Papers by Author: Jiang Han

Abstract: Based on geometry model of single abrasive particle, comparing abrasive geometries of different materials displayed in SEM images, it is proposed that abrasive geometry is similar to inverted cone with vertex radius in sphere. Based on abrasives with inverted cone geometry, through introducing sliding ratio, mathematical models of cutting force and specific grinding energy of single abrasive have been established to study about cutting force in meshing line of single abrasive; in accordance with specific grinding energy of single abrasive, combined with internal meshing principle, the relationship among specific grinding energy, engagement, and meshing line length l have been studied. Through simulation analysis, it is shown that the unit normal force of single abrasive in whole meshing line gradually increases from tooth top to pitch line and tooth root; the greater the value of l from pitch line to tooth top, the more the specific grinding energy accordingly; however the greater the value of l from pitch line to tooth root, the smaller the specific grinding energy therewith; the greater the engagement, the smaller the specific grinding energy which tends to stable with changing of l.

Abstract: A series of experiments was conducted in high speed machining of powder metallurgy material with PCBN tools. The main tool wear mechanisms were discussed by observing tool wear morphology utilizing scanning electron microscopy (SEM) and detecting the element distribution of the worn tool surface using energy dispersive spectroscopy (EDS).The experimental results indicate that fragile breakage occurred before it reached its blunt standard in high-speed machining of powder metallurgy material with PCBN tools,and the tools wear mechanisms are synergistic interaction among mechanical wear,binder wear and chemical wear.

Abstract: Targeted at numerical control machining process of mass customization vehicle wheel rim revolving body parts and its fixture planning problem, using the dot product method between the unit normal vector of the feature facet, it was provide to distinguish the main direction of machining surface, machining position of workpiece was determined, and NC machining process of integrated procedure was designed. The loaded and taken out of the wheel rim workpiece were analyzed according to the two-dimensional plane clamping method, the clamping point position of wheel rim workpiece can be determined. Using the principle of planar mechanism kinematic to analyze one’s claw of turn-mill fixture kinematics trace, so that a quick clamping structure can reduce the cylinder stroke was designed. This fixture device was convenient and reliable.

Abstract: Usually, bigger diameter milling tools were firstly applied in rough machining of NC Milling for improving efficiency and reducing cost before semi-finishing. In order to make the surface of parts more smooth and get accurate dimension parameters and proper shape, it is necessary to select appropriate tools to carry out the finishing of NC Milling. Moreover, higher precision dimension or shapes of parts can be achieve by the method of the semi-finishing, which it can be carried out after rough machining of high efficiency. Currently, the main methods of semi-finishing include semi-finishing of using IPW and semi-finishing of using reference tool.

Abstract: As an industrial control computer,PLC has been widely used in industrial automation area. Through the bus interface module or industrial Ethernet interface module, PLC can communicate with the master PLC, and realize fault intelligent diagnosis. There are all numerous types of PLC, they have respective advantages and disadvantages, and can meet the needs of the user, but in shape, form, function, programming, they are not identical. This paper mainly introduces Mitsubishi PLC, Siemens PLC and OMRON PLC, simultaneously researches their respective communication characteristics and method of fault diagnosis, provide users choosing PLC a theoretical reference basis.

Abstract: To change the phenomenon of "Being an armchair strategist" in current research for resolver, a simulation system of virtual resolvers is researched adopting virtualization. The fundamental principle of resolver and the developing strategy of simulation software are expatiated. Some common problems in the system developed are solved, including the way of real-time updating image, the rotor-rotating method, and the approach of adjusting parameters. In addition, examples of phase discrimination resolvers and amplitude discrimination resolvers are provided separately. This paper provides a worthy auxiliary instrument for resolvers to be researched.

Abstract: Analyzing some main errors of NC spiral bevel gear honing machine-tool, the elements of geometric error, thermal error and force error etc., which are constructed 39 error sources of the machine by stack method. Based on multi-body system theory, using homogeneous transfer matrix(HTM) method to present six feature matrixes that includes ideal-static matrix, ideal-kinematic matrix, ideal-static translation error matrix, ideal-static rotary error matrix, non-ideal rotary motion error matrix and non-ideal translation motion error matrix, which are built between of adjacent body. Finally, the synthetic volumetric error model of six-axis honing machine-tool is established.

Abstract: The application, which the intelligence is used in the fault diagnosis, is the main direction of research currently, especially in the fault diagnosis of large mechanical equipment. In order to improve hydraulic system failure diagnosis of high-speed deep drawing hydraulic press, reduce the efficiency and accuracy of difficulty diagnostic staff. By using rough sets theory combining neural network and the method of large NC hydraulic press, hydraulic system fault diagnosis of diagnosis. This paper established based on rough set - neural network fault diagnosis model, and the following hydraulic cushion hydraulic system as an example, the diagnosis in establishing the fault table based on the rough set theory to fault table attribute reduction and generating rules, will rule input to the BP neural network was trained learning. Get in neural network after the test data repository and simulation. Test results show that the method for the diagnosis of high-speed deep drawing hydraulic press hydraulic system fault is effective.

Abstract: Servo-hydraulic press is a kind of hydraulic press which has feedback device and can detect and feedback signals. Nowadays traditional servo-hydraulic press based on proportion-al servo valve control has been often used,but the study of this article is a new servo-hydraulic press based on the AC servo motor control. In this article, the hydraulic system of new servo-hydraulic press,and the electrical control system including the hardware component and software system have been mainly designed.

Abstract: According to the problem of NC Turning Machine fault diagnosis,this paper use frame as express of fault case,through XML case of storage and retrieval,which can realize the intelligent fault diagnosis reasoning Based on CBR. The redevelopment data stored of the fault cases in the XML neutral document,while XML doucument has the advantage of small data quantity and strong universal make it exchange and transmission easily. provided a new way of data exchange and information integration.