Advanced Materials Research Vols. 945-949

Abstract: The process of using finite element analysis software MSC.Marc to simulate Q345 smooth cylinder tensile sample damage. The result shows that the breaking and crack growth process of materials may be well simulated by using Gurson model and improved damage parameters. The nucleation of internal holes in the material, growth, polymerization and the damage of the material is a very quick process. The material damage process may be accurately simulated by taking the strain of the necking of the tensile sample as the nucleation strain of the holes in the material.

Abstract: The structure of raditional handcuff is of lower reliability. Also, it is difficult to realise the easy-keeping of handcuff keys for different handcuff with different key. In this paper, a new safe handcuff ring is innovative designed adoping transplanation method. The structure of the said new ring is the combination of gear rack with ratchet and magnetic snap.The modeling and analyse of the new handcuff ring is also studied. The new designed safe ring has many distictive advantages that the traditional one do not have, including convinient, reliability, simplicity and beauty.

Abstract: Based on the structure of common scooter, a new portable multifunctional scooter with carrying capacity is developed. Modal analysis of side wheel frame and carrying device on the portable multifunctional scooter is investigated by Solidwoks software. The first five orders natural frequency and major modes of the side wheel frame and carrying device are clarified. The method and the result can be used as a reference of dynamic design and lay foundation for calculation and analysis of dynamic response for the portable multifunctional scooter.

Abstract: Process capability prediction methods for position tolerance under maximum material condition were discussed in this paper. Due to application of maximum material condition the position tolerance specification varied individually for each part, percentage normalization and minimum gap methods were introduced to calculate the position process capability index. Link was taken as an example, true position percentage normalization and minimum gap of 30 parts were calculated. Considering the true position constitution relative to position tolerance at maximum material condition, related individual percentages were used to express the result and the same tolerance size 100% was obtained as for a unilateral tolerance. Set the acceptable value was 0, minimum gap between a hole and a simulated position gauge pin is studied instead of position. The process capability prediction results of two methods were calculated by Minitab software.

Abstract: This paper presents an algorithm for tool path offsetting based on NURBS surface. First the progenitor free surface is fitted with a bi-cubic NURBS surface and the unit normal vectors of the NURBS surface is computed precisely, then the offset surface can be obtained by offsetting the NURBS surface in the normal vector direction with the required distance. Considerable extra computational time can be saved, especially when they are to be offset by several times. As the method successfully computes the unit normal vector of the progenitors, the offset error of this method is zero. The method can also be generalized to other degree NURBS surface, and it can improve the machining accuracy of the surface.

Abstract: Elastic energy that cause coal bump will be stored in coal and rocks when excavating, which has a relationship with time and space. Based on analysis of "7.16 coal bump" accident in Cheng Shan coal mine, 3 impact factors including stability-time, goaf and roof strength were confirmed, then the distribution of energy under different conditions was simulated with Flac3D, the result showed that, 3 mentioned factors all have an impact on energy, and the impact descending order of these factors is: goaf, roof strength and time, while the controlling factor of this accident is goaf.

Abstract: The conveying manipulator is an indispensable transmission system of JM31-160 automatic stamping production line, and structural characteristics of the manipulator directly affect the productivity of auto stamping production line. Using virtual prototyping technology, basing on the Multi-body dynamics theory, explored the technical line of dynamic design theory to apply on the transmission system. Reaching a conclusion the function of optimized structure is improved, and manufacturing cost brings down.

Abstract: In the model-based definition (MBD) scheme, activities of process planning need to be carried out in 3D environment. To realize the 3D computer-aided process planning (3D CAPP), the design solid model needs to be transferred into a representation as manufacturing features, features’ process requirement and product manufacturing information (PMI), and then the generative process planning techniques can be realized by inferring machining operations based machining feature knowledge base. A machining feature-based 3D computer-aided process planning approach is proposed for machining part. Design model is transferred into boundary representation (B-Rep). According to a machining features classification scheme, hybrid machining feature recognition technique is introduced. A part process information model is generated including machining features, feature relationship, feature’s process chain. For each recognized machining feature, a feature’s process chain is inferred from feature knowledge base, based on feature type, process requirements, dimension and tolerances, and the enterprise manufacturing resources. Process intermediate models corresponding to each process operation are generated automatically by applying geometry local modification operations. The complete process plan is generated and documented with detailed operation information and 3D process intermediate models. A 3D CAPP tool is developed on ACIS/HOOPS, with industrial cases to demonstrate the feasibility and applicability of proposed method.

Abstract: Use UG to model and assemble herringbone gear. Through the ANSYS Workbench software, the engaging characteristics of the static state herringbone gear assembly model were confirmed and the analysis was executed to verify the gear design rationality.

Abstract: Kinematics analysis of mechanism refers to analysis for pose、speed and acceleration of mechanism end manipulator. In this paper, the manipulator of MOTOMAN UP50 is firstly regarded as object, then setting up its pose equation by way of D-H, simulating its kinematics by software of Adams, the real time results of pose、speed and acceleration of robot in different conditions have been obtained. Therefore, it makes sense in kinematic performance of joint robot and prepares for further research of kinetic and controlling properties.