139 results about "Yield limit" patented technology

A system and method for deriving semiconductor manufacturing process corners using surrogate simulations is disclosed. The method may be used to determine individual performance metric yields, the number of out-of-specification conditions for a given number of simulation samples, and a total yield prediction for simultaneous multi-variable conditions. A surrogate simulation model, such as a Response Surface Model, may be generated from circuit simulation data or parametric data measurements and may be executed using a large number of multi-variable sample points to determine process corners defining yield limits for a device. The model may also be used to simulate process shifts and exaggerated input ranges for critical device parameters. In some embodiments, the derived process corners may better represent physically possible worst-case process corners than traditional general-purpose process corners, and may address differences in process sensitivities for individual circuits of the device.

The invention discloses a method and device for forming a metal reducer pipe based on a laser shock wave technology and belongs to the technical field of laser processing. In the invention, the upper end part, separated from a pipe fitting, of a plugging rod is coated with a laser energy absorption layer; a laser beam enters the interior of a pipe billet to be formed along the axis of the pipe billet, thereby irradiating on the absorption layer on the upper end part of the plugging rod; the absorption layer absorbs laser energy so as to be gasified and ionized, thus forming high-voltage plasmas; and the high-voltage plasmas quickly expand to form a high-amplitude shock wave, thereby promoting the expansion of the pipe billet until the pipe billet is jointed with the profile of a mould, therefore the deformed shape of the pipe billet is in accordance with the profile of the mould. In the invention, the laser shock wave controlled in parameter is utilized as a power source for internal high pressure forming of the pipe billet, and good safety is provided; and the method and device provided by the invention are suitable for not only forming the pipe billet of a material extremely low in yield limit, but also forming the pipe billet with high yield strength; besides, continuous multi-pulse laser irradiation can be performed and uninterrupted multi-impact can be carried out; and high production efficiency is ensured.

The invention discloses a process for quenching-distribution heat treatment on 60Si2CrVA steel spring for trains. The process comprises the following steps: polishing a 60Si2CrVA steel round bar with diameter less than or equal to 50mm, and heating the steel round bar to a temperature of between 960 and 1,060 DEG C through an inductive heating mode; then, wrapping the 60Si2CrVA steel round bar into a spring in the temperature state; cooling the wrapped spring to a temperature of between 810 and 900 DEG C, quenching the spring at a temperature of between 130 and 210 DEG C, and keeping constant temperature for 10 to 60 seconds; quickly placing the spring in a medium at a temperature of between 280 and 350 DEG C, maintaining for 50 to 800 seconds, and placing the spring into water or oil for cooling; and tempering the spring at a temperature of between 250 and 470 DEG C for 60 to 120 minutes. The 60Si2CrVA steel spring product has the advantages of high yield limit and fatigue strength, good quenching harden ability, high tensile strength and yield ratio, high toughness and the like.

The invention discloses a straightening proposal of a metal slab band roller-typed combined straightener, which belongs to the technical field of the metal slab band straightener and is the improvement aiming at the existing straightening proposal. The invnetion is characterized in that in a roller system combined by a small roller system and a big roller system, a 'parallel straightening proposal' with equal rolling reduction both in a front roller system and a rear roller system is adopted, the rolling reduction thereof is as follows: s equals to 2rhow plus h-(2rhow plus h)<2>-t<2>/4, wherein, 2rhow is the curvature radius of the bend of the slab band, rhow equals to (h question mark E )/2 sigmas, h is the thickness of the slab band, E is the elastic modulus of the slab band, sigmas- is the yield limit of the slab band, and t is the roller nip of the big roller system.

The invention relates to a one-step shaping method for a non-aging reinforced aluminum alloy whole wallboard based on an autoclave. Firstly, an aluminum alloy plate blank is fixed onto a shaping die, is sealed in a vacuum state, and is placed into the autoclave; the temperature inside the autoclave is then raised to the full annealing temperature of the aluminum alloy, the pressure inside the autoclave is increased to the pressure required by contact molding of a component, and plastic deformation of a large-curvature area material occurs when the yield limit is reached; the temperature and the pressure are lowered slightly, so that the component is kept at the contact molding state and creep deformation occurs; finally, pressure and temperature in the autoclave is released, the required component shape and surface are obtained after the plate blank rebounds. The method adopts local plastic deformation and creep deformation to release a great amount of internal stress, so that residual stress of the formed workpiece is reduced, and uneven performance caused by difference of local internal stress of the workpiece is eliminated; the production period is shortened, the final rebound amount is obviously reduced, the tooling is simple, only one set of lower die is required for realization, and die cost is greatly saved.

The invention belongs to the fields of quantitative description and life calculation and analysis of ultrahigh-cycle fatigue damage coupling mechanisms of iron system materials and in particular relates to a method for calculating ultrahigh-cycle fatigue crack initiation time. The method comprises the following steps: by adopting principles such as an energy conservation principle, elastic mechanics and fracture mechanics, taking a hollow shaft as an example, establishing a three-dimensional transient temperature field, providing a quantitative model and time calculation method in the ultrahigh-cycle fatigue crack initiation process under the coupling effect, giving novel crack initiation basis, and performing allowable stress design reasoning. The propagation of cracks is discontinuous, the change of outside action time and change of the crack length are in the same direction, and the change speed is influenced by surface energy and yield limit. The scheme has the advantages that the method is based on the quantitative model of the crack initiation under the multi-factor coupling effect when the material interior crack size is zero. The method directly contributes to estimating the observable crack scale and crack initiation time in actual production and is scientific.

The invention relates to a method for predicting resilience of a bar subjected to two roll straightening, and belongs to the technical field of two-roll straightening machines. The method comprises the followings steps: firstly, determining the offset of a stress neutral layer when the rod is subjected to straightening; then, determining a deformation-hardening coefficient and tension-compression stress distribution according to different straightening processes and deformation characteristics of rods in different specifications; finally, determining the model for predicting rebound bending moment and straightening rebound deflection by combining a pure bending and rebound theory, wherein the rebound deflection delta is related to the following variables of R, sigma<t>, lambda, xi, psi, kappa, I, E, L, B, n, R0, Rw, P and tau; R represents a rod radius; sigma<t> represents the yield limit; lambda represents a hardening coefficient; xi represents an elastic region ratio; psi represents a neutral layer offset radius ratio; k represents an anti-bend rate; I represents rod section moment of inertia; E represents modulus of elasticity; L represents the distance between the two end points in three-point bending; B represents a plastic coefficient; n represents a hardening index; R0 represents an initial bending radius; Rw represents an anti-bend radius; P represents straightening force; tau represents a correction coefficient. According to the method, a straightening and deformation process can be truly reflected, and the straightening theory can be perfected; resilience in the straightening process can be accurately predicted, and bases for the roll shape design and process parameter establishment are provided.

The invention relates to a method for calculating a material removal rate for liquid magnetic grinding tool small hole finishing processing. According to magneto-rheological features of a liquid magnetic grinding tool, a material removal mechanism of liquid magnetic grinding tool small hole finishing processing is explained from a microcosmic point of view. A double-blade circle radius model is adopted to serve as a cutting model of a single abrasive particle for research, a mathematical expression of the material removal rate of small hole finishing processing is deduced, theoretical analysis is carried out on influence factors of the mathematical expression, and accordingly it is concluded that the material removal rate of finishing processing is in direct proportion to the square of the diameter of the abrasive particle, shearing stress of the liquid magnetic grinding tool and fluid pressure, and is in inverse proportion to the yield limit of a workpiece material. In a certain range, removal efficiency of the material can be improved by increasing the diameter of abrasive particles, inlet pressure and current intensity, and quality of surfaces obtained after the surfaces are processed for a period of time is correspondingly improved.

The invention relates to a spiral hoop reinforcement manufacturing machine, wherein a motor output shaft drives and is connected with a speed reducer, the low-speed end of the speed reducer is connected with a forming disc, a disc round steel wire arranged on a charging tray is dynamically connected with the forming disc through a straightener, a wire drawing machine and a counter, and the forming disc performs wire drawing and hoop reinforcement manufacture while rotating. The spiral hoop reinforcement manufacturing machine has unique structure design, simple and practical structure and low cost, skillfully combines the wire drawing with the spiral hoop reinforcement manufacture to achieve multiple functions by one machine, and performs square and polygon cold enwinding by using drawing force close to a steel wire yield limit generated in the cold drawing process of the steel wire; and because the drawing force is close to the steel wire yield limit, after the cold enwinding and forming, elastic deformations are not generated so that the dimension is stable and unchanged and the spiral hoop reinforcement is formed after continuous enwinding. The spiral hoop reinforcement manufacturing machine not only reduces the production cost, but also improves the production working efficiency by more than 10 times, thus the machine can achieve production increment, synergy, consumption reduction and energy conservation.

The invention relates to a production technology of a longitudinal beam of a high-strength heavy load truck, comprising the following steps of: A, coiling materials; B, uncoiling; C, slitting; D, leveling; E, carrying out rolling shaping; F, carrying out quenching heat treatment, wherein the quenching temperature is 840 to 870 DEG C; G, punching, wherein the punching diameter is less than or equal to two times of that of the plate thickness; H, cutting holes which can not be punched by laser; and I, transferring into other procedures. Based on the existing technology, a quenching heat treatment technology is added before punching so as to achieve the aim of producing a high-strength longitudinal beam. If high-strength materials are directly adopted and purchased, the production technology at present is very difficult to realize, so all manufacturers do not adopt single-beam truck frames at present. By adopting the technology to carry out heat treatment, the mechanical property of the longitudinal beam is enhanced, and especially the yield limit can reach 800 to 900MPa. As the high-strength longitudinal beam is used, the strength of the car frame can be greatly enhanced by plate materials with the same thickness, a secondary beam can be cancelled simultaneously, so the total weight of the car frame can be reduced.

The invention discloses a machining process for an internal combustion engine expansion breaking connecting rod. The machining process includes the steps of forging and pressing forming, wherein a blank is formed to be a workblank of the internal combustion engine expansion breaking connecting rod; normalizing, wherein the workblank of the internal combustion engine expansion breaking connecting rod meets mechanical property requirements for the workblank; shot blasting and flaw detection, wherein oxide skin on the surface of the workblank of the internal combustion engine expansion breaking connecting rod and generated due to heating in the forging and pressing forming is removed, and it is guaranteed that flaw and folding defects do not exist in the surface of a product; chipping machining, wherein the workblank of the internal combustion engine expansion breaking connecting rod is machined to be an internal combustion engine expansion breaking connecting rod finished product. According to the machining process, parameters of mechanical properties such as the tensile strength, the yield limit, elongation and percentage reduction of area of the connecting rod are all increased to some extent, the mechanical properties of the connecting rod are improved on the whole, the tensile property and the impact resistance degree are greatly improved compared with those of existing materials, and the connecting rod can be well adapted to operating needs of high-power internal combustion engines.

The invention discloses an analysis method of installation point strength of an automobile sub-frame. The method comprises the steps that overall scanning is conducted on an automobile body-in-white and the automobile sub-frame to establish a finite element model according to scanning data obtained through scanning; multiple installation points between the automobile body-in-white and the automobile sub-frame are determined, and corresponding acceleration of gravity of each installation point under preset working conditions is obtained, converted into loads and loaded on each installation point respectively; the finite element model is solved to obtain strain values and regional stress values of each installation point, wherein the regional stress values are the stress on the automobile body-in-white within ranges of the installation points; when it is detected that the strain values are within preset strain ranges and the regional stress values are smaller than the yield limit of materials of an automobile, the outputting of the analysis data of the finite element model is confirmed. By means of the analysis method, it is ensured that strength data of each installation point conforms to preset standards, and the overall safety coefficient of a product is improved.

The present invention relates to a composite guide rail and a method for producing such a guide rail. Said guide rail is made like a railway track or the like and is intended to be guided in interaction with the wheels of the running means along the rail, said guide rail comprising: a long outer rail (4) made of sheet metal, the shape of which is is in the shape of a longitudinally open slot with a defined inner side (9) and outer side (10); a long bottom rail (5) with a rail bottom (1) for mounting the rail on one surface; a rail waist (2), It extends from the base of the rail supporting the main part (3), which is thicker than the rail waist and acts as a receptacle (11) for receiving and supporting the outer rail, which has a selected part to provide The outer contour of the interaction of the idler pulleys. According to the invention, the inner side (9) and the receiving part (11) of the outer rail (4) have opposite cross-sectional shapes, the yield limit of the outer rail (4) exceeds the yield limit of the bottom rail (5), and the two parts are bonded by gluing are joined together, for example by welding or gluing.

The invention relates to a method for preventing a lining plate of a ball grinder from cracking, which is suitable for improving the lining plate of the prior ball grinder and aims to enhance the yield limit of the lining plate of the ball grinder. The method adopts high manganese steel materials, such as ZGMn13Cr2Mo and ZG32Mn9SiCr2MoRe or ZGMn9Cr2ReSi, containing metallic elements, i.e. Cr, Mo, and the like to manufacture an end lining plate, a cylinder body lining plate and a grid lining plate of the ball grinder by a lost foam casting method and needs to carry out heat processing for cast and formed lining plates before the lining plates are installed to be used. The method comprises the following steps: firstly, placing the lining plates into a furnace to be heated to 200 DEG C-300 DEG C, and preserving the temperature of the lining plates for 1-2 hours; then heating the lining plates to 650 DEG C-680 DEG C according to the speed of 40 DEG C-50 DEG C/hour, and preserving the temperature of the lining plates for 4.5-5 hours; then heating the lining plates to 1060 DEG C-1090 DEG C according to the speed of 60 DEG C-70 DEG C/hour, and preserving the temperature of the lining plates for 3.0-4.0 hours; taking the lining plates out of the furnace, placing the lining plates into water to subject to water toughening processing, then placing the lining places into a tempering furnace to be heated to 300 DEG C-350 DEG C according to the speed of 40 DEG C-50 DEG C/hour, and preserving the temperature of the lining plates for 6-8 hours; then cooling the lining plates at the speed of 1.5-2.5 min/mm; tempering the lining plates into the furnace, and controlling the temperature of the lining plates below 150 DEG C.

The invention discloses a device and method for reducing and homogenizing the residual stresses of a complex component. The complex metal or nonmetal mechanical component with residual stresses distributed on the surface and interior are placed in a liquid fluid medium or soft medium with high-energy acoustic beams; the high-energy acoustic beams generated by high-energy ultrasonic transducer arrays radiate to the surface and interior of the complex structural component; alternating dynamic stresses and residual stresses, which are applied to residual stress concentration areas by high-energyelastic waves in the component, are superposed by means of focused scanning; and when the total of the stresses is greater than the yield limit of the material, the component generates plastic deformation, and finally the residual stresses inside the component are reduced and homogenized.

The invention relates to a method for designing a roller shape of a two-roller straightener concave roller and belongs to the technical field of two-roller straighteners. The method comprises the following steps that firstly, stress distribution of bar material straightening actual deformation is determined; secondly, a formula of a straightening reverse bending ratio is determined according to bar material straightening deformation characteristics; thirdly, on the basis, combining abrasion of straightening force on a roller face, residual stress and influence of an elastic core on hidden danger deflection, the reverse bending ratio of a roller lumbar segment is determined; finally, the reverse bending ratios of the roller lumbar segment and a roller thoracic segment are determined by a remnant curvature formula. The reverse bending ratios of all segments are related with the following variates : Cw = {delta, eta, sigma<t>, sigma<6> epsilon<t>}, wherein the delta is an elastic region ratio, the eta is a ratio of the maximum deformation stress to yield limit, the sigma<t> is the yield limit, and the sigma<6> epsilon<t> is the straightening maximum deformation stress corresponding to the <6> epsilon<t>. On the premise of ensuring the stable straightening quality, the straightening straightness accuracy of the bar materials is improved, the abrasion on the rollers is reduced, the import amount of foreign straightening rollers is reduced, and the enterprise cost is saved.

A collapse strength prediction method of a steel pipe includes deriving a prediction equation indicating a relationship among D/t obtained by dividing an outer diameter D (mm) by a thickness t (mm), material characteristics, a collapse strength dominant factor, and a collapse dominant proof stress (σ_CDOS) of the steel pipe using a plurality of reference steel pipes collapse whose strengths have been obtained in advance, obtaining D/t, material characteristics, a collapse strength dominant factor, and a predicted collapse strength of a steel pipe that is an evaluation subject, obtaining a compressive stress-strain curve in a circumferential direction of the steel pipe that is the evaluation subject, obtaining a stress that causes a permanent strain to be generated in the steel pipe that is the evaluation subject as the collapse dominant proof stress on the basis of the compressive stress-strain curve, and computing the predicted collapse strength of the steel pipe that is the evaluation subject from the D/t, the material characteristics, the collapse strength dominant factor, and the collapse dominant proof stress, which have been obtained, on the basis of the prediction equation, and the permanent strain is set according to a value of the D/t of the steel pipe that is the evaluation subject.