12results about How to "Control stress" patented technology

The invention provides a beam string structure optimization method for reinforcing a large-span steel corridor, and belongs to the technical field of building construction.The method comprises the steps that firstly, a three-dimensional finite element model is established, the three-dimensional finite element model comprises an upper steel corridor, vertical supporting rods and inhaul cables, and boundary conditions and dead load and live load are set; performing nonlinear analysis to obtain an initial deflection value and a stress value, and judging whether reinforcement requirements are met or not. And if not, adjusting the length of the supporting rod and the prestress of the inhaul cable, and repeatedly analyzing and calculating until the requirements are met. Then, the structural deflection serves as a control parameter, the strain of the inhaul cable serves as a response parameter, cable force optimization calculation is conducted through an SAP2000CSiLoadOptimizer toolbox, and an optimized strain value of the inhaul cable is obtained. And finally, according to an optimization result, a final cable force optimization scheme is obtained through back-stepping, and specific process parameters of the beam string structure for reinforcing the large-span steel corridor are determined. The problem that an existing method cannot comprehensively reflect the nonlinear mechanical property of the structure is solved.

The invention discloses a method for controlling the C-shaped warping defect of eighteen-roller single-stand high-strength steel, and belongs to the technical field of solving the C-shaped warping defect of a steel plate. The method comprises the following steps: carrying out hot rolling, acid pickling and eighteen-roller reversible rolling on a descaled plate blank of a casting blank, the roller diameter difference between the upper roller diameter and the lower roller diameter of the middle roller of the eighteen-roller reversible rolling mill ranges from 2 mm to 5.5 mm, and the lower roller diameter is larger than the upper roller diameter. According to the method for controlling the C-shaped warping defect of the eighteen-roller single-stand high-strength steel, the roughness of the working rollers, the roller diameter difference of the middle rollers, the rolling force of the rolling mill and the strip steel tension are strictly controlled, the plate shape and stress problems in the rolling process are effectively controlled, and finally the warping height is controlled to be within the range of + / -(0.35-0.5) mm / m.

The invention discloses a stress control method for plasma surfacing of an ultrahigh-hardness material, belongs to the field of welding additive manufacturing, can solve the problem that stress cracking is prone to occurring in the surfacing process of an existing high-hardness material, and particularly relates to a self-heating device for surfacing of rod and shaft parts and a surfacing process control strategy. The self-heat-supplementing devices are distributed on the two sides of a surfacing area, the solidification temperature of a welding layer arc stopping section is controlled in a heat transfer mode, the welding layer arc stopping section is slowly cooled after the temperature is homogenized, and the surfacing process control strategy mainly comprises the following steps that 1, cleaning is conducted, specifically, a cleaning agent is used for cleaning, and the cleaning area needs to be 60 mm outwards from a surfacing part; the cleaning agent does not contain elements causing alloy embrittlement; 2, the preheating temperature before welding is at least 350 DEG C or above; 3, the interlayer temperature is controlled to be 350-550 DEG C;

The invention discloses an in-situ heating pasty zone high-temperature mechanical property testing device. The device comprises a stretching device, a left furnace door, a furnace body, a connecting rod, a left water-cooling chuck, a micro-displacement sensor, a test bar, a thermocouple, an induction coil, a ceramic crucible, a heat preservation layer, a right water-cooling chuck, a rigid beam, a bearing beam, a right furnace door, a stress sensor, a vacuum device and a stretching device guide rail support. Under the high vacuum condition, the water flow of a water cooling chuck and the temperature of an induction coil are adjusted, the test bar is cooled to the set paste area temperature after being heated and melted, a stretching device is started, the stretching rate is controlled, and the high-temperature mechanical properties of the metal test bar at different temperatures, cooling rates and stretching rates are measured; the problem that a traditional mechanical property testing device cannot test the mechanical property of the metal when the metal is cooled to a pasty area after being heated or melted is solved, and the mechanical property data of the pasty areas of different metals are filled. The device can quantitatively and accurately test the high-temperature mechanical properties of the pasty zone of the metal under different conditions.

The utility model relates to the technical field of bending automatic mold penetrating devices, and discloses a bending automatic mold penetrating device which is characterized in that a sliding block penetrates through a sliding groove and is in sliding connection with the sliding groove, so that a rotating plate can drive an upper clamping block, a gasket and a lower clamping block to rotate together through a T-shaped rod and a threaded column when rotating, and the upper clamping block, the gasket and the lower clamping block are clamped in the sliding groove; when the size of the graphene copper wire is changed, a pressing plate can be pressed towards the middle, so that the pressing plate pushes a pressing rod, the pressing rod can push clamping plates to gather towards the middle, and when the clamping plates gather towards the middle, a hinge rod hinged to the bottom can be driven to move together; a hinge rod can rotate to a certain degree with a positioning shaft as a fulcrum, so that a clamping plate at the bottom of the hinge rod is not clamped into clamping teeth any more, a T-shaped rod can be pulled at the moment, an upper clamping block and a lower clamping block are driven to be far away from the upper clamping block and the lower clamping block in the middle through the T-shaped rod and a threaded column, and the bending distance is increased; and the stress of the graphene copper wire during bending can be better controlled.

The utility model relates to the technical field of danger removal of a danger water gate, and discloses a side slope protective surface reinforcing structure for danger removal and reinforcement of the danger water gate, which comprises a side slope, a side slope reinforcement cage is arranged on the slope surface of the side slope, a plurality of anchor cables are arranged on one side, close to the side slope, of the side slope reinforcement cage, each anchor cable comprises an anchor head, and a steel cable body is arranged at the top of each anchor head. A locking mechanism for preventing the steel cable body from being adjusted back is arranged on one side of the anchor head, the locking mechanism comprises a protective shell fixed to one side of the anchor head, a mounting groove is formed in the top of the anchor head, and rotating rods are rotationally connected to the two sides of the inner wall of the mounting groove. Under the action of the ratchet wheel and the pawl, the steel cable body can only move in one direction, and therefore stress loss caused by callback of the steel cable in the adjusting process is avoided. The stability and reliability of the anchor cable in the using process are guaranteed, the anchoring effect can be improved by effectively controlling the stress of the steel cable, and it is guaranteed that the structure is more stable under the load.

The invention belongs to but not limited to the technical field of metal-based composite materials, and discloses a layered titanium-based composite material with alternate soft and hard layers and a preparation method thereof.The surface of a TC4 titanium alloy matrix material is subjected to laser cleaning treatment, and an oxide film and impurities on the surface of the matrix are removed; tC4 soft layer cladding is conducted on the surface of the cleaned TC4 titanium alloy matrix in the pure argon atmosphere through the laser fuse technology; carrying out in-situ nitriding treatment on the prepared TC4 soft layer in an N2-Ar mixed atmosphere by utilizing a laser nitriding technology to obtain a TiN hard layer with a certain thickness; and circularly operating to obtain the layered titanium-based composite material with alternate soft and hard layers. According to the titanium-based composite material with the layered structure, the finally obtained composite material has the functions of high strength and light weight, has the advantages of being good in high temperature resistance, high in heat resistance, good in corrosion resistance, high in mechanical strength and the like, and is wide in application range.

The utility model relates to a tunnel primary support structure, which takes a wave-shaped retaining plate as a support main body, and the arrangement direction of wave crests and wave troughs of the wave-shaped retaining plate is arranged in the longitudinal direction of a tunnel, so that the wave-shaped retaining plate has the mechanical characteristic of small compression rigidity along the arrangement direction of the wave crests and the wave troughs; the longitudinal deformation and stress of the surrounding rock can be controlled; meanwhile, the annular displacement and stress generated by the surrounding rock are dynamically controlled through a special connection mode between the adjacent wave-shaped retaining plates in the retaining layer. That is to say, the supporting structure can dynamically respond to the deformation and stress of the surrounding rock from the longitudinal direction and the circumferential direction at the same time by means of the retaining layer formed by the wave-shaped retaining plates, and therefore the dynamic adaptability of the tunnel supporting structure can be improved, pressure can be evenly distributed, the self-bearing capacity of the surrounding rock can be effectively exerted, and the construction period can be shortened.

The application discloses a kind of solid wood board hot-pressing drying method, belong to timber processing technical field.Solid wood board hot-pressing drying method includes the following steps: solid wood board is placed on hot press;Hot press includes the upper pressing plate and lower pressing plate oppositely arranged along vertical direction, and left side pressing plate and right side pressing plate arranged along horizontal direction;Solid wood board is preheated;Upper pressing plate and lower pressing plate are heated to hot-pressing temperature;After upper pressing plate and lower pressing plate reach hot-pressing temperature, control upper pressing plate and lower pressing plate to exert radial pressure on solid wood board, left side pressing plate and right side pressing plate exert chordal pressure on solid wood board;When the moisture content of solid wood board reduces to below moisture content threshold, pressure is released and dried solid wood board is taken out.The application simultaneously exerts radial and chordal pressure during drying process, combined with the synergistic control of pressure and temperature, effectively controls wood deformation and stress during drying process, thereby inhibiting wood shrinkage, cracking and deformation problems.

The invention relates to the technical field of semiconductors, and particularly discloses a semiconductor laser structure with cyclic strain buffer layers and a P-type strain buffer layer, which comprises a contact layer, a P-surface limiting layer, the P-type strain buffer layer, a P-surface waveguide layer, an active layer, an N-surface waveguide layer, an N-surface limiting layer and a plurality of groups of cyclic strain buffer layers which are arranged in sequence, the material of the P-type strain buffer layer is AlaGa1-aInbP, and 0 lt; a < lt >; 1, 0lt; blt; 0.48, each group of cyclic strain buffer layers is provided with a strain layer and a buffer layer, the buffer layers are made of gallium arsenide, and the strain layers are made of Al < x > Ga < 1-x > In < y > P, xlt; 1, 0lt; yt; Yt; and 0.48, 3 to 50 groups of cyclic strain buffer layers are arranged. The laser epitaxial structure has the effect of improving the defect of serious warping caused by large pressure stress of the laser epitaxial structure.

The present application discloses a double-string 3D bent lower spring sheet assembly for VCM motors, which is composed of four lower spring units arranged in pairs and in a central symmetric manner. The lower spring unit is composed of a vertical spring sheet unit and a horizontal spring sheet unit that are integrally formed and connected to each other at 90° bends; the horizontal spring sheet unit is arranged on one side close to the inner wall of the vertical spring sheet unit, and the two ends are connected to the vertical spring sheet unit through double-string spring sheets to form an integrated structure. The double-string design adopted in the present application can avoid the problem that it is difficult to achieve strength and stress balance in a single-string structure. If the width is too wide, the resistance generated by the lower spring sheet will be large, and the design stress cannot be adjusted to the yield stress of the spring raw material, and the focal length adjustment effect is poor; if the string width is designed to be too small, the elastic coefficient of the spring will not meet the design requirements and cannot meet customer needs. At the same time, if the spring wire is too small, it is easy to break the wire during installation and use.

The invention provides a cylinder section end face welding shape maintaining device. The cylinder section end face welding shape maintaining device comprises a front welding face shape maintaining module, a lower-layer cylinder section shape maintaining module, an upper-layer cylinder section shape maintaining module, a welding face clamp and a welding operation table. A front-end shape-preserving device, a rear-end shape-preserving device and a welding operation table are arranged on the workbench, the two ends of a barrel section to be welded and machined are clamped through the front-end shape-preserving device and the rear-end shape-preserving device respectively, and the welding operation table is arranged at the position close to the front-end shape-preserving device; through cooperation of the front welding surface shape-preserving module, the lower-layer cylinder section shape-preserving module, the upper-layer cylinder section shape-preserving module and the welding surface clamp, shape-preserving and stress release in the welding process are accurately controlled by designing clamping point positions and controlling clamping force and clamping amplitude, the welding quality of a large-size cylinder is improved, and the welding quality of the large-size cylinder is improved. And finally, welding of the cylinder section assembly is achieved.