Beijing Semboo Science and Technology Co,. Ltd

Process of foundry, forging, welding, cutting and application of metal will cause residual stress within the work pieces due to cold, heat or machinery distortion, which lead to unstable condition of work pieces and decrease dimensional stability and mechanical physical property. As a result, the work pieces will deform and be out of use under long time applying, and dimension precision can not be assured. Thermal stress relief and natural stress relief are generally adopted in the past to relieve the residual stress within metal work pieces. However, these two methods are of many defects and drawbacks: NSR costs too much time and area, and suits no mass production; while TSR costs too much money, area, affiliated equipment, and energy. It’s difficult to control temperature of furnace, therefore the work pieces burnt are easy to be oxidized, which adds to the work of cleaning, and crack under uneven heat. It’s also likely to cause new stress when they are getting cold. Besides, the working environment of TSR processing is severe with pollutant and low automatic mechanization. On the contrary, Vibratory stress relief saves substantial energy, decrease cost and time. Compared with TSR, Vibratory stress relief can save stress relieving cost more than 90%, energy 95%, and investment 90%. It cost half a year or two years to go through NSR, TSR one to two days, while Vibratory stress relief half an hour to one hour at most. The equipment is easy to carry, operate with high adaptability, automation and no restriction to place, size and weight of work pieces.

Vibratory stress relief meets the requirement of contemporary industrial society for energy and environment preservation, which makes it a trend for replacing the traditional TSR in some ways and becomes a revolutionary high-and-new tech. Vibratory stress relief has aroused tremendous attention and interest from mechanical manufacturing industry, and has been widely used worldwide in recent twenty to thirty years.

Vibratory stress relief Principle

Vibratory Stress Relief (Vibratory stress relief for short), is treatment to metal work pieces through controlled vibration power aiming to relieve the residual stress within work pieces.

Numerous application cases home and abroad prove that Vibratory stress relief functions is well to stabilize dimensional precision of components. However, there has been no systematic and satisfactory explanationup to now to the principle of how it actually manages to do it.

Analyzed from macro way, Vibratory stress relief causes plastic deformation in components, decrease and homogenizes the residual stress; improve anti-deformation capability of material, which is undoubtedly the basic reason to stabilization of dimensional precision. Analysis from stress relaxation and deformation of components indicates that the presence and instability of residual stress cause the relaxation and redistribution of stress, which makes components to have plastic deformation. Therefore, TSR is the general way to relieve and decrease residual stress, especially risk peak stress. Vibratory stress relief can also decrease residual stress by 20%-30% usually, sometimes up to 50%-60%, and at same time decrease the peak value of stress, which resulted in homogenization of stress.

Another important factor for dimensional stability of work pieces except for residual stress value is relaxation of rigidity, or anti-deformation capability of components. Although there is huge residual stress within, the components will not deform greatly due to its strong anti-deformation capability. In this way, Vibratory stress relief is obviously effective too. The loading test result of Vibratory stress relief shows that work pieces under Vibratory stress relief have better anti-deformation capability than those without, as well as those under TSR. Material is strengthening through vibration and its dimensional precision is stabilized.

Analyzed in micro way, Vibratory stress relief can be seen as an additional stress imposed on work pieces in the form of recycling loading. As it is known to all, engineering materials are not ideally elastic, in which there are various kinds of micro defections, especially cast iron where there are large amount of graphite of various forms that cut the metal. As a result, no matter what is steel, cast iron or other metals, the stress within are concentrated to some extent around its micro defections. The alternating stresses imposed on the work piece and the residual stress within the work piece overlap when the work piece is vibrating. When the overlapping of the stresses reach a specific limit, the part where the stress most concentrates will exceeds the yielding limit of the material and distorts , which will reduce the peak value of the residual stress and harden the metal itself. Afterwards, the vibration will work similarly on other parts where the stress concentrates, to the effect that the total value of the overlapping additional vibration stress and the residual stress will not cause any plastic deformation of the work piece, which marks the end of the process to relieve and homogenize the residual stress and harden the metal through vibration.

Controller: control the required vibration power, frequency produced by vibrator.

Vibrator: fix it rigidly on work piece, vibration force produced by it will vibrate the work piece, it’s composed of electric motor and eccentric wheel.

Influence of Vibratory stress relief on material property

Knowledge gained from production practice shows that Vibratory stress relief can relieve residual stress within work piece, and intensity of work piece after Vibratory stress relief is greatly improved as well. Which enlightens us that Vibratory stress relief on work piece will intensify materials.

Vibration strengthening is forced vibration of work piece under external recycling loading, with force coming from the eccentricity of vibrator. It’s forced vibration with various degrees of freedom and damping system. For convenience of analyzing, we simplify the system to a forced vibration with single degree of freedom and damping system. Mechanical model is as in figure 1.

The vibration force grows along with the increase of eccentric distance e and rotating speedω2. Therefore in practical use, alternating dynamic stress can be imposed on metal work pieces through readjustment the eccentricity and rotating speed of vibrator, while metal will have dislocation movement under the function of alternating dynamic stress.

When the value of alternating dynamic stress increased from zero to peak, increase with the alternating dynamic stress, the dislocation of metal material is exicited ,continuously release new dislocation, and pluged on the obstacle. The stress field which formed by the continuously increased dislocation pileups makes dislocation of the nearby crystal to have a trend to move. The pileup on the higher stress field is recanalized at first, the concentrated stress is released

During the value of alternating dynamic stress decreased from peak to zero, the balance of dislocation pileups was damaged. During the movement, a lot of dislocation will overlap with other dislocation, which increase the dislocation density. With the alternating of imposed dynamic stress, the above process is repeated, when the peak of inner stress decrease, at the same time dislocation is proliferation, the increase of the dislocation density is useful to improve of fatigue strength

Fatigue damage is 3-phased: fracture initiation, expansion of fracture and instant break. Fatigue life of metal material is mainly composed by emerging life of fracture and expansion life of fracture.

Fracture initiation is formed where the stress is the highest and intensity is the weakest. After Vibratory stress relief, high inner stress is decreased and homogenized, which reduce the influence brought by concentration of stress; at the same time, increase of dislocation density makes it harder for glide belt to slide, which will increase the life of fracture initiation. While the change in dislocation configuration and increase in dislocation density of the material will increase the resistance of gliding movement and power needed for expanding the fracture, which increase the expansion life of fracture, so that to improve fatigue intensity of material and enhance the material property.

Features of Vibratory stress relief

Vibratory stress relief has been successfully applied to components made of steel, cast iron, nonferrous metal alloy and so on in industries as mechanical manufacturing, aviation, chemical equipment, and power driven machines. Vibratory stress relief obtained tremendous attention from various fields, for the reason that it’s featured by:

●Less investment: compared with TSR, Vibratory stress relief needs no immense stress relief furnaces, and saves area and expensive investment in equipment. In modern industry, process on large castings and weldments to relieve the residual stress needs giant furnaces, which costs money with low utilization rate. It’s hard to homogenize the temperature in furnace, and ineffective. Vibratory stress relief can help avoid such questions.

Therefore, at present, large weldments in bridge, ships and chemical machinery of several meters to tens of meters, as well as heavy castings weighing several to tens of tons mostly apply Vibratory stress relieving.

●Short production period: it takes several months to relieve stress by laying aside through NSR, and it takes tens of hours to complete TSR, while it takes only tens of minutes through Vibratory stress relieving. Besides, Vibratory stress relieving attaches no requirement for ground, which shortens the time of back transportation of work pieces before and after stress relief. If Vibratory stress relieving equipment is installed on production line of mechanical process, the production arrangement will be closer and stress produced during machining can be relieved right away.

●User-friendly: small size, light weight, portable. Vibratory stress relieving equipment can be taken to the production field as it’s free from restriction to field. So compared with TSR, Vibratory stress relieving is more convenient and easier to adapt to all situations.

●Energy saving and cost reduction: It consumes little energy to relieve stress within work pieces under resonant frequencies. Practice proves that mechanical vibrator with 0.25 to 1 horse power can oscillate work pieces below 150 tons. So it is roughly estimated that energy consumption of Vibratory stress relieving is 3~5% that of TSR, cost 8~10%.

●Others: Vibratory stress relieving is simple to operate, which makes it easy to realize mechanical automation. Vibratory stress relieving avoids the problem of bending, deformation, oxidation, decarburization and abating of metal work piece in TSR process, and it’s the only way to do re-stress relief at present.

Vibratory stress relieving is originated in European and American countries after WWII. With the development of modern scientific technology around 1950s, Vibratory stress relieving theory, test technology and vibration equipment were improved rapidly. Processing time can be shortened when work pieces are vibrated under resonant frequencies, with better effect in stress relief and precision stability, as well as less energy consumption. At the same time, relevant Vibratory stress relieving equipment emerged, which was attached great importance worldwide and was rapidly applied to production.

With the ever growing of this process, vibration and controlling equipment are getting mature. Vibratory stress relieving is widely used in more than ten industrial developed countries. A certain American stress relief company possesses 350 sets of Vibratory stress relieving equipment and do Vibratory stress relieving process on more than 5000 projects. Britain and West German applies Vibratory stress relieving to weld beam and framework of plane assembly jig. Experiment and Scientific Research Institute of Metal Cutting Machine Tool in Former Soviet Union recommended Vibratory stress relieving process to various machine tool factories. In some heavy machine tool factories, large work pieces and basic components all adopted Vibratory stress relieving.

Under the backdrop of energy shortage and deteriorate ecological environment, highly-efficient and environment friendly Vibratory stress relieving process is rapidly developing both home and abroad in recent twenty to thirty years. Now USA, Britain, German, France, Russia, Canada, Belgium, Romania, Japan and so on have applied Vibratory stress relieving on work pieces of casting, forging, welding and nonferrous metal in heavy and light industries as aviation, ocean, exploration drilling, mining, machine tool, textile, paper making, oil transportation and so on. There are well-known Vibratory stress relieving equipment manufacturer in USA, German, France and Britain.

Vibratory stress relieving was introduced to our country in 1970s. In 1974, Beijing Machine Tool Research Institute formally listed Vibratory stress relieving process in their research subjects, and began to make research on application of Vibratory stress relieving process by machine tool cast iron. Through years’ research, fundamental Vibratory stress relieving process is determined and its effect is recognized.

With the probation and deepening of research, Vibratory stress relieving was put in the content of “Research on improving quality of machine tool casting”, one of the 38 key problems to be tackled during the “Sixth Five Year Plan”. Beijing Machine Tool Research Institute was in charge of research on the practical use of Vibratory stress relieving. The research task was duly completed. Report from “Sixth Five Year Plan” authenticated that Vibratory stress relieving process research has leveled global advanced technology. In the “Seventh Five Year Plan”, Beijing Machine Tool Research Institute shouldered task of national key subject, “Research on digestion and absorption of crucial project of one-stop Vibratory stress relieving process on CNC welding work pieces”. Vibratory stress relieving in our country has become mature after the “Seventh Five Year Plan”.

Vibratory stress relieving equipment also reached the advanced world level, and satisfied the requirement of Vibratory stress relieving technology. Vibratory stress relieving was named one of the six key extension technology by national science committee、electro mechanical department、production department of the state council on the 8th five year period. Vibratory stress relieving was appointed national key extension project by former National Economics and Trade Committee on 1999.on July,1999 Chinese Mechanical Engineering Society set up technology committee of stress relief, then we have the national academic organization which aim to study stress & deformation, on 2000, The former National Economics and Trade Committee appointed the updated Vibratory stress relieving equipment as the national key technology innovation project; On 2001 The former National Economics and Trade committee supported the standard revision work by project establishment, and on Agu,2001, Chinese Mechanical Industry Association issued paper which officially named the Vibratory stress relieving as the manufacture standard of machine tool, then revised the Vibratory stress relieving as the manufacture standard of casting 、forging、welding and other manufacturing.

Vibratory stress relieving was from vacancy to a certain scope. Now several thousand Vibratory stress relieving equipment were applied to the following field: Machine tool、Mould、Forging、woodworking、Aviation、Spaceflight、metallurgy、Mining、Railway、Shipbuilding、Textile、Nuclear Power Station, etc.

There are some questions on the traditional Vibratory stress relieving,which prevent Vibratory stress relieving to become the formal process flow, and adopted TSR on many home & aboard mechanical manufacturing field

Vibratory stress relieving has obvious advantage on the high efficiency 、Energy Saving、Environment Protection, but Sub-resonance which is a traditional Vibratory stress relieving technologyexisted theseveral decades unsolved technical problem, which prevented the Vibratory stress relieving to be named the formal technology process and accepted by widely enterprise

Sub-Resonance: Scan from low speed to the motor rated speed, search for the formant, confirm the main & accessorial vibration frequency and scanning scope during sub-resonance section and carry on several ten minutes vibration process on the sub-resonance frequency
Problems of sub-resonance
It’s very complicated to adjust the work piece when single piece is being manufacturing, as the support point and vibration point of the vibro-pickup are hard to set to the optimal condition, as a result, Vibratory stress relieving can only be operated by trained experts, it’s difficult for common workers to handle this technology even through training; one work piece needs one kind of process specifically; The operator should know how to confirm processing parameters, which stages a high requirement for the human skills.
Due to limited rotating speed of motor, Many work pieces, because of the high rigidity and internal frequency, fail to vibrate without the same resonant peak; covering only 23% of the machinery manufacturing industry.

Few availability vibration frequency, the stress relief can not be reached a optimal effect ,due to the stress relief was instability
Noisy

5. Application of Harmonic Frequency Spectrum in Vibratory stress relieving Field.

With regard to the improvement of Vibratory stress relieving tech, researchers from various countries set their direction of research and breakthrough by solving problems as improving the rotation speed of vibrator to find frequencies of materials with high rigidity, and formulating Vibratory stress relieving process schemes for various work pieces. However, they encountered with a new bottle neck, in which the increase of motor rotating speed met many technical problems, and the incessant emerging of new material and new equipment has made the formulating of process scheme more complicated. At the same time, problems of big noise, high working current and heating of motor haven’t found a solution.

In the late 20 to 30 years of 20th century, Vibratory stress relieving entered a phase of slow development. However, with the rapid development of electrical equipment, controller was developed from simple human controlled to single chip, then to computerized equipment. It’s more convenient and quicker to use the computerized controller and supervision. But the key question still remained—limited application scope, big noise, few vibration types, ineffective after processing, too much human factor which interfered the process, complicated formulation of schemes. Vibratory stress relieving was laid aside temporarily in some enterprises. Equipment purchased before were laid idle or used as experiment machine for research in the lab. Thermal furnace which causes pollution and wastes energy, on the other hand, came into use again. Vibratory stress relieving left only shadow in the enterprises.

In the beginning of 21st century, a new Vibratory stress relieving tech emerged in China, which abandons the entire original Vibratory stress relieving problem solving methods, and pioneered a new road in explaining the true value of Vibratory stress relieving from a new perspective. The novel tech broke through the old bottle neck and embraced a whole new era of Vibratory stress relieving.

The reason that was named after frequency spectrum harmonic technology is its special mode of searching for frequency and process frequency. Frequency spectrum harmonic technology dose not continue to adoptthe original scanning mode, which dose the frequency spectrum analysis to search for the several ten harmonic frequency by Fourier Method, and select five optimal harmonic frequency which are effective to relieve the residual stress to be processed during the several ten harmonic frequency, and reach to relieve stress Multi-dimensionally & improve dimension precision stability

Frequency spectrum harmonic mode can find 5 different harmonic peak, no matter how the work piece dimension、rigidity degree 、material property. It is not restricted by the vibrator rotation speed, no special requirement for the exciting point and support point,process high rigidity & high nature frequency work piece which can not be processed by sub-resonance, satisfy the requirement of work piece which required high dimension precision, low noise, covering 100% of the mechanical field. The rotation is under 6000RPM and solve the problem of loud noise which produced by sub-resonance equipment

Type	Semboo Navigator Vibratory stress relieving	sub-resonance equipment
Form	frequency spectrum	sub-resonance
Frequency searching method	frequency spectrum analysis	scanning
Frequency searching time	50 seconds	5-12minutes(1000~10000rpm)
Scanning before vibration?	no	yes
Scanning after vibration?	no	yes
effective frequencies	five effective frequencies	few or none
Process formulation form	automatically	manually
Positioning of Vibrator, support point, and sensor	No special requirements	Strict requirements
noise	low	loud
High rigidness, high natural frequency work piece	all can be treated	Can not be treated
Requirement for work piece technology	Very high	Very low
covering	100%	23%
equipment supplier	Beijing Semboo Science and Technology co,.ltd	Many suppliers
application	Work pieces of complicated structure, high rigidness and high natural frequency which can not be treated through sub-resonance, and of high accuracy and safety	Work pieces of simple structure, low rigidness, low natural frequency and low requirements for technology.

The owner of the patent is Beijing Semboo Science & Technology Co.,Ltd, the “Navigator Expert System For Vibratory Stress Relief”which adopt the frequency spectrum harmonic technology has been first applied to some high-tip industry,for example: China Aviation、Spaceflight、Weapon,etc, solve the many years perplexed problem in these industries, and be named the formal process setting scheme .Because a higher cost of the equipment and the shadow brought by the traditional Vibratory stress relieving,The new technology is not been widely adopted by many civil mechanical manufacturing .

But the new technology solves the many years technology difficulty, and make the phenomena ofVibratory stress relieving replace TSR to become reality

The effect report from some clients which adopted the Navigator Expert System For Vibratory stress relieving

Manufacturer	Work Piece	Comparation
Beijing Satellite Manufacturer	1、Aluminum Alloy Beam L×W×H＝200×12×14cm 2、Aluminum Board L×W×H＝30×15×0.8cm 3、Aluminum Alloy vertical ring（Bason shape） H＝1.5mD＝1.5mWall Thickness＝24mm	1、Before：Two ends wrap after finish machining，Tolerance:about 8mm，工Requirement:2mm；After：Solved。 2、Before：Deformationafter finish machining with TSR:1.5mm，Rewuirement:1mm；After：0.7mm。 3、Before：high vertical tolerance: 0.8mm，Requirement:0.05mm；After：Satisfied
Inner Mongolia First Macinery Group	washer & Car Body	Before：washer produced a higher deformation，affect precision；After：deformation of car body later bridge decreased by 60%,qualified rate 94.4％，washer roundness:100％，replace tempering。
FengHua Aviation State-owned Machinery factory	magnesium alloy casting	Before：Deformation after finish machining with TSR: 3mm；After： deformation:0.23mm。
Beijing Aviation material research institute	High strengh alluminum alloy terminal cover & baffle	Before：qualified rate after TSR:40-50％，After：Process above 50,000Pcs one batch, qualified rate above 95％。
Beijing People’s Printing Group	Main parts of printing machinery	Before：cost of TSR RMB1,859,000/Year。 After：cost of Vibratory stress relieving RMB825,000 /Year
Tianjin Sanda Casting Co.,Ltd	Machine Tool	Before：cost of TSR above RMB2 million/year After：with Vibratory stress relieving, the cost of power about RMB several thousand/Year

Replacing TSR is a trend: There are 3 far-reaching great reform when enter into industrial society, The symbol of the 3 industrial revolution is the invention of steam engine in the 18th century、 the invention of generator in the early 19th century and the invention of computer in 20th century. The 3 reform pushed the society productivity to a rapid development, change the way of life, but It destroyed the living environment, make the earth bug, we have to face to more and more serious environment problem. Resource is non-renewable, destructive environment is difficult to revert. Energy-Saving, Emission Reduction is the main task of very government

Energy-Saving, Emission Reduction is the main task of government sectors, It issued clear aim for the Energy-Saving, Emission Reduction during the 11th “five year plan”. The Party Central Committee and the State Council put forward specific guidelines for the development of recycling economy、energy saving and environment protection. On the 17th national congress of CPC, President Hu Jintao pointed out to develop and popularize advanced applied technology of saving 、replacing、recycling and pollution treatment, develop clean & renewableenergy ,protect land and water resource, set up scientific& reasonable energy resource utilization system, improve energy utilization efficiency.. develop environmental conservation industries. increase spending on energy and environmental conservation with the focus on intensifying prevention and control of water, air and soil pollution and improving the living environment for both urban and rural residents.

On national energy saving & emission reduction telephone conference,The premier Wen Jiabao mentioned to organize science && technology special action of energy saving & emission reduction, set up a batch of national project lab and national key lab, overcome key and common technology of energy saving & emission reduction.Efforts should be made to actively promote the innovation in energy saving and emission reduction, as well as the establishment of result transferring system, which take enterprises as its subject and combine production, study and research. We should also enhance the independent and innovative ability of enterprise. In key industries as electric power, steel, iron and nonferrous metallurgy, energy saving and emission reduction technology of great potential and wide application scope shall be promoted. Policies should be formulated to encourage, support and guide the technical restructuring of energy saving and emission reduction of enterprises, which should apply the new equipment, process and technology.

On mechanical manufacture industry, Some technology process of high consumption、high pollution will be greatly restricted. Comparing to TSR, Vibratory stress relieving has inimitable energy saving & emission reduction advantage, and excellent performance on other parts

Stress Relief Mode	Heating Furnace(15T)	Vibratory stress relieving（one set of frequency spectrum harmonic Vibratory stress relieving）
Purchase Cost	It takes a long time to set up furnace	It is a portable equipment
Period	12Hour	1Hour
Energy consumption	High(Mainly coal, gas, electricity） When operate one time（about 12H），cost is RMB 3000-5000	Low（kilowatt-hour per hour, energy consumption is 0.2% of TSR, cost is 8-10% of TSR）
Occupied Space	It needs fixed space, non-moveable, occupy large space	No requirement of the fixed space, ,moveable, convenient to use, AC power is OK
Work piece size	Not to realize heating process for big size or long length（Difficult to process the length which is more than 5M）	No requirement of the work piece size, to adjust vibrator model to realize stress relief
Process effect	1、the temperature is different among furnace door、inside、middle the effect is not stable at different point	1、vibrate in one part, relieve the part where residual stress concentrated with more frequency
Alter material structure property	1.It will happen to alter structure property for complicated material 2、not suitable to adopt TSR for aluminum alloy new material which is easy to be altered property at low temperature	Not alter material structure property, suit to relieve stress for Al alloy、Ti alloy
Pollution	Serious	No(to relieve residual stress by mechanical energy, no pollution）
Other benefit	Improve efficiency. The economy & social benefit of energy saving & emission reduction is unable measured

The application of new frequency spectrum harmonic technology on Vibratory stress relieving field, which make the phenomena of Vibratory stress relieving replace TSR to become reality and necessity development, It is the necessity trend and development requirement that latest green craft replace the old craft with high consumption、high pollution .It will meet a Vibratory stress relieving popularization year on 2009, maybe advanced to 2008

Providing Continuous growth ability for enterprise is the development future

In order to adapt to the competition, the manufacturer will adjust its product based on the change of market requirement. The application of the new technology and new material brings more development opportunity. But the enterprise will have to face to new question: Whether the existing production equipment ,process equipment can satisfy the production requirement after adopting new technology、 new material or not.

As the service mode provided by the original equipment supplier, the answer is no. They can only provide warranty within the finite period, solve the existing problem. The enterprise needs to purchase new equipment、new technology plan to solve the new requirement. For each production adjustment, the enterprise will have to face to some necessity process of technical research, equipment reformation. It will bring expensive cost, reformation difficulty, idle of the original equipment, capital waste and the possibility of lost risk.

It is more important to get a incessant growth ability of solving problem than to get a most advanced equipment. Equipment supplier needs to consider of how to provide service and change to help enterprise to improve ability.

On the 1968, USA economist Fox mentioned the following view on his classic Service Economy: “We are in the service economy……，more than half of the population is no longer engaged in the production of food、clothes、house、car and other visible product.”

The “revolution declaration” of Fuchs was developed on 1970s and appeared “post-industrial society”.On 1973, USA sociologist Daniel. Bell published The Coming of Post-industrial Society, analyzed the main character of post-industrial society and mentioned:” If we define the society quality with commodity on industrial society, that is to say we will define society quality with service on post-industrial society”. The service includes service activity which belong to the traditional service industry range, and the service activity belongs to before-sale, on-sale, after-sale in manufacturing

According to statistics, the service industry accounts on at least 65% on the total economy activity, which is two times of our present proportion. It is predicted that the gap in the Chinese service industry will be a great opportunity. At the same time, the manufacturing which concentrates on production and developed several hundred years will extend to service aspect.

The service which aims on the manufacturing product in pure material form is being developed to the advanced service which includes manufacturing product in pure material form and the more and more non-material form. It is the great advancement of history and the great development and advancement of manufacturing.

World manufacturing development, the increase of the service proportion is the main symbol that manufacturing changes to the advanced level. The application of high tech provides wide support to the development and advancement of manufacturing service ability.

From the view of global, the modern industry on developed country has entered to the stage of manufacture/service, and the service is the direction in future, The 40% -50% of the production value is service on the first-class firm.

In a word, providing service to client is not only the client requirement, but also the requirement of the supplier continues to develop. Many international enterprise has been executing the change or has finished. To our theme, stress relief is a key flow in mechanical machining, in the future development, It is a necessity trend that Vibratory stress relieving replaces TSR, under the support of new technology, It is a basic development direction that excellent supplier provides high performance service, and provides solution to continue to relieve the residual stress, which is a final aim of completely changing the present old process.