最新刊期
期 4 ， 2022
- 摘要：Tooth surface friction has an important impact on the scoring，macro and micro pitting corrosion and transmission efficiency of meshing gear pairs. The research on the calculation and control method of tooth surface friction has significant engineering significance for the performance optimization and efficiency improvement of meshing gear pairs. It is precisely based on the important role of tooth surface friction that many scholars at home and abroad have conducted comprehensive studies on the calculation of friction coefficient and the influence of tooth surface friction on the contact damage and dynamic characteristics of meshing gear pairs. However，there is still no unified calculation method and design specification，there are still many technical research deficiencies，and it is still difficult to obtain reliable application in engineering. By summarizing relevant technical literatures at home and abroad，the current research status of tooth surface friction is expounded，the difficulties and hotspots in the research are sorted out， the development trend of tooth surface friction is predicted， and reference technical direction for further research on tooth surface friction is provided.关键词：Gear transmission;Friction coefficient;Friction force
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发布时间：2022-09-25 - 摘要：Rehabilitation exoskeleton robots are mainly applied to patients with dysfunctional limb movements，and patients can complete rehabilitation treatment through phased，scientific and precise training of the exoskeleton. However，there are many types and forms of rehabilitation exoskeleton robots on the market at present，and how to categorize them will become a difficult problem. The domestic and international research progress of rehabilitation exoskeleton robots in recent years is summarized. The current representative rehabilitation exoskeleton robots are classified according to their different assisted positions in the human body； A detailed overview of different driving methods of rehabilitation exoskeleton robots is given and the current research status of different driving methods are analyzed； The targeted training mode of the rehabilitation exoskeleton robot is analyzed from the perspective of adopting the corresponding training mode according to the stage of rehabilitation treatment. The technical difficulties in current exoskeleton rehabilitation treatment is summarized and provides an outlook， aiming to provide a reference for future research on rehabilitation exoskeleton robots.关键词：Rehabilitation therapy;Exoskeleton robot;Driving mode;Targeted training;Limb rehabilitation
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发布时间：2022-09-25 - 摘要：Compared with the worm wheel gear grinding，gear form grinding is suitable for high efficiency grinding of large diameter and large modulus gears，despite difficulties concerning with grinding precision control，precise modification of tooth profile and precision detection in machine. Reviewing the research and development of gear form grinding tooth surface error control at home and abroad， the research achievements and existing problems at home and abroad in recent years from the three error sources which are the grinding wheel dressing system error，gear grinding system error and on-machine inspection system error are discussed， proposes directions and contents that need further research which are the construction of a closed-loop grinding system of “grinding wheel dressing，gear form grinding，on-machine evaluation of tooth surface error，reverse traceability of machine tool errors & error tracking compensation” and the realization of the improvement of grinding accuracy and dressing accuracy，carries out research on tooth surface error mapping modeling，tooth surface error on-machine evaluation and tooth surface error tracking correction method，and optimizes the on-machine inspection and compensation system. Being familiar with the research and development status of gear form grinding error compensation is beneficial to key technology breakthroughs in the development of high precision gear form grinding and gear testing equipment.关键词：Gear form grinding;Tooth surface error;Grinding wheel dressing system;Tooth surface modification;On-machine inspection;Error control
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发布时间：2022-09-25
Review
- 摘要：A thermal network model of the helicopter main reducer under high-speed and heavy-load conditions is established，and the law of the temperature field of the spiral bevel gear with different tooth surface structures is obtained. Load contact analysis （LTCA） on the tooth surface of the spiral bevel gear based on the active design is performed to obtain the load between the teeth. Also，the friction coefficient and thermal load of the bevel gear are obtained by tribology and heat transfer. And the influence law of the direction of the bevel gear tooth surface contact trace，the length of the semi-major axis of the contact ellipse and the first derivative of the transmission ratio on the temperature field of the bevel gear is studied and analyzed.关键词：Spiral bevel gear;Thermal network method;Steady temperature field
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发布时间：2022-09-25 - 摘要：Hysteresis stiffness is an inherent property of harmonic gear drive. In the traditional dynamic modeling of harmonic gear drive，the stiffness is considered as fixed stiffness or piecewise fixed stiffness，which will lead to reduction of the accuracy of the dynamic model. Considering the nonlinear hysteretic characteristics of harmonic drive stiffness， a new hysteretic stiffness model of harmonic gear drive based on genetic characteristics is proposed. The characteristic of the model is that the transmission stiffness is related to the state experienced by the system. Based on the experimental data，particle swarm optimization algorithm is used to identify the model parameters. Taking a certain type of harmonic reducer as the experimental object， the load/unload performance of a harmonic reducer is tested. The fitting results show that the nonlinear hysteretic stiffness model is in good agreement with the experimental data， and the accuracy is greatly improved compared with the traditional model.关键词：Harmonic gear drive;Hysteresis stiffness model;Particle swarm optimization algorithm
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发布时间：2022-09-25 - 摘要：A dynamic model of journal bearing rotor system with roundness error is established，and a new generalized roundness error equation is derived based on the small displacement theory （SDT）. The Reynolds equation is solved numerically under the Swift-Stieber boundary conditions，and the influence of the spin parameter of roundness error dx，which is characterized by SDT，on the oil film pressure，bearing capacity，critical speed and stability of sliding bearing is analyzed emphatically. The results show that the maximum oil film pressure is changed by the spin parameter of roundness error， and the oil film pressure increases with the increase of the spin parameter； in addition， the existence of journal roundness error is beneficial to the bearing capacity and stability of sliding bearing rotor system to a certain extent； among them，when eccentricity ε<0.8， the influence of journal roundness error on the bearing capacity of the system is more obvious，and when Sommerfeld number S>0.6， the influence of journal roundness error on the stability is less； at the same time，the critical speed of the system will increase with the increase of screw parameter，especially when eccentricity ε>0.6.关键词：Small displacement theory（SDT）;Sliding bearing;Roundness error;Oil film characteristic
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发布时间：2022-09-25 - 摘要：Aiming at the defect that the traditional artificial potential field method（APF） is easy to fall into the local minimum in the obstacle avoidance path planning of the 6-DOF dual-manipulator system，an improved APF algorithm combined with an improved rapidly-exploring random trees（RRT） algorithm is proposed for obstacle avoidance path planning. The working space of the dual-manipulator system is analyzed，and the possibility of the interference of the dual-manipulator system is confirmed. For the path planning of the dual-manipulator，the improved APF is used to plan the path of the main manipulator，and it is used as the dynamic obstacle of the slave manipulator to plan the motion path of the slave manipulator. The improved RRT is used to adaptively select the temporary target points to solve the problem of falling into the local minimum when planning the path of the slave manipulator. The improved APF is used to plan the remaining path of the slave manipulator. Simulation analysis shows that the improved APF-RRT algorithm can solve the obstacle avoidance path planning problem of the dual-manipulator system more quickly and accurately than the traditional algorithm.关键词：Dual-manipulator;Artificial potential field;RRT;Path planning;Local minimum;Temporary target point
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发布时间：2022-09-25 - 摘要：Oil churning lubrication is an important lubrication method of gear system. Considering the viscoelasticity of the lubricant oil will result in additional resistance upon gears immersed in the oil while running at high-speed，and the gear system can get disturbed at all times due to self-exciting vibration and other factors. Thus，considering the backlash，time-varying mesh stiffness，transmission error，stochastic disturbances，oil churning resistance and other nonlinear factors， compares and analyzes the influence of oil churning resistance upon dynamic characteristics of the gear system under stochastic disturbance by establishing a nonlinear dynamic model of straight gears with 6 degrees of freedom and using by Lagrange method using the bifurcation diagram，phase diagram，Poincarè diagram，time-history graph and dynamic load factors （DLF） obtained by the R-K method. The results show that stochastic disturbances can change the chaotic characteristics of the system，and its influence on the phase diagram is particularly obvious，the trajectory shape remains the same，but the periodicity is significantly affected and the periodic motion turns to quasi-periodic motion. When the condition of being under stochastic disturbances is considered as a normal working state，the oil churning resistance can make the system enter the chaotic state in advance.关键词：Nonlinear;Stochastic disturbance;Oil churning resistance;Bifurcation;Chaos
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发布时间：2022-09-25
Theory·Reserach
- 摘要：In order to study the influence of multiple clutches on the transmission efficiency of a hydro-mechanical continuously variable transmission （HMCVT），the structure characteristics of a closed loop consisting of multiple wet friction clutches in the transmission are investigated. The influence of clutch drag torque on the efficiency characteristics of hydro-mechanical CVT is analyzed. By analysis and calculation of the drag torque generated in the clutch disengagement stage，which affects the transmission efficiency，a calculation model for power transmission in the clutch disengagement stage in a closed loop is established，a calculation formula for power loss caused by clutch drag torque in closed transmission is deduced and a calculation method for the total efficiency of the transmission system is further derived. The calculation results show that the band and row loss of multiple friction clutches in HMCVT has a great influence on its transmission efficiency.关键词：HMCVT;Clutch;Drag torque;Efficiency characteristic
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发布时间：2022-09-25 - 摘要：For the helicopter transmission shaft system，it is usually necessary to carry out a variety of scheme comparison and influence parameter analysis during the design stage to obtain a relatively better design scheme. However，due to large calculation workload and low efficiency of the finite element method，it is necessary to develop a fast and accurate analysis method for the critical speed of the helicopter transmission shaft. Taking the helicopter oblique tail drive shaft as the research object，and considering bending moment，lateral displacement，shear distortion，moment of inertia，gyroscopic moment and axial force，etc. a calculation model for the critical speed of the tail drive shaft is established and a calculation formula for the critical speed is derived. By comparing calculation results of several analysis models，the influence law among various influence factors upon the critical speed of the tail drive shaft is obtained and a suggestion for the selection of critical speed analysis method of helicopter tail drive shaft is also given.关键词：Helicopter;Tail drive shaft;Critical speed;Calculation method
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发布时间：2022-09-25 - 摘要：In order to solve the problem that the complex structure and operating conditions of planetary gear box lead to the difficulty of signal fault feature extraction， the frequency spectrum feature of gearbox vibration signal with faults is preliminarily deduced by analyzing the vibration mechanism of planetary gear train. The method of harmonic product spectrum （HPS） and sideband product spectrum （SPS） is used to accurately extract the fault characteristic frequencies of the simulation signals under the condition that the noise interference and fault impact are not obvious. The vibration signals of the planetary gearbox under different operating conditions and different fault states are further collected，and the extracted fault features are input into the convolutional neural network for fault identification. The fault information of the gearbox is obtained successfully，which proves the feasibility of the proposed method in fault diagnosis of the planetary gearbox.关键词：Planetary gear train;Fault feature extraction;Harmonic product spectrum;Sideband product spectrum;Convolutional neural network
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发布时间：2022-09-25 - 摘要：A herringbone gear transmission system is taken as the research object. A method of gear system-level modeling and simulation analysis is proposed. Based on the finite element node method，a dynamic model considering rigid rotor-shaft-bearing and the meshing of gears is established. Then the resonance speed of the system is analyzed and the result is compared with the experimental data to verify the reliability and limitations of the finite element node model. Then a 3D finite element model used for natural frequency calculation and vibration mode analysis is established. The modeling of gear meshing is used in finite element node method. Finally，combined with the modal analysis and response analysis，the theoretical analysis is compared with the experimental data. And the cause of experimental resonance is determined and resonance localization is realized，which provides direction for decreasing the vibration amplitude and avoiding the vibration.关键词：Finite element node method;Response analysis;3D finite element model;Modal analysis;Resonance
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发布时间：2022-09-25 - 摘要：Considering that the sorting of goods is time-consuming，laborious and not accurate enough，a UPS/UPR/SP parallel mechanism is proposed，which is considered to be applied in the field of packaging sorting to liberate both hands. Firstly，the degree of freedom of UPS/UPR/SP parallel mechanism is analyzed by using screw theory，and the degree of freedom of the mechanism is analyzed and verified based on the improved Kutzbach-Grübler formula； then，particle swarm optimization （PSO） algorithm and closed vector method are used to solve the forward and inverse solutions of the mechanism，and the reachable workspace of the mechanism is solved by using the limit search method in Matlab software； Finally，the mechanism is applied to the express sorting with high accuracy of position accumulation. The results show that the UPS/UPR/SP parallel mechanism has three degrees of freedom of two rotations and one movement，the end movement of the moving platform is accurate，and the workspace is continuous and uninterrupted. The mechanism is flexible and can fully meet the requirements of express logistics.关键词：UPS/UPR/SP;Parallel mechanism;Inverse position analysis;Forward position analysis;Workspace;Sorting
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发布时间：2022-09-25 - 摘要：Considering the support deformation of the gearbox，shafting and the thermal deformation of gear transmission system，the amount of gear meshing misalignment is calculated. Force analysis of the gearbox is carried out by finite-element software，the contact analysis of gear pair is carried out，gear shaft displacement is calculated by mechanics principle and finite-element node method，the thermal deformation of the profile contact line is calculated，and the change of contact displacement of gear profile by finite-element thermoelastic coupling is analyzed. The gear is modified and optimized，the experimental results are compared. The results show that the gear system meshing dislocation is the comprehensive effect of the deformation of each part； the gear modification optimization can help to reduce the gear system meshing misalignment，the gear shaft offset and the gear transmission error，and improve the stability and reliability of gear transmission.关键词：Thermal deformation;Finite element node method;Thermoelastic coupling;Modification
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发布时间：2022-09-25 - 摘要：The characteristics of temperature rise of deep groove ball bearing under working condition are studied. By analyzing the influence of groove curvature radius，degree of closure and other parameters on the heat generation of the ball bearing，the size parameters such as inner ring groove radius （inner groove curvature radius） and outer ring groove radius （outer groove curvature radius） are optimized through the modification design of the bearing structure. The relationship between the curvature radius coefficient of inner and outer groove and the working temperature of bearing under different bearing pressure and rotating speed are obtained by experimental method. The results show that the curvature coefficient of the inner and outer ring channel has a great influence on the temperature rise of the bearing. The study provides a reference for optimizing the contact matching between the inner and outer grooves of the bearing and the steel ball，enabling a better lubrication of the bearing working surfaces，further improving its heat dissipation conditions，reducing sliding friction to reduce the friction torque and noise of the bearing，so as to realize the high speed，high efficiency，low power consumption and low noise of the bearing. The research results have guiding significance for parameter optimization of high speed deep groove ball bearing.关键词：High speed ball bearing;Groove curvature;Radius coefficient;Temperature rise characteristics
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发布时间：2022-09-25
Test·Analysis
- 摘要：The development and application of new configurations inspired by the folding principle of origami is increasingly becoming a research hotspot in related fields. Among them，the design of plane crease，the folding of three-dimensional shape，the motion characteristics of configuration，the degree of freedom and the corresponding driving design are all scientific problems to be solved. Based on the classic Water-Bomb origami basic unit，the plane crease of the non-convergence foldable unit with single degree of freedom is designed. The combination design and three-dimensional （3D） folding design of the basic crease are carried out，and two kinds of 3D units with certain stiffness and folding motion are obtained，namely the foldable prismatic pair and the foldable rotation pair. At the same time，inspired by the foldable rotation pair，a software actuator cooperating with the basic non-convergence unit is designed，and combined with two kinds of 3D units，a stable control of the 3D units is realized. In the experiment，it is found that the control of the input angle of the 3D unit by the software actuator can control the stiffness of the 3D unit simultaneously. The origami leg and walking robot are designed by connecting the two kinds of three-dimensional units in series，and the walking simulation experiment and the step crossing experiment of the robot are implemented. The maximum margin of the origami leg of crossing the step is obtained，and the special performance of the two kinds of variable stiffness units in the process of walking and stepping is verified.关键词：Water-Bomb origami;Origami mechanism;Origami led;Soft actuator;Variable stiffness
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发布时间：2022-09-25 - 摘要：Aiming at the maintenance of dangerous parts of transmission tower，a new climbing robot is designed. According to the motion environment and clamping mode of the climbing robot，a composite structure combining magnetic adsorption and mechanical clamping is designed to ensure the reliability and accuracy of clamping. The clamping claw is driven by a motor and drives the screw elevator to move up and down through gear transmission，so as to realize the clamping of the claw to the angle steel. At the same time，the electromagnet adsorbs the angle steel to realize the double clamping of the angle steel，which effectively resists the danger of overturning and falling off of the climbing robot on the iron tower. The design process of electromagnetic adsorption clamping gripper is introduced，the three-dimensional model of gripper is established，the static analysis and simulation of gripper are carried out，and its rationality is verified by experiments.关键词：Climbing robots;Clamping mechanism;Simulation analysis
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发布时间：2022-09-25 - 摘要：Aiming at unmanned regions such as mine and space，a quadruped parallel mobile robot with self-recovery ability after overturning is presented. The leg structure of the quadruped robot is composed of a reconfigurable spatial six-bar mechanism，which consists of two improved spherical five-bar mechanisms connected in parallel and has two different motion configurations，the motion configuration I has three degrees of freedom （1R2T），which satisfies the degrees of freedom requirements of the leg walking mechanism for the quadruped robot，and the motion configuration II has two degrees of freedom and a larger workspace，which satisfies the workspace conditions needed for the robot to rolling over. Based on screw theory，the geometric constraints of the spherical five-bar mechanism and the reconfigurable six-bar mechanism are analyzed. These two motion configurations have the interlocking performance. The inverse kinematics of the reconfigurable six-bar mechanism is analyzed using D-H method，and the workspace is obtained. The realizability of the robot rolling over is verified. The rolling over gait of the quadruped robot is analyzed. The relationship between the rotation angles of the leg motors and the center of gravity of the robot body is obtained when the quadruped robot recovers itself after overturning. During the rolling over process of the quadruped robot，the reconfigurable six-bar mechanisms of its legs are all in the motion configuration II. The dynamic model of the quadruped robot is established to verify the correctness and rationality of the preset rolling over gait.关键词：Parallel mechanism;Spherical five-bar mechanism;Reconfigurable six-bar mechanism;Quadruped robot;Geometric constraint;Rolling over gait
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发布时间：2022-09-25 - 摘要：In view of the complexity of parameters and modeling stratification of the eight-link robot leg configuration mathematical model，a simplest eight-link leg mechanism with composite hinges is proposed. Maintaining the characteristics of the closed-loop kinematic chain，the simplest eight-bar kinematic chain is obtained by local contraction of the general eight-bar kinematic chain，and the robot leg mechanism is designed based on one of the simplest eight-bar linkage mechanisms. The end trajectory curve task point method is used to calculate the size of the leg configuration and the vector ring method is used to carry out the kinematic analysis of the leg mechanism with determined parameters. A simulation model of the robot is established，and a walking simulation analysis of typical ground environment is carried out based on Adams software. On this basis，a prototype is built，and an adaptive walking test is carried out on the actual road，which verifies the feasibility of this configuration. At the same time，it confirms the advantages of the simplest eight-link mechanism with less mathematical parameters and simpler stratification.关键词：Eight-link leg configuration;Foot trajectory;Kinematic analysis;Adams
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发布时间：2022-09-25 - 摘要：In order to solve the two structural problems of trapped oil and large flow ripple in gear pump and based on transmission advantages of cycloid gear and its forming principle，tooth number and radius factor of rolling circle which can best reflect pump performance are taken as structural parameters of cycloidal tooth profile，central angle，radius factor and pressure angle of addendum arc functional parameters of gear pump，a cycloid tooth profile with a contact ratio of 1 is constructed in a reverse way and the structural problem of large flow ripple of original single gear pair is solved by the construction of double gear pairs and minimization of ripple coefficient. All results show that the reverse design method of cycloidal tooth profile is simple and accurate，and can be directly used by general engineers； the contact ratio of a single gear pair is 1 to ensure that gear pump has no trapped oil phenomenon； the axial dislocation assembly of double gear pairs with special angle of π divided by tooth number is easy to be realized，and axial comprehensive contact ratio is 2 to ensure transmission stability of cycloidal gear pair； minimum number of teeth is 6 and there is no root cutting phenomenon； compared with single gear pair，an about 75% ripple improvement rate is seen in double gear pair and the optimal tooth profile parameters based on the minimization of ripple factor can be directly applied to the production practice，etc. The aim is to provide a theoretical basis for further research and development of low flow ripple gear pump without trapped oil.关键词：Gear pump;Cycloidal tooth profile;No trapped oil phenomenon;Low flow ripple;Contact ratio;Reverse design
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发布时间：2022-09-25 - 摘要：A metamorphic palletizing robot mechanism with multi degree of freedom （DOF） configuration and single-DOF configuration is designed for repetitive and diverse palletizing. The mechanism is adjusted from multi-DOF configuration to single-DOF configuration，and the movement of any two points in the workspace is realized by single-DOF configuration. Based on this，a method for calculating dimensions of the mechanism is proposed. The mechanism is divided into the essential and supporting branch chains. Firstly，the dimensions of the essential branch chain are optimized according to the workspace，and the dimensional parameters of this branch chain are obtained. Secondly，according to single-DOF configuration，the movement of any two points in the workspace and dimensional ranges of links are set as the constraint conditions. The dimensional parameters of the supporting branch chain are calculated. The reasonable configuration and dimension parameters of the mechanism are obtained through the analysis of the example study. This work provides a reference for the dimensional analysis of metamorphic mechanisms based on practical application.关键词：Metamorphic mechanism;Palletizing application;Mechanism design;Dimensional analysis;Kinematic analysis
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发布时间：2022-09-25 - 摘要：The transmission ratio of NN reducer is discrete and nonlinear, and the gear matching method determines the volume and stability of a reducer. In previous studies， most scholars tried to find out the key parameters affecting the change of transmission ratio or the change rule of transmission ratio. However， the search method is complicated and tooth matching method is single. An improved differential evolution algorithm is proposed to search the transmission ratio. The constraint variables of the teeth in the transmission ratio are analyzed， and the global search of the transmission ratio and the matching method within the specified range is carried out by using the four-fold cyclic logic. An adaptive differential evolution algorithm is improved， and the forced intervention differential evolution algorithm based on the change of the optimal trait is proposed， which adjusts the mutation operator timely based on the change process of the optimal trait in each evolutionary period. Taking the solution of the maximum transmission ratio as an example and based on the global search results， the possibility of using differential evolution algorithm to solve the transmission ratio problem of NN reducer is verified.关键词：NN reducer;Transmission ratio;Global search;Adaptive differential evolution algorithm
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发布时间：2022-09-25
Design· Calculation
- 摘要：Aiming at current problems of low gear shaping efficiency and large cutting force fluctuations in non-circular gears，and based on the gear shaping cutting force modeling and the relationship established between the cutting force and the cutting area，the article proposes circular feed rate optimization method based on constant cutting force constraint. To improve the processing efficiency of the workpiece and reduce the fluctuation of the cutting force，with the machine parameters and the constant cutting area as the constraints，and taking the curvature radius of the pitch curve as the segmented basis，an optimization model of variable circumferential feed is established. Through the analysis of the third-order elliptic gear slotting example，the effectiveness of the variable circle feed optimization model is verified. The segmented optimization avoids frequent and severe changes in the speed of each axis of motion，and realizes the optimization of the processing parameters of non-circular gears.关键词：Non-circular gears;Gear shaper;Constant cutting force;Process optimization
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发布时间：2022-09-25 - 摘要：An age-hardening nitriding gear steel 20CrNi3Mn2Al and its deep case plasma nitriding technology are developed to meet the requirements of large heavy-duty and high-speed gears.The hardness of the material in air-cooled solid solution state is 283~332 HBW， which can ensure good machinability. After the treatment of using 520~540 ℃ variable temperature deep case plasma nitriding process，the steel can obtain high surface hardness，thin compound layer and gentle hardness gradient. The hardness is higher than 900 HV at 0.1 mm below the surface and more than 600 HV at 0.4 mm below the surface； the nitriding depth is deeper than 0.6 mm and the substrate hardness rises to 400~450 HV. It can be used to manufacture gears of heavy load，high speed and high precision， which can partially replace the carburized gears， and therefore leave out the carburizing and oil quenching process， simplify the technology and reduce the gear distortion.关键词：Deep case nitriding hardening;Age-hardening;Nitriding gear steel
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发布时间：2022-09-25 - 摘要：As one of the most basic mechanical parts，a chain wheel plays the role of transmitting power and motion in the chain transmission device. At present，tooth profile of the chain wheel is mostly machined by cutting the forging blank，which comes along with many problems such as large cutting allowance，low material utilization rate，low production efficiency and decreased mechanical properties. A flashless die forging process is proposed to form the tooth profile of the chain wheel. In order to meet the precision requirements of chain wheel tooth profile without cutting machining and considering the influence factors for the forgings size after forged，a precise design method of tooth cavity of the chain-wheel flashless die forging is presented. An experiment of flashless die forging for a chain wheel is carried out by using the die with precise design method of tooth profile cavity established and compared with the conventional design. The results show that the precision design method of chain wheel tooth cavity for flashless die forging has high accuracy，and can directly meet the requirements of chain wheel tooth machining precision. The precise design method of tooth profile cavity size established in this paper can provide reference for other gear forgings.关键词：Chain wheel;Precision die forging;Tooth profile cavity;Precise design method
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发布时间：2022-09-25
Development·Application
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