414 results about "Tooth root" patented technology

The embodiment of the invention discloses a root canal feature form extraction method, device and equipment based on CBCT data and a medium, and belongs to the technical field of stomatology and medical image.The method comprises the steps that filtering denoising and dental pulp segmentation processing are carried out on a CBCT image, and surface drawing three-dimensional reconstruction is carried out on a tooth root canal to generate a three-dimensional model; based on regular point cloud data in the three-dimensional model, adopting a point-surface method to realize curved surface reconstruction, and generating a root canal entity model; and performing coordinate alignment processing on the root canal solid model in a three-dimensional space, and measuring the length of the root canal, the direction of a root canal orifice, the curvature of the root canal and the depth of dental pulp by fitting the approximate center line of the root canal. According to the method, the corresponding three-dimensional model is quickly reconstructed based on the CBCT cross-sectional image obtained by scanning the teeth of the patient, and related data such as the dental pulp depth and the size of the root canal orifice are acquired from the three-dimensional model of the teeth so as to assist the oral surgery.

The invention discloses an impacted wisdom tooth extraction resistance analysis simulation method and system based on CBCT and AI segmentation, is suitable for scenes of extraction resistance intelligent analysis and preoperative path simulation of impacted wisdom teeth, and assesses risks by automatically measuring the minimum spatial distance between the tooth root tip of a wisdom tooth to be extracted and a dental nerve tube. A resistance removal strategy is selected by performing three-dimensional mechanical analysis on adjacent tooth resistance, bone resistance and tooth root resistance of a wisdom tooth to be extracted, and a wisdom tooth extraction simulation path is planned based on a risk assessment result and the resistance removal strategy. According to the method, complex impacted wisdom teeth are analyzed for the first time, risk assessment and three-dimensional mechanical analysis related to an operation are achieved, and special modeling, risk assessment and tooth extraction resistance analysis can be conducted on the impacted wisdom teeth, especially the impacted mandibular wisdom teeth which are high-risk conditions that the shapes of adjacent neural tubes and tooth roots are complex and resistance sources are diversified; the pull-out difficulty, the resistance source and the intraoperative risk point are reflected, and the clinical use requirements are met.

The invention belongs to the field of data processing, particularly relates to a wind turbine generator gear box tooth surface strength optimization method considering multi-working-condition load distribution, and aims to solve the problem that the optimization effect is affected due to the fact that strength optimization checking is carried out only for a single working condition in the prior art. The method comprises the following steps: acquiring working condition data of the gearbox under various preset working conditions; load spectrum decoupling processing is conducted on the working condition data, a dynamic load distribution matrix synchronous with the tooth surface meshing period is determined, stress field conversion is conducted on the dynamic load distribution matrix, and a tooth root bending stress field and a tooth surface contact stress field are obtained; inputting the tooth root bending stress field and the tooth surface contact stress field into a pre-constructed double-constraint optimization model to obtain a tooth surface strengthening parameter tensor output by the model; and inputting the tooth surface strengthening parameter tensor into a preset process mapping system. Based on the method provided by the invention, the multi-working-condition operation data of the gearbox are synchronously obtained for optimization calculation, and the limitation of traditional single load analysis is broken through.

The embodiment of the invention discloses a method for measuring a buccal-lingual torque value of maxillary molar based on improved ResNET. The method comprises the following steps: acquiring and preprocessing three-dimensional images of teeth and alveolar bones, and performing three-dimensional reconstruction on the preprocessed images; based on the coupling relationship between the dental crown and the tooth root, positioning a first tooth long axis; positioning a second tooth long axis based on the coupling relationship between the tooth and the alveolar bone; calculating an included angle between the first tooth long axis and the second tooth long axis and generating a new long axis; calculating and verifying a buccal-lingual torque value of the maxillary molar; through the automatic process, the accurate measurement and calculation of the upper jaw first molar torque value are realized, and the effectiveness and accuracy are improved.

The invention provides a trapezoidal thread parameter measurement method and system based on machine vision. The method comprises the following steps: acquiring a thread image and extracting thread contour features; based on the extracted thread contour features, carrying out tooth crest, tooth bottom and two-side thread profile contour segmentation; performing straight line fitting on the tooth crest contour and the tooth bottom contour of each tooth form to obtain a straight line point set of each tooth crest, then fitting the tooth crest straight line point set in the visible range to obtain a tooth crest straight line, and obtaining a tooth bottom straight line by adopting the same method as the tooth crest; and finally, based on the straight lines of the tooth crests and the tooth bottoms of the threads on the two sides of the to-be-measured rod piece, calculating the central axis of the threads, the tooth crest distance and the tooth bottom distance of the threads on the two sides of the to-be-measured rod piece, the tooth height and the tooth width. The trapezoidal thread tooth crest and the trapezoidal thread tooth bottom are segmented by fusing a graphics method, thread parameter measurement is divided into small-size parameter measurement and large-size parameter measurement, the thread measurement precision is improved while the thread measurement difficulty is simplified, and the adaptability of a visual scheme in trapezoidal thread measurement is enhanced.

The invention belongs to the technical field of gear machining, and discloses a gear milling blade and a disc-shaped milling cutter. The tooth milling blade comprises a side edge, a top edge and an auxiliary edge, wherein the top edge is arranged between the side edge and the auxiliary edge; the outer contour line of the top edge protrudes towards the workpiece to be machined, the outer contour line of the top edge comprises a top edge arc line and an oval arc line, one end of the top edge arc line is connected with the outer contour line of the side edge, and the other end of the top edge arc line is an end point E; one end of the elliptic arc line is connected with the end point E and is tangent to the end point E, and the other end of the elliptic arc line is connected with the outer contour line of the auxiliary blade. The tooth milling blade is provided with an elliptical profile curve, so that the curvature distribution on a tooth root transition curve can be effectively improved, the curvature radius of the tooth root transition curve is increased and the tooth root stress is reduced when a tooth groove is cut, and thus the tooth root strength of an involute gear is improved; and meanwhile, the elliptic arc line and the top edge arc line are connected and tangent at the end point E, so that the outer contour line of the top edge is ensured to be smooth.

The utility model relates to the field of machining tools, and discloses a machining tool for an external spline with side teeth, which comprises an external spline hobbing cutter and an external spline side tooth milling cutter, a plurality of groups of hobbing cutter teeth are arranged on the external spline hobbing cutter along the axial direction, a root digging structure is arranged at the tooth top of each hobbing cutter tooth, and a chamfer is arranged at the tooth root of each hobbing cutter tooth; the external spline side tooth milling cutter comprises a milling cutter rod, a milling cutter blade is installed at the end of the milling cutter rod, an involute-shaped cutting edge is arranged on the milling cutter blade, and a plurality of involute cutting edge teeth are arranged on the cutting edge side by side. The external spline driving shaft capable of machining the spline with the side teeth solves the problem that in the prior art, a cutter capable of machining the external spline of the spline driving shaft in the design does not exist, and the machining requirement of the external spline with the side teeth cannot be met.

The invention relates to the technical field of digital medical treatment, and discloses a dental three-dimensional identification and model generation method based on CBCT and deep learning, and the method comprises the steps: carrying out the preprocessing of obtained CBCT image data; the preprocessed CBCT image data is segmented, and the segmentation step comprises the substeps that a tooth three-dimensional model, an alveolar bone three-dimensional model and a mandibular neural tube three-dimensional model are obtained by adopting a two-stage cascade deep learning network; based on the tooth three-dimensional model and the alveolar bone three-dimensional model, obtaining a periodontal membrane three-dimensional model through geometric and Boolean operation; a tooth root area in the tooth three-dimensional model is positioned, and a self-adaptive threshold method is adopted for CBCT image data corresponding to the tooth root area, and a root canal three-dimensional model is recognized and generated; based on at least one of the obtained three-dimensional models, a personalized clinical application model is generated, high-precision automatic segmentation of the dental complex anatomical structure is achieved, and a reliable digital model basis is provided for personalized precision medical treatment.

The utility model provides a curettage tool for apical surgery, which comprises a handle, a neck part and a curettage head, the handle is connected with the curettage head through the neck part, the neck part is bent by 80-100 degrees, the curettage head is shovel-shaped, and one end of the curettage head far away from the neck part is provided with a tip. Through the shovel-shaped design of the digging spoon head, the digging spoon can extend into the position where tooth roots are difficult to scrape, and the problem that the included angle between the root tip lesion lingual side and the tooth surface is an acute angle and is difficult to scrape thoroughly is solved. By means of the specially designed angle, diseased tissues right behind and behind the tooth root can be scraped more effectively, residues of granulation tissues can be reduced, the healing speed of root apex bone defects is increased, and the operation efficiency is improved.

The invention discloses a method for calculating the strength of an end face tooth coupling of an energy storage centrifugal compressor, relates to a method for calculating the strength of an end face tooth coupling, and aims to solve the problem that a method for accurately judging whether the strength of the end face tooth coupling of the compressor is qualified or not by a conventional end face tooth calculation and checking method does not exist at present. The method is implemented according to the following steps that firstly, axial component force generated when the end face teeth transmit torque is obtained; 2, the axial expansion difference of the end face teeth, the main shaft and the screw at the working temperature is calculated, and the actual pre-tightening force of the screw during unit operation is calculated; 3, impeller thrust generated by the front and back pressure difference of the impeller is calculated, the effective tooth surface area of the end face teeth is calculated, and the end face tooth root bending stress, the end face tooth maximum extrusion stress and the end face tooth axial tensioning force safety coefficient of the centrifugal compressor are calculated; and 4, judging the strength of the end face tooth coupling of the energy storage centrifugal compressor. The invention belongs to the field of end face tooth coupling checking.

The invention discloses a detection method and device of a tooth root stress test system and a medium, the tooth root stress test system comprises a plurality of tooth root stress detection units, the tooth root stress detection units are attached to the surface of a tooth root, each tooth root stress detection unit comprises a plurality of strain gauges, and each strain gauge comprises a positive terminal and a negative terminal; in the same tooth root stress detection unit, the strain gauges are connected in series; the detection method of the tooth root stress test system comprises the following steps: acquiring a current total resistance value of the tooth root stress detection unit and a theoretical total resistance value after the strain gauges are connected in series; judging whether the difference value between the current total resistance value and the theoretical total resistance value is within a first difference value preset range or not; and if yes, determining that each strain gauge in the tooth root stress detection unit is normally insulated.

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 utility model relates to the technical field of gear detection, and discloses a gear thickness detection device which comprises a bottom plate, the upper surface of the bottom plate is fixedly connected with an L-shaped plate and a supporting plate, the other end of the L-shaped plate is connected with a detection mechanism, the upper end of the supporting plate is connected with a rotating mechanism, and one end, close to the L-shaped plate, of the rotating mechanism is connected with a moving mechanism. The other end of the moving mechanism is connected with two clamping assemblies, the other ends of the two clamping assemblies are connected with clamping rods, and the two clamping rods are parallel up and down. According to the gear thickness detection device, when the tooth thickness of a gear needs to be detected, only the clamping assembly needs to be controlled to move through the moving mechanism, then the gear can be clamped from the two sides through the two clamping rods, then the height of a tooth root is detected through the detection mechanism, and after the gear is controlled to rotate by a certain angle through the rotating mechanism, the gear thickness is detected. And the height of the tooth crest is detected through the detection mechanism, and finally the height difference between the tooth root and the tooth crest is obtained, so that the tooth thickness can be directly obtained, and convenience and rapidness are achieved.

The invention discloses a method and device for intelligently achieving implant anchorage position generation, and the method comprises the steps: carrying out the fusion of oral cavity CBCT data and oral scanning model data, obtaining a fusion three-dimensional model, and carrying out the registration of the oral cavity CBCT data and the oral scanning data based on a non-rigid I CP algorithm during the fusion; performing feature point extraction on the fused three-dimensional model to obtain a feature point heat map, performing risk region division on the fused three-dimensional model to obtain a risk region, determining a bone mineral density grading map based on the fused three-dimensional model, and dividing a tooth root three-dimensional safety boundary; determining at least one target feature point based on the feature point heat map, the risk area, the bone mineral density grading map and the tooth root three-dimensional safety boundary, and determining implant anchorage position information corresponding to the target feature point based on the target feature point; and screening out an optimal implant anchorage target position from the implant anchorage position information. The purpose of intelligently determining the position of the implant anchorage is achieved, and the defects in the related technology are overcome.

The invention discloses an involute helical gear forming grinding force prediction method, which comprises the following steps: firstly, based on a helical gear forming grinding space motion relationship, establishing a helical tooth surface model comprising an involute surface and a tooth root transition curved surface, and constructing a geometric contact model of a grinding wheel and a gear; then, tooth surface deformation data obtained after heat treatment are obtained through a three-coordinate measuring machine, coordinate mapping is carried out, and the grinding depth and contact parameters are corrected; on the basis, a grinding force integral model considering the heat treatment influence is established by combining a plane grinding mechanism, and integral calculation is carried out on tangential and normal grinding force of a tooth surface involute section, a transition arc section and a tooth bottom section; finally, actual measurement data are obtained through a grinding experiment, and model parameter calibration is completed. According to the method, dynamic and accurate prediction of tangential and normal grinding force in the bevel gear forming and grinding process can be achieved, and a reliable basis is provided for mechanical behavior analysis and process optimization in the gear machining process.

The utility model provides a dental instrument which comprises a shell-shaped body with a plurality of tooth containing cavities, the shell-shaped body further comprises an extension part and a traction part, the extension part is formed by extending the edges of the tooth containing cavities towards the gingiva direction, the traction part protrudes from part of the surface of the extension part towards the far-tooth direction to form a cavity structure, and in addition, the traction part is connected with the extension part. The traction part and the edge of the extension part are arranged at an interval; the side surface of the traction part is provided with a containing cavity used for hanging a traction piece, and when the traction device is worn, the extension part covers and wraps part of gingiva. The traction part in each embodiment of the utility model not only can replace the function of an anchorage nail to provide anchorage force or orthodontic force, but also solves a series of negative effects that in the prior art, an implanting nail needs to be driven into a tooth root, and trauma is caused to the interior of the mouth of a patient.

The invention relates to an orthodontic tooth division accurate measurement method and system based on digital scanning, and the method comprises the steps: collecting the initial three-dimensional scanning data of teeth of a patient, and obtaining the dynamic change data of the teeth; performing association mapping processing on the tooth dynamic change data to obtain a tooth space position file; based on the tooth space position file, adopting an iterative comparison algorithm to be matched with subsequent scanning data, and judging deviation values of tooth gap width and tooth root inclination in an orthodontic process; the deviation value is analyzed, and real-time dental arch curve adjustment parameters are obtained; based on the real-time dental arch curve adjustment parameters, determining an optimization direction of an individualized tooth division scheme; and performing feedback circulation on the overall tooth space position file by adopting the optimization direction to obtain a final dynamic integration measurement result. According to the invention, through fusion of deep learning and time sequence analysis, accurate tracking of dynamic changes of teeth is realized.

The invention discloses a design and preparation method of a personalized gradient thickness invisible orthodontic appliance model, relates to the technical field of tooth orthodontics, and aims to overcome the defects that the thickness is uncontrollable and preset mechanical properties cannot be accurately realized when an invisible orthodontic appliance is manufactured by a traditional hot press molding process. The method comprises the following steps: firstly, reconstructing a personalized dental model containing tooth roots and bone tissues based on CBCT data of a patient; designing a plurality of gradient thickness appliance schemes; through finite element analysis and simulation, selecting an optimal scheme which is most favorable for realizing correction effects such as overall movement of teeth; and finally, integrally forming and manufacturing the selected appliance by adopting a direct 3D printing technology. The direct 3D printing ensures that the appliance can be manufactured in a high-precision and high-fidelity manner from a complex gradient thickness structure with thick gingiva and thin occlusal surface, so that the optimized mechanical property verified by simulation can accurately reproduce in a real object, the inherent defects of a hot-pressing film process are thoroughly overcome, and the accuracy and predictability of correction are remarkably improved.

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 bionic stubble cutting knife, a bionic stubble cutting knife device and a design method, and relates to the technical field of agricultural machinery, the bionic stubble cutting knife comprises a knife disc base body and a plurality of knife teeth uniformly distributed along the circumference of the knife disc base body in the same direction, each knife tooth comprises a main cutting edge, a tooth tip, a knife back and a tooth root reinforcing rib which are connected in sequence, and the angle of the main cutting edge imitates the upper jaw of a earwig. The outer contour curve of the cutter tooth is formed by sequentially connecting a main cutting edge curve, a tooth top curve, a cutter back curve and a tooth root reinforcing rib curve in a transition mode, and the connecting points of the curves are tangent. The bionic stubble cutting knife device comprises a bionic stubble cutting knife, a connecting structure, a vibration reduction structure, a connecting spring and a driving device, and the vibration reduction structure adopts a two-stage composite vibration reduction system. Through a bionic cutting structure, a two-stage vibration reduction system and a flexible adaptive design, cooperation of efficient cutting, stable operation, cost reduction, efficiency improvement and environmental protection is achieved, a better solution is provided for agricultural stubble cutting operation, and technological upgrading of agricultural machinery equipment is promoted.

The invention provides an efficient gear strength detection device for a rotary speed reducer, and belongs to the technical field of gear strength detection. The efficient gear strength detection device for the rotary speed reducer comprises a detection table, placement seats and clamping seats, the placement seats are symmetrically and fixedly installed on the surface of the detection table, the clamping seats are fixedly installed on the surfaces of the placement seats, tooth grooves are formed in the inner walls of the clamping seats, a testing mechanism is installed on the surface of the detection table, and the testing mechanism comprises a sleeve shaft, a moving seat and a pulling plate. According to the invention, the testing mechanism is arranged, the to-be-tested gear is engaged with the tooth groove part of the clamping seat, the to-be-tested gear is positioned, the positioning block is driven to extend out of the sleeve shaft, the to-be-tested gear is longitudinally positioned, the two-way screw rod can be driven to rotate through the second motor, the teeth on the two sides are driven to be synchronously inserted into the tooth root part of the to-be-tested gear, and the detection efficiency is improved; the first motor drives the pulling plate and the pulling rod to move backwards, pulling force is applied to the tooth root of the gear to be detected, the strength of the gear is detected, and use is convenient.

The invention relates to a geometric parameter optimization design method for a large-overlap-ratio gear, and belongs to the field of vehicle transmission design. According to the technical scheme, the geometric parameter optimization design method for the large-overlap-ratio gear comprises the following steps that S1, initial parameters of a gear pair are determined according to the speed ratio requirement and the center distance; s2, dense tooth optimization is carried out according to the tooth root strengthening effect; s3, the addendum circle is determined according to the requirement of the sliding rate # imgabs0 #; s4, distributing tooth thickness according to fatigue life and backlash requirements; s5, determining a dedendum circle according to a top clearance requirement; and S6, performing tooth root transition curve optimization and hob design according to the re-determined gear parameters, and performing hobbing simulation verification. According to the scheme, gear tooth high-strength design and dense tooth optimization are achieved through a tooth root transition curve optimization method, the meshing efficiency and the transmission stability are further considered, the tooth height is controlled and optimized through the sliding rate, the tooth thickness and the backlash are distributed by balancing the fatigue strength of the paired gear, and the macroscopic geometric parameter optimization design of the gear is achieved.

Electric motor device (10) for driving a sunroof (2) or a roller blind in a vehicle (100), comprising: a rotor device (20) comprising an at least partially cylindrical outer surface (21); a stator device (30) having a core (31) including a plurality of stator teeth (32) projecting toward the rotor device (20), the stator teeth (32) comprising a tooth root (33) connected to a stator ring (34) and a tooth tip (35) having a wing-shaped tooth shoulder (36) on each side in a circumferential direction, the wing-shaped tooth shoulder (36) having a tip (37) formed at an end portion (47) of the respective wing-shaped tooth shoulder (36) in the circumferential direction; wherein the tooth tip (35) includes a surface (39) facing the at least partially cylindrical outer surface (21) of the rotor device (20) to form a gap (40) therebetween; wherein the surface (39) comprises: - a hollow cylindrical surface section (41) having a constant gap distance (g1) in the direction of the at least partially cylindrical outer surface (21) of the rotor device (20) in the circumferential direction, and - each having an inclined surface portion (42) having an increasing gap distance (g2) with respect to the at least partially cylindrical outer surface (42) of the rotor device (20) in the circumferential direction towards the respective tip (37) formed by the end portion in the circumferential direction; wherein the hollow cylindrical surface portion (41) includes a first radius (r1) with respect to a center axis (C) of the rotor device, and the tip (37) formed at the end portion in the circumferential direction has a second radius (r2) with respect to the center axis (C) of the rotor device (20); wherein a first ratio (r2 / r1) between the second radius (r2) and the first radius (r1) is 1.02 or more and 1.08 or less.

The application discloses a burr cleaning equipment for gear machining, and belongs to the technical field of gear machining, and the technical key points are as follows: the burr cleaning equipment comprises a bottom plate, a gear positioning mechanism and a gear polishing mechanism are arranged, and the gear body can be clamped and fixed in a self-adapting mode according to the inner diameter of the gear during burr cleaning, manual intervention is greatly reduced, the labor intensity of an operator is reduced, and the synchronous burr cleaning mode for the tooth surface, the tooth top and the tooth root reduces the corresponding clamping frequency and adjustment time, and the overall machining efficiency is significantly improved; the gear taking mechanism can quickly and stably complete gear grabbing, discharging and grabbing feeding operations, the movement characteristics of the multi-degree-of-freedom moving assembly can significantly shorten the single feeding and discharging time, the production efficiency is significantly improved compared with traditional equipment, and the burr cleaning equipment has the advantages of convenient gear taking and placing, high automation degree and high working efficiency.

The present application relates to gear processing forging equipment technical field, specifically a kind of temperature monitoring function's gear processing is forged device, and the forging device includes first forging machine, second forging machine, manipulator, test table, first forging machine is processed into intermediate body by hollow cylindrical raw material block, second forging machine is placed in first forging machine side, second forging machine is processed into gear-shaped forming body by intermediate body, test table is placed in second forging machine side, test table tests the tooth root toughness in the meshing process of forming body, manipulator is set between first forging machine, second forging machine, test table for transferring workpiece.Raw material block is heated to forging point using resistance heating mode, resistance heating electrode is set in first forging machine and second forging machine, first forging machine and second forging machine are with infrared probe to identify the temperature of raw material block and intermediate body in heating process.After obtaining intermediate body, the outer edge of heated intermediate body, so that the material that becomes tooth surface finally in second forging process is based on the material of original outer edge.

The present invention discloses a bevel gear numerical calculation method, system, device and readable storage medium. The bevel gear numerical calculation method includes: obtaining gear parameter information; constructing a finite element model according to the gear parameter information and calculating the overall stiffness matrix of the finite element model; calculating the meshing force of the meshing nodes at different rotation angles by using the loaded contact analysis method according to the gear parameter information; applying fixed displacement boundary conditions to the internal gear ring of the gear in the finite element model to simulate the stationary state of the internal gear ring of the gear; mapping the meshing force of the meshing nodes at different rotation angles to the tooth surface of the finite element model to obtain the tooth surface meshing force result, so as to realize the distribution of the meshing force on the tooth surface; calculating the gear deformation result according to the overall stiffness matrix and the tooth surface meshing force result; and calculating the tooth surface contact stress and the tooth root bending stress based on the gear deformation result. The bevel gear numerical calculation method of the embodiment of the present invention can calculate the tooth surface contact stress and the tooth root bending stress efficiently and accurately.

A dental implant assembly comprising an elongated inner body substantially resembling a tooth root (1-1) and an outer member for securing to a bone of a patient (1-2) having a heterogeneous porous structure adapted to provide bone growth, the inner body and the outer fixation member being formed in one piece, the fastening element being movable between a stored passive position and an extended active position (1-2).

The large-modulus hardened gear ring structure comprises a gear ring and gear teeth arranged on the inner wall of the gear ring, one end of each gear tooth is a first tooth end, the other end of each gear tooth is a second tooth end, a first step is arranged on one side of each first tooth end, the first step is arranged on the inner wall of the gear ring, and the second step is arranged on the inner wall of the gear ring. A cutting groove is further formed between the first tooth end and the first step and connected between the first tooth end and the first step in a transition mode, the side face, close to the first tooth end, of the cutting groove and the axial end face of the first tooth end are located on the same vertical face, and the bottom end of the first step and the tooth root of the first tooth end are located on the same vertical face. A second step is arranged at the end, away from the first step, of the gear ring and arranged at the joint of the second tooth end and the gear ring, and the axial end face of the second step and the axial end face of the second tooth end are located on the same horizontal plane. According to the device, broken cutting caused by heat treatment deformation of the first tooth end and the second tooth end is reduced, so that the production efficiency of the large-modulus hardened gear ring is improved.

The removable anti-loosening false tooth comprises a false tooth main body, a tooth root connecting block is arranged at the bottom of the false tooth main body through a connecting groove with internal threads, and a tooth root sleeve for performing outer protection positioning on the tooth root connecting block is arranged at a bottom port of the connecting groove and located at the bottom of the false tooth main body; through the false tooth main body, the connecting groove, the tooth root connecting block, the tooth root main body and the threaded connecting part, the false tooth main body is fixed on the threaded connecting part on the tooth root connecting block through threads of the connecting groove for connection and fixation, so that the false tooth main body and the tooth root connecting block can be quickly fixed, and the tooth root sheath is positioned and sleeved outside the tooth root connecting block for protection; according to the structural connection mode, the false tooth main body only needs to be screwed to be separated from the tooth root connecting block in the picking and replacing process, so that the worn false tooth main body can be conveniently picked and replaced, and the problem of gingival injury caused by picking and replacing by virtue of a tool is avoided.

The application discloses a high-bearing low-noise special gear precision machining process, which comprises the following steps: precision die forging and isothermal normalizing, double-reference composite finish turning, self-adaptive roll-scrub composite near-net forming, segmented and partial-pressure gradient carburizing and quenching, deep cryogenic graded aging, reference reconstruction flexible honing polishing, pulse laser shock strengthening, tooth root fillet roll strengthening, full-parameter precision detection, hierarchical selection and micro-correction. The application solves the problems of large deformation, low precision, poor fatigue and high noise in traditional processes through the synergistic control of forming-stress-precision-surface morphology, and the special tooth profile is stably up to DIN 4-5 level, the tooth surface is Ra≤0.2 microns, the fatigue life is increased by more than 60%, and the noise is reduced by 6-10 dB. The process combination is not obvious and has outstanding creativity, and is suitable for high-precision batch manufacturing of special gears of high-end equipment such as new energy vehicles and high-speed heavy-duty transmission.