• 专利附录
  • 专利说明
  • 权利要求
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    • 专利摘要:
    The invention relates to a method for residual stress relief, wherein by means of mechanical stress detection voltage zones detected throughout the area and the extent of the voltage is determined in each case. The stress zone is subsequently relaxed by means of corresponding local acoustic vibrations, whereupon the stress relieved stress zones are checked again by means of mechanical stress detection.
    公开号:CH714900A2
    申请号:CH00445/18
    申请日:2018-04-08
    公开日:2019-10-15
    发明作者:Chen Jie-Wei；Illi Richard
    申请人:Crossnet Consulting Ag；
    IPC主号:
    专利说明:

    Description The inventors propose an innovative solution to prevent fatigue failure. The solution is based on the detection of the location and the size of residual stresses and the subsequent focusing of the process for removing mechanical stresses (namely vibration techniques) on these predefined areas in a very efficient and effective manner. After removing the residual voltage, the residual object is checked again as confirmation by the residual voltage detection method. All data can then be stored in the Asset Integrity Management Software, enabling a highly efficient and effective method for error prediction and prevention of fatigue failure.
    The present invention serves as a method of predicting and preventing fatigue failure, primarily through fatigue cracking, on both ferrous and non-ferrous metals. The invention serves as a unique method of preventing material defects and extending life, especially in combination with an "integrity management software system" in which data can be stored and used for planning inspections, stress relief and other life-extending measures. The method combines «residual voltage detection technology» with «residual voltage removal technology».
    There are 3 methods that make up the complete method. First of all, a residual voltage detection process, preferably the “metal magnetic memory method”, is carried out on the relevant metal object or the metal structure. This procedure precisely captures both the location and the magnitude of the residual mechanical stresses that are present in the metal. With this information, the second method for residual stress removal is used in a very targeted and highly effective manner. Finally, the third method is used, preferably using the “metal magnetic storage method”, in order to recognize the remaining residual stresses within the object as confirmation of the removal effect of mechanical residual stresses. It is possible to use this method for objects in a dry environment as well as for underwater objects.
    Compared to today's simple non-destructive testing methods and standard methods for removing residual stresses, there are several important advantages in using this unique method. The combination of the two methods (detection and removal) offers owners of metal structures a unique solution. It is now possible to integrate the raw data and information generated with this method into most of the "Asset Integrity Management" software systems that are common today. This not only enables a much more effective prediction of future incorrect processing, but also a preventive way that allows the initial stresses to be removed. The overall benefit for the system owner is a greatly reduced risk of damage (often life-threatening), which often means a significantly longer service life. The use of this invention serves to enable increased plant safety and often enormous cost savings.
    Summary There is a long-standing and costly problem of residual stress in metal objects and structures in today's industry. These “invisible” residual stresses can often be the cause of critical and catastrophic fatigue fractures. There are methods of detecting these residual stresses that provide the situation regarding the location and extent of the mechanical stress. Customers and plant owners currently use this information exclusively for safety assessment or possible repair and maintenance measures without preventive thoughts. The removal of residual voltages is also possible, namely through the acoustic vibration. But these two methods are currently used separately. Today there is no preventive solution to fatigue failure caused by the presence of undesirable residual mechanical stress.
    Material fatigue problems are caused by the dynamic and thermal stress during the application and manufacturing process and are often the cause of cracks and corrosion. In addition, there is a general need in the skin industry to reduce the weight of the components to save costs or to increase their resilience (weight, pressure, temperature) to enable higher performance. This new requirement also increases the occurrence of such fatigue cases due to unavoidable residual stress, so that the expectation of a complete, effective and preventive technology is more fulfilled by the combination of stress detection and stress removal methods.
    The major industries in which catastrophic failures occur are energy, oil and gas, offshore, aerospace, rail, and civil structures. If failures occur, devastating deaths, long downtimes and extreme total costs can often result. In the aerospace industry, partial distortion (and possible failure) due to inherent internal stresses resulted in repeated concessions, rework, and potentially multi-million dollar scrap in the development and manufacturing lifecycle phase. Many deadly events on the high-speed line were attributed to the presence of residual stresses in wheel and axle parts. Oil and gas pipelines and constructions are susceptible to failure due to long-lasting residual stresses caused by the load as well as by initial molding and welding processes. Welded connections on offshore drilling rigs are also exposed to constant loads and loads from rough sea conditions. The same applies to ships such as floating production storage and offloading ships (FPSO), which additionally cope with the stresses of the cyclical load, particularly in fatigue
    CH 714 900 A2 exposed areas. When welds reach the end of their known lifespan, customers face the challenge of repairing and maintaining failed joints. Normal repairs to these highly stressed connections are often only temporary and not sufficient for long-term operation. The cost of failure in this industry can be massive in terms of loss of life and loss of production, which can often be in the tens of millions.
    权利要求:
    Claims (10)
    [1]
    claims
    1. A method for highly effective and targeted mechanical residual stress relief for both ferroelectric and non-ferroelectric material (3) by the combination of the mechanical voltage detection technology (1) and the acoustic vibration technology (2), being the first detection technology of mechanical stress for localization (5) and the determination of the extent of the residual mechanical stress (4), so that the process of residual stress relief through local acoustic vibration is carried out in a targeted and effective manner (Figure 2) and the result of the residual stress relief is checked again by means of mechanical stress detection technology (Figure 3), characterized in that the residual stress relief by acoustic vibration is only carried out specifically after the localization of the mechanical stress zone and the coordination of the extent of the stress and before the residual stress relief process the mechanical stress zone by h the measuring device (1) is detected area-wide.
    [2]
    2. The method according to claim 1, characterized in that the workpiece (3) is first scanned without gaps by a movable measuring device (1), preferably by the «metal magnetic memory», for the detection of the mechanical tension.
    [3]
    3. The method according to any one of the preceding claims 1 or 2, characterized in that the result of the mechanical residual stress on a two-dimensional level is visualized by software, wherein the size of the stress zone and the strength of the mechanical stress are recorded.
    [4]
    4. The method according to claim 2 and 3, characterized in that the result of the first recording of the actual situation of the mechanical residual stress for the risk assessment and integrity management is stored and applied.
    [5]
    5. The method according to claim 4, characterized in that the result of the measurement of mechanical residual stress is used for the exact planning of the acoustic residual stress relief, not only to determine where the residual stress (geometrically) must be reduced, but also to determine how much the acoustic vibration (temporally) must be used so that the action of the mechanical residual stress relief can no longer be carried out blindly, but can be carried out in a highly efficient and targeted manner.
    [6]
    6. The method according to claim 4 and 5, characterized in that the acoustic residual stress relief by the advice of MMM massively reduces the amount of time spent on work and the risks for the object, the residual stress relief gaining economic and technical importance.
    [7]
    7. The method according to claim 1, characterized in that the result of the residual stress relief is checked again by the detection method of the mechanical stress in the selected processing zone to be sure that the mechanical stress has actually been removed.
    [8]
    8. The method according to claim 1 and 7, characterized in that the mechanical residual tension is visualized after the acoustic vibration treatment and is stored together with the situation before the treatment in the program of integrity management (Figure 4), so that it for further risk assessments of the object can be used.
    [9]
    9. The method according to claim 1 and 8, characterized in that the entire method regarding the treatment of the mechanical tension is carried out step by step exactly according to the definition of the integrity management (Figure 4).
    [10]
    10. The method according to claim 1 and 9, characterized in that the technology of mechanical residual stress detection and the technology of mechanical residual stress relief through the program integrity management (Figure 4) are linked to each other in terms of content and provide the most important findings and raw data on the subject of risks of the counter-object, so that the Integrity Management program (Figure 4) can take the historical situation into account and offer a better opportunity to assess the risks of the counter-lens and to predict further trends.
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    同族专利:
    公开号 | 公开日
    CH714900B1|2021-01-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    CN112427889A|2020-11-04|2021-03-02|中国航发南方工业有限公司|Method for reducing residual stress of forged and extruded blade|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    CH00445/18A|CH714900B1|2018-04-08|2018-04-08|Measurement of residual stress and residual stress relief through acoustic vibration.|CH00445/18A| CH714900B1|2018-04-08|2018-04-08|Measurement of residual stress and residual stress relief through acoustic vibration.|
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