Application of DNC Communication System Based on Network Manufacturing Technology

2010 ◽  
Vol 40-41 ◽  
pp. 682-685 ◽  
Author(s):  
Jing Chen
Keyword(s):  
Remote Control ◽  
Communication System ◽  
Machine Tools ◽  
Cutting Tools ◽  
Numerical Control ◽  
Data Scheduling ◽  
Central Computer ◽  
Nc Program ◽  
Direct Digital Control ◽  
Configuration Information

DNC is referred to as the Direct Numerical Control, Intended for direct digital control. It means a number of numerical control equipment directly connected to a computer, and the central computer in charge of the NC program’s management and transfer. At present, DNC system includes not only the NC program, but also the manufacturing data of the specific tasks required for the production, such as cutting tools data, scheduling, configuration information of machine tools, and so on, and part of the DNC system also has the functions of machine tool state acquisition and remote control.

Optimization of Control Gains in Numerical Control

2016 ◽  
Vol 1136 ◽  
pp. 651-654
Author(s):  
Hideki Aoyama ◽  
Duo Zhang
Keyword(s):  
Feed Rate ◽  
Machine Tools ◽  
Cutting Tool ◽  
Numerical Control ◽  
Machining Processes ◽  
Nc Program ◽  
Acceleration And Deceleration

It is frequently the case that the feed rate indicated in a numerical control (NC) program does not obtain in actual machining processes and the cutting tool does not path the points indicated in the NC. A reason underlying such problems is that control gains are not optimized, which causes issues with acceleration and deceleration in the control of machine tools. To address these problems, in this paper, we propose a method for the optimization of control gains using the MATLAB and Simulink software by considering the weight of the workpiece, the controlling distance, and the controlling speed. Simulations confirmed the effectiveness of our proposed optimization.

Optimization of 3D Pocket Machining Using Multiple Tools

2012 ◽  
Vol 503-504 ◽  
pp. 7-10
Author(s):  
Ming Rang Yu ◽  
Ying Jie Zhang ◽  
Ding Zhang
Keyword(s):  
Machine Tools ◽  
Cutting Tools ◽  
Numerical Control ◽  
Layer By Layer ◽  
Machining Time ◽  
Pocket Machining ◽  
Numerical Control Machining ◽  
Nc Machine ◽  
Nc Machine Tools ◽  
Scan Line

In numerical control machining, the number and the size of the cutting tools in use have a significant effect on machining efficiency. This paper puts forward a method to select the most appropriate group of cutters for 3D pocket machining using NC machine tools, which aim to minimize the total machining time. Considering the material is removed layer by layer in roughing, three scan-line filling algorithm is proposed to calculate the cutting area of every layer, which is necessary to calculate the machining time. After the total machining time of each group of cutters is calculated, the optimal group of cutters can be determined easily. Both the theoretical analysis and the simulated results show that the proposed algorithm can improve the efficiency of NC machining.

Study on Cutter Radius Compensation Methods for 5-Axis CNC Machining

2009 ◽  
Vol 628-629 ◽  
pp. 347-352 ◽  
Author(s):  
Yuan Liu ◽  
Yong Zhang Wang ◽  
Hong Ya Fu ◽  
Zhen Yu Han
Keyword(s):  
Machine Tools ◽  
Cnc Machining ◽  
Numerical Control ◽  
Cnc Machine Tools ◽  
Cnc Machine ◽  
Nc Program ◽  
Compensation Methods ◽  
Radius Compensation ◽  
Five Axes ◽  
Discrimination Methods

The numerical control (NC) program files need re-generating if there is any tool dimension change or tool wear for multi-axis machining. If the tool is replaced to adapt this change there will be increased cost. To solute this problem, 3D cutter radius compensation method for 5-axis computer numerical control (CNC) machining is deeply researched. Taking five axes linkage machine tools of X, Y, Z, B, C form with rotary tables B and C as an example, coordinate transformation matrix (CTM) and the cutter compensation vector for 3D cutter radius compensation are derived. The discrimination methods for path joint pattern (PJP) are given. A controller with 3D cutter radius compensation function for 5-axis linkage CNC machine tools is developed based on this method. The controller is allocated to a 5-axis milling machine tool and experiments are done. The proposed algorithm is demonstrated using a practical example.

Tool-Path Generation for Conical Groove of Cylindrical Cams by Small-Sized Cutting Tools

2011 ◽  
Vol 189-193 ◽  
pp. 3046-3049
Author(s):  
Jui Pin Hung ◽  
Kuan Lin Chiu ◽  
Yuan Lung Lai
Keyword(s):  
Machine Tools ◽  
Tool Path ◽  
Cutting Tools ◽  
Tool Path Generation ◽  
Path Generation ◽  
End Mill ◽  
Diagram Method ◽  
Tool Paths ◽  
Nc Program ◽  
Generating Method

Instead of 2D expanding diagram method, this paper presents a new regenerating method for cutter location paths of using smaller tools to produce cylindrical cams. According to the expected motions, cams are put to use in various applications in mechanism. For a cylindrical cam, the roller follower operates in a groove cut on the periphery of an end mill with the diameter same as the roller. By using the conventional method, full-sized cutting tools, will restrict the flexibility of choosing cutting tools for wide roller guide. The manufacture of cylindrical cams is complicate and precise work that depends on the generating method and types of machine tools employed. Since the guiding curve cannot be offset exactly along the cylindrical surface, this leads to some approximating problems. Though the tool-paths generation by using the same size tools as rollers is applied in practice, the study of NC program by unequal tools is not available to meet high precision requirement. This proposed 3D offset-based generating method can regenerate tool-paths for standard cutting tools instead of larger ones and implemented on computerized CAM system. Examples with wider grooves are demonstrated to prove its effectiveness.

Research on Online Collision Detection Algorithm of CNC Machine Tools

2016 ◽  
Vol 693 ◽  
pp. 1780-1785
Author(s):  
Zhen Sang ◽  
Tai Yong Wang ◽  
Xiang Xiang Zou ◽  
He Nan Xu
Keyword(s):  
Collision Detection ◽  
Machine Tools ◽  
Detection Efficiency ◽  
Cutting Tools ◽  
Detection Algorithm ◽  
Numerical Control ◽  
Cnc Machine Tools ◽  
Cnc Machine ◽  
Advantages And Disadvantages ◽  
Five Axis

Collision detection is the core of the numerical control system of intelligent manufacturing in the manufacturing process of rapid feeding, positioning and cutting. We need to avoid collision between the cutting tools, machine tools and workpiece. Based on the characteristic of five-axis CNC system, we analyze the advantages and disadvantages of Hierarchical Mesh Segmentation and Octree. At last, we use the collision detection algorithm of cuboid and separation axis to optimize the algorithm of traditional NC machine tool collision detection, which improve the detection efficiency and accuracy.

scholarly journals Research and development of monitoring system and data monitoring system and data acquisition of CNC machine tool in intelligent manufacturing

2020 ◽  
Vol 17 (2) ◽  
pp. 172988141989801
Author(s):  
Yuan Guo ◽  
Yu Sun ◽  
Kai Wu
Keyword(s):  
Machine Tool ◽  
Data Acquisition ◽  
Monitoring System ◽  
Machine Tools ◽  
Intelligent Manufacturing ◽  
Cnc Machining ◽  
Numerical Control ◽  
Cnc Machine Tools ◽  
Cnc Machine ◽  
Nc Program

Intelligent manufacturing as the development direction of the new generation manufacturing system has become a hot research topic. Computer numerical control (CNC) machine tools are the core manufacturing equipment in discrete manufacturing enterprises, collecting and monitoring the data is an important part of intelligent manufacturing workshops. It has a great significance to improve the production efficiency of enterprises and eliminate information islands. The purpose of this article is to solve the problems of data acquisition and monitoring of CNC machine tools in the manufacturing workshop of enterprises. This article uses FOCAS data acquisition method to research and develop the data acquisition and monitoring system of CNC machine tools in intelligent manufacturing workshop. The research results show that the equipment information model based on MTConnect protocol and FOCAS can solve the data acquisition and storage functions of CNC machine tools well. Using the object-oriented Petri net model, it can solve various uncertain factors in numerical control (NC) machining tasks and realize the monitoring function of CNC machining tasks in the workshop. Based on the NC program analysis, the calculation method of machining time in the NC program can determine the preventive maintenance cycle of the machine based on the machine fault information. Based on VS2013 development environment, Qt application framework and SQL Server 2012 database, the numerical control machine tool data acquisition and monitoring prototype system was developed, and the system was verified in the workshop to prove the effectiveness of the system.

scholarly journals Communication methodology between machine tools using MTConnect protocol

2018 ◽  
Vol 175 ◽  
pp. 03066 ◽  
Author(s):  
Wenlei Xiao ◽  
Huiyue Huang ◽  
Gang Zhao
Keyword(s):  
Data Collection ◽  
Control Systems ◽  
Communication System ◽  
Information Exchange ◽  
Machine Tools ◽  
Computer Numerical Control ◽  
Numerical Control ◽  
Smart Manufacturing ◽  
C Language ◽  
Processing Data

Development of smart manufacturing led to a trend of developing autonomous, accessible and cooperative numerical control equipment, which needs a communication subsystem that follows a universal accepted industrial standard. MTConnect has been widely considered as an efficient and sufficient protocol for data collection since its appearance. In this paper, a networked information exchange methodology between computer numerical control systems based on MTConnect technology is proposed, which includes the theoretical architecture of the information exchange module and the implementation of the module based on a CNC systems developed on the TwinCAT platform. A communication system according to the MTConnect protocol for CNC systems was designed, which is able to collect processing data from controllers and transmits those data between controllers by agent and client embedded in the information exchange module. The agent and client which were defined in the protocol were developed through C# language and MTConnect Managed SDK. The proposed methodology was implemented and tested on actual CNC system.

scholarly journals Machine Tool Assignment Realized by Automated NC Program Generation and Machining Time Prediction

2019 ◽  
Vol 13 (5) ◽  
pp. 700-707
Author(s):  
Isamu Nishida ◽  
◽  
Keiichi Shirase
Keyword(s):  
Machine Tool ◽  
Machine Tools ◽  
Input Data ◽  
Numerical Control ◽  
Machining Time ◽  
3D Cad ◽  
Machining Conditions ◽  
Nc Program ◽  
Cad Models ◽  
Case Data

The present study proposed a method to automatically generate a numerical control (NC) program by referring to machining case data for each machine tool with only 3D-CAD models of a product and workpiece as the input data, and to select machine tools for machining the target removal region among several machine tools with different characteristics. The special features of the proposed method are described as follows. The removal volume can be automatically obtained from the total removal volume (TRV), which is extracted from the workpiece and product using a Boolean operation by dividing it on the XY plane. The removal region changed according to the determined machining sequence. The conditions for machining the removal region is automatically determined according to the machining case data, which is stored by linking the geometric properties of the removal region with the machining conditions determined by experienced operators. Furthermore, an NC program is automatically generated based on the machining conditions. The machine tools for machining the target region are selected according to the predicted machining time of each machine tool connected by a network. A case study was conducted to validate the effectiveness of the proposed system. The results confirm that machining can be conducted using only 3D-CAD models as input data. It was suggested that the makespan would be shortened by changing the machining sequence from the optimized machining sequence when machining a plurality of products.

scholarly journals Study of Machining of Gears with Regular and Modified Outline Using CNC Machine Tools

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2913
Author(s):  
Rafał Gołębski ◽  
Piotr Boral
Keyword(s):  
Machine Tools ◽  
Coordinate Measuring Machine ◽  
Optical Microscope ◽  
Numerical Control ◽  
Cnc Machine Tools ◽  
Cnc Milling ◽  
Cnc Machine ◽  
Cylindrical Gears ◽  
Measuring Machine ◽  
Five Axis

Classic methods of machining cylindrical gears, such as hobbing or circumferential chiseling, require the use of expensive special machine tools and dedicated tools, which makes production unprofitable, especially in small and medium series. Today, special attention is paid to the technology of making gears using universal CNC (computer numerical control) machine tools with standard cheap tools. On the basis of the presented mathematical model, a software was developed to generate a code that controls a machine tool for machining cylindrical gears with straight and modified tooth line using the multipass method. Made of steel 16MnCr5, gear wheels with a straight tooth line and with a longitudinally modified convex-convex tooth line were machined on a five-axis CNC milling machine DMG MORI CMX50U, using solid carbide milling cutters (cylindrical and ball end) for processing. The manufactured gears were inspected on a ZEISS coordinate measuring machine, using the software Gear Pro Involute. The conformity of the outline, the tooth line, and the gear pitch were assessed. The side surfaces of the teeth after machining according to the planned strategy were also assessed; the tests were carried out using the optical microscope Alicona Infinite Focus G5 and the contact profilographometer Taylor Hobson, Talysurf 120. The presented method is able to provide a very good quality of machined gears in relation to competing methods. The great advantage of this method is the use of a tool that is not geometrically related to the shape of the machined gear profile, which allows the production of cylindrical gears with a tooth and profile line other than the standard.

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