201 results about "Single tooth" patented technology

The present invention relates to the technical field of dental medical treatment, and specifically discloses a method for using a CBCT (Cone Beam Computer Tomography) for automatically positioning a tooth, which comprises the following steps: S01, archiving CT data; S02, calculating AI and generating AI results; S03, entering CT reading by a client; S04, downloading and loading the CT data; S05, opening a function of a tooth lens; S06, selecting a corresponding tooth position in a tooth position list; and S07, selecting a 3D tooth rendering mode. The function of the ‘tooth lens’ is added into traditional CT reading, which is suitable for clinical disease diagnoses such as ‘tooth extraction, root canal therapy, tooth repair’ and the like in oral treatment, and doctors can precisely and quickly position the single tooth through selection for the tooth position, which facilitates more comprehensive analysis.

The invention relates to an image processing method which comprises the following steps: acquiring a visible light image, a near-infrared image and a fluorescence image of the same tooth area to obtain a multi-modal image; inputting the multi-modal image into a segmentation network, embedding a space attention module into a jump connection between an encoder and a decoder of the segmentation network, and outputting a binary mask of a tooth area by the segmentation network; extracting contours of a single tooth from the binary mask, and determining a minimum enclosing rectangle and a geometric center of gravity of each contour; distributing FDI tooth position codes for each contour according to the horizontal coordinates of the geometric center of gravity; according to the minimum enclosing rectangle, cutting out a corresponding single tooth image block from the multi-modal image; inputting the single tooth image block into a multi-branch convolutional neural network to obtain a unified feature vector; and inputting the unified feature vector into a full-connection classification network, and outputting probability values corresponding to different categories by the full-connection classification network. The invention also relates to an image processing device, a medium and a computer program product, and a tooth recognition system.

The present invention relates to a helical gear detection method and gear detection system based on waviness information. The helical gear detection method based on waviness information comprises the following steps: extracting the full tooth waviness information of the helical gear; processing the full tooth waviness information to obtain a frequency spectrum; calculating the angle α of the waviness on any single tooth of the helical gear; judging whether the gear meets the noise requirement based on the angle α of the waviness on the single tooth and the frequency spectrum. The present invention calculates and extracts the important factors affecting the gear meshing noise by analyzing the full tooth order of the involute helical gear and the three-dimensional angle of the single tooth topology. It can effectively detect the tooth surface waviness information, identify and discover ghost frequencies, and analyze the angle of the corrugation line. Compared with the existing detection method, it greatly improves the fitting quality of the data, thereby improving the detection accuracy of the gear, so that it meets the noise detection requirements, and provides a new detection method for the production of high-speed and low-noise gears.

The invention discloses a tooth instance segmentation method and device based on anatomic form priori, and belongs to the field of computer vision and artificial intelligence. According to the method, model training is carried out on a CBCT image, a real segmentation mask is processed into a three-classification segmentation mask with enamel as a boundary, the three-classification segmentation mask serves as a supervision signal, a network can directly output a prediction segmentation mask containing tooth boundary information in a reasoning stage, and a detection frame is generated accordingly. And after the detection frame is scaled according to the same proportionality coefficient and projected back to the original image, cutting each tooth to obtain a CBCT image of the single tooth. A loss function based on anatomical morphological prior is introduced into segmentation training of a single tooth CBCT image, and a network is constrained through a self-adaptively extracted morphological skeleton, so that a prediction segmentation mask is kept continuous at a root tip part, and the problem of tooth root segmentation fracture is effectively relieved. According to the method, accurate positioning and high-quality segmentation of the tooth instances are realized, so that the segmentation of the tooth instances in the full-mouth CBCT image is quicker and more accurate.

The invention relates to a mechanical evaluation system based on rotation and inclination of a bracket-free appliance, and belongs to the technical field of orthodontic equipment. The system comprises four core units: an integral dental arch constraint unit simulates oral temperature through a constant-temperature water bath assembly, adjusts model postures through a camera holder type adjustable dental arch base, and constructs a precise constraint environment; the clinical displacement driving unit is based on an anchorage center bearing lever structure, and positioning-driving-data synchronization is achieved through adjustable anchorage positioning, multi-direction servo driving and displacement closed-loop calibration. The single-tooth mechanical sensing unit collects dynamic mechanical data, and interference is removed through Kalman filtering; and the data processing unit corrects attenuation deviation by using multiple linear regression in combination with environmental parameters, generates a mechanical attenuation curve, calculates a time attenuation percentage, and outputs a mechanical evaluation report by comparing with a clinical suitable force application interval. The evaluation accuracy and clinical suitability of the method provide a scientific basis for the optimization of an orthodontic scheme.

The utility model relates to the technical field of daily hardware fittings, in particular to a single-tooth hinge. The single-tooth hinge comprises a first auxiliary rod, a second auxiliary rod, a supporting rod and a base. The supporting rod is rotationally connected with the first auxiliary rod and the second auxiliary rod. The second auxiliary rod is provided with a second rotating shaft, and the first auxiliary rod is provided with a first rotating shaft; a single-tooth structure is further arranged between the end of the first auxiliary rod and the base and comprises a single-tooth part arranged on the first auxiliary rod and a protruding part arranged on the base and clamped into the single-tooth part. Due to the fact that only one single-tooth part and one protruding part are arranged, compared with a structure with multiple tooth parts, the damage probability is greatly reduced, the use frequency is improved, long-term stable push-pull operation is ensured, and due to the fact that the single-tooth structure is relatively simple, maintenance and repair are relatively easy.

The utility model discloses an assembling and welding mechanism for a concentrated winding iron core. The device comprises a base, a hollow rotating platform, a first base table and a second base table, the hollow rotating platform is fixed to the base, the first base table and the second base table are fixed to the hollow rotating platform, and the hollow rotating platform rotates by 180 degrees to drive the first base table and the second base table to be interchanged in position. The first base station and the second base station are each provided with a positioning rotating tool, a pneumatic clamping jaw disc and a jacking mechanism in a rotating mode, the positioning rotating tools are used for assembling the single-tooth iron core into the stator, the pneumatic clamping jaw discs are arranged in the positioning rotating tools, the pneumatic clamping jaw discs are used for internally supporting the positioning rotating tools, and the jacking mechanisms are used for jacking the stator out of the positioning rotating tools. According to the utility model, the first base station and the second base station realize stator assembling and welding double stations, the first base station and the second base station rotate to exchange positions, the requirements of avoiding a framework and a coil are met, the welding operation and the assembling operation are continuously circulated, and the production efficiency is improved.

The utility model relates to an elbow cable tie which comprises a locking head, a bending part and a tie body which are connected in sequence, an extending-in opening and a pulling-out opening are formed in the two ends of an inner cavity of the locking head respectively, tie teeth are arranged on the two opposite sides of the tie body, and locking teeth matched with the tie teeth are arranged in the inner cavity of the locking head. And the extending direction of the bent part is inclined to the extending direction of the belt body. When the elbow binding belt is used for binding articles, the belt teeth on the two sides of the belt body are meshed with the locking teeth, the purpose of retaining the belt body is achieved, stress on the two sides reduces stress on a single tooth, tooth breakage is avoided, tooth loosening caused by pulling of the belt body is avoided through meshing of the two sides, and binding is more stable. Besides, the bending part is arranged between the locking head and the band body, and the extending direction of the bending part is inclined to the extending direction of the band body, so that the bending part can be close to the outer surface of an object to reduce a gap between the elbow binding band and the object during binding, the object can be prevented from sliding from the fixing cavity to be separated, and binding is more stable.

Embodiments of the present invention provide a method, system, devices and software which provide customized, clinically relevant designs, e.g. treatment plans / solutions for at least single tooth replacement therapy in real-time as needed to enable immediate confirmation of the validity and execution of patient-specific treatment solutions.A Machine Learning algorithm is used in a method or system for computer implementation of automatic restoration design. The restoration design includes the design of restorative elements such as crowns and abutments. Software is provided for carrying out the methods when executed on a digital processor. Manufacturing of the restorative elements is also included.

The invention discloses an IOS image and CBCT image registration method based on particle swarm and single-tooth optimization, and belongs to the field of image data processing, and the method comprises the following steps: respectively obtaining tooth semantic segmentation results and point cloud data of an IOS image and a CBCT image through preprocessing and segmentation steps; introducing a particle swarm optimization algorithm, and performing iterative search and optimization on six-degree-of-freedom rigid transformation parameters between the IOS image data and the CBCT image data so as to complete global initial registration of the dental arch scale; and on the basis of a result after global registration, a registration object is divided into a plurality of local units based on a single tooth, and local iteration alignment is performed on each unit, so that tiny dislocation on the single tooth is eliminated, and the overall registration effect is optimized. According to the method, on the basis of processing cross-modal difference and realizing global registration, the registration precision of a single tooth level is further ensured through a local optimization mechanism, and reliable automatic registration support is provided for clinical scenes such as orthodontics and implantation.

The invention discloses a rotary speed reducer gear tooth root strength test device which comprises a test bed, a mounting mechanism, a rotating mechanism, a limiting mechanism, a strength test mechanism and an observation mechanism. A mounting mechanism is arranged in the center of the test bench to fix a to-be-tested gear and can adapt to replacement of gears of different specifications; the mounting mechanism is connected with a rotating mechanism under the test bench, and a rotating motor is provided with an encoder to realize accurate rotation angle switching of a gear; limiting mechanisms are arranged on the left and right sides of the mounting mechanism and can move in the radial direction to be engaged with the gears for limiting or separated for avoiding. Strength test mechanisms are arranged in front and back, can be adjusted in the radial direction, can be meshed with a single tooth to apply force, and can be fed back by a force sensor to switch postures by rotating an oil cylinder and an air cylinder; an observation mechanism on the strength test mechanism is used for detecting tooth root cracks by using an endoscope and marking the tooth root cracks through a spray head. The device does not need repeated positioning, can continuously detect each tooth root, improves the efficiency and precision, is adaptive to gears of various specifications, and meets the industrial detection requirements.

The invention provides a PTv3-based intelligent automatic tooth arrangement method and device, and the method comprises the steps: collecting three-dimensional tooth point cloud data after orthodontic treatment, carrying out the noise filtering, outlier removal and triangular meshing processing of the point cloud data, and separating a single tooth model through a deep learning segmentation network; carrying out principal component analysis and principal axis alignment on the segmented tooth model, calculating curvature characteristics in combination with normal covariance, and dynamically allocating voxel retention density by adopting a curvature-driven gradient voxel downsampling strategy; generating data pairs before and after simulation orthodontics, and constructing an orthodontics database in combination with displacement direction probability constraint and an adjacent tooth collision punishment mechanism; a PTv3-based double-branch network architecture is constructed as an intelligent automatic tooth arrangement network model, a multi-objective loss function fusing geometric errors, collision constraints and clinical prior is set, and the model is trained through weighted optimization; and inputting the preprocessed tooth point cloud into the trained model, outputting spatial transformation parameters and generating a final arrangement result.

The invention discloses a spline meshing characteristic calculation method based on a time-varying meshing position. The spline meshing characteristic calculation method comprises the following steps: establishing a spline meshing state characterization model of a spline; the spline tooth backlash and the pressure angle containing parallel misalignment of the spline are obtained through the spline meshing state characterization model; establishing a spline single-tooth meshing stiffness calculation model through a potential energy method, the spline tooth backlash and the pressure angle; spline tooth meshing deformation coordination conditions are obtained according to the spline single-tooth meshing rigidity calculation model; a spline meshing deformation calculation method of the spline is obtained according to the spline tooth meshing deformation coordination condition; establishing a spline meshing force model containing parallel misalignment according to a spline meshing deformation calculation method; and acquiring spline meshing characteristics of the spline according to the spline meshing force model. According to the method, a spline meshing force model containing parallel misalignment is established; the spline meshing characteristics can be described more accurately, and the design of a high-speed, high-reliability and low-vibration mechanical transmission system is facilitated.

The utility model relates to an axial magnetic flux motor. The axial magnetic flux motor comprises a stator, the stator comprises a plurality of single-tooth units distributed around a central axis in the circumferential direction, each single-tooth unit comprises a single tooth and a coil, and the single tooth of each single-tooth unit has a longitudinal axis parallel to the central axis. The coil of each single-tooth unit is formed by a flat wire wound on the corresponding single tooth around the corresponding longitudinal axis, the size of the coil of each single-tooth unit in the width direction is larger than the size of the coil in the thickness direction, and the coil of each single-tooth unit is wound on the corresponding single tooth in an inclined mode. The respective coil has an inclination angle with respect to the respective longitudinal axis in the width direction that is greater than 0 degree and less than 90 degrees. The axial magnetic flux motor provided by the utility model has an improved winding mode.

The present application relates to a kind of based on bracketless appliance rotation and oblique mechanical evaluation system, belong to oral orthodontic equipment technical field.The system includes four big core units: whole dental arch constraint unit simulates oral temperature by constant temperature water bath component, camera holder type adjustable dental arch base adjusts model posture, constructs accurate constraint environment;Clinical displacement driving unit is based on anchorage center bearing lever structure, through adjustable anchorage positioning, multidirectional servo driving and displacement closed-loop calibration, realize positioning-driving-data synchronization;Single tooth mechanical sensing unit collects dynamic mechanical data, and interference is removed by Kalman filtering;Data processing unit combines environmental parameters, and uses multiple linear regression to correct attenuation bias, generates mechanical attenuation curve and calculates time attenuation percentage, compares clinical suitable force interval and outputs mechanical evaluation report.The evaluation accuracy and clinical adaptability of the present application provide scientific basis for oral orthodontic scheme optimization.

This utility model discloses a heavy-duty gear, specifically relating to the field of heavy-duty gear technology. It includes a gear disk with a plurality of tooth blocks arranged in a ring on its outer wall. A connecting structure is provided at the connection between the tooth blocks and the gear disk. The connecting structure includes a mating plate, which is fixedly installed on the bottom of the tooth blocks. A mating groove is formed on the surface of the gear disk, and a positioning groove is formed at the bottom of the inner cavity of the mating groove. A positioning block is fixedly installed at the bottom of the mating plate. Mounting grooves communicating with the mating grooves are formed on both sides of the outer wall of the gear disk. Mounting plates are fixedly installed at both ends of the mating plate. Fastening bolts are provided at the connection between the mounting plates and the gear disk. This utility model facilitates the installation of shafts and gear disks. Furthermore, once a single tooth block on the gear is worn or damaged, it allows operators to easily disassemble and replace the damaged tooth block, reducing gear maintenance costs and improving service life and performance.

This invention relates to the interdisciplinary field of medical image analysis and artificial intelligence, and particularly to a method, device, and medium for detecting non-occlusal abnormalities based on oral images. The method first acquires oral images and determines their abnormality category: a first abnormality (dependent on the characteristics of a single tooth) or a second abnormality (dependent on the spatial relationships between multiple teeth). Based on the category determination, an adaptive differential detection process is executed: if it is a first abnormality, a two-stage process of tooth position detection and single-tooth recognition is used to output a detection result associated with a precise FDI number; if it is a second abnormality, an end-to-end target detection model directly outputs the abnormality type and location region; if it is a mixed category, the two processes are executed in parallel and the results are intelligently integrated. This invention achieves automated, precise, and structured detection of non-occlusal diseases.

The invention relates to a manufacturing method of a stator of a motor, the stator and the motor, the stator is provided with an annular stator base body, the stator base body is formed by combining single T-shaped stator sections, and at least one insulating cover is sleeved on each stator section, and the manufacturing method is characterized by comprising the following steps of: winding a first single-tooth coil on the insulating cover of the first stator section; guiding a continuous connecting wire to the second stator segment, wherein the connecting wire extends from the first axial end face of the first stator segment to a second axial end face, axially opposite to the first axial end face, of the second stator segment; placing a connecting wire in an intermediate position on a second axial end face of the second stator segment radially outside a radial winding space of the second single-tooth coil prior to starting to wind the second stator segment; then a second single-tooth coil is wound on an insulating cover of a second stator section, a first winding layer of the second single-tooth coil is wound in a positive circulation mode, and all turns of the first winding layer extend parallel to the radial inner wall of the insulating cover in the axial direction; the wound first and second stator segments are combined into a stator ring.

This utility model relates to the field of gear hole machining technology, specifically to a device for machining balance shaft gear holes. It includes a connecting plate with several limiting grooves on one side. A gripper slides within these grooves. A worm gear ring rotates inside the connecting plate, with spiral teeth fixed to one side. Several arc-shaped tooth grooves meshing with the spiral teeth are formed on one side of the gripper. A worm rotates inside the connecting plate, meshing with the worm gear ring. A slot is formed at one end of the gripper, with a pair of positioning blocks rotating within it. A gear body is clamped between the grippers. This utility model solves the problem that in existing gear machining, machine tool clamps often grip only the outer edge of the gear, making single-tooth clamping prone to displacement. Furthermore, the self-locking mechanism between the grippers and the spiral teeth inevitably leads to loosening over time.

This invention provides a PDC single-tooth rock-breaking experimental device and a method for analyzing the rock-breaking mechanism. The experimental device includes a rock-breaking device body, a PDC tooth cutting depth adjustment mechanism, a cutting speed adjustment mechanism, and a cutting force measurement mechanism. The cutting speed adjustment mechanism can adjust the cutting speed of the rock sample; the rock-breaking device body is used to fix and install the cutting depth adjustment mechanism; the cutting depth adjustment mechanism can clamp the PDC tooth and precisely control its inclination angle and cutting depth; the cutting force measurement mechanism can monitor the cutting force on the rock sample. The method includes the following steps: setting parameters such as cutting depth, cutting speed, and inclination angle; monitoring the cutting force and recording the dynamic rock crushing process; sieving and collecting rock fragments, determining the mass fraction of different groups of rock fragments, and preliminarily determining the ductile-brittle crushing mode of the rock based on the distribution pattern of the rock fragments. This invention has the advantages of precisely controlling the cutting depth, PDC tooth inclination angle, and cutting speed.

The set of inventions relates to medical devices, in particular to surgical retractors and wound retractors for displacing and securing anatomy of a surgical incision in a given position during surgery to provide access to a surgical region of a patient's body. A removable clip for a surgical retractor, made as an L-shaped curved member, includes a base provided with a device for fixation in a surgical retractor and a microsurgical instrument recess, and a pair of teeth for holding an anatomical structure. The toothing is configured as a profiled plate with a working area widening to ensure contact with the anatomical structure, the widening being formed by a raised pad located at least on the inner and / or outer end edge side of the lower end of the plane of the toothing plate. The included angle between each tooth part and the plane of the base is smaller than 90 degrees, and therefore gaps used for passing of microsurgical instruments are formed between the tooth parts. The surgical retractor comprises a frame with a rack carrying a fixed arm and a movable arm, the fixed arm and the movable arm being hingedly connected to a retainer for the detachable clip, where the retainer is configured to receive at least one of the aforementioned detachable clips. A removable clip assembly for a surgical retractor includes at least one central dual tooth removable clip; the at least one peripheral double-tooth detachable clamp is constructed to be capable of accommodating the central double-tooth clamp between the tooth parts of the central double-tooth clamp; and at least one central single-tooth detachable clamp. The use of the invention provides an increased working space and a higher degree of freedom of surgical instrument operation, enabling access to the lateral region of the operated structure during surgery without extending the skin incision.

The invention relates to the technical field of ceramic cutting, and discloses a cutting device for ceramic machining, which comprises a machining table and a ceramic chip, the ceramic chip is arranged in the machining table, a cutting mechanism is arranged at the top of the inner side of the machining table, a driving mechanism is arranged at the bottom of the inner side of the machining table, and a limiting mechanism is arranged at the top of the driving mechanism. A damping mechanism is arranged at the bottom of the driving mechanism, the cutting mechanism comprises a dust collecting box fixedly connected to the upper surface of an inner cavity of the machining table, and mounting rods are symmetrically and fixedly connected to the outer wall of the dust collecting box; vibration generated in the ceramic chip is counteracted through friction force generated by mutual movement of the double-toothed plate and the single-toothed plate and the elastic abutting effect of the second spring, then the vibration amplitude of the ceramic chip is reduced, frequent collision between the ceramic chip and the cutting head is avoided, the abrasion rate of the cutting head is reduced, and the service life of the cutting head is prolonged. And meanwhile, the machining quality of the cutting opening of the ceramic chip is guaranteed.

The application discloses a single-tooth spliced outer rotor motor cooling device, which comprises a casing assembly, a stator assembly and a water cooling flow channel. The stator core of the stator assembly comprises a stator yoke arranged in a positioning groove and a plurality of stator teeth respectively detachably connected to the outer circumferential side of the stator yoke. The stator teeth are positioned and connected with the front limiting table and the rear limiting table through positioning shafts. The middle flow channel of the water cooling flow channel comprises a plurality of connecting flow channels which are respectively connected with a front backflow channel and a rear backflow channel. The positioning shafts are hollow structures to form part of the connecting flow channels. The outer circumferential side of the front end of the positioning shaft is sealingly connected with the front limiting table, and the outer circumferential side of the rear end is sealingly connected with the rear limiting table. The single-tooth spliced outer rotor motor cooling device not only facilitates the replacement of the stator teeth individually, reduces the maintenance cost, but also avoids the risk of contact between the cooling liquid and the stator core or the motor winding, prolongs the service life of the motor.

This invention belongs to the field of medical image processing technology and proposes a method for 3D tooth point cloud segmentation and tooth type recognition based on deep learning. The main scheme is as follows: acquire 3D tooth point cloud data, construct a 3D tooth point cloud dataset and perform data preprocessing; construct a 3D tooth point cloud semantic segmentation network and determine the loss function, and train the 3D tooth point cloud semantic segmentation network based on the loss function; use the trained 3D tooth point cloud semantic segmentation network to perform point-by-point semantic prediction on the point cloud of the tooth row to be tested, and obtain the point-level category probability distribution; perform multi-level probability smoothing and interpolation recovery on the point-level category probability distribution to improve the spatial continuity of the prediction results and restore the original point cloud resolution; perform density-adaptive connectivity analysis and denoising processing on the restored point cloud segmentation results to extract single tooth instances; and use instance-level category statistics for each single tooth instance to determine the final semantic category, thereby realizing tooth type recognition.

An automated method for aligning a 3D single tooth model to 3D oral scan data includes determining an oral scan landmark and a teeth curve formed by teeth in the 3D oral scan data, determining a margin line of a target tooth in the 3D oral scan data and a region of interest in the 3D oral scan data, determining first to third axes of the 3D oral scan data in the region of interest based on the oral scan landmark, determining a single tooth landmark of the 3D single tooth model, determining fourth to sixth axes of the 3D single tooth model based on the single tooth landmark and aligning the 3D single tooth model to the 3D oral scan data such that the fourth to sixth axes of the 3D single tooth model respectively overlap the first to third axes of the 3D oral scan data.

The invention relates to a single-thread tray, a mold taking method and device based on the single-thread tray, computer equipment, a storage medium and a computer program product. The single-tooth tray comprises a bottom wall and two side walls, the bottom wall is in a square shape with round and blunt corners, and at least one overflow hole is formed in the bottom wall; the side walls are of a symmetrical structure, the side walls are isosceles trapezoids or squares with blunt corners, and at least one overflow hole is formed in each side wall; the connecting angles between the side walls and the bottom wall are all obtuse angles. By adopting the single-tooth tray, the accuracy of mold taking can be improved.

The application relates to the technical field of laser processing, in particular to a mechanical part processing laser cutting equipment which comprises a base, a processing part, a workbench, a single-tooth plug-in part, a cleaning module, a control box one, a material receiving part, a spare part module and a control box two, the upper side of the base is provided with the processing part, the upper side of the base is provided with the workbench, the workbench comprises a pedestal fixed to the upper side of the base, a plurality of assembly grooves are arranged at equal intervals on the upper part of the front and back sides of the pedestal, support beams are fixedly connected to the inner sides of the assembly grooves, and positioning air channels are arranged on the inner sides of the support beams and penetrate through the front and back sides. In the application, the cleaning module, the workbench, the single-tooth plug-in part and the spare part module are arranged, so that when the support structure of the laser cutting equipment needs to be cleaned, the new support structure can be automatically replaced, and the old support structure to be cleaned can be automatically cleaned, thereby reducing the influence of the support cleaning operation on the laser processing efficiency.

The device comprises a container (1), a shell body (2) including an upper shell portion (21) rotatable relative to an inner shell portion (22), an indicator (3) including a threaded rod (31) rotatable on the inner shell portion, and an indicator element (32) that indicates a number of atomizations by its position on the threaded rod. The threaded rod includes a transmission gear, and the upper shell portion has a drive portion for the threaded rod. The transmission gear includes P teeth, and the drive portion has at most two single-tooth elements, such that P or 2P rotational movements displace the indicator element (32) one stroke along the threaded rod to allow a number of atomizations of the device P or 2P times a total stroke provided by the threaded rod in the axial direction. Figure 1

The machining method comprises the steps that firstly, a to-be-machined chain wheel workpiece is installed on a four-axis numerical control machine tool, and a chain wheel rotates around a rotating shaft A; secondly, the machining zero point of a single tooth profile of the chain wheel workpiece to be machined is determined; thirdly, a numerical control machining program of the single tooth profile track of the chain wheel workpiece to be machined is compiled in a fitting mode; fourthly, a single sprocket tooth form is machined through profiling milling according to the numerical control machining program of the single tooth form track; fifthly, the chain wheel workpiece to be machined rotates on the YZ plane, the next tooth profile machining zero point is determined, the corresponding tooth profile is machined again, and machining of all chain wheel tooth profiles on the single-row circumference is completed; and sixthly, moving in the X-axis direction, and repeating the steps to complete machining of all tooth profiles of the multiple rows of chain wheels. Machining of the tooth shape of the chain wheel is completed through milling, the requirement for the tooth surface coincidence degree between multiple rows of large-interval chain wheel teeth is met through improvement, and meanwhile it is guaranteed that the tooth surface roughness reaches the requirement of Ra1.6 or above.