57 results about "Ultrasonic impact treatment" patented technology

A method for improving the performance of sections of rails joined together by welding by reworking welded joints utilizing an ultrasonic impact treatment (UIT) process either before welding, during welding, after welding or during repairs of used rails, including treatment of a joint, around a joint and / or length of a rail, in order to increasing fatigue life and / or other properties of welded rail sections is disclosed. The method provides reduction of stress defects and redistribution of internal stress patterns in the vicinity of weld seams of rails. The UIT provides periodic pulse energy impact treatment with surfaces in welded rails to induce internal compression waves inducing a metal plasticity state in the vicinity of the weld seam of the rail or in the rail itself.

Devices including a magnetostrictive transducer, an oscillating system and a tool for ultrasonic impact treatment of constructions, construction units and components of machines and mechanisms are disclosed. The invention provides high reliability of magnetostrictive transducers, oscillating systems and their components, tools and their parts affected by simultaneous action of static, dynamic and impact load on a work surface, high stability of characteristics and interchangeability thereof under conditions of small-scale, full-scale and mass production. The invention also includes design solutions with the use of new methods of the realization and manufacturing technique of the above.

A method of production of a metallic product with a nanocrystallized surface layer comprising subjecting a surface layer of a metallic product to ultrasonic impact treatment by one or more ultrasonic indenters vibrating in a plurality of directions, then subjecting the surface layer subjected to the ultrasonic impact treatment to heat treatment at a low temperature to cause precipitation of nanocrystals.

An impact treatment method for improving fatigue characteristics of a welded joint comprising pressing an impact pin against the surface of a base metal material near a toe of a weld bead and making it move relatively to the weld line direction to apply hammer peening treatment or ultrasonic impact treatment, characterized by using as the impact pin an impact pin having a tip curvature radius of ½ or less of a thickness of the metal material and between 2 to 10 mm and, on a surface of a base metal material up to a range where a distance from the toe of the weld bead to the center of the impact treatment position is within 2.5 times the tip curvature radius of the impact pin and where the impact pin does not contact the weld metal during impact treatment, applying hammer peening or ultrasonic impact treatment so as to cause by the impact pin residual plastic deformation where an impact dent has a groove depth of 0.1 to 2 mm, the tip curvature radius of the impact pin or less, and 1 / 10th or less of the thickness of the metal material and where the impact dent has a width of 1.5 to 15 mm and five times or more the groove depth.

The invention relates to an ultrasonic impacting processing technique for resisting stress corrosion cracking, comprising steps of cleaning the surface of a workpiece to be processed to remove all the dust, scales and coating; aligning an ultrasonic impacting gun to the area to be processed including a welding line and heat-affected zones at the two sides of the welding line, wherein the width of the heat-affected zones is 2 to 3 times that of the welding line; converting electrical energy into mechanical energy by a transducer, wherein ultrasonic impacting frequency is 20kHz, leading the ultrasonic impacting gun vertical to the surface of the workpiece to be processed, using a pinhead to impact a determined welding line processing zone at a high speed, wherein coverage percentage of the impact is over 50%; using an X-ray diffractometer to detect the surface of the workpiece, wherein residual stress on the surface of the welded workpiece is compressive stress the value of which is far less than a threshold value causing stress corrosion cracking of the workpiece, and a solidified layer with certain thickness is formed on the surface of the workpiece, thus the processing is finished.

The invention provides a method for improving the strength of a cold-worked part by ultrasonic impact treatment. By implementing ultrasonic impact treatment on the surface of the stretched side of the metal cold-bending process, the surface hardness can be made higher than that of the surface without ultrasonic impact treatment. The surface hardness is increased by more than 10%, and the tensile residual stress can be reduced, and the fracture toughness and fatigue strength can be improved.

The invention discloses a method for repairing defects in a production process of a large-area large-thickness TU2 copper / steel explosion composite material. The method comprises the steps of groove designing and machining, transition layer bead weld, integral heating, gradient heat preservation, coating bead weld and ultrasonic treatment. The method has the advantages that through the integral heating technology, the gradient heat preservation, and the ultrasonic impact treatment, the repairing difficulty of large-plate-width large-thickness coating copper steel composite plates is solved; and the technology and the operation flow are simple, and the method has higher economic practicality.

The invention provides a method for estimating the depth of a metal additive manufacturing ultrasonic impact treatment action layer, wherein the action layer depth calculation model is shown in the specification; wherein rmax is the depth of an action layer, Upsilon is the Poisson ratio of an additive manufacturing metal part, Rho is the density, E is elasticity modulus, f is the frequency of theultrasonic transducer, A is the amplitude of the amplitude-change pole, r0 is the radius of the impact needle; pin is the impact needle, AM is the impacted material, and sigma p0.2 is the compressiveyield strength of the impacted material under the condition of high strain rate. The estimation method disclosed by the invention can be used for predicting the depth of the action layer under specific'additive 'and'forging' forming parameters; the method is used for guiding formulation of an ultrasonic-assisted additive manufacturing composite manufacturing forming process. Accurate control overthe structure and the internal stress of the additive manufacturing metal part is achieved, the problems of shape control and controllability of a formed metal component in the existing additive manufacturing technology are solved, and the high-performance metal part which is comparable to the performance of a forge piece is obtained.

An ultrasonic impact treatment method for remediating metal sensitization including introducing ultrasound compression wave energy through ultrasonic mechanical impulse impacts into an area of sensitized metal in a workpiece. The ultrasound compression wave energy and impulse impacts impart compressive residual stress to the workpiece thereby decreasing tensile stresses in the sensitized metal and modifying the grain structure of the workpiece. These changes to the structure of the workpiece combine to slow the rate of enrichment of alloying elements at grain boundaries within the area of sensitized metal, cause intergranular diffusion of alloying elements in the area of sensitized metal, return a portion of alloying elements in the area of sensitized metal to solution and reduce or eliminate substantially straight intergranular paths through the workpiece.

The invention relates to the technical field of 3D printing, in particular to a welding additive trailing ultrasonic impact device and an operation method. The welding additive trailing ultrasonic impact device comprises a welding gun, a connecting sleeve assembly and an ultrasonic vibrator, the welding gun is connected with the connecting sleeve assembly through a welding gun connecting assembly,the ultrasonic vibrator is sleeved with the connecting sleeve assembly, a steel ball at the bottom end of the ultrasonic vibrator penetrates through the connecting sleeve assembly and then makes contact with a weld layer for trailing ultrasonic impact treatment on the weld layer. According to the welding additive trailing ultrasonic impact device and the operation method, damage energy of seismicwaves to a building can be converted, the influence of the seismic waves on a building foundation is blocked, and then vibration of the overground part of the building is avoided; ultrasonic impact real-time impact is carried out on the weld layer or a weld seam, and the modern welding additive manufacturing requirement can be met; the requirements of different impact pressures and unevenness ofweld pieces can be met; the distance between an ultrasonic impact position and a welding gun position can be adjusted according to requirements to adapt to adjustment of trailing time lag time; and the ultrasonic transmission efficiency is high, and the ultrasonic impact treatment effect is good.

The invention discloses a layered ultrasonic impact treatment method capable of optimizing the structure and the performance of a weld. The layered ultrasonic impact treatment method comprises the following steps: completing preparations before welding at first, wherein a base material in a groove of the weld with ethyl alcohol is cleaned, adherent greasy dirt caused by machining is removed, and then the cleaned base material is dried by an air blower; welding the first layer of welding bead, and removing welding slag by using a steel wire brush after the first layer of welding bead is welded; when the first layer of welding bead is cooled to range between 500 DEG C or below and the room temperature, performing ultrasonic impact on the first layer of welding bead by using ultrasonic impact equipment; after the ultrasonic impact on the first layer of welding bead is finished, removing slag inclusion caused by the ultrasonic impact process by using the steel wire brush; and then repeating the above steps until the whole weld is welded. According to the layered ultrasonic impact treatment method disclosed by the invention, the weld is subjected to layered ultrasonic impact in a multi-layer multi-welding-bead welding process, so that the internal mechanical properties of the weld can be optimized.

The invention belongs to the field of process technology, and relates to an ultrasonic impact treatment process for reducing residual stress of an aluminium alloy box girder welded structure. The process includes the specific steps of impact head selection which is carried out by selecting an impact head according to the thickness of an aluminium alloy plate or the height of a weld corner, and selecting a single-row or a double-row impact head according to the position of a welded seam; ultrasonic impact treatment process parameter optimization which is carried out by optimizing the impact treatment process according to the thickness of the aluminium alloy plate and the height of the welded corner; the aluminium alloy box girder welded structure impact treatment which is carried out by adopting an optimized ultrasonic impact treatment process to the welded seam of the aluminium alloy box girder welded structure; and effect evaluation which is carried out by verifying the reduction effect of the ultrasonic impact treatment process to the welding residual stress. The advantages of the treatment process are that the treatment process can be repeatedly used without limit while maintaining a good precision; the treatment process can carry out a treatment on a welded seam pertinently and selectively; and the treatment process has a remarkable effect on eliminating the welding residual stress, more than 60% of the welding residual stress can be eliminated.

The invention discloses an ultrasonic impact device. The device comprises an ultrasonic impact gun, a spring pre-pressing sliding table and a titanium alloy test piece, wherein the titanium alloy testpiece is a titanium alloy part which is subjected to electric spark modification treatment, and provided with an amorphous alloy coating layer; the ultrasonic impact gun is fixed on the spring pre-pressing sliding table, the spring pre-pressing sliding table comprises a compression spring, and the pre-pressure of the ultrasonic impact gun can be accurately controlled by controlling the compression amount of the compression spring through the spring pre-pressing sliding table; and residual stress of the electric spark modified layer can be removed by conducting an ultrasonic impact treatment on the amorphous alloy coating of the titanium alloy test piece according to the pre-pressure by the ultrasonic impact gun, and compressive stress is applied, so that the high-cycle fatigue performanceof the titanium alloy test piece due to the electric spark modification is improved.

The invention belongs to the field of material-adding manufacturing, in particular to an analysis method of the influence of ultrasonic shock treatment on residual stress of a metal component formed by laser selective melting. Firstly, the finite element software Simufact.Additive is used to simulate the laser selective melting forming process of aluminum alloy sheet, and cooled in Simufact.Forming, the distribution of manufacturing residual stress and deformation is obtained, Then, based on the residual stresses and deformations produced in the laser selective melting process, the ultrasonicimpact process is simulated by using the input stress and deformation mesh of Msc. Marc, so as to analyze the physical process of the whole ultrasonic impact on the metal components formed by laser selective melting. The method utilizes Msc. Marc power transient module to carry out ultrasonic impact simulation, the stress field of laser selective melting forming is taken as the initial condition,the calculated results are in good agreement with the measured results of residual stress tester in the numerical value and variation trend, and the purpose of optimizing the impact process parametersand exploring its mechanism is achieved.

The invention discloses an explosion valve tension bolt weakening groove surface ultrasonic impact treatment device and a working method thereof, and belongs to an axis part circumferential groove surface strengthening device and method. According to the explosion valve tension bolt weakening groove surface ultrasonic impact treatment device and the working method thereof, the ultrasonic impact amplitude is adjusted to be 20-30 [mu]m, a tension bolt is driven to rotate by a rotating driving mechanism, and thus the rotating linear velocity of the hyperboloid of an impacted weakening groove is 0.8-1.2 mm / s; and a power supply is turned on, the tension bolt weakening groove is subjected to impact treatment, and the suitable impact strength is 10-15 s / mm by the impact time per unit length. A lot of practice proves that the treated tension bolt weakening groove is smooth and clean in surface and remains unchanged in shape; the surface hardness and residual stress of the bottom surface of the weakening groove in the circumferential direction of the tension bolt are uniform and consistent, so that uniform and consistent surface strengthening of the surface of the weakening groove is achieved; fully-automated operation is achieved, the efficiency is high, and technological repeatability is good; a plastic deformation layer with the thickness greater than 1 mm and difficult to achieve through other strengthening method can be obtained; the clean and environmental protection effects in the processing process are achieved, and workpieces are not polluted; and the technology is simple,parameters are less, and monitoring and adjusting are easy.

The invention relates to an ultrasonic impact treatment method for reducing the residual stress of a titanium alloy thin plate welded structure, belonging to the technical field of metal processing. The ultrasonic impact treatment method specifically comprises the following steps: (1) selecting an impact head: carrying out ultrasonic impact treatment on the titanium alloy thin plate welded structure, wherein the shape of the selected impact head is closely relevant with the shape of a welding joint according to a titanium alloy thin plate welding method, the width of a weld joint of the impacthead is narrow during vacuum electron beam welding, a tabular impact head is adopted, and the width of the impact head is 1.5mm-2.5mm; and (2) carrying out ultrasonic impact treatment process, wherein the impact manner is weld toe impact, the impact number of times is 2-4, the impact speed is 150mm / min-300mm / min. According to the ultrasonic impact treatment method, the targeted and selective treatment of the weld joint can be realized; and the welding residual stress can be obviously eliminated by virtue of the treatment process, and the beneficial pressure stress can be further introduced.

The present invention is to provide automobile wheels, pulleys, gears, track pulleys, etc., which have structures such as lap fillet joints, cold-formed parts, and punched holes that are subject to alternating loads due to rotation. The invention of the life-span rotating body, the long-life rotating body with excellent fatigue strength and its manufacturing method according to the present invention, the rotating body refers to a lap fillet weld joint formed by overlapping two metal plates and then welding the ends, For rotating bodies such as cold-formed parts and punched holes, ultrasonic shock treatment is applied to any part of them to form indentations or smooth the surface to relieve tensile residual stress.

A method for forming a smooth interface between a weld cap and an adjacent base metal utilizing ultrasonic impact treatment. The method improves the geometric profile of a weld while imparting a compressive residual stress layer on the weld metal and base metal thereby alleviating the tensile residual stresses imparted to the metals during welding. The contouring process does not remove material, as in grinding, but plastically deforms the surface being treated producing a densified surface, in turn providing a smooth weld cap and base metal surface finish without the loss of base or weld metal thickness.

The invention discloses a cyclical ultrasonic impact process for maintaining a welding joint. According to the process, in the process of using a magnesium alloy welding structure, cyclical ultrasonic impact treatment is performed on the welding joint, so as to recover surface quality and performance reduction in the welding joint manufacturing and using process caused by process, load and environment factors and the like and part of microdefects in recovery use, and thus the service life is prolonged.

The invention belongs to the field of car crash and belongs to a car crash box residual stress elimination method. The method comprises the steps of conducting vibration ageing treatment, conducting heat ageing treatment on a crash box and conducting ultrasonic impact treatment on the surface of the crash box. Through combination of vibration ageing, heat ageing and ultrasonic impact and engineering practice and testing, the residual stress elimination rate of the crash box can reach 90% or above. The surface of the crash box is reinforced, and the energy absorption effect is substantially improved. Meanwhile, the method is applicable to residual stress elimination of other metal thin-walled structure and has high universality.

The invention discloses a method for improving the grain size of additive manufacturing. The method comprises the following steps of carrying out ultrasonic vibration in a CMT additive manufacturing process, and carrying out ultrasonic impact treatment on the surface of a formed component, so that plastic deformation is generated on the surface of the component, and grains of the surface layer ofthe component are refined. According to the method for improving the grain size of the additive manufacturing, the composite additive manufacturing of CMT and the ultrasonic vibration is adopted, theultrasonic impact treatment is carried out after manufacturing, so that the grain size of the component is reduced, and then the density and the mechanical property of the component obtained through the additive manufacturing are improved.

The invention discloses a treatment method for improving the fatigue life of welded parts, which relates to the technical field of welded parts, including: (1) preheating treatment; (2) first ultrasonic impact treatment; (3) irradiation treatment; (4) The second ultrasonic impact treatment; (5) high current treatment; a treatment method for improving the fatigue life of the weldment provided by the present invention can not only significantly eliminate the residual stress of the weldment, but also significantly improve the fatigue resistance of the weldment performance.

A method of production of a metallic product with a nanocrystallized surface layer comprising subjecting a surface layer of a metallic product to ultrasonic impact treatment by one or more ultrasonic indenters vibrating in a plurality of directions, then subjecting the surface layer subjected to the ultrasonic impact treatment to heat treatment at a low temperature to cause precipitation of nanocrystals.

The invention discloses a surface compound treatment process of an austenitic stainless steel welded joint. The surface composite treatment process comprises the following steps that a, firstly, an impact gun is used for carrying out ultrasonic impact treatment on the heat affected zone and the welding seam zone of the joint by adopting a needle type impact head; b, next, the impact gun is used for carrying out ultrasonic impact treatment on the welding seam zone and the welding toe zone by adopting a cylindrical impact rolling pin; c, then, the impact gun is used for carrying out impact treatment on the heat affected zone, the welding seam zone and the welding toe zone again under the low-power condition by adopting the needle type impact head; d, when the roughness is larger than 128 microns or the hardness is smaller than the hardness of a base material by 1.5 times, the step c is repeated; and e, the treated welding seam zone, the treated welding zone and the treated heat affectedzone are coated by adopting a strong acid with a certain concentration. According to the surface compound treatment process of the austenitic stainless steel welded joint, the mode is adopted, so thatthe stress corrosion resistance of the austenitic stainless steel welded joint is improved, and especially the anti-fluorine ion stress corrosion resistance of the austenitic stainless steel welded joint is improved.

A method for forming a smooth interface between a weld cap and an adjacent base metal utilizing ultrasonic impact treatment. The method improves the geometric profile of a weld while imparting a compressive residual stress layer on the weld metal and base metal thereby alleviating the tensile residual stresses imparted to the metals during welding. The contouring process does not remove material, as in grinding, but plastically deforms the surface being treated producing a densified surface, in turn providing a smooth weld cap and base metal surface finish without the loss of base or weld metal thickness.

The invention discloses a method for reducing air holes of an aluminum alloy cold metal transfer (CMT) welding joint. The method comprises the following steps that ultrasonic impact treatment is carried out on the welding joint; in the ultrasonic impact process, an impact needle always follows the normal direction of a welding seam to ensure that the surface of the welding seam and a welding toe are completely impacted; and due to plastic deformation on the surface of the joint after the ultrasonic impact treatment, the air holes, within 1 mm adjacent to the surface of the welding seam, insidethe joint are squeezed, so that the size of the air holes is reduced or the air holes are eliminated, the number and size of the air holes of the aluminum CMT welding joint are effectively improved,and therefore the compactness and hardness of the joint are improved.