14 results about "Plastic bending" patented technology

The embodiment of the present application provides a bending shear type eccentrically braced energy dissipation beam and an eccentrically braced member, the bending shear type eccentrically braced energy dissipation beam comprises a first beam segment, a second beam segment and a third beam segment sequentially connected along a first direction, when shear plastic deformation strengthening of an energy dissipation beam web of the second beam segment and a shear shear force internal force reach mu times of full plastic shear bearing capacity, the first beam segment and the third beam segment reach full plastic bending bearing capacity; or when plastic deformation strengthening of an energy dissipation beam first flange and an energy dissipation beam second flange of the first beam segment and the third beam segment and an energy dissipation beam first flange and an energy dissipation beam second flange of the third beam segment and a bending bending moment internal force reach mu times of full plastic bending bearing capacity, the energy dissipation beam web of the second beam segment reaches full plastic shear bearing capacity; wherein mu is a constant with a value range of 1.1-1.25. The bending shear type eccentrically braced energy dissipation beam of the embodiment of the present application has better seismic performance.

The invention discloses a thin plate end pre-curling method and device based on involute curvature, and the method comprises the steps: building an involute curvature model, and designing an up-down opposite-pressing type extrusion device composed of a plurality of extrusion modules with curvatures arranged along an involute in a segmented manner based on the involute curvature model; positioning the end part of the thin plate at a position corresponding to the target curvature in the extrusion device; the extrusion device is driven to be closed, so that the end of the thin plate is subjected to continuous plastic bending along an involute track; the pre-curling curvature is compensated according to the springback characteristic of the thin plate material; and the pre-curled thin plate is fed into a plate rolling machine to be integrally rolled, and the curvature of the ends is continuous and consistent with the curvature of the cylinder body. By means of the characteristic that the curvature of the involute continuously changes from small to large, elastic springback in the pre-bending process of the end of the high-springback material can be effectively reduced, straight edges of the end after edge rolling are remarkably reduced, and the overall roundness of the cylinder and the welding assembly quality are improved.

The invention discloses a discrete element method for representing elastic-plastic fiber deformation, and belongs to the field of computational mechanics and numerical simulation. According to the method, to-be-analyzed elastic-plastic fibers are divided into ideal elastic-plastic fibers and damaged elastic-plastic fibers, for different types of elastic-plastic fibers, a bonded ball model is adopted to represent fiber dynamic characteristics, and a bending moment-bending angle analysis model of elastic-plastic bonds is established by integrating cross section stress of the bonds in the fibers; and further constructing a bending moment increment model at any bending angle, and simplifying by adopting a piecewise linear method to obtain a simplified model of the elastic-plastic key bending moment-bending angle relationship, so as to obtain the deformation characteristics of the to-be-analyzed elastic-plastic fiber. According to the discrete element model capable of representing the elastic-plastic bending deformation of the fibers, accurate description and piecewise linear simplification of nonlinear mechanical behaviors of the fiber materials are achieved, and the calculation efficiency is remarkably improved while the calculation precision is guaranteed.

The utility model relates to the technical field of glass fiber reinforced plastic production, and discloses a glass fiber reinforced plastic bending machine for producing a glass fiber reinforced plastic storage tank, which comprises an operation table, a supporting plate is arranged at the bottom of the operation table, a plurality of bottom supporting seats are arranged at the bottom of the supporting plate, and a top fixing plate is arranged at the top of a telescopic plate. A bending device is arranged at the top of the top fixing plate, a clamping assembly is arranged on the outer wall of the operation table, a bending table is arranged on the side, close to the clamping assembly, of the outer wall of the operation table, and the bending table comprises a plurality of rotating plates located on the outer wall of the operation table. The outer wall of the limiting bolt is connected with a spring through a connecting column, the situation that deviation is likely to be caused due to the fact that the limiting bolt cannot be fixed during bending is prevented, when the rotating plate rotates, the spring on the outer side is stretched outwards under tension, the tension disappears, the spring automatically resets, glass fiber reinforced plastic is fixed during bending, and meanwhile, low efficiency caused by manual restoration is reduced through automatic restoration of the structure.

A kind of stamping forming welded sewage pump impeller and processing method.It relates to sewage pump impeller technical field.Solve the problems of many manufacturing defects,high production cost,convenient maintenance and low material utilization rate in prior art casting impeller.The present application includes hub and back cover plate,at least two blade assemblies are uniformly distributed on the surface of the back cover plate;Blade assembly includes inlet edge cylinder,blade and filler,blade is composed of pressure surface and back surface,pressure surface,back surface and inlet edge cylinder form a hollow cavity;Filler is arranged in the hollow cavity.The impeller of the present application realizes active non-destructive dynamic balance compensation,changes the traditional subtraction thinking of relying on polishing surface to remove weight.Introduce the elastic-plastic bending analytical model based on material yield strength and elastic modulus,realize high-precision forming.The hollow blade of the present application reduces weight and increases efficiency,positioning is reliable by welding,anti-winding,anti-abrasion,anti-deformation ability is stronger,manufacturing flexibility is maintained,with economy.

The application relates to a shear strain-based anchor rod failure simulation method. The method comprises the following steps: establishing a pile structure unit in numerical simulation software; monitoring the displacement of each node in a local coordinate system along a y direction and a z direction and the length of each element structure component in the pile structure unit by using a FISH function; calculating shear strain according to the displacement along the y direction and the z direction and the length of the element structure component; judging whether the shear strain is within a plastic shear strain and a limit shear strain range, if yes, setting the plastic bending moment of the unit as the measured bending moment of the unit when the shear strain is equal to the plastic shear strain; finally, judging whether the shear strain exceeds the limit shear strain, if yes, setting the plastic bending moment and the limit tensile strain of the unit as positive values which tend to 0. The stress stage of the anchor rod can be adjusted according to the shear strain size.

The utility model relates to the technical field of pipe machining, in particular to a pipe thermoplastic bending device which comprises a base and a clamping mechanism. Two cylinder bodies which are symmetrically distributed are arranged above the base; the clamping mechanism comprises two clamping plates arranged in the cylinder, a threaded sleeve arranged on the cylinder, a threaded rod in threaded connection with the threaded sleeve, a connecting base arranged on the clamping plates, a clamping ring, a rotating wheel and two guide rods, wherein the clamping ring and the rotating wheel are arranged at the two ends of the threaded rod respectively, and the guide rods are distributed on the clamping plates left and right. The two clamping plates are in an arc shape and are symmetrically distributed, the clamping ring is rotationally arranged in the connecting base, and the guide rod penetrates through and is slidably connected to the barrel. According to the pipe bending device, the pipe can be kept stable in the bending process, the clamping mechanism can be matched with the bending device to conduct corresponding deflection, and the machining quality of the pipe is guaranteed.

The present application relates to the technical field of laser processing, and discloses a pipe deformation adaptive compensation laser cutting equipment and method based on machine vision, which comprises the following steps: controlling a visual detection module to scan a pipe section to extract a geometric center coordinate, combining a feeding position and a rotation angle to construct an initial deformation topology array; extracting a total center deviation vector and separating it into a plastic bending vector and an initial elastic droop vector; analyzing a processing program code to calculate a dynamic section inertia moment to generate a stiffness attenuation coefficient, combining a supporting wheel state to generate a dynamic beam span correction coefficient; and calculating a targeted processing center coordinate according to the above vectors and coefficients to control a machine tool to compensate processing. By decoupling inherent bending and elastic droop, and quantifying the stiffness weakening caused by material removal for feedforward compensation, the error caused by traditional overall compensation is avoided, and the cutting precision and end stability are ensured by preventing the risk of collision of the cutting head when the pipe is close to breaking.

The application provides an adjustable wall leveling system and a mounting method thereof. The adjustable wall leveling system comprises an adjustable cushion pipe, a top plate, a bottom plate and two plastic side plates which are enclosed into a closed pipe body, the plastic side plates are connected between the top plate and the bottom plate, the plastic side plates are plastically bent under external force to adjust the distance between the top plate and the bottom plate, the adjustable cushion pipe is nailed on the wall through the air gun; a keel plate is connected to the top plate; a wall plate is connected to the keel plate, and the keel plate is located between the top plate and the wall plate. In the application, the adjustable cushion pipe is provided in a hollow tubular structure and with plastic side plates. The distance between the top plate and the bottom plate can be adjusted by knocking, and then the adjustable cushion pipe height can be adjusted. Compared with the traditional technology of heightening by wood blocks, the thickness does not need to be recut, the operation is simple and convenient, the durability is stronger, the height adjustment precision is higher, and the millimeter level precision requirement can be met.

The invention relates to an anchor rod failure simulation method based on shear strain. Comprising the following steps: establishing a pile structure unit in numerical simulation software; monitoring the displacement of each node in the y direction and the z direction in the local coordinate system and the length of each elementary structural member in the pile structural unit by adopting a FISH function; calculating shear strain according to the displacements in the y direction and the z direction and the length of the elementary structural member; judging whether the shear strain is within the range of plastic shear strain and limit shear strain, and if so, setting the plastic bending moment of the unit as the actually measured bending moment of the unit when the shear strain is equal to the plastic shear strain; and finally, judging whether the shear strain exceeds the limit shear strain or not, and if so, setting the plastic bending moment and the limit tensile strain of the unit as positive values tending to 0. And the stress stage of the anchor rod can be adjusted according to the shear strain.

The invention relates to the technical field of motor home frame manufacturing, in particular to a preparation method of a pre-bent longitudinal beam of a frame, the pre-bent longitudinal beam and the motor home frame. The preparation method comprises the following steps: continuously rolling and forming a strip-shaped metal raw material to form an integrated longitudinal beam with a target section; accumulative plastic bending in the length direction of the longitudinal beam is applied to the longitudinal beam through the adjustable eccentric bending roller, so that the longitudinal beam synchronously forms continuous upward arch-shaped pre-bending; enabling the longitudinal beam to pass through a shaping roller frame to stabilize an arch-shaped pre-bent curve; the arch height of the arch-shaped pre-bending is detected in real time, the eccentricity of the adjustable eccentric bending roller or the roller gap of the shaping roller frame is adjusted according to the detected arch height deviation, and springback is compensated; and performing fixed-length cutting on the longitudinal beam. Quantitative controllable pre-bending is synchronously completed in the one-time forming process of the longitudinal beam, follow-up shape correction and welding finishing are not needed, the shape line consistency and the material performance integrity of the left longitudinal beam and the right longitudinal beam are guaranteed, and the vehicle driving stability and the structure durability are improved.

This invention provides an eccentrically supported energy-dissipating beam and supporting structural members. The eccentrically supported energy-dissipating beam includes a first beam segment, a second beam segment, and a third beam segment connected sequentially along a first direction. When the web of the energy-dissipating beam in the second beam segment undergoes shear plastic deformation strengthening and its shear bearing capacity reaches μ times the fully plastic shear bearing capacity, the first and third beam segments reach the fully plastic bending bearing capacity, where μ is a constant ranging from 1.1 to 1.25. This ensures that during an earthquake, the web of the energy-dissipating beam in the second beam segment undergoes shear yielding plastic deformation first, followed by plastic deformation of the first and second flanges of the energy-dissipating beams in the first and third beam segments. Therefore, the eccentrically supported energy-dissipating beam of this invention has better seismic performance.

The application discloses a bending damper, which comprises a pair of I-shaped steel for plastic bending resistance, a pair of flange plates of the I-shaped steel being arranged in parallel opposition and leaving a space in the middle; a pair of shear steel plates for elastic shear resistance, each of the shear steel plates being fixedly connected with inner side plates and outer side plates arranged in parallel opposition on both sides, and the pair of shear steel plates being fixedly connected with both ends of the pair of I-shaped steel through the inner side plates; and a pair of connecting plate assemblies for connecting a building main body and being fixedly connected with the outer sides of a pair of flange plates of the pair of I-shaped steel which are away from each other. The bending damper mainly utilizes the combination of the shear steel plates and the I-shaped steel, cancels the arc energy dissipation section of the ring-shaped metal damper, and is more convenient to process and manufacture. Moreover, the I-shaped steel has greater plastic bending resistance bearing capacity, and thick steel plates are not needed to meet the yield force requirement of the damper.