CN104914171A - Detecting method of far-field near-bottom-surface blind areas of ultrasonic wave normal probes and workpiece processing method for overcoming near-bottom-surface defect of workpiece - Google Patents
Detecting method of far-field near-bottom-surface blind areas of ultrasonic wave normal probes and workpiece processing method for overcoming near-bottom-surface defect of workpiece Download PDFInfo
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Abstract
The invention discloses a detecting method of far-field near-bottom-surface blind areas of ultrasonic wave normal probes and a workpiece processing method for overcoming the near-bottom-surface defect of a workpiece. The detecting method comprises the following steps: preparing a test block, namely, manufacturing the detecting test block with the designated specification according to the testing need; and testing a blind area, namely, applying an appropriate coupling agent between an ultrasonic wave normal probe and the detected test block, putting the ultrasonic wave normal probe on the upper surface of the detected test block, moving the ultrasonic wave normal probe to sequentially detect flat bottom cylindrical holes with different depths, and judging whether the flat bottom cylindrical holes with different depths are the far-field blind area of the ultrasonic wave normal probe according to oscillograms. The detecting method is simple to operate, is accurate in result, can be used for accurately testing the far-field blind areas of various ultrasonic wave normal probes by reasonably manufacturing detected test blocks, is wide in applicability, fills up the blank of a detection technique of the far-field blind areas of normal probes, and can provide accurate data about design processing allowance for product designers via the measurement of the far-field blind areas so as to guarantee the product processing quality and save the processing cost.
Description
Technical field
The present invention relates to a kind of detection method and Work piece processing method, the detection method of blind area, nearly bottom surface, especially a kind of straight beam method head far field and overcome the Work piece processing method of workpiece nearly bottom surface defect.
Background technology
Ultrasonic Detection is the one of Non-Destructive Testing conventional method, straight beam method head is the probe that in Ultrasonic Detection, usable range is the widest, be widely used in the detection of the parts such as field foundry goods, forging, weldment such as oil, metallurgy, military project, railway, Aeronautics and Astronautics, special inspection, bridge, boats and ships, building, for guarantee part Product quality and safety, there is vital role.
As everyone knows; when using ultrasonic normal probe far field to detect; often can run into a kind of situation; and this situation is ignored by vast nondestructive testing personnel; even few people recognize; that be exactly nearly bottom surface defect reflection echo with the resolution problems between the bottom reflection echo of workpiece own, namely straight beam method head detects the blind zone problem of far field defect near the ground.
Because usual workpiece bottom reflection echo energy is high; reflection is strong; when in the certain limit of workpiece nearly bottom surface during existing defects; defect reflection echo within the scope of this is near the bottom reflection echo of workpiece own; two echoes are in time reaching certain distance, and testing staff just cannot tell flaw echo from ultrasound measuring instrument oscillograph, and at this moment operating personnel can think to only have bottom reflection echo usually; and there is no flaw echo, cause defect undetected.Particularly when thickness of workpiece scope is large, because ultrasound measuring instrument oscillograph base line indication range is certain, thickness is larger, and the quantity of information of display is larger, and blind area is larger, causes potential safety hazard to the use of product.After some workpiece ultrasound examinations, need be processed as finished product further toward contact, the situation that after also often there is processing, defect is appeared, causes the waste of processing cost.Therefore, solve the test problem of straight beam method head far field detection blind area near the ground, for prevent defects in ultrasonic testing undetected, reduce costs, provide accurate data significant for the design of product design personnel process redundancy.
But, also do not find that test block and method are detected in the blind area, nearly bottom surface, straight beam method head far field of announcing at present, the domestic standard for the performance test of straight beam method head mainly contains national standard and industry standard at present, and the performance index for straight beam method head mainly contain surplus sensitivity, echo frequency, echo length, vertical linearity, horizontal linearity, beam width, acoustic beam skew, resolving power and blind area, near field etc.Existing method can only detect blind area, normal probe near field, blind area, near field is because straight beam method head initial pulse accounts for wide, cause the defect reflection echo within the scope of distance detection faces one segment distance overlapping with initial pulse and cannot differentiate and cause, the method for detection blind area, near field is not suitable for the detection of blind area, nearly bottom surface, far field.
Summary of the invention
Object of the present invention is exactly to solve the above-mentioned problems in the prior art, provides a kind of utilization to specify detection test block carry out the method for blind area, nearly bottom surface, straight beam method head far field detection and utilize said method to overcome the Work piece processing method of workpiece nearly bottom surface defect.
Object of the present invention is achieved through the following technical solutions:
A detection method for blind area, nearly bottom surface, straight beam method head far field, is characterized in that: comprise the steps:
S1, test block preparation process: according to test needs, make the detection test block of specifying specification;
S2, blind area testing procedure: straight beam method head is placed in and detects on test block upper surface, and couplant is applied between described straight beam method head and detection test block; Mobile described straight beam method head detects the flat cylindrical hole of different depth successively, and the echo amplitude of flat cylindrical hole is adjusted to instrument oscillography shields full-scale specified altitude assignment; Judge that according to oscillogram whether the degree of depth corresponding to flat cylindrical hole of different depth is the blind area, far field of straight beam method head.
Preferably, the detection method of described blind area, nearly bottom surface, straight beam method head far field, wherein: at S1, in test block preparation process, the detection test block of described appointment specification comprises rectangular parallelepiped body, and on described body, gap offers the flat cylindrical hole of a specified quantity specified size, and described flat cylindrical hole lower ending opening is positioned at the bottom surface of described body, and the bottom surface of described flat cylindrical hole is the disk being parallel to body bottom surface, the central axis of described disk is in the bottom surface of body.
Preferably, the detection method of described blind area, nearly bottom surface, straight beam method head far field, wherein: the length of described rectangular parallelepiped body is 150-300mm, and width is 40-50mm, is highly 100-200mm.
Preferably, the detection method of described blind area, nearly bottom surface, straight beam method head far field, wherein: the specified quantity of described flat cylindrical hole is 3-7, the specified size of described flat cylindrical hole comprises diameter (Ф) and the degree of depth, wherein the diameter (Ф) of each described flat cylindrical hole is 1-3mm, and the degree of depth of described flat cylindrical hole is according to designated ratio increasing or decreasing.
Preferably, the detection method of described blind area, nearly bottom surface, straight beam method head far field, wherein: the specified quantity of described flat cylindrical hole is 4, the diameter (Ф) of each described flat cylindrical hole is 2mm, and the degree of depth of described flat cylindrical hole is followed successively by 1mm, 2mm, 3mm, 4mm.
Preferably, the detection method of described blind area, nearly bottom surface, straight beam method head far field, wherein: at described S2, in the testing procedure of blind area, described couplant is machine oil.
Preferably, the detection method of described blind area, nearly bottom surface, straight beam method head far field, wherein: at described S2, in the testing procedure of blind area, is adjusted to instrument oscillography screen full-scale 50% ~ 90% by the echo amplitude of described flat cylindrical hole.
Preferably, the detection method of described blind area, nearly bottom surface, straight beam method head far field, wherein: described S2, blind area testing procedure comprises:
S21, level range finding demarcating steps: be placed in by straight beam method head and detect the intact position of test block, carries out level range finding and demarcates, and show that oscillogram in zero defect situation is as reference;
S22, artificial defect testing procedure: mobile straight beam method head, measure the flat cylindrical hole of different depth one by one, observe each flat cylindrical hole reflection echo measured and the waveform situation detected between test block bottom reflection echo, and by the oscillogram of gained and S21, the oscillogram obtained in level range finding demarcating steps contrasts;
S23, blind area determining step: when being the designated value of instrument oscillograph scale all over the screen along the trough crossing with the forward position of bottom reflection echo after the reflection echo drawing flat cylindrical hole, then assert that the degree of depth of described flat cylindrical hole is the blind area, far field of described straight beam method head.
Preferably, the detection method of described blind area, nearly bottom surface, straight beam method head far field, wherein: at described S22, in artificial defect testing procedure, the order of successively decreasing according to the flat cylindrical hole degree of depth during test is carried out.
Preferably, the detection method of described blind area, nearly bottom surface, straight beam method head far field, wherein: at described S23, in the determining step of blind area, when shielding full-scale 10% along the trough crossing with the forward position of bottom reflection echo lower than instrument oscillography after the echo recording flat cylindrical hole, then the degree of depth of this flat cylindrical hole is the blind area, far field of this straight beam method head.
Overcome a Work piece processing method for workpiece nearly bottom surface defect, comprise the following steps:
S11, process redundancy reserves step: the blind area, far field obtaining straight beam method head according to the detection method test of the arbitrary described blind area, nearly bottom surface, straight beam method head far field of claim 1-10, and reserves the process redundancy being greater than blind area, the described far field degree of depth in workpiece upper end;
S12, bottom cutting step: after work pieces process is shaping, cuts part identical with blind area, the described far field degree of depth bottom workpiece, then the part of workpiece top process redundancy residual altitude is cut, and obtains final finished.
The advantage of technical solution of the present invention is mainly reflected in:
This method is simple to operate, and result is accurate, by rationally making detection test block, can test out the blind area, far field of various straight beam method head accurately, and applicability is wide, solves the problem of blind area, normal probe far field detection technique disappearance; And data accurately can be provided for product design personnel design process redundancy by the measurement of blind area, far field, avoiding problems because blind area, straight beam method head far field causes nearly bottom surface defect to detect, occur that defect such as to be appeared at the situation being processed as further in Finished product processThe, cause the low situation of even scrapping of product quality, ensure product processing quality, save processing cost.
By reserved process redundancy is set to the degree of depth being greater than blind area, described far field, the defect in blind area, far field can not only be avoided, further, arranging under rational condition, effectively can avoid the defect of blind area, straight beam method head near field, improve the quality of final finished further.
Accompanying drawing explanation
Fig. 1 detects test block schematic diagram in embodiment;
Fig. 2 is the schematic diagram of method of testing in embodiment;
The oscillogram of level range finding corresponding to demarcating steps in Fig. 3 embodiment;
Fig. 4 tests oscillogram corresponding to the flat cylindrical hole of 4mm in embodiment;
Fig. 5 tests oscillogram corresponding to the flat cylindrical hole of 3mm in embodiment;
Fig. 6 tests oscillogram corresponding to the flat cylindrical hole of 3mm in embodiment.
Embodiment
Object of the present invention, advantage and disadvantage, by for illustration and explanation for the non-limitative illustration passing through preferred embodiment below.These embodiments are only the prominent examples of application technical solution of the present invention, allly take equivalent replacement or equivalent transformation and the technical scheme that formed, all drop within the scope of protection of present invention.
The detection method of the blind area, nearly bottom surface, a kind of straight beam method head far field that the present invention discloses, comprises the steps:
S1, test block preparation process: according to test needs, make the detection test block of specifying specification; Concrete, as shown in Figure 1, the detection test block of described appointment specification comprises rectangular parallelepiped body 1, long described side's body body 1 has front 11, upper surface 12, left side 13, right side 14, bottom surface 15 and the back side 16, and above-mentioned each face is plane, the length of described rectangular parallelepiped body 1 can detect needs according to reality and arrange, preferably, the length of described rectangular parallelepiped body 1 is 150-300mm, width is 40-60mm, be highly 100-200mm, in the present embodiment, be specifically chosen as length 200mm, width 50mm, height 107mm.
On the bottom surface 15 of described body 1, gap offers the flat cylindrical hole 2 of 4 specified size, described flat cylindrical hole lower ending opening is positioned at the bottom surface of described body 1, and the bottom surface of described flat cylindrical hole 2 is the disk being parallel to body 1 bottom surface, the central axis of described disk is in the bottom surface of body 1; Although the quantity of the flat-bottom hole of cylinder described in this example is 4, also can requires to adjust according to actual accuracy of detection, be preferably at least 3, more preferably 3-7; And the gap between described flat cylindrical hole 2 can equidistantly be arranged, also can arrange by Unequal distance, meet the length being no more than described body 1.
The size [diameter (Ф) and the degree of depth] of described flat cylindrical hole 2 can be any value meeting actual defects size and detect test block size, and preferred diameter (Ф) is 1-3mm, more preferably 2mm in the present embodiment; The degree of depth of described flat cylindrical hole increases progressively according to designated ratio; Described ratio can require to arrange with accuracy of detection, is preferably 0.5-1.5mm, is preferably 1mm in the present embodiment; The depth capacity of described flat cylindrical hole 2 also can be arranged according to practical experience, is preferably 1-10mm, and be preferably 4mm in the present embodiment, therefore described in the present embodiment, the degree of depth of flat cylindrical hole 2 is followed successively by 1mm, 2mm, 3mm, 4mm from small to large.
S2, blind area testing procedure: as shown in Figure 2, straight beam method head is placed in and detects on test block upper surface, and suitable couplant is applied to keep stable acoustic coupling between described straight beam method head and detection test block, described couplant can be known various couplants, as machine oil, transformer oil, railway grease, glycerine, water glass (sodium silicate Na2SiO3) or industrial glue, chemical paste, in the present embodiment, be preferably machine oil.Mobile described straight beam method head detects the flat cylindrical hole of different depth successively, and is adjusted to by the echo amplitude of flat cylindrical hole and is greater than instrument oscillography screen full-scale 50%, is preferably 50%-90%; Judge that whether the degree of depth of the flat cylindrical hole of correspondence is the blind area, far field of straight beam method head again according to the oscillogram that records at every turn, concrete, it comprises the following steps:
S21, level range finding demarcating steps: be placed in by straight beam method head and detect the intact position of test block, carries out level range finding and demarcates, and as shown in Figure 3, show that oscillogram in zero defect situation is as reference; Now, whole oscillogram display only has beginning ripple and bottom surface ripple (detecting test block bottom reflection echo).
S22, artificial defect testing procedure: mobile straight beam method head, measure the flat cylindrical hole of different depth one by one, observe each flat cylindrical hole reflection echo measured and the waveform situation detected between test block bottom reflection echo, and by the oscillogram of gained and S21, the oscillogram obtained in level range finding demarcating steps contrasts.
S23, blind area determining step: when being the designated value of instrument oscillograph scale all over the screen along the trough crossing with the forward position of bottom reflection echo after the reflection echo drawing flat cylindrical hole, then assert that whether the degree of depth of described flat cylindrical hole is the blind area, far field of described straight beam method head.Concrete, when shielding full-scale 10% along the trough crossing with the forward position of bottom reflection echo lower than instrument oscillography after the echo judging flat cylindrical hole, then the degree of depth of this flat cylindrical hole is the blind area, far field of this straight beam method head.
When testing, because the order of successively decreasing according to flat cylindrical hole 2 degree of depth is carried out, therefore in the present embodiment, first MTD is the flat cylindrical hole 24 of 4mm, record result as shown in Figure 4, by comparing can find out with the level oscillogram that demarcating steps obtains of finding range, not only demonstrating the beginning in described oscillogram involves bottom surface ripple (detect test block bottom reflection echo), now because defect exists, flaw echo partly overlapping with bottom surface ripple is also show in oscillogram, defect can effectively be identified, namely when this degree of depth, straight beam method head still can detect this defect, it not blind area, far field.
Then MTD is the flat cylindrical hole 23 of 3mm, record result as shown in Figure 5, by comparing can find out with the level oscillogram that demarcating steps obtains of finding range, not only demonstrating the beginning in described oscillogram involves bottom surface ripple, now because defect exists, flaw echo partly overlapping with bottom surface ripple is also show in oscillogram, just compared to the oscillogram that the flat cylindrical hole of test 4mm obtains, the area that now flaw echo is overlapping with bottom surface ripple significantly increases, the flaw echo area that can identify is less, but still can identify flaw echo by naked eyes, namely when this degree of depth, straight beam method head still can detect this defect, it not blind area, far field.
Further, MTD is the flat cylindrical hole 22 of 2mm, record result as shown in Figure 6, now, by comparing can find out with the level oscillogram that demarcating steps obtains of finding range, this test and level calibration result of finding range is close, also only demonstrating the beginning in described oscillogram involves bottom surface ripple, although now there is the defect of 2mm, but because defect and bottom surface are apart from too near, flaw echo is overlapping with bottom surface ripple, and covered completely by bottom surface ripple, now from oscillogram, flaw echo cannot be identified by naked eyes, namely when this degree of depth and the following degree of depth, even if existing defects, straight beam method head also None-identified goes out, now 2mm is the blind area, far field of described straight beam method head.
As can be seen from said process, in the present embodiment, under thickness of workpiece is 107mm situation, for the flat cylindrical hole of Ф 2 of distance bottom surface different distance, when its degree of depth is 2mm, its reflection wave and workpiece bottom echo area cannot separate by ultrasound measuring instrument.Therefore, under these conditions, the defect for all Ф of being less than or equal to 2 within the scope of distance bottom surface 2mm all cannot be found by Ultrasonic Detection, and namely this distance 2mm can be used as blind area near the ground distance.Therefore, now namely no longer need to carry out the test that the degree of depth is the flat cylindrical hole 21 of 1mm.
On the other hand, because workpiece nearly bottom surface defect exists, and owing to there is blind area, far field, straight beam method head cannot detect that these defects are to overcome, also just cause in workpieces in subsequent process, defect can affect the problem of end product quality, therefore in order to solve the problem, present invention further proposes a kind of detection method of blind area, nearly bottom surface, above-mentioned straight beam method head far field that utilizes to overcome the Work piece processing method of workpiece nearly bottom surface defect, to ensure the quality of final products, it comprises the following steps:
S11, process redundancy reserves step: the blind area, far field obtaining straight beam method head according to the detection method test of described blind area, nearly bottom surface, straight beam method head far field, and the process redundancy being greater than blind area, the described far field degree of depth is reserved in the upper end of described workpiece, the degree of depth that why process redundancy is set to be greater than blind area, described far field herein considers the existence of blind area, straight beam method head near field, namely due to the existence of blind area, near field, go out for the defect in ultrasonic probe surface of contact certain limit also None-identified, if existing defects also will certainly affect product quality in blind area, near field, recording blind area, far field in the present embodiment is 2mm, and now, the process redundancy that can reserve is greater than blind area, described far field, namely 2mm is greater than, more preferably be more than or equal to blind area, described far field and blind area, near field sum, if blind area, near field is 1mm, then process redundancy can be 3mm or larger.
S12, cutting step: after work pieces process is shaping, cuts part identical with blind area, the described far field degree of depth bottom workpiece, then is cut in described workpiece top and the remaining part of process redundancy (process redundancy-blind area, far field), namely obtains final finished.Under the condition that reserved process redundancy is suitable, the size of process redundancy remainder equal the size of blind area, described near field.
Now, although existing defects still cannot be differentiated within the scope of the distance 2mm of blind area, even if now existing defects in blind area, far field, under guarantee workpiece upper end does not have defective condition, after part identical with far field gap height bottom workpiece is cut, workpiece final finished not existing defects can be guaranteed, meet testing requirement, ensure the quality of final finished.
The present invention still has numerous embodiments, all employing equivalents or equivalent transformation and all technical schemes formed, and all drops within protection scope of the present invention.
Claims (11)
1. a detection method for blind area, nearly bottom surface, straight beam method head far field, is characterized in that: comprise the steps:
S1, test block preparation process: according to test needs, make the detection test block of specifying specification;
S2, blind area testing procedure: straight beam method head is placed in and detects in test block upper surface (12), and apply to specify couplant between described straight beam method head and detection test block; Mobile described straight beam method head detects the flat cylindrical hole (2) of different depth successively, and the echo amplitude of flat cylindrical hole (2) is adjusted to instrument oscillography shields full-scale specified altitude assignment, judge that according to oscillogram whether the degree of depth corresponding to flat cylindrical hole (2) of different depth is the blind area, far field of straight beam method head.
2. the detection method of blind area, nearly bottom surface, straight beam method head far field according to claim 1, it is characterized in that: at S1, in test block preparation process, the detection test block of described appointment specification comprises rectangular parallelepiped body (1), the upper gap of described body (1) offers the flat cylindrical hole (2) of a specified quantity specified size, described flat cylindrical hole lower ending opening is positioned at the bottom surface (15) of described body, and the bottom surface of described flat cylindrical hole (2) is for being parallel to the disk of described body bottom surface (15), the central axis of described disk is in the bottom surface (15) of described body.
3. the detection method of blind area, nearly bottom surface, straight beam method head far field according to claim 2, is characterized in that: the length of described rectangular parallelepiped body (1) is 150-300mm, and width is 40-50mm, is highly 100-200mm.
4. the detection method of blind area, nearly bottom surface, straight beam method head far field according to claim 3, it is characterized in that: the specified quantity of described flat cylindrical hole (2) is 3-7, the specified size of described flat cylindrical hole (2) comprises diameter (Ф) and the degree of depth, wherein the diameter (Ф) of each described flat cylindrical hole (2) is 1-3mm, and the degree of depth of described flat cylindrical hole (2) is according to designated ratio increasing or decreasing.
5. the detection method of blind area, nearly bottom surface, straight beam method head far field according to claim 4, it is characterized in that: the specified quantity of described flat cylindrical hole (2) is 4, the diameter (Ф) of each described flat cylindrical hole (2) is 2mm, and the degree of depth of described flat cylindrical hole (2) is followed successively by 1mm, 2mm, 3mm, 4mm.
6. the detection method of blind area, nearly bottom surface, straight beam method head far field according to claim 1, is characterized in that: at described S2, and in the testing procedure of blind area, described couplant is machine oil.
7. the detection method of blind area, nearly bottom surface, straight beam method head far field according to claim 1, is characterized in that: at described S2, in the testing procedure of blind area, the echo amplitude of described flat cylindrical hole (2) is adjusted to instrument oscillography screen full-scale 50% ~ 90%.
8. the detection method of blind area, nearly bottom surface, straight beam method head far field according to claim 1, it is characterized in that: described S2, blind area testing procedure comprises:
S21, level range finding demarcating steps: be placed in by straight beam method head and detect the intact position of test block, carries out level range finding and demarcates, and show that oscillogram in zero defect situation is as reference;
S22, artificial defect testing procedure: mobile straight beam method head, measure the flat cylindrical hole (2) of different depth one by one, the reflection echo observing each flat cylindrical hole (2) measured and the waveform situation detected between test block bottom reflection echo, and by the oscillogram of gained and S21, the oscillogram obtained in level range finding demarcating steps contrasts;
S23, blind area determining step: when being the designated value of instrument oscillograph scale all over the screen along the trough crossing with the forward position of bottom reflection echo after the reflection echo drawing flat cylindrical hole (2), then assert that the degree of depth of described flat cylindrical hole (2) is the blind area, far field of described straight beam method head.
9. the detection method of blind area, nearly bottom surface, straight beam method head far field according to claim 8, is characterized in that: at described S22, and in artificial defect testing procedure, the order of successively decreasing according to flat cylindrical hole (2) degree of depth during test is carried out.
10. the detection method of blind area, nearly bottom surface, straight beam method head far field according to claim 8, it is characterized in that: at described S23, in the determining step of blind area, when shielding full-scale 10% along the trough crossing with the forward position of bottom reflection echo lower than instrument oscillography after the echo recording flat cylindrical hole (2), then the degree of depth of this flat cylindrical hole (2) is the blind area, far field of this straight beam method head.
11. 1 kinds of Work piece processing methods overcoming workpiece nearly bottom surface defect, is characterized in that: comprise the following steps:
S11, process redundancy reserves step: the blind area, far field obtaining straight beam method head according to the detection method test of the arbitrary described blind area, nearly bottom surface, straight beam method head far field of claim 1-10, and reserves the process redundancy being greater than blind area, the described far field degree of depth in workpiece upper end;
S12, cutting step: after work pieces process is shaping, cuts part identical with blind area, the described far field degree of depth bottom workpiece, then the part of workpiece top process redundancy residual altitude is cut, and obtains final finished.
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| CN105423965A (en) * | 2015-11-16 | 2016-03-23 | 南车戚墅堰机车车辆工艺研究所有限公司 | Locomotive vehicle axle crack depth measuring method |
| CN105784847A (en) * | 2016-04-07 | 2016-07-20 | 中车戚墅堰机车车辆工艺研究所有限公司 | Workpiece manufacturing method for eliminating defects of side wall blind zone of cylindrical workpiece |
| CN109541035A (en) * | 2018-12-19 | 2019-03-29 | 中钢集团邢台机械轧辊有限公司 | A kind of discriminating method of iron and steel casting and steel forging |
| CN113740429A (en) * | 2021-09-03 | 2021-12-03 | 中国航发沈阳黎明航空发动机有限责任公司 | Method for measuring ultrasonic flaw detection blind area at step of disc forging |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105423965A (en) * | 2015-11-16 | 2016-03-23 | 南车戚墅堰机车车辆工艺研究所有限公司 | Locomotive vehicle axle crack depth measuring method |
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| CN105784847B (en) * | 2016-04-07 | 2018-12-04 | 中车戚墅堰机车车辆工艺研究所有限公司 | A kind of workpiece manufacturing method for eliminating cylindrical work side wall blind area defect |
| CN109541035A (en) * | 2018-12-19 | 2019-03-29 | 中钢集团邢台机械轧辊有限公司 | A kind of discriminating method of iron and steel casting and steel forging |
| CN113740429A (en) * | 2021-09-03 | 2021-12-03 | 中国航发沈阳黎明航空发动机有限责任公司 | Method for measuring ultrasonic flaw detection blind area at step of disc forging |
| CN113740429B (en) * | 2021-09-03 | 2024-02-02 | 中国航发沈阳黎明航空发动机有限责任公司 | Method for measuring ultrasonic flaw detection blind area at step of disc forging |
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