550 results about "Metal forming" patented technology

The invention belongs to the technical field of metal forming machining, and provides a variable-curvature thin-wall micro-channel structure manufacturing process which comprises the steps that a channel is machined in the front face of a raw material plate, a bottom plate is obtained, and the channel is provided with an arc-shaped protruding groove bottom; diffusing and welding a cover plate on the front surface of the bottom plate to cover the bottom plate to obtain a first prefabricated plate; the back face of the first prefabricated plate is machined to enable the bottom of the channel to be provided with a groove with the same shape as the groove bottom of the arc-shaped protrusion, and a second prefabricated plate is obtained; and the second prefabricated plate is pressed by the mold to obtain the variable-curvature thin-wall micro-channel structure. The thin-wall micro-channel structure is split into a combined structure of the cover plate and the bottom plate, and the variable-curvature thin-wall micro-channel structure is obtained by pressing and forming the cover plate and the bottom plate through a mold after the cover plate and the bottom plate are combined. According to the variable-curvature thin-wall micro-channel structure, the channel is formed in the bottom plate, arc compensation is conducted on the channel of the bottom plate by arranging the arc-shaped protruding groove bottoms according to the different curvatures of the bottoms of all the micro-channels of the variable-curvature thin-wall micro-channel structure, it can be guaranteed that the wall thicknesses of the bottoms of the micro-channels are consistent, and cracking in the profiling process is avoided.

The invention provides a plate forming control method and device based on deep learning, and relates to the technical field of stamping control, and the method comprises the steps: training an original CNN model through a sample data set, and obtaining an intermediate CNN model; the sample data set comprises plate static data and springback data; the plate static data comprises initial size parameters and material parameters; the rebound data comprises a first displacement field after the pressure head is evacuated and the plate is rebounded under different punching depths; determining displacement field compensation values corresponding to the different stamping depths based on a first displacement field error corresponding to the experimental data and the simulation data before the rebounding of the plate under the different stamping depths and a second displacement field error after the rebounding of the plate; adjusting the parameters of the intermediate CNN model by using the displacement field compensation value until the prediction error of the intermediate CNN model is less than a preset threshold, and obtaining a target CNN model; and the plate static data of the to-be-processed plate and the target forming effect are input into the target CNN model, and the target stamping depth is obtained.

A tailor-welding, spinning and variable-wall-thickness forming method for a large-sized extension section of a liquid propellant rocket engine, which belongs to the technical field of metal forming. The method comprises: performing laser numerical control machining on a GH3044 superalloy to obtain two chord-tangent circles; performing electron beam welding to obtain a complete circle; performing a vacuum solid solution treatment; performing pre-forming to obtain a shallow dish shape; performing a vacuum solid solution treatment; assembling a variable-wall-thickness flat blank and a spinning mandrel of a first spinning die, and then performing spinning on a spinning machine to form a curved generatrix variable-wall-thickness blank part; performing a vacuum solid solution treatment; and assembling the curved generatrix variable-wall-thickness blank part and a spinning mandrel of a second spinning die, and then performing spinning on the spinning machine to form a curved generatrix variable-wall-thickness part. The present invention is mainly used for the manufacturing of an ultra-large-sized GH3044 extension section of the liquid propellant rocket engine, which has a diameter of 1200 mm and a length of 1500 mm, and the product precision reaches a wall thickness tolerance of + / -0.05 mm for each point and a surface profile of ≤3 mm.

The present disclosure discloses a multi-sensor-based hot forming production system for an aluminum alloy sheet metal part and a control method thereof, and belongs to the field of aluminum alloy sheet metal forming manufacturing technology. A plurality of sensors are disposed in the hot forming production system, and closed-loop control of a whole process and adaptive production can be realized based on deformation properties, a microstructure evolution law, and a mechanical property change law of the aluminum alloy sheet metal part. The hot forming production system comprises a control system based on a multi-physical quantity model, an environmental heating furnace, an automated transfer and positioning device, a hot stamping and forming device, and an in-die aging device. By using the hot forming production system and the control method thereof, the product quality and the stability of the forming process can be effectively improved, and the adaptability of the process to form different types of alloys can be enhanced.

The present invention provides a metal molded article, a manufacturing method therefor, and an inspection device having same. The metal molded article has an overall length dimension in a longitudinal direction, an overall thickness dimension in a thickness direction perpendicular to the longitudinal direction, and an overall width dimension in a width direction perpendicular to the longitudinal direction. The metal molded article is divided into a first body region and a second body region in the thickness direction. The lateral surfaces of the first body region are provided with multiple micro-trenches that are grooves formed to be elongated in the thickness direction and arranged side by side all over the entire lateral surfaces of the first body region. The lateral surfaces of the second body region are not provided with these micro-trenches.

To provide a composite structure allowed to facilitate mold release and a method of manufacturing the same.SOLUTION: A composite structure 100 has a bottom plate 1 and a pair of first side plates 3 erected from side edges of the bottom plate 1 and also comprises outer and inner plate materials 10 and 20 formed of metal and a foam 30 formed of a foam material. The outer plate material 10 has an outer bottom-plate portion 11, a first outer side-plate portion 13, an outer surface 10a and an outer opposed surface 10b. The inner plate material 20 has an inner bottom-plate portion 21, a first inner side-plate portion 23, an inner surface 20a and an inner opposed surface 20b. The foam 30 is charged between the outer opposed surface 10b and the inner opposed surface 20b. The outer plate material 10 has an outer rugged portion 16 provided on the outer surface 10a. The inner plate material 20 has an inner rugged portion 26 provided on the inner surface 20a.SELECTED DRAWING: Figure 3

The invention provides a frame flat plate satellite structure based on extrusion and sheet metal forming, and belongs to the field of satellite structure design. According to the satellite structure, modular and standardized design thoughts are adopted for the connecting columns, the cabin body, the frame, the cross beams and the connecting pieces, low-cost and high-efficiency mature forming process means such as extrusion and sheet metal are adopted for components, machining work is greatly reduced, the production cost is effectively reduced, and the production efficiency is improved. According to the satellite structure, splicing and inserting type assembly of products is facilitated through standardized interfaces of parts, flexible adaptability of configuration and load installation is achieved through modular design, and adaptability of the satellite structure to batch and low-cost development is achieved.

The invention discloses a metal laser fuse additive manufacturing device based on microgravity and vacuum conditions, which belongs to the field of metal material additive manufacturing in a space environment and comprises a controller module, a mechanical and motion module, a laser module, a thermal control and monitoring module and a data acquisition module. The mechanical and moving module comprises a device shell internally provided with multiple layers of cavities, a feeding mechanism arranged at the bottom of the lower cavity of the device shell, and a bottom plate moving mechanism. The laser module, the feeding mechanism, the bottom plate movement mechanism, the thermal control and monitoring module and the data acquisition module are all in circuit connection with the controller module; in the working state, an amorphous alloy bar is softened under the laser action of the laser module and is driven by the feeding mechanism to make contact with the bottom plate, the amorphous alloy is further softened along with follow-up heating, and the amorphous alloy is bonded with the bottom plate by adjusting movement of the bottom plate and naturally cooling, so that metal forming is achieved.

The invention belongs to the technical field of aviation aircraft sheet metal part machining, and relates to a manufacturing method of a variable-thickness multi-bent-edge thin-wall part with a reinforcing groove structure. According to the invention, the process method of numerical control milling blanking, sheet metal forming and chemical milling is adopted to replace the process method of numerical control milling and sheet metal forming. Mechanical cutting is replaced by chemical milling, two sets of newly-designed tools are matched for forming the reinforcing groove and the bent edge, the problems that a web is wrinkled and cannot be repaired and a thickness area is distorted and deviated due to forming of the reinforcing groove are solved, the accurate appearance of a part is finally obtained, and the surface quality is improved. The method has generalizability and can be widely applied to machining of complex molded surfaces and variable-thickness thin-wall parts, and the weight of an aircraft body is further reduced while the structural use requirement is met.

A liquid composition for providing enhanced lubrication and wear protection, particularly under high-performance and / or extreme-pressure conditions. The composition comprises components that are either solubilized, liquified, or sub-micronized, and are formulated to result in a stable, color-tunable composition that can be stored or implemented over extended periods of time without separation of solid components from the liquid. A composition can either be a lubricant in which the solubilized, liquified, or sub-micronized components are comprised within a base oil, or an additive composition in which the components are formulated to be later added to a base oil. Suitable base oils are industrial, automotive, or open gear oils such as those used in the oil and gas industry, sugar mills, or in rock crushers; rock drill, pneumatic, and air tool oils; anti-seize compounds; cutting, gun, engine, air compressor, or bearing oils; slideway lubricants; and oven, kiln, foundry, metalworking, metalforming, or aerospace lubricants.

The invention relates to an integrated machining method for a niobium-tungsten alloy composite surface variable-wall-thickness thin-wall part, and belongs to the field of metal plate forming. Determining the size of a niobium-tungsten alloy plate according to the size of the composite surface; groove milling is conducted on the spinning clamping position of the niobium-tungsten alloy plate; the machined plate is arranged on a spinning tire, and a tail top is used for clamping and fixing; the variable wall thickness forming of the curved generatrix part is realized by adopting strong shearing spinning and common spinning deep drawing spinning; the equal-wall-thickness forming of the cylindrical part is realized by adopting multi-pass deep drawing and spinning; the tiny allowance of the outer wall is removed through precise turning cutting, and it is guaranteed that the wall thickness meets the product use requirement; polishing the inner and outer surfaces to reduce the surface roughness; the niobium-tungsten alloy plate is used for forming, the material utilization rate is increased, split connection weld joints are reduced through a highly-integrated forming method, and the structural reliability is improved.

The present invention discloses an intelligent detection method for determining forming defects by the offset of the blank contour of a stamping part, belonging to the field of sheet metal forming quality detection. In the present invention, the offset amounts of the contour feature points of the blank in the defective state and the defect-free state are obtained through finite element simulation of the stamping process. After manually annotating the defect types, a training data set and a validation data set are obtained, and based on this, a BP neural network model is constructed and trained to obtain a defect detection model. At the stamping site, a laser rangefinder is used to measure the offset amount of the actual stamping blank contour feature points along the material inflow direction, and the offset amount is input into the BP neural network defect detection model to output the defect judgment result. The method of the present invention greatly alleviates the current manual dependence on stamping forming quality detection and has the advantages of high detection efficiency, high accuracy, and low cost.

The invention belongs to the technical field of aviation aircraft sheet metal part machining, and relates to a manufacturing method of a T-shaped section variable-thickness stringer part. A material is changed into a T-section profile material, the technological process of numerical control milling-stamping forming-manual forming is used for replacing the technological process of numerical control milling-manual finishing, three sets of newly-designed tools are matched for milling and sheet metal forming, the structure of the milling clamp is simplified, the machining efficiency is improved, and the machining cost is reduced. The milling difficulty and manufacturing cost of the part are reduced, profile distortion, residual stress and the like in the machining process are reduced, the material utilization rate and the product quality are improved, and precise manufacturing and lean manufacturing of the thickness-variable stringer part with the T-shaped section are achieved through the simple technological process combining numerical control milling and sheet metal forming. The method has generalizability and can be widely applied to machining and manufacturing of complex stringer parts.

The invention belongs to the technical field of simulation application, and particularly relates to a metal forming limit curve prediction method based on a neural network, and the method comprises the steps: obtaining a basic performance capable of representing single-pull performance and a forming limit curve of a material; parameterizing the basic performance and the forming limit curve to obtain a strain parameter and a parameterization curve; obtaining a neural network model, and training the neural network model according to the strain parameters and the parameterized curve; and obtaining input parameters of a to-be-predicted material, and predicting a forming limit curve according to the data parameters and based on the trained neural network model. The data used for training the neural network is wide in source and can be obtained through self experiments according to the mode introduced in the patent, and any existing experimental data can also be used. Predicted results can be used for engineering problems including punch forming process analysis, sheet metal failure prediction and the like, and efficiency and accuracy of related simulation of sheet metal forming are improved.

The invention discloses a method for manufacturing an aluminum alloy thin-wall part through hot shape correction of a rubber bag after sheet metal forming. The method comprises the steps that firstly, an aluminum alloy thin-wall part blank is obtained through sheet metal forming; secondly, the blank is subjected to solution treatment; thirdly, the blank obtained after solid solution treatment is put into a refrigerator to be stored; fourthly, the rigid mold, the rubber bag and the like are installed on a press machine, overall heating is conducted, and the temperature is kept stable; fifthly, the blank obtained after solid solution is rapidly placed above a hot-state rigid mold, and positioning of the rigid mold and the blank is completed; 6, quickly closing the die, pumping hydraulic oil into the rubber bag, and increasing the pressure of the press machine to the set pressure; seventhly, the rubber bag extrudes the blank to enable the blank to be tightly attached to the rigid mold, and the mold temperature is transmitted to the blank; 8, under the combined action of high pressure and a thermal field, the aluminum alloy is subjected to aging strengthening and stress relaxation, and springback is reduced; 9, unloading the pressure of the rubber bag and the hydraulic machine; and 10, opening the press machine to take out the blank, and uniformly cooling in a cooling tool to obtain a thin-wall part finished product.

The invention discloses a metal forming punching device with a positioning structure and a using method thereof, and relates to the technical field of punching machines, the metal forming punching device comprises a punching machine body placed on the ground, the telescopic end of an oil cylinder at the top of the punching machine body is fixedly connected with an upper die base, and the bottom of the punching machine body is fixedly connected with a lower die base; a supporting frame is slidably connected to the outer side of the lower die base, and positioning structures are arranged on the two sides of the top of the supporting frame. According to the metal forming stamping device with the positioning structure and the using method of the metal forming stamping device, accurate transverse positioning and one-way stepping feeding of a metal material plate are achieved through the double-positioning clamping block, the four-point contact pulley block and the ratchet wheel system, it can be guaranteed that the material plate is kept stable in the stamping process through the synergistic effect of the driving wheel and the movable wheel, deviation is avoided, and the stamping quality is improved. And by controlling the downward moving distance of the rack, the rotation angle of the gear, the number of rotation turns of the first spline shaft and the final step pitch of the material plate driven by the driving wheel to move are adjusted.

An electromagnetic field assisted laser additive manufacturing device and method comprises a laser cladding mechanism, an electromagnetic field regulation and control mechanism and an electromagnetic impact mechanism, the laser cladding mechanism plans and controls a deposition path of a laser cladding head through a laser cladding mechanical arm, and the electromagnetic impact mechanism plans and controls a moving path of an electromagnetic impact coil through an electromagnetic impact mechanical arm. The variable curvature characteristic of a deposition path in the additive manufacturing process is adapted; an electromagnetic field is introduced in the metal laser additive manufacturing process, a substrate is preheated through electromagnetic induction heating, a molten pool is regulated and controlled through electromagnetic force, and metallurgical defects are reduced from the source; and meanwhile, by means of high-speed pulse electromagnetic force, synchronous impact is conducted on the surfaces and the side faces of the multiple layers of welding beads with the deposition path curvature continuously changing, then metallurgical defects such as air holes, incomplete fusion and cracks in the metal laser additive manufacturing process are restrained, grains are refined, residual stress is reduced or even eliminated, and high-performance and high-precision additive manufacturing of metal forming parts is achieved.

The purpose of the present invention is to newly provide a mesoporous metal thin film and a method for producing a mesoporous metal thin film.　This mesoporous metal thin film is formed on a substrate, wherein (i) the surface of the substrate is made of an insulating material, or (ii) the material constituting the surface of the substrate is a metal having a higher ionization tendency than the metal forming the mesoporous metal thin film, and a gap is partially provided between the substrate and the mesoporous metal thin film.

The invention provides a forming method and a forming die for a ribbed skin product, relates to the technical field of metal forming, and aims to solve one of the technical problems that the ribbed skin product is long in processing time consumption, difficult to release residual stress, difficult to guarantee dimensional precision and strength and high in cost. The forming method of the ribbed skin product comprises the following steps that a forming die is provided, and the forming die comprises a bracket and a bottom block; determining a blank model according to the model of the ribbed skin product, and cutting the blank according to the blank model; the cut blank is placed in a forming die, and the blank is located on the bottom block; and the blank is rolled through a pressing roller, and a ribbed skin product is formed. The forming method is short in processing time consumption.

The invention discloses a follow-up type double-face induction heating auxiliary incremental forming device, method and equipment and a medium, and relates to the field of sheet metal forming. The forming tool heads are fixed to the tail end of the mechanical arm, the two sides of the to-be-machined plate are each provided with one forming tool head, and the forming tool heads are used for extruding the to-be-machined plate to enable the to-be-machined plate to deform; and the electromagnetic induction heating device is rotationally connected with the mechanical arm through a mounting bracket, and the electromagnetic induction heating device is used for providing an electromagnetic field to heat the to-be-processed plate. And the processing performance of the plate is improved in an electromagnetic induction auxiliary heating mode.

The invention provides a multi-manipulator collaborative cabin integrated additive manufacturing method and system. The multi-manipulator collaborative cabin integrated additive manufacturing method comprises the steps that a novel cabin coaxial powder feeding laser additive manufacturing model is established; segmenting into blocks according to the features; performing layered slicing according to the structural characteristics of the segmented blocks; performing track filling on each slice layer of each segmented block according to the shape characteristics of the slice layers; an optical head is selected for additive manufacturing according to the structural features; manufacturing is completed through heat treatment, machining and detection, and a final product is obtained. A coaxial powder feeding laser additive manufacturing mode is adopted, integrated forming of the cabin skin and the built-in hanging point can be achieved, compared with a traditional manufacturing mode, the flexibility degree is higher, and the problem that the welding seam quality is difficult to guarantee due to welding and machining after metal plate forming is avoided; the method saves the processing cost and period, adapts to complex design, and can accelerate the novel iteration speed.

The invention belongs to the technical field of metal forming machining, and provides a micro-channel structure manufacturing process which comprises the steps that channels are machined in the surface of a raw material plate, and a bottom plate is obtained; diffusing and welding a cover plate on the surface of the bottom plate to cover the bottom plate to obtain a first prefabricated plate; forming a groove in the surface of the first precast slab to obtain a second precast slab; pressing and forming the second precast slab by using a mold to obtain a third precast slab; and the groove in the surface of the third prefabricated plate is subjected to filling welding to obtain the micro-channel structure with the curved surface. Before compression molding, the grooves are formed in the surface of the first prefabricated plate on the outer side of the bending direction of the designed micro-channel structure, and the grooves can increase the extension degree of ribs between adjacent micro-channels, reduce the extension degree of the outer side walls of the micro-channels and even eliminate extension of the outer side walls of the micro-channels, so that the outer side walls of the micro-channels are prevented from being thinned; therefore, the wall thickness of the micro-channel is consistent, and the structural integrity and strength performance of the micro-channel are ensured.

The invention discloses a springback compensation control system for a metal stamping part, and belongs to the technical field of metal plate forming. The system comprises a stress memory prediction module, a fractal compensation analysis module, a phase change compensation regulation and control module, a compensation decision fusion module and an execution feedback optimization module. The stress memory prediction module extracts stress evolution characteristics of the stamping process through a multi-scale memory network and a time decay attention mechanism; the fractal compensation analysis module adaptively adjusts the compensation grid density based on the fractal dimension to realize optimal configuration of computing resources; the phase change compensation regulation and control module predicts the phase change behavior of the material through the thermal-mechanical coupling constitutive model and calculates the compensation correction amount caused by phase change; the compensation decision fusion module intelligently fuses three compensation strategies by adopting Bayesian reasoning and a spatial modulation function; and the execution feedback optimization module realizes continuous optimization of the system through online learning. According to the method, the influence of three dimensions of stress history, geometric complexity and material phase change is comprehensively considered, accurate prediction and compensation of the springback behavior are achieved, and the forming precision and production efficiency of the metal stamping part are remarkably improved.

The invention discloses a selective laser melting process parameter optimization method based on an artificial neural network. The method comprises the following steps: performing selective laser melting forming on metal powder; the influence rule of the selective laser melting process parameters on the metal forming density is determined through experimental testing, and a machine learning data set between the selective laser melting process parameters and the forming density is obtained; performing normalization and standardization processing on the machine learning data set; establishing an artificial neural network model; a nonlinear regression model is obtained; the nonlinear regression model is used as a forming density prediction model; determining the effectiveness and accuracy of the prediction model; and technological parameters of selective laser melting are optimized. The method has the advantages that rapid iterative optimization of the selective laser melting process parameters is achieved by building the forming density machine learning prediction model, the research and development efficiency of the additive manufacturing process is improved, and the method is reasonable in design, high in operability, simple, easy to implement and suitable for engineering application and popularization.

The utility model relates to the technical field of power distribution cabinet processing, in particular to a power distribution cabinet sheet metal punch forming device which comprises a base, a supporting vertical plate and a top plate, sheet metal forming lower dies are installed at the two ends of the top of the base through supporting plates, and sheet metal forming cavities are formed in the sheet metal forming lower dies. The corners of the bottom of the metal plate forming cavity are each provided with a stator groove, the bottom of each stator groove communicates with a reserved hole, a top piece is arranged in each stator groove, and a top rod is welded to the bottom of each top piece and penetrates through the corresponding reserved hole. An electric cylinder B is connected to the position, located between the supporting plates, of the top of the base through a connecting disc, and a connecting plate is installed on an output shaft of the electric cylinder B through a screw; according to the power distribution cabinet metal plate punch forming equipment, automatic demolding and discharging are achieved, the material blocking phenomenon is avoided, force application and pushing are conducted at the four corners of the bottom of a power distribution cabinet metal plate at the same time, and deformation of the power distribution cabinet metal plate during demolding is avoided.

The invention relates to the technical field of sheet metal forming, in particular to a forming die and method for an annular sheet metal part with a groove. The forming die comprises a lower die plate and an upper die plate. A cone is installed on the lower die plate, a plurality of guide strips are evenly distributed on the cone, and expansion blocks are installed on the guide strips in a sliding mode. A top plate is placed on the top face of the lower die plate, and the bottom face of the expansion block abuts against the top face of the top plate. An ejector rod hole is formed in the lower template; a T-shaped sliding block is installed in the T-shaped groove of the top plate in a sliding mode. A concave die block is mounted on the T-shaped sliding block; a reset spring is arranged between the top plate and the T-shaped sliding block, and the reset spring exerts radial outward pulling force on the T-shaped sliding block. A wedge-shaped ring is mounted on the lower surface of the upper template; an annular body is arranged at the central position of the lower surface of the upper template; a groove is formed in the outer conical surface of the expansion block; a protrusion is arranged on the inner conical face of the female die block. After the part is formed, the wedge-shaped ring is separated from the female die block, and the female die block moves outwards to be separated from the formed part under the action of the reset spring.

The invention relates to the field of intelligent manufacturing, and discloses a metal component power spinning forming self-adaptive regulation and control method which comprises the following steps: establishing a virtual machining environment based on a constitutive model of a metal material of a metal component, a dynamic characteristic model of a machine tool and a springback model; in the virtual machining environment, a corresponding reward value is obtained by simulating the powerful spinning process and the springback process of the metal component; the feeding rate, the machining state and the reward value serve as input, a mapping relation is established through a deep learning algorithm, a trained control model is obtained, and the optimized feeding rate is output; and deploying the trained control model to a spinning machine motion controller to realize real-time control of the spinning machine. By means of the spinning wheel, the metal forming acting force of the spinning wheel can be changed, the stress-strain state of a plastic deformation area is improved, and the workpiece quality is improved.

The utility model belongs to the technical field of charging barrels for metal forming, and particularly relates to a semi-solid magnesium alloy charging barrel for a cold chamber die-casting machine and the cold chamber die-casting machine. The utility model provides a semi-solid magnesium alloy charging barrel for a cold chamber die casting machine, which comprises a machine barrel unit, a nozzle unit integrally formed with the machine barrel unit and arranged on a die assembly head plate, and a heating unit arranged on the machine barrel unit, the cylinder body of the machine cylinder unit is provided with an extraction valve and a feeding hole for realizing a vacuumizing process and feeding slurry, so that the influence of air leakage of a mold on the slurry is avoided through a simpler material cylinder structure, the difficulty of generating a high-vacuum-degree space in the material cylinder is reduced, leakage points of the material cylinder are further reduced, and the production efficiency is improved. The number of product air holes is reduced, and the production quality is improved.

The utility model belongs to the field of metal forming machining, and particularly relates to a water pump blade twisting die which comprises an upper die base and a lower die base and further comprises a male die, a female die, a limiting assembly and a guiding device, the male die is arranged below the upper die base, and the lower portion of the male die is provided with an upper die arc part; the female die is arranged above the lower die base, and the upper portion of the female die is provided with a lower die arc part matched with the upper die arc part. The limiting assembly comprises a push rod and an ejector rod, the ejector rod is arranged in the female die, and limiting protrusions are arranged at the four corners of the upper end of the ejector rod. The push rod is arranged in the male die; a plurality of limiting blocks are arranged at the lower end of the push rod; the guiding devices are symmetrically arranged on the two opposite sides of the male die fixing device and the female die fixing device. A stamped semi-finished blade is twisted into a required shape through the male die and the female die, air pollution cannot be generated in the manufacturing process, the blade is twisted and formed through the die, the production efficiency is improved, and the production cost is reduced.

A method for repairing a zone of a metal structural aircraft part having a protection defect in the vicinity of an orifice for receiving a fastener. There is a step of positioning an isolation element on the zone around the orifice, a step of applying a coat of paint to the zone, covering the isolation element, and a step of inserting a metal fastener into an orifice of the isolation element, prior to or following the step of applying the coat of paint. The metal of the fastener is in contact with the isolation element, itself in contact with the metal forming the aircraft structure.