61 results about "Ovality" patented technology

The invention discloses a method for calculating stress and deformation of a roller carrier supporting thin-walled cylinder under the action of dead weight, which comprises the following specific steps of: S1, calculating the bending moment and deflection of a cylinder body in the longitudinal direction by adopting an overhanging beam model in the longitudinal direction, and determining the optimal position of the roller carrier in the longitudinal direction according to the maximum bending moment minimization and the maximum deflection minimization of a beam; s2, transversely utilizing symmetry to establish a semicircular curved beam model, and calculating bending moment and displacement in a transverse plane of the cylinder by adopting a Temosinke beam theory; s3, calculating the maximum stress in the cylindrical surface according to the in-surface bending moment, and determining the optimal half wrap angle required by the strength; and S4, calculating the ovality and root-mean-square roundness of the curved beam according to the displacement, and determining the optimal half wrap angle required by deformation. According to the method, the maximum stress and the deformation shape of the thin-walled cylinder are accurately predicted, and the optimal wrap angles of the roller carrier under the strength requirement and the deformation requirement can be determined to be 67.4 degrees and 90 degrees respectively, so that the optimal wrap angle is suggested to be between 67.4 degrees and 90 degrees in engineering.

The invention relates to the technical field of industrial nondestructive testing, in particular to a wall thickness detection device and method based on a dual-ray system, and the method comprises the steps: synchronously shooting vertical and horizontal projection images of a pipe through a dual-ray source; extracting first line gray data of the bidirectional projection image, and capturing an edge position through an automatic threshold method; grabbing inflection points of the inner wall and the outer wall of the pipe according to the edge position, and totally obtaining eight inflection points; calculating inner and outer diameters of the pipe by using a mathematical model based on the inflection point position Calculating the wall thickness, the ovality, the eccentricity value and the concentricity according to the inner diameter and the outer diameter; according to the invention, full detection in the pipe production process is realized, the detection efficiency is high, the influence of slight shaking of the pipe can be resisted, the detection result is accurate, and the device is suitable for detecting the wall thickness and related quality indexes of linear materials such as PVC pipes and cables.

The invention relates to the technical field of equipment state monitoring, in particular to an equipment state monitoring and maintenance system, and provides the following scheme: acquiring three-dimensional stress energy density distribution data of a roller bearing seat, predicting a roller surface microcrack expansion trend, and generating a dynamic residual life index; rolling force compensation is carried out by combining the ellipticity data of the section of the pipe; meanwhile, by synchronously collecting Barkhausen noise signals and cooling medium flow data, the cooling intensity is adjusted in real time; in order to ensure the roller health, a roller health weight is generated based on the dynamic residual life index, a rolling force compensation model is constructed, rolling force distribution is optimized through a particle swarm optimization algorithm, and the uniformity of the wall thickness of the pipe is ensured; the method effectively prevents roller damage and pipe wall thickness mutation, improves the production efficiency and the product quality, and prolongs the service life of equipment.

The invention relates to the technical field of clamping tools, in particular to a clamping device for a cylindrical thin-wall precision component, which comprises a supporting unit, a bracket, a positioning unit, a positioning mechanism arranged in the bracket, a clamping unit and a clamping mechanism arranged on the positioning mechanism, the inflating mechanism is arranged on the clamping mechanism and is used for preventing the part from being clamped and deformed; balance of deformation prevention and stable clamping is achieved through flexible contact and self-adaptive air pressure adjustment, an elastic cushion and an air inflation bag cushion are arranged in the clamping mechanism, a self-adaptive adjusting structure is formed by matching with an air inflation mechanism, it is guaranteed that the static friction force is enough to prevent parts from sliding, and the clamping effect is good. According to the clamping device, the clamping force is reduced, sinking, ovality out-of-tolerance or inner wall plastic deformation caused by too large clamping force are avoided, the problems of deformation and the like of components in the machining and clamping process can be effectively avoided, the product rejection rate is further reduced, and the actual machining efficiency is further improved.

The invention belongs to the technical field of scanning measurement, particularly relates to a cable outer diameter and ovality measurement method and system based on line laser contour scanning, and aims to solve the technical problem of low measurement precision caused by the fact that an existing algorithm is sensitive to noise, asymmetry of light strips and contour discrete points. The measurement method comprises the following steps: S1, performing anisotropic Gaussian filtering on a pixel according to a local tangential direction of a preliminary center line; s2, calculating a second derivative value and a third derivative value of the sub-pixel center point in the normal direction; s3, performing initial weighted least square ellipse fitting by using the corrected contour point set and the corresponding fitting weight to obtain parameters of an initial ellipse; and S4, based on the lengths of the long axis and the short axis of the fitting ellipse, calculating to obtain the outer diameter and the ellipticity of the cable. According to the measurement method, the interference of abnormal data points introduced by local flaws such as oil stains and scratches on the surface of the cable is eliminated, and the accuracy and the stability of a fitting result are improved.

The invention relates to a high-precision dynamic control method for wires and bars and a four-roller reducing and sizing rolling system, and belongs to the technical field of steel rolling. Aiming at the problems of insufficient dimensional precision, surface defects and low ovality of the existing two-roller and three-roller reducing and sizing mill, the invention provides a scheme for integrating a reducing rolling mill unit and a four-roller sizing mill, the single-pass compression ratio of the reducing rolling mill is 1.10-1.35, the single-pass compression ratio of the four-roller sizing mill is 1.001-1.10, and + / -0.001 mm precision control is realized by combining a dynamic roll gap adjusting system. Through an ellipse-circle-multi-section arc pass system, a roll gap compensation algorithm and Ki integral, the dimensional deviation is corrected in real time, finally, the dimensional precision of a finished wire and bar reaches + / -0.05 mm, the ovality is smaller than 0.05, the rolling speed is 140 m / s and 25 m / s at most, the service life of a roll collar is prolonged by 30%, and the production cost is reduced by 15%.

The invention discloses a steel pipe processing ovality detection device in the technical field of steel pipe processing, and the device comprises a centering unit which comprises a grip, a first limiting part which is disposed at one side of the top end of the grip and is of a circular ring structure, and a second limiting part which is disposed at the other side of the top end of the grip and is symmetrical to the first limiting part. The transmission part is rotationally connected between the first limiting part and the second limiting part in a sleeving mode, and the centering parts are distributed in a surrounding mode with the axis between the first limiting part and the second limiting part as the circle center. By means of the three sets of centering components capable of simultaneously gathering and clamping inwards, three non-collinear supporting points can be arranged on the outer diameter of the steel pipe, a stable triangular structure is formed, the overall stability of the device is enhanced, meanwhile, the three sets of supporting points can achieve the three-point centering effect, the center position of the steel pipe can be determined more accurately, and the machining precision of the steel pipe is improved. Measurement errors are reduced, and the accuracy of ovality measurement data is improved.

The invention relates to the technical field of ovality correction, and specifically discloses an ovality correction device, comprising an inner ring of a wind turbine bearing, wherein a positioning module is arranged in the middle of the inner ring of the wind turbine bearing. When the inner ring of the wind turbine bearing needs to be corrected for ovality, the positioning module is used to place the device at the central part of the inner cavity of the inner ring of the wind turbine bearing, so that an ovality detection module contacts the inner ring of the wind turbine bearing, and a rotating module is used to rotate the ovality detection module on the outer wall of the inner ring of the wind turbine bearing for one circle, and the ovality of the inner ring of the wind turbine bearing is detected by the ovality detection module. When the ovality exceeds a standard, the rotating module rotates the ovality detection module again to a position with a maximum diameter, and the inner ring of the wind turbine bearing is corrected for ovality by a correction module. During the correction, a correction amplitude is monitored by a secondary laser rangefinder and a secondary reflector to prevent cracks in the inner ring of the wind turbine bearing caused by a large extrusion amplitude at one time.

The invention discloses a method for reducing heat treatment deformation of a bearing ring through a temperature field shielding tool. The method aims at solving the problem that the bearing ring deforms in the heat treatment process. The method for reducing the heat treatment deformation of the bearing ring comprises the following steps: 1, carrying out a heat treatment test on a bearing ring sample, taking a deformed long axis position of the bearing ring sample after heat treatment as a mark position of other bearing rings, flatly placing the bearing ring on a material frame, and symmetrically placing two shielding tools at the mark position of the bearing ring; thirdly, when the steel bearing ring is a thick-wall ring or a thin-wall ring, different shielding tools are used; and 4, the material frame containing the steel bearing ring and the shielding tool is put into a vacuum furnace to be subjected to vacuum quenching treatment. The shielding tools of different shapes and sizes are designed, the placing mode of the tools is optimized, and the test result shows that by adding the shielding tools, the ovality of the inner diameter of the ferrule is reduced by 113 microns, and the ovality of the outer diameter of the ferrule is reduced by 118 microns.

The invention relates to the field of cable twisting assemblies, and provides a twisting assembly with tension dynamic compensation in order to solve the problem that the existing twisting assembly is difficult to effectively solve the problem that the stability of cable performance is reduced due to single-wire errors, and the twisting assembly comprises a twisting disc, a twisting collection piece, an ovality detection mechanism and a tension adjusting mechanism, the twisting disc is provided with a center hole and peripheral holes surrounding the center hole. The twisting collection member is provided with a through hole. The ovality detection mechanism is arranged on one side, far away from the twisting disc, of the twisting collection piece; the tension adjusting mechanism is used for adjusting the tension of the stranded wire. According to the invention, through the movable ovality detection mechanism, the ovality of the cable is detected in real time, and the tension of the stranded wire is dynamically compensated through the real-time detection result, so that the stability of the product performance, especially the resistance stability, is ensured; the dynamic detection of the ovality detection mechanism not only can obtain the ovality of the cable and deviated stranded wires, but also can reduce the influence of temperature change on the final ovality of the cable, and improves the accuracy of the detection result and the dynamic compensation process.

The invention relates to an automatic pressure quenching die for disc spring and wave spring products, relates to the technical field of machining dies, and solves the problems that when an existing pressure quenching die is used for machining disc springs and wave springs, product positioning is poor, formed products have the defects of deviation and large ovality, and the rate of finished products is low. A forming die cavity is formed in the lower die, circulating cooling water tanks are formed in the opposite side faces of the upper die and the lower die, a positioning assembly is arranged in the forming die cavity and comprises a positioning disc and an expansion and contraction piece, the positioning disc is defined by at least two positioning blocks, and the at least two positioning blocks are arranged in the forming die cavity in a radial sliding mode; the expansion and contraction piece is used for driving the at least two positioning blocks to realize expansion and contraction movement; the device has the advantages that the purpose of automatically aligning the concentricity of the disc spring or the wave spring and the forming die cavity is achieved, the consistency of the sizes of products formed through pressure quenching can be guaranteed, the problems of deviation, ovality and the like are solved, and the machining quality is improved.

The invention discloses a plastic pipe extrusion on-line ovality detection and correction method and device, and belongs to the technical field of plastic pipe forming. Comprising the following steps: S1, pipe surface data measurement: driving a turntable to rotate around a pipe, and synchronously measuring distance and temperature through a displacement sensor and a temperature sensor on the turntable; s2, ellipticity calculation: calculating the real-time ellipticity and the distribution orientation of the pipe based on the distance data; s3, temperature partition calculation: calculating the average temperature and the temperature difference of each fan-shaped partition of the pipe based on the temperature data; and S4, ellipticity closed-loop regulation and control: associating the distribution orientation of the ellipticity with the temperature parameters of the corresponding subareas, and differentially adjusting the cooling parameters of the corresponding subareas on the setting machine so as to actively correct the ellipticity. According to the method, the ellipticity and the circumferential temperature are measured synchronously on line, and partition regulation and control are implemented based on'temperature-deformation 'association, so that closed-loop quality control from passive detection to active prevention is realized.

1. Name of the design product: Cable deviation detector. 2. Use of the design product: Used for measuring the wall thickness, eccentricity, diameter and ovality of multi-layer or single-layer cross-linked cables. 3. Design key points of the design product: Lies in the shape. 4. Picture or photo that best shows the design key points: Perspective view 3.

The invention discloses a shield tunnel ovality detection method, which belongs to the technical field of tunnel engineering detection, and comprises the following steps: S10, fitting the circle center of a shield shell: carrying out multi-point measurement on the shield shell by adopting a total station, and carrying out circle center fitting by adopting fitting software; s20, performing calculation through a circle center measuring point: performing theoretical calculation on the inner diameter of the shield shell of the shield tunneling machine and the fitting circle center to obtain a theoretical coordinate point passing through the circle center; carrying out on-site lofting on the theoretical coordinate points to obtain coordinates passing through the circle center, and marking the coordinates; s30, data correction: measuring the data difference between the theoretical coordinate point of the total station and the shield shell distance, and taking the data difference as the correction value of the ellipticity deformation of the shield shell; s40, data measurement: according to the positions of the marked measurement points, measuring the position from the shield shell to the duct piece after the duct piece is installed each time; and S50, calculating the ovality. The problems that a total station and a profiler are difficult to measure due to no intervisibility effect, the measurement difficulty is large, and the segment installation efficiency is affected are solved.

The invention relates to the technical field of metal ring piece plastic forming, and discloses a single-side radial limitation shape correcting method for a ring piece with an elliptical inner diameter and an elliptical outer diameter. Aiming at the problem that the size is out of control due to a single-side free state in the existing bulging / reducing process, the method adopts an alternate constraint strategy: locking the outer diameter through reducing or locking the inner diameter through bulging according to the ovality difference of the inner diameter and the outer diameter; the method specifically comprises the steps that the ring piece is placed between expansion and shrinkage dies, the hole shrinkage process and the bulging process are executed in batches, and after deformation each time, die loading on one side is kept to restrain deformation of the free side; wherein the reducing displacement delta is 0.05%-0.5% of the outer diameter of the ring piece, and the rotation angle alpha is 10-60 degrees. Through a discrete fan-shaped mold and a dynamic constraint mechanism, the problems of ovality intensification, mold pasting failure and stress concentration in a traditional process are solved, the roundness of the ring piece meets the requirement, and the yield of the large thin-wall ring piece is greatly improved.

A method for controlling ovality during production of a round billet by using a continuous casting machine. The method comprises the following steps: step 1, determining the total reduction amount of a round billet on the basis of a total reduction amount calculation formula, wherein the total reduction amount calculation formula is: H=D×3.0%; and step 2, distributing the total reduction amount to appropriate withdrawal and straightening machines for reduction implementation, and determining the withdrawal and straightening machines for implementing a reduction operation from among a plurality of withdrawal and straightening machines (1), and reduction amounts thereof. Reduction amount control and a displacement control mode ensure that the ovality of round billets is controlled within 3.0%, so as to meet the standard requirement of less than 3.5%, so that all the round billets can meet the ovality requirement during production.

A paperboard winding tube (10) of enhanced compression stiffness and resistance to deformations leading to ovality under gravity type loading is disclosed. The paperboard winding tube (10) may include a cylindrical body wall (12) formed from a plurality of structural paperboard layers (30-40) with at least one central structural paperboard layer (34, 36) disposed between at least one radially inward structural paperboard layer (38, 40) and at least one radially outward structural paperboard layer (30, 32). The radially inward and the radially outward structural paperboard layers (30, 32, 38, 40) may be formed of a paperboard ply of a first stiffness, and the central structural paperboard layer (34, 36) may be formed of a paperboard ply of a second stiffness that is less than the first stiffness. The arrangement of the plurality of structural paperboard layers (30-40) increases the compression stiffness of the paperboard winding tube (10) to resist deformations leading to ovality of the cylindrical body wall (12) under gravity ty pe loading of the paperboard winding tube (10).

The present application relates to the technical field of welded pipe end measurement, and discloses a small-caliber pipe end rapid measurement device, which comprises a clamping seat capable of being clamped in a measured pipe and a rotating frame rotatably installed on the clamping seat, and a rotating plate left side is provided with at least two rings of positioning pin rings arranged from inside to outside in sequence, each ring of positioning pin rings comprises N positioning pins uniformly distributed along the circumferential direction around the central axis of the fixed shaft, N is an even number, and a pipe end accommodating space of the measured pipe is formed between the two rings of positioning pin rings. The present application has reasonable and compact structure, is convenient to use, can rapidly measure whether the pipe end inner diameter, pipe end straightness, pipe opening flatness, pipe opening ovality and other parameters of the welded pipe exceed the standard, greatly shortens the pipe end measurement operation time, improves the measurement efficiency, and can use the clamping seat and the rotating frame corresponding to the actual measured pipe specification size according to the pipe specification size combination, has strong use flexibility, and has the characteristics of simple use, high efficiency and convenience.

The present invention discloses an implementation method for simultaneously restoring the uplift deformation and horizontal deformation of a tunnel, comprising the steps of: performing numerical simulation before excavating a foundation pit to obtain the positions and sizes of vertical grouting holes and the positions and sizes of inclined drilling holes in the unloading hole area located below the existing tunnel; preparing a grouting device and a hole-expanding drill bit; drilling holes; inserting the grouting device into each vertical grouting hole; excavating the foundation pit inside the diaphragm wall, and simultaneously observing the displacement monitoring devices at the monitoring points installed on the inner wall of the existing tunnel and the track bed. If a certain ring of segments generates displacement and deformation, grout is injected into the vertical grouting hole corresponding to the position of this ring of segments, and at the same time, hole-expanding construction is carried out at the bottom of the inclined drilling hole corresponding to the position of this ring of segments by using the hole-expanding drill bit. When the horizontal displacement, vertical displacement, and ovality of the tunnel are restored to the set values, stop grouting and drilling. By using this method, the recovery rate of the vertical rigid body displacement is close to 0.4.

The utility model belongs to the technical field of detection, and particularly relates to a device for detecting the inner diameter ovality of a large-diameter ring piece, which is used for accurately finding the position of a central shaft of the ring piece by accurately moving a stand column in the longitudinal direction and the transverse direction, so that the ring piece can be generally positioned when being hoisted and placed, and the hoisting operation is convenient. The crawling supporting part slides up and down on the stand column body, the diameters of different height positions can be measured, and the device is suitable for measuring the ellipticity of the inner diameter of a large-height ring piece. In addition, the wireless communication module is connected with a remote controller, remote operation can be carried out, personnel do not need to approach, the device can be used for measuring normal-temperature ring pieces and thermal-state ring pieces, and the manual measurement environment is improved. The device is simple in structure, convenient to operate, low in cost and high in applicability, and makes a great contribution to production cost control.

The utility model relates to the technical field of circular part ovality detection, and one embodiment of the utility model provides a circular part ovality detection device which comprises a positioning block arranged on a main body, the positioning block is provided with a clamping groove, and the clamping groove is used for abutting against the side wall of a circular part; the sliding block is arranged on the main body in a sliding manner and is close to or far away from the clamping groove after sliding; the dial gauge is arranged on the sliding block and provided with a measuring head, and the measuring head faces the circular part. According to the technical scheme, the technical problem that the position adjusting distance of the dial gauge is limited in the prior art is solved.

The utility model provides a non-contact type inner diameter measuring instrument. The non-contact type inner diameter measuring instrument comprises a placement mechanism arranged on a supporting table top and a detection mechanism capable of extending to the placement mechanism. The placing mechanism comprises a placing disc capable of driving a to-be-detected steel ring to rotate, the to-be-detected steel ring and the placing disc are concentrically placed, and the detection mechanism moves in the radial direction according to the diameter of the to-be-detected steel ring with the circle center of the placing disc as the datum point and is used for scanning the upper end face and the lower end face of the to-be-detected steel ring on the placing disc. The utility model has the beneficial effects that on the basis of ensuring that the steel wire ring does not deform, the inner wall and the outer wall of the steel wire ring can be scanned and measured, the data of the inner perimeter, the outer perimeter, the thickness and the ovality of the steel wire ring can be obtained at the same time, the instrument is convenient to operate, and the detection efficiency is improved.

The invention relates to the field of perpendicularity detection devices, in particular to a construction hole perpendicularity detection method and a construction hole perpendicularity detection device.According to the construction hole perpendicularity detection method, periodic length changes are applied to a vertical line, so that a suspended spherical hammer body generates limited displacement response in a hole; according to the method, effective data with a high signal-to-noise ratio can still be obtained under the condition of an extremely small annular gap, accurate detection of the deflection direction and the inclination angle of the axis of the construction hole is achieved, the detection process is simplified, the detection efficiency and reliability are improved, and the method is suitable for popularization and application. According to the construction hole perpendicularity detection method, the problem that the detection result is unstable and inaccurate due to the fact that single static vertical line reading is depended on and is easily influenced by hole wall ovality, water flow disturbance, wire friction and environmental noise in the prior art is solved.

The invention discloses a large offshore wind power barrel structure pocket-pulling hoisting process optimization method which comprises the following steps: S1, aiming at a wind power barrel hoisting process, establishing a mechanical model considering material characteristics and steel wire rope characteristics; s2, calculating a theoretical pocket-pulling wrap angle to obtain in-plane axial force, shearing force and bending moment distribution of the cylinder in the pocket-pulling hoisting process, and predicting a risk position in the hoisting process through an actual wrap angle; s3, calculating the radial displacement of the barrel at each angle, and calculating the absolute ovality and the relative ovality of the wind power barrel according to the solved radial displacement; s4, based on the wind power cylinder hoisting longitudinal simplified mechanical model, calculating a theoretical pocket pulling hoisting position, and forming a calculation algorithm for accurately pre-judging a reasonable hoisting position; and S5, calculating a theoretical pocket-pulling hoisting inclination angle, and determining the maximum inclination angle under pocket-pulling hoisting. According to the invention, by optimizing the pocket-pulling hoisting scheme and reasonably arranging the hoisting position, the hoisting wrap angle and the hoisting dip angle, the risks of slipping, overturning and the like possibly occurring in the hoisting process are effectively reduced.

The application discloses a kind of synergic control methods of hot-rolled plate tail fish tail defects, belong to the technical field of steel rolling process, comprising: S1, flying shear triplet shearing shaping control: in the tail section of strip steel cutting stage, by the pre swing control of flying shear, shearing speed matching control and delay closing control, the cross section shape of strip steel tail section is actively shaped;S2, three-stage variable tension gradient coupling coiling control: in the preset length range before the tail section of strip steel enters coiler, establish segmented tension control model, constant tension, nonlinear slow descent tension and pulse disturbance tension are sequentially applied, and the tail section metal flow is intervened by coupling coiling drum speed control;S3, pinch roll three-dimensional synergic tail locking control: by the ovality control of pinch roll, negative speed difference control and cooling control, the multi-field coupling mechanism of geometry-speed-temperature is established, and the tail section of strip steel is locked.The application eliminates fish tail defect systematically from shearing, coiling, tail locking three links.

The application discloses a forming die for eliminating the ovality of a special-shaped ring piece, which is used for bulging and extruding forming of the special-shaped ring and comprises two symmetrically arranged bulging tools and a fastening tool. The two bulging tools are correspondingly spliced to form a die body, and the fastening tool is sleeved on the die body to fix the two bulging tools. The two bulging tools are spliced to form a special-shaped groove on the inner wall of the die body for bulging forming of the special-shaped ring and a mounting hole on the position of the central axis of the die body for fixing the die body on a bulging machine. Since the profile of the special-shaped groove is a design profile, the ring blank is locked by the forming die during bulging and extruding processing, the profile of the ring blank is guaranteed to be the profile of the special-shaped groove, and thus the ring blank is processed to have the design profile and size, so that the ovality of the part is eliminated, and the purpose of guaranteeing the dimensional stability of the special-shaped ring piece during the bulging and extruding process is achieved.

The application provides a progressive correction and reinforcement method and device for a submarine pipeline pipe, and the specific steps are as follows: determining the diameter reduction rate of the pipeline pipe to be corrected and the radius of the diameter reduction die; four diameter reduction dies compress the pipeline pipe to be corrected under the action of a universal press, the correction in the L' length range is completed, and the correction of the full length size of the pipeline pipe to be corrected is progressively completed; the straightness and the ovality of the pipeline pipe after correction are measured; the change of the residual stress is analyzed through a cutting experiment; and the change of the hoop compressive yield strength is analyzed through a compression experiment. The application corrects the straightness and the ovality of the pipeline pipe, improves the hoop compressive yield strength of the pipeline pipe, reduces the hoop residual stress, improves the pressure collapse resistance and the service depth, the pipeline pipe after correction is subjected to low-temperature heat treatment, the hoop compressive yield strength and the pressure collapse resistance are further improved without affecting the geometric shape, and the application is particularly suitable for the correction and pressure collapse resistance performance reinforcement of the oil and gas pipeline pipe in a deep sea environment.

The invention provides large-diameter steel pipe sizing equipment for inhibiting ovality, and relates to the technical field of metal pipe machining and forming. Comprising an adjusting mechanism, a sizing mechanism, a sensing module and a main control unit, according to the equipment, active centering of the machining spindle and the actual centroid of a pipe opening is achieved through the three-axis adjusting base; the main control unit is used for controlling a sizing roller extending into a pipe to perform reciprocating spinning rounding in a large sector avoiding a longitudinal weld joint based on contour and weld joint data acquired by the sensing module, and performing micro-differential variable-radian sweeping in a short-axis area through electro-hydraulic servo driving, so that a reverse ellipse for counteracting unloading springback is accurately pressed out; meanwhile, the external shock excitation mechanism and the internal sizing roller form a follow-up clamp, and ultrasonic waves are synchronously transmitted to excite the acoustic plastic effect; according to the method, polygon defects and weld joint damage are eliminated, deformation compensation and residual stress elimination are achieved, and the port stability of the large-diameter steel pipe is improved.

The present application belongs to the technical field of scanning measurement, and particularly relates to a cable outer diameter and ovality measurement method and system based on line laser profile scanning, to solve the technical problem of low measurement accuracy caused by sensitivity of existing algorithms to noise, light strip asymmetry and profile discrete points. The measurement method comprises the following steps: S1, performing anisotropic Gaussian filtering on pixels according to the local tangent direction of the preliminary center line; S2, calculating the second derivative value and the third derivative value of the sub-pixel center point in the normal direction; S3, using the corrected profile point set and the corresponding fitting weight, performing initial weighted least squares ellipse fitting to obtain the parameters of the initial ellipse; S4, based on the length of the major axis and the minor axis of the fitted ellipse, calculating the outer diameter and the ovality of the cable. The measurement method eliminates the interference of abnormal data points introduced by cable surface oil stains, scratches and local defects, and improves the accuracy and stability of the fitting result.

The invention relates to a high-precision cutting device for a large-diameter high-strength steel cylinder structure, and belongs to the field of numerical control profiling machining of large cylinder structures. The device comprises a driving unit, a tool bit, a measurement profiling unit and a numerical control unit, the driving unit is used for driving the tool bit to perform six-degree-of-freedom motion so as to cut a workpiece; the measurement profiling unit is used for measuring the surface of the workpiece to obtain the actual shape of the surface of the workpiece; the numerical control unit is used for generating a tool bit machining path according to the obtained actual morphology of the workpiece surface. According to the invention, six-degree-of-freedom multi-axis movement of the tool bit can be realized. The numerical control unit generates a self-adaptive machining path through a trajectory planning and compensation algorithm, dynamic trajectory correction is achieved through the multi-axis linkage control module, the method can adapt to the situation of workpiece field deformation, adjustment flexibility is good, field machining efficiency and adaptability are remarkably improved, and machining precision is improved. And meanwhile, the problem of insufficient cutting precision caused by ovality and local deformation of a large-diameter cylinder is solved.