制造技术与机床

Information-physical fusion system of industrial robots based on process simulate

ZHU Wenhua, TAO Han, CAI Bao, GU Hongliang, WANG Jia

2022, (2): 9-13. doi: 10.19287/j.cnki.1005-2402.2022.02.001

[Abstract] FullText HTML PDF(14670KB)

Abstract:
Industrial robots generally suffer from common problems such as long lead times and complicated commissioning when developing new processes. Taking ABB IRB120 industrial robot as the research object, based on Process Simulate industrial simulation platform, adopted the method of physical fusion of industrial robot information, and realized the function of deep fusion of industrial robot solid and virtual model, the synchronized motion function of the two was achieved through data communication, acquisition and transmission, and the time delay error of the virtual model relative to the physical industrial robot was further analyzed. The analysis results show that time delay error of the two is within the industrial allowable range, shows that the technology can provide an effective solution for smart manufacturing, dramatically shorten process development cycles and reduce process development costs, technology is also a concrete engineering application of the digital twin concept and itself has high engineering promotion value.

Mobile robot path planning based on improved grasshopper optimization algorithm

XU Yajie, WANG Haixing

2022, (2): 14-18. doi: 10.19287/j.cnki.1005-2402.2022.02.002

[Abstract] FullText HTML PDF(13500KB)

Abstract:
In order to improve the application effect of grasshopper optimization algorithm (GOA) in mobile robot path planning, improved grasshopper optimization algorithm (IGOA) was proposed by introducing levy flight local search strategy and linear declination parameters random jump strategy. The levy flight local search strategy and linear declination parameters random jump strategy IGOA respectively enhanced the randomness and reduced the probability of falling into the local optimum when compared with GOA. Two different driving environments of mobile robots path planning examples showed that IGOA obtained better results.

Research on flying-shooting method of robot based on KALMAN filtering and deep learning

TIAN Zhibin, XIE Xiaohui

2022, (2): 19-24. doi: 10.19287/j.cnki.1005-2402.2022.02.003

[Abstract] FullText HTML PDF(15611KB)

Abstract:
Aiming at the problem that the traditional robot system for flying- shooting has the separation of vision and control, which leads to the low real-time and poor efficiency of the system, this paper puts forward the scheme of integration of vision and control, and studies the relevant algorithms of flying-shooting. In order to improve the real-time performance of the system, a hard real-time system based on windows is adopted as the operating system. The communication of robot control module and vision module is realized by sharing memory in the same operating system. Based on the improved KALMAN Filtering, a sensorless accurate time trigger algorithm is designed to reduce the positioning error of the robot at the same position when the camera is triggered. The processing speed of image is improved by deep learning, which ensures to complete the calculation of deviation value before the next beat of the robot, and finally the accurate positioning of flying- shooting is realized. The experimental results show that compared with the traditional separate scheme of vision-control system, the robot flying-shooting system for correcting deviation designed in this paper has the advantages of simplicity, precision and efficiency.

Robotic sorting method based on machine vision and improved genetic algorithm

ZHOU Zhixiao, WANG Chen, ZHANG Xiufeng, LIU Chao, TANG Yu, ZHANG Wei

2022, (2): 25-29. doi: 10.19287/j.cnki.1005-2402.2022.02.004

[Abstract] FullText HTML PDF(13686KB)

Abstract:
A robotic sorting method based on machine vision and beetle antennae search algorithm improved genetic algorithm is proposed for the fast-sorting demand of mechanical parts. The sorting method starts with pre-processing of the part image, then extracts the part images using an image recognition algorithm with Sift feature matching and localizes the target parts using affine transformation. Then, a mathematical model is established for the obtained part positions, and the BAS-GA algorithm is used to solve the mathematical model and obtain the grasping path of the robot to achieve fast sorting of the robot. The experiments show that the BAS-GA algorithm achieves a better finding effect compared with the SA algorithm、the GA algorithm and the PSO-ACO algorithm. And compared with the initial path, the optimized path is shortened by 11%, which indicates that the method can effectively improve the robotic sorting speed.

Research of hole quality during drilling of CFRP with ultrasonic-assisted machining

WANG Xu, DING Kai, XU Mingzhou, LIU Sheng

2022, (2): 30-34. doi: 10.19287/j.cnki.1005-2402.2022.02.005

[Abstract] FullText HTML PDF(15065KB)

Abstract:
Carbon fiber reinforced plastics (CFRP) is a woven material, which has the characteristics of anisotropy and high strength. It is difficult to process and has poor processing quality. In view of this situation, the electroplated diamond nesting drill was used to carry out comparative experiments between ultrasonic assisted drilling and conventional drilling on CFRP. Through the analysis of the quality of the entrance and the inner wall, the influence of the ultrasonic vibration on the quality of the entrance and the inner wall of the hole was studied. The results demonstrate that compared to conventional drilling, the glitch and delamination at the entrance of hole were significantly reduced, and the machining defects on the inner wall of hole were also improved.

Research on the robotic polishing based on superhard abrasive tool for aero-engine casing deburring

LI Jian, ZHANG Yun, XIE Zhuoqun

2022, (2): 35-38. doi: 10.19287/j.cnki.1005-2402.2022.02.006

[Abstract] FullText HTML PDF(11338KB)

Abstract:
Casing is an important part of aero-engine, there exist burrs in the edge of casing after machining, which will seriously affect the secondary positioning, assembly and manufacturing accuracy. Aiming at the problems of poor stability and over/under polishing of manual deburring in factories, an automatic deburring method of robot polishing using superhard abrasive elastic tools is proposed in this paper. Firstly, the deburring process system of casing edge is built, and then the selection and teaching programming of superhard abrasive polishing tool are realized. Finally, the optimization experiment of polishing process parameters is carried out and verified on a typical aero-engine rear casing. The results show that the edge filter radius is about 0.1 mm, the transition of adjacent areas is smooth, the processing time is about 3 min, and the polishing tool life is acceptable, which provides a feasible method for automatic deburring of casing.

Experimental research on deep hole drilling of TA15 titanium alloy

FENG Yazhou, HUANG Shuaipeng, LIU Yanshu, DING Yunfei

2022, (2): 39-42. doi: 10.19287/j.cnki.1005-2402.2022.02.007

[Abstract] FullText HTML PDF(11396KB)

Abstract:
Taking the difficult-to-machine material TA15 titanium alloy as the research object, the orthogonal experiment design method is used to study the influence of the chip breaker size, the machine spindle speed and the feed rate on the chip shape during the drilling process. Experiments show that the size of the chip breaker of the drill is the main factor that affects the chip shape, and the spindle speed and feed of the machine tool are secondary factors; the optimized process parameters select the chip breaker arc radius to be 0.8 mm, and the spindle speed to be 255 r/min, when the feed rate is 0.45 mm/r, the cutting process is stable and chip removal is smooth.

Simulation and experimental study on machining of SiCp/Al composites

FAN Yihang, HUO Zhiqian, HAO Zhaopeng

2022, (2): 43-49. doi: 10.19287/j.cnki.1005-2402.2022.02.008

[Abstract] FullText HTML PDF(17851KB)

Abstract:
The SiCp/Al metal matrix composites have excellent properties such as high specific modulus, high specific strength, good wear resistance, high temperature resistance, good thermal conductivity and electrical conductivity, which make it become excellent substitutes for traditional metals in engineering applications. In this paper, our research is about machining SiCp/Al metal matrix composites with 45% volume fraction and establishing machining simulation model with finite element analysis. The machining mechanism was analyzed from the von mises stress distribution, the fracture and crushing mechanism of the particle and crack propagation on chip surface, and verified by milling experiments. The results show that the fracture and crushing of particles mainly occur in the shear zone and the separation surface between the workpiece and the chips. At the same time, micro cracks will occur on the chip surface due to the presence of particles, the propagation of microcracks is an important factor affecting the surface morphology of metal machining chips.

Balance of grinding wheel and its application in grinding engineering

FENG Keming, DU Xiaoxu, WANG Qingwei, ZHANG Liangbo, ZHAO Jinzhui, LV Shenfeng

2022, (2): 50-57. doi: 10.19287/j.cnki.1005-2402.2022.02.009

[Abstract] FullText HTML PDF(22543KB)

Abstract:
In the field of mechanical manufacturing, grinding is usually the last working procedure of mechanical parts because of its irreplaceable advantages. However, vibration often appears in the grinding process, which makes the grinding vibration pattern become the main obstacle to improve the surface quality of parts. Therefore, this paper introduces the unbalance of the revolving body and the grinding wheel, the grinding vibration and the balance precision of the grinding wheel based on the experience of grinding engineering application, the threshold ranges of grinding wheel balance corresponding to different grinding modes are given. The parameters of grinding wheel balance, the factors affecting grinding wheel unbalance and the testing technology of grinding wheel balance are analyzed. The purpose of this paper is to provide some technical support for related technicians to better understand the balance of grinding wheel so as to improve the vibration problem in grinding engineering.

Research on spiral machining method of NC milling circle chamfer

WEI Hongxin, CHENG Fawu

2022, (2): 58-61. doi: 10.19287/j.cnki.1005-2402.2022.02.010

[Abstract] FullText HTML PDF(8177KB)

Abstract:
Aiming at the research of round chamfering in NC machining center, the disadvantages of traditional equal height stratification method are pointed out, and a more effective chamfering surface spiral machining method is proposed. This machining method has the advantages of high surface accuracy and no tool marks, which is very suitable for parts with high chamfering accuracy. It should be pointed out that this paper not only compiles the macro program of outer circle chamfer angle and outer circle fillet, but also takes into account the inner circle chamfer, concave fillet, which reflects the advantages of wide applicability and easy modification of macro programs by manual programming.

Design and parameter optimization simulation analysis of hydraulic variable frequency shaker with rotating structure

SONG Yanfang, TANG Dongya, YANG Yin

2022, (2): 62-66. doi: 10.19287/j.cnki.1005-2402.2022.02.011

[Abstract] FullText HTML PDF(13052KB)

Abstract:
In order to improve the impact stability of the hydraulic impactor, a hydraulic variable frequency shaker with rotating structure was designed, and the control equations of return and stroke motion were given, and the simulation analysis of parameter optimization was carried out by using Simulink platform.The results show that: the piston still keeps accelerating motion when entering the impact stroke stage, but the acceleration decreases gradually.When entering the return movement stage, the piston accelerates with decreasing acceleration first, and then decelerates with increasing acceleration, thus realizing the acceleration return movement of the piston. When the frequency of the shaker is gradually increased, the output amplitude of the system is reduced, and the vibration center is moved upward.When the frequency of the shaker is gradually increased, the system reaches a larger output acceleration, which is opposite to the trend of displacement. When the vibration mass of the hydraulic vibration system is too small, the system can only produce a small excitation force. With the increase of the vibration mass, the excitation force also increases.

Reconstruction of turntable support layout based on flatness error of hydrostatic guide

TONG Zhiwei, HONG Rongjing, SUN Fuzhong

2022, (2): 67-72. doi: 10.19287/j.cnki.1005-2402.2022.02.012

[Abstract] FullText HTML PDF(15057KB)

Abstract:
The bottom support layout of a large liquid hydrostatic turntable has a significant influence on flatness error for a hydrostatic guide. To study how to reduce the flatness error under the condition of turntable subjected to load, the reconstruction method of the bottom support layout on a turntable is proposed, after analyzing the influence of the parameters related to the bottom support layout on the flatness error. Initially, the parametric model of the bottom support layout is established, and then the flatness error under the condition of different bottom support layouts subjected to rated load is analyzed based on the finite element method(FEM). The flatness error value is obtained, and MATLAB curve fitting tool is used to study the influence of the turntable bottom support layout on the hydrostatic guide flatness error. On this basis, the bottom support layout of the turntable is reconstructed. The results show that the load capacity of the hydrostatic turntable improves with the reduction of the flatness error.

Study on surface micro texture processing by ultrasonic rolling

WANG Shijie, DENG Jianxin, MENG Ying, SUN Wei

2022, (2): 73-79. doi: 10.19287/j.cnki.1005-2402.2022.02.013

[Abstract] FullText HTML PDF(19853KB)

Abstract:
In order to study the surface micro texture process of ultrasonic rolling, 45 steel sample is selected as the research object. The effects of process parameters including rolling ball diameter, step length, static pressure and feed speed on texture morphology and depth are analyzed. Single factor experiments are carried out on various surface properties of the textured workpiece. The results show that the ultrasonic rolling process can produce stable texture on the surface, and the diameter and step of the rolling ball have a great influence on the surface morphology. The 8 mm rolling ball with 0.2 mm step can obtain more obvious texture morphology. The increase of static pressure can effectively improve the surface hardness and grain refinement, while the effect of feed rate on surface properties is more complex.

Optimal design of DVT series lathe cross beam based on analytic hierarchy process

JIANG Shufeng, JIA Ruichao, WANG Junfeng, HE Xinlin

2022, (2): 80-85. doi: 10.19287/j.cnki.1005-2402.2022.02.014

[Abstract] FullText HTML PDF(15580KB)

Abstract:
The machine tool cross beam is an important main body bearing structure of the machine tool. The static and dynamic characteristics of the cross beam of the DVT series lathe directly affect the machining accuracy of the lathe and the service life of the consumable parts. Simulation optimization is an effective method if the design cannot be verified by the physical operation of the machine tool parts. In this paper, the working characteristics of the lathe are simulated by means of static analysis and modal analysis of the optimized front beam. The analysis results show that the weak position of the cross beam of the DVT series lathe occurs in the middle of the cross beam, then the relationship between the number and thickness of cross beam ribs and the static and dynamic characteristics of the cross beam is analyzed by analytic hierarchy process and grey correlation method. After the second optimization design is implemented according to the analysis results, the optimal design scheme of the cross beam is finally obtained. The optimization design conclusion shows that it is an optimal design plan when the number of cross beam ribs is 5, the thickness is 10 mm, and the spacing distance between the ribs is 340 mm. After optimization, the cross beam mass is reduced by 117 kg, the stress is reduced by 18%, and the deformation is reduced by 0.01 mm, and the first 3 natural frequencies have been improved to a certain extent, and the optimal design effect is significant. This research method provides a new design idea for the optimal design of machine tools.

Design of ink jet pen cutting control system of NC cutting machine based on MFC + STM32

WANG Ting, LI Huan

2022, (2): 86-89. doi: 10.19287/j.cnki.1005-2402.2022.02.015

[Abstract] FullText HTML PDF(10063KB)

Abstract:
In order to solve the problem that the producers can′t quickly distinguish the products with naked eyes when the CNC cutting machine cuts the products with similar shape and small area, a control system integrating ink-jet, pen drawing and cutting is studied. A set of upper computer control system application program is developed based on MFC, and combined with the lower computer motion control system based on STM32, the product information is finally sprayed and painted on the product, which is convenient for producers to quickly identify the product. The feasibility of the system design is verified by the application of clothing sample, which meets the actual needs of production.

Efficient gear-design methods based directly on pump-performance

WU Weifeng, SU Jiang, ZHANG Enguang

2022, (2): 90-93. doi: 10.19287/j.cnki.1005-2402.2022.02.016

[Abstract] FullText HTML PDF(8610KB)

Abstract:
Focus on an efficient and simple gear-design method for external gear pumps, from no undercut, standardization of addendum coefficient and tip pressure angle, pump-performance parameters was derived, and then from working-condition parameters to pump-performance parameters to tooth-profile parameters to gear-design parameters, a new reverse gear-design method was constructed. All results showed that tooth-number was an leading tooth-profile parameter, the minimum tooth-number was six, and the reverse gear-design method was simple and efficient; contact-ratio was a direct factor affecting flow ripple, the more tooth-number was, the greater contact-ratio was, the better transmission stability and flow ripple quality were, but the worse lightweight effect and trapped-oil effect were, etc.

Research on virtual assembly technology of aircraft engine based on DELMIA

XU Zhanghuan, XU Ying, ZHANG Yue, DAN Yanghui

2022, (2): 94-98. doi: 10.19287/j.cnki.1005-2402.2022.02.017

[Abstract] FullText HTML PDF(13229KB)

Abstract:
Based on the DELMIA digital assembly simulation platform, taking the unit assembly of an aircraft engine as the research object, this paper makes a plan for the assembly process and realizes virtual assembly simulation in the DPM module in view of the onerous and error-prone problems of aircraft engine assembly. Through interference and collision detection, the rationality of assembly process design is verified. Taking the assembly simulation of the actual station between the element bodies of the high-pressure compressor and combustion chamber as an example, this paper analyzes the visual matching degree, limb workspace, and posture fatigue susceptibility of installation workers combined with the ergonomic simulation technology to optimize unreasonable process postures. According to the results, verifying the assembly process by using virtual assembly technology can find and solve the problems existing in the assembly process in advance, improve the assembly efficiency, and reduce the R&D cost.

Research on machining technology and special tooling design of cycloidal eccentric shaft

ZHANG Yifeng, LONG Wenwu, CAO Yidong, GUAN Xiaoqiong

2022, (2): 99-104. doi: 10.19287/j.cnki.1005-2402.2022.02.018

[Abstract] FullText HTML PDF(17702KB)

Abstract:
As a new type reducer, cycloid reducer can be used in gun turret transmission mechanism, industrial robots, CNC machine tools, radar and so on. As the core part of the cycloid reducer, the cycloid eccentric shaft is called "cycloid track generator", which determines the performance of the cycloid reducer, so the machining of the cycloid eccentric shaft becomes one of the key technologies of the cycloid reducer. In order to improve the pass rate of the cycloidal eccentric shaft, the function of the cycloidal eccentric shaft in the phase formation of the cycloidal gear is expounded from the structural form of the cycloidal eccentric shaft, according to the technical requirements of the three-layer eccentric step cycloidal eccentric shaft, the technological process is analyzed, and the precision machining equipment is designed for the forming of the cycloidal eccentric shaft, the key points in the design of special tools are pointed out, and the cycloidal eccentric shaft is machined according to the process cards. The qualified rate of the key dimension of the cycloid eccentric shaft is 100%, which shows the validity of the process and the design of the special tooling.

Research and application of visual management of mold production data

CAI Guoqi, CHEN Mingxing, CHEN Ruizhu, CHEN Yiwei, XIA Qinxiang

2022, (2): 105-110. doi: 10.19287/j.cnki.1005-2402.2022.02.019

[Abstract] FullText HTML PDF(17195KB)

Abstract:
Informatization, visualization, and intelligent management mode have gradually become the development direction of the current manufacturing industry. Aiming at the problems of low efficiency of manual tabulation management and insufficient visualization level in traditional mold manufacturing industry, the demand for visualization management of mold production process is researched. Based on the detailed analysis of the injection mold production process, the production management visualization program is designed, and the core assessment indicators required for the mold production planning stage, production execution stage, and all-set assembly stage are determined. Based on Ajax and Echarts visualization technology, the visualization application of mold production data is realized. Take the injection mold production process of a mold company as an example, through the development of a mold production operation and maintenance management system, it can visually display the implementation of mold production plans, the execution progress of mold processing, and the complete set of molds, so as to realize the visualization of mold production data management and application.

Numerical simulation and experimental verification of electrochemical machining of thin-walled materials with centimeter-scale array structure

HAN Jinzhen, LIU Bin

2022, (2): 111-115. doi: 10.19287/j.cnki.1005-2402.2022.02.020

[Abstract] FullText HTML PDF(14152KB)

Abstract:
In order to promote the engineering application of electrochemical machining(ECM)in centimeter-scale array structure of thin-walled materials, this paper uses the insulation method to explore the 5×5 array hole structure with a single hole diameter of 0.5 cm. Firstly, based on the traditional ECM, a machining plan for the 5×5 array hole structure was designed; on this basis, the flow field and electric field under each machining scheme are simulated; the simulation shows that the cylindrical array cathode is suitable for the machining of the array hole structure, and when the electrolyte pressure is 0.5 MPa, the processing gap is 0.5 cm, and the voltage reaches 25 V, the metal material can be quickly removed; finally, the feasibility of the array cylindrical mask electrode solution is verified through experiments.

Study on the multi-objective optimization method for efficient and high-quality milling parameters

SUN Yingqiang, YANG Qingdong, XU Bo, WANG Ran

2022, (2): 116-120. doi: 10.19287/j.cnki.1005-2402.2022.02.021

[Abstract] FullText HTML PDF(13297KB)

Abstract:
Aiming at the multi-objective optimization problem of milling parameters of CNC machine tools, a multi-objective optimization method for milling parameters of CNC machine tools with high efficiency and quality is proposed. Firstly, a multi-objective optimization scheme with cutting speed, feed per tooth, cutting depth and cutting width as optimization variables and minimum cutting force and maximum material removal rate as objectives is constructed. Then the chaos initialization multi- objective particle swarm optimization model based on tent map is used to optimize the parameters. Finally, the orthogonal experiment with four factors and four levels is established, and the results are compared with the optimized parameters. The experimental results show that the optimization scheme is feasible and the optimization model is reliable.

Optimization of measuring points of planetary gear box based on meemd and correlation analysis

WEI Xiuye, CHENG Haiji, HE Yan, SHI Dazheng, FAN Xingyu

2022, (2): 121-125. doi: 10.19287/j.cnki.1005-2402.2022.02.022

[Abstract] FullText HTML PDF(14405KB)

Abstract:
Planetary gearboxes are highly susceptible to failure as mechanical transmission equipment. In order to reduce the number of sensor arrangements in planetary gearbox fault diagnosis such that reduce the cost, planetary gearbox measurement point optimization method based on the multi-dimensional ensemble empirical mode decomposition (MEEMD) information entropy combined with correlation analysis is proposed. Firstly, the vibration test signals for the five operating conditions are decomposed using MEEMD. Secondly, the correlation coefficients between the decomposed components and the raw data are used to filter out the IMF components containing the main fault information, and their information entropy features are extracted to construct the sample feature vector. Finally, the information entropy eigenvectors of different measurement points of the same operating condition and different operating conditions of the same measurement point are controlled for correlation analysis. The relatively redundant measurement points are analyzed and eliminated to achieve the goal of measurement point optimization.

Ultrasonic testing of residual stress in welding area of the thin-walled metal longitudinal welded pipes

HOU Huaishu, FANG Xinchong, ZHANG Runze, ZHAO Zhifan, YU Xiaodong

2022, (2): 126-130. doi: 10.19287/j.cnki.1005-2402.2022.02.023

[Abstract] FullText HTML PDF(13003KB)

Abstract:
In order to study the residual stress of the welding seam of small diameter thin-walled metal straight seam welded pipes, the critically refracted longitudinal wave method was utilized. The acoustic elastic coefficients of the welded pipes were calibrated by the static load tensile test. The results show that the residual stress increases with the increase of the stretching distance; the residual stress keep rising with the increase of the welded pipe diameter at the same stretching distance; the acoustic elastic coefficients of the welded pipes are independent of the diameter. Combined with the blind hole method, the results show that the critical refracted longitudinal wave is reliable to evaluate the residual stress.

Research on dynamic balance detection and adjustment method of high speed NC rotary table

SUN Hongwei

2022, (2): 131-134. doi: 10.19287/j.cnki.1005-2402.2022.02.024

[Abstract] FullText HTML PDF(3919KB)

Abstract:
This paper analyzes the dynamic balance detection theory of high-speed NC rotary table and expounds the dynamic balance evaluation standard. The selection scheme of dynamic balance detection hardware for high-speed NC turntable is proposed. The adjustment method of dynamic balance of high-speed NC rotary table is described in detail. Combined with an example, the dynamic balance adjustment scheme is verified. Through this research, the vibration caused by dynamic unbalance of high-speed NC rotary table can be reduced, and then the machining accuracy and service life of the machine tool can be improved.

Research on thermal error modeling and generalization of CNC machine tools based on PSO-GPR

ZHANG Lei, HUANG Meifa, CHEN Lin, YANG Ruizhao

2022, (2): 135-139. doi: 10.19287/j.cnki.1005-2402.2022.02.025

[Abstract] FullText HTML PDF(5286KB)

Abstract:
Numerical control machine tool in the process of processing will cause thermal deformation of spindle due to heat. In order to reduce the influence of thermal deformation on the precision of machining parts, a numerical control lathe was taken as the research object. A Gaussian process regression (PSO-GPR) thermal error modeling and prediction method based on particle swarm optimization was proposed. By collecting and measuring the experimental data under five different working conditions, the thermal error model of the axial axis of the main shaft was built, and compared with the unoptimized GPR modeling method. On this basis, the influence of training data enhancement on the generalization of the thermal error model was studied. The experimental results show that the maximum residual error of PSO-GPR model for predicting thermal deformation is 0.49 μm, and the root mean square error (RMSE) is 0.11 μm, which is better than the unoptimized GPR model. The PSO-GPR model with data enhancement reduces the maximum residual in thermal error prediction of verified data by 35% and 33.7% in operating conditions 4 and 5 respectively, indicating that the enhancement of training data can improve the generalization ability of thermal error model.

Effect of thermal error of Y-axis screw on the accuracy of envelope milling

YAO Junhua, HONG Rongjing

2022, (2): 140-144. doi: 10.19287/j.cnki.1005-2402.2022.02.026

[Abstract] FullText HTML PDF(4348KB)

Abstract:
Based on the theory of envelope milling and homogeneous coordinate transformation, an analytical model of the influence of envelope milling gear thermal error on tooth profile error is established. The structure and machining characteristics of the machine tool are analyzed to determine the thermal characteristics of the machine tool lead screw. The thermal deformation of the lead screw is substituted into the machine tool error transfer matrix to obtain the tool helix deviation, and the relationship between the thermal expansion of the lead screw and the tooth profile error is studied. The results show that the axial thermal expansion of the lead screw will cause the deviation of the tool helical surface and the corresponding tooth profile error.

Research and development of rapid design system in reducer shaft

LI Junwen, CHEN Yulian

2022, (2): 145-145. doi: 10.19287/j.cnki.1005-2402.2022.02.027

[Abstract] FullText HTML PDF(5546KB)

Abstract:
Considering the factors of the installation of parts on the reducer shaft, the material and the processing technology of the shaft, the initial structure of the shaft was designed by using the minimum shaft diameter estimation method and shaft shoulder features. Aiming at the judgment of the rationality of the structure, the shaft was checked by using the strength check method. The rapid design of the shaft was developed by using MATLAB GUI module. Six kinds of independent computing blocks were designed in the system. The correctness of the calculation results was verified by comparison with the example results. According to the output calculation result of txt and combining with the parameterized design function of UG, the parameterized three-dimensional model of the shaft wss established. The results indicate that the system has the advantages of simple operation, high calculation efficiency and high precision, and improves the design efficiency of the shaft, and also provides a important reference for the development of other design systems.

Modeling and vibration performance analysis of a ball screw vertical lifting system

HUANG Jin, LU Wenting, CHEN Jiarong, XUE Juntian

2022, (2): 151-158. doi: 10.19287/j.cnki.1005-2402.2022.02.028

[Abstract] FullText HTML PDF(6271KB)

Abstract:
Taking the elevator mechanism of a loading and unloading automatic equipment as the research object, using the Lagrange equation and Ritz series method, the dynamic model of the ball screw vertical lifting system is established in centralized parameter method and distribution parameter method. The dynamic responses of the system are calculated by applying modal superposition principle and the reduced order method for solving differential equations. A corresponding MATLAB calculation program is developed to carry out the numerical analysis. The modal analysis of the system is carried out. The influence of different parameters on the displacement response of the work table are studied. According to the simulation results, the relative weakness of the system is analyzed, and the parameters of screw nut are selected. After the selection design, the mechanism runs more smoothly. The results show that the proposed dynamic modeling method and research results have guiding significance for the vibration characteristics analysis and structural design of the ball screw vertical lifting system.

Study on the dynamic characteristics of motorized spindle with different structures under magnetic pull

YU Hechun, SHI Jinhu, ZHANG Guoqing, ZHANG Suxiang, WANG Wenbo, WANG Renzong, WANG Jin

2022, (2): 159-163. doi: 10.19287/j.cnki.1005-2402.2022.02.029

[Abstract] FullText HTML PDF(4875KB)

Abstract:
In order to study the influence of magnetic pull on the dynamic characteristics of motorized spindle with different structures, according to the mechanical equation of magnetic pull force of the motorized spindle, the finite element analysis model of the motorized spindle is established, two-way coupling calculations of magnetic field and mechanical field is carried out, the dynamic characteristics of the motorized spindle with different motor positions are studied, the dynamic characteristic curve is obtained. At the same time, the motorized spindle is tested to verify the rationality and correctness of the finite element model and the analysis method. Results show that the motor position of the motorized spindle will affect the motion stability of the motorized spindle, and the motor in the middle of the bearing of the spindle will run more stable than the motor at one end of the spindle; under the condition of test error and model simplification error, the total displacement of the axis trajectory calculated by the theory is slightly smaller than the measured value, the rationality and correctness of the finite element model and algorithm are verified preliminarily.

Numerical analysis and research on water cooling system of 170SD30-SY motorized spindle

ZHENG Longyan

2022, (2): 164-168. doi: 10.19287/j.cnki.1005-2402.2022.02.030

[Abstract] FullText HTML PDF(4757KB)

Abstract:
The heating of machine tool spindle is an important reason for the deviation of machining accuracy of CNC machine tool, so the water cooling design of machine tool spindle is very important. Based on computational fluid dynamics software FLUENT, the fluid solid thermal coupling of stator, water jacket and water cooling system of 170SD30-SY spindle is studied by finite volume method. RNG k-ε two equation turbulence model is adopted. The main shaft temperature rise of water cooling system under different process conditions is analyzed, and the design of water inlet and outlet pipes of water cooling system is reasonably optimized on this basis. The results show that the improved water cooling system can reduce the spindle temperature by more than 20 K, which provides a research direction for the development of similar products.

Download CenterMore

LinksMore

2022 No. 2

Journal DynamicsMore

Top ViewMore