VSR is a resonant device in the form of the substance to exert additional dynamic stress of the workpiece, when additional dynamic stress and residual stress superimposed, meet or exceed the material yield limit, the workpiece micro-or macro-plastic deformation occurs, thereby reducing both chemical components and internal residual stresses and dimensional accuracy to achieve stability.
VSR Technology Overview:
VSR technology, foreign called “Vibrating Stress Relief” (referred to as the “VSR”), designed by a dedicated VSR equipment, so that the workpiece is processed resonance, and in this way a certain resonance energy transfer to the vibration all parts of the workpiece, the workpiece micro-plastic deformation occurs within – the gradual recovery of the lattice is distorted equilibrium. Dislocation slip and re-pinning, and finally to get rid of residual stress and are, thus ensuring the stability of the workpiece dimensional accuracy.
VSR also known as vibration vibration to eliminate stress method, is the artifacts (including castings, forgings, welded components, etc.) in its natural frequency of vibration treatment for tens of minutes, remove and all of its residual stress, the dimensional accuracy to obtain a stable a method. This process has low energy consumption, time is short, the effect is remarkable and so on. At home and abroad in recent years has been rapid development and wide application.
VSR is a real resonance in the form of additional dynamic stress applied to the workpiece, when additional dynamic stress and residual stress superimposed, meet or exceed the material yield limit, the workpiece micro-or macro-plastic deformation occurs, thereby reducing both chemical components and internal residual stress and dimensional accuracy to achieve stability.
VSR reason to get all aspects of general importance, because it has the following characteristics:
1, less investment. Compared with the thermal aging, it does not require a huge time-furnace can save an area with expensive equipment investment. The large-scale modern industrial casting and welding parts, such as thermal stress relief you need to build a large aging aging furnace, is not only expensive, low utilization, and the furnace temperature uniformity is difficult to eliminate the stress of poor results. VSR can be used completely avoid these problems.
2, short production cycle. After months of natural aging at least long-term placement, shall also be required dozens of hours of thermal aging cycle to complete, and the vibration of VSR, only to tens of minutes to complete. Moreover, the VSR subject to site constraints, the workpiece can be reduced from the time before and after transport. If the vibration device placed in the machining production line, not only the production of more compact arrangement, and can eliminate the processing work generated stress on love.
3, easy to use. VSR equipment, small size, light weight, easy to carry. Complete set of equipment, the device itself but also the total weight 65KG. Because space is limited vibration aging treatment without vibration device can be brought to the scene. So this process compared with the thermal aging, easy to use and flexible.
4, strong adaptability. It is not part size and material constraints, from a few kilograms to several hundred tons of the workpiece can easily use the vibration aging technology, especially for large, medium, severe deformation of the workpiece and the workpiece thermal aging, it can show VSR its superior performance.
5, save energy and reduce costs. The resonance frequency of the workpiece under the aging process, energy consumption is minimal. Practice has proved that power with 0.25 to 1 horsepower mechanical vibration exciter can be 150 tons of artifacts. Therefore, a rough calculation of its thermal energy consumption of only 3 to 5% of the time, cost, thermal aging only 8 to 10%.
6, the mechanical properties significantly. After vibration treatment of the residual stress of the workpiece can be eliminated 30% to 55%, eliminating the high tensile stress area than the proportion of low stress District. Therefore, the workpiece can be used to improve strength and fatigue life, reducing stress corrosion. Can prevent or reduce the heat treatment, welding and other processes caused by micro-cracks. Can improve the ability of resistance to deformation of the workpiece, the workpiece accuracy and stability, improve the accuracy of the workpiece to improve the mechanical properties.
7, in line with environmental requirements. The aging process to avoid the waste heat aging of flue gas dust and other sources.
8, the other. VSR is simple, easy to implement mechanized automation. Can avoid the metal parts produced in the thermal aging process warpage, oxidation, decarburization, and hardness and decreased defects.
VSR technology compared with traditional thermal aging, has the following advantages:
1, the aging effect. A lot of research and practical applications show that the limitation of the workpiece VSR better than burning coal, heavy oil or gas heat aging furnace, aging furnace and basic with similar results, because not only overcome the VSR uneven oven heat aging eliminate the problems caused by uneven stress, and avoid artifacts due to heat and reduce the impact of its resistance to deformation, it is generally handled by the VSR parts than the average thermal aging stability of the dimensions of the workpiece can be increased by 30% or more.
2, the flexibility. VSR from the use of space technology, workpiece size, shape, weight and other conditions, because only a few dozen kilograms of VSR equipment, it may carry out on large workpieces aging. At the same time can be arranged according to process requirements of different manufacturing processes in the workpiece between the aging process.
3, solve the thermal aging furnace pit problem of environmental pollution. With the increasing demand on the environment, heat aging furnace flue gas pits, dust, slag, the problem has been restricted, VSR is able to completely avoid, which is the vibration aging technology by the National Environmental Protection Agency in recent years has been to promote the cause.
4, less investment. VSR equipment prices generally 6 to 10 million, will be able to meet hundreds of tons of the following parts of aging, while large parts of the furnace thermal aging cellars construction not only requires an investment of hundreds of thousands, and the large area, the application up not flexible, if the workpiece is not worth opening a small furnace, the workpiece is too large Shiyou does not fit heaters.
5, significant energy saving. VSR treatment one week down and only a few degrees electricity, heat aging compared with its base in more than 95% energy saving.
6, and high efficiency. Subject to natural aging six months to one year, more than a dozen thermal aging also needs to dozens of hours of a cycle, and VSR just 10 minutes to an hour to complete.
7, not particularly suitable for high-temperature aging of materials and components to eliminate the stress treatments, such as stainless steel parts, and some metal parts, welding parts and so on mechanical retirement.
Hawking which eliminate stress welding equipment, high-power principle is to use impact tools to promote Haoke twenty thousand times per second, the frequency of the impact of the metal surface, due to Haoke high-frequency, high efficiency and focus under the high-energy, the metal surface have a greater compression plastic deformation; Haoke shock while changing the original stress field, producing a certain value of compressive stress; and to be able to strengthen the impact site