Advanced Materials Research Vols. 562-564

Abstract: This paper takes grab type portal crane of a steel branch as the research object, its main girder is the truss structure. The truss girder is optimized with the ANSYS software, through which the size of the structure when the force of the whole truss is minimum can be found. A best plan is determined among many scheme to meet requirements of the design, and the required expenses is the smallest(such as weight, area, volume, stress, expenses, etc)that is the optimal designing scheme is the most effective solutions. The optimal designing method provides reliable reference for designing excellent performance crane.

Abstract: Hoisting machinery is moving forward into high speed and heavy-duty, the requirement of mechanical properties is increasing. Therefore, dynamic research on the main girder crane is necessary. Taking a factory grab type door crane as the research object, the main girder is truss framed. The stress and strain distribution of truss girder in each working conditions to ascertain the dangerous position of the structure is determined with the dynamic analysis of the ANSYS software.

Abstract: Topology optimization method based on variable density and the minimum compliance objective function was used on designing the wheel spokes. SIMP material interpolation model was established to compensate these deficiencies of variable density method. Considering manufacturing process and stress distribution, five bolt wheels was chose to topology optimization. The percentage of material removal of the optimal topology 40% was reasonable. Finite element analysis was used to test the strength and stiffness of the structure of the wheel, the result meets the requirements after wheel topology optimization, and reduces the quality of wheels to 7.76kg, achieve the goals of lightweight design.

Abstract: The basic structure of the piston hydraulic cylinder was introduced. A three-dimensional model was carried out for the hydraulic cylinder by using Pro/E soft，the finite element analysis to the largest hydraulic condition while hydraulic cylinder working by using ANSYS soft，and the distribution of the stress and strain of hydraulic cylinder was derived from it. It optimized the structure of hydraulic cylinder effectively and the cost was saved.

Abstract: End-milling of free-form surfaces on 5-sxis NC tools is a complex problem which has been studied by a large number of research scientists. When end-milling non-convex surfaces, there is a risk of interference between the tool and the surface. This paper presents a new approach to generate gouging-free tool path for constant scallop-height machining using 5-axis toroidal milling. Based on second-order approximations of the machined strip width, we present locally optimal cutting positions for cutting directions. The largest machined strip width of iso-scallop and the corresponding gouging-avoidance tool orientation are calculated. In the cutter path generation procedures, the master cutter paths have been chosen from the minimum curvature loci of the surface. The tool path generated by this method are also compared with that of the long edge of surface as the MCP, the results of simulation show that the method can yield a reduction in line segments of tool path . Velocity curve and acceleration curve are smoother.

Abstract: Based on artificial neural network (ANN), a mechanical properties prediction model for automatic welding is built. The input parameters of the model consist of the chemical elements and the diameter of the welding material and the outputs is the mechanical properties, i.e. yield strength, tensile strength and elongation. The ANNs model is established by Visual C++ based on improved back-propagation (BP) arithmetic with momentum coefficients, in which the sample data used are from automatic welding materials for X70 pipeline steel. The influence of chemical compositions, such as C, S, P, Si, Mn, Cu, Ti and Ni on the mechanical properties of welding materials are analyzed. The results show that the influence of metallic elements is significantly greater than the nonmetallic. For nonmetallic elements, not all the value of mechanical properties decreases with the increase of the content. The influence of C is critical, followed by P and S. For metallic elements, the influence of different elements on mechanical properties, such as the yield strength, the tensile strength, the elongation and the average Charpy impact toughness, is difference.

Abstract: In the vehicle engine's part, piston ring is a important part, which working environment is hard. It’s surface need to be enhanced so that to gain highly wear resistance and anti-corrosion properties. But in the piston ring manufacturing process, how to improve the working environment is a real urgent problem. This article present a design for SCADA(Supervisory Control and Data Acquisition) system using for automatic electroplating line, which use industrial PC , PLC and other components, connected by industrial network. Some detail technology are introduced.

Abstract: Aluminum as solder, in the flat welding process, the temperature field and the residual stress field distribution was the main problem of the study; According to the actual situation of the welding process, using the direct loading temperature method and the indirect loading temperature method , the main path of temperature field distribution curves and the residual stress field distribution were gained by 2D numerical simulation respectively; Through comparison, the indirect loading method can get more accuracy of residual stress field distribution than that of the direct loading temperature method; The above methods were useful in practical production.

Abstract: This paper concentrates on direct rapid prototyping and manufacturing (RP&M) of functional metallic parts. Robotic gas metal arc welding (GMAW) is employed in this “Slicing & Stack” principle RP&M system. It is indicated that surface smoothness is a critical factor to affects the performance of RP & M products. In order to improve surface smoothness of product, the RP & M system must decrease stack error during stacking in each layer. This investigation establishes relationships between welding parameters and weld bead geometry. First, a rational welding parameters range is determined according to preliminary experiments. Then, quadric orthogonal regression rotational combination experiments scheme is proposed to predict width and height of weld bead. The width and height in regression results are expressed in the form of quadratic equations by welding parameters. Significance test results show that the two quadratic equations are both significant. According to the established relationships, users can easily predict width and height of weld bead when welding parameters are given. Whereas when the given condition is weld bead geometry, optimum welding parameters can also be determined by importing boundary condition according to users’ requirement or the service environment of parts. Experiment results indicate that prediction errors of width and height are both less than 3%.

Abstract: The ideal of using air suspension is to reduce the movement friction of measurement system, since of the air suspension structure, the dynamic balance precision of rotating parts for measurement was improved. The use of air suspension measurement system to measure the deviation of the workpiece which rotating around a fixed axis is more efficient and convenient.