作者: Quan Hong Liu, Hu Ran Liu

摘要: Sculptured surface are used in a wide variety of applications in the automotive, aerospace and ship building industries, such as turbine blades, impeller and marine propellers. The original design concept is often embodied in a physical model, perhaps sculpted from clay by a skilled artisan, from which measurement data is scanned. Surfaces are fitted to the scanned data, and a mathematically precise description is then available for subsequent steps in the product-design process. Parametric forms such as the well known Bezier, B-spline and NURBS type usually mathematically define the surfaces. Typically, a design is composed of number of parametric surface patches. This is the highly effective method. In this paper an innovative theory for machining complicated surface is presented. By using an anural milling tool instead of ball-end mill or the flat-ended tool, and by adjusting the axis of cutter relative to the surface, the two surfaces, the swept surface and the required surface, have the same curvatures, up to as high as 3rd order. Through the deduction of differential equation, some theory on partial touching between surfaces and surfaces when manufacturing has been explored. The problem of axis orientation under this condition has also been discussed clearly. The outside of the circular tool is a surface; the surface to be machined is a groove, which can be represented by its transverse line. In this case the problem is attributed to the contact between surface and curve.

1376

作者: Xi Jun Liu, Su Xia Zhang, Long Xu Xu, Shu Jun Hou, Bing Huo

摘要: in this paper, super low noise mining system is analyzed with dynamics model, every constructional element is studied with analysis of kinematics and dynamics, the path of the mass center, angular velocity and angular acceleration of every constructional element is obtained. Nonlinear vibration differential equations of the system are obtained according to Alembert principle. Through numerical analysis, the enforced situation and dynamo load torque of the joint between every constructional element is gained, the influence of crank angle on system response is acquired, and the result has a certain reference value to optimization of the system.

1228

作者: Jian Hua Zhang, Da Wei Fu, Xiao Jun Zhang

摘要: Assembly is an important process in the manufacturing processes. For the badly self-adaptive and flexibility, the stuck phenomena and inefficient are often occurred with certain the assembly precision and fit, by using the robot for assembly. In this paper, the kinematics analysis of the three joints robot, which is used to assembly the bearing, is analyzed; the end joint movement angle formula is calculated. The force sensor is used during the assembly process. To ensure the assembly process, a new way is proposed to find the compliant assembly centre, which help the assembly robot to complicate the assemble process. The bearing assembly process is introduced by the three joint robots system.

131

作者: Dai Zheng Fang, Gui Cheng Wang, Xiu Lian Li

摘要: s. The work principle of indexing mechanism with globoidal cam is depicted firstly. Equations of the contour surface and the conjugate contact line are deduced by rotating matrix operators. The value of roughness becomes very small by high speed machining, so it can replace the grinding. At last, kinematics analyze and motion simulation are carried out.

52

摘要: Surface characteristics of the regular polygon contour parts and turning process,including tool movement characteristics,feed speed and feed acceleration, is analyzed with the harmonic analysis principle when cutting the parts. Using MATLAB to draw the displacement, velocity and acceleration variations chart of polygon workpiece turning.

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