125 results about "Homogeneous deformation" patented technology

The invention relates to a method for producing an X80 grade large deformation resistant pipeline steel medium plate. The economic component design with low carbon is adopted to perform controlling and rolling stages on ingot, namely rolling the grain refined zone and the non grain refined zone. The method comprises: firstly, air cooling and relaxing after finished rolling is performed so that the temperature of a steel plate before entering water and cooled is reduced below the phase change point Ar3 between 30 and 50 DEG C, and 50 to 70 percent of austenite in the relaxing process is converted into proeutectoid ferrite; and secondly, laminar flow cooling is performed on the steel plate within the range of the cooling speed between 20 and 35 DEG C per second, the finished cooling temperature is controlled within the range of between 250 and 400 DEG C; and in the water cooling process, the remaining austenite is converted into bainite structure, and proeutectoid ferrite + bainite double-phase structure is obtained. The intensity and the plasticity index of the finished product satisfy the following requirements: the yield strength Rt0.5 is 530 to 630MPa, the intensity of tension Rm is 625 to 825 MPa, the yield ratio Rt0.5/Rm is less than or equal to 0.80, and the homogeneous deformation tensile stretch UEL is more than or equal to 10 percent.

The invention provides a method for forecasting the high-temperature-alloy creep life. The method includes the steps that on the basis of the theta projection method, the factor that changes of true stress are caused by changes of the material shape in the creep process is introduced, the correction theta projection method is obtained, and the concrete form is epsilon= theta1*(1-exp(theta2*(1+theta5*epsilon)*t))+theta3*(exp(theta4*(1+theta5*epsilon)*t)-1). The method can be used for forecasting a creep curve at the whole homogeneous deformation stage through initial data from the first stage to the third stage of the creep curve, and the obtaining time of creep data can be shortened. Meanwhile, the method can be used for forecasting creep curves under other creep conditions, and the forecasting process comprises forecasting of the creep rupture time under the some creep condition and the creep interruption time corresponding to some creep strain. The method is simple, reliable and suitable for different-type high temperature alloy and engineering application, and has broad prospects in the aspect of high-temperature-alloy creep life management.

The production process of high precision semi-hollow pure copper section bar includes extruding V-shaped blank in V-shaped hot extruding mold at about 850 deg.c and cold drawing in combined mold withlocating slot and core rod having hem. The V-shaped hot extruding mold has opening larger than that required in producing C-shaped section bar, and the combined mold is combined structure of separated core mold and outer mold with hem to make the blank enter to the mold cavity smoothly for homogeneous deformation. The drawn head is forged into size smaller than the aperture of the outer mold for penetrating through and is clamped with a clamp for drawing out to obtain finished product. The said method can produce section bar with precise and stable size and high strength in high yield.

The invention relates to a microalloy non-quenched and tempered steel forging and cooling control technology and an automatic production line, which belong to the field of metal materials processing, i.e., the forging deformation parameters and the post-forging cooling technology of the non-quenched and tempered steel are controlled, and the post-forging cooling technology is realized on a post-forging cooling control production line. The cooling production line consists of a cooling medium supply system, a power transmission mechanism, a temperature detection system, an industrial control computing system, a feed and discharge mechanism and a heat insulation system, can be manually and automatically operated according to the cooling velocity, the production cycle and the established procedure of non-quenched and tempered steel workpieces, and the ranges of the forging and cooling velocities can be adjusted. After the microalloy non-quenched and tempered steel forging and cooling control technology and the automatic production line are adopted, the phenomena of the uneven textures and performances of the non-quenched and tempered steel workpieces, the deformation and the like are eliminated, the problem of unqualified parts is solved, and the forging metallographical texture, the plasticity and ductility indicators, the production efficiency and the yield are improved.

The invention discloses a shield tunnel duct piece both-way prestress strengthening device and a construction method. The device comprises a plurality of sets of combined duct pieces arranged in the circular direction, and at least one ring of special duct piece is arranged in the middle of each combined duct piece. A plurality of sets of ordinary duct pieces coaxial with the combined duct pieces are arranged between the adjacent combined duct pieces. A stress ring is embedded in each ring of special duct piece. Each stress ring comprises at least two sections of half stress rings. The two stress rings, the same in position, on every two adjacent combined duct pieces are connected through a fastening structure. The shield tunnel duct piece both-way prestress strengthening device has the beneficial effects that the stress rings are arranged in the circular direction of the duct pieces, the duct pieces are supported through the stress rings in the circular direction, and the strengthening of the duct pieces in the circular direction is achieved; in the longitudinal direction of the duct pieces, the duct pieces are tightly extruded through steel strands, and uneven longitudinal deformation of the tunnel duct pieces is limited; longitudinal and circular-direction strengthening is carried out on the duct pieces at the same time, a simply supported beam effect is formed through the duct pieces within a certain length range, the uneven settlement or uneven load resisting capability of the duct pieces is improved, and the strength of the shield tunnel duct pieces is improved.

The invention discloses a method and structure for arranging horizontal structural joints on a concrete face of a rockfill dam. According to the method and structure for arranging the horizontal structural joints on the concrete face of the rockfill dam, the concrete face is partitioned by section in sequence from bottom to top when the concrete face (1) is poured, and the horizontal arc-shaped joints (2) are arranged at the positions where the concrete face is partitioned; a plastic waterstop(4) is arranged on the outer surface of the concrete face (1) so that the outer ends of the horizontal arc-shaped joints (2) can be sealed, and a copper sheet waterstop (3) is arranged on the surface, in contact with a dam body (7), of the concrete face (1) so that the inner ends of the horizontal arc-shaped joints (2) can be sealed. According to the method and structure for arranging the horizontal structural joint of the concrete face of the rockfill dam, due to the facts that the horizontal structure joints are arranged on the concrete face and the arc-shaped joint structure is adopted, cracking, squeezing and fractureing, caused by serious uneven deformation, of the face which is in the direction perpendicular to the direction of the axis of the rockfill dam can be effectively avoided, the problem of deformation, the problem of fractures and leakage of the face of the rockfill dam can be well solved, and the reliability of the anti-leakage capacity of the concrete face of the rockfill dam is improved.

The invention discloses an extrusion forming method for no-anisotropy magnesium alloy rods. The method relates to an extrusion forming mold for the no-anisotropy magnesium alloy rods; the mold comprises an insert, a convex mold connected with a press, a concave mold connected with a rotating mechanism, and an ejecting mechanism; a molding cavity is formed in the concave mold, and is provided witha feed port; an extrusion working belt is arranged in the molding cavity; and the insert is mounted on the extrusion working belt. The torque is applied based on traditional extrusion; the rotating lap number can be increased through change of the rotating speed, so that the gradient structure is improved under rotating formation, and the uniform deformation of the structure is realized; the higher shearing strain is generated through change of internal stress and strain states of a deformation body to form a fine crystal structure with large-angle grain boundary, so that the anisotropy of components is reduced; and insert can be timely replaced after wear to prevent the cost increment of the scrapped concave mold, so that the mold life is prolonged, and the popularization and economical benefit in the forging industry is prominent.

The invention discloses a manufacturing method for rolled products for nuclear grade in-pile U-shaped embedded part locating pins, and aims to obtain the rolled products with uniform, fine and small-range grain structures and qualified tensile properties. The composition proportion is optimized; 3150-ton fast forging large deformation amount and single hammer reduction amount cogging is adopted, and four hammers are adopted in a 1800-ton diameter forging machine to achieve isothermal forging; the finished product rolling heating temperature is controlled at 1160 DEG C to 1180 DEG C, and secondary carbide and a gamma' strengthening phase generated by an alloy are re-dissolved, so that dynamic recrystallization of grains in the final rolling process is more uniform; small deformation mount quick rolling is adopted for the final-heating number rolling of finished products, it is guaranteed that all heating number rolling deformation is controlled to be uniform, the deformation amount is between 30% and 50%, the roller rotating speed is increased, and it is ensured that the final forging temperature is not lower than 950 DEG C. The manufacturing method has the beneficial effects that the carbon content is appropriately controlled, alloy elements such as aluminum, titanium and niobium are highly controlled, the hammer cogging and rolling processes are reasonably controlled, and thealloy rolled products with the uniform grain size structures and excellent performance are manufactured.

The invention discloses an asymmetric self-compensating rolling working roll applicable to short-stroke roll shifting and an implementation method thereof. The working roll comprises a convexity adjusting section, an abrasion control section and a structural process section which are connected in sequence, wherein all roll shape sections are respectively positioned at the transmission side and theoperation side of a rolling mill; an upper working roll and a lower working roll respectively shift towards the middle of the rolling mill every time when a roll of strip steel is rolled; and a unidirectional aperiodic roll shifting strategy is adopted. The roll shape and the roll shifting strategy of the working roll are designed according to the width of the rolled strip steel; the asymmetry ofthe roll shape and the roll shifting can be utilized; the abrasion form of the working roll is effectively changed; multiple control on uneven deformation convexity, edge drop and uneven abrasion isachieved; the shape of a bearing roll gap is improved; the effective regulation and control on the roll bending force is guaranteed; the rolling unit is expanded; and the strip steel plate shape control capability is improved. The requirement for free regulation rolling plate shape control under the conditions of wide strip steel hot rolling short-stroke roll shifting machine type and rolling unitexpansion can be met.

The invention discloses a rear longitudinal beam and a vehicle body, which belong to the technical field of automobiles. The rear longitudinal beam includes a rear longitudinal beam main body integrally formed by aluminum alloy casting, which has high strength, short working hours, low quality, low cost and good anti-corrosion performance; The longitudinal beam body includes the first force-bearing part, the second force-bearing part and the third force-bearing part connected in sequence. The structural design of the rear longitudinal beam is designed in combination with the actual force-bearing situation, so that the force is uniform and the deformation is small. The first force-bearing part The force-bearing surface of the first plane is the first plane, and the first connecting hole is opened on the first plane; the force-bearing surface of the second force-bearing part is an inwardly concave curved surface, and an annular connector is arranged on the curved surface, and the surface opposite to the curved surface A reinforcing part is arranged on the top to ensure the thickness of the stress-bearing part of the second force-receiving part; the force-receiving surface of the third force-receiving part is a second plane, and a second connection hole is opened on the second plane. The body adopts the above-mentioned rear longitudinal beam, so the structure has high strength, low mass, low maintenance cost, long service life, and improved safety and reliability.

The invention provides a forging process method for refining austenitic stainless steel grains, which can solve the problem of coarse grain structures of a forged piece and improve the corrosion resistance of austenitic stainless steel. A wide anvil strong pressure deformation method and a temperature control narrow anvil uniform deformation method are provided according to the flow deformation situations of metals in different regions of the forged piece in the forging process. The method comprises the following steps of firstly, forging by adopting the wide-anvil strong-pressure deformationmethod, so that the inner layer of the forged piece is fully deformed; and then finishing subsequent forging according to the temperature control narrow anvil uniform deformation method, so that the surface layer of the forged piece is fully deformed. According to the operation steps and key points of the method, internal pores of the forged piece can be quickly laminated. Meanwhile, fine grain structures are achieved on the surface layer and the inner layer of the forged piece, and the grain size is larger than or equal to the fourth grade.

A centrifugal model test simulation method for a barrier dam is characterized by simulating a barrier body by using a mixed material of gravel and sand in a model box, randomly arranging potassium nitrate powder in the model box, placing the model box in a basket of a centrifugal machine, injecting water into the model box after a centrifugal acceleration is stable at a set value, dissolving the potassium nitrate powder, forming a pore structure in uneven distribution in the barrier body, and simulating the generation of uneven deformation. The invention also provides a centrifugal model testsimulation system for the barrier dam. The centrifugal model test simulation method and the centrifugal model test simulation system of the invention aim at the characteristics that the barrier dam material has complex characteristics, and has unevenly distributed large pore structures and uneven deformation in the inner part, and realize simulation of the unevenly distributed pore structures of the barrier dam in a geotechnical centrifugal machine.

The invention provides a step-by-step progressive hot forming and hot correcting integrated method for a thin-wall integral wall plate with ultrahigh reinforcing ribs and oversized flanges. An original blank of the integral wall plate in a flat state is clamped on a three-axis numerical control machine tool through a vacuum flexible clamping technology, and numerical control milling machining is conducted on the ultrahigh reinforcing ribs, the oversized flanges and grids of the thin-wall integral wall plate. Then, vibration is adopted for stress relieving, the influence of material internal stress on machining deformation is eliminated. Through the equal-rigidity reinforcing technology and the step-by-step progressive hot forming and hot correcting integrated technology, the following problems are solved that when the aluminum alloy thin-wall integral wall plate with the ultrahigh reinforcing ribs and the oversized flanges is formed, the forming resistances of the reinforcing ribs andthe flanges of the wall plate are greatly different, serious uneven deformation is likely to happen, a transition area around the flange is likely to break in the deformation process, and the formingdifficulty is very large. The method achieves low-stress manufacturing of the thin-wall integral wall plate structure with the ultrahigh reinforcing ribs and the oversized flanges.

The invention relates to a numerical solution method for rock stratum-lining stress deformation of a shield subway tunnel, which comprises the following steps of: 1) defining geometrical parameters and material parameters of a tunnel structure according to geological survey data; 2) establishing a two-dimensional numerical calculation model, dividing model grids, defining model boundary conditions and stress field conditions, and calculating the model to balance; 3) applying gravity load according to material attributes, resetting the displacement of the model and calculating the model to be balanced; 4) excavating a tunnel in the model, defining a non-uniform deformation convergence mode based on gap parameters, controlling a displacement boundary by debugging the stress of each node of a rock stratum boundary, and calculating the model to be balanced; (5) applying a lining to the tunnel boundary, releasing tunnel boundary stress to reduce the tunnel boundary stress to 0, and calculating the model to be balanced, and (6) extracting a rock stratum-lining stress and deformation distribution rule according to the balanced model.By simplifying the three-dimensional numerical method of the shallow-buried shield subway, a beneficial reference can be provided for the design of a shield subway structure.

The invention relates to a method for reducing uneven deformation of an orthogonal steel bridge deck slab and the deck slab. Girder I-shaped steel is arranged on the bottom surface of the deck slab, the length direction of the girder I-shaped steel is consistent with the length direction of the deck slab, and a top wing plate of the girder I-shaped steel is in contact with the deck slab to reduceoverall deformation of the deck slab. Fourth I-shaped steel and fifth I-shaped steel which are orthogonal are arranged on the bottom surface of the deck slab. The deformation of the deck slab betweenthe two pieces of girder I-shaped steel is borne by the fourth I-shaped steel and the fifth I-shaped steel which are orthogonal, and the force borne by the fourth I-shaped steel and the fifth I-shapedsteel is transmitted through third I-shaped steel to first I-shaped steel and second I-shaped steel which are orthogonal. Because the first I-shaped steel is fixed on a web plate of the girder I-shaped steel, the force is finally borne by the girder I-shaped steel. The girder I-shaped steel bears the pressure received by the deck slab through the girder I-shaped steel arranged side by side and the I-shaped steel orthogonally arranged between the girder I-shaped steel, uneven deformation of the deck slab is prevented, and therefore the deck slab or a truss structure is prevented from being damaged.

A simulation-assisted additive manufacturing system and method for generating an anisotropic compensation to account for non-uniform deformation due to additive manufacturing and service loading. The predicted deformation may not be fully defined. The present disclosure provides a system and method for estimating the missing deformation data through regression analysis. The present disclosure also provides an integrated framework where the various simulated-assisted design modules are configured for two-way communication and sharing access to changes to the model.

In the hot rolling process of crossed steel, systemic caliber configuration of open-train mill roller is utilized and the caliber system includes common trapezoid hole, cap-shaped under hole and raised trapezoid hole in the coarse rolling part as well as double-wedged caliber combination in precision rolling part. The hot rolling processing can form in once process and has homogeneous deformation, no need correction of rolled product and low cost. It is suitable for various mill with roller of 32-500 mm diameter.

Heterostructure-based multi-type reinforced austenitic stainless steel is characterized by comprising the following chemical components in percentage by mass: less than 0.05% of C, less than 0.50% of Si, less than 1.3% of Mn, 14-16% of Cr, 7-9% of Ni, 1-3% of Mo, less than 1.4% of Cu, less than 0.01% of S, less than 0.02% of P and the balance of Fe and inevitable impurity elements. The martensite transformation temperature of the austenitic stainless steel is more than-60 DEG C and less than 40 DEG C. According to the high-strength austenitic stainless steel, austenite is stabilized by refining grains and increasing dislocation and other defects. Compared with the existing austenitic stainless steel, the heterostructure-based multi-type reinforced austenitic stainless steel needs less alloy content and has better economic efficiency. Through multiple types of strengthening modes (including fine grain strengthening, second phase strengthening, precipitation strengthening, solid solution strengthening and non-uniform deformation strengthening) based on a heterostructure, only a small amount of work hardening capacity is sacrificed, and the austenite can still keep the uniform elongation exceeding 20% while reaching the 125 steel grade (862 MPa).

The invention discloses a method for processing a hyperelastic nickel-titanium alloy wire. The method is specifically implemented according to the following steps: 1, axially stretching an annealed nickel-titanium alloy wire at room temperature, wherein uniform deformation is generated in the radial direction of the annealed nickel-titanium alloy wire within the length range of the whole wire after axial stretching, and the radial uniform deformation is 18-26%. 2, unloading the nickel-titanium alloy wire obtained after axial stretching; and 3, carrying out strain heat treatment on the unloaded nickel-titanium alloy wire to obtain the hyperelastic nickel-titanium alloy wire with the improved bending fatigue performance. The bending fatigue performance of the hyperelastic nickel-titanium alloy wire is improved, and the hyperelasticity and the bending fatigue performance of the nickel-titanium alloy are both considered.

The invention discloses a non-destructive riveting device and a non-destructive riveting method for a CFRP component. The non-destructive riveting device for the CFRP component comprises jacking iron, a rivet, the CFRP component, a countersunk head gasket, a positioning sleeve, a riveting die and a bush with a countersunk head, the rivet is arranged above the jacking iron and penetrates through the CFRP component, the countersunk head gasket and the positioning sleeve. The countersunk head gasket is located above the CFRP component, the positioning sleeve is located above the countersunk head gasket, the bush with the countersunk head is arranged between the CFRP component and the rivet, and the riveting die is arranged above the positioning sleeve. According to the riveting method, the countersunk head gasket and the bush with the countersunk head are adopted, a buffering and restraining area is provided for deformation of a rivet head part, a large amount of deformation acting force of the rivet acts in a groove of the countersunk head gasket, radial expansion of a rivet rod in the CFRP component is limited, only small amount of uniform deformation occurs, and riveting damage to the CFRP component is avoided.