Cr doped C coatings with different process parameters were prepared on the contact surface of the rolling bearing parts by the closed field unbalanced magnetron sputtering technique.And the performances of the coating bearing,such as speed,vibration,temperature rise,self lubrication and oil-off,were tested.And the effect of different processing parameters on the performance of the coating bearing was compared and analyzed.The results show that,the coating is not suitable for low speed operation of the bearing,the medium-low speed running of the bearing should be chosen for the composite coating of a large carbon element content,and the medium-high speed running of the bearing should be chosen for the composite coating of the large content of chromium element.And that the coating,increased content of chromium element,can improve the temperature rise,the temperature resistance and self lubrication of the composite coating bearing.And the coating bearing has good oil-off performance.

In order to diagnose the fault of axial piston pump and avoid the false alarm caused by the change of load condition,the adaptive fault diagnosis method based on multi characteristic parameters is proposed.Study the method of feature parameters selection,threshold interval determined,load under the condition of adaptive threshold computation,qualitative analysis the type piston pump vibration characteristics and fault mechanism,reveals the plunger pump main fault modes of vibration signal characteristics,experimental results show,threshold adaptive fault diagnosis method can accurately detect the variable load conditions of piston pump port plate wear fault,provide an important theoretical basis for the development of axial piston pump reliability evaluation and fault diagnosis research.

The directed weighted process network of turbine product families is chosen to discover effects of reuse technology on process collaborations.Demonstrations show that the (out,in) strength assortativities of processes possess the approximate negative power law with their corresponding strengths,which reflects the disassortativity of process collaborations.Based on strength disassortativity,the forward and backward strength configurabilities of actual processes and process pairs for turbine product families,as well as the probabilities of technology matching of process collaborations,are analyzed in order to provide statistical experiences of configuration design.

Aiming at the key role for the flow and sharing of knowledge in the New Product Development (NPD) and the trends of NPD mode in the cloud manufacturing environment,analyzed the classification and properties of NPD knowledge in cloud manufacturing environment,and proposed a knowledge management system for NPD in cloud manufacturing,and established the architecture and service operation mode.Then some key technologies was researched,such as the NPD knowledge ontology modeling in cloud manufacturing environment based on Resource Description Framework (RDF),the NPD knowledge semantic querying based on SPARQL Protocol and RDF Query Language (SPARQL),a NPD knowledge management system for automobile and motorcycle parts in cloud manufacturing was given as application.

Motor is an indispensable tool in machining.The various faults often take place in the motor operation.In order to ensure the safe running of the motor,it is particularly important for on-line monitoring of the motor running state.Three-phase asynchronous motor was regarded as the research object.The important parameters of the motor running (vibration,sound,speed and temperature) were obtained by the sensor acquisition.The motor running features were extracted by the time-frequency analysis and energy analysis,and those features constituted feature vectors.The state recognition model was built according to BP neural network training method.The motor running state was evaluated according to BP neural network pattern recognition method.The visualization monitoring system was constructed by using LabVIEW software.The motor running parameters and the states were real-time displayed in the visual interface,and the on-line intelligent monitoring was completed.

The joint optimization of equipment uncertainty degradation and quality fluctuation is studied.Since quality fluctuation is random,Monte Carlo simulation is used to simulate qualified product probability first.Then,constructed equipment degradation and nonconforming rate of quality cost is discussed.According to the maintenance decision’s gain and loss functions,the maximum cumulative prospect theory value as the maintenance time threshold is adopted.At last,the probability and reference point,the penalty value which influence on decision making the scheme are discussed.To compare its effective,compared it with the expected utility theory,the case study shows that the prospect theory can better define the maintenance time threshold.

In order to accurately analyze the advantages and disadvantages of the structure design of heavy-load transfer robot,the rigid-flexible coupling multi-body model of heavy-load transfer robot for performance analysis is built up with ADAMS.The dynamic simulation under typical working conditions of heavy load transportation of heavy-load transfer robot is carried out based on the model,the advantages and disadvantages of different kinds of motor control methods are analyzed,and the vibration displacement of heavy load transfer robot is analyzed.The structure of heavy-load transfer robot is optimized by the analysis results,and the validity of the structure optimization is verified by the dynamic simulation of heavy-load transfer robot’s rigid-flexible coupling model.The applied modeling and analysis method is simple and reliable,which can improve the work efficiency,and has a certain engineering practical value.

Based on the development and industrialization of the robot joint precision planetary gear decelerator,the manufacture processes of precision planetary gear decelerator are optimized which include gear manufacture process,the planet pinion carriers manufacture process,the inner ring gear processing technology,the assembly and the measurement process.The high-speed CNC dry cut hobbing machine,dry cut hob,the broach and slotting tool of the inner ring gear,decelerator efficiency test instrument,fatigue life measurement instrument and other key processing and measurement equipment and cutting tools are designed in the process of industrialization.The new process has been operating stably,its production efficiency has been increased by 13.2% and the rate of defective products has decreased by 6.6% compare with the old process.

In order to improve the efficiency of NC machining and the machining precision of the product,it is studied the industrial robot up and down material technology,automatic sorting technology and the combination application of numerical control machine tool processing technology.According to the processing objects,it is designed the robot automatic feeding mechanism and automatic processing of finished code system.It is also analyzed the interface application technology of FANUC robot and CNC machine tools and the communication technology of MITSUBISHI PLC and FANUC robot and CC-LINK bus.By designing the running track of the robot automatically up and down materials and realizing automatic stacking of the finished products through iRVision system,it made the robot and the numerical control processing as a whole and realized automation and unmanned parts processing process.

A kind of multi robots cooperative system of intelligent assembly is presented,which is composed of ZigBee networks for communication and positioning,RFID equipments,some robot mechanical structures and hardware circuits.The robots moved by guidance of RRSI positioning and tracking,real-time communicated and cooperatively worked including identification,grasp,carry and assembly to the workpiece.The design of system function and hardware structure is described,and the algorithm of wireless location and cooperative assembly is analyzed.The experiment shows that the system accurately and reliably realizes the cooperative assembly,and is applicable to improve the robot′s intelligence and work efficiency.

In order to improve the satisfaction of resources allocation of cloud manufacturing platform designed for manufacturing demand,a mathematical optimization model with the target of eliciting the manufacturing-quality,the manufacturing-cost,the manufacturing-time and the resource-utilization rate was presented based on the analysis of cloud manufacturing platform and related manufacturing resources virtualization and the consideration of the actual manufacturing production processes and manufacturing units.And the reasonable and practical model validated by the genetic algorithm that is sensitive with parameters with different genetic parameters has provide a solution for the problem of manufacturing resources allocation.

Currently,FDM 3D printer has a single print color defects,in order to solve this problem,the study of existing extrusion systems and traditional color standards proposed CMYKW color scheme and examine the standard G-Code commands.Developed a circuit control board,by printing test to verify the CMYKW color scheme and control system effectiveness.To achieve a color 3D printing offers a solution for the further study of color 3D printing technology.

The principle of the binocular laser scanner which has the error and optimization methods is studied firstly and then the cloud data of the ashtray part was scanned and obtained by the optimized REVscan 3D laser scanner.Secondly,the reverse design of the ashtray part was conducted by using of Geomagic Studio and the practical model of ashtray parts was compared with the theoretical model in the Geomagic Qualify.And furtherly,the color difference detection and size calibration of ashtray parts were achieved.The results showed that:the overall tolerance of the ashtray sizes is high by comparing the CAD drawings with calibration dimensions.The method of numerical comparison provides scientific means for controlling product quality,having important practical significance.

Aiming at the disadvantages of large volume,high cost and poor generality of laser engraving machine in the market,a kind of laser engraving machine based on the structure of the Delta robot was designed,the mechanical structure and control system were described,as the research object,the kinematics reverse solution of the mechanical body was solved,the inverse kinematics equation was derived.The accuracy analysis of the prototype shows that the precision meets the requirements of laser processing system.

Through regular testing for the same position in a vertical machining center by ball bar,the data sequence of Y axis backlash value of machining center was obtained.The past and now known or unknown the information of Y axis backlash value is regarded as a grey system.The mathematical model of gray system was established.Time series data of monotonically increasing was generated by accumulating.The albino form of differential equations of grey system GM (1,1) was established.Then the calculation accuracy was improved by correcting of residual model.The corrected model GM (1,1) is used to predict the variation of Y axis backlash values.For the maintenance at late stage of machining center,eliminating backlash provide a basis.

Transmission loss belongs to the anechoic performance of the muffler,acoustic software Sysnoise is used to analyze transmission loss for vehicle exhaust muffler through theoretical modeling,the lack of noise eliminating ability of the muffler in fundamental frequency and high frequency is found,muffler structure is improved through modern theory of muffler design,it was found that the improved muffler effect is obvious through simulation analysis,and at last the double-load method is used to measure transmission loss of the original muffler and a newly developed muffler,and simulation prediction values are in good agreement.

At present,to the question of 3D labeling information displaying structure in UG software,by using UG secondary development tool set UG/Open,through the association of the annotation information with views and layers,and the division of information category,display control of annotation information in 3D model is realized,it is convenient for viewing and understanding 3D model.

In order to explore the law of internal flow and droplet formation in the process of injection,established a two-dimensional axisymmetric finite element model by Gambit,the numerical simulation method based on VOF model and moving-grid technology of Fluent was used to analyze the injection process of the shrink tube type piezoelectric printhead,and to establish the injection system to test the micro droplet injection to study on the formation mechanism of micro-droplet jetting,and to analyze the formation of droplet and attached droplet.The results show that vibration boundary movement caused internal pressure change,which led to the formation of the long liquid zone and micro droplets;the pressure value at the entrance of the inlet affected the production of droplet and attached droplet;available inlet pressure range existed in the specific vibration boundary movement.

High-speed broaching is being attached much importance in the manufacturing process because of the high surface quality of its products.As to the high-pressure and high-flow hydraulic system,the force at beginning and on the end of broaching is abrupt load,which will inevitably result pressure shocks and velocity fluctuations.As a result,dimensional accuracy and surface quality are affected.Based on the analysis of broaching load characteristics,the broaching process of the hydraulic system is simulated by using AMESim software.When high-speed broaching in the condition of abrupt load,the pressure change in the hydraulic cylinder inlet chamber is researched,and the speed and acceleration of main slide carriage are analyzed.Then optimization of the hydraulic system is proposed based on the simulation.The results show that the low-pressure accumulator can effectively reduce system pressure shock at boot;the use of load force feedback PID control,can effectively reduce the pressure impact and speed fluctuation when broaching starts and finishes.

Design history is helpful in product structure design.It studies the representation and reuse of product design knowledge,and presents a case-based knowledge reuse method in structure design of product components.First,according to the research based on the different attributes of similarity calculation in the case retrieval,the hybrid similarity calculation models for crisp and fuzzy attribute type demands are structured.Then,in the study of the weight coefficients,the objective and subjective weights methods are integrated,which overcomes the limitations of a single weighting method.Subsequently,the global similarity was established by combining the hybrid similarity measure and the synthesis weight method.Finally,a case study of the missile is introduced to illustrate the use of the proposed method.The results show that the hybrid similarity and the distribution of weight coefficients could improve the accuracy and reliability of case retrieval.

In order to solve the job-shop scheduling problem in the workshop where tool resources are limited,we first need to analyze the characteristics of the job-shop scheduling problem by considering tool constraints.The constraints of the processing route include machine constraints,tool constraints,and processing time constraints.At the same time non-machine processing and machine processing are also considered.A job-shop production scheduling model that considers tool constraints was proposed,in which the objective was to minimize system make-span.Then in order to obtain the production scheduling scheme which considers the actual production situation of the workshop,the immune genetic algorithm was used to solve the scheduling model,including encoding,selection,crossover,mutation,and decoding.Example analysis results show that not only can it obtain the Gantt chart for workshop production scheduling,but compared with the production scheduling without considering the constraints of tool,it can also satisfy the constraints of tool resources in the workshop.To a certain extent,it can avoid the halting issue from tool use overlap due to limited tool resources.

In order to improve the inner and outer surface contour accuracy of the bearing parts.Design a new semi rigid grinding tool spindle structure,through the analysis and modal test of main spindle system,study on the spindle system frequency and vibration type.The poor rigidity of the contact surface between the rigid abrasive tool and the main shaft is obtained,leading to the swing of the spindle end bending.That provides a theoretical basis and methods for semi-rigid poly urethane grinder spindle optimization design.Finally,using the device for dressing test,the surface roughnesses is better,and validate the feasibility and effectiveness of the proposed method.

In order to studying the principle of cutting force and temperature in micro milling,FEA simulation has implemented to AL6061-T6 and STEEL1018 by AdvantEdge.The minimum chip thickness is preliminary estimated by the analysis of the process of chip formation and different situation of cutting force component,and the size effect in micro machining is also revealed by studying the specific cutting force of two material.The experiment of micro slotting is implemented,the cutting force is measured and the topography of machining surface is analyzed,which give the efficient basis to the optimization of micro machining parameter.

The error evaluation of free surface profile is a difficulty in precision measurement.The unified mathematical model for evaluating surface contour errors is created with the theory of point set topology.On this basis,combining with the characteristics of scroll type line,profile error evaluation algorithm for the scroll plate is established.Carl Zeiss UMC550 is used in the experiment,the data from the UMC550 is applied to the proposed algorithm,the result compares to calculation value of UMC550,and it shows the two results are basically identical.The precision of the proposed algorithm reached the level of the included software algorithm in UMC550,and also the proposed algorithm has higher application value for self-developed measurement software of scroll compressor.

Modular design can facilitate simplifying the manufacturing and assembling of product,reducing the cost of supply chain and improving maintainability.Whereas,green modular design takes disassembly and recycle life cycle factors into account in the product conceptual design,which enhances sustainability of product life cycle.For the deficiency of traditional green comprehensive modularization and constraint-based modularization that can’t support the redesign of product,propose the product redesign methodology for green modularization based on similarity and independence analysis.Firstly,nine environmental attribute indexes between components are established.After that,similarity and independence analysis of module are implemented to identify the components that need to be redesigned.Then,guidelines of green modularization are investigated.The design solutions are evaluated by fuzzy comprehensive evaluation method.In the end,the proposed methodology is illustrated by an example of water fountain.

The dimension of access port of pneumatic refuse collection system was optimized based on response surface analysis.Through the optimization,the weight of access port deduced by 32.2%.And the analysis process shows that there is deviation between the results of multi-objective optimization based on response surface analysis and actual ones.The results should be checked with ones from usual computation method.The relationship between optimization dimension and optimization objective obtained through response surface analysis should be taken into consideration to get the final optimized dimension based on the multi-objective optimization results.In the end,the topology optimization method was used to checked the dimension optimization results,which shows the dimension optimization had reached the optimum results.

Analyzes the adjusting principle and structure of the 3-way flow valve.The 3-way flow valve is used in the quantitative pump load sensing hydraulic system.The analytical model of the damping hole’s characteristic is built and mathematical model of cavity’s dynamic-pressure is established in the process of the 3-way flow valve having a load sensing.Then the main structure parameters of the 3-way flow valve is simulated by Matlab software.Those structure parameters can influence the pressure’s variation.It concludes 4 parameters can affects the 3-way flow valve’s left-pressure in different ways.The damping hole’s diameter,the damping hole’s length,the left cavity,the valve core’s flow-gain of the 3-way flow valve are analyzed.The conclusion that when designing the 3-way flow valve,the damping hole’s size,the left cavity’s structure,the valve core’s shape should be suitable is produced.This work may offer some theoretical basis for the 3-way flow valve’s design which used in the quantitative pump load sensing hydraulic system.

Based on cooperative thought,taking a large die forging hydraulic press as analysis model,the method how to unite several softwares to build dynamic model is introduced detailedly.Firstly,the 3-D model is built in SolidWorks and then transmitted to ADAMS,forming the dynamic model of rigid body.Secondly,the model neutral file of flexible body is generated in Patran/Nastran,then it is introduced into ADAMS and the rigid-flexible coupling model is built,which is used to research the influence of rigid-flexible coupling model on dynamic characteristics.The simulation and experimental results show that the rigid-flexible coupling model can be more accurately analysis the dynamic characteristics of the press.

Aiming at the need of wheel bearing of rail transit vehicle maintenance,design the bearing inner and outer ring rail transit vehicles automatic derusting machine.The derusting machine settings are automatically entry and exit work pieces,workpiece automatic identification mechanism,internal and external circular grinding head,touch screen,PLC electrical control system and pneumatic control system,etc,realized with buses bearing inner and outer ring of automatic polishing and cleaning.