169 results about "Metal flow" patented technology

The invention provides a wire harness crimping quality intelligent detection and self-adaptive control method and system, and the method comprises the steps: calculating a stress distribution value of a crimping point through the obtained internal metal flow distribution characteristics in combination with a mechanical strength simulation algorithm, and obtaining a mechanical strength evaluation index; if the mechanical strength evaluation index is lower than a preset threshold value, triggering an alarm signal, extracting deviation type data from the alarm signal, and judging a quality judgment result; generating a feedback control instruction according to the judged quality judgment result, transmitting the feedback control instruction to crimping equipment to adjust crimping force parameters, and obtaining optimized crimping process data; updating a real-time monitoring database by adopting the obtained optimized crimping process data, and determining a geometric parameter reference value of a subsequent crimping batch; and matching the determined geometric parameter reference value with a vehicle safety requirement to obtain a final quality verification report.

This invention provides a thickness control method for a single-stand reversible cold rolling mill. The single-stand reversible cold rolling mill unit includes an inlet coiler, an outlet coiler, a mill body, a mill hydraulic system, an inlet thickness gauge, an outlet thickness gauge, an inlet speed gauge, an outlet speed gauge, an inlet tension gauge, and an outlet tension gauge. The single-stand reversible cold rolling mill unit also includes an S-roll, with S-rolls at both the inlet and outlet of the unit. The S-roll can rotate 180°, with the upper roll of the S-roll able to rotate to the lower roll position and the lower roll of the S-roll able to rotate to the upper roll position. The 180° rotation causes the strip steel to wind in an S-shape on the S-roll. The thickness difference of the strip steel is eliminated by adjusting the speed of the inlet S-roll to control the metal flow rate entering the roll gap.

The invention belongs to the field of profile steel production, and particularly relates to a rolling method of hot-rolled Q450NQR1 weather-resistant H profile steel, which adopts a reversible cogging mill and a universal finishing mill group for rolling: after the cogging mill rolls for 3-5 passes for cogging, a universal continuous rolling mill is adopted for finish rolling 9 continuous rolling, and the arrangement sequence of finish rolling hole patterns is U1-U2-U3-E4-U5-U6-U7-E8-U9; wherein the U3 and the U6 are curved web hole patterns, and the vertical roll is in drum-shaped design. The method has the advantages that one BD cogging mill is used for large-rolling-reduction rolling to crush crystal grains, and then the nine-rack universal continuous rolling mill is used for finish rolling, so that the metal flowing and steel biting conditions are improved. The grain structure is refined through large rolling reduction and low-temperature rolling, the problems that the Q450NQR1 weathering resistant steel is poor in metal fluidity, prone to cracking and the like due to alloy elements are effectively solved, and meanwhile the mechanical property, the size precision and the surface quality of products are guaranteed.

The invention belongs to the technical field of ring piece rolling forming and manufacturing, and discloses a design method for a complex special-shaped ring rolling preformed blank with inner and outer grooves based on metal flow regulation and control. The shape of a preformed blank is designed to be a special-shaped section annular blank with the height of an outer side groove lower than that of an outer side groove of a target ring piece; the deformation amount of the pre-rolling step and the deformation amount of the final rolling step are distributed, the total deformation amount, the deformation amount of the pre-rolling step and the deformation amount of the final rolling step in the ring rolling process are determined through the outer diameter ratio, and the numerical value relation among the three deformation amounts is met; on the basis of the deformation distribution result, various size parameters of the preformed blank are determined, and the size parameters comprise the height, the outer side transition area bevel angle, the outer side groove depth, the outer side groove outer diameter, the end face outer diameter and the inner diameter. According to the method, metal flowing regulation and control are achieved through multi-step rolling, metal is effectively promoted to fill the cavity, the defect of under-filling is avoided, and the material utilization rate and the preformed blank design efficiency are improved.

The utility model discloses a molten aluminum runner prefabricated part structure with a thermal insulation layer, which belongs to the technical field of metal diversion trenches and comprises a base, a diversion trench and a top cover. The flow guide groove is composed of a high-temperature contact plate, a ceramic fiber plate, a reflecting film and a protective shell which are sequentially connected from inside to outside in a sleeved mode, the top cover is connected to the top of the flow guide groove, the top cover seals the top of the flow guide groove, and heat loss generated when aluminum water flows can be reduced; the heat preservation performance in the aluminum water conveying process can be remarkably improved, and oxidation and pollution are reduced.

The utility model relates to the field of industrial die casting, especially to the die casting die of automobile engine casing, including support frame, still including connecting frame and liquid storage box, be provided with die casting on the support frame, and the die casting includes bottom die, upper die and injection chamber, the utility model discloses through the telescopic link of cylinder drive liquid storage box is located in the upper end of support frame and carries out the sliding in position, and through the output of liquid storage box top while sliding the lower end of upper die and the upper end of bottom die are carried out the work of spraying release agent, through the upper die on the die casting and move downward, make the upper die drive second limit rod downward displacement drive slider and move downward, make the lower end of upper die and the upper end of bottom die mutually adhere, then inject liquid metal from injection chamber, liquid metal flows to the gap between bottom die and upper die and die casting forming, after forming, the upper die moves upward, the casing on the bottom die passes through the upward thrust of the reaction force of spring of lower slider, realize the work of automatic release of casing.

The invention relates to the field of profile manufacturing, in particular to a forming method of a 5A30 aluminum alloy F-shaped profile and an extrusion die for preparing the F-shaped profile. According to the forming method of the 5A30 aluminum alloy F-shaped sectional material, the specifically-designed flow guide mold is additionally arranged in front of the sectional material mold to increase pre-deformation of metal, the extrusion technology is optimized, and the forming problem of the 5A30 aluminum alloy F-shaped complex sectional material is solved. According to the invention, the flow guide holes are adopted to increase the geometric similarity of the blank and the profile, so that the flow of metal is conveniently controlled, particularly, the flow rate of metal can be adjusted for extruding the F-shaped profile with large section difference, and the formation of the F-shaped profile with large wall thickness difference, complex shape and high difficulty is improved by combining with a specific extrusion speed. Meanwhile, twisting and bending deformation of the F-shaped profile can be reduced, the stress condition of the die is improved, and the service life of the die is greatly prolonged.

The present application relates to the technical field of plastic precision forming of metal profiles, and specifically to a precision plastic forming method and equipment for metal profiles. The equipment is provided with an upper die movement mechanism and a lower die setting mechanism. The movement execution mechanism of the upper die movement mechanism is installed with a bus roller set. The lower die plate of the lower die setting mechanism is installed with a bottom die cavity with different profile structures. Through one-way linear movement of the hydraulic cylinder of the movement execution mechanism and extrusion and shearing of the bus roller set, metal flow fills the bottom die surface to realize the processing of the metal profile. The present application can be used for the forming of metal profiles with different specifications and cross-sectional forms, including but not limited to channel steel, bulb steel and other products. The present application can be used for ferrous metals, non-ferrous metals, composite materials and the like, and can also be used for hot forming, warm forming and cold forming. The present application is a local incremental forming method, which has the advantages of high forming efficiency, high product size precision, small springback, good flatness, small forming force and the like.

The invention relates to the field of aluminum profiles, and particularly discloses an aluminum profile for a bicycle frame, a preparation method of the aluminum profile and the bicycle frame. The preparation method comprises the following steps: (1) preparing raw materials; the formula of the raw materials comprises 0.4%-0.8% of Si, 1.0%-1.2% of Mg, 0.5%-1.0% of Cu, 0.01%-0.1% of Mn, 0.01%-0.1% of Cr, 0.1%-0.5% of Zn, 0.3%-0.8% of Fe, 0.1%-0.2% of Ti, 0.01%-0.05% of Sc and the balance Al and inevitable impurities. (2) smelting and casting; (3) homogenizing treatment; (4) extruding; (5) aging treatment; the extrusion die comprises a male die and a female die which are fixedly connected, and the male die comprises a die core, a die bridge and a shunting hole; in the direction from the male die to the female die, the die bridge deflects clockwise or anticlockwise, and the extension line of the die bridge to the die core deviates from the center line of the die core; and the extrusion metal flow rotates clockwise or anticlockwise in the flowing process. By implementing the method, the mechanical property and the corrosion resistance of the aluminum profile can be improved.

The present application relates to a kind of composite structure cold heading extrusion die, including upper die and lower die.The upper die is the overall flat bottom angle convex die, and the shaped end face is provided with the profile contour of twelve-angle and flange composite.The lower die adopts transverse segmentation type three-layer concave die structure, and is sequentially from inside to outside working die core and insert, inner layer and outer layer prestressed ring, press sleeve;Working die core and / or insert adopt Cr12MoV and are quenched by vacuum tempering, and press sleeve adopts 45 steel.The lower die is provided with the unloading rod of stepped inner cavity, and is matched with the lower end of convex die when die is closed, and metal flow is constrained, and is independently pushed up when die is opened Demoulding.The present application is dispersed by prestressed ring layering constraint load, and stress concentration is slowed down, and metal flow is improved by unloading rod and the risk of sticking die is reduced, with the advantages of high forming precision, smooth unloading, long service life, suitable for the cold heading forming of complex special-shaped head workpiece.

The embodiment of the invention discloses a metal flow stress prediction method and system based on multi-physics field attention, and the method comprises the steps: carrying out the material characteristic coding of the material components and microstructure parameters of a metal material through employing a material characteristic embedding layer of an improved Kolmogov-Arnod network KAN, and obtaining the material characteristics of the metal material; obtaining a characteristic vector of the metal material; carrying out weighted fusion on a plurality of physical field parameters corresponding to isothermal strain measurement by adopting a multi-physical field attention layer of an improved KAN to obtain a high-order feature vector; and performing flow stress prediction on the high-order feature vector and the feature vector based on the temperature value of the isothermal strain measurement by adopting the improved KAN mixed sensing layer to obtain the flow stress of the metal material under the isothermal strain measurement. The accuracy of flow stress prediction can be improved.

This invention discloses a method for synchronous and progressive axial gradient forming of a large-diameter-ratio hollow shaft with a large inner diameter. The method involves pushing the hollow shaft blank axially. When the end of the first expansion section enters the inner hole of the hollow shaft blank, the first set of skew rolls simultaneously begins skew rolling the front end of the hollow shaft blank, causing the hollow shaft blank to undergo the first stage of plastic deformation under the bidirectional compression of internal expansion and external rolling. The hollow shaft blank continues to move axially in the same direction, sequentially passing through each local synergistic deformation zone, resulting in multi-stage continuous plastic deformation until the synergistic forming of the large-diameter-ratio hollow shaft with a large inner diameter is completed. The advantages are that this method allows the large inner diameter expansion and large-diameter-ratio external diameter reduction to be completed in stages during continuous feeding, reducing the risk of deformation concentration, sudden changes in local deformation, and instability caused by single-pass large expansion and single-pass large diameter reduction. It also improves the metal flow coordination of the large-diameter-ratio hollow shaft during the forming process and enhances the forming quality of the hollow shaft.

The invention discloses a welding parameter closed-loop control method and system based on liquid flow prediction, and belongs to the technical field of welding control. The method comprises the following steps: firstly, carrying out functional partitioning on a connection area according to geometric information and material thermophysical parameters of the connection area of a welded workpiece, and determining a liquid flow target parameter of each partition; and screening and simulating different molten drop candidate drop points in combination with connection area structure information to obtain corresponding drop point liquid flow characteristic data, thereby determining a molten drop accumulation priority and generating a welding parameter dynamic sequence. In the actual welding process, molten drop accumulation and liquid flow states are continuously obtained, the liquid metal flowing trend is predicted and compared with a preset planning target, when the deviation exceeds a threshold value, welding parameters are dynamically adjusted, and closed-loop welding control driven by liquid flow prediction is achieved. According to the scheme, liquid metal flowing is monitored and predicted in real time, and the welding seam quality and stacking consistency are improved; welding parameters are dynamically adjusted to achieve closed-loop control, defects are reduced, and the stacking efficiency is optimized.

The invention discloses an automobile zero-match forge piece machining device, which belongs to the technical field of forging machining, and comprises a base component and a die component, the die component comprises a fixed die, a die cavity and strip grooves, a plurality of strip grooves are formed in the bottom surface of the die cavity, a draw bar assembly is movably arranged on a base and is linked with the base, and a rib assembly comprises a movable first rib plate and a movable second rib plate. By controlling the ribs to lift in stages and optimizing the metal flowing sequence, the requirement for forging and pressing peak tonnage can be greatly reduced, the defects of folding, cracking and the like are effectively reduced in the stable deformation process, high-quality forging of magnesium alloy and other materials difficult to form is facilitated, precise automatic control of the ribs in the non-load state is achieved, and the production efficiency is improved. And forming precision and production automation are ensured.

This invention relates to the field of fine grain processing technology and discloses a fine grain processing method for titanium alloy tube blanks for spinning, including the following specific process steps: S1 Precise blank selection and pretreatment: Select titanium alloy ingots with low impurities and uniform composition, and deeply remove surface oxide scale and inclusions through mechanical grinding and pickling to ensure the purity of the blank; S2 Intelligent control of multi-pass hot forging: Introduce an intelligent temperature control system to monitor and precisely control the furnace temperature in real time to ensure that the tube blank is quickly transferred to the forging equipment when heated to 1000°C; S3 High-efficiency channel extrusion synergistic processing: Adopt advanced equipment integrating heating and extrusion, and seamlessly connect the extrusion process of the tube blank under precise heat preservation at 925°C; The die rotation angle is optimized to 105°, and with the parameter setting of extrusion ratio 5, the metal flows through the channel and is subjected to uniform and high-strength shear force; S4 Ultrasonic-rolling integrated processing; S5 Precise cyclic heat treatment strengthening.

The invention discloses a contact pin part cold extrusion forming process, a die and a die using method. The contact pin part cold extrusion forming process comprises the steps of bar punching and blanking, sand blowing, cleaning, primary extrusion, deburring, sand blowing, cleaning, secondary extrusion and machining. The forming die comprises a first-order extrusion die and a second-order extrusion die. Through combination of first-order extrusion and second-order extrusion, material flow of the first-order extrusion and the second-order extrusion can be reasonably distributed, plastic forming of metal is facilitated, and the service life of the die is prolonged; as the junction of the waist-shaped column and the T-shaped connecting main body is in a sharp corner state, a forge piece forming metal flowing mode is changed through a two-sequence extrusion mode, the problem of material tearing at the sharp corner is avoided, the streamline of the part is complete, the mechanical property is good, and the conductivity of the part is ensured; secondary forming is matched with little machining, the cutting allowance and the cutting face are reduced, the utilization rate of raw materials is increased, the production efficiency is improved, the production cost is reduced, and the market competitiveness is improved.

The invention relates to a method for controlling the uniform wall thickness of a radially forged hollow component. The method comprises the following steps: selecting a pipe blank and a core rod for hollow forging, wrapping the surface of one end of the pipe blank, painting an inner hole with an anti-oxidation coating, heating the pipe blank and lubricating the inner hole of a hot blank with glass powder, adopting proper rolling reduction during forging, configuring a blank feeding speed and a rotating angle of a precision forging machine during forging, controlling a forging sequence, and finishing and straightening at a high temperature. The high-precision hollow pipe blank and the core rod are adopted, and in order to achieve uniform deformation, friction is reduced from the temperature uniformity, anti-oxidation and lubrication modes of the blank; in order to ensure that metal flows are consistent, requirements are put forward from the aspects of forging deformation sequence and deformation parameter configuration; bending caused by forging and high-temperature normalizing is eliminated through radial warm forging, a key technology for controlling the wall thickness difference of the radial forging 40CrNi4Mo1V steel hollow component is formed, the wall thickness difference of a blank forging piece of the hollow component is smaller than or equal to 5 mm, the out-of-roundness of an inner hole is smaller than or equal to 3 mm, and the rough machining condition is met.

The invention provides a metal flow limiter with a pore plate structure and a rapid design method thereof, and the method comprises the steps: carrying out the flow-pressure difference test of a metal flow limiter without a superposed pore plate, fitting the test data into a flow velocity-original pressure difference relation curve, building a metal flow limiter fluid simulation model, and carrying out the finite element mesh division. The method comprises the following steps: setting fluid medium parameters, defining porous medium attributes, carrying out analogue simulation, repeating the previous steps on a metal flow limiter of a superposed pore plate, obtaining a corresponding data relationship between the pore diameter of the pore plate and the total pressure difference under fixed flow, defining an insufficient development factor theta to obtain a relational expression between the pore diameter and the insufficient development factor, and finally obtaining a relational expression including the flow, the total pressure difference and the pore diameter of the pore plate. The problems that in the prior art, a calculation model fails, design efficiency is low, and adaptability is poor are solved, the pore plate and the sintered filter element are combined to adapt to a wide flow range, the method is suitable for high-purity and high-pressure fluid flow limiting scenes, and remarkable economic and technical benefits are achieved.

The utility model discloses a roller for spin forming of a forged aluminum alloy hub, which comprises a roller body, and an annular initial arc part which is concave inwards, an inclined surface part which is inclined downwards from inside to outside, a roller round corner part which is convex outwards and a belly round corner part which is convex outwards are sequentially arranged on the outer wall of the roller body from top to bottom. The belly round corner part is arranged on the inner side of the roller round corner part; the round corner radius of the roller can be increased conveniently, the overall thickness of the roller can be increased conveniently, and therefore the service life of roller parts is prolonged, and the spinning machining efficiency is improved. The forming fillet radius is optimized, metal flows smoothly in the blank spinning process through the belly fillet part, spinning forming is facilitated, and the machining efficiency is better improved.

The invention discloses a high-broadening-rate drawing-out forging method for a difficult-to-deform high-silicon alloy electroslag round ingot. Direct forging and drawing-out forging with few forging heating numbers are achieved. A conventional free forging device, a flat anvil, a common forging tool and a small round ingot are adopted, under the condition of six forging heating numbers, deformation of each heating number and the heating temperature range are optimally matched, large rolling reduction and vertical face light pressing are controlled in a staged mode to be combined to promote broadening, straightness, chamfer forging angles, step length and the shape of an intermediate blank are controlled, and forging precision is improved. Deformation of the blank is gradually transferred from the surface layer to the core part, and the forging structure is improved through the high deformation rate; sufficient metal flowing is ensured, so that the blank obtains larger deformation in the width direction, and stable deformation with high broadening rate is realized; and the surface quality and thermoplasticity are improved by adopting a rolling mode in the key heating number. And the wide forging stock with good surface quality is obtained only in a drawing-out forging mode, and the broadening rate is remarkably increased by 10% or above.

This invention relates to the field of metallic materials technology and discloses a method for improving the performance utilization rate of metallic materials based on multi-directional forging. This method first performs homogenization annealing pretreatment and initial microstructure quantitative characterization on the target metal billet to determine the critical deformation parameters and hot working window of the material. Then, the multi-directional forging is divided into three consecutive stages: pre-forging, main forging, and final forging. Process parameters for each stage are customized, and a differentiated progressive reversing forging path is adopted to collaboratively control the deformation uniformity and metal flow line orientation in each direction. After final forging, gradient temperature-controlled cooling is used to achieve microstructure transition regulation, and combined with microstructure-matching heat treatment, the performance of the forging is homogenized across the entire cross-section. Finally, the machining allowance is optimized based on the differentiated performance distribution of the forging. This invention solves the problems of mixed-grain microstructure, large performance anisotropy, and low utilization rate in traditional multi-directional forging.

The invention relates to the field of aluminum profiles, and particularly discloses a rotary aluminum tube based on a forward extrusion process and a preparation method thereof. The preparation method comprises the following steps: (1) heating an aluminum alloy cast ingot, and loading the aluminum alloy cast ingot into an extrusion container; (2) extruding the aluminum alloy in the extrusion cylinder to an extrusion die by adopting an extrusion rod; wherein the extrusion die comprises an upper die and a lower die, the upper die is provided with die bridges, and shunting holes are formed between the adjacent die bridges; the lower die comprises a welding chamber and a die hole; (3) under the action of the pressure of the extrusion rod, the die bridge splits the aluminum alloy cast ingot, and metal flow flowing along the flow dividing holes is formed; in the direction from the upper die to the lower die, the die bridge deflects clockwise or anticlockwise, and the extension line, pointing to the die core, of the die bridge deviates from the center line of the die core, so that the metal flow rotates clockwise or anticlockwise in the flowing process; (4) under the action of the pressure of the extrusion rod, the metal flows flowing out of the flow dividing holes enter a welding chamber, and the multiple strands of metal flows flowing out of the multiple flow dividing holes are welded again in the welding chamber; (5) under the action of the pressure of the extrusion rod, enabling the re-welded metal flow to flow into a working belt formed between the die core and the die hole, and forming to obtain a rough blank; and (6) the rough blank is quenched and aged, and the rotating aluminum pipe is obtained. By implementing the method, the mechanical property of the aluminum pipe can be improved.

The utility model relates to the technical field of centrifugal fans, and discloses a multistage noise reduction flow guide structure of a centrifugal fan, which comprises a centrifugal fan main body, the inner wall of the centrifugal fan main body is fixedly connected with sound absorption cotton, one end of the centrifugal fan main body is fixedly connected with a flow guide cylinder, and the inner wall of the flow guide cylinder is fixedly connected with a noise reduction component. A dustproof assembly is arranged at one end of the guide cylinder, the noise reduction assembly comprises a double-layer micro-perforated plate arranged on the inner wall of the guide cylinder, a honeycomb metal guide plate is fixedly connected into the double-layer micro-perforated plate, and the dustproof assembly comprises a mounting plate arranged at one end of the guide cylinder. According to the multi-stage noise reduction flow guide structure of the centrifugal fan, by arranging the sound absorption cotton, the reinforcing layer and the noise reduction assembly, the purpose of multi-stage noise reduction is achieved, the situation that when airflow enters the air inlet, vortexes can be formed, generated airflow turbulence collides with the fan in a large amount, and large noise is generated is avoided, and sound pollution generated by the centrifugal fan can be improved.

The invention relates to the field of aluminum profiles, and particularly discloses an aluminum profile for an air damper, a preparation method of the aluminum profile and the air damper. The preparation method comprises the following steps: (1) preparing raw materials; the formula of the raw materials comprises 0.8%-1.1% of Si, 0.7%-1.2% of Mg, smaller than or equal to 0.2% of Cu, 0.5%-0.8% of Mn, 0.05%-0.2% of Cr, smaller than or equal to 0.2% of Fe, smaller than or equal to 0.1% of Zn, 0.03%-0.1% of Ti and the balance Al and inevitable impurities. (2) smelting and casting; (3) homogenizing treatment; (4) extruding; (5) quenching; (5) aging treatment; the extrusion die comprises a male die and a female die which are fixedly connected, and the male die comprises a die core, a die bridge and a shunting hole; in the direction from the male die to the female die, the die bridge deflects clockwise or anticlockwise, and the extension line of the die bridge to the die core deviates from the center line of the die core; and the extrusion metal flow rotates clockwise or anticlockwise in the flowing process. By implementing the method, the mechanical property, the pressure resistance and the corrosion resistance of the aluminum profile can be improved.

This invention relates to the field of aluminum profiles, specifically disclosing a hard aluminum alloy tube and its preparation method. The preparation method includes: (1) melting and casting aluminum alloy raw materials to obtain a hard round ingot; (2) heating the hard round ingot and loading it into an extrusion cylinder; (3) using an extrusion rod to extrude the aluminum alloy in the extrusion cylinder into an extrusion die; (4) splitting the hard round ingot with a die bridge to form a metal flow along a diversion hole; (5) allowing the metal flow from the diversion hole to enter a welding chamber, and the multiple metal flows flowing out through multiple diversion holes to re-weld in the welding chamber; (6) allowing the re-welded metal flow to flow into the working zone formed between the die core and the die hole to form a rough blank; (7) quenching and aging the rough blank to obtain a hard aluminum alloy tube; wherein, the yield strength of the hard aluminum alloy tube is ≥380MPa. By implementing this invention, the forward extrusion forming of hard aluminum alloy tubes can be realized, and the mechanical properties of the tubes can be improved.

This invention provides a method for manufacturing high-toughness and ultra-high-strength steel pipes, comprising the following steps: 1) electric arc furnace smelting; 2) ladle refining; 3) VD vacuum degassing; 4) continuous casting; 5) low-temperature annealing; 6) through-hole drilling; 7) heating; 8) skew rolling piercing; 9) periodic pipe rolling; 10) mist cooling; 11) normalizing + tempering; 12) internal and external grinding. This invention, through electric arc furnace smelting + ladle refining + VD vacuum degassing + continuous casting, not only meets the requirements for high-purity steel with low phosphorus and low sulfur content, but also has lower smelting costs than other processes. By using a round billet center mill to add through-holes, the amount of piercing deformation is reduced, metal flow conditions are optimized, and internal and external surface defects under complex stress conditions during piercing are improved. Based on the integrated deformation of forging, rolling, and extrusion, four processes—forging and rolling, precision rolling, sizing, and pipe removal—are realized, which not only refines the product grains and makes the longitudinal and transverse properties uniform, but also improves the geometric dimensional accuracy and internal and external surface quality of the steel pipe.

The invention relates to a channel distributor for gas path distribution of multiple sensors of GIS equipment, the distributor realizes gas path distribution through a channel piece, one path preferentially provides stable high-pressure gas flow for a density sensor through a high-pressure straight-through channel, and the requirement of the density sensor for high-pressure gas is met; the other path passes through a pressure-reducing flow-stabilizing channel, is firstly depressurized by a pressure-reducing valve, then passes through a metal flow stabilizer to form a stable low-pressure gas source, and is shunted to a plurality of independent branch channels to provide gas with stable flow velocity for a humidity sensor, a sulfur dioxide sensor and the like so as to complete monitoring of different gas parameters; in the working process, the fluororubber O-shaped ring seals a connecting gap, the micro pressure sensor monitors pressure abnormity and gives an early warning, and all input and output interfaces adopt safe quick-plug connectors to prevent mistaken disassembly; modularized assemblies are adopted, installation, debugging and overhauling are convenient, and the integration degree and reliability of gas circuit distribution of multiple sensors of GIS equipment are effectively improved; the device has the advantages that the structure is reasonable, different gas parameters are monitored, and the monitoring accuracy is improved.

The invention discloses a preparation method of a cyclic reducing high-performance external gradient structure aluminum magnesium alloy pipe blank, and belongs to the technical field of metal plastic processing, the method adopts a cyclic reducing die, and a male die sliding plate vertically descends in a single time to drive a sliding assembly to do horizontal reciprocating motion, so that the pipe blank is subjected to multiple times of diameter expansion-necking circulation. In the expanding stage, the die core and the female die box body are matched to expand the outer diameter of the pipe blank; in the necking-down stage, metal flows directionally under the guidance of a back pressure cavity, large plastic strain is accumulated on the outer side of the pipe wall to achieve grain refinement, strain capacity on the inner side is decreased progressively, an outer gradient structure is formed, and the pipe blank can be subjected to the diameter expanding stage again through vertical upward reset of the male die sliding plate. According to the scheme, geometric forming and external gradient structure construction are synchronously completed in single-pass machining, the forming precision is high, gradient controllability is high, external fine grains of the prepared pipe are resistant to abrasion, internal coarse grains of the prepared pipe are good in toughness, the pipe is suitable for the high-end fields such as aerospace, the mold universality and maintainability are excellent, and the production efficiency is greatly improved.