Papers by Keyword: CAM

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Authors: Jian Ping Liu, Bang Yan Ye, Jian Xi Peng
Abstract: For inverse constructing object from its orthographic image, a new method of 3D reconstruction based on image vectorization and bi-arc approximation of cubic B-spline is investigated. A 3D CAD model is automatically acquired from 2D views by means of 2D primitive recognition, 3D reconstruction of primitive and combination of 3D primitive bodies. With the help of CimatronE8.0 software, reasonable procedure design and optimization toolpath planning are applied to increase machining accuracy and productivity during automatic programming for reconstructed 3D solid. Reconstructed parts are machined on the VMC-600 type machine center with FANUC system. The results of application indicate that this method has many advantages, such as quickly obtaining the CAD model of part, getting smooth machined surface, efficient machining without invalid or reduplicate feed and so on. As a result, it can be applied widely in NC machining field.
619
Authors: Ryo Nishiyama, Keiichi Nakamoto, Tohru Ishida, Yoshimi Takeuchi
Abstract: This study deals with 5-axis control tool path generation to create microshapes dexterously and efficiently, while maintaining quality. Concerning 5-axis control machining, the use of ball end mills is generally employed. However, this method needs a lot of time to obtain high quality surface. To solve this problem, a side cutting edge of the ball end mill is positively utilized with its parallel to the ruled surface. Therefore, a new CAM system is developed to detect the surface to be machined with the side cutting edge, and to generate collision-free tool paths between the tool and the work piece. The effectiveness of the developed CAM system is experimentally confirmed by creating a tiny Möbius ring.
176
Authors: Guo Chang Qiao, Deng Bin Qiao
Abstract: This design is an implementation method based on the "automatic obstacle avoidance car", which gravitational potential energy can be converted into mechanical energy and driving as the motivation .This car can automatically avoid obstacles on the track settings in advance. The greatest feature of the car is during its operation, accelerating first then maintaining a constant speed, so that less energy consumption are required. Besides that, the walking track is closing to the sinusoidal curve. The convenient manufacture has a simple structure as well as high transmit efficiency.
1094
Authors: M. Al’Hapis, A. Razak, Ahmad Zakaria
Abstract: This paper describes a research work to explore the utilization of macros in an effort to improve an overall machining efficiency. Latest models of CNC machine are equipped with many functions and resulting difficulty in creating NC program. Feature based machining is optimizing the capabilities of CNC machine. A novel framework of a feature based machining system using macros is discussed in this paper by applying some normally used features and work material in manufacturing industry. Experiments has been conducted in proving its functionality. This system found enable to reduce pre-machining setup time and easy to used. Lastly, a graphical user interface is proposed.
1711
Authors: Fu Yuan Li, Jun Wang
Abstract: As a base of optimization of metal cutting, a new method of solution of optimization for single pass turning is proposed in this paper. There are three parts for this new method. Firstly, the optimal point must exist on the boundary of the feasible domain of the cutting conditions. Secondly, it is easy to add the processing of determining the boundary of feasible domain as new constraints. Thirdly, the local optimal point on every piece of line or curve of the boundary can be calculated, and finally the minimum of those local optimal points is the final optimal point. There are no local optimal points on the curves of constraints Tmin and Tmax except the intersection points. In addition, the trend of the objective function is affected by the rate . It is helpful to calculate the optimal point by computer. This approach provides a basic research on the affection of the statistics characteristic of the empirical functions used in this case.
149
Authors: Divya Singh, Richa Pandey
Abstract: A prosthetic replaces any missing human body part visibly and also aims to resume the normal functionality of the part. Reverse engineering extracts information from a present model or available design and develops a new model using advanced CAD tools. Nowadays the reverse engineered part can be combined with rapid prototyping by various software and integration of CAD-CAM platforms. In this paper, a new method to reverse engineer the residual limb information for lower limb amputees, in order to use it for analyzing and developing a prosthetic socket by scanning and developing a CAD model is proposed. Along this are discussed, the advantages and challenges. This work falls in the emerging field of interdisciplinary engineering, combining medical and advanced mechanical engineering on a humanitarian platform
558
Authors: Quan Liang, Yong Zhang Wang
Abstract: In order to improve the efficiency of integrated impeller rough machining and make up the deficiency of commercial computer aided manufacturing (CAM) software in five-axis plunge milling, a ruled surface impeller plunge milling method was presented. Boundary vectors were generated according to an impeller’s ruled surface blade. Quaternion interpolation algorithm was used to interpolate cutter axes according to these boundary vectors. The computing formula of row spacing and stepover are deduced to ensure high material removal rate and machining efficiency. Hub surface and a blade finishing cutting path were also generated. Based on the algorithm, an integrated special impeller plunge milling CAM software was independently developed. The generated cutting path was simulated and also carried out practically. Simulation and experimental results show that this method improves the efficiency of impeller parts rough machining to a certain extent.
53
Authors: Liu Han, Ping He
Abstract: A rapid cam design and manufacturing simulation system is developed. The system consists of some modules which can be easily extended or updated. In the design module, the profile of disc cam is generated by defining some parameters – rise allowable pressure angle, return allowable pressure angle, the radius of curvature of cam profile etc. And the kinematics analysis of cam is also calculated in this module. Then the profile is transferred into Catia for generating a three dimensional geometry of the cam, and NC program is generated. Last, the NC program is verified by Yulong NC simulation system.
185
Authors: Nurul Wahieda Muhamad Bustaman, Mohd Salman Abu Mansor
Abstract: Throughout the production process, improper planning and exploitation of the CAD/CAM system leads to the low level utilization of the CNC milling machine. In product design, tangible prototype is fabricated using CAD/CAM techniques in the design phase to analyse and modify the product before actual production. In this research, industrial clay is used as the prototype material. The objectives of the study are to investigate the machining parameters of industrial clay using the CNC milling machine and to apply the CAD/CAM system in producing a clay sample part via the CNC milling machine. Using uncomplicated and low cost setup for the fabrication method, an industrial clay sample part is prepared in the CAD/CAM system and shaped using the CNC milling machine. The difference between the simulated and the actual machining time of the machined part is analysed.
32
Authors: P.S. Pa, J.B. Jou
Abstract: This study presents a brand new concept in contrast to that of the conventional mechanical toy robots on the market. Conventional toy robots rely mainly on a large sole area to reduce wobble during walking. In this study walking stability is realized not by large sole areas but by a cam designed to automatically shift the center of gravity during walking. The biped toy robot proposed is driven by a single motor. As soon as the robot takes a forwards step, the center of gravity is changed by the cam module, and under the action of gravity, the trunk moves automatically to shift the center of gravity. Both walking and shifting the center of gravity is done by one motor. It was a goal of this study to develop a new type of walking toy robot by modifying traditional toy design. Experiment and simulation revealed that the rotation speed of the crank influences the walking of the biped toy robot, and the crank length influences both the length and height of the stride. In addition, counterbalance of the robot while walking is affected by the location of the center of gravity of the trunk and the distance between the feet. It became clear that the stability of the walking robot was determined by many factors, and difficulties may arise if any of these factors is changed.
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