 9, reflection through defect or disc part of aero-engine 9 itself returns ring battle array ultrasonic phase array probe 8, annular wafer in ring battle array ultrasonic phase array probe 8 is vibrated, vibration is converted into electric signal by cable transmission to ultrasonic phase array defectoscope 5 by annular wafer, ultrasonic phase array defectoscope 5 receives the electric signal that each wafer returns, and according to delay time T
iall electric signal passed back are synthesized ultrasound echo signal ζ
1pass to computer for controlling 6;
2.5, the second depth of focus δ of ring battle array ultrasonic phase array probe 8 is determined
2, δ
2=20mm, then repeats step 2.2 ~ step 2.4, makes second depth of focus of focusing ultrasonic wave in disc part of aero-engine 9, obtain the ultrasound echo signal ζ under second depth of focus
2;
2.6, repeat step 2.5, until the recruitment of the depth of focus is less than 12mm, obtain 8 ultrasound echo signal ζ altogether
j, j=1,2 ..., 8 each ultrasound echo signals are corresponding with a depth of focus;
2.7, after changing the angle of turntable 2, obtain and record ultrasound echo signal: utilize turntable 2 to make the relative center of circle of disc part of aero-engine 9 along clockwise or rotate counterclockwise angle delta α, Δ α=0.1 °, repeat step 2.2 ~ step 2.6, turntable 2 obtains ultrasound echo signal, until have rotated a circle;
2.8, after changing the position of ring battle array ultrasonic phase array probe 8, obtain and record ultrasound echo signal: utilize three-dimensional moving device 4 control loop battle array ultrasonic phase array probe 8 along the diametric(al) displacement Δ x of disc part of aero-engine 9, Δ x=0.5mm, repeat step 2.2 ~ step 2.7, until ring battle array ultrasonic phase array probe 8 moves to inner port edge by the outer circular edge of disc part of aero-engine 9.
Embodiment 2, detects certain type aeromotor grade high-pressure turbine dish.
Turntable 2 in the water immersion ultrasonic phased-array device of aeromotor disk-like accessory of the present invention, three-dimensional moving device 4, ultrasonic phase array defectoscope 5, computer for controlling 6 and ring battle array ultrasonic phase array probe 8 is finished parts.The outside diameter of diskware is 620mm, and thickness is 126mm, and the step of detection is:
1, system connects: ring battle array ultrasonic phase array probe 8 and disc part of aero-engine 9 to be checked are immersed in flaw detection tank 1, connects the cable of turntable 2, switch board 3, three-dimensional moving device 4, ultrasonic phase array defectoscope 5, computer for controlling 6 and ring battle array ultrasonic phase array probe 8;
2, obtain and record ultrasound echo signal:
2.1, initial position is determined: the initial angle 0 ° determining current turntable 2, three-dimensional moving device 4 shift(ing) ring battle array ultrasonic phase array probe 8 is utilized to make its central axis be positioned at the outer circular edge of disc part of aero-engine 9, as the initial position of ring battle array ultrasonic phase array probe 8;
2.2, the time delay of ultrasonic signal emission and reception is determined:
Determine the first depth of focus δ of ring battle array ultrasonic phase array probe 8
1, δ
1=6mm, ultrasonic phase array defectoscope 5 is according to the first depth of focus δ
1determine the delay time T of ring battle array ultrasonic phase array probe 8 each wafers
i;
2.3, the transmitting of ultrasonic signal: ultrasonic phase array defectoscope 5 is according to delay time T
iexport the probe pumping signal of each wafer respectively, the difference annular wafer in ring battle array ultrasonic phase array probe 8 is passed to by cable, annular wafer is produced in turn vibrate and send ultrasound wave, the ultrasound synthesis that finally each annular wafer sends is enter disc part of aero-engine 9 with the ultrasound wave of focusing effect;
2.4, the reception of ultrasound echo signal: the ultrasound wave with focusing effect enters disc part of aero-engine 9, reflection through defect or disc part of aero-engine 9 itself returns ring battle array ultrasonic phase array probe 8, annular wafer in ring battle array ultrasonic phase array probe 8 is vibrated, vibration is converted into electric signal by cable transmission to ultrasonic phase array defectoscope 5 by annular wafer, ultrasonic phase array defectoscope 5 receives the electric signal that each wafer returns, and according to delay time T
iall electric signal passed back are synthesized ultrasound echo signal ζ
1pass to computer for controlling 6;
2.5, the second depth of focus δ of ring battle array ultrasonic phase array probe 8 is determined
2, δ
2=18mm, then repeats step 2.2 ~ step 2.4, makes second depth of focus of focusing ultrasonic wave in disc part of aero-engine 9, obtain the ultrasound echo signal ζ under second depth of focus
2;
2.6, repeat step 2.5, until the recruitment of the depth of focus is less than 12mm, obtain 11 ultrasound echo signal ζ altogether
j, j=1,2 ..., 10 each ultrasound echo signals are corresponding with a depth of focus;
2.7, after changing the angle of turntable 2, obtain and record ultrasound echo signal: utilize turntable 2 to make the relative center of circle of disc part of aero-engine 9 along clockwise or rotate counterclockwise angle delta α, Δ α=0.1 °, repeat step 2.2 ~ step 2.6, turntable 2 obtains ultrasound echo signal, until have rotated a circle; 2.8, after changing the position of ring battle array ultrasonic phase array probe 8, obtain and record ultrasound echo signal: utilize three-dimensional moving device 4 control loop battle array ultrasonic phase array probe 8 along the diametric(al) displacement Δ x of disc part of aero-engine 9, Δ x=0.3mm, repeat step 2.2 ~ step 2.7, until ring battle array ultrasonic phase array probe 8 moves to inner port edge by the outer circular edge of disc part of aero-engine 9.
Embodiment 3, detects seal pan before certain type aero-turbine.
Turntable 2 in the water immersion ultrasonic phased-array device of aeromotor disk-like accessory of the present invention, three-dimensional moving device 4, ultrasonic phase array defectoscope 5, computer for controlling 6 and ring battle array ultrasonic phase array probe 8 is finished parts.The outside diameter of diskware is 610mm, and thickness is 66mm, and the step of detection is:
1, system connects: ring battle array ultrasonic phase array probe 8 and disc part of aero-engine 9 to be checked are immersed in flaw detection tank 1, connects the cable of turntable 2, switch board 3, three-dimensional moving device 4, ultrasonic phase array defectoscope 5, computer for controlling 6 and ring battle array ultrasonic phase array probe 8;
2, obtain and record ultrasound echo signal:
2.1, initial position is determined: the initial angle 0 ° determining current turntable 2, three-dimensional moving device 4 shift(ing) ring battle array ultrasonic phase array probe 8 is utilized to make its central axis be positioned at the outer circular edge of disc part of aero-engine 9, as the initial position of ring battle array ultrasonic phase array probe 8;
2.2, the time delay of ultrasonic signal emission and reception is determined:
Determine the first depth of focus δ of ring battle array ultrasonic phase array probe 8
1, δ
1=6mm, ultrasonic phase array defectoscope 5 is according to the first depth of focus δ
1determine the delay time T of ring battle array ultrasonic phase array probe 8 each wafers
i;
2.3, the transmitting of ultrasonic signal: ultrasonic phase array defectoscope 5 is according to delay time T
iexport the probe pumping signal of each wafer respectively, the difference annular wafer in ring battle array ultrasonic phase array probe 8 is passed to by cable, annular wafer is produced in turn vibrate and send ultrasound wave, the ultrasound synthesis that finally each annular wafer sends is enter disc part of aero-engine 9 with the ultrasound wave of focusing effect;
2.4, the reception of ultrasound echo signal: the ultrasound wave with focusing effect enters disc part of aero-engine 9, reflection through defect or disc part of aero-engine 9 itself returns ring battle array ultrasonic phase array probe 8, annular wafer in ring battle array ultrasonic phase array probe 8 is vibrated, vibration is converted into electric signal by cable transmission to ultrasonic phase array defectoscope 5 by annular wafer, ultrasonic phase array defectoscope 5 receives the electric signal that each wafer returns, and according to delay time T
iall electric signal passed back are synthesized ultrasound echo signal ζ
1pass to computer for controlling 6;
2.5, the second depth of focus δ of ring battle array ultrasonic phase array probe 8 is determined
2, δ
2=18mm, then repeats step 2.2 ~ step 2.4, makes second depth of focus of focusing ultrasonic wave in disc part of aero-engine 9, obtain the ultrasound echo signal ζ under second depth of focus
2;
2.6, repeat step 2.5, until the recruitment of the depth of focus is less than 12mm, obtain 6 ultrasound echo signal ζ altogether
j, j=1,2 ..., 6 each ultrasound echo signals are corresponding with a depth of focus;
2.7, after changing the angle of turntable 2, obtain and record ultrasound echo signal: utilize turntable 2 to make the relative center of circle of disc part of aero-engine 9 along clockwise or rotate counterclockwise angle delta α, Δ α=0.1 °, repeat step 2.2 ~ step 2.6, turntable 2 obtains ultrasound echo signal, until have rotated a circle; 2.8, after changing the position of ring battle array ultrasonic phase array probe 8, obtain and record ultrasound echo signal: utilize three-dimensional moving device 4 control loop battle array ultrasonic phase array probe 8 along the diametric(al) displacement Δ x of disc part of aero-engine 9, Δ x=0.3mm, repeat step 2.2 ~ step 2.7, until ring battle array ultrasonic phase array probe 8 moves to inner port edge by the outer circular edge of disc part of aero-engine 9.
Claims (1)
1. the water immersion ultrasonic phased-array detection method of disc part of aero-engine, based on the water immersion ultrasonic phased-array pick-up unit of a disc part of aero-engine, this water immersion ultrasonic phased-array pick-up unit comprises flaw detection tank (1), turntable (2), switch board (3), three-dimensional moving device (4), reflectoscope, computer for controlling (6), probe gripper (7) and a ultrasonic probe, turntable (2) is positioned at below the water surface of flaw detection tank (1), three-dimensional moving device (4) is positioned at the outside of flaw detection tank (1), it is X-axis that first of three-dimensional moving device (4) moves horizontally axle, the upper end of probe gripper (7) is fixed on the mobile unit of X-axis, probe gripper (7) can move horizontally along X-axis, ultrasonic probe is arranged on the lower end of probe gripper (7), detected disc part of aero-engine (9) is fixed on the upper surface of turntable (2) worktable, the perpendicular displacement axes of three-dimensional moving device (4) is Z axis, X-axis is fixed on the mobile unit of Z axis, X-axis can along Z axis vertically movement, it is Y-axis that second of three-dimensional moving device (4) moves horizontally axle, the lower end of Z axis is fixed on the mobile unit of Y-axis, Z axis can move horizontally along Y-axis, X-axis is vertical with Y-axis, the control signal input end of three-dimensional moving device (4) is connected with the three-dimensional moving device control signal output terminal of switch board (3) by cable, the position signalling output terminal of three-dimensional moving device (4) is connected with the three-dimensional moving device position signalling input end of switch board (3) by cable, the control signal input end of turntable (2) is connected by the turning table control signal output part of cable with switch board (3), the position signalling output terminal of turntable (2) is connected by the revolving table position signal input part of cable with switch board (3), the bus interface of switch board (3) is connected by the bus interface of cable with computer for controlling (6), described reflectoscope is ultrasonic phase array defectoscope (5), described ultrasonic probe is ring battle array ultrasonic phase array probe (8), ultrasonic phase array defectoscope (5) ultrasound echo signal output terminal is connected by the ultrasound echo signal input end of cable with computer for controlling (6), the probe pumping signal input end of ring battle array ultrasonic phase array probe (8) is connected with the probe pumping signal output terminal of ultrasonic phase array defectoscope (5) by cable, the axes normal of ring battle array ultrasonic phase array probe (8) is in the upper surface of detected disc part of aero-engine (9), it is characterized in that, the step of detection is as follows:
1.1, system connects: ring battle array ultrasonic phase array probe (8) and disc part of aero-engine to be checked (9) are immersed in flaw detection tank (1), connects the cable of turntable (2), switch board (3), three-dimensional moving device (4), ultrasonic phase array defectoscope (5), computer for controlling (6) and ring battle array ultrasonic phase array probe (8);
1.2, obtain and record ultrasound echo signal:
1.2.1, initial position is determined: the initial angle α determining current turntable (2)
1three-dimensional moving device (4) shift(ing) ring battle array ultrasonic phase array probe (8) is utilized to make its central axis be positioned at the outer circular edge of disc part of aero-engine (9), as the initial position of ring battle array ultrasonic phase array probe (8);
1.2.2 the time delay of ultrasonic signal emission and reception, is determined:
Determine the first depth of focus δ of ring battle array ultrasonic phase array probe (8)
1, δ
1=6mm ~ 12mm, ultrasonic phase array defectoscope (5) is according to the first depth of focus δ
1determine the delay time T of ring battle array ultrasonic phase array probe (8) each wafer
i, i is the sequence number of the upper wafer of ring battle array ultrasonic phase array probe (8), i=1,2 ..., n; Delay time T
ibeing the time delay of ultrasonic signal emission, is again the time delay that ultrasonic signal receives;
1.2.3, the transmitting of ultrasonic signal: ultrasonic phase array defectoscope (5) is according to delay time T
iexport the probe pumping signal of each wafer respectively, the difference annular wafer in ring battle array ultrasonic phase array probe (8) is passed to by cable, annular wafer is produced in turn vibrate and send ultrasound wave, the ultrasound synthesis that finally each annular wafer sends is enter disc part of aero-engine (9) with the ultrasound wave of focusing effect;
1.2.4, the reception of ultrasound echo signal: the ultrasound wave with focusing effect enters disc part of aero-engine (9), reflection through defect or disc part of aero-engine (9) itself returns ring battle array ultrasonic phase array probe (8), the annular wafer that ring battle array ultrasonic phase array is popped one's head in (8) vibrates, vibration is converted into electric signal by cable transmission to ultrasonic phase array defectoscope (5) by annular wafer, ultrasonic phase array defectoscope (5) receives the electric signal that each wafer returns, and according to the delay time T that ultrasonic signal receives
iall electric signal passed back are synthesized ultrasound echo signal ζ
1pass to computer for controlling (6);
1.2.5 the second depth of focus δ of ring battle array ultrasonic phase array probe (8), is determined
2, δ
2=δ
1+ 12mm, then repeats step 1.2.2 ~ step 1.2.4, makes second depth of focus of focusing ultrasonic wave in disc part of aero-engine (9), obtain the ultrasound echo signal ζ under second depth of focus
2;
1.2.6, repeat step 1.2.5, repeat to make the depth of focus increase progressively 12mm at every turn, until the recruitment of the depth of focus is less than 12mm, obtain m ultrasound echo signal ζ altogether
j, j=1,2 ..., m, each ultrasound echo signal is corresponding with a depth of focus;
1.2.7 after, changing the angle of turntable (2), obtain and record ultrasound echo signal: utilize turntable (2) to make the relative center of circle of disc part of aero-engine (9) along clockwise or rotate counterclockwise angle delta α, Δ α=0.1 ° ~ 1 °, repeat step 1.2.2 ~ step 1.2.6, turntable (2) obtains ultrasound echo signal, until have rotated a circle;
1.2.8 after, changing the position of ring battle array ultrasonic phase array probe (8), obtain and record ultrasound echo signal: utilize three-dimensional moving device (4) control loop battle array ultrasonic phase array probe (8) along diametric(al) displacement Δ x of disc part of aero-engine (9), Δ x=0.1mm ~ 1mm, repeat step 1.2.2 ~ step 1.2.7, until ring battle array ultrasonic phase array probe (8) moves to inner port edge by the outer circular edge of disc part of aero-engine (9).
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