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5-axis CNC machining is one kind not only may realize the ordinary machining, but may also complete from the rough cutting to the post processing entire flow new cutting way. This article develops special software to plan cutting path for ruled surface impellers. By fitting sampling data points of an impeller blade into a curve, a model of ruled surface blade of an impeller is built up. Furthermore,...
A new high-speed milling scheme for machining complex revolutionary spiral curved surfaces by using the whirlwind milling technique is presented. The fundamental relationship equations of this milling technique are discussed based on 5-axis CNC specialized rotary-table horizontal milling machines. And the main parameters in generating tool paths are analyzed carefully. With this new method, a wider...
Pipe Cutting machine has been widely used in ocean engineering, pipeline engineering, etc. According to the application of pipe cutting machine in the construction of offshore platform, a novel open architecture CNC system based on Industrial Personal Computer (IPC) and Digital motion controller (DMC) applied in a 6-axis flame Pipe Cutting machine is designed. Software system with multifunction and...
Soccer robot control system is a closed-loop control system which consists of four components: visual subsystem, decision-making subsystem, wireless communication subsystem and robot vehicle subsystem. The system real-timely monitor the position and movement of the robost as well as the dynamic change of the environment, then make decision and set out instructions to drive the robots running to the...
Cutter radius compensation is the key technology in CNC system and is the data sources and basis of contour interpolation. It is the necessary premise to guarantee the part contour according to programming track and cutter radius to plan the tool center path, especially the coordinates of the joint points. The concept of orientation vector is introduced and a technology of 3D cutter radius compensation...
In this paper, the technology of the artificial neural network (ANN) is applied in the study on cutting force prediction of supercritical material milling. Base on the orthogonal milling experiments, three signals of the cutting force have been collected. The basis of this approach is to train and test the cutting force model. The inputs to the model consist of cutting velocity vc, feed rate fz and...
The development trend of gear hobbing machine which includes CNC, high-speed, high-accuracy, direct-drive and environment protection, is discussed firstly, and design principle of direct-drive gear hobbing machine of dry-cutting, which break through traditional structure design theory of gear cutting machine, is put forward. Direct-drive gear hobbing machine adopts the technologies of build-in motor...
In order to reduce the use of cutting fluid and the environmental hazard, this paper presents the investigation of the machinability of ball-end milling process with the dry cutting and the mist cutting for carbon steel on 5-axis CNC machining center. The relations of the surface roughness, the flank wear, and the cutting parameters, which are the spindle speed, the feed rate, and the depth of cut,...
An adaptive control method of feedrate for free-form surface parts in NC machining is studied in this thesis. Free-form surface is simplified according to the neighborhood form of one point on surface. Machining model is established and tested in special cutting conditions. The optimum feedrate of simplified model is gathered. The free-form surface is matched to the simplified model by using matching...
Recent developments in cutting tool materials of CNC maching have brought many exciting changes in the field of metal cutting . Machine operators can benefit from wider selection of insert grade in cutting process. On the other hand, selecting the optium insert grade from its increasing number of existing alternatives in workshop is multiple-criteria decision making (MCDM) problem in the presence...
Considering the deficiency in cutting conditions optimization of milling process, based on the dynamic modeling of milling process, a dynamic simulation software of complex cutting conditions milling process was developed successfully in Matlab-VB.net hybrid environment. On the basis of measurement of machining system's dynamics and corresponding experimental modal analysis results, the simulation...
A simple method to create the toolpaths from bitmap picture of the workpiece for NC machine is described in this article. Halftone process is used to reproduce a continuous tone picture to binary tone picture for making a prototype picture. The obtained two dimensions picture with halftone process is employed to create the toolpaths of the sample workpiece. The workpiece dimension can be scaled to...
Arming at the characteristic of shrapnel multi-type and variable batch, developing tools Visual C++ 6.0 and Pro/Toolkit are used, the CNC system based on SmarTeam Data Model is put forward. Effective management and utilization are carried out which are in the fields of the processing parameter inquiring, experience inquiring and G code of numerical control cutting, milling, drilling, boring and so...
In envelope process of cutter, profile and tool-path of cutter are complicated, and the grinding depth is variable which causes grinding force to change on a large scale and the error of edge envelope to increase. To improve cutter accuracy, the theoretical model of cutter edge and theoretical tool-path of CNC tool grinder were calculated. Closed-loop control system was designed to accomplish control...
Generally, free-form surfaces are machined using the following procedures: by a CAM postprocessor a free-form surface is approximated into a number of smaller straight lines or curves to send a CNC system in the form of G/M code, which focuses on the constant speed of cutter location point instead of the constant speed of cutter contact point. These methods lead to low machining efficiency and accuracy...
In the machining, process parameters need to be monitored and adjusted automatically, which can improve production quality and reduce machining time. At present, it is mainly concentrated on the study of some algorithms about tool wearing and tool breakage, or theory modeling of interrelated models in the processing machining. The monitoring systems independent of CNC are also investigated to realize...
In this paper, a new method for optimization of cutting paths is proposed. In which the cutting forces and chatters concerned in the machining process are taken into account. The main objective of this work is to get a smooth variation in cutting resistance for the area where there is a sudden rise or decrease of cutting forces to avoid chatter vibration. Unlike the previously methods, the conventional...
To improve production rates and the economic benefits, process parameters need to be monitored and adjusted automatically in the machining. At present, it is mainly concentrated on the study of the algorithms about tool wearing and tool breakage, and theory modeling of interrelated models in the processing machining. The monitoring systems independent of CNC are also investigated to realize the status...
A parametric surface directly interpolation method with a flat-end cutter has been presented in this paper. Distance between two adjacent CC paths has been calculated to facilitate the calculation of the increment of parameter. A CC path is interpolated to get a CC point, which is then transferred to CL data. Through adding post-process to the CNC system, the CL data is transformed into the control...
In this paper, a new method is proposed to detect clean-up regions and generate pencil-cut tool paths for machining complex polyhedron. The pencil-cutting is to remove the uncut volumes left at the regions that a larger cutter cannot machine during finishing process. In this paper, the surface is discrete by a series of quadrilateral grids. The method is used to gain the normal vector and the angle...
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