Zhao Qian Li

Optimization of Product Assembly Relations Based on Connection Reliability

Enhancing the reliability of product becomes one of the most important ways to perfect its quality. Based on the traditional reliability definition, the definition of assembly connection reliability is presented to describe the connection ability of two assembled parts firstly. Then, the design method based on assembly connection reliability is proposed and a new step-by-step mathematical model for assigning assembly reliability to the parts and sub-systems is established. Based on the model, design scheme oriented assembly reliability is optimized.

Research on the Stress Intensity Factor of the Crack Inclined across the Interface of Cermet Cladding Parts

Basing on the theoretical study on the stress intensity factor (SIF) of the crack inclined across the interface of the cermet cladding part, the finite element analysis (FEA) of the crack’s SIF is made. The change laws of the SIF with the load action angle , the load Q, the clad thickness ratio h1/h, the elastic modulus ratio E1/E2, the inclined angle of the crack β1, and the crack length ratio a1/a2 are obtained. The research results have theoretical and steering significance on the wide application of the cermet cladding part.

Research on the Stress Intensity Factor of the Crack Normal to and Dwelling on the Interface of the Cermet Cladding Part

Basing on the theoretical study on the stress intensity factor (SIF) of the crack normal to and dwelling on the interface of the cermet cladding part, the finite element analysis (FEA) of the crack SIF is made. The change laws of the SIF with the load action angle, the load Q, the clad thickness ratio h1/h and the elastic modulus ratio E1/E2 are obtained. The research results have theoretical and steering significance on the wide application of the cermet cladding part.

Research on the Stress Intensity Factor of the Crack Parallel to and Lying on the Interface of Cermet Cladding Parts

Basing on the theoretical study on the stress intensity factor (SIF) of the crack parallel to and lying on the interface of the cermet cladding part, the finite element analysis (FEA) of the crack’s SIF is made. The change laws of the SIF with the load action angleψ, the load Q, the clad thickness ratio h1/h and the elastic modulus ratio E1/E2 are obtained. The research results have theoretical and steering significance on the wide application of the cermet cladding part.

Thermal Shock Properties of Ternary-Boride-Based Cladding Material

Thermal shock properties of Q235A steel used ternary-boride-based (TBB) cladding material has been studied. The result indicates that this cladding material has excellent resistance to thermal shock and that the cracks are not difficult to occur at the interface of cladding layer and steel substrate. The mechanism of thermal shock failure is fatigue failure brought by cycle stresses. The thermal shock has little influence on the hardness of cladding layer. The structure of cladding layer has no obvious change after the thermal shock, but the phase of steel substrate change from ferrite and pearlite to martensite.

A Trust Fine-Grained Access Control Model for ERP System

In order to protect ERP system information from authorized users or non- trusted users, a trusted role based access control model was proposed. Combined with the characteristics of enterprises, trusted computation for user is designed to support roles assignment to the users. Meanwhile, Object Lifecycle States (OLSs) are presented for efficient access control to objects. Based on the value of trusted computation, users are assigned the corresponding roles to access control various resources. Finally, there is an empirical research on an ERP System implemented in a manufacturing enterprise.

Tolerance Optimal Design System Development and Application Based on UG Quick Stack Module

Computer-aided design tolerances (CADT) technology got far behind the CAD, CAPP, CAM etc, although there are many commercial tolerance software, but the tolerance optimal design still can’t be completed, which seriously affects the CAX technologys integral roles. Based on the tolerance computation function of the UG Quick Stack module, this paper accomplishes the product assembly relation modeling, tolerance distribution, locked circle calculation and so on, achieves the optimal design tolerance of whole product.

Study on Mechanical Properties of Cermet Materials Fabricated from Ternary Boride Cladding on Both Sides Surface of Steel Substrate

Using Mo powder, B-Fe alloy powder and Fe powder as raw materials, with proper forming additives, the slurry was prepared. The green body was formed by spray method on both sides of 16Mn and Q235 steel substrate separately. Both side ternary boride based cermet cladding materials FC-V16Mn and FC-VCuQ235 were fabricated by liquid phase sintering technology. Both materials have high hardness, bending strength and good corrosion resistance.

Framework and Modeling of Networked Manufacturing for Automobile Die

To improve the collaboration efficiency of the networked manufacturing coalition for automobile die enterprise, the networked manufacturing system framework is put forward. Then the information model, resource model and organization structure model are studied one of the other. The information model contains three layers lengthways and the product lifecycle is divided into 5 stages on landscape; for the resource model, the resource is classified and described, the relationship between resource entities is analyzed. The participants of each member enterprise are grouped according to the task relevance in organization structure model, and collaborative discussion center is constructed for the participants to communicate. On the basis, the workflow model is then discussed, the activity in business process is described with UML, then the UML activity diagram is transformed to Petri net graph, thus the workflow model can be diagnosed and analyzed.