3379 results about "Thin walled" patented technology

A placing seat is fixed to the upper portion of a base through a plurality of supporting columns in a suspended mode, a plurality of linear sliding grooves distributed in an annular array mode are formed in the placing seat, and an inner supporting piece and an outer pressing piece are installed in each linear sliding groove; a clamping push plate is connected between the multiple supporting columns in an up-down sliding and sleeving mode, a plurality of pushing pieces are installed on the clamping push plate, the pushing pieces are in sliding connection with the inner supporting piece and the outer pressing piece, and a plurality of position adjusting mechanisms distributed in an annular array are installed below the containing base in a sliding mode; a plurality of inner supporting pieces and outer pressing pieces which are distributed in an annular array mode are arranged above the containing base, two positioning rollers on the inner supporting pieces and the outer pressing pieces can synchronously move in the opposite directions from the inner side and the outer side, the inner wall and the outer wall of a workpiece are clamped at the same time, clamping force appears in pairs, radial force is offset, the workpiece mainly bears uniform centripetal force, and the deformation risk is greatly reduced.

The invention relates to the technical field of injection molding, and discloses a plastic part injection mold regulation and control system and method based on a complex curved surface and a thin-wall structure, and the plastic part injection mold regulation and control system based on the complex curved surface and the thin-wall structure comprises a mold modeling module, a temperature modeling module, a control modeling module, a control optimization module and a control execution module; the plastic part injection mold regulation and control method based on the complex curved surface and the thin-wall structure comprises the steps that a mold three-dimensional model and thermal control area mapping are built, a heat conduction model is built, modal dimensionality reduction is conducted, a target temperature field and a performance function are combined, optimal temperature regulation and control are achieved through a predictive control algorithm, real-time feedback is matched, and a heating and cooling unit is driven. And dynamic closed-loop control of the mold thermal field is realized. According to the method, thermal control precision and energy consumption efficiency are optimized through Galerkin modal dimension reduction, model predictive control and a weighted performance function, global closed-loop temperature control is achieved by combining mapping of a three-dimensional area and a heating and cooling unit of the mold, and system safety and stability are enhanced.

The invention relates to the technical field of welding, and discloses an intelligent control method and system for the welding process of a thin-wall metal component, and the intelligent control method for the welding process of the thin-wall metal component comprises the steps that an initial welding parameter set is determined, and time synchronization is conducted; obtaining multi-source original data with timestamps in the welding process; time alignment is carried out; respectively calculating a current stability index, a heat accumulation index and a molten pool width measured value to obtain a key deviation index; based on the key deviation index, current adjustment amount, pulse parameter adjustment amount and position compensation amount are obtained through calculation; obtaining an adjustment amount set; the current welding parameters are subjected to amplitude limiting updating, and an updated current welding parameter set is obtained through a step-by-step transition method and a high-priority fast instruction; recording a welding process data log, and judging a welding state; carrying out comprehensive evaluation and data storage on the welding process; according to the method, various dynamic changes in the welding process are comprehensively coped with, and the stability and consistency of the welding quality are improved.

The invention relates to the technical field of hydraulic test of nickel alloy pipes, and discloses a hydraulic test system for a thin-wall nickel alloy pipe. According to the system, in the axial loading state of the thin-wall nickel alloy pipe, a closed water pressure cavity is established through an annular sealing clamp, and then strain distribution data on the surface of the pipe body is collected through a distributed optical fiber sensor array. And constructing a three-dimensional stress field reconstruction model based on the acquired strain distribution data, calculating an equivalent plastic deformation threshold value of the pipe body under different water pressure gradients, adjusting a water pressure loading curve slope parameter according to the equivalent plastic deformation threshold value, and generating a dynamic water pressure loading instruction. And the high-frequency pressure pulse generator executes the instruction, synchronously triggers the X-ray diffractometer to collect lattice distortion data of the tube body, inputs the data into the material microscopic damage evolution model, and outputs a microscopic defect spatial distribution map. And finally, material constitutive parameters of the three-dimensional stress field reconstruction model are corrected based on the atlas, closed-loop feedback control is formed, and multi-dimensional data acquisition and accurate management and control of the thin-wall nickel alloy pipe hydrostatic test are achieved.

The invention relates to a machining path planning system, in particular to the technical field of intelligent manufacturing and numerical control machining, and overcomes the defect that a thermal coupling effect is ignored in traditional geometric planning by constructing an evolution model fused with a physical law. A dynamic decoupling algorithm is utilized to extract a real cutting load from multi-source data and reconstruct a rigidity field changing along with material removal in real time, the problem that a physical boundary is difficult to perceive under a complex working condition is solved, and the system effectively eliminates size out-of-tolerance caused by heat accumulation through transient deformation advanced prediction. According to the method, the non-linear error is actively counteracted in cooperation with a reverse compensation strategy based on sensitivity analysis, the machining precision and surface quality of the thin-wall weak-rigidity part are remarkably improved, the rejection rate and trial cutting cost are reduced, and intelligent closed-loop control over the manufacturing process is achieved.

The invention discloses an yttrium-rich neodymium-iron-boron magnet and a preparation method thereof, and belongs to the technical field of rare earth permanent magnet material preparation. The preparation method comprises the following steps: mixing yttrium-rich neodymium-iron-boron matrix alloy powder with grain boundary doped alloy powder containing Gd and / or Ho, and carrying out compression molding and sintering tempering treatment to obtain a first yttrium-rich neodymium-iron-boron magnet. According to the invention, the grain boundary doped alloy powder containing Gd and / or Ho is added into the yttrium-rich neodymium iron boron matrix alloy powder and then is sintered, so that a continuous and uniform non-magnetic thin-wall grain boundary phase structure is formed in the grain boundary, and the coercive force of the magnet is enhanced. Dy and / or Tb heavy rare earth element grain boundary diffusion is carried out based on the first yttrium-rich neodymium-iron-boron magnet after grain boundary modification, a second yttrium-rich neodymium-iron-boron magnet is obtained, the diffusion depth of Dy and / or Tb in the magnet can be increased, the utilization rate can be increased, the cost can be reduced, the coercivity of the magnet can be improved, and the adverse effect of Dy and / or Tb on residual magnetism can be reduced.

The invention relates to the related technical field of engineering pipeline detection, in particular to a pre-embedded hydraulic engineering pipeline pressure resistance detection device which comprises a base and a mounting frame fixedly mounted on the base, a sliding plate is slidably arranged on the base, and clamping pieces are symmetrically arranged on the sliding plate; the pressure testing mechanism is mounted on the mounting frame and comprises a limiting ring and a plurality of elastic detection pieces distributed along the circumference of the limiting ring; the reciprocating pushing piece is mounted on the mounting frame and is connected with the elastic detection piece; the intermittent driving part is mounted on the base, the plurality of elastic detection parts are controlled to rotate relative to the pipeline through temporary detection work intermittence of the elastic detection parts, and the pipeline can move relative to the elastic detection parts, so that the elastic detection parts can capture thin-wall and concave areas caused by non-uniformity of an extrusion die at different angles of the pipeline; and meanwhile, local strength insufficiency caused by defects of the extrusion die on the pipeline is rapidly positioned.

The invention discloses a magneto-rheological self-adaptive locking clamp for turning and a machining method of the magneto-rheological self-adaptive locking clamp, and belongs to the technical field of precision workpiece machining equipment. Comprising a flexible contact shell making contact with a workpiece, a locking unit arranged at the outer end of the flexible contact shell and an outer shell arranged outside the locking unit. The locking unit comprises an axial locking assembly and a radial pushing assembly, and the axial locking assembly is a self-adaptive locking assembly with an integrated magnetic circuit; the radial pushing assembly is a rigid pushing assembly. By means of the clamp, high-precision, lossless and self-adaptive locking of workpieces is achieved, and clamping deformation of thin-wall and special-shaped workpieces is effectively restrained. Through a composite mechanism of magneto-rheological locking and mechanical rigid pushing, the dynamic stability of the machining process is remarkably enhanced, meanwhile, it is ensured that the locking force is quick in response, low in energy consumption and stable in long-term work, and the machining quality and efficiency and the reliability of the clamp are improved.

The invention relates to the technical field of die-casting dies, and discloses a partitioned differential temperature cooling die-casting die for a complex aluminum alloy shell, which comprises a die body, and a thick-wall region, a thick-wall transition region and a thin-wall region are arranged in the die body; the mold body is provided with independent cooling units corresponding to the thin-wall area, the thick-wall transition area and the thick-wall area respectively, and each cooling unit is communicated with a cooling liquid transmission pipe through a self-adaptive sealing anti-leakage structure; thin-wall area cooling pipes arranged in a Z shape are installed on the outer side of the thin-wall area in an attached mode, spiral thick-wall transition area cooling pipes are installed on the outer side of the thick-wall transition area in an attached mode, and thick-wall area cooling pipes with built-in spoilers are installed in the thick-wall area in an embedded mode. According to the partitioned differential temperature cooling die-casting die for the complex aluminum alloy shell, through the partitioned independent temperature control cooling unit, the self-adaptive sealing anti-leakage structure and surface strengthening treatment, accurate cooling of regions with different wall thicknesses is achieved, the product forming quality is improved, the die universality is enhanced, the service life of the die is prolonged, and the maintenance cost is reduced.

The invention discloses a stainless steel thin-wall pipe bending forming production line control method and system. The method comprises the steps that state feature vectors are generated through data collection; establishing a hybrid network model, and optimizing hyper-parameters of the hybrid network model by using an OOA eagle optimization algorithm to obtain an improved hybrid network model; inputting the state feature vector into an improved hybrid network model, and outputting predicted values of the springback value, the wrinkling probability and the ovality which are about to occur in the current bending section; inputting the predicted value into a multi-objective optimization algorithm, and performing back calculation in real time to obtain an optimal compensation parameter set by taking minimization of springback, wrinkling risk and ovality as optimization objectives; and the compensation parameter set is transmitted to a physical execution unit for production line control including bending control, core rod control, clamping control and feeding control. And the first-pass yield of bending forming and the production control efficiency are improved.

The invention relates to the technical field of forge piece forming, in particular to a deep-cavity thin-wall support forge piece, a forging die and a forming method.The deep-cavity thin-wall support forge piece is characterized in that a heated round bar is subjected to roll forging to obtain a preformed blank, and oxide skin of the blank obtained after roll forging is removed; putting the prefabricated blank into a pre-forging cavity of a forming die, and performing pre-forging forming; after pre-forging is finished, the pre-forged piece is transferred into a precision forging cavity of the same forming die to be subjected to precision forging forming, and a bilaterally symmetrical precision forging piece is obtained; putting the bilaterally symmetrical precision forgings into a slicing die frame for trimming, and cutting off flashes; cutting the bilaterally symmetrical precision forgings subjected to cold shaping from the shunting bin through a cutting device, and separating the bilaterally symmetrical precision forgings into two independent single forgings; forming defects are eliminated, and the forging yield is improved to the level of stable mass production; the thickness tolerance of the functional surface of the product is ensured, the spot welding current stability and the welding strength are ensured, the assembly requirement is met, and the dependence on subsequent machining is reduced; the material cost is reduced and the mold life is prolonged.

The invention provides a flame-retardant magnesium alloy with efficient forming diversification and a preparation method of the flame-retardant magnesium alloy. The flame-retardant magnesium alloy comprises the following components in percentage by mass: 4.0-10.0% of Al, 0.2-1.6% of Ca, 0.01-0.5% of Mn, 0.1-1.5% of RE, less than or equal to 0.05% of inevitable impurities and the balance of Mg, and the added RE is one or any combination of Ce, Sm, La and Sr. The preparation method comprises the following steps: smelting and casting, granulating and pulping, and performing pressure injection molding. According to the preparation method, diversified efficient forming of complex curved surfaces, thin-wall parts, special-shaped components and the like can be achieved through cooperative regulation and control of components, the process and the structure, and the obtained flame-retardant magnesium alloy is compact in structure, has the multi-level structural characteristics including a spherical primary solid phase, a fine solidification secondary phase and a grain boundary net-shaped eutectic phase and meanwhile has good flame retardance and mechanical performance; the ignition point is 750-1200 DEG C, the yield strength is 130-200 MPa, the tensile strength is 230-300 MPa, the ductility is 5-20%, and the aluminum alloy is suitable for industrial production.

The invention relates to the technical field of pipe fitting laser welding, and discloses a laser welding device and process for machining a large-diameter thin-wall low-thermal-expansion alloy pipe, and the laser welding device for machining the large-diameter thin-wall low-thermal-expansion alloy pipe comprises a machine body, a welding table arranged on one side of the machine body, and a supporting assembly arranged on the welding table and used for supporting. The two alloy pipes are arranged at the top of the supporting assembly and used for welding, the laser welding gun is arranged on the welding table and located on one sides of the alloy pipes, the rotating motor is arranged on one side of the machine body, the clamping base is arranged on one side of an output shaft of the rotating motor, and the clamping unit is arranged on the clamping base. Local stress concentration is avoided through cooperation of air bag clamping and a moving plate, an air bag cavity of the clamping assembly is matched with the moving plate of the auxiliary assembly to form a two-way pressure control structure, when the air bag is inflated and expanded, directional expansion can be achieved, the clamping contact area can be enlarged, and thin wall sinking caused by point contact or line contact is avoided.

The invention provides a real-time prediction method and system for milling deformation of a thin-wall part and electronic equipment. The method comprises the steps that a partial differential equation set used for reflecting the deflection and stress coupling relation in the milling machining process of the thin-walled workpiece is constructed based on a von Karman control equation set; constructing a deformation prediction model based on a depth operator network; according to the partial differential equation set, constructing a loss function comprising a partial differential equation residual term and a boundary condition term; training the deformation prediction model according to the loss function and two-dimensional coordinate points and load function sampling points used for training the deformation prediction model; and deploying the trained model in a machine tool system, inputting real-time load data and real-time coordinate data of the thin-wall part in the milling process, predicting deformation response of the thin-wall part in the milling process, and obtaining a target prediction result. The method can quickly and accurately predict the deformation response of the thin-wall part under the complex load working condition, and improves the machining quality and efficiency of the thin-wall part.

The invention discloses efficient cutting equipment for aluminum alloy thin-wall part production, and belongs to the technical field of cutting equipment.The efficient cutting equipment comprises a base, a cutting mechanism, a positioning mechanism and a cooling mechanism are arranged at the top of the base, and the cutting mechanism comprises a connecting cylinder, a rotating cylinder, two mounting frames and two cutting discs; and a transverse shaft and a vertical shaft are rotationally mounted in the mounting frame. Through the synergistic effect of the cutting mechanism, the positioning mechanism and the cooling mechanism, the machining efficiency and quality are remarkably improved, the composite motion mode of rotation and circumferential feeding of the double cutting discs is adopted, the radial feeding speed which is dynamically adjusted is combined, cutting loads are evenly distributed, and vibration and stress concentration are reduced; the cooling mechanism realizes precise cooling through an injection system synchronously tracking the cutting position, and thermal deformation and oxidation are inhibited; an infrared thermometer and a pressure sensor are integrated to monitor the temperature and the cutting resistance of the cutter in real time, the rotating speed and the feeding amount are adjusted in a self-adaptive mode based on feedback signals, and overload and overheating are avoided.

The invention belongs to the field of machining, and particularly relates to a precise centering clamp for an annular thin-wall part. A precise centering clamp for an annular thin-wall part is reasonable in structure, has the self-adaptive adjusting capacity and can achieve precise centering. The precise centering clamp comprises a clamp base and the like. A bottom supporting piece is arranged at the top of the clamp base and can support and place workpieces with different diameters, a circle of rails are arranged on the top of the clamp base in the radial direction of the clamp base, adapters are arranged on the rails in a sliding mode and are in an L shape, clamping jaw bodies are connected to the inner side faces of the adapters, and the clamping jaw bodies can be detached. According to the clamping jaw, the clamping jaw body is divided into two parts through the arc-shaped groove, the clamping jaw body has an open space, so that the two faces of the clamping jaw body can make contact with the outer side wall of the annular thin-wall part, the stress points of the clamping jaw body and the annular thin-wall part are increased, the annular thin-wall part is better fixed, and the clamping jaw body can be prevented from being damaged due to stress.

The invention discloses a plastic pipe crack positioning method, which belongs to the technical field of nondestructive inspection, and comprises the following steps: constructing a pipe three-dimensional coordinate system, setting a three-dimensional contour scanning method, generating an effective point cloud, calculating the surface curvature of the effective point cloud, planning a detection path, generating an optimal detection path, and avoiding mechanical collision between a probe and a pipe structure. The optimal detection path is converted into a control signal, a pressure control method is set, the pre-tightening force of the position to be detected is calculated, pressure compensation is carried out on the hardened abnormal surface, so that the thin-walled tube is prevented from being damaged by pressure or the hard surface is prevented from being scratched, and the contact pressure is dynamically adjusted; transmitting sound waves to the to-be-detected position, setting a crack positioning method, performing crack detection, judging whether the to-be-detected position has defects or not, calculating a crack confidence coefficient, setting a threshold value to judge a true crack, setting a crack evaluation method, calculating a risk score of the crack, and generating a three-dimensional network model of the pipe. And the precision, efficiency and safety of plastic pipe detection are improved.

The invention discloses an active vibration suppression and deformation compensation device for high-precision thin-walled part machining, and relates to the technical field of machining equipment. The device comprises a base module, a clamping positioning module, a multi-source sensing monitoring module, a cooperative actuation vibration suppression module, a multi-point flexible compensation module, an intelligent control module and a machine tool cooperative interface module. The multi-source sensing monitoring module synchronously collects vibration, deformation, cutting force and temperature signals in the machining process. The intelligent control module processes signals and drives the cooperative actuation vibration suppression module (including a piezoelectric actuator group and a voice coil motor follow-up supporting unit) to perform broadband vibration suppression, and meanwhile drives the multi-point flexible compensation module (including a flexible supporting matrix and a path compensation interface) to perform local and overall deformation compensation. Synchronous monitoring and active cooperative control of vibration and deformation are achieved through closed-loop control, the machining precision, the surface quality and the machining efficiency of the thin-wall part are remarkably improved, compatibility is good, and the adaptive range is wide.

The application provides a spacecraft thin-wall cabin lightening groove online measurement and compensation processing method, comprising the following steps: installing a thickness measuring head; setting a measurement point on the surface of each to-be-processed lightening groove and obtaining a theoretical thickness and an outer contour position; measuring the actual thickness of each measurement point and obtaining an actual outer contour position; calculating a compensation value of each measurement point according to the theoretical value and the measured value of the thickness and the outer contour; judging whether the compensation requirement is met according to the compensation value, if yes, processing after compensating the tool length based on the comprehensive compensation value, if not, reconstructing the processing surface based on the actual thickness and the outer contour position, and processing by using the initial tool length based on the reconstructed processing surface. The application calculates the compensation value according to the contour and thickness data, and finally processes by calling the compensation value, thereby improving the automation degree of measurement and processing, realizing efficient and high-precision processing of the spacecraft thin-wall cabin lightening groove and ensuring the thickness size precision.

The present application relates to the technical fields of laser additive manufacturing, and discloses a kind of metal matrix composite composite additive manufacturing methods, comprising: the mixing of pre-prepared composite powder, substrate pretreatment, laser bottom layer cladding preparation bottom layer structure;Electron beam selective melting additive preparation main functional layer, obtain rough parts;Rough parts post-processing.The present application improves the wettability between metal matrix and TiC reinforcing phase through the transition effect of laser cladding bottom layer and hot isostatic pressing post-processing, improves the interface bonding strength, avoids the interface peeling problem under load;Through laser cladding, realize rapid bottom layer forming, electron beam selective melting ensures high-precision functional layer manufacturing, and is suitable for the integrated manufacturing of complex structure (such as hollow, thin-walled) metal matrix composite parts.

The invention relates to a casting method for a low-pressure alloy casting of a riser-free sand mold. The casting method comprises the steps that molten alloy is injected into a casting cavity through a plurality of flow gates in the bottom of the casting cavity in a low-pressure mode for mold filling; during mold filling, the variable-diameter air outlet needle arranged above the casting cavity is used for exhausting air; after mold filling is completed, stepped pressurization and pressure maintaining are conducted on the molten metal in the casting mold cavity; and when the casting is solidified, the thick and large part at the top of the casting cavity is cooled in an accelerated manner, so that the casting is solidified from bottom to top and from the thin-wall area to the thick-wall area. Through bottom multi-pouring-gate mold filling and top variable-diameter gas outlet needle gas exhausting, splashing is prevented. And step pressurization and pressure maintaining are carried out after mold filling, and a thick-wall area is forcibly fed. During solidification, solidification is formed from bottom to top and from thin to thick. A riser is replaced with pouring gate feeding, precise exhaust and solidification control are combined, the feeding and exhaust problems of riser-free casting are solved, riser cutting and polishing are avoided, and meanwhile it is guaranteed that a casting is compact and high in quality.

The utility model relates to the technical field of welding devices, and discloses a thin-wall copper pipe welding device which comprises a working table, the top of the working table is fixedly connected with a welding frame, the side wall of the working table is fixedly connected with a first servo motor, the output end of the first servo motor is fixedly connected with a first threaded rod, and the output end of the first threaded rod is fixedly connected with a second threaded rod. The outer surface of the first threaded rod is in threaded connection with a moving block, the top of the moving block is fixedly connected with a moving plate, and the side wall of the moving plate is fixedly connected with a second servo motor. According to the pipeline welding part polishing device, through the buffer block, the connecting rod, the stabilizing frame, the reset spring and the polishing block, the stabilizing frame is used for supporting a welding part, meanwhile, the polishing block is used for polishing the welding part of a pipeline, and the situation that workers are injured in the taking process due to the fact that the welding part is inconvenient to polish is avoided; and the working efficiency of the welding device is improved.

According to the thin-wall part machining method and device, the computer storage medium and the terminal, for a first change curve of strain energy and machining deformation in the layer-by-layer cutting process, it is ensured that the machining deformation newly added in the cutting process is smaller than the overall machining deformation by one grade with the strain energy reduced by 0.9 or above relative to the initial value as the criterion, and the machining deformation is reduced by one grade; the interference of newly increased deformation of finish machining on the machining precision is effectively restrained; the second change curve of the machining deformation of the part and the cutting thickness value of the part and the process allowance change curve are only fitted within the initial boundary range, and the curve fitting strength is reduced; the finish machining allowance when the second change curve and the process allowance change curve intersect is determined as the optimal finish machining allowance, and the requirements that the newly-added machining deformation corresponding to the finish machining allowance after cutting of each layer is minimum and the finish machining allowance needs to be larger than the deformation amount of previous machining are met; and data support is provided for improving the distribution quality of the finishing allowance.

The invention belongs to the technical field of sliding bearings and protection thereof, and discloses a metal radial elastic sheath for a ceramic sliding bearing under a high-temperature working condition, and the sheath comprises an inner sheath and an outer sheath; the inner sheath sleeves the periphery of the ceramic bushing, is a thin-wall metal sleeve, and is provided with a plurality of spiral openings in the circumferential direction, so that the inner sheath generates elastic bending when being stressed in the radial direction and disperses stress in the annular range; the outer sheath is sleeved on the periphery of the inner sheath, helical teeth are uniformly distributed on the inner circumferential surface of the outer sheath, and the helical teeth apply centripetal acting force to the inner sheath through radial elastic deformation under assembly and high-temperature working conditions. Through flexible deformation of the spiral opening of the inner sheath and radial elastic pre-tightening fit of the helical teeth of the outer sheath, fastening fit can be maintained when a thermal expansion difference exists between the metal bearing seat and the ceramic bushing, stress concentration of the ceramic bushing is reduced, and the risk of axis drift is reduced.

The invention relates to the technical field of aluminum alloy profile processing, and particularly discloses a super-long thin-wall aluminum alloy profile anti-deformation vertical quenching method which comprises the following steps: S1, determining mechanical parameters, and obtaining the maximum equivalent buckling axial pressure P of a to-be-quenched aluminum alloy profile; s2, determining the maximum constraint length of a single section: further calculating the maximum allowable length of the single constraint section of the to-be-quenched aluminum alloy section; S3, determining a minimum constraint section; S4, carrying out solid solution quenching: equally dividing the to-be-quenched aluminum alloy section according to the minimum constraint section N, and carrying out section marking in the radial direction from the bottom to the top, the adjacent segment marking positions and the top of the sectional material are restrained and fixed; and after fixation, solid solution quenching is carried out, and after solid solution quenching is completed, the profile is taken out. The vertical quenching device is suitable for vertical quenching requirements of various ultra-long thin-wall aluminum alloy profiles with complex sections, and the profiles are effectively prevented from being deformed in the vertical quenching process.

The invention provides a method for acquiring the continuous curvature of a segmented variable cross-section tower drum structure of an offshore wind turbine, and belongs to the technical field of ocean engineering structure monitoring based on computer data processing. Comprising the following steps: acquiring discrete strain data of the inner surface of a measurement point of a segmented tower tube structure in real time; obtaining the discrete curvature data of the inner surface of the tower drum through the strain data and the wall thickness of the measurement point; interpolating the discrete curvature data subsets of the measuring points into an inner surface continuous curvature function; verifying the continuous curvature function of the inner surface according to the check points; deriving a continuous curvature function of the outer surface of the tower drum through the curvature function of the inner surface and the wall thickness; and all the segments are repeated, and a global curvature function of the whole tower structure is constructed. According to the method, the curvature of the outer surface is strictly derived from the continuous curvature of the inner surface, so that approximate errors of a traditional thin-wall beam theory in a segmented variable cross-section, thick-wall or large-deformation scene are fundamentally avoided, and the overall deformation state of the tower drum is more truly restored.

The invention discloses a digital driving method for a full-flow manufacturing process of a high-precision shell casting, which comprises a casting stage, a heat treatment stage and a machining stage, and is characterized in that digital data streams are established among three process links of the casting stage, the heat treatment stage and the machining stage; and the output data of the previous process is used as a process adjustment basis of the subsequent process, so that a datamation-driven closed-loop manufacturing system is formed. The invention provides a set of effective systematic solution for high-precision production of thin-wall shell castings.

The invention discloses a reactor internal CW plate assembly automatic welding system and a welding method thereof.The system comprises a bottom frame system, a rack, a welding mechanism, a welding head and a displacement mechanism, the welding position is adjusted through a bottom frame and the rack, the workpiece posture is adjusted through the displacement mechanism, and precise welding is achieved in cooperation with a double-wire welding gun and a laser locating system; the welding method comprises the steps of workpiece pre-deformation fixing, temporary accessory supporting, welding system three-dimensional calibration, ship type posture adjustment, double-wire symmetrical welding, real-time monitoring and the like. According to the method, through anti-deformation tool pre-bending design, double-wire pulse TIG welding and automatic motion control, welding deformation of the thin-wall component is effectively restrained, the quality consistency of welding seams is improved, the welding period of the welding seams is greatly shortened, the defect rate of the welding seams is reduced to 1.2%, and the requirement for high-precision manufacturing of nuclear-grade components is met.

The invention relates to the technical field of sand mold casting, and particularly discloses a gradient exhaust sand mold for an aluminum alloy thin-walled workpiece and a preparation method thereof.The sand mold comprises a cavity surface layer (with the hardness ranging from 90 HB to 95 HB), a transition layer (with the hardness ranging from 80 HB to 70 HB and a back sand layer (with the hardness ranging from 60 HB to 65 HB) which are arranged from inside to outside, and microporous ceramic exhaust rods (with the diameter ranging from 0.3 mm to 0.8 mm and the distance ranging from 1 mm to 3 mm) are embedded in the cavity surface layer; the exhaust rod is composed of a mullite fiber matrix and a nanometer gamma-AlO coating, the porosity is 40-50%, and the exhaust rod penetrates through the back sand layer to form a directional exhaust network. The preparation method comprises the following steps: mixing sand layer by layer (the cavity layer contains 1.0-1.5% of phenolic resin, and the back sand layer contains 0.4-0.6% of resin and 4-6% of starch); when sand is filled to the position 1-3 mm away from the surface of the cavity, an exhaust rod is implanted (the positioning precision is + / -0.1 mm); gradient compaction is carried out (the high pressure of a cavity is 3.0-4.0 MPa, the vibration of a transition area is 20-30 Hz, and the back sand airflow is 0.1-0.2 MPa); and carrying out microwave curing (2.5 to 3.5 kW, 60 to 120 s). The defects of hot cracks and air holes of the thin-wall part (smaller than or equal to 5 mm) are overcome synchronously, and the casting yield is increased to 95% or above.

The invention belongs to the technical field of aero-engines, and particularly relates to a design method of an air inlet casing thin-wall reinforced structure based on rigidity requirements. The invention relates to a design method of a thin-wall reinforced structure of an air inlet casing based on a rigidity requirement. Comprising the following steps of model establishment, parameter setting, load and boundary determination, topological optimization mathematical model establishment, topological optimization calculation, model reconstruction, structural strength evaluation, manufacturability evaluation and preparation, and preparation of the air inlet casing by adopting a selective laser melting additive manufacturing technology. According to the design method for the thin-wall reinforced structure of the air inlet casing based on the rigidity requirement, the topological optimization structure design method and the additive manufacturing technology are combined, the material utilization rate and the specific rigidity of the air inlet casing are greatly improved, and the light weight level of the whole machine is remarkably improved.