13results about How to "Lower yield strength" patented technology

The invention provides a correction jig, a correction method, a rotating shaft cover plate and foldable electronic equipment. The correction jig is used for correcting the straightness of a long-strip-shaped part and is provided with a first groove, and the first groove extends in the first direction; in the second direction, the range of the difference value w1-w1'between the width w1 of the first groove and the width w1 'of the long-strip-shaped part is larger than or equal to 0.05 mm and smaller than or equal to 0.1 mm, and the first direction intersects with the second direction. The correction jig is simple in structure.

The application discloses an electromagnetic riveting device based on a rotating motor and a ball screw technology and belongs to the riveting technical field. The application solves the problems of difficult joint forming and low joint strength after forming when the existing electromagnetic stamping rivetless connection device is used to perform rivetless riveting on a poor plastic connecting plate material. The application comprises a coil assembly and an electromagnetic riveting gun. The coil assembly performs softening treatment on a to-be-connected position. The electromagnetic riveting gun completes stamping rivetless connection on the softening-treated to-be-connected position. The application reduces the yield strength of the joint area of the connecting plate material only under the premise of not reducing the overall strength of the plate material, facilitates the forming of the electromagnetic stamping rivetless joint, and improves the strength of the joint.

The invention provides 450MPa-grade hot-dip galvanized low-density steel with low yield ratio and high corrosion resistance and a manufacturing method thereof. A steel plate comprises the following components in percentage by weight: 0.04%-0.06% of C, 0.25%-0.4% of Si, 1.4%-1.5% of Mn, 3.3%-6.5% of Al, less than or equal to 0.010% of P, 0.01%-0.03% of S, 0.01%-0.015% of RE and the balance of Fe and inevitable impurities. The manufacturing method of the steel comprises the steps of blast furnace molten iron pretreatment, converter steelmaking, continuous casting, hot continuous rolling, acid pickling, cold rolling and hot galvanizing. The steel structure is delta-ferrite, alpha-ferrite, martensite, retained austenite and sulfide, the content of the martensite is 3.5-5%, the sulfide is composed of a small amount of MnS and RE-S-O which are distributed in a dispersed mode, the small amount of MnS is separated out in the ferrite and the martensite in a dispersed mode, and the RE-S-O is distributed along the ferrite grain boundary.

The application belongs to the technical field of advanced manufacturing and mine machinery equipment, and discloses a preparation method of a full-negative Poisson ratio energy-absorbing component, which solves the problem that the existing energy-absorbing component design cannot meet the high energy-absorbing demand under extreme impact working conditions. The method comprises the following steps: (1) full-parameterization design of a macro-negative Poisson ratio structure based on multi-target Bayesian optimization; (2) preparation and process parameter simulation optimization of a micro-negative Poisson ratio steel forming powder; (3) laser additive-warm subtractive composite preparation of a full-negative Poisson ratio porous structure component; and (4) post-heat treatment of the full-negative Poisson ratio porous structure component and macroscopic and microscopic toughening regulation. The application greatly improves the energy-absorbing efficiency, breaks through the bottleneck of high-precision preparation of a complex interconnected porous structure, and realizes the optimal balance of full-parameterization design and multi-target performance.

The present application relates to a kind of aluminum alloy and its preparation method and purposes of improving pedestrian protection performance, the aluminum alloy of improving pedestrian protection performance includes by mass percentage:Si 0.45-0.7%, Mn 0.05-0.15%, Mg 0.45-0.65%, Fe≤0.1%, Cu≤0.1%, Cr≤0.04%, Zn≤0.1%, Ti≤0.1%, impurity element≤0.15%, the balance is Al;The temperature and time of preparation in solid solution treatment satisfy: t (min) =0.0013×Tc 2 -1.4305×Tc+400.29.The aluminum alloy provided by the present application, by adjusting the formula of aluminum alloy, by adopting specific solid solution treatment system, in the case of reducing the yield strength of the obtained aluminum alloy, the elongation of the aluminum alloy is ensured, to ensure that the aluminum alloy meets the requirements when used as automobile sheet.

The invention provides 980MPa-grade hot-dip galvanized low-density steel with low yield ratio and high corrosion resistance and a manufacturing method thereof. A steel plate comprises the following components in percentage by weight: 0.28%-0.32% of C, 0.74%-0.82% of Si, 2.1%-2.32% of Mn, 4.3%-6.5% of Al, less than or equal to 0.010% of P, 0.01%-0.023% of S, 0.01%-0.012% of RE and the balance of Fe and inevitable impurities. The manufacturing method of the steel comprises the steps of blast furnace molten iron pretreatment, converter steelmaking, continuous casting, hot continuous rolling, acid pickling, cold rolling and hot galvanizing.

This invention discloses a briquetting device for recycling non-ferrous scrap metal, relating to the field of metal resource recycling technology. It includes a forming box, a feeding mechanism, a briquetting mechanism, and an atmosphere protection mechanism. A controller is fixedly installed on one outer wall of the forming box, and a weighing plate with a built-in weight sensor is fixedly installed on the bottom inner wall of the forming box. This invention uses a rodless cylinder-driven reciprocating feeding cylinder, combined with a screw feeder and a laser ranging probe, to achieve multi-layer, multi-point uniform distribution of material within the forming box. This effectively avoids the problem of uneven briquetting density distribution caused by material accumulation on one side in traditional devices, improving the overall density consistency of the briquetting. The weighing plate with the built-in weight sensor accurately measures the weight of the material for each briquetting operation, and combined with an ultrasonic thickness sensor to detect the thickness of the briquetting blocks after forming, this invention ensures that the weight and thickness of each briquetting block are within the set range, meeting standardized production requirements.

This invention relates to a manufacturing process for stainless steel pipes, comprising the following steps: S1, raw material preparation; S2, heating and piercing; S3, hot rolling and stretching, controlling the grain size to grade 4-6; S4, pickling and grinding: shot blasting to remove oxide scale, followed by mixed acid (HNO₃+HF) pickling for 30-45 s, and finally local grinding, with defect depth ≤0.1 mm; S5, cold working; S6, solution treatment; S7, straightening and end cutting: ten-roll straightener, straightness ≤1 mm·m⁻¹; end cutting and tail trimming, with a 30° chamfer on the end face; in step S1, the EAF initial refining uses a "low carbon, low titanium" feedstock, with Ti controlled below 0.03% to reduce TiN nucleation; AOD uses a "double slag + strong bottom blowing" process, with CaO-CaF₂ slag basicity ≥2.5 and argon flow rate 0.15–0.20. The process involves Nm³·t⁻¹·min⁻¹, causing As, Sn, Pb, and Bi to enter the gas or slag phase, with the sum of the five low-melting-point elements ≤120 ppm. This invention utilizes gradient heating combined with low-stress piercing to prevent the low-melting-point harmful phase (Pb-Bi-Sn eutectic) from melting, reducing the piercing center crack rate from 4.1% to 0.25%, and achieving a first-pass yield of >99% in flaw detection.

The application provides a synergistic composite toughening PP-R pipe material and a preparation method and application thereof, and belongs to the technical field of PP pipes. The synergistic composite toughening modified PP-R pipe material provided by the application can improve the toughness of the material at room temperature and low temperature by adding an elastomer toughening agent. The addition of PP-B and PE can limit the excessive reduction of tensile strength and yield strength caused by the addition of the elastomer, so as to maintain the balance between toughness and rigidity. The addition of a compatibilizer can improve the interface bonding problem of the blend, especially the dispersion effect of the elastomer toughening agent and PE, and reduce the phase separation between PP and the elastomer and PE. The application forms a PP-R / elastomer / PE / PP-B multi-component synergistic composite toughening system through various components, realizes the complementation and synergistic improvement of the performance of the materials, and thus improves the performance of the PP-R pipe.

The utility model provides a transport vehicle which comprises a tank body and a liquid loading and unloading pipeline, the liquid loading and unloading pipeline comprises a pipeline and an energy collapse connecting piece, the energy collapse connecting piece and the pipeline are connected in series to form a liquid inlet and outlet channel, one end of the liquid inlet and outlet channel is connected with a pipeline connector of the tank body, and the other end of the liquid inlet and outlet channel extends to the outer side of the tank body. And the fluid can enter the tank body or be discharged from the tank body through the liquid loading and unloading pipeline. Wherein the yield strength of the energy collapse connecting piece is smaller than that of the pipeline, and when the transport vehicle is collided, the energy collapse connecting piece deforms before the pipeline and the tank body, so that the energy collapse connecting piece can absorb energy generated by collision, and the purpose of protecting the tank body to prevent liquid in the tank from leaking is achieved. And meanwhile, the fire extinguishing agent stored in the cavity of the part at the impacted part is scattered to cover the impacted part, so that the fire hazard is eliminated from the source.

The application provides a post-weld heat treatment method of an aluminum electrolysis cell shell, 1) installing a graphite anode and a graphite cathode on a heat treatment pool; 2) then loading resistance material and the shell into the heat treatment pool, and controlling the resistance material to completely bury, surround and cover the shell inside and outside and up and down and left and right; 3) connecting direct current, the direct current output by the graphite anode and the graphite cathode is transmitted to the resistance material, the resistance material generates heat when the direct current passes through the resistance material, the heat generated by the resistance material heats the shell to 500-700 DEG C and performs tempering treatment with heat preservation, and then naturally cools down after the tempering treatment is finished; 4) then moving part of the resistance material and the shell out; the welding residual stress is eliminated, the shape and size of the shell are stabilized, the distortion is reduced, the performance of base material and a welding joint is improved, the plasticity of the welding seam metal is improved, the hardness of a heat affected zone is reduced, the fracture toughness is improved, the fatigue strength is improved, the yield strength is recovered or improved, and harmful gas in the welding seam metal is released.

This invention discloses a method for forming ultra-thin stainless steel pipe fittings, relating to the field of stainless steel pipe production and processing technology. It aims to solve the problems of branch pipe rupture and inner wrinkling during the current hydroforming process of ultra-thin stainless steel pipe fittings. The method includes: S1: billet preparation and pretreatment; S2: mold and sealing assembly; S3: staged collaborative forming; S301: pre-expansion and mold-fitting stage, where the internal pressure is increased to 0.8 MPa at a rate of 0.1 MPa / s and maintained stably; S302: main forming precise material replenishment stage, employing a gradient pressure increase strategy; S303: forming stress release stage, maintaining a stable internal pressure of 6-7 MPa for 10 seconds to ensure the billet completely fits the mold cavity, followed by a staged pressure relief method. This invention, through the application of a nano-lubricating film coating on the inner wall of the billet, low-temperature preheating treatment, stress-dispersing mold design, and the collaborative control of gradient pressure increase and real-time monitoring and material replenishment during the main forming stage, achieves effective dispersion of tensile stress concentration at the top of the branch pipe of the ultra-thin stainless steel pipe fitting and precise material replenishment, significantly reducing the risk of rupture.

The invention provides galvanized DH1180 steel, a production method thereof and a steel product. In the production method, the components of the molten steel are optimized firstly, so that reasonable tissue and product tensile strength can be obtained in the galvanization process, the tensile strength of a finished product is ensured to be at the 1180MPa level, and meanwhile, the tensile strength of a hot rolled steel coil can be improved. Compared with a conventional hot rolling-acid pickling-cold rolling process, a cover annealing operation is added after acid pickling, namely, the hot rolling-cover annealing-acid pickling-cold rolling process is adopted, so that the tensile strength of the hot rolled steel coil subjected to acid pickling is obviously reduced, and meanwhile, the yield strength of the hot rolled steel coil is also reduced to a certain extent; according to the method, the stability of follow-up cold rolling is better facilitated, the problem that edge cracks are likely to be generated after cold rolling is solved, the cold rolling yield is increased, and the finally produced galvanized DH1180 steel finished product has the beneficial effects of being low in yield ratio, high in hole expansion rate and high in ductility.