CN102839276B - Method for ultrasonically loosening residual stress of connecting part of metal part bolt - Google Patents
Method for ultrasonically loosening residual stress of connecting part of metal part bolt Download PDFInfo
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- CN102839276B CN102839276B CN201210349683.2A CN201210349683A CN102839276B CN 102839276 B CN102839276 B CN 102839276B CN 201210349683 A CN201210349683 A CN 201210349683A CN 102839276 B CN102839276 B CN 102839276B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
The invention provides a method for ultrasonically loosening residual stress of a connecting part of a metal part bolt and relates to a method for loosening the residual stress of the bolt connecting part of the metal part. The method disclosed by the invention solves the problems of the existing method for loosening the residual stress of the bolt connecting part of the metal part that the processing efficiency is low and the processing time is long. The method for ultrasonically loosening the residual stress of the connecting part of the metal part bolt comprises the following steps of: 1, forming rigid contact on the surfaces of an ultrasonic probe made of metal and a nut of the metal part bolt; or forming the rigid contact between the surfaces of the ultrasonic probe made of the metal and a region of the metal part bolt, which is close to the nut; and 2, carrying out ultrasonic treatment. The method for ultrasonically loosening the residual stress of the connecting part of the metal part bolt disclosed by the invention is applied to the manufacturing field of high-precision instruments and meters.
Description
Technical field
The present invention relates to the method for a kind of lax hardware bolt junction unrelieved stress, be specifically related to the method for a kind of ultrasonic lax hardware bolt junction unrelieved stress.
Background technology
It is that hardware connects topmost a kind of mode that bolt connects, for dissimilar materials, while connecting by bolt, certain unrelieved stress generally can be preserved in screw thread and bolt contact surface part, if this unrelieved stress is larger, in use may be because material part be because of the creep unrelieved stress that relaxes, this situation for the Young's modulus such as aluminium alloy compared with low, yielding stress compared with more general for low material, above-mentionedly can lax unrelieved stress can be described as unstable unrelieved stress.Instrument for general precision, unstable residual stress relaxation process causes the deformation of member to ignore, but for high precision instrument instrument, if can not eliminate in time this unrelieved stress, in the use procedure of high precision instrument instrument, due to the progressively microsize variation of the lax member that causes of stress, finally cause component to lose efficacy, the error that therefore unstable residual stress relaxation produces can not be ignored, and lax hardware bolt junction unrelieved stress becomes the key issue of the manufacture of high precision instrument instrument.Hardware unrelieved stress is eliminated to conventional have Temperature Treatment and mechanical vibration and process, and for the unrelieved stress of bolt junction in hardware, processing efficiency low (being generally 30%～40%), treatment time long (being generally more than 2 hours).
Summary of the invention
The present invention is the method that will solve existing lax hardware bolt junction unrelieved stress, and processing efficiency is low, the problem that the treatment time is long, and the method for a kind of ultrasonic lax hardware bolt junction unrelieved stress is provided.
A method for ultrasonic lax hardware bolt junction unrelieved stress, specifically completes according to the following steps:
One, the ultrasound probe that is metal by material forms contacting of rigidity with the surface of the nut of hardware bolt, or the ultrasound probe that is metal by material forms contacting of rigidity with the surface in the region of closing on nut of hardware bolt; Wherein, the region of closing on nut be nut to sentence bolt axle center be initial point, to double the region in nut radius and not comprise the region of nut itself;
Two, carry out supersound process 10s～3600s, complete the lax of hardware bolt junction unrelieved stress.
Advantage of the present invention: the method for a kind of ultrasonic lax hardware bolt provided by the invention junction unrelieved stress can make the unrelieved stress of hardware bolt junction reduce more than 85% within the time of 10s～3600s.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of processing sample in test one; Wherein, 1 is integral support, and 2 is ultrasound probe, and 3 is steel alloy part, and 4 is joint bolt, and 5 is aluminum alloy part, and 6 is lifting table.
Fig. 2 is the nut place unrelieved stress of bolt and the graph of a relation of the time of supersound process of the sample in test one.
Embodiment
Below provide the specific embodiment of the present invention and be further described, yet technical solution of the present invention is but not limited to following cited embodiment.
Embodiment one: present embodiment is the method for a kind of ultrasonic lax hardware bolt junction unrelieved stress, specifically completes according to the following steps:
One, the ultrasound probe that is metal by material forms contacting of rigidity with the surface of the nut of hardware bolt, or the ultrasound probe that is metal by material forms contacting of rigidity with the surface in the region of closing on nut of hardware bolt; Wherein, the region of closing on nut be nut to sentence bolt axle center be initial point, to double the region in nut radius and not comprise the region of nut itself;
Two, carry out supersound process 10s～3600s, complete the lax of hardware bolt junction unrelieved stress.
Probe described in present embodiment is metal material, and easily processing, transmits ultrasonic ability good.
The contact of the formation rigidity described in present embodiment, ultrasonic energy can better be delivered on bolt, and adopts flexible medium to have a larger absorption to ultrasonic, ultrasonic large by flexible media power loss.
Present embodiment utilizes X-ray diffraction method to take bolt axle center as initial point to the bolt junction of hardware, the any point in the region in being three times in nut radius is carried out micro-sized stress measurement, if after ultrasonic elimination unrelieved stress is processed the unrelieved stress of material be less than this material yield strength 40%, and proceed after same supersound process, unrelieved stress variation is less than yield strength 20%, and the unstable unrelieved stress of bolt is lax.
The method of a kind of ultrasonic lax hardware bolt junction unrelieved stress that present embodiment provides can make the unrelieved stress of hardware bolt junction reduce more than 85% within the time of 10s～3600s.
The method of a kind of ultrasonic lax hardware bolt junction unrelieved stress that present embodiment provides, than utilizing, ultrasonic integral body is processed, can better utilised ultrasonic, efficiency is high, can be in the situation that identical ultrasonic power obtain better effect, simultaneously also little on the impact of other parts.
Embodiment two: the difference of present embodiment and embodiment one is: the external diameter of the nut described in step 1 is 1mm～20mm, the ultrasound probe described in step 1 and the surface of the nut of hardware bolt form rigidity contact that being shaped as of adopted ultrasound probe is bar-shaped, stepped, round table-like, the cross-sectional area of index shape, stretched wire shape, gaussian shape or cylindric and the ultrasound probe that adopts is 0.5mm
2～400mm
2; Ultrasound probe described in step 1 is round shape with the adopted probe that contacts that the surface in the region of closing on nut of hardware bolt forms rigidity, and the internal diameter of cylinder is than the large 1mm～10mm of the external diameter of nut, and wall thickness of cylinder is 2mm～15mm.Other is identical with embodiment one.
When the ultrasound probe described in present embodiment is bar-shaped, can better contact with bolt.
Ultrasound probe described in present embodiment can, according to the varying in size of bolt, adopt the probes of different sizes.Probe and the bolt close contacts of different sizes, make ultrasonicly to act near bolt to greatest extent.
Embodiment three: present embodiment and embodiment one or twos' difference is: the contact force of the nut of the ultrasound probe described in step 1 and the bolt of hardware is 1N～100N.Other is identical with embodiment one or two.
Embodiment four: the difference of present embodiment and embodiment one to three is: the ultrasonic frequency described in step 2 is 20KHz～100KHz, and ultrasonic power is 100W～1500W.Other is identical with embodiment one to three.
Adopt following verification experimental verification effect of the present invention:
Test one: the method for a kind of ultrasonic lax hardware bolt junction unrelieved stress, specifically completes according to the following steps:
One, metal ultrasound probe is formed to contacting of rigidity with the surface at the nut place of the bolt of sample, the diameter of ultrasound probe is 3mm
2, the diameter of the nut of bolt is 2mm, the contact force of the nut of the bolt of ultrasound probe and hardware is 1N;
Two, carry out ultrasonic 600s; Wherein, ultrasonic frequency is 20KHz, and ultrasonic power is 1000W.
In test one, the schematic diagram of processing sample as shown in Figure 1, Fig. 1 is the schematic diagram of test one processing sample, wherein, 1 is integral support (playing fixedly ultrasound probe and lifting table), 2 is that ultrasound probe is (bar-shaped, diameter is 2mm), 3 is steel alloy (3J33) part, 4 is joint bolt (diameter of nut is 3mm), 5 is aluminium alloy (Z1702) part, and 6 is lifting table (the surperficial contact force at the nut place of the bolt of adjusting ultrasound probe and sample is 1N);
Utilize the sin of X-ray diffraction
2Ψ method be take bolt axle center as initial point to the nut place of the bolt of sample, and any point in the region in being three times in bolt radius is carried out the measurement of the unrelieved stress of microcell, and data results as shown in Figure 2.Fig. 2 is the nut place unrelieved stress of bolt and the graph of a relation of the time of supersound process of the sample in test one.From Fig. 2, the unrelieved stress when nut that can observe the bolt of sample is in not through supersound process is 202MPa; Through overtesting one, provide method supersound process 300s time, the unrelieved stress at the nut place of the bolt of sample is 64MPa, than the unrelieved stress when the supersound process not, has reduced by 68.32%; Through overtesting one, provide method supersound process 600s time, the unrelieved stress at the nut place of the bolt of sample is 25.43MPa, than the unrelieved stress when the supersound process not, has reduced by 87.41%.
Claims (1)
1. a method for ultrasonic lax hardware bolt junction unrelieved stress, is characterized in that: the method for described a kind of ultrasonic lax hardware bolt junction unrelieved stress, specifically completes according to the following steps:
Step 1, the ultrasound probe that is metal by material form contacting of rigidity with the surface of the nut of hardware bolt, or the ultrasound probe that is metal by material forms contacting of rigidity with the surface in the region of closing on nut of hardware bolt; Wherein, the region of closing on nut be nut to sentence bolt axle center be initial point, to double the region in nut radius and not comprise the region of nut itself, the diameter of ultrasound probe is 3mm
2, the diameter of the nut of bolt is 2mm, the contact force of the nut of the bolt of ultrasound probe and hardware is 1N;
Step 2, carry out ultrasonic 600s; Wherein, ultrasonic frequency is 20KHz, and ultrasonic power is 1000W.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210349683.2A CN102839276B (en) | 2012-09-19 | 2012-09-19 | Method for ultrasonically loosening residual stress of connecting part of metal part bolt |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210349683.2A CN102839276B (en) | 2012-09-19 | 2012-09-19 | Method for ultrasonically loosening residual stress of connecting part of metal part bolt |
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| CN102839276A CN102839276A (en) | 2012-12-26 |
| CN102839276B true CN102839276B (en) | 2014-12-10 |
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| CN103045845A (en) * | 2013-01-21 | 2013-04-17 | 北京理工大学 | High energy ultrasonic field regulation and control method for residual stress |
| EP2918690A4 (en) * | 2013-01-21 | 2016-07-20 | Beijing Inst Technology | Method and system for locally regulating and controlling metal member residual stress |
| CN103861975A (en) * | 2014-03-11 | 2014-06-18 | 大连理工大学 | Method for forming metal wire based on ultrasonic vibration |
| CN104165717B (en) * | 2014-08-19 | 2016-08-24 | 华中科技大学 | A kind of lathe bolt junction stress mornitoring method |
| CN107576440B (en) * | 2017-09-21 | 2019-11-15 | 北京工业大学 | A kind of measurement method that residual stress influences tangential double bolt fastening structure relaxations |
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| US20050145306A1 (en) * | 1998-09-03 | 2005-07-07 | Uit, L.L.C. Company | Welded joints with new properties and provision of such properties by ultrasonic impact treatment |
| US20060016858A1 (en) * | 1998-09-03 | 2006-01-26 | U.I.T., Llc | Method of improving quality and reliability of welded rail joint properties by ultrasonic impact treatment |
| JP4319828B2 (en) * | 2002-11-18 | 2009-08-26 | 新日本製鐵株式会社 | Strength improvement method of cold-worked part by ultrasonic impact treatment and its metal product |
| CN2592332Y (en) * | 2003-01-20 | 2003-12-17 | 华东船舶工业学院 | Portable vibration processing device for eliminating welding residual stress |
| US20070068605A1 (en) * | 2005-09-23 | 2007-03-29 | U.I.T., Llc | Method of metal performance improvement and protection against degradation and suppression thereof by ultrasonic impact |
| JP4987816B2 (en) * | 2008-07-28 | 2012-07-25 | 新日本製鐵株式会社 | Automatic impact processing method and automatic impact processing apparatus for improving the fatigue characteristics of welded joints |
| CN101705462A (en) * | 2009-11-18 | 2010-05-12 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for eliminating welding stress of thin-wall piece |
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