CN102841139A - Method for detecting plunger spring surface defects by use of ultrasonic waves - Google Patents
Method for detecting plunger spring surface defects by use of ultrasonic waves Download PDFInfo
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- CN102841139A CN102841139A CN2012102173650A CN201210217365A CN102841139A CN 102841139 A CN102841139 A CN 102841139A CN 2012102173650 A CN2012102173650 A CN 2012102173650A CN 201210217365 A CN201210217365 A CN 201210217365A CN 102841139 A CN102841139 A CN 102841139A
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- plunger spring
- surface defects
- crest height
- spring surface
- spring
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention discloses a method for detecting plunger spring surface defects by use of ultrasonic waves, belonging to a non-destructive detection method. The invention aims to provide a non-destructive detection method capable of accurately and quickly discovering spring surface defects. The method comprises the following steps of: scanning two end surfaces of a plunger spring by use of a probe of an ultrasonic detector respectively; comparing the crest height average of the twice-reflected waves with the standard crest height, wherein if the crest height average is greater than or equal to the standard crest height, the plunger spring has surface defects; and determining the defect position according to the horizontal distance between the twice-reflected waves on a display. The method disclosed by the invention solves the problem that a common non-destructive inspection method can not detect pit defects on the spring surface, has the advantages of high efficiency, low labor intensity and the like, is simple and convenient to operate and is accurate and reliable, thereby being a method for detecting spring surface defects.
Description
Technical field
The present invention relates to a kind of method of detection of mechanical component, relate in particular to a kind of method of utilizing the ultrasonic listening surface defects of mechanical parts.
Background technology:Plunger spring is a strength member of engine plunger type fuel pump, will bear the thousands of inferior high load capacity compressions of per minute in the work.Because high frequency alternating shear stress and distorting stress that spring steel wire bore mainly concentrate on the surface, so the plunger spring surface is concentrated and cause fatigue break if exist shallow and wide hole spot defect then to form stress easily.At present, adopt magnetic powder inspection or permeation flaw detection to be difficult to find the shallow and wide hole spot defect of this type, can only utilize magnifier to detect judgement through the mode of range estimation; Not only efficient is low, labour intensity is big, but also has defectives such as poor reliability, easy omission.
Summary of the invention:In order to overcome the defective that exists in the prior art, the present invention aims to provide a kind of method of ultrasound examination plunger spring surface imperfection, utilizes this method can find to be present in the shallow hole class defective on plunger spring surface accurately, fast.
To achieve these goals; Technical scheme of the present invention is that the probe with ultrasonic wave detector carries out scanning to the both ends of the surface of plunger spring respectively; The crest height mean value and the standard wave peak heights of twice reflection wave are compared, if said crest height mean value >=said standard wave peak heights shows that then there is defective in the plunger spring surface; Confirm defective locations according to the horizontal range of twice reflection wave on display then.
Compare with prior art, the present invention is owing to adopted technique scheme, and the compressional wave that utilizing pops one's head in sends is in the both ends of the surface generation waveform transformation of spring; The ultrasonic surface wave that produces is propagated along the spring surface and when running into hole point type defective, the part ultrasound wave can be reflected and received by probe, thereby on display, reflects; Crest height and horizontal ordinate according to reflection wave can accurately be judged defect size and existing position.The invention solves common nondestructive means can not detection springs surface imperfection point the problem of type defective, have simple to operation, efficient is high, labour intensity is little, wait advantage accurately and reliably.Production practices prove that hundreds thousand of plunger springs that utilize the inventive method to detect are generation and because of a surface imperfection point type defective phenomenons such as fracture take place in test run and use.
Embodiment:Below with external diameter be 11 ㎜, steel wire diameter be 1.4 ㎜, number of total coils be 23 the circle plunger spring be that concrete embodiment is described further the present invention, concrete steps are following:
1) using Rockwell hardometer to extrude a degree of depth at 1/2nd places of plunger spring number of total coils is that 0.034 ± 0.003 ㎜, diameter are the shallow hole of 0.24 ± 0.02 ㎜, gets the standard specimen spring;
2) selecting incident angle for use is that 62 °, wafer are that 4 * 7 ㎜, frequency are 5MH
ZThe ultrasonic listening instrument probe respectively the both ends of the surface of above-mentioned standard specimen spring are carried out scanning;
3) horizontal range (being horizontal ordinate) of adjustment reflection wave makes reflection configuration be positioned at the centre position of display; Adjust the gain of ultrasonic wave detector then, confirm sensitivity, make that big reflection at peak narrow down to 40% with that little reflection at peak;
4) calculate the crest height mean value of twice reflection wave, promptly get the standard wave peak heights;
5) respectively the both ends of the surface of the plunger spring (workpiece) of above-mentioned specification are carried out scanning with above-mentioned ultrasonic wave detector probe, and calculate the crest height mean value of twice reflection wave; This crest height mean value and said standard wave peak heights are compared, if said crest height mean value >=standard wave peak heights shows that then there is defective in the plunger spring surface, otherwise then decidable is qualified;
6) can confirm defective locations according to the horizontal range of twice reflection wave on display.
In the above-described embodiments, selecting incident angle for use is that 62 °, wafer are that 4 * 7 ㎜, frequency are 5MH
ZThe ultrasonic listening instrument probe can reach best sensitivity and make up with signal to noise ratio (S/N ratio).Spring for other specification then should be according to test to recently selecting suitable probe.The size of shallow hole should be confirmed according to the tired minimal surface flaw size that fracture takes place of workpiece (plunger spring) internal cause between unit on the standard specimen spring.
Claims (1)
1. the method for a ultrasound examination plunger spring surface imperfection; It is characterized in that: the probe with ultrasonic wave detector carries out scanning to the both ends of the surface of plunger spring respectively; The crest height mean value and the standard wave peak heights of twice reflection wave are compared, if said crest height mean value >=said standard wave peak heights shows that then there is defective in the plunger spring surface; Confirm defective locations according to the horizontal range of twice reflection wave on display then.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102173650A CN102841139A (en) | 2012-06-28 | 2012-06-28 | Method for detecting plunger spring surface defects by use of ultrasonic waves |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102173650A CN102841139A (en) | 2012-06-28 | 2012-06-28 | Method for detecting plunger spring surface defects by use of ultrasonic waves |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102841139A true CN102841139A (en) | 2012-12-26 |
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| CN2012102173650A Pending CN102841139A (en) | 2012-06-28 | 2012-06-28 | Method for detecting plunger spring surface defects by use of ultrasonic waves |
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| CN (1) | CN102841139A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104483383A (en) * | 2014-12-05 | 2015-04-01 | 长春航空液压控制有限公司 | Ultrasonic detection method of plunger spring |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5469743A (en) * | 1993-06-24 | 1995-11-28 | Zorn; Roger H. | Dynamic surface wave roll inspection device |
| US6105431A (en) * | 1995-05-18 | 2000-08-22 | Aea Technology Plc | Ultrasonic inspection |
| CN101149358A (en) * | 2007-11-05 | 2008-03-26 | 钢铁研究总院 | Train wheel surface automatic electromagnetic supersonic detection device and method |
-
2012
- 2012-06-28 CN CN2012102173650A patent/CN102841139A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5469743A (en) * | 1993-06-24 | 1995-11-28 | Zorn; Roger H. | Dynamic surface wave roll inspection device |
| US6105431A (en) * | 1995-05-18 | 2000-08-22 | Aea Technology Plc | Ultrasonic inspection |
| CN101149358A (en) * | 2007-11-05 | 2008-03-26 | 钢铁研究总院 | Train wheel surface automatic electromagnetic supersonic detection device and method |
Non-Patent Citations (2)
| Title |
|---|
| 陈明德 等: "超声瑞利表面波检查弹簧缺陷", 《工程与饰演》 * |
| 陶文浩: "重要弹簧材料缺陷及其超声波探伤检查", 《汽车科技》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104483383A (en) * | 2014-12-05 | 2015-04-01 | 长春航空液压控制有限公司 | Ultrasonic detection method of plunger spring |
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Application publication date: 20121226 |