Papers by Keyword: Machining Center

Abstract: For the field data of 10 sets of machining center from Shiyan Yixing Industrial Development Co., Ltd. application of statistical methods, the typical domestic machining centers are conducted a comprehensive analysis of reliability. By applying fault frequency and fault proportion primary-and-secondary Diagram, the fault parts and priority are classified and solved.

Abstract: This text passes according to the design of the tool machine reformation spindle, to five axis bridge type compound material machining center motorized spindle design reformation, and design to transfer board, finally success apply to engineering.

Abstract: Since demands for Carbon Fiber Reinforced Plastics (CFRP) are increasing, the number of the studies on machining of CFRP is also increasing. However, since there are already reports on a trimming of a surplus portion or a drilling, we focus on a face machining and a generating the step shape with several cutting tools. Problems in the machining of CFRP include an occurrence of the burr and delamination. Therefore, in this report, we investigate these problems in face milling. And, the machining behavior (Cutting temperature, Cutting force) during the machining is estimated.

Abstract: It is difficult to hand down magic-mirror fabrication technology, which has an extremely small satiny and continuous-curvature corrugated surface, due to downsizing of veteran engineers or even their successors. Therefore, the purpose of this study is to digitalize the magic-mirror fabrication technology using a CNC technology. A mirror finishing method is thus proposed that integrates ball end-milling and magnetic polishing it on the machining center. In addition, the workpiece is end-milled from the rear. Generation of the magic-mirror surface is also carried out.

Abstract: Bamboo grows faster than other renewable natural materials. Bamboo fiber, in particular, has attracted attention as an environmentally superior material. Therefore, we propose a sustainable manufacturing system using bamboo. A method is also proposed for extracting bamboo fibers end-milled using a machining center with in-situ measurement. Bamboo fibers with highly precise shapes are efficiently acquired. Previously, we proposed the fabrication of a binder-free composite by a hot press forming method that only uses bamboo fibers extracted by a machining center. We experimentally demonstrated various hot press forming conditions and achieved proper ones to optimize the forming process. However, we have not yet constructed a method to obtain the best fiber extracting and molding conditions considering both its efficiency and performance. Therefore, in this report, we investigate the influence of the length of used bamboo fiber on the characteristics of the molded products, as its length deeply affects the extracting efficiency and focuses on a degradable plastic as a standard of molded product strength.

Abstract: A method is introduced to process the failure data of 12 sets of machining centers for modelling and analyzing their reliability. In this method, Matlab is applied to fit the failure data for getting a hypothesis that their time between failures obey weibull distribution. Then, MLE (maximum likelihood method) is used to estimate parameters of distribution model of the time between failure, and the K-S test is employed to test the above hypothesis for proving that time between failures of machining center obey weibull distribution. Finally, the analysis of their common failures and corresponding improvements are done, which provide the theoretical basis for improvement of reliability of machining center and are greatly valuable in engineering.

Abstract: connecting rod parts except under larger dynamic load in the institutions, it is also connected with other parts, movement and direction, therefore, the part of the connecting rod connected with other parts on the machining accuracy is crucial. In this paper, analysis and study connecting rod machining process, through the improvement plan, ensure the accuracy of the important parts of the connecting rod parts and the connecting rod production and processing efficiency.

Abstract: Integral impeller is a key part of engine, and its 3D modeling of the blade is difficult in the impeller design, which is also an important factor that affects engine performance. Aimed at improving the poorer quality of blade surface machined by five-axis NC machining center, the smoothing methods in which curves and surfaces are accordingly divided into different pattern and direction are presented on the basis of UG. Smoothing results of the surface modeling and the quality of integral impeller blade in actual machining are increased significantly. The experiment shows that the method is convenient and effective to improve blade surface quality and meet the demand of practical engineering.

Abstract: The design for a double-axis double-rest CNC machining center is introduced by describing its key machine elements and machine tool design procedures. Then based on the theory of the multi-body system, the modeling process of the volumetric error model for the CNC machining center is expatiated and the result of the modeling is given. It is verified that the error of the machine tool is from three line error and three angular errors between structural units as well as the vertical error between axes. Finally experiments are carried out to evaluate the machining performance of this designed machine tool.

Abstract: The detail analysis proposal of the cylinder body is put forward for the automatic tool change mechanism of the QYJ-21 type horizontal machining center. It consists of three main aspects. Firstly, the dimensional model of the cylinders arm bracket portion will be created. Secondly, the topology optimization design of the arm bracket is implemented based on ANSYS Workbench. Finally, meeting the stiffness requirements, the optimal topology shape will be established, for it had the lightest weight.