534 results about "Thick wall" patented technology

The invention relates to the technical field of metal forge piece machining, in particular to an irregular metal forge piece heat treatment method and system.The irregular metal forge piece heat treatment method comprises the steps that firstly, temperature compensation partitions are divided according to geometrical characteristics, and stepped preheating is implemented to establish a uniform basic temperature field; then, the heat preservation time of each subarea is independently regulated and controlled in the austenitizing stage, and sufficient transformation of a thick-wall area structure and control over the grain size of a thin-wall area are both considered; in the quenching process, partition strength adjustment is carried out based on a preset cooling map, and cooling parameters are dynamically optimized through real-time feedback; and finally, according to the residual stress distribution, carrying out partition stepped tempering. The heating and cooling uniformity is remarkably improved through partition dynamic temperature management, and the structure difference and thermal stress concentration caused by section sudden change are effectively inhibited; the microstructure is ensured to be uniform and stable through austenitizing control; the hardenability and the deformation resistance are balanced through a differential cooling strategy; and directional reduction of residual stress is achieved through an intelligent tempering mechanism, and the cracking risk is greatly reduced while the comprehensive mechanical property is improved.

The invention discloses a pulsed eddy current detection method and system for a thermal power pipeline with a coating layer, and relates to the technical field of pulsed eddy current nondestructive detection.The pulsed eddy current detection method comprises the steps that pulsed eddy current detection simulation and experiment are conducted under the condition of a three-dimensional simulation model and a test piece, and excitation current waveform, amplitude and frequency parameters are determined; an induced voltage signal is collected, peak values, time points and attenuation characteristics are extracted, the corresponding relation between the wall thickness, the coating layer thickness and the welding seam structure and detection signals is constructed, a parameterized database is constructed, and temperature correction is completed; and optimizing a sensor structure and a signal acquisition scheme according to a parameterized database, obtaining detection data in a pipeline operation state, completing two-dimensional imaging of wall thickness distribution and welding seam positioning, and forming detection information covering a straight pipe, an elbow and a welding seam area. According to the method, wall thickness detection and welding seam positioning of the thermal power pipeline under the conditions of a thick wall and a thick coating layer are achieved through the full-process design of test piece modeling, simulation experiment and imaging collection.

The invention belongs to the technical field of nondestructive testing, and discloses a vector coherence factor-based thick-wall austenitic stainless steel welding seam full-focus imaging method, which comprises the following steps of: acquiring full-matrix data through a TRL area array probe, constructing an imaging area, calculating a spatial relationship, optimizing a propagation path in combination with a Fermat principle, and obtaining a full-focus imaging result; the method comprises the following steps of: firstly, extracting an instantaneous phase of an ultrasonic signal to construct a vector coherence factor, reconstructing an imaging data matrix according to the coherence factor, and obtaining a phase coherence weighted full-focusing imaging result, so as to ensure that each pixel point can obtain an optimal propagation path, thereby generating a full-focusing image data matrix by adopting a point-by-point delay superposition technology; the method can effectively improve the signal-to-noise ratio and positioning and quantification precision of the thick-wall austenitic stainless steel weld joint detection image, and has good engineering application value.

The invention belongs to the field of production control, and particularly discloses a control method of a thick-wall optical product precision injection molding hot runner system, which comprises the following steps of: acquiring mold geometric data of local thickness distribution in a mold-containing cavity along a melt flowing direction, calculating theoretical cooling time constants of each region by combining material thermophysical parameters, and calculating the cooling time constant of each region; establishing a thickness-cooling rate mapping relation model; predicting the time when the melt reaches each area and the effective cooling time according to an injection time sequence; solving a temperature compensation value of a heating area corresponding to the hot runner by taking the minimum final temperature variance when the key area is ejected as a target; and finally, dynamically applying a compensation value according to a time sequence before the melt arrives, and withdrawing / adjusting after region filling is completed or a pressure maintaining stage is entered. The invention can balance the temperature field of the mold cavity, reduce the refractive index gradient and shrinkage defect, improve the optical performance and yield of the product, and is suitable for precise injection molding of the thick-wall optical product.

The invention discloses a production method of thick-wall pipeline steel X65MS for polar regions, which adopts ultra-low carbon and high Ni + casting blank secondary cogging extreme cooling + steel plate online ultrafast cooling, breaks the component design of the conventional pipeline steel standard, solves the problem of poor drop hammer low-temperature toughness of thick-wall acid-resistant pipeline steel at-55 DEG C, and has the transverse and longitudinal yield strength of 460-560MPa, the tensile strength of 590-650MPa, the yield ratio of less than or equal to 0.80, the tensile strength of 590-650MPa and the tensile strength of less than or equal to 0.80. The uniform elongation is 10%-12%, the impact value at-55 DEG C is 400-500 J, and the drop weight at-55 DEG C is 90%-95%; when the product is soaked in an NACE solution for 96 hours in an HIC test, CLR, CTR and CSR are all 0; sSC test: four-point bending constant load nominal yield is 90%, and the sample is soaked for 720 hours, and the surface of the sample has no crack; the CTOD value of the crack tip opening displacement of the CTOD test material at-55 DEG C is greater than or equal to 0.6 mm.

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 relates to the technical field of plastic injection molding, in particular to a multi-point glue feeding method for a thick-wall light-emitting body of an automobile tail lamp and an injection molding mold, and the method comprises the steps that product parameters are obtained in response to a detection signal, and a correlation coefficient, a guide angle and a reference track are determined according to the product parameters; injecting the magnetic ball and the detection liquid from a pouring gate position at a guide angle based on a track control method, and collecting a moving track; when the moving track does not coincide with the reference track, an adjusting coefficient is determined according to the moving track and the reference track, and the guide angle is corrected; when the moving track coincides with the reference track, defining the guide angle as a target angle; the injection molding angle is determined according to the target angle and the correlation coefficient, molten plastic is injected from the sprue position, and then a connection image of the product is collected; and the injection molding angle is corrected according to the existence condition of the cross color feature in the connection image. The device has the effect of avoiding color crossing of two materials in a product.

The invention discloses a weldless integral high-strength feeding drill rod and a preparation method thereof. The drill rod comprises a female connector, an elevator groove, a thick-wall slip clamping section, a drill rod pipe body and a male connector which are integrally formed and have the same inner diameter. The drill rod is manufactured by integrally machining a solid bar or a thick-wall pipe body. The yield strength of the drill rod pipe body, the yield strength of the thick-wall slip clamping section and the yield strength of the elevator groove are 135 ksi-180 ksi, and the yield strength of the male connector and the yield strength of the female connector are 130 ksi-150 ksi; the outer diameter of the thick-wall slip clamping section is larger than that of the drill rod pipe body; the outer diameter of the elevator groove is smaller than that of the clamping section of the thick-wall slip; the outer diameter of the elevator groove is not smaller than that of the drill rod pipe body. The outer diameter of the connector does not need to be obviously increased, meanwhile, enough elevator lifting capacity is guaranteed, and the problem of poor structure performance caused by friction welding seams and welding area heat treatment is avoided. Complicated welding, postweld heat treatment and other procedures are omitted, the possibility that a weld joint serves as a performance weak link is avoided, higher comprehensive tensile mechanical performance is achieved, and the method is suitable for well drilling application of extra-deep wells, ocean deep wells and the like.

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 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 provides low-temperature cast steel for polar ships and a heat treatment process of the low-temperature cast steel. The cast steel comprises the following chemical components in percentage by weight: 0.03-0.07% of C, 0.10-0.20% of Si, 1.3-1.5% of Mn, 3.0-4.0% of Ni, 0.80-1.00% of Al, 1.5-2.5% of Cu, not more than 0.05% of Cr and Mo, not more than 0.015% of S, not more than 0.020% of P and the balance of Fe and inevitable impurities. The cast steel has the advantages of ultra-large wall thickness, high strength, low-temperature high toughness, weldability, corrosion resistance and the like, and can meet the building requirements of polar region ship stem columns.

The invention belongs to the technical field of building construction, and provides a super-thick wall concrete crack control method, which comprises the following steps: acquiring a wall three-dimensional solid model, dividing the wall three-dimensional solid model into grid units to obtain a finite element model, monitoring the pressure of a heat dissipation steel pipe by using a pressure sensor network, and judging whether the bond stress of concrete to the steel pipe is abnormal or not; if the grid units are normal, temperature parameters of the grid units are calculated through a temperature sensor network, whether a cooling circulation system is started or not is judged, if yes, temperature control targets of the grid units are simulated and calculated, and prediction time periods are marked for the grid units according to the cooling parameters of the cooling circulation system; constructing a hybrid prediction model to predict the unit temperature of the grid units in the prediction time period to obtain a predicted unit temperature sequence of each grid unit, dynamically calculating an adjustment value of the cooling parameter through a PID algorithm, and performing feedback iterative calculation according to the adjustment value to obtain an actual adjustment value of each cooling parameter; and the cooling parameter is adjusted according to the actual adjustment value.

This invention provides a method for producing small-diameter, thick-walled near-α-type titanium alloy tubing and its application. This method, through the use of cladding and heated rolling, increases the deformation per rolling pass, reduces the number of rolling passes, and results in a finer microstructure and better mechanical properties in the heated-rolled tubing. Simultaneously, the composite material composed of the cladding layer and silica aerogel effectively prevents the alloy rod from contacting air, avoiding further surface oxidation and reducing the thickness of the oxide layer on the rod surface. Furthermore, the composite material forms a "thermal insulation layer" on the surface of the alloy rod, preventing large temperature differences between the surface and core during heated rolling, thus ensuring better microstructure uniformity and surface quality. In this invention, the cladding process expands the selection of heating furnaces and reduces equipment requirements.

The invention relates to an outer cylinder prestress reinforced composite material pipe and a design method thereof, and belongs to the technical field of fluid conveying pressure pipelines. The pipeline comprises an outer cylinder, a middle steel cylinder and a concrete inner cylinder, the pipe diameter is 1600-5000 mm, the outer cylinder is composed of a composite material formed by mixing multiple layers of annularly-wound glass fibers and epoxy resin and is prestressed, the glass fibers account for 50%-70% of the volume of the outer cylinder, the equivalent elastic modulus, the Poisson's ratio and the tensile strength are calculated, mechanical analysis of the composite material is simplified, and the tensile strength of the composite material is improved. The middle steel cylinder is configured as a supporting layer, and the concrete inner cylinder is configured as a pressure-resistant and fluid channel. Based on the thick-wall cylinder theory, the prestress of the outer cylinder enables the concrete inner cylinder to be pressed in advance, the internal pressure tensile stress is counteracted, and the cracking risk is reduced. Under regulation and control of prestress, the outer cylinder bears main circumferential tension, tension of the middle steel cylinder is reduced, and cooperative bearing is achieved. The composite pipe has high strength, light weight and corrosion resistance, the problems that a traditional pipe is prone to cracking, high in steel consumption and short in service life are solved, and safety, durability and economical efficiency are remarkably improved.

The invention relates to the technical field of silica gel injection molding temperature control, in particular to a temperature control system and process for liquid injection molding of a silica gel toy. The process comprises the following steps: S1, according to three-dimensional model data of a silica gel toy, automatically identifying geometric feature information of the silica gel toy; s2, setting initial temperature parameters of each injection molding stage on the basis of the geometrical characteristic information in combination with physical characteristics of the liquid silica gel; s3, in the injection period, based on the initial temperature parameters, micro-heating / mold temperature maintaining / micro-cooling is conducted on different areas of the silica gel toy; s4, in the pressure maintaining period, when the liquid silica gel is filled to the preset filling proportion, the mold temperature of the multicolor injection molding material flow interface area is reduced to the freezing temperature; s5, in the main vulcanization period, a self-adaptive temperature adjustment strategy is executed on the thick-wall area and the thin-wall area; and S6, in the cooling and demolding period, a corresponding rapid cooling strategy / slow cooling strategy is executed on the thick-wall area and the thin-wall area. The size stability and the assembly precision of the complex thin-wall silica gel component are remarkably improved.

The invention belongs to the technical field of metal pipe fitting cutting equipment, and particularly relates to a metal pipe fitting cutting machining device which comprises a base, a fixed tool rest, a rotating tool rest, a cutting assembly and a detecting assembly, the fixed tool rest is provided with an annular sliding rail with an opening, and the rotating tool rest is in sliding fit with the sliding rail through a sliding block and can rotate around a pipe fitting; the cutting assembly is installed on the rotating tool rest through a sliding support, feeding of the cutting assembly is controlled by a motor driving lead screw, and the detection assembly detects the cutting depth in real time through spring pressing and a travel switch. Through linkage of detection feedback and a control system, the thick-wall pipe fitting can be automatically cut in a layered mode according to the set thickness, the cutting efficiency and the machining precision are greatly improved, the cutting resistance is effectively reduced, the cutter collision accident is fundamentally prevented, and the machining safety and the service life of a cutter are guaranteed.

The invention discloses a method for refining and homogenizing crystal grains of a 9%-12% Cr steel thick-wall large forge piece, and belongs to the field of ferrous metallurgy. According to the method, the large forge piece is heated to be close to the critical point of the complete austenitizing temperature in a stepped mode, the large forge piece is subjected to heat treatment by regulating and controlling dispersive precipitation of carbides in an initial structure and uniform nucleation of austenite and / or introducing a small amount of undissolved ferrite, residual precipitated phases and multi-phase interfaces and controlling the cooling speed; nucleation particles of pearlite transformation in the vibration heat preservation process are remarkably increased, uniform distribution of granular pearlite in the supercooled austenite is promoted, structural inheritance is cut off and eliminated, and the purpose of grain refining and homogenizing after performance heat treatment is achieved. According to the method, the grains of the thick-wall large forge piece are refined to 5 grades or above, the cross section grain size difference is within 2 grades, a series of problems that in the production process, grass waves exist in ultrasonic flaw detection, the grain size is unqualified, and the low-temperature impact toughness does not reach the standard can be solved, the product percent of pass and the production efficiency are remarkably improved, and meanwhile the production energy consumption is reduced.

The anti-deformation casting technology comprises the following steps that S1, a mold is pretreated, specifically, a, a thick-wall area and a thin-wall area are recognized according to a casting three-dimensional model, and a high-heat-conduction material insert is embedded into the mold corresponding to the thick-wall area; a low-heat-conduction material insert is embedded into the mold corresponding to the thin-wall area; b, a casting mold is preheated to 180-250 DEG C, and an anti-burnt-on sand coating is evenly sprayed on the inner surface of the mold; s2, low-pressure mold filling pouring is conducted, specifically, molten metal liquid is injected into a mold in a low-pressure mold filling mode; s3, solidification and vibration aging treatment, wherein the thick-wall area of the casting is solidified to 50%-70%; and S4, demolding treatment is conducted, specifically, the casting is demolded, and the casting is transferred into an argon protection heat preservation furnace after demolding. Through the synergistic effect of differential cooling control, stepped pressurization solidification and directional vibration aging, micro plastic deformation can occur in the casting, residual stress is homogenized, the dimensional stability of the gray iron casting is further improved, and deformation of the gray iron casting is reduced.

The invention relates to the technical field of steel pipe machining, in particular to a thick-wall steel pipe machining device of a laser cutting integrated structure. The thick-wall steel pipe machining device comprises a main rack, a rotating assembly is arranged at the position, close to the middle, of the top of the main rack, and a bearing assembly is arranged at the position, close to one end, of the top of the main rack; a laser cutting assembly is arranged at the top of the main rack and located between the rotating assembly and the bearing assembly, and a cleaning unit is arranged at the position, below the laser cutting assembly, of the top of the main rack. The cleaning unit comprises a shell in sliding connection with the main machine frame, a mounting cavity is formed in the top end of the shell, a driving wheel is rotationally connected into the mounting cavity, and butt joint discs are arranged at the positions, located on the two sides of the driving wheel, in the mounting cavity. The continuity is improved through integration of cutting, separating and deburring, double-end machining is achieved through double-end synchronous reverse driving and independent triggering rotation, the butt joint assembly and the cutter assembly are in linkage to be matched with steel pipes of multiple specifications, and the deburring precision is guaranteed.

The invention relates to the technical field of pipe preparation, and particularly provides a small-caliber high-precision thin-wall GH738 pipe preparation method which comprises the following steps: step 1, obtaining a GH738 bar blank; secondly, the bar is machined into a GH738 pipe blank; 3, a semi-finished product GH738 pipe is obtained; 4, after the semi-finished GH738 pipe is cleaned, a finished product vacuum heat treatment procedure is conducted, and the structure and performance of the pipe are adjusted; step 5, rounding and straightening pretreatment; and 6, the small-size high-precision thin-wall GH738 pipe is obtained. The outer diameter is 5-8 mm, the outer diameter tolerance is-0.01--0.03 mm, the wall thickness is 0.5-1.0 mm, the wall thickness tolerance is + / -0.05 mm, and the straightness is smaller than 0.3 mm / m. The method has the advantages that the prepared small-size high-precision thin-wall GH738 pipe is higher in size precision, better in straightness, lower in surface residual stress and higher in eddy current flaw detection qualification rate, and the pipe yield is remarkably increased. And the preparation process is simple, has strong repeatability, is suitable for industrial large-scale production, and has wide popularization value and remarkable economic benefits.

The invention discloses a process for preparing a high-strength aluminum alloy profile through gradient cooling die-electromagnetic vibration combined extrusion, and belongs to the technical field of aluminum alloy machining. According to the technology, the uniform fine grain structure and high performance of the aluminum alloy profile are achieved through the design of the length of a die working tape and the flow gradient of a cooling channel in cooperation with an electromagnetic vibration device. After a blank is subjected to homogenization treatment, the blank is extruded through a gradient cooling die, a thin-wall area working zone is 20-25 mm, the cooling water flow is 15-20 L / min, a thick-wall area working zone is 10-15 mm, the cooling water flow is 5-10 L / min, 20-50 Hz electromagnetic vibration is applied at the same time, water mist quenching and aging treatment are conducted immediately after extrusion, zinc ions serve as heterogeneous nucleation cores to promote generation of new crystal grains, ferrocene sulfenyl is adsorbed to the surfaces of the crystal grains to inhibit growth, and the thickness of the crystal grains is 10-15 mm. The average grain size is refined, and the effect is improved.

The invention provides a production method and application of a small-diameter thick-wall near-alpha type titanium alloy pipe. According to the method, the deformation of rolling passes can be increased and the number of times of rolling can be reduced by adopting coating strip temperature rolling, and the strip temperature rolled pipe is fully refined in structure and better in mechanical property. Meanwhile, a multi-layer material composed of the coating layer and the silicon dioxide aerogel can effectively prevent the alloy bar from making contact with air, further surface oxidation is avoided, and the thickness of an oxidation layer on the surface of the bar is reduced. In addition, a heat preservation layer can be formed on the surface of the alloy bar through the multi-layer material, large temperature difference cracking of the surface and the core of the bar is avoided during rolling with temperature, and therefore it is guaranteed that the structure uniformity of the bar is better, and the surface quality is better. In the invention, after the alloy bar is coated, the selection of a heating furnace is expanded, and the use requirement of equipment is reduced.

The invention discloses a TC11 titanium alloy thick-wall pipe diameter forging process parameter optimization method, which relates to the technical field of metal plastic forming process optimization, and comprises the following steps: clearly defining a structure defect problem caused by non-uniform deformation energy in diameter forging of a specific pipe blank and an optimization target; constructing a simulation model to calculate forming sizes and internal deformation energy distribution under different process parameters; training a neural network agent model embedded with a deformation energy uniformity optimization target; using the model to drive a multi-objective optimization algorithm, and automatically searching an optimal process parameter combination; and selecting and outputting a final optimal process parameter from an optimization result. According to the method, the quantitative index reflecting the deformation energy distribution uniformity is embedded into the process optimization model, so that the internal deformation energy distribution of the material can be collaboratively optimized while the macroscopic size is optimized, and the problem that the recessive factor which affects the final structure performance of the component is difficult to effectively evaluate and actively regulate and control in the process design stage in the existing method is solved.

The invention provides a seamless steel tube and a preparation method thereof. The preparation method comprises the steps that S1, raw materials of the seamless steel pipe are sequentially subjected to burdening, smelting, first heating, perforating, rolling, first cooling, second heating and sizing or reducing, and a first steel pipe is obtained; s2, the inner surface of the first steel pipe is subjected to water spraying cooling, and a second steel pipe is obtained; s3, the outer surface of the second steel pipe is atomized and cooled, and a third steel pipe is obtained; and S4, the third steel pipe is subjected to second cooling, and the seamless steel pipe is obtained. By means of the two-stage rapid cooling process of inner surface water spraying cooling and outer surface atomization cooling, the problem that in the cooling process of the ultra-thick-wall hot-rolled seamless steel pipe, the heat storage amount is large; and when a pass-type cooling mode is adopted, the cooling speed is reduced due to temperature return of the inner surface of the seamless steel pipe, so that the seamless steel pipe cannot be quickly and uniformly cooled.

A high-heat-input combined welding method for thick-walled high-strength steel includes following steps. First, a steel plate to be welded is machined into an asymmetric double-sided V-groove, with a depth of a front groove ranging from 30 mm to 40 mm. Then, electrogas welding is used to fill and weld the front groove, with a single-pass heat input controlled below 300 KJ / cm. Finally, a back groove is filled and welded, ensuring that the single-pass heat input for the back groove does not exceed that of the front groove. By adopting an asymmetric double-sided V-groove, the steel plate to be welded is divided into front and back sections. The depth of the groove is restricted to limit the heat input during filling welding.

The invention provides a segmented heat control welding method and system for a dual-phase steel thick-wall component, and relates to the technical field of welding. The method comprises the steps that a segmented unit planning set is constructed; generating a segmented unit multi-source synchronous data set; constructing a welding thermal cycle characteristic parameter set; generating a welding control constraint set; obtaining a segmented heat input deviation instruction set; generating a welding process parameter adjusting instruction; and according to the actual welding seam structure performance in the long-term welding process, a parameter optimization algorithm is adopted to optimize the adjustment process, and continuous updating of the segmented heat control welding model is achieved. The technical problems that in the prior art, heat input control is extensive, temperature field monitoring is not comprehensive, technological parameter adjustment lags behind, and quantitative bases are lacked are solved.

A laying structure of and a laying implementation method for a thick-walled multi-cavity pultruded beam in the shape of a Chinese character "目" for a vehicle body, relating to the technical field of rail transit. The laying structure comprises a first cavity region (1), a second cavity region (2), a third cavity region (3), and an outer skin region (4) that are all formed by laying multi-axial fabrics. The second cavity region (2) is located between the first cavity region (1) and the third cavity region (3), and the first, second and third cavity regions are collectively wrapped by the outer skin region (4) to form a rectangular structure in the shape of the Chinese character "目". In the laying structure of a thick-walled multi-cavity pultruded beam in the shape of the Chinese character "目" for a vehicle body, quasi-isotropic mechanical properties of the thick-walled multi-cavity pultruded beam in the shape of the Chinese character "目" for a vehicle body are achieved by laying multi-axial fabrics; moreover, the laying structure is adapted to a pultrusion process, and optimizes the structural design, improving the overall rigidity and strength.

The invention relates to the technical field of seamless steel tube processing, and provides a processing technology of a high-temperature-resistant seamless steel tube, which comprises the following steps: blank preparation and pretreatment: preparing a stainless steel blank with the Cr content of more than or equal to 10.5% by adopting an electroslag remelting smelting technology, and carrying out high-temperature homogenization diffusion annealing on a cast ingot, and hot working forming is conducted, specifically, the pretreated blank is heated to 1080-1200 DEG C, perforating rolling is conducted through a three-roller skew rolling perforating machine, a thick-wall tubular billet is formed, online temperature control cooling, warm rolling and online solution treatment are conducted after perforating, and warm rolling is conducted on the thick-wall tubular billet within the range of Ac1 to 980 DEG C. By matching the electroslag remelting and high-temperature homogenization diffusion annealing process, element segregation and internal tiny defects of a casting blank are effectively reduced, the structure uniformity and purity of the blank are remarkably improved, the problem of insufficient structure uniformity in an existing process is solved from the source, and a basic guarantee is provided for excellent high-temperature performance and corrosion resistance of a product.

The invention relates to the technical field of pipe manufacturing, and particularly discloses an unequal-wall-thickness cold-rolled seamless pipe and a manufacturing method thereof.The manufacturing method of the unequal-wall-thickness cold-rolled seamless pipe comprises the steps that S100, a seamless round pipe is selected as a pipe blank; s200, wall thickness partition design is conducted in the circumferential direction and the axial direction of the pipe blank, and the specific positions and wall thickness values of a thick-wall area and a thin-wall area are determined; and S300, the pipe blank is loaded into a cold rolling mill, asymmetric cold rolling forming is adopted to enable the pipe blank to form an unequal-wall-thickness structure with two thin-wall areas and two thick-wall areas, the two thin-wall areas and the two thick-wall areas are sequentially connected in the circumferential direction, and the thin-wall areas and the thick-wall areas are alternately arranged. According to the process, through the preset wall thickness distribution design, a single seamless round pipe is directly formed, optimal configuration of materials is achieved, the thick-wall area is planned and formed in the area needing high strength through thickening, the thin-wall area is planned and formed in the non-key area through thinning, unification of light weight and high performance is achieved, and the flexibility of pipe body manufacturing and machining is improved.

This utility model relates to the field of cast iron pot mold technology and discloses a multi-temperature zone circulating preheating heating device for cast iron pot molds. It includes a base, with support columns symmetrically fixedly connected to the top of the base in all directions. A fixed seat is fixedly connected to the top of each of the four support columns. A pressing and heating mechanism is provided on the top of the base. Multi-temperature zone differentiated heating is achieved through a combination of an electromagnetic induction coil and an infrared radiation heating tube. The electromagnetic induction coil is arranged between the bottom of the lower mold base and the inner mold, using the principle of electromagnetic induction to rapidly heat the bottom of the mold, suitable for efficient heating of thick-walled parts of the cast iron pot mold. The infrared radiation heating tube is located between the lower mold base and the inner mold, above the heat insulation ring, and can uniformly radiate heat to the sidewalls of the mold. The combined effect of these two methods significantly shortens the preheating time compared to traditional single heating methods, while simultaneously meeting the temperature requirements of different parts of the mold, effectively improving production efficiency.