48 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 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.

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 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.

The present invention provides a method and device for measuring the ovality of a water conveyance pipeline, belonging to the technical field of ovality measurement. It is relatively simple and has high measurement accuracy, and can better reflect the bending degree of the water conveyance pipeline, thereby better realizing the measurement of the performance of the water conveyance pipeline. This method determines at least three intersection points of the rays and the inner wall of the water conveyance pipeline through the ray lengths and vertical angles of at least three emitted rays, and then determines the major axis and minor axis of the cross-section of the water conveyance pipeline by using the above intersection points, and calculates the ovality of the water conveyance pipeline according to the major axis and minor axis.

The invention relates to an elliptical side wall pass design method for controlling the ovality of a pipe based on stress-strain, which comprises the following steps of: inputting the outer diameter Dk and the wall thickness Sk of a pipe blank, the outer diameter Dj and the wall thickness Sj of a finished pipe, a roll gap SP, the length L of a deformation area, a pass opening angle alpha and an initial feeding amount t, and calculating a single-side initial opening value FCx of a pass side wall; a cyclic compression experiment is conducted on the pipe material, the initial opening value FCx is corrected according to stress-strain data of the pipe material, and the opening value Fx of the side wall of the hole pattern is calculated; meanwhile, necessary parameters of an oval side wall hole type opening are calculated; and finally, the maximum pipe feeding amount tmax is determined according to the critical point O of the elliptic curve. According to the stress-strain parameter characteristics of metal deformation, the pass opening is designed, stable rolling of the pipe is achieved, meanwhile, the ovality of the cold-rolled pipe in the rolling process can be controlled through uniform deformation of metal, the yield of the pipe is increased, and the production cost is reduced.

The application relates to the field of perpendicularity detection devices, in particular to a construction hole perpendicularity detection method and a construction hole perpendicularity detection device. The construction hole perpendicularity detection method is characterized in that a periodic length change is applied to a plumb line, a suspended spherical hammer body generates a limited displacement response in the hole, and the deflection direction and the inclination angle of the shaft are calculated by using a coordinate sequence and a reference signal. The method can still obtain effective data with high signal-to-noise ratio under the condition of a small annular gap, accurately detects the deflection direction and the inclination angle of the shaft line of the construction hole, simplifies the detection process, improves the detection efficiency and reliability, and solves the problem that the detection result is unstable and inaccurate due to the influence of the hole wall ovality, water flow disturbance, wire friction and environmental noise in the prior art which depends on a single static plumb line reading.

The application discloses a four-roll centering roller-based opening degree adjusting method, solves the problems that the rolled steel pipe is easy to fall along the vertical direction and the wall thickness and the ovality of the rolled steel pipe are out of tolerance, arranges one centering roller above, below, left and right of the rolling center line to form a four-roll centering arrangement mode, sets four centering pins on the frame around the rolling center, hingedly connects one special-shaped swing arm on each centering pin, connects the four special-shaped swing arms together through connecting rods to form three parallelogram four-link mechanisms which can be connected simultaneously, and makes the four centering rollers always arranged on a circle through the three parallelogram four-link mechanisms which can swing simultaneously, so that the synchronous adjustment of the opening degree is realized, and the four centering rollers are always arranged on the same circle.

The invention relates to a linear side wall pass opening design method for controlling the ovality of a cold-rolled pipe. The method comprises the steps that the outer diameter and the wall thickness of a pipe blank, the outer diameter and the wall thickness of a finished pipe, a roller gap and a rolling rotation angle gamma are input; the opening angle of the linear side wall hole pattern and the feeding amount in the pipe rolling process can be mutually determined; determining a rolling separation point O of the initial section of the pipe on the hole-shaped section, namely calculating an included angle between an O1O connecting line and an opening angle arc side line; calculating the specific gravity value of the depressed area, and determining the feeding amount and the opening angle when the specific gravity value is smaller than or equal to a threshold value; when the specific gravity value is larger than the threshold value, the feeding amount or the opening angle of the linear side wall hole pattern is adjusted again till the specific gravity value of the screw-down area is smaller than or equal to the threshold value; and finally, calculating to obtain the hole pattern opening width Bx. According to the method, the relation among the feeding amount, the initial pipe specification and the hole pattern opening is obtained through calculation, the ovality of the cold-rolled pipe in the rolling process can be accurately controlled, and the rolling efficiency and the product size precision are improved.

A method for determining rock mechanical properties is disclosed. The method includes obtaining, at a selected depth location of a borehole, initial radial geometry measurements of the borehole and initial borehole fluid pressure measurements of a borehole fluid, perturbing a pressure of the borehole fluid, obtaining, in response to perturbing the pressure of the borehole fluid and at the selected depth location, dynamic radial geometry measurements of the borehole, analyzing a difference of the initial radial geometry measurements and the dynamic radial geometry measurements to determine differences in radial and axial components of strain tensor at a surface of the borehole at the selected depth location, determining the rock mechanical properties at the selected depth location by analyzing the differences in the radial and axial components of the strain tensor, and facilitating, based at least on the determined rock mechanical properties, a drilling operation of the subterranean formation.

The utility model relates to the technical field of machine tool accessories, in particular to an inner diameter size and roundness detection machine. In the production of bearing rings, especially inner rings, the problems of product deformation and end face bumping easily caused by the detection of the inner diameter size and ovality of a product of which the height is less than 8mm and the single-face wall thickness is less than 1mm are solved. An inner diameter size and roundness detection machine comprises a workpiece and a rack, and the rack is provided with a measuring mechanism and a feeding mechanism. The measuring mechanism comprises a base, a measuring frame bottom plate, a left measuring head and a right measuring head, and the left measuring head and the right measuring head are used for measuring the inner diameter or the roundness; the left measuring head and the right measuring head are in sliding connection with the measuring claw folding and unfolding guide plate, and the measuring claw folding and unfolding guide plate drives the left measuring head and the right measuring head to be unfolded for detection. The device is simple to operate and debug, reliable in action and high in response speed.