11results about How to "Reduce flow stress" patented technology

The invention discloses an additive component and a friction stir deposition additive manufacturing device and method.The additive component is provided with an axial direction and a feeding channel, the feeding channel penetrates through the additive component in the axial direction, a shaft shoulder side facing a base plate is formed at the end, located in the axial direction, of the additive component, and a material storage cavity is formed in the additive component; the material storage cavity is arranged around the feeding channel in the circumferential direction, communicates with the feeding channel and is adjacent to the shaft shoulder side. The material storage cavity is formed in the material adding component, high-value instantaneous shear strain is generated through friction between the rotating bar and the inner wall of the material storage cavity, and more friction and deformation heat are generated, so that the material can be thermally plasticized in the material storage cavity in advance before deposition, the flow stress of the material is reduced, and the fluidity of the material is improved; the hard high-strength material can be applied to friction stir deposition additive manufacturing, the application range of the material is expanded, metallurgical bonding of a deposition layer interface is enhanced, and component forming is optimized.

The present invention discloses an electrically assisted preparation method for a space-bending thin-walled structural part with continuous large-area array micro-grooves of a difficult-to-deform material, and specifically relates to a micro-groove roll forming method for difficult-to-deform materials such as titanium alloy, high-strength aluminum alloy, and high-temperature alloy foil. The method comprises the following steps: passing a pulse current with variable electrical parameters into the difficult-to-deform metal foil, giving a micro-groove forming depth h, and maintaining the spatial difference distribution T of the temperature field on the surface of the sample through a temperature feedback adjustment system and a heat dissipation unit auxiliary means. 0 、T 1 ,…T i …T n‑1 、T n , so that the radius of curvature of the micro-grooves on the foil surface after rebound is differentially distributed along the width direction, and the motor-driven continuous rolling forming can obtain a spatially curved thin-walled structural part with a continuous large-area array of micro-grooves.

This invention discloses a corrosion-resistant free-machining brass alloy, its preparation method, and its applications. The corrosion-resistant free-machining brass alloy is composed of the following components by mass percentage: Cu: 58.0~62.5%, Si: 0.3~1.2%, Ni: 0.1~0.5%, Mn: 0.3~0.7%, B: 0.005~0.025%, with the balance being Zn and unavoidable impurity elements, wherein the total content of unavoidable impurity elements is <0.3%. The brass alloy of this invention possesses excellent machinability, corrosion resistance, and mechanical properties, and is lead-free, meeting environmental protection requirements and satisfying the needs of various fields for brass alloy materials.

The invention relates to a material adding device and method for ultrasonic resonance assisted direct deposition of a high-melting-point metal wire. The device comprises a wire feeding system, a control system, an ultrasonic resonance system, an electromagnetic induction heating device, a three-axis moving device, a substrate preheating device and a shear strain transmission device. For a high-melting-point metal wire, a wire feeding system drives the metal wire to be conveyed downwards along a high-temperature wire feeding pipe, an electromagnetic induction heating device at the lower end of the high-temperature wire feeding pipe softens the metal wire, the metal wire and the wire feeding pipe penetrate through a shear strain transmission device together, and a hollow connecting rod loaded with piezoelectric ceramics transmits ultrasonic vibration to the metal wire; the metal wire is extruded through a shear strain deposition head, and the ultrasonic resonance auxiliary direct deposition process of the metal wire is completed; the control system can adjust the amplitude and frequency of ultrasonic vibration, the electromagnetic induction heating temperature, the wire feeding speed, the substrate preheating temperature and the working frequency of the shear strain device according to actual conditions. According to the device, direct deposition of the high-melting-point metal wire is achieved through electromagnetic induction heating, high-frequency ultrasonic vibration can greatly reduce the flow stress of the material, a large number of dislocations are generated, atomic diffusion is promoted, and metallurgical bonding of adjacent metal units is achieved.

The present invention provides an additive manufacturing device based on resonance-assisted deposition, comprising a deposition mechanism, a vibration mechanism, an additive mechanism, a rotation mechanism, and a three-axis motion system. The device utilizes two major mechanisms, namely, ultrasonic softening and solid-state diffusion connection, to achieve efficient and reliable additive manufacturing, and adopts a unique resonant vibration mode. The waveguide cone is vibrated at the natural frequency of the metal wire through an ultrasonic device, so that the two resonate, thereby improving the mobility and surface diffusion rate of the deposited particles, and achieving more accurate energy input and plastic flow control. In addition, a unique metal wire processing method is adopted to change the cross-sectional shape of the metal wire from a circle to a rectangle, and at the same time, the connection between unit molded bodies is achieved. Compared with other existing similar devices, the device of the present invention comprehensively surpasses similar devices in terms of energy efficiency, precision, and forming quality.

The invention relates to a semi-solid alloying method for preparing a metal alloy material. The method comprises the following steps: firstly, obtaining a solid-liquid coexistence temperature interval suitable for treatment based on a phase diagram and thermodynamics calculation; then selecting metal raw materials forming the target component, and assembling the metal raw materials into an original blank with a close contact interface; and in the semi-solid temperature interval, a heat-force coupling process is adopted, a solid-liquid coexisting semi-solid structure is formed through local liquefaction induced by diffusion / mass transfer, and macroscopic flow mixing and microstructure reconstruction of the material are enhanced under the shear deformation or stirring effect, so that uniform alloying and structure refinement of the target alloy material are achieved. Compared with the prior art, the method has the advantages that uniform alloying and structure refinement of the alloy material can be realized under the condition that the traditional multi-step series connection of smelting, casting, heat treatment, deformation processing and the like is not needed, the alloy material with uniform components, fine matrix structure and uniformly distributed second phase is obtained, the process flow is simplified, and the energy consumption is low.

This invention relates to the field of sheet metal processing equipment, and discloses a multi-source ultrasonic friction stirring processing device, including a fixed outer cylinder, a stationary shoulder, an ultrasonic probe, an amplitude transformer, a transducer, a first ultrasonic generator, a tool holder, a stirring head, an amplitude transformer transducer, a conductive slip ring, a second ultrasonic generator, and a feeding mechanism. The lower end of the fixed outer cylinder is connected to the stationary shoulder. The tool holder is located inside the fixed outer cylinder. The stirring head is connected to the lower end of the tool holder, and the lower end of the stirring head is flush with the lower end of the stationary shoulder. A stirring needle is provided at the lower end of the stirring head. The ultrasonic probe, amplitude transformer, transducer, and first ultrasonic generator are connected sequentially, and the ultrasonic probe is connected to the stationary shoulder. The amplitude transformer transducer is located on the tool holder. The conductive slip ring is sleeved and connected to the outside of the amplitude transformer transducer and is electrically connected to the second ultrasonic generator. The feeding mechanism communicates with the interior of the stationary shoulder. This invention can smoothly promote material softening and flow, reduce material rheological stress, and prevent a significant temperature increase.

The application discloses a TiAl alloy valve blank and a preparation method thereof, and belongs to the technical field of alloy material processing. The TiAl alloy valve blank preparation method comprises the following steps: preparing a TiAl alloy extrusion blank; heating the TiAl alloy extrusion blank and placing the TiAl alloy extrusion blank in a preheated extrusion die for extrusion to obtain an extruded part; and supplementing the temperature of the extruded part and die forging the extruded part to obtain a TiAl alloy valve blank. The application realizes the processing of the TiAl alloy under the condition of no cover, and the valve blank is prepared, and the problem that the TiAl alloy is difficult to form is effectively overcome.

This invention discloses a multi-energy field assisted deep drawing device and method for difficult-to-deform alloys with equivalent draw beads, belonging to the field of sheet metal deep drawing processes. It includes a deep drawing punch, a blank holder slidably fitted around the periphery of the deep drawing punch, and a deep drawing die. The deep drawing punch can be inserted into the deep drawing die. A temperature system is symmetrically arranged around the blank holder and the overlapping portion of the deep drawing die and blank holder. The temperature system includes a ring-shaped heating zone centered on the deep drawing punch, a cooling zone, and a second heating zone. The cooling zone is located between the first and second heating zones. When the billet is deep-drawn, the temperature of the cooling zone is lower than that of the first and second heating zones. Since the yield strength of the material varies at different temperatures, controlling the local cooling temperature increases the radial tensile stress in that section of the material, thereby avoiding circumferential wrinkling and improving forming quality. This method allows for applying different temperatures to different materials to change the radial tensile stress, exhibiting greater adaptability.

This invention relates to the field of semi-solid materials and discloses a semi-solid pulping machine, including a frame, a pulping component and an ejection mechanism below the pulping component on the frame, a vertical channel penetrating the upper and lower sides of the pulping component on the pulping component, and an ejection mechanism including an injection rod with a punch at the top of the injection rod. The punch has a hollow structure and is slidably connected to the vertical channel and can close the lower end of the vertical channel. The top of the punch is perpendicular to the side wall of the vertical channel to produce aluminum material and prevent material from sticking.

The present invention provides a method and device for preparing hydrophobic surface and strengthening forming by laser etching of aluminum alloy assisted by magnetic field force, comprising the following steps: fixing the two ends of the aluminum alloy on a fixture; a planar spiral coil and a laser are located directly above the surface of the aluminum alloy to be processed; the planar spiral coil generates a pulsed magnetic field, and the laser beam is located at the center of the pulsed magnetic field; laser etching is used to form a remelting groove and deposited spatter on the surface of the aluminum alloy to be processed, and the remelting groove and deposited spatter constitute a micro-nano multi-level structure; the pulsed magnetic field induces eddy currents on the surface of the aluminum alloy, and an induced magnetic field is formed by the eddy currents, the magnetic field direction of the induced magnetic field is opposite to the magnetic field direction of the pulsed magnetic field, and the repulsive force of the two magnetic fields causes the surface of the aluminum alloy to be processed to deform; the surface energy of the material is reduced by chemical modification of the processed surface of the aluminum alloy, and a curved aluminum alloy surface with super-hydrophobicity is obtained. The present invention can effectively prepare a curved reinforced aluminum alloy with a super-hydrophobic surface.