35results about How to "Improve plastic fluidity" patented technology

The invention provides an agitating friction spot welding device for dissimilar metal. The device comprises an agitating sleeve, an agitating needle arranged in the agitating sleeve, a clamping sleeve clamped outside the agitating sleeve, and a welding cushion block; a welding workpiece is arranged between the clamping sleeve and the welding cushion pad; an annular electric brush is arranged at the top of the welding cushion block; a T-shaped through hole is formed in the center of the welding cushion block; a conductive rod is arranged in the welding cushion block; the conductive rod is flush with the upper surface of the welding cushion block; and the annular electric brush and the conductive rod are respectively connected with an anode and a cathode of a controllable direct current power supply through a lead. The invention further provides an agitating friction spot welding method for dissimilar metal. The method comprises the following steps of plastically softening metal material, respectively connecting the annular electric brush and the conductive rod with a direct current power supply which has the reversed polarity, so as to conduct a welding loop, and then finishing the welding by adopting a spot welding process. According to the device and the method provided by the invention, as certain welding current is applied to the welding material which is high in lower layer strength during the agitating friction spot welding process of the dissimilar metal, the material is more easily and plastically distorted, the welding pressure is reduced and the welding quality is improved.

The invention discloses an internal high-pressure forming device and a forming method for a micro-metallic T-shaped pipe, and relates to the technical field of metal pipe fitting processing. The forming equipment includes a forming die, two shaft end feed punches arranged in a straight line and a forming end balance punch used to limit the forming height of the T-shaped tube. The forming die includes an upper die and a lower die, and the upper die and the lower die are upper Both are equipped with a T-shaped cavity, and each shaft-end feeding punch is connected to a shaft-end feeding power device, and the forming-end balance punch is perpendicular to the two shaft-end feeding punches, and is connected to the forming-end balance power device Connection, one of the two shaft end feed punches is provided with a gas channel, the gas channel is connected to the high pressure gas supply device, and the bottom of the upper die and the top of the lower die are equipped with heating devices. The invention has the advantages of convenient operation and high safety performance, and can realize air pressure internal high-pressure forming of micrometallic T-shaped tubes under high temperature conditions, reduces requirements on forming pressure and equipment performance, and saves manufacturing costs.

The invention belongs to the technical field of welding, and particularly relates to an ultrasonic coaxial assisted dual-shaft-shoulder friction stir welding method. The ultrasonic coaxial assisted dual-shaft-shoulder friction stir welding method comprises the following steps: (1) placing a to-be-welded workpiece on a welding platform in a butt-joint form, and clamping and fixing a workpiece; (2)regulating a stirring needle of a dual-shaft-shoulder friction stir welding head to align to the butt-joint position of the workpiece, regulating an ultrasonic tool bit and a lower shaft shoulder to be on coaxial positions, and enabling the ultrasonic tool bit and the lower shaft shoulder to be in a pressing state in a welding process; (3) firstly starting the dual-shaft-shoulder friction stir welding head, then, starting the ultrasonic generator, and enabling the dual-shaft-shoulder friction stir welding head and the ultrasonic generator to synchronously move relative to the workpiece to forma friction stir welding seam to realize welding while the stirring needle and the ultrasonic tool bit are in a stable coupling state. A way of applying coaxial ultrasonic vibrations to the bottom ofthe lower shaft shoulder of the dual-shaft-shoulder friction stir welding head is adopted, so that the method increases an ultrasonic energy utilization rate and guarantees quality of a welded joint.

The invention discloses a precise thermal machining method for an engine piston connecting rod, and belongs to the technical field of metal material plastic machining. The method comprises the following steps that S101, a round blank is heated; S102, a precise pre-forming combination process is adopted, wherein a local upsetting process is adopted at first, a box-type variable-cross-section hole type transverse rolling forming process is adopted secondly, and thirdly, flattening and forming is carried out on the rolled blanks in a flattening mode so as to obtain a precisely-blocked extruded blank; and S103, reunion blocking and precise extrusion forming are carried out. According to the precise thermal machining method, the precise pre-forming combination process is adopted, and the process comprises the local upsetting process, the box-type variable-cross-section hole type transverse rolling forming process and a flattening and blocking precision extrusion forming process, so that precise hot working forming of the engine piston connecting rod is realized, the strength and the rigidity of the engine piston connecting rod meet the use requirements, wherein the sizes of a small head, the size of a rod body and the size of a large head of the engine piston connecting rod are close to the size of a finished product, the utilization rate of the material reaches more than 98%, and compared with an existing open type die forging, the material utilization rate is remarkably improved.

The present invention discloses a laser compounding and forming method for bending, which includes steps below: 1) Simulating processing is carried out to billets through a computer platform and partial area hard to be formed is prejudged; 2) Laser processing parameters are obtained according to step 1); 3) Lasers are controlled to realize composite processing through a computer control system according to parameters in step 2) during mechanical processing; 4) Synchronous with the processing in step 3), a sensor for billet state measuring feeds stress, strain and other real-time monitoring data back the control system; 5) As for a fine adjustment scheme, a fine adjustment scheme is firstly confirmed according to step 1), 2), 3) and 4) and then the scheme is controlled by a computer to complete processing. The present invention applies lasers to achieve laser compounding and forming for bending during large-sized piece forming of traditional machinery, well processes parts hard to be reshaped during mechanical forming, thus eliminating possible formed piece flaw and even damages due to mechanical forming.

The invention discloses a method for forming a gas generator gland of an air bag, which comprises the steps of pre-heating an aluminum alloy blank to 160 DEG C-190 DEG C, dipping in sticky lubricant, drying and heating the aluminum alloy blank to 440DEG C-460DEG C, keeping the temperature, and putting in a forging die for press forming. In the forming process, the outer ring of the workpiece bears additional external force in a direction opposite to the plastic flow direction of the workpiece. The additional external force is applied by a hydraulic or pneumatic or spring mechanism through controlling a gliding block on the bottom of a die cavity. The method is applied to processing the gas generator gland of the air bag, improves product precision and production efficiency, prolongs the service life of dies, reduces production cost, and is particularly suitable for automatic production on a large scale.

The invention relates to an auxiliary incremental forming device heating a metal plate by using electrical discharges. The auxiliary incremental forming device is characterized in that a workpiece isfixed on a support, and the support is fixed on a machine tool. During forming machining of the metal plate, a vibrator drives an electrical discharge anode to vibrate together, then the electrical discharge anode is in contact with the plate frequently and alternately, the high-strength electrical discharges are generated, then the plate is locally heated, so that machining conditions are greatlyimproved, and the auxiliary incremental forming device is especially used for a thick plate; and the auxiliary incremental forming device has the advantages that the structure is simple, the work isreliable, the installation operation and the maintenance are convenient.

The invention provides an ultrasonic friction stir welding composite welding system. The system is characterized in that the ultrasonic friction stir welding composite welding system comprises at least one front-stage ultrasonic amplitude-change pole, a rear-stage ultrasonic amplitude-change pole and a stirring head, and at least one ultrasonic transducer is fixed to the front end of each front-stage ultrasonic amplitude-change pole; the front end of the rear-stage ultrasonic amplitude-change pole is fixedly connected with the rear ends of all the front-stage ultrasonic amplitude-change poles; the stirring head is fixedly connected with the rear end of the rear-stage ultrasonic amplitude-change pole; the front-stage ultrasonic amplitude-change poles are high-order polynomial type half-wavelength ultrasonic amplitude-change poles, and the amplification factor of the front-stage ultrasonic amplitude-change poles is a large amplification factor; and the rear-stage ultrasonic amplitude-change pole is a half-wavelength ultrasonic amplitude-change pole, and the amplification factor of the rear-stage ultrasonic amplitude-change pole is a small amplification factor. According to the system, a high-power multi-vibrator ultrasonic vibration system is used for increasing the driving power of the system, improving the ultrasonic energy density in the welding process and improving the welding efficiency, and the high-power ultrasonic vibration system achieves the effects of increasing the ultrasonic amplitude and enhancing the anti-load capacity of the system by designing a multi-stage amplitude-change pole.

The invention discloses a friction riveting device for a thermoplastic carbon fiber composite material and an aluminum alloy. The friction riveting device comprises a female die, a blank holder and a driving rod. The lower part of the female die is of a solid cylindrical structure, the center of the upper part of the female die is provided with a circular groove, and the bottom face of the circular groove protrudes upwards to form a conical shape. The blank holder is of a cylindrical structure, a cylindrical center hole is formed in the center of the blank holder, and the blank holder is arranged above the female die and is coaxial with the female die. The driving rod is coaxially arranged in the center hole and can perform rotary motion and axial feeding motion along the center hole. The invention further discloses a riveting method of the friction riveting device for the thermoplastic carbon fiber composite material and the aluminum alloy, heat is generated through rotating friction, meanwhile, the rotating speed and the axial feeding speed of the rivet are adjusted, and therefore the optimal rivet welding state value between the thermoplastic carbon fiber composite material plate and the aluminum alloy plate can be achieved, and the joint strength and the joint forming effect are improved.

The invention discloses a magnetic surrounding type double-shaft-shoulder friction stir welding tool and a mounting method thereof, and relates to the technical field of friction stir welding tools. The magnetic surrounding type double-shaft-shoulder friction stir welding tool comprises a stirring head; a surrounding type magnetic field device is sleeved with the stirring head; a magnetic line guiding device is installed at the bottom of the surrounding type magnetic field device; a water cooling device is arranged in the surrounding type magnetic field device; and magnetic field enhancing devices are fixedly arranged at the upper end and the lower end of the stirring head. Under the condition that the welding speed and the rotating speed are fixed, the surrounding type magnetic field device, the magnetic line guiding device and the magnetic field enhancing devices are additionally arranged, so that the size of a weld nugget area can be increased, and the metal flowability at the bottom of a weldment is improved so as to make up the defect of dispersively distributed cavities when a cavity behind the stirring needle is filled. The process is simple, the cost is low, the welding efficiency is high, the service life of the stirring head is long, weld structure grains can be refined, and the comprehensive performance is remarkably improved. The process is simple, the cost is low, the welding efficiency is high, the service life of the stirring head is long, weld structure grains can be refined, and the comprehensive performance is remarkably improved.