Estimation System of Accurate Cutting Time Based on Actual Feedrate Identification

2012 ◽  
Vol 516 ◽  
pp. 113-118
Author(s):  
Kosuke Saito ◽  
Hideki Aoyama ◽  
Noriaki Sano
Keyword(s):  
Machine Tool ◽  
Tool Path ◽  
Estimation Error ◽  
Nc Machine Tool ◽  
Complex Shapes ◽  
Acceleration And Deceleration ◽  
Nc Machine ◽  
Productivity Estimation ◽  
Estimation System ◽  
Cam Systems

The estimation of accurate cutting time before cutting is important for improving productivity. Estimation of cutting time calculated by length of tool path / command feedrate can easily be obtained in commercial CAM systems because NC programs contain machining information, such as tool positions, feedrate, etc. However, the actual cutting time is longer than cutting time calculated by length of tool path / command feedrate due to acceleration and deceleration which occurs along the tool path. In this study, an estimation system of accurate cutting time based on the control system of the machine tool is proposed. Experiments were conducted to cut complex shapes using the NC machine tool to compare the actual cutting time, estimated cutting time of commercial CAM systems and those of the proposed system. The estimation error of the proposed system was only 2 %, while the estimation error of a commercial CAM system was 51 %.

Accurate Estimation of Cutting Time Based on Control Principle of Machine Tool

2016 ◽  
Vol 10 (3) ◽  
pp. 429-437 ◽  
Author(s):  
Kosuke Saito ◽  
◽  
Hideki Aoyama ◽  
Noriaki Sano ◽  
◽  
...  
Keyword(s):  
Machine Tool ◽  
Machine Tools ◽  
Tool Path ◽  
Estimation Error ◽  
Numerical Control ◽  
Accurate Estimation ◽  
Flexible System ◽  
Acceleration And Deceleration ◽  
Nc Machine ◽  
Control Principle

The accurate estimation of cutting time before beginning a cutting process is necessary to improve the productivity of machining. Commercial computer-aided machining (CAM) systems estimate the cutting time by dividing the tool path length by the designated feed rate in a numerical control (NC) program. However, the actual cutting time generally exceeds the estimated cutting time for curved surfaces because of the acceleration and deceleration of the NC machine tool. There are systems that estimate cutting time while considering acceleration and deceleration along the controlled axes, but these are applicable only to particular machine tools. In this study, a flexible system for the accurate estimation of cutting time, based on the control principle of a machine tool, is developed. Experiments to estimate cutting time are conducted for the machining of complex shapes using two different NC machine tools. The actual cutting time is compared with the cutting time estimated by the developed system and that by a commercial CAM system. The estimation error of the proposed system is only 7%, while that of the commercial CAM system is 51%.

Generation of Offset Curves for NC Machine Tool Path

1991 ◽  
Author(s):  
Eisaku Umezaki ◽  
Hiroshi Watanabe
Keyword(s):  
Machine Tool ◽  
Tool Path ◽  
Efficient Tool ◽  
Tool Paths ◽  
Nc Machine Tool ◽  
Circular Arcs ◽  
Straight Line ◽  
Offset Curves ◽  
Nc Machine ◽  
Offset Curve

Abstract This paper proposes a new method which generates offset curves used to obtain NC machine tool paths. A basic idea of the method is to utilize a called offset curve zone where the offset curves of each side constituting the profile of workpieces are generated. Using this method, we can generate the offset curves without being conscious of unnecessary offset curves often appeared in use of other methods and efficient tool paths because there are almost no overlaps of tool paths. For example, this method is applied to workpiece profiles consisted of the segments of straight line and circular arcs to generate the offset curves for tool paths in a two-and-a-half dimensional pocket cutting.

The Solid Modeling and Simulation for Non-Circular Gear Based on Pro/E

2011 ◽  
Vol 230-232 ◽  
pp. 506-511
Author(s):  
Chi Bing Hu ◽  
Ya Zhou Wang ◽  
De Yong Kong ◽  
Yong Ping Liu
Keyword(s):  
Machine Tool ◽  
Modeling And Simulation ◽  
Process Parameters ◽  
Design Theory ◽  
Tool Path ◽  
Automatic Programming ◽  
Post Processing ◽  
Nc Machine Tool ◽  
Nc Machine ◽  
Wire Cutting

Based on the design theory of non-circular gears, using Pro/E drawing module, a system of elliptical gears parametric module and simulation was developed. Machining non-circular gear by wire cutting can be achieved by using Pro / E manufacturing module, and then gear machining tool path is created, tool and process parameters is set and simulation of process tool and process of post-processing analysis was described. Through the above process ultimately to generate post-processing procedures which NC machine tool need and achieve the automatic programming of non-circular gear. Form the application example, it has been observed that the gear created by Pro/E simulated NC programs can correct mesh according to the theory transmission ratio and the effectiveness of the proposed approach.

Error correction technique for numerical control machine tools based on the simplex method

2021 ◽  
pp. 095440542110281
Author(s):  
Hongwei Liu ◽  
Rui Yang ◽  
Pingjiang Wang ◽  
Jihong Chen ◽  
Hua Xiang
Keyword(s):  
Machine Tool ◽  
Error Compensation ◽  
Simplex Method ◽  
Tool Path ◽  
Repeated Measurements ◽  
Numerical Control ◽  
Machining Accuracy ◽  
Correction Technique ◽  
Fluctuation Range ◽  
Nc Machine

The objective of this research is to develop a novel correction mechanism to reduce the fluctuation range of tools in numerical control (NC) machining. Error compensation is an effective method to improve the machining accuracy of a machine tool. If the difference between two adjacent compensation data is too large, the fluctuation range of the tool will increase, which will seriously affect the surface quality of the machined parts in mechanical machining. The methodology used in compensation data processing is a simplex method of linear programming. This method reduces the fluctuation range of the tool and optimizes the tool path. The important aspect of software error compensation is to modify the initial compensation data by using an iterative method, and then the corrected tool path data are converted into actual compensated NC codes by using a postprocessor, which is implemented on the compensation module to ensure a smooth running path of the tool. The generated, calibrated, and amended NC codes were immediately fed to the machine tool controller. This technique was verified by using repeated measurements. The results of the experiments demonstrate efficient compensation and significant improvement in the machining accuracy of the NC machine tool.

Model Research on Special Metal Cutting NC Machine Tool

2007 ◽  
Vol 10-12 ◽  
pp. 806-811
Author(s):  
Tong Zhao ◽  
P.Q. Ye ◽  
H. Zhang ◽  
X.K. Wang
Keyword(s):  
Machine Tool ◽  
Metal Cutting ◽  
Relation Module ◽  
Nc Machine Tool ◽  
Model Research ◽  
Unit Model ◽  
Proposed Model ◽  
Control Research ◽  
Function Unit ◽  
Nc Machine

In this paper the model of special metal cutting NC machine Tool is presented, which consists of a base module, an overall control module, particular functional modules as well as a relation module. Each module involved in aforementioned model will be composed by software, hardware and mechanical parts, so as to combine the convergence of the ideas of modularization and mechanical-electrical integration into current understanding of special NC machine tool through the proposed model. Specially, the relation module is introduced to deal with the linking among all the other modules. The presented model aims to broaden the perspective of machine designers intending to increase the efficiency in machine design. By giving the so-called function unit model a novel modeling approach is delivered to carry out control research of special metal cutting NC machine, which is followed by the formalization description method presented as a possible abstraction methodology towards the efficient description and identification of special metal cutting NC machine tool.

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