Gush bolus figuration and school form technology study high-energy ultrasonic progress

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With high frequency rate (be in commonly 20kHz above) , the ultrasonic that is as high as several kilowatt power regards energy as the source, through transducer changeover is the longitudinal wave machinery that is the same as frequency oscillatory energy, repass luffing lever undertakes enlarge, the action of mechanical energy bow wave of high energy density at metallic surface, make plate makings happens bend be out of shape, implement the gush bolus figuration that plate expects and school form from this. As a result of its process and principle are similar to conventional gush bolus technology, call so " figuration of ultrasonic gush bolus and school form " . In recent years, as the development of ultrasonic technology, especially high-power is supersonic those who pound equipment to make a technology is increasingly mature, the plasticity take shape that the bow wave that uses high-energy ultrasonic generation has plate expects and school form became a possibility. High-energy ultrasonic gush bolus figuration and school form technology its facility cost performance of low, work tall, applicability is wide, and process environmental protection, in the United States and Europe the aerospace branch of a few countries had gotten important applying [1-2] , but the research of our country and application still are in start level. Figuration of ultrasonic gush bolus and school form technology gush bolus technology uses 1 fundamental ultrasonic the ultrasonic classics of high energy density pounds medium (steel qualitative firing pin or bullet) surface of concussion metal stuff, arise in metallic stuff surface ambitious succumb at material trends the tremendous wallop of intensity, cause the plasticity with material acuteness surface to be out of shape thereby. Because this kind of acuteness plasticity is out of shape and the microcosmic organization of material surface layer gets huge breaks change (can amount to accept rice level) , generation is concentrated, even and a stable fault is proliferous. Meanwhile, material interior is revulsive arose tall remains pressing stress distributings, when remains presses stress to accumulate certain level, board makings can happen to bend macroscopically be out of shape make force fastens its interior to achieve a balance afresh, form new in-house stress to distributing. Through adjusting the different parameter of ultrasonic gush bolus, can produce corresponding leftover stress field to distributing, implementation board material is glossy the accurate figuration of curvature and school form. Ultrasonic of 2 technologies characteristic gush bolus figuration and school look look relatively at other figuration and school form method, technical advantage is very clear, basically reflect in the following respects. (1) the figuration that can realize larger board. As a result of its peculiar tall meet an emergency leads effect, can produce the remains with extent and bigger deepness to press stress field, implement the figuration of bigger curvature radius and school form, in thick board local figuration and school form respect have distinct advantage. It is OK to go up at the aluminium alloy plank of 22mm not quite in ply figuration and corrective appearance, and figuration of bolus of traditional and mechanical gush criterion because board is too large and cannot effective figuration and school form. (2) the figuration that can realize complex form workpiece and school form. Construction of facility of ultrasonic gush bolus simple, operation is convenient, can be opposite complex structural member (like housing) undertake local figuration is handled, the craft parameter of equipment is little (norms of the frequency of ultrasonic generator, firing pin, amplitude) , it is good to can charge a sex, be out of shape to differring diagnostic figuration and school form process choose applicable equipment technology parameter, controallable the leftover stress size of plate makings surface and deepness, achieve control plate to expect the surface is leftover thereby of stress field distributing, can implement the accurate figuration that plate expects and school form. (3) the material integral performance after figuration is otherer method of gush bolus figuration is good. Compare with photograph of figuration of other spray bolus, the plank surface after figuration of supersonic gush bolus smooth, surface roughness is good. Perpendicular direction bumps firing pin material surface, and speed should be less than traditional pill, the circularity that firing pin bumps place and precision of exterior surface roughness are tall, and the workpiece surface surface roughness after these elements make gush bolus is handled is worth drop. Besides, the remains that while ultrasonic gush bolus has take shape, produces presses stress is bolus of traditional in season and laser gush bolus is multiple, bigger remains presses stress to be worth those who improved workpiece data to fight exhaustion, fight corrode reach fight metabolic ability. (4) free from contamination. Figuration of mechanical gush bolus needs to be in after gush bolus ends, undertake collection to the bullet every time, clean, classification and broken bead purify, and the medium of bolus of steel qualitative gush that figuration of ultrasonic gush bolus uses wears away not easily, long after action wears away very convenient also change, it is production technology of green of a free from contamination. (5) the cost of equipment is low. Ultrasonic generator dimension lesser, specific power consumption is low, whole ultrasonic gush bolus device but make it shift is portable, applied place is unlimited, can undertake in workshop product line the spot works completely. Figuration of bolus of gush bolus aggrandizement, ultrasonic gush and interconnected system of body of school of ultrasonic gush bolus call 3 research and applied progress ultrasonic technology of ultrasonic gush bolus, it is recently ten years technology of arisen a kind of finishing. Technology of aggrandizement of ultrasonic gush bolus basically is to use bullet or firing pin to undertake to metallic stuff surface high speed repeats concussion to make its produce sclerotic layer, raise the goal such as the exterior intensity of metallic spare parts, fatigue life in order to achieve. Form of school of ultrasonic gush bolus and figuration technology are produce leftover stress through bumping, force board makings generation is macroscopical bend be out of shape, in material " add life " while, achieve the goal of figuration and school form. Technology of aggrandizement of ultrasonic gush bolus matures quite relatively, already had wider application and research report [3] , and figuration of ultrasonic gush bolus and research of form of school of ultrasonic gush bolus and applied report are less. 2005, wu Kelan Prokopenko [4] offers facility of a kind of new-style ultrasonic gush bolus patent, use firing pin to regard a tool as the head, call ultrasonic gush bolus again. They handle large plane with this equipment, raised exterior hardness effectively, the exterior surface roughness of material also bolus of excel tradition gush. 2006, russia Statnikov [5] was compared what use firing pin and pill effect in ultrasonic gush bolus is different. The stress that the technology of ultrasonic gush bolus that the result proved to use firing pin produces in material surface place should be more than common ultrasonic gush bolus. 2007, the Rodopoulos that England thanks phenanthrene Er heart to with a ha strap Mu university [6] contrasted bolus of numerical control gush, laser gush bolus and supersonic gush bolus (tool head is firing pin) 3 kinds of kind are right the improvement of life of exhaustion of 2024-T351 aluminium alloy the effect: (1) craft of 3 kinds of finishing all can press stress in exterior generation remains, stress amplitude is 220MPa left and right sides. Before two kinds of means are in place of M of μ of distance surface 100~300 to be able to arise to press stress higher with evener remains, and supersonic gush bolus is in distance surface 0.

14~1.

It is better that 1mm is in the remains of generation to press stress. Laser gush bolus and the biggest remains that supersonic gush bolus produces press stress layer for 1.

6mm left and right sides, bolus of numerical control gush is 1.

1mm. (2) the improved material appearance hardness with bolus of numerical control gush and supersonic gush apparent bolus, and the effective deepness of supersonic gush bolus is close friends at bolus of numerical control gush, 150 μ M handles appearance of distance of consist in of its peak value. And the effect that laser gush bolus produces is lesser, but oversight. (3) bolus of numerical control gush rose to exterior surface roughness 18% , laser gush bolus 7% , supersonic gush bolus 8% . The result makes clear, material classics ultrasonic has best integrated and mechanical property after gush bolus. French SONATS company began the research of technology of ultrasonic gush bolus 1996, development gave equipment of bolus of the first ultrasonic gush and its corresponding ultrasonic gush ball 1999 craft, already popularized application to wait for an industry at aerospace, shipbuilding and car at present. SONATS company is local to wing envelope be out of shape undertook orthopaedic is handled (if pursue,1 is shown) [7] . 2001, KSA company begins research and development equipment of bolus of gush of 7 axes numerical control, be in later main effect was produced in a lot of project such as the A380 that cooperates with airbus company, A318/A340. Develop up to now, had made the aircraft on international the advanced engineering technology of large panel figuration, but what as a result of plane wainscot at the same time the measure of object of this kind of figuration passes property of big, material is inhomogenous wait with treatment sclerosis cannot be forecasted accurately or online the element impact that calculate, the aviation structural member after digitlizing gush bolus figuration still needs to use convenient, agile ultrasonic gush bolus to have local figuration and school look, KSA company put forward to use figuration of ultrasonic gush bolus and school form technology. Company of Integrity Testing Laboratory of Nextpage United States and French SONATS company put forward to use manipulator arm to undertake counting accusing the technology of figuration of ultrasonic gush bolus at the same time. Graph the 2 manipulator arm numerical control that develop for Integrity TestLab company are supersonic equipment of gush bolus figuration, the numerical control that took the lead in pushing figuration of ultrasonic gush bolus and school form installation is changed. In branch of plane of Xi'an of ship aircraft Inc. and combination of Nanjing aerospace university began ultrasonic of wainscot of whole of C919 plane wing gush bolus figuration and research of test and verify of school form craft, exceed in 3~22mm undertake figuration of ultrasonic gush bolus and school form experiment on duralumin board, achieved satisfactory result, formed file of the company's applicable standard of craft of ultrasonic gush bolus. The amplitude of figuration of ultrasonic gush bolus, if the choice is undeserved,enclothe the craft parameter such as rate and gush bolus time, meet those who cause quality of surface of gush bolus workpiece become poor, excessive meeting causes gush bolus the fall of fatigue life, accordingly, need to undertake operation and choice craft parameter according to craft standard file. Crucial technology analyses figuration of supersonic gush bolus and school form technology to have very large development latent capacity, compare with photograph of foreign developed country, at present immanent equipment and relevant engineering technology study the country the respect just all started, need begins the research work of figuration of ultrasonic gush bolus and technology of school form key as soon as possible. (1) the optimization problem of efficiency of supersonic gush bolus. Process of ultrasonic gush bolus is complex, involve mechanistic, acoustics, vibration to learn, a lot of course such as electricity, want to gain efficiency of optimal gush bolus, should consider each gush bolus parameter integratedly to be opposite the influence of gush bolus efficiency. If ultrasonic generator frequency reachs working skill,diameter of rate, firing pin and amount, firing pin distributings time of bolus of amplitude of density, firing pin, gush, balanced set each gush bolus parameter, gaining efficiency of optimal gush bolus is a big question that deserves research of domestic and international scholar. (2) parameter of ultrasonic gush bolus and board makings figuration are measured / the effective control of the mensurable relation between corrective quantity and leftover stress field. Figuration quantity and corrective quantity are to evaluate the target with figuration of ultrasonic gush bolus and school form the most immediate effect, and plasticity deflection is decided by leftover stress field. Accordingly, need passes theoretical calculation, test research, test and finite the size that the method such as yuan of imitate builds parameter of ultrasonic gush bolus and leftover stress field and the corresponding relation that distributing, go further build leftover stress field and capacity of board makings figuration / the computational model of corrective quantity, of field of three-dimensional and leftover stress obtaining is the key problem that deserves research. (3) use finite of yuan of model when analytic software undertakes numeric imitate to process of supersonic gush bolus build accurately. Because gush bolus process is a certain quantity of firing pin,pound workpiece surface with time, workpiece surface gets of each firing pin dynamic action, the concussion direction that is the same as an each firing pin on tool head and wallop size differ likely, and these elements can differ level land affects appearance of workpiece surface form and mechanical performance, whole physics process is very so complex, build accurate workpiece very hard to get gush model. In addition, firing pin and material lead the material attribute below to be given very hard in tall meet an emergency, contact and attrition condition also hard accurate description, make what establish procedure of supersonic gush bolus accurately finite yuan of model is very difficult, the influence arrives finite yuan of simulative accuracy. (4) of figuration of ultrasonic gush bolus and method of program of school form technology and criterion build. Experiment through many foundation, gush bolus parameter is opposite research establish ultrasonic the influence of figuration and rule of school deformation form, be out of shape to differring diagnostic spare parts has the experiment of figuration and school form and test, gush bolus parameter is opposite analytic ultrasonic the influence of precision of quality of configuration of this area streamline, surface, figuration, leftover internal stress, fatigue life, the extraction that gets parameter of ultrasonic gush bolus is worth limits and applicable circumstance, form thereby complex be out of shape the design method of gush bolus figuration and school form craft reachs metallic panel ultrasonic of the feature criterion. Sum up and look into (1) figuration of ultrasonic gush bolus and school form are a kind of new-style green new technology of efficient gush bolus, abounded the plasticity figuration of board makings and school form technology, with traditional machinery figuration and photograph of school form technology are compared, its actuator realizes ability of body of school of automation control, board makings and limits deftly, easily quality of big, surface is good, wide applied perspective is had in aerospace domain. (2) figuration of supersonic gush bolus and school form technology can be used at solving at present the plane makes the wing of big ply, complex curved surface in building rectify body wainscot figuration of local gush bolus and be out of shape corrective problem, improve the production precision of plane wing wainscot and manufacturing efficiency significantly, reduce manufacturing cost. (3) union is present the research current situation of figuration of ultrasonic gush bolus and school form technology, technology of ultrasonic gush bolus should popularize a project to apply actually, still need to study figuration of ultrasonic gush bolus and school form craft carry out the research of figuration and school form effect to material deep, strengthen complex to large size, big ply be out of shape the application of the spare parts is explored, begin prestressing force ultrasonic gush bolus board makings figuration and school form technology. Rise complex figuration of board makings metabolic and school body ability and precision. Through be opposite the development of figuration of ultrasonic gush bolus and theory of school form technology and application studies, this new technology is sure to have wide applied perspective. CNC Milling CNC Machining