793 results about "Stress relief" patented technology

Provided is a method for judging geology of a time-delayed extremely intense rockburst as to deep tunnel engineering. Information about geological structures is recorded according to methods such as geological mapping and advanced geological prediction of the tunnel face. Geometric characteristics of burst craters formed during the rockburst are recorded by utilizing advanced geological drilling and profile scanning technologies in a rockburst-damaged zone. 3D geostress in the rockburst-damaged zone is measured by using a stress relief method or a hydraulic fracturing method to determine the orientation of the maximum principal stress. A 3D numerical calculation model is established based on initial geostress testing results and physical and mechanical parameters of rock and structural discontinuities obtained through on-site geological investigations. By conducting excavation simulations under different combinations of structural discontinuities and performing numerical calculation, the risk of time-delayed extremely intense rockburst disasters at current locations after tunnel excavation is judged.

The utility model discloses an assembly line carrier stress relieving device which comprises a stress rod hinged to the front end of a walking frame in a carrier and a tail rod arranged at the rear end of the carrier, the lower end of the stress rod obliquely stretches out towards the rear lower portion of the carrier, and the lower end of the stress rod serves as a stress part for receiving power for pushing the carrier to advance. The tail rod extends towards the rear side of the walking frame, the tail rod on the front side carrier is used for acting on the stress rod on the rear side carrier, so that the lower end of the stress rod swings between the stress position and the disengaging position, and the disengaging position is higher than the stress position. The upper ends of the stress rods obliquely stretch out towards the upper front portion of the walking frame, a limiting structure is formed at the front end of the frame and used for limiting the stress rods so that the lower ends of the stress rods can be located at stress positions, and the tail rod is used for acting on the upper ends of the stress rods on the rear side carrier. The lower end of the stress rod swings between a stress position and a release position; the width of the tail rod is larger than that of the upper end of the stress rod.

The invention relates to the technical field of material surface engineering, and discloses a plastic surface treatment process to solve the problems that in the prior art, a plastic surface coating is poor in adhesive force and single in function, and a traditional treatment method is not environmentally friendly. The process sequentially comprises the following steps: pre-treating a base material, and obtaining a clean and stress-free base material through ultrasonic cleaning and thermodynamic stress elimination; performing low-temperature plasma surface activation, performing physical bombardment and chemical modification on the plastic surface by utilizing plasma of specific process gas in a vacuum environment, introducing a large number of active functional groups, and remarkably improving the surface energy; and preparing and applying the functional nano coating, namely forming firm covalent bonds by using the coupling agent in a coating solution containing functional nano particles and a coupling agent and the anchor points, so that the chemical coupling of the functional coating and the plastic substrate is realized.

The invention relates to a high-performance non-quenched and tempered steel bar for a fan shaft and a manufacturing method of the high-performance non-quenched and tempered steel bar, and belongs to the field of iron-based alloys. The steel comprises the following chemical components in percentage by weight: 0.37 to 0.43 percent of C, 0.30 to 0.60 percent of Si, 1.20 to 1.70 percent of Mn, less than or equal to 0.025 percent of P, 0.030 to 0.070 percent of S, less than or equal to 0.50 percent of Cr, 0.10 to 0.30 percent of Ni, less than or equal to 0.30 percent of Mo, less than or equal to 0.30 percent of Cu, 0.010 to 0.030 percent of Al, 0.005 to 0.025 percent of Ti, 0.05 to 0.15 percent of V, 0.0100 to 0.0200 percent of N, less than or equal to 0.0002 percent of H, less than or equal to 0.0015 percent of O and the balance of Fe and inevitable impurity elements. The manufacturing process comprises the steps of converter / electric furnace smelting, LF furnace refining, RH / VD furnace vacuum degassing, continuous casting, casting blank reheating, cogging rolling, flame cleaning, intermediate blank finishing, intermediate blank heating, bar rolling, cooling and stress relief tempering. The total cross-section structure of the bar is a ferrite and pearlite structure. The bending degree per meter is smaller than or equal to 0.5 mm, the surface defect depth is smaller than or equal to 0.10 mm, and the internal quality meets the A-level requirement of the GB / T4162 standard.

The invention relates to the technical field of aluminum alloy forging, in particular to a forging process capable of reducing reverse forging coarse grains of 6061 aluminum alloy, which comprises the following steps: acquiring a 6061 aluminum alloy ingot, homogenizing and annealing the 6061 aluminum alloy ingot at 480-520 DEG C for 12-16 hours, cooling to room temperature by water, performing ultrasonic flaw detection, performing turning surface treatment, and alternately forging and pressing in three directions, thereby obtaining the 6061 aluminum alloy. The method comprises the following steps: placing a fine-grain 6061 aluminum alloy forge piece in a graded heating furnace, completing sub-dynamic recrystallization, applying directional pressure stress of 50-80MPa to the 6061 aluminum alloy forge piece, analyzing grain boundary characteristic distribution by adopting an electron back scattering diffraction technology, and obtaining the grain boundary optimized 6061 aluminum alloy forge piece with a discontinuous coarse-grain structure through laser shock strengthening and stress relief annealing. According to the method, the problems that reverse forging coarse grains are caused by uneven strain distribution during forging and pressing, and fine grains and high-density nanoprecipitation cannot be effectively obtained and a grain boundary structure cannot be optimized due to the fact that follow-up forging, heat treatment and stress treatment parameters are difficult to accurately control can be solved.

The embodiment of the invention discloses a stress relief effect evaluation method based on a hydraulic fracturing ground stress test. The stress relief effect evaluation method comprises the following steps: performing ground stress inversion on a to-be-relieved stress area according to hydraulic fracturing ground stress test data to determine an initial stress field; determining a stress concentration area in the excavation process of the stress to-be-relieved area according to the initial stress field; drilling a hole in the stress concentration area, carrying out a first hydraulic fracturing ground stress test in the drilled hole, recording a first pressure time history curve, and calculating the fracture surface stress before relieving; keeping the position of the packer in the first crustal stress test unchanged, continuously performing water injection fracturing, performing the hydraulic fracturing crustal stress test at the original position again, recording a second pressure time-history curve, and calculating the fracture surface stress after the second pressure time-history curve is relieved; and comparing fracture surface stress characteristic changes before and after fracturing, and evaluating the stress relief effect of the stress to-be-relieved area according to the fracture surface stress before and after relieving. The pain point that the stress relieving effect is difficult to quantitatively evaluate in the prior art is effectively solved.

The invention relates to the technical field of titanium alloy investment precision casting, and particularly provides a titanium alloy multistage deep blind hole investment casting method which comprises the following steps: designing an exhaust hole and a slag removal hole; establishing a model; assembling and welding; soaking the surface layer in a vacuum negative pressure environment, continuously vacuumizing, deflating after soaking, taking out the module, and rotating to uniformly control the slurry; preparing a surface layer; performing segmented grouting on the deep blind hole; making a shell from a back layer; roasting and molding; washing and drying; pouring is conducted; shell cleaning and sand blasting; sealing and welding the process holes; and performing stress relief annealing. And a dynamic vacuumizing means is adopted, and a vacuumizing device is always kept in an open state, so that the compactness of a surface layer is improved, and burrs of a casting are reduced. Through vacuum dynamic slurry immersion, segmented grouting and collaborative design of the exhaust hole and the slag removal hole, investment precision casting forming of the high-precision oil pump shell can be supported, the shell manufacturing efficiency of the multi-stage deep blind hole is improved, and the filling defect rate is reduced.

The invention provides a multi-source dynamic disturbance rockburst combined support prevention and control system and method, and relates to the technical field of rockburst disaster prevention and control, the system comprises stress release holes, wave-absorbing grouting holes, energy-absorbing anchor rods and a passive pressure-bearing structure; the stress release holes are formed in a rockburst high-risk area of the tunnel surrounding rock; the wave-absorbing grouting holes are distributed around the rockburst high-risk area in a staggered mode, the wave-absorbing grouting holes are filled with wave-absorbing grouting materials, and a three-dimensional wave-absorbing grouting area is formed; the energy-absorbing anchor rod is arranged in the three-dimensional wave-absorbing grouting area; the passive pressure-bearing structure comprises a quick-setting concrete layer, a concrete layer containing rubber particles, a steel arch and a steel fiber concrete layer, the concrete layer containing rubber particles is arranged behind the reinforcing mesh, the steel arch is arranged behind the concrete layer containing rubber particles, and steel fiber concrete is arranged behind the steel arch. By constructing the pressure relief-wave absorption-energy absorption-passive pressure bearing four-stage combined supporting system, the safety and adaptability of the supporting system for the rockburst high-risk area are remarkably improved.

The invention relates to the technical field of titanium alloy pipe manufacturing, and particularly discloses a preparation method of a titanium alloy thin-walled pipe with superplasticity, comprising the following steps: S110, annealing a titanium alloy bar below a phase transformation point in a vacuum annealing furnace; s120, the annealed bar material is subjected to reciprocating extrusion treatment; s130, the bar subjected to reciprocating extrusion treatment is subjected to forward extrusion to form a pipe blank; s140, the pipe blank is subjected to superplastic bulging treatment; s150, after superplastic bulging is finished, heat preservation is stopped, and inert shielding gas continues to be blown in for cooling to the room temperature; and S160, stress relief annealing is conducted on the thin-walled pipe obtained after superplastic bulging, and the titanium alloy finished pipe with superplasticity is obtained. According to the method, the plasticity of the titanium alloy pipe is remarkably improved through reciprocating extrusion and superplastic bulging, the deformability is improved, meanwhile, the grain size is regulated and controlled, and preparation of the high-performance and high-size-precision thin-wall pipe is achieved.

The invention provides an intelligent temperature control method and system for relieving stress of a glass annealing kiln. The method comprises the following steps: transmitting acoustic surface waves through a distributed sonic sensor to collect stress propagation data in glass, decoupling coupling characteristics of sound velocity and temperature, extracting a relaxation time constant, and generating a stress relaxation rate; performing time difference cross-correlation analysis to construct a stress propagation three-dimensional gradient field, establishing an incidence relation between the relaxation rate and the gradient field, and constructing a mapping strategy of the temperature set value and the relaxation rate according to the incidence relation; generating a dynamic temperature adjusting parameter and converting the dynamic temperature adjusting parameter into a heater power control signal; and dynamically adjusting a stress data feature extraction rule to match a real-time stress state according to the relevance between the gradient field update frequency and the temperature adjustment rate. According to the application, dynamic mutual optimization of the annealing stress elimination efficiency and the kiln temperature setting precision is realized, the glass residual stress is reduced, and the hidden danger of plate explosion is eliminated.

The invention discloses an oxygen-enriched destressing crystal growth method and a crystal growth furnace, and relates to the technical field of crystal growth, and the oxygen-enriched destressing crystal growth method comprises the following steps: step 1, pre-treating a PMNT polycrystal material, and putting the pretreated PMNT polycrystal material into a crucible; 2, pre-flushing the growth furnace and creating an oxygen partial pressure environment; 3, raising the temperature in the growth furnace to melt and homogenize the PMNT polycrystal material in the crucible; step 4, the crucible moves downwards for directional solidification of the crystal, a solid-liquid interface is formed and stably moves upwards, and in the process, a dynamic regulation and control strategy is adopted in the growth furnace to control an oxygen-enriched environment to promote crystal growth, so that the crystal digests growth stress in the growth process, and formation of oxygen vacancies is inhibited; and step 5, after crystal growth is finished, gradient cooling is performed to room temperature in an oxygen-enriched environment, and a crystal ingot is obtained. Oxygen is used as a regulation and control tool, the stress problem caused by oxygen vacancy is physically solved, the color center and performance problems caused by oxygen vacancy are chemically solved, and the crystal growth quality is improved.

The invention relates to the technical field of research and development of low-temperature bolt steel, and discloses a low-temperature impact performance control process for low-temperature bolt steel. Comprising the steps that S1, in the steelmaking refining stage, purity and uniformity control is conducted, S2, casting blank homogenization treatment is conducted, stress relief and structure regulation are conducted, S3, a heat treatment core process is conducted, structure and toughness balance regulation is conducted, and S4, online detection and dynamic feedback are conducted, and performance stability is guaranteed. By accurately controlling the element proportion of carbon (C), silicon (Si), manganese (Mn), chromium (Cr) and molybdenum (Mo) in steel and combining with an optimized heat treatment process (such as 860 DEG C oil quenching and 640-650 DEG C high-temperature tempering, and the heat preservation time is prolonged to 120 minutes or more), the V-shaped notch impact energy of the material in the environment of-101 DEG C stably reaches 35 J or more, the impact energy of part of samples can reach 50 J or more, and the impact energy of the part of samples can reach 50 J or more. The problem that the low-temperature impact performance is insufficient after wire hardening and tempering is thoroughly solved, and it is ensured that the brittle failure resistance of the bolt is remarkably improved in the ultralow-temperature environment.

The utility model provides girth welding equipment integrated with an induction preheating and stress relief mechanism, which relates to the technical field of girth welding and comprises a worktable, a sliding rail is arranged at the top of the worktable, and a driving tailstock and a rotary clamping mechanism are arranged on the rail in a matching manner to realize coaxial clamping of workpieces; the side face of the workbench is slidably connected with a movable supporting table, the top of the workbench is provided with a supporting column and an induction preheating device, the supporting column is adjustably connected with a welding device and a stress relief device, and the welding device, the stress relief device and the movable supporting table synchronously move along with the movable supporting table. During working, a workpiece is firstly clamped and welded after induction preheating, stress is finally relieved in real time, and the rotary clamping mechanism drives the workpiece to rotate. The device integrates multiple functions, solves the problem of process dispersion of traditional equipment, prevents cracks through accurate preheating, relieves stress in real time, improves stability, and guarantees welding precision through coaxial clamping.

The invention discloses an automatic post-welding treatment device for a steel structure welding part, and relates to the technical field of stress relief, the automatic post-welding treatment device comprises a setting frame and a bearing, the bearing is mounted on one side surface of the setting frame, a rotating shaft is mounted on the inner wall of the bearing, a clamping arm is mounted on the outer side surface of the rotating shaft, and a lever extension arm is arranged on one side surface of the clamping arm; a composite flexible floating supporting layer composed of an air bag and sponge is used for isolating base damping, a movable frame descends to be in linkage with a trigger plate to abut against a lever, and an innovative automatic rigid clamping mechanism that side clamping arms are driven to be closed is adopted; and finally, the effects of full-automatic feeding of the steel structure workpiece, stable suspension supporting and efficient post-welding stress vibration elimination under ideal boundary conditions are achieved, and therefore the defects that in the prior art, the labor intensity of workers is large, and the overall stress elimination treatment efficiency is seriously limited are overcome. And a manually-tightened high-strength clamp is easy to loosen under the working condition of long-time high-frequency vibration, so that the treatment effect is unstable.

The invention relates to an additive manufacturing and residual stress measuring method for a nickel-based high-temperature alloy component. The additive manufacturing and residual stress measuring method comprises the following steps that 1, the nickel-based high-temperature alloy component is prepared on a substrate through a selective laser melting technology; 2, the formed nickel-based high-temperature alloy component is separated from the base plate, and stress relief annealing heat treatment is conducted on the nickel-based high-temperature alloy component; the destressing annealing heat treatment comprises the following steps: preserving heat at 550-950 DEG C for 2 hours, and then air-cooling to room temperature; and 3, measuring the residual stress of the nickel-based high-temperature alloy component subjected to stress annealing heat treatment by a contour method. The residual stress of the component is greatly reduced through heat treatment, and cracking and deformation of the component caused by the internal residual stress of the component are avoided.

The invention discloses a rolled plate welding process for a steel tower drum, and relates to the technical field of wind power tower drum rolled plate welding processes, and the process comprises the steps of steel plate pretreatment, intelligent plate rolling, gradient groove processing, segmented temperature control welding, pulse stress relief treatment and the like. The surface of a steel plate is cleaned by adopting a laser cleaning technology, the quality of the steel plate is ensured by combining eddy current detection and the like, the radian deviation of the intelligent rolled plate is corrected in real time through a plate rolling machine with an automatic aligning function and three-dimensional scanning, a composite structure of a 45-degree main groove and a 15-degree auxiliary groove is formed through gradient groove processing, and the size of a truncated edge is adaptively adjusted; the sectional temperature control welding adopts double-wire gas metal arc welding, temperature, current and voltage are controlled in a preheating section, a penetration section and a slow cooling section, residual stress is quickly released through pulse current in pulse stress relief treatment, and the process effectively solves the problems of large welding deformation, low welding efficiency, long stress relief treatment time and the like in large-scale tower drum manufacturing. And the welding quality and the production efficiency are both improved.

A power semiconductor device includes a semiconductor structure comprising an active region, and a plurality of stress relief trenches in the semiconductor structure laterally between the active region and at least one edge of the semiconductor structure. The stress relief trenches respectively comprise opposing sidewalls and a dielectric material and / or a semiconductor material therebetween, and do not contribute to electrical conduction between first and second terminals of the power semiconductor device. Related devices and fabrication methods are also discussed.

The invention discloses a temperature rise verification method for welding reliability of a copper bar, relates to the technical field of copper bars, and provides the following scheme aiming at the problems that potential and developing hidden defects proposed in the background technology cannot be identified and potential safety hazards are buried due to the fact that obvious temperature abrupt change is possibly not caused in the test period. Comprising the steps of sample selection and pretreatment: selecting a to-be-tested copper bar welding part, performing nondestructive testing (such as ultrasonic testing or X-ray testing) on the sample, observing defects such as air holes, slag inclusion, cracks and incomplete penetration, removing obviously unqualified samples, and pretreating the sample, including surface cleaning and stress relief annealing. According to the invention, the artificial intelligence technology is deeply integrated into the traditional temperature rise test process, so that the characteristic mode can be identified when a tiny hot spot is just formed and the overall temperature rise is not caused to exceed the standard, the early intelligent diagnosis of hidden defects is realized, the fault hidden danger is eliminated in the bud state, and the accuracy of the detection result is improved at the same time.

The invention relates to the technical field of analogue simulation, in particular to a plate shape control parameter optimization method based on digital twinning, which comprises the following steps of: constructing a material microscopic performance digital twinning body, calculating the offset of a physical neutral layer through virtual straightening rehearsal, deducing a non-uniform differential curvature target, carrying out reverse iteration, and outputting a global optimal parameter of a straightening machine. And the fracture mechanical model is used for driving the digital twin to perform virtual simulation of shear crack propagation, burr and edge collapse data are calculated, and the angle and surface prestress parameters of a shear knife are adjusted. And the production line laser point cloud and the visual image are fused to construct geometric morphology digital twin bodies, a defect topology fingerprint is generated, the two digital twin bodies are coupled by running a moving target spot interception algorithm, and the optimal transverse track and the local rolling reduction of the stress release roller are planned. According to the method, through multi-physics field virtual simulation and closed loop verification, collaborative optimization of global straightening, dynamic shearing and local repairing in high-strength steel plate production is achieved.

The invention discloses a high-performance Cu-Co-Si alloy plate and a preparation method thereof, and belongs to the technical field of copper alloy materials. The alloy plate comprises the following components in percentage by weight: 1.0-2.5% of Co, 0.2-1.0% of Si, 0.09-0.2% of Cr, 0.01-0.1% of Ni, less than or equal to 0.2% of Ti, less than or equal to 0.5% of Fe, less than or equal to 0.5% of Sn, less than or equal to 0.5% of Zn, less than or equal to 0.5% of P and the balance of Cu and inevitable trace impurities. The preparation method comprises the steps of smelting, semi-continuous casting, hot rolling, cold rolling, cleaning, stress relief annealing, solid solution, final cold rolling, aging and the like. According to the invention, alloy elements are reasonably matched and a preparation process is optimized, so that the alloy plate forms a nanoscale dispersed precipitated phase, dislocation motion is effectively hindered, grains are refined, and synergistic improvement of strength, conductivity and processability is realized. The thickness of the finished board is (0.02-0.15) + / -0.003 mm, the hardness is 180-220 HV, the electric conductivity is 62-66% IACS, the tensile strength is 620-680 MPa, 90-degree bending R / t is 0.5, and the finished board is free of surface defects and can be widely applied to the electronic and electrical field with high reliability and high performance.

A method for induction quenching and leaving a soft zone for ultra-long machine tool guide rails is described. This method is suitable for machine tool guide rails that are prone to cracking at the initial end after quenching or require machining (such as milling or drilling). The method belongs to the field of heat treatment technology. The method includes the following steps: aging, machining, stress relief, medium-frequency induction quenching, and tempering the ultra-long guide rails. The medium-frequency induction quenching utilizes two inductors: one preheating inductor and one quenching inductor. The two inductors are spaced 15-20 mm apart, and the distance between the inductor surface and the quenching surface is 4-6 mm. Heating and quenching begin at a point more than 20 mm from the edge of the machine tool guide rail at the initial end of the quenching process. After this quenching process, the hardness of the quenched area of ​​the guide rail reaches 55-60 HRC, the layer depth reaches 5.0-7.6 mm, and the soft zone length is 20-25 mm. The soft zone still retains the original hardness of the cast iron.

The invention discloses a processing method for solving grain growth in a solution treatment process of a high-temperature alloy, which comprises the following steps of: 1, obtaining a basic bar by adopting a hot working mode, specifically, carrying out forging cogging on a steel ingot, then carrying out hot working on the steel ingot through a fast forging machine or a rolling mill to obtain the required basic bar, and reserving a certain deformation amount; 2, stress relief annealing is conducted on the basic bar obtained in the step 1, and water cooling is conducted immediately after heat preservation is completed; 3, the bar obtained in the step 2 is subjected to cold drawing; and 4, the finished bar obtained after cold drawing is subjected to solution treatment. According to the method, firstly, residual cold deformation of the bar in the hot working process is eliminated through high-temperature stress relief annealing, then the bar reaches the specified size through cold drawing machining, the cold deformation of the bar is larger than critical deformation, finally, after standard solution treatment, grain structures of all parts of the bar are uniform, and abnormal growth of grains does not exist. The process has the advantages of environmental protection, convenience, flexibility and low cost.

An air-cooled cold plate is I-shaped, the side face of one end of the cold plate is a fan mounting face, the bottom face of the other end of the cold plate is a base mounting face, the side face of the middle section of the cold plate is a printed board mounting face, the cross section of the middle section of the cold plate is a crystal oscillator mounting face, fins are arranged in the middle section, air channels are formed among the fins, and a plurality of ventilation openings are formed in the fan mounting face and the base mounting face. The ventilation openings are communicated through fin air ducts; the manufacturing method comprises the steps that selective laser melting is adopted for a blank, 3D printing is adopted for a cold plate blank, a plugging tool is manufactured according to the appearance of an air duct opening, 3D printing is adopted for cold plate rough machining, stress relief annealing is conducted, heat treatment is adopted for releasing machining stress, an ultrasonic thickness gauge is adopted for measuring the thickness of a printed plate mounting face, the thickness allowance is set, and the finish machining allowance is determined. And the machining benchmark is offset, feature finish machining is conducted on the fan installation face, the printed board installation face, the base installation face and the crystal oscillator installation face, and deionized water is adopted to repeatedly wash the air channel.

The invention relates to a preparation process of a metal ceramic bionic multilayer film, and belongs to the technical field of metal ceramic films, and the metal ceramic bionic multilayer film comprises a porous metal matrix, a gradient transition layer, a bionic lamination layer and a nanopore separation layer. According to the method, the failure problem of a traditional metal ceramic film under the extreme working condition is systematically solved through the multi-level innovative design, firstly, in the aspects of thermal stress elimination and interface strengthening, a five-layer gradient transition layer structure with the ceramic content changing is adopted, and the plasma spraying-laser remelting synchronous machining technology is combined; the thermal expansion coefficient of the metal matrix and the ceramic layer is continuously and gradually changed, so that the interface thermal stress is effectively reduced, the bonding strength is improved, the problems of cracking and layering under the high-temperature working condition are effectively solved, the service life is effectively prolonged, the structure is strengthened and toughened, and the bionic lamination design simulates the'brick-mud 'structure of a shell pearl layer; the nano-scale metal layer absorbs crack energy, and the ceramic layer provides rigid support, so that the fracture toughness is effectively improved.

The invention provides a high-strength corrosion-resistant steel strand and a preparation process thereof, and belongs to the technical field of steel strand manufacturing. The steel strand raw material wire rod comprises the following chemical components in percentage by weight: 0.95%-1.08% of C, 1.00%-2.20% of Si, 0.60%-1.45% of Mn, 0.28%-0.38% of Cr, 0.05%-0.09% of V, 0.20%-0.27% of Ni, 0.24%-0.30% of Cu and 0.020%-0.030% of Alt, and (Si + 1.2 * Mn) / (8 * V) is more than or equal to 4.0 and less than or equal to 6.2. The preparation process comprises the key steps of converter smelting, LF furnace refining, RH vacuum degassing composite refining, diffusion annealing, two-section type controlled cooling, multi-pass drawing, intermediate destressing treatment and the like. The tensile strength of a finished product is larger than or equal to 2400 MPa, the corrosion rate of a 5% NaCl solution for 96 h is reduced by 75% or above compared with a traditional 82B wire rod, and the drawing wire breakage rate is smaller than or equal to 0.1%.

The utility model relates to the technical field of levelers, in particular to a leveler with a stress relieving effect, which comprises a leveler frame, a reinforcing plate is fixed on the inner wall of the leveler frame in the horizontal direction, and a cleaning mechanism for cleaning workpieces is arranged on the right side of the leveler frame. A leveling mechanism used for leveling a workpiece is arranged in the leveler frame. And the cleaning mechanism comprises a collecting box, the collecting box is fixed to the right side of the leveler frame, a dust suction machine is fixed to the upper surface of the collecting box through screws, and the input end of the dust suction machine communicates with a conveying pipe. Through the arranged cleaning mechanism, springs are arranged in a first dust collection piece and a second dust collection piece, under the action of elasticity of the springs, a movable block can be pushed to move, a cleaning brush can make better contact with the outer surface of a workpiece, and when the workpiece is conveyed, impurities tightly attached to the outer surface of the workpiece can be swept away.

Disclosed are various embodiments of a wearable relaxation system to be worn by an individual, comprising: a garment; and a compartment located on the garment, the compartment comprising at least: a fabric socket shaped and dimensioned to securely retain therein a stress-relieving member; and an aperture providing access to the fabric socket, through which the stress-relieving member is receivable into and removable from the fabric socket. Embodiments provide a sealing mechanism for closing the aperture, thereby retaining the stress-relieving member in the fabric socket. Between uses, the stress-relieving member can be removed from the compartment for washing, or otherwise can be exchanged with other stress-relieving members to suit an individual's needs. Further embodiments provide for biometric monitoring and / or feedback via the stress-relieving member, and optionally, alerts pertaining to biometric data associated with stress and / or anxiety detected. Further embodiments provide for discreet weighting of garments.

The application discloses a machining method for a large-length-diameter-ratio shaft tooth part, which comprises the following steps: removing excess material from a forging blank; performing heat treatment and quenching and tempering to obtain a quenched and tempered blank; straightening the quenched and tempered blank; performing annealing stress relief treatment on the straightened blank to obtain an annealed blank; performing rough grinding on the outer circle of the annealed blank to obtain a ground blank; clamping and fixing the ground blank on a clamping mechanism to perform rough turning to obtain a rough blank; pre-grinding the rough blank to a target size; clamping and fixing the rough blank on the clamping mechanism to perform finish turning, and thus the large-length-diameter-ratio shaft tooth part is obtained. The machining method reduces the deflection of the large-length-diameter-ratio shaft tooth part to the maximum extent, effectively solves the technical problems of low qualified rate, high production cost and machining precision failing to meet product requirements in the machining of the large-length-diameter-ratio shaft tooth part, effectively enhances the rigidity of the large-length-diameter-ratio shaft tooth part, and effectively reduces the research and development cost of enterprises.

The application discloses a kind of rheological property test methods of adhesive film.The rheological property test method includes;S1, provide multiple adhesive film components;S2, remove the film release film of one of the adhesive film components, and remove the film release film of the adhesive film component is fixed to workbench, bottom film release film is in contact with workbench;S3, remove the film release film and bottom film release film of the remaining multiple adhesive film components in turn, and multiple adhesive film bodies are laminated and bonded together to reach set thickness, wherein the last adhesive film component retains bottom film release film, so that multiple adhesive film bodies are located between two bottom film release films, and two bottom film release films and multiple adhesive film layers between two bottom film release films are to be tested;S4, remove the tested piece from workbench, and keep the tested piece at a set temperature for a set time to eliminate the stress of the tested piece;S5, test the rheological property of the tested piece after stress relief.

Provided are a hot-rolled non-oriented electrical steel sheet and a manufacturing method thereof, in which shot balls are projected onto the steel sheet in the manufacturing process to remove scale, and the surface and internal hardness is adjusted after the shot ball projection, thereby improving iron loss in all directions and iron loss after stress relief annealing. The hot-rolled non-oriented electrical steel sheet of the present invention contains, by weight %, 2.8 to 4.0% Si, 0.1 to 1.3% Al, 0.3 to 2.0% Mn, and the balance being Fe and unavoidable impurities, and satisfies the following formula 1: [Formula 1] 1.1≦Hv1 / HV2≦1.5 (In Equation 1, HV1 represents the hardness measured on the surface of the steel plate, and HV2 represents the hardness measured at a point halfway through the thickness of the steel plate.) It is characterized by further containing one or more of Cr: 0.2 wt % or less (excluding 0%), Sn: 0.06 wt % or less (excluding 0%), and Sb: 0.06 wt % or less (excluding 0%).