24 results about "Roundness error" patented technology

The invention discloses a deterministic modification method and device for the inner wall of a cylindrical metal part. The method comprises the steps that a roundness instrument is used for measuring multi-section roundness error data of the inner wall of the cylindrical metal part, self-adaptive filtering processing is carried out, a polishing wheel for deterministic modification is selected, machining parameters are set, and a removal function is obtained. The removal function and the multi-section roundness error data obtained after self-adaptive filtering are used for simulation machining in process software, it is ensured that a polishing wheel and machining parameters meet the requirements, whether the dynamic performance of a machine tool meets the requirements or not is judged to obtain the optimal removal function, deterministic shape correction machining is conducted on the inner wall of the metal cylindrical part in combination with the optimal removal function, and the machining precision of the inner wall of the metal cylindrical part is improved. And if the roundness error data does not meet the requirement after the processing is finished, continuing iterative processing until the roundness error data meets the requirement. The method aims to overcome the limitation of the problem of error reflection, the machining efficiency of the inner wall of the metal cylindrical part is improved, and the machining precision of the inner wall of the metal cylindrical part is improved.

The invention belongs to the field of irregular profile measurement, and particularly relates to a holder roundness error detection device and a detection method. In order to conveniently measure the roundness error of a retainer of a wind power bearing, the invention provides a retainer roundness error detection device which comprises a measuring head and at least three positioning pieces arranged on the same circumference corresponding to the guide surface of the retainer at intervals, and the central angles corresponding to arcs corresponding to all the positioning pieces are greater than 180 degrees; each positioning piece is used for being in contact with and movably matched with the guide surface of the retainer, the measuring head is fixedly connected to one positioning piece, and the measuring head is used for being in contact with the guide surface of the retainer so as to be used for measuring the guide surface of the retainer. The invention further provides a holder roundness error detection method adopting the holder roundness error detection device. According to the invention, the holder does not need to be moved to a measuring platform, but the detection device is moved to the holder, so that the roundness error of the holder can be measured conveniently.

The present invention relates to the technical field of metal cutting, and particularly to a high-precision numerically controlled vertical grinding machine, which includes a column module, a bed module, and a grinding head module. The column module is connected to the bed module. A turntable is arranged on the bed, and a spindle box is slidably arranged on the column. A main shaft is arranged in the spindle box, and the main shaft is connected to the grinding head module. A topology repair module is also arranged in the spindle box; through the linkage design of the centering unit by the fixed seat, the centering plate, the pushing sub-unit, and the centering rod, it directly acts on the outer periphery of the main shaft to compensate the center deviation of the main shaft in real time; the pushing sub-unit is controlled by the control unit and can adjust the displacement of the centering plate according to the instruction output by the error repair model, so as to correct the radial offset of the main shaft caused by insufficient rigidity or assembly error; it solves the problems of large surface roughness and cumulative roundness error of the processed surface caused by vibration and center offset of the traditional grinding machine, and realizes high-precision deep hole processing.

The invention discloses a method for predicting the grinding roundness of a ball bearing outer ring groove. The method comprises the following steps: acquiring parameters of a machined bearing outer ring, grinding wheel parameters and grinding process parameters; the total rotation angle of the bearing outer ring and the angle step length of rotation of the outer ring are set; giving the parameters, and calculating the total positioning error of the jth grinding point of the outer ring channel according to the feeding direction of the grinding wheel and the geometrical relationship between the bearing outer ring and the front and rear supporting blocks; calculating the actual grinding wheel feed amount of the jth grinding point of the outer ring channel when the rotation error of the grinding wheel spindle is considered; calculating the radius value of the jth grinding point of the outer ring channel after grinding according to the steps S3 and S4; repeating the steps S3-S5 until the grinding is finished; and calculating the roundness value of the outer ring channel by using a least square method. According to the scheme, the bearing outer ring channel grinding rounding process and the roundness error when the bearing outer ring channel, the bearing outer ring surface roundness error and the grinding wheel spindle radial run-out value are known or given can be predicted, and a theoretical basis is provided for bearing outer ring channel grinding and precision regulation and control.

The invention relates to the technical field of turning, in particular to a floating clamp. Existing part blanks such as bearing rings are generally formed by forging on a forging bed after bar blanking, and the parts of the type have large outer circle roundness errors. In automatic equipment, the outer diameter needs to be roughly ground through a grinding machine, and cost is high. A main shaft is provided with a flange plate, backer seats and clamp seats are arranged on the inner side and the outer side of the flange plate, a pull rod is arranged in the main shaft, conical sleeves are arranged in the clamp seats, spring clamps are arranged in the conical sleeves, floating clamping blocks and the spring clamps are arranged in a free floating mode, and the floating amount is controlled by a control piece. A backer is arranged on the backer seat, and a workpiece abuts against the backer and is clamped and loosened by the floating clamping block; whether the position of the workpiece is correct or not is detected by the detection mechanism. According to the floating clamp, when the outer diameter roundness of a machined product is not round, the outer diameter can be clamped to machine the inner diameter. The blank is directly processed on equipment, so that the cost is reduced. Feeding can be achieved under the condition that a machine tool spindle rotates, and efficiency is improved.

The invention discloses an angular contact ball bearing rotation precision accurate prediction method, and belongs to the technical field of angular contact ball bearing rotation precision prediction methods, and the method comprises the steps: 1, analyzing error components and influence factors, i.e., a radial form and position error # imgabs0 # and an axial form and position error # imgabs1 # of an outer ring, and an axial form and position error # imgabs2 # and an axial form and position error # imgabs1 # of an outer ring; the radial form and position error # imgabs2 # and the axial form and position error # imgabs3 # of the inner ring, the roundness error # imgabs4 # of the outer ring and the roundness error # imgabs5 # of the inner ring, and the surface topography error # imgabs6 # of the ball; step 2, obtaining a radial clearance # imgabs7 # and an axial clearance # imgabs8 # according to the geometrical relationship of the bearing, and respectively calculating the influence coefficients of the channel roundness error on the axial run-out and the radial run-out; and 3, calculating the radial and axial rotation precision of the inner and outer rings of the bearing according to the roundness, the form and position error and the influence coefficient obtained in the step 2. On the basis of the error superposition principle, an angular contact ball bearing rotation precision error prediction and optimization model is established by considering the equipment machining capacity, and precise prediction and optimization control of the bearing rotation precision are carried out through the model.

An eddy current sensor detection error elimination method based on roundness compensation comprises the steps that firstly, in a mechanical shafting supporting state, an eddy current sensor of a magnetic suspension bearing is used for detecting morphology errors such as roundness errors of a stator shaft, and an error curve is established through phase alignment; and in a magnetic suspension shafting supporting state, phase compensation is carried out on detection data of the eddy current sensor by utilizing an error curve through an optimization method, so that morphology errors such as roundness of a stator shaft at a detection cross section are eliminated, and the relative pose detection precision of the stator and the rotor of the magnetic suspension rotary joint is improved. And reference is provided for control law design of subsequent satellite high-precision attitude control.

The invention relates to the technical field of high-end bearing manufacturing, in particular to an asymmetric roundness correction and residual stress homogenization method for a ferrule, which comprises the following steps of: performing morphology detection on the ferrule subjected to heat treatment, and constructing an asymmetric roundness error model; determining a correction point based on the asymmetric roundness error model; designing a detection point based on the correction point, performing residual stress detection on the detection point, and constructing a residual stress model; constructing a thermal-mechanical coupling correction path based on the asymmetric roundness error model and the residual stress model; on the basis of a heat-force coupling correction path, local heating is conducted on the correction points, asymmetric loads are applied under the temperature control condition, controllable plastic deformation is induced, and roundness error correction and residual stress redistribution are conducted; and low-temperature tempering and vibration aging treatment are sequentially carried out on the ferrule after roundness error correction, and the method has the advantage that the problems of asymmetric deformation and uneven stress generated after heat treatment of the tapered roller bearing ferrule are effectively solved.

This invention discloses a zero-error roundness centerless grinding device with online closed-loop dimensional measurement and control, belonging to the field of precision bearing grinding technology. Addressing the industry pain points of traditional grinding machines worldwide—namely, inherent roundness errors due to eccentricity and uneven loading, lack of end-to-end online precision control, and poor batch consistency—this invention employs a double-symmetrical rigid fulcrum to permanently lock the workpiece center. Combined with a power mechanism driving the workpiece to rotate concentrically, the grinding wheel performs symmetrical and balanced grinding around the circumference. Simultaneously, a high-precision dimensional measuring head collects workpiece parameters in real time and provides closed-loop dynamic compensation for grinding deviations. The device achieves alignment of the workpiece's rotation, geometry, grinding, and inspection centers, completely eliminating elliptical, angular, and radial runout errors at their structural root, achieving theoretically zero roundness and ultra-high precision machining. The equipment exhibits excellent rigidity, low operating vibration, and extremely high batch processing stability, filling the global gap in zero-error grinding technology for precision rotating parts under extreme working conditions.

In the field of testing and metering, a minimum region circle method is a method with the minimum roundness error value in four roundness error evaluation methods (a least square circle method, a minimum circumcircle method, a maximum incircle method and a minimum region circle method). The judgment condition of the minimum area circle is that two feature points on the outer circle and the inner circle of the two concentric circles are alternately distributed. Starting from the condition, the feature points on the outer circle and the inner circle of the minimum area circle serve as research objects, geometric conditions met by the feature points are provided, and the two feature points on the outer circle and the two feature points on the inner circle of the minimum area circle can be independently and accurately determined through the conditions.

The present invention discloses a method and system for compensating for spindle eccentricity error of a circular grating encoder. The method utilizes the principle of evenly arranging capacitive displacement sensors to obtain the instantaneous vector of the spindle axis displacement, establishes a three-point error separation model, separates the roundness error of a standard sphere from the radial rotation error of the spindle, and thereby obtains an accurate radial rotation error of the spindle. A high-precision autocollimator is used to calibrate the circular grating encoder, and the average of multiple measurements is used as the system error to perform angle compensation on the circular grating encoder. Through angle compensation, the circular grating encoder achieves an angular measurement accuracy of ±1.62″ after eliminating the system error, which is two arc seconds higher than the nominal accuracy of ±2.79″. The present invention can effectively eliminate the influence of spindle installation eccentricity on the angular measurement accuracy of the circular grating, and is of great significance for improving the angular measurement accuracy of the circular grating encoder.

A kind of roundness compensation-based eddy current sensor detection error elimination method, first in the state of mechanical shafting support, the roundness error and other topography errors of stator shaft are detected using the eddy current sensor provided with magnetic suspension bearing, and error curve is established by phase alignment;Then in the state of magnetic suspension shafting support, the detection data of eddy current sensor is compensated according to phase by using optimization method and error curve, so as to eliminate the roundness and other topography errors of stator shaft at the detection section, improve the relative pose detection accuracy of magnetic suspension rotary joint stator and rotor, and provide reference for the control law design of subsequent satellite high-precision attitude control.

The application provides a kind of roll grinding precision online compensation method, compensation system, grinding machine numerical control system and grinding machine, it is related to grinding machine control technical field.The method is carried out synchronously by grinding machine grinding and measurement, collects roll position, diameter data, and calculates roll shape error in combination with theoretical roll shape;Roundness error and high-frequency interference are filtered out by adaptive filtering, and the data is stored in a circular queue;According to the monotonicity of roll shape, the fitting interval is divided, the adaptive fitting and the smooth processing of connection are used to generate continuous grinding error curve;The compensation curve is generated by scaling the error curve, which can dynamically adjust the compensation strength and set the overload protection;The compensation curve and the roll shape curve are applied to grinding after parallel interpolation.This application solves the problem that existing grinding machines can only measure but cannot compensate, improves grinding precision and process stability, and adapts to various roll shapes and processing scenarios.

A method for predicting the grinding roundness of an outer ring channel of a ball bearing relates to the field of bearing processing, and comprises the following steps: uniformly dispersing a grinding wheel and an outer ring channel profile into n grinding points and m grinding points in the circumferential direction, and inputting grinding wheel parameters, outer ring parameters and grinding process parameters; determining channel center displacement and main shaft displacement according to grinding process parameters, and determining Newmak correction parameters and parameters; whether the theoretical instantaneous grinding amount of the # imgabs0 # time step is larger than zero or not is judged, the unbalanced force and the normal grinding force are substituted into a structural dynamic equation set of the grinding system, and the dynamic equation set is solved through a Newmark-beta method; the vibration displacement, speed and acceleration of the grinding wheel and the ferrule in the # imgabs 1 # time step are calculated; the instantaneous abrasion loss of the grinding wheel in the # imgabs2 # time step is calculated; calculating the actual grinding amount of the # imgabs3 # time step channel and the radius value after grinding; and finally, calculating the roundness error of the channel in the grinding process based on a least square method. According to the scheme, the dynamic change of the channel profile in the bearing outer ring channel grinding process and the roundness error of the channel after grinding is finished can be predicted.

The invention relates to the technical field of precision bearing manufacturing, and discloses a high-rigidity crossed roller bearing and a ferrule integrated grinding and detecting method thereof.The method comprises the steps that ferrule raceway roundness error data, end face flatness error data and perpendicularity error data are obtained; establishing a form and position error coupling relation equation set based on the clamping deformation influence coefficient matrix, and outputting a transfer function matrix; based on the transfer function matrix, the decoupling compensation amount of each machining surface is calculated; a comprehensive compensation instruction is generated, and coordinated compensation is executed through the multi-axis linkage control system. The problem that multiple form and position precision cannot be met at the same time due to independent error compensation in thin-wall ferrule grinding is solved.

The invention relates to an indexing method roundness error separation method, in particular to an indexing method roundness error separation method based on eccentric tilt error coupling. The objective of the invention is to solve the problem that the size of the indexing angle deviation and the indexing accuracy have great influence on the effect of an indexing method roundness error separation method. Aiming at the condition that the size of the indexing angle deviation and the indexing accuracy have great influence on the effect of the indexing method roundness error separation method, an indexing angle error transmission model of the indexing method roundness error separation method based on eccentric and inclined error coupling is provided, and the influence of the eccentric and inclined errors on the indexing angle error is analyzed; and correspondingly adjusting each offset range according to the analysis structure so as to reduce the transposition angle deviation and further reduce the influence of the transposition angle deviation on the error separation precision of the transposition method. The invention belongs to the technical field of ultra-precise geometric measurement.

The invention discloses a rolling bearing rotation precision uncertainty analysis method considering roundness errors of a raceway. The method comprises the following steps: firstly, providing a rotation precision calculation method with radial runout of a bearing outer ring as a representation; secondly, on the basis of roundness error test data of the raceway of the bearing outer ring, a Newton iteration method is adopted to correct roundness errors, and the errors can be controlled within 1% after correction; establishing a regression function of harmonic distribution parameters and radial run-out of the bearing outer ring raceway through a regression analysis method; and finally, based on the regression function, performing uncertainty analysis by adopting a multi-peak random uncertainty analysis method, and accurately obtaining a cumulative distribution function value and a probability density function value of the radial run-out of the outer ring. According to the high-efficiency ternary dimension reduction (ETDRM) method, high-dimensional integrals meeting conditions are disassembled to improve the calculation efficiency, compared with a Monte Carlo method, the simulation result greatly improves the calculation efficiency and precision, the accuracy and high efficiency of the ETDRM method are verified, and the result shows that the rotation precision of the rolling bearing can be effectively predicted.

The invention discloses a non-rigid casing and a constraint machining method thereof, belongs to the technical field of machining, and comprises technological processes and constraint conditions. The machining method is used for solving the problems that according to a machining method of a non-rigid case in the prior art, deformation is prone to being generated in the machining process, the coaxiality or position degree of parts is out of tolerance, the assembly precision is affected, and the assembly stress is increased. According to the method, the technical requirements of the constraint state and the free state are clearly distinguished, and the deformation control is enhanced. The flatness error of the reference surface in a free state is controlled to reduce the compression deformation of the casing; the roundness error of the reference circle in a free state is controlled to reduce the positioning deformation of the cartridge receiver; the technical requirement of controlling the free state is to strengthen the control of cutting parameters, namely cutting force; the shape error of the case in the machining state is limited by adopting reasonable constraint conditions, so that the machining state and the assembly state of the case are consistent, the assembly precision of the case on an engine is improved, and the assembly stress is reduced.

The application provides a multi-field coupling high-temperature alloy ring forging piece rolling forming process optimization method and system, and is applied to the ring forging piece manufacturing technical field. The method comprises the following steps: setting initial cross-section geometric parameters and an initial rolling process path in a first three-dimensional geometric model of an initial pre-rolled blank corresponding to a high-temperature alloy ring forging piece, obtaining a second three-dimensional geometric model, combining a flow field, a temperature field, a strain field and a microstructure evolution model to construct a finite element model, and then simulating and emulating the rolling forming process of the initial pre-rolled blank to obtain roundness error, end face flatness, strain distribution uniformity, ring forging piece cross-section dynamic recrystallization fraction and average grain size pass rate; when the comprehensive evaluation score determined according to the five data is greater than a preset score threshold, the finite element model is determined as a target finite element model, the initial cross-section geometric parameters are determined as target cross-section geometric parameters and the initial rolling process path is determined as a target rolling process path. The product qualification rate and performance consistency are significantly improved.

The present invention discloses a method for accurately predicting the rotational accuracy of angular contact ball bearings, belonging to the technical field of methods for predicting the rotational accuracy of angular contact ball bearings. The method is as follows: Step 1: Analyze the error components and influencing factors, which are respectively the geometric errors in the radial direction and axial direction of the outer ring, the geometric errors in the radial direction and axial direction of the inner ring, the roundness error of the outer ring and the roundness error of the inner ring, and the surface topography error of the balls; Step 2: Obtain the radial clearance and axial clearance according to the bearing geometric relationship, and calculate the influence coefficients of the groove roundness error on the axial runout and radial runout respectively; Step 3: Calculate the rotational accuracy of the inner and outer rings of the bearing in the radial and axial directions based on the roundness and geometric errors and the influence coefficients obtained in Step 2. The present invention is based on the error superposition principle, establishes an error prediction and optimization model for the rotational accuracy of angular contact ball bearings considering the equipment processing capacity, and accurately predicts and optimally controls the rotational accuracy of the bearings through this model.

The invention belongs to the technical field of image processing, and particularly relates to a machine vision-based die steel micropore processing roundness error on-line detection method, which comprises the following steps of: acquiring an original grayscale image of a micropore, and performing contrast-limited adaptive histogram equalization processing to obtain an enhanced grayscale image; establishing a polar coordinate system to obtain an original edge radius sequence, and determining an illumination gradient confidence weight according to the local average brightness and gradient magnitude of edge pixel points; performing weighted smooth correction and fast Fourier transform on the radius sequence by using the weight, and calculating a micropore flutter hazard index; and calculating a final quality score in combination with the image global credibility and the hazard index. Reflection false edge interference is effectively suppressed, high-frequency polygon flutter errors are highlighted to early warn cutter wear, and an engineering fault-tolerant mechanism and detection stability are improved.

The application discloses a certainty modification method and device for the inner wall of a metal cylindrical part, and the method comprises the following steps: measuring the multi-section roundness error data of the inner wall of the metal cylindrical part by using a roundness instrument, performing adaptive filtering processing, selecting a polishing wheel for certainty modification, setting processing parameters and obtaining a removal function; performing simulation processing in a process software by using the removal function and the multi-section roundness error data after adaptive filtering, ensuring that the polishing wheel and the processing parameters meet the requirements, whether the dynamic performance of a machine tool meets the requirements or not, so as to obtain an optimal removal function, combining the optimal removal function to perform certainty modification processing on the inner wall of the metal cylindrical part, and if the roundness error data does not meet the requirements after the processing is completed, iterative processing is continuously performed until the roundness error data meets the requirements. The application aims to overcome the limitation of the "error reflection" problem, improve the processing efficiency of the inner wall of the metal cylindrical part and improve the processing precision of the inner wall of the metal cylindrical part.

This invention relates to a dynamic detection method for the roundness fluctuation of the inner ring of a bearing in the field of bearing testing technology, comprising the following steps: S1, supporting the outer ring of the bearing with non-contact magnetic force and actively stabilizing the outer ring in a preset spatial posture; S2, applying a preset multi-dimensional dynamic excitation force to the outer ring of the bearing; S3, driving the inner ring of the bearing to rotate around its axis. This invention combines non-contact magnetic support and stabilization of the outer ring with independent driving of the inner ring rotation, so that the bearing under test is in a dynamic condition that is closer to the actual complex support state, thereby stimulating a more realistic and richer dynamic fluctuation signal. Based on the dynamic response signal, the dynamic roundness fluctuation component caused by the roundness error of the inner ring raceway is separated and quantified by a coupling and decoupling algorithm.

The application belongs to the technical field of size detection, and discloses a shaft roundness error detection system and method, which comprises: an air floating support seat for supporting the lower end surface of a shaft to be detected; a rotating driving mechanism for driving the shaft to be detected to rotate around its own axis; a positioning mechanism for transversely positioning the shaft to be detected; a measuring system comprising a plurality of measuring units arranged at intervals in the up-down direction, wherein each measuring unit comprises an interferometer and a measuring head; the measuring head is used for contacting the circumferential surface of the shaft to be detected, so as to produce displacement with the profile change of the shaft to be detected; the interferometer is used for converting the displacement of the measuring head into an interference fringe image and outputting; and a host computer is used for calculating the roundness error of the shaft to be detected at a plurality of different cross sections according to the interference fringe image, so as to calculate the overall roundness error of the shaft to be detected; thus, a feasible technical scheme is provided for accurate and efficient detection of large shafts.