154 results about "Natural aging" patented technology

The invention relates to a method for reducing the occurrence rate of rolling edge cracks and strip breakage of high-grade non-oriented silicon steel. The high-grade non-oriented silicon steel comprises the following chemical components in percentage by weight: 0.010%-0.030% of C, 2.0%-3.4% of Si, 0.5%-1.1% of Al, 0.1%-0.6% of Mn, 0.008%-0.012% of P, 0.0005%-0.0010% of S, 0.0005%-0.0030% of N, 0.04%-0.06% of Sn, 0.0050%-0.0075% of Sb (selectively added), less than or equal to 0.004% of Ti and the balance of Fe and impurities. The production process comprises the procedures of ironmaking, steelmaking, continuous casting, hot rolling, normalizing, cold rolling and annealing, wherein the natural aging time after normalizing can be controlled to be less than or equal to 72 hours. According to the method, the Sb element is added into the high-grade non-oriented silicon steel and / or the natural aging time after normalizing is controlled, so that the probability of edge cracking and strip breakage of the strip steel during cold rolling is effectively reduced, and the cold rolling yield is increased.

The invention provides a simulated aging test method for an antifouling coating. The simulated aging test method comprises the following steps: S1, constructing a natural aging performance model of the antifouling coating; s2, constructing an accelerated aging model of the antifouling coating and acquiring an acceleration ratio N of natural aging to accelerated aging; s3, based on an accelerated aging model, acquiring an acceleration period Mi corresponding to a critical threshold R (temporary i) of a copper ion exudation rate, wherein the predicted life Lp (temporary i) of the antifouling coating is equal to Mi * N; and S4, based on a natural aging model, obtaining a predicted copper ion exudation rate R < pre-i > corresponding to the predicted life Lp < pre->, judging whether R < pre-i >-R < critical i > / R < critical i > is less than or equal to 10%, if so, outputting a near threshold R < critical i > and the predicted life Lp < pre-i >, and if not, adjusting the critical threshold of the copper ion exudation rate to R < critical i + 1 > and returning to the step S3. According to the method, the performance failure threshold value of the antifouling coating is taken as a boundary condition, the performance of the antifouling coating is rapidly evaluated, the service life of the antifouling coating is quantitatively predicted, the prediction result is subjected to cooperative cross validation through linkage double models, and the reliability is improved.

The invention belongs to the technical field of steel production, and relates to a method for producing a low-cost high-strength galvanized sheet based on thin-strip cast rolling. After molten steel is subjected to thin-strip continuous casting to obtain a casting strip, the casting strip is rolled into a thin strip in a single pass mode, the thin strip is coiled after being cooled through aerial fog, then hot-dip galvanizing is conducted on a continuous hot-dip galvanizing production line after acid pickling is conducted, the annealing temperature of a galvanizing section is 640-720 DEG C, and then the thin strip is placed at the room temperature for more than 35 days after leveling is conducted. According to the method, supersaturated solid solution of C and N atoms in the thin strip casting and rolling sub-rapid solidification process is fully utilized, the high solid solution state is maintained by combining hot rolling and galvanizing section short-time and low-temperature design, finally, strength jump is driven by means of natural aging after production, and the high-strength galvanized plate with good stamping performance is obtained under a simple C-Si-Mn component system. The problems that the high-strength galvanized plate forming capacity of a traditional high-carbon route is insufficient, and the alloy cost of a low-carbon microalloy route is high are solved, and meanwhile carbon emission in the product production process is greatly reduced.

The invention discloses a preparation method of a low-hardness 6-series aluminum alloy and a low-hardness 6-series aluminum alloy profile. The low-hardness 6-series aluminum alloy profile comprises the following components: 0.45-1.22% of Si; 0.53 to 0.98 percent of Mg; 0.02 to 0.28 percent of Cu; 0.04 to 0.72 percent of Mn; 0.02 to 0.26 percent of Cr; the content of F is 0.22 to 0.54 percent; 0.02 to 0.06 percent of Ti; 0.03 to 0.14 percent of Zn; a single impurity element is less than or equal to 0.05%; and the balance of Al. The preparation method comprises the following steps: heating an extrusion die to 440-480 DEG C; the extruded aluminum bar is heated to 410-440 DEG C; the heated aluminum bar is extruded through the heated extrusion die; all fans including a quenching area and a cooling bed area are closed during extrusion; and the profile is placed on a cooling bed to be naturally cooled, when the temperature of the profile is cooled to be lower than 200 DEG C, a cooling bed fan is started till the temperature is reduced to the room temperature, and preparation of the 6-series aluminum alloy profile is completed. The invention provides the low-hardness 6-series aluminum alloy without a natural aging effect, and the subsequent cold machining such as stretch bending of an aluminum profile is facilitated through the low hardness.

The invention belongs to the field of indoor environment health research, and particularly relates to a method for effectively representing a volatile organic compound (VOCs) release mechanism of an indoor material under long-term physical and chemical action. According to the method, accurate and effective characterization of the long-term release characteristic of the material is realized by simplifying a complex physical and chemical coupling problem and combining an aging test and a parameter determination experiment. The method comprises the following steps: designing a natural aging experiment to simulate an actual long-term release process of a material; extracting material samples with different aging times, and determining corresponding VOCs key parameters by utilizing an environment chamber experiment; and fitting the change of the key parameters along with time by using a single exponential function so as to characterize the long-term release characteristic of the VOCs in the material. The method is suitable for material-VOCs combined release research under different temperature and humidity conditions, and results can be used for long-term concentration prediction of indoor VOCs in a dynamic environment and further applied to reasonable material selection in building design, ventilation design in specific space and time, health risk assessment and the like.

The utility model discloses a detachable forest industrial product aging test box integrating temperature, humidity and light regulation and control, and belongs to the technical field of environment simulation equipment for product tests. Comprising an aging oven, and further comprises a temperature regulation and control unit, a humidity regulation and control unit and an illumination regulation and control unit which are installed in an inner cavity of the aging oven, and a console installed on one side of the aging oven, and the temperature regulation and control unit, the humidity regulation and control unit and the illumination regulation and control unit are electrically connected with the console; the aging test box provided by the utility model is specially used for the forest-work product, the internal sample table is detachable and rotatable, a plurality of environmental variables of the inner cavity of the box body can be controlled, the natural aging condition of the forest-work product can be simulated more truly, the efficiency is improved, and the data accuracy is increased.

The invention provides a heat treatment-free aluminum alloy casting production process, and belongs to the technical field of alloys, and the heat treatment-free aluminum alloy casting production process comprises the following steps: S1, alloy preparation; s2, smelting and refining are conducted, after pure aluminum ingots are molten, heating and mixing are conducted, powder spraying refining and degassing treatment are conducted, and the dosage of a refining agent accounts for 0.1%-0.3% of the mass of molten liquid; s3, die-casting forming is conducted, specifically, a high-vacuum die-casting process is adopted, the injection pressure is 80-150 MPa, the melt pouring temperature is 680-720 DEG C, and the die preheating temperature is 150-250 DEG C; s4, natural aging treatment; the specific parameters of the adding amount of a refining agent, the injection pressure and the pouring temperature are optimized through a three-factor three-level orthogonal test, the optimal machining process parameters are determined to be 0.20% of the refining agent, 120 MPa of the injection pressure and 700 DEG C of the pouring temperature by detecting the tensile strength, the ductility and the hardness of the alloy, at the moment, the tensile strength of the alloy is improved to 389 MPa, the ductility is improved to 8.5%, and the hardness is improved to HV65.8; and compared with the alloy before optimization, the alloy is increased by 9.0%, 26.8% and 2.3% respectively.

The invention belongs to the field of heat treatment numerical simulation of aluminum alloy large forgings, and discloses a method for predicting the influence of natural aging on cold pressing loads and stress fields of aluminum alloy forgings. According to the method, the influence of different natural aging times is introduced into the cold pressing deformation behavior prediction model of the aluminum alloy forging, so that the cold deformation behaviors of the 7xxx series aluminum alloy under different natural aging times can be accurately predicted; on the basis, prediction of load and stress field evolution of the aviation die forgings treated by different natural aging times in the cold pressing production process is achieved, and guidance is provided for optimizing the production technology and procedure of the 7xxx series aluminum alloy large aviation die forgings.

The invention discloses a precise hole lug piece and a manufacturing method of a high-edge-strip titanium alloy rib part, and relates to the technical field of forging. According to the specific technical scheme disclosed by the invention, the method comprises the steps of reaming a process hole, clamping a high-edge strip surface, roughly machining a part lug surface, roughly machining the part high-edge strip surface, naturally aging, semi-finishing the part lug surface, finishing the part lug surface, reaming a side wall precision hole of the part lug surface, semi-finishing the part high-edge strip surface, and finishing the part high-edge strip surface. And measuring the size of the part, and removing the process patch and the patch on the two sides. The machining method effectively solves the problem of machining precision holes in the side walls of the lug pieces of the parts, the problem of vibration of the high-edge-strip parts in the machining process and the problem of residual closed angles of the parts, meanwhile, deformation of the parts in the machining process can be controlled, and then the size and precision of the parts are guaranteed.

The invention belongs to the field of wrought aluminum alloy regeneration and recovery, and discloses a method for regulating and controlling the structure and performance of a high-Fe-content 6016 regenerated aluminum alloy. The method comprises the following steps: 1) melting a 6016 aluminum alloy with high Fe content, adding a Cr-containing intermediate alloy, uniformly mixing, standing, and adding Sn to obtain a microalloyed melt; (2) the melt passes through a snake-shaped pouring gate and then enters a mold, and casting is conducted to form a cast ingot; and (3) the cast ingot is subjected to homogenizing annealing treatment, air cooling is conducted after hot rolling, then cold rolling, high-temperature solid solution treatment, cooling, natural aging and artificial aging treatment are conducted, and the regenerated aluminum alloy is obtained. According to the method, primary alpha-Al grains in the 6016 regenerated alloy are efficiently refined, the roundness is improved, and the Fe-rich phase form is effectively modified into a small Chinese character shape from a thick long needle shape. The prepared regenerated aluminum alloy is excellent in mechanical property, the harm of the impurity element Fe to the 6016 regenerated aluminum alloy is remarkably reduced, and high-quality utilization of the regenerated aluminum alloy is achieved.

The invention discloses a thermomechanical treatment method for improving the obdurability and the plate shape of an Al-Cu-Mg alloy plate. The thermomechanical treatment method comprises the following steps: (1) carrying out pre-stretching treatment on a deformed plate; (2) carrying out single-stage or graded solid solution heat treatment on the pre-stretched plate, wherein the final solid solution heat treatment temperature is T1; (3) cooling the plate subjected to solid solution treatment to a temperature T2 at an average cooling rate V1, and then cooling the plate from T2 to a room temperature at an average cooling rate V2; (4) the quenched plate is subjected to cold deformation treatment after being placed at the room temperature; and (5) the plate subjected to cold deformation treatment is subjected to pre-stretching treatment, and then natural aging is conducted under the room temperature condition. According to the method, the Al-Cu-Mg alloy plate is subjected to pre-stretching, solid solution heat preservation, graded controlled cooling quenching, room temperature standing, cold deformation, pre-stretching and natural aging treatment, and the Al-Cu-Mg alloy can obtain an ideal obdurability matching relation on the premise of controlling residual stress and the plate shape.

The invention discloses a submarine cable insulating material comprehensive aging evaluation method and system based on a time scaling equivalent axis, and relates to the technical field of submarine cable insulating material aging evaluation. The method aims at solving the problems that equivalent alignment of acceleration and natural aging data cannot be achieved, multi-index evaluation is contradictory, and the evaluation period is long in an existing method. The method comprises the following steps: acquiring a plurality of preset performance parameters of a submarine cable insulation material after an electric-thermal-force multi-physical field accelerated aging test, synthesizing a comprehensive aging index after homodromous mapping and robust standardization processing, establishing equivalent mapping of accelerated and natural service time through a linear scaling coefficient, and calculating the aging index of the submarine cable insulation material according to the equivalent mapping. And a service life evaluation result or reliability warning information is output after consistency checking. According to the technical scheme, the aging state and the service life of the submarine cable insulating material can be accurately and efficiently evaluated, and support is provided for material screening, service life evaluation and safety decision making of submarine cable engineering.

The invention relates to an aluminum alloy welding material and a high-toughness welding seam preparation method, and belongs to the technical field of welding. According to the aluminum alloy welding material, cold metal transition, pulse hybrid welding, laser welding and other welding technologies are combined for rapid cooling, so that Mg, Cu, Zn and other elements in a weld joint are subjected to complete solid solution and are in a supersaturated state, and the joint strength mainly comes from solid solution strengthening contribution of Mg, Cu, Zn and other alloy elements and precipitation strengthening contribution of a corresponding strengthening phase; and then a solute-vacancy coupling diffusion mechanism can be achieved through short-time natural aging, a high-density strengthening phase is rapidly separated out from the welding seam, and therefore the welding seam is strengthened and toughened, and the welding seam strength and the welding coefficient are remarkably improved. Therefore, manual aging intervention is avoided, the welding cost is reduced, and the welding efficiency is improved.

The present invention relates to an aluminum alloy welding material and a method for preparing a high-strength and tough weld, belonging to the field of welding technology. The aluminum alloy welding material of the present invention combines welding technologies such as cold metal transfer and pulse composite welding, laser welding, etc. with rapid cooling, so that elements such as Mg, Cu, and Zn in the weld are completely solid-solved and in a supersaturated state. The joint strength mainly comes from the solid-solution strengthening contribution of alloy elements such as Mg, Cu, and Zn and the precipitation strengthening contribution of the corresponding strengthening phases; then, through short-term natural aging, the solute-vacancy coupling diffusion mechanism can be realized, promoting the rapid precipitation of high-density strengthening phases in the weld, thereby realizing the strengthening and toughening of the weld, and significantly improving the weld strength and welding coefficient. Thus, the intervention of artificial aging is avoided, the welding cost is reduced, and the welding efficiency is improved.

The invention discloses a method for rescuing and reusing a 6-series aluminum alloy natural aging expired material for an automobile sheet, which comprises the following steps: 1) solid solution heat treatment at the temperature of 520-535 DEG C; 2) pre-aging heat treatment, wherein the pre-aging heat treatment temperature is 70-85 DEG C; according to the method disclosed by the invention, the 6-series aluminum alloy which is naturally stored for more than 6 months or has poor performance and cannot meet the stamping requirement when the yield strength is increased by more than 40MPa compared with the original yield strength can obtain high formability again, and the material performance reduction caused by aging is avoided, so that the 6-series aluminum alloy can be put into use again.

The invention discloses a machining method for nickel plating of aviation titanium alloy parts, and belongs to the technical field of part machining. The method comprises the following steps: roughly machining a titanium alloy part raw material; the stress of the part is eliminated through vacuum heat treatment or natural aging; the titanium alloy part is subjected to semi-finish machining; the stress of the part is eliminated through vacuum heat treatment or natural aging; the titanium alloy part is machined to a state required by a drawing; performing corresponding flaw detection on the titanium alloy part according to drawing requirements; the titanium alloy part is subjected to chemical nickel plating according to drawing requirements; the titanium alloy part is manually polished and repaired; the titanium alloy part is subjected to size inspection, and it is guaranteed that the titanium alloy part meets the drawing requirement. Under the condition that the material performance of the part is guaranteed, internal stress generated by machining is eliminated, stress deformation in the nickel plating process is reduced, and it is guaranteed that the size is qualified after nickel plating; and the machining mode of polishing and repairing the nickel plating layer is defined, and the dimensional precision and performance requirements of the part after nickel plating are ensured.

The invention relates to the technical field of injection molding metal-polymer joint aging performance prediction, and particularly discloses an injection molding metal-polymer joint hygrothermal aging strength prediction method based on an Informer-SENet model. Aiming at the problem that a pure data driving model is insufficient in generalization ability under a small sample, an improved Informer-SENet prediction network is constructed by fusing the long sequence modeling ability of an Informer model and a feature channel re-calibration mechanism of SENet, the metal-polymer joint strength prediction precision can be remarkably improved, and the prediction accuracy of the metal-polymer joint strength is improved. The prediction precision of the method is much higher than that of existing traditional machine learning and deep learning methods. In addition, an improved secretary bird optimization algorithm (ISBOA) is adopted, and the global search capability is improved. The invention provides a new method for predicting the natural aging strength degradation data by utilizing the joint hygrothermal aging strength degradation data based on the deep learning model, so that the experiment cost is remarkably reduced, and more reliable technical support is provided for industrial application.

The invention belongs to the technical field of surface modification, and particularly relates to a super-hydrophobic insulating coating with a surface microstructure and a preparation method and application of the super-hydrophobic insulating coating. The defects of poor environmental stability, low regulation and control precision, insulation performance attenuation and the like in the prior art are overcome, the static contact angle of the disclosed super-hydrophobic insulation coating is larger than or equal to 150 degrees, the rolling angle is smaller than or equal to 5 degrees, meanwhile, the insulation strength is larger than or equal to 90% of that of an original substrate (the breakdown field strength is larger than or equal to 20 kV / mm), and collaborative optimization of the super-hydrophobic performance and the insulation performance is achieved; moreover, after the coating is naturally aged outdoors for 3 years, the contact angle change rate is smaller than or equal to 10%, the insulation strength attenuation rate is smaller than or equal to 8%, and the long-term environmental stability of the super-hydrophobic insulating coating is effectively improved. A precise regulation and control mechanism is also established based on a molecular dynamics simulation-based low-droplet adhesion microstructure insulation surface design method, so that the droplet contact time is reduced by more than 60% compared with a flat surface, the instantaneous leakage current is reduced by 40%-60%, and the method not only adapts to a polluted environment with the temperature range of-40 DEG C to 180 DEG C and the salt mist concentration of less than or equal to 0.5 mg / m, but also meets the preparation requirements of power equipment with complex shapes.

The invention belongs to the technical field of aluminum alloy materials, and particularly relates to a low-natural-aging and high-formability aluminum-magnesium-silicon alloy, a preparation method and application thereof.The low-natural-aging and high-formability aluminum-magnesium-silicon alloy is prepared from, by weight, 1.0%-1.8% of Mg, 0.6%-1.5% of Si, 0.1%-0.35% of Cu, 1.0%-1.5% of Sn, 0.05%-0.15% of Ti and the balance Al, and the Sn / Mg ratio is 0.8-1.2. According to the low-natural-aging and high-formability aluminum-magnesium-silicon alloy, natural aging can be obviously inhibited, alloy recrystallization grains can be refined, meanwhile, the forming capacity of the Al-Mg-Si alloy is improved, and the forming performance of the Al-Mg-Si alloy is improved. The material is suitable for being used as automobile inner and outer plates and structural parts, and low-cost industrial production can be achieved.

The application discloses a method for evaluating the protection effect of a coating on a marine concrete structure, and the method comprises the following steps: testing the chloride ion content in the target surface coating concrete; establishing the relationship between the coating chloride ion diffusion coefficient ratio and the natural aging time under the environment of the engineering concrete based on the chloride ion content, the ultraviolet cumulative radiation of the environment where the engineering concrete is located, and the ultraviolet cumulative radiation accepted by the target surface coating concrete during the aging process; obtaining the time when the chloride ion in the engineering concrete diffuses to the surface of the concrete under the environment of the engineering concrete according to the initial coating chloride ion diffusion coefficient, the coating thickness and the fitting constant; and determining the protection effect of the coating on the engineering concrete according to the time when the chloride ion in the engineering concrete diffuses to the surface of the concrete. Therefore, the protection effect of the coating on the concrete structure can be more accurately judged, and the method can be widely applied to the field of evaluating the protection effect of the coating on the concrete structure.

The invention discloses a thermomechanical treatment method of a 2XXX series aluminum alloy. The method comprises the following steps: placing an alloy in a heating furnace for solution treatment; the alloy is immediately subjected to water quenching to 20-25 DEG C after being discharged from the furnace, and the quenching time is less than 15 seconds; after quenching, naturally aging the alloy at room temperature for 12 hours; the alloy subjected to natural aging is placed in a heating furnace to be heated to 175 + / -10 DEG C, taken out of the heating furnace and extruded in a Bc mode for four passes; and naturally cooling the extruded alloy in air. According to the 2XXX series aluminum alloy obtained through the method, the tensile strength can reach 490 MPa, the yield strength can reach 410 MPa, the hardness can reach 171 HV, and the mechanical property is obviously improved compared with the mechanical property obtained after artificial aging. The high-temperature ECAP technology is adopted, the situation that the aluminum-copper alloy is prone to breakage during normal-temperature extrusion is avoided, the method is suitable for machining treatment of small workpieces, and the mechanical property of the alloy is effectively improved.

The invention relates to the field of medical instruments, in particular to a PTFE etching pipe with a bonding layer, a multi-layer composite pipe and a preparation method of the multi-layer composite pipe. The PTFE etching pipe with the bonding layer sequentially comprises a PTFE base pipe, an etching layer and the bonding layer from inside to outside, the bonding layer is made of polyether block polyamide, polyamide, thermoplastic acrylic resin, silicone rubber or thermoplastic polyurethane elastomer, and the multi-layer composite pipe comprises the PTFE etching pipe with the bonding layer, a middle metal layer and an outer resin layer from inside to outside. Meanwhile, the invention further provides a preparation method of the PTFE etched pipe with the bonding layer and the multi-layer composite pipe, the bonding layer is additionally arranged to improve the bonding strength of the lining pipe and the outer sleeve and reduce the layering risk, compared with a contrast, the peeling strength is higher and larger than 3.4 kN / m, the composite pipe is not layered after aging for 79 days, the natural aging time is converted to be 3 years, and the composite pipe is not layered after aging for 3 years. The durability and the reliability of the catheter are improved, so that the manufacturing cost and the medical risk are reduced.

This application belongs to the field of virtual art restoration technology, specifically providing a deep learning-based virtual art restoration system. The system primarily analyzes historical images and environmental data of the artifact and restoration materials to train an aging prediction model and simulate long-term appearance changes. By quantitatively comparing the differences and stability of their aging trajectories, it calculates the long-term compatibility score for each restoration material and automatically selects the optimal material to generate the final virtual restoration image. This application effectively solves the problem in existing technologies where it is difficult to predict significant visual differences that may appear between restoration materials and the artifact itself after long-term natural aging, ultimately leading to insufficient durability of the restoration results. It achieves scientific prediction and optimized selection of the long-term visual compatibility of restoration schemes, significantly improving the reliability and stability of restoration results and reducing the risk of restoration failure due to material aging incompatibility.

The invention provides an automobile coating anti-aging performance evaluation method based on a natural aging test, and the method comprises the steps: S101, setting an automobile coating anti-aging performance evaluation index, determining a performance evaluation index weight, and determining a score assignment rule of the evaluation index according to the index weight; s102, the evaluation indexes are checked, measured and tested before the aging test, and the initial state before the test is confirmed; s103, carrying out a natural aging test on the automobile coating; s104, checking, measuring and testing the tested automobile coating, and confirming the aging state after the test; s105, calculating an evaluation index aging value according to a comparison result of the initial state and the aging state; s106, combining inspection, measurement and test results with each evaluation index aging value, and calculating a comprehensive evaluation score; and S107, performing star-level evaluation on the automobile coating, and constructing a coating performance prediction model. The anti-aging performance evaluation scale is provided for the automobile industry, and a direction is pointed out for automobile coating product improvement, quality improvement, material selection, research and development and design.

The present invention discloses a method for preparing a standard sample of the thermal expansion coefficient of a nickel-based high-temperature alloy and a standard sample thereof. The method comprises the following steps: S100, chemical composition design; S200, raw material smelting; S300, forging processing, wherein the high-temperature alloy ingot is forged into several metal round bars of preset sizes; S400, heat treatment, wherein the metal round bars are placed in a vacuum heat treatment furnace and subjected to several cycles of heating, heat preservation, and tempering; S500, natural aging, wherein the metal round bars are placed in a conventional storage room for a preset time or longer; S600, initial uniformity inspection; S700, sample processing, wherein the metal round bars are processed into cylindrical finished samples of preset sizes; and then, each cylindrical finished sample is packaged as an independent unit. The standard sample prepared by the above method can meet the requirements of thermal expansion performance analysis of metal materials and quality control of thermal expansion instruments, filling the gap in the field of relevant standard samples in the field at home and abroad.

The invention discloses an impact-resistant electroplating primer for elastomer plastic balls. The impact-resistant electroplating primer is prepared from the following raw materials in parts by weight: 30-50 parts of modified alkyd resin, 15-25 parts of C9 petroleum resin, 1-5 parts of a drier, 45-55 parts of a solvent and 0.1-1 part of an auxiliary agent. By adopting the combination of the soybean oil modified alkyd resin and the TDI modified alkyd resin, the adhesive force of the primer can be improved, the toughness of the primer is improved, and the durability of the adhesive force of a paint film is improved to a certain extent. The composition of the cobalt iso-octoate drier, the zirconium iso-octoate drier and the manganese iso-octoate drier is adopted, the weight ratio of the cobalt iso-octoate drier to the zirconium iso-octoate drier to the manganese iso-octoate drier is 1: 1: 1, brittleness of a paint film can be improved, and a transparent and bright paint film layer is formed. The coating is applied to balls made of ABS and PS blanks, has good adhesive force and can bear natural aging for one year, and a paint film is not prone to falling off after being impacted.

This invention discloses a method for assessing the long-term heavy metal release risk of biochar based on chemical oxidation simulation. The method includes: first, naturally culturing homologous biochar samples in soil to obtain a baseline value W0 for the target heavy metal release ratio; simultaneously, conducting a standardized accelerated aging experiment with an oxidant solution; and determining the number of aging cycles N required to reach W0 by comparison, thereby establishing a quantitative conversion relationship between "number of aging cycles" and "natural aging time". Then, the same accelerated aging experiment is performed on the biochar to be tested, and the number of experimental cycles is converted into an equivalent natural aging time using the quantitative relationship. A long-term release kinetic prediction model is then fitted and constructed, ultimately achieving rapid and quantitative prediction of the cumulative heavy metal release ratio after a target number of years. This invention provides an efficient and reliable tool for assessing the long-term chemical oxidation stability of biochar.

The invention relates to a motor shell machining method based on numerical control machining, which comprises the following steps: S1, preparing an aluminum block blank and a pre-machined inner cylinder, and carrying out shape milling on the aluminum block blank to form a first shell semi-finished product with a preliminary shape; s2, primary rough machining is carried out on the first shell semi-finished product, so that a second shell semi-finished product with a mounting cavity and a speed reduction cavity is formed; s3, the inner cylinder is assembled into the mounting cavity of the second shell semi-finished product through hot pressing operation, then the inner cylinder is welded into the mounting cavity in a friction stir welding mode, and thus a third shell semi-finished product is obtained; s4, carrying out secondary rough machining on the third shell semi-finished product to obtain a fourth shell semi-finished product; and S5, stress release is conducted on the fourth shell semi-finished product in a natural aging mode, after stress release is completed, finish machining is conducted on the fourth shell semi-finished product, and therefore a shell finished product is obtained. Deformation in the machining process of the shell semi-finished product and the inner cylinder can be effectively reduced, and the machining precision and the assembly precision are effectively improved.

The invention relates to an epoxy resin multi-factor comprehensive aging simulation and test design method, which comprises the following steps: selecting electrical equipment parts with different operating years, establishing an orthogonal experiment table for physicochemical property testing, and performing the physicochemical property testing to obtain macroscopic aging characteristic quantity of each test content; constructing a molecular dynamics model of the cross-linked epoxy resin, introducing a macroscopic aging characteristic quantity to simulate the microstructure change of the epoxy resin in the aging process, and establishing a multi-factor coupling aging model under the comprehensive action of electricity, humidity and heat; adopting molecular dynamics simulation software in the multi-factor coupling aging model to simulate the aging behaviors of the epoxy resin under different aging conditions, and obtaining microscopic aging characteristic quantity; and designing a multi-factor coupled epoxy resin aging test based on the macroscopic aging characteristic quantity and the microcosmic aging characteristic quantity. According to the method, the accelerated aging test closer to actual natural aging can be rapidly and effectively designed, and the aging prediction accuracy of the epoxy resin can be improved.

The invention discloses a method and equipment for predicting yield strength increment of a pipeline, a medium and a product, relates to the technical field of mechanical property testing of materials, and aims to solve the problems of how to predict performance change caused by natural aging in a full life service cycle of the pipeline and how to determine the yield strength increment of the pipeline. The prediction method for the pipeline yield strength increment comprises the steps that service parameters of a target pipeline are obtained, wherein the service parameters comprise the to-be-served time and the to-be-served temperature; the service parameters are mapped into target aging parameters, the target aging parameters comprise target aging time and target aging temperature, and the target aging time is shorter than the to-be-served time; and based on the target aging time and the target aging temperature, the target yield strength increment of the target pipeline at the to-be-served temperature after the to-be-served time is predicted.