New CNC Machining Method for Sculptured Surface Using Non-Ball-End Tools

2012 ◽  
Vol 628 ◽  
pp. 469-475
Author(s):  
Kai Hong Zhou ◽  
Dian Ting Liu
Keyword(s):  
Differential Geometry ◽  
Approximation Theory ◽  
Cnc Machining ◽  
Moving Frame ◽  
Sculptured Surface ◽  
Machining Efficiency ◽  
Manufacture Technology ◽  
Machining Quality ◽  
Tool Surface ◽  
Optimized Model

In current multi-axis CNC manufacture technology, the sculptured surface has to be approximated to simplify its complexity, therefore, the current machining methods can not fully exploit the flexibility of the multi-axis CNC tools and offer the prospect of higher machining efficiency and better machining quality. A new theory (Envelope-Approximation Theory) was presented to generate the sculptured surface by maximizing the machined strip width based on the moving frame. The differential geometry based on the idea of the moving frame was discussed to determine the related motion of the tool and the workpiece. The optimized model of the related motion of the tool was established to enable the envelope of the tool surface approximate to the predesigned surface aiming at the least warping. Simulated examples based on Matlab7.0 demonstrate the improved machining efficiency and precision of the Envelope-Approximation Theory over current published methods.

A Generic, Geometric Approach to Accurate Machining-Error Predictions for 3-Axis CNC Milling of Sculptured Surface Parts: Part I — Modeling and Formulation

2006 ◽  
Author(s):  
Zezhong C. Chen ◽  
Wei Cai
Keyword(s):  
Tool Path ◽  
Cutting Tool ◽  
Geometric Model ◽  
Research Work ◽  
Geometric Approach ◽  
Cnc Machining ◽  
Sculptured Surface ◽  
Machining Error ◽  
Machining Errors ◽  
Tool Surface

In CNC machining, machining errors are usually caused by some of the sources such as cutting tool deflection, cutting tool wear, machine tool vibration, improper coolant/lubrication, and negative thermal effect. To increase product accuracy, much research has been carried out on the prediction of machining errors. However, in milling of sculptured surface parts, due to their curved shapes, the geometries of cutting tools do not match the parts’ surfaces well if the tools cut along the tool paths on the surfaces in a point-to-point way. As a consequence, machining error is inevitable, even if there is no other source of error in ideal machining conditions. To predict machining errors caused by this tool-surface mismatch, several methods have been proposed. Some of them are simple, and some represent the geometry of machined surfaces using cutter-swept surfaces. But none of these methods is accurate and practical. In this research work, a generic, geometric approach to predicting machining errors caused by the tool-surface mismatch is proposed for 3-axis sculptured surface milling. First, a new geometric model of the furrow formed by an APT tool moving between two neighboring cutter contact (CC) points is built. Second, the mathematical formula of cutting circle envelopes is derived. Then an algorithm for calculating machining errors in each tool motion is provided. Finally, this new approach is applied to two practical parts for the accurate machining-error predictions, and these predictions are then compared to the inaccurate predictions made by two established methods to demonstrate the advantages of this approach. This approach can be used in tool path planning for high precision machining of sculptured surface parts.

A Small-Line Segment Dynamic Transition Algorithm Based on Axial Error Tolerance

2016 ◽  
Vol 851 ◽  
pp. 433-438
Author(s):  
Shu Jie Sun ◽  
Hu Lin ◽  
Liao Mo Zheng ◽  
Jin Gang Yu ◽  
Bei Bei Li ◽  
...  
Keyword(s):  
Tool Path ◽  
Maximum Velocity ◽  
Error Tolerance ◽  
Contour Error ◽  
Work Piece ◽  
Machining Accuracy ◽  
Machining Efficiency ◽  
Processing Efficiency ◽  
Dynamic Transition ◽  
Machining Quality

To ensure the machining precision of work piece and improve the machining quality and machining efficiency, a dynamic transition method based on axial machining accuracy is given. Firstly, the maximum machining contour error is computed based on the axial machining accuracy, and the tool path is processed based on the machining contour error to reduce the amount of command points. Secondly, the circle transition method is used to make the tool path smoother and the machining efficiency higher. Finally, the radius of the transition circle is adjusted based on the maximum velocity of each transition circle. The experimental results shows that the method proposed could effectively satisfy the needs of the machining accuracy and improve the processing efficiency, while reduce the amount of path data.

CNC Milling Tool of Choice to Explore

2013 ◽  
Vol 706-708 ◽  
pp. 1246-1249
Author(s):  
Da Lin Zhang ◽  
Ji Lin Guo ◽  
Tian Rui Zhou
Keyword(s):  
Type Structure ◽  
Cnc Machining ◽  
Machining Efficiency ◽  
Processing Quality ◽  
Cnc Milling ◽  
Tool Selection ◽  
Milling Cutter ◽  
Milling Tool

The CNC tool selection is an important factor affecting the CNC machining efficiency and parts processing quality. In this paper, based on the analysis of the CNC milling cutter type, structure, diameter, angle, economy and other factors, a reasonable strategy to select the tool.

Study on the Optimized Cutting Parameters for the Nuclear Channel Head

2011 ◽  
Vol 121-126 ◽  
pp. 3534-3540
Author(s):  
Zhong Hai Yu ◽  
Tian Chen ◽  
Di Shi Liu ◽  
Jing Wang
Keyword(s):  
Mathematical Model ◽  
Nuclear Power ◽  
Large Scale ◽  
Production Efficiency ◽  
Biological Evolution ◽  
Cutting Parameters ◽  
Optimal Combination ◽  
Cnc Machining ◽  
Machining Efficiency ◽  
Complicated Shape

As one of the key components of the nuclear power equipments, the nuclear channel head has a complicated shape and is difficult to be machined. In this paper, the optimal combination of cutting parameters of large-scale nuclear channel head is researched. Considering the machining requirements and machining conditions, the cutting parameters optimized mathematical model is established to achieve the goal of maximum production efficiency. Meanwhile, the target functions and the corresponding constraint functions are analyzed. Finally, by using genetic algorithm of simulating biological evolution, the mathematic models of cutting parameters of CNC machining are compared and optimized. Then the optimized results are compared with the cutting parameters obtained through the trial-producing experience and manual of a small-size channel head. We conclude that the optimized cutting parameters can greatly increase the CNC machining efficiency of Nuclear Channel Head.

MRR Prediction in Micro Channel Grooving Process by Ultra-Fast Pulse Laser

2013 ◽  
Vol 318 ◽  
pp. 350-355
Author(s):  
Gang Chang ◽  
Yi Liu Tu
Keyword(s):  
Pulse Laser ◽  
Integrated Model ◽  
Machining Process ◽  
Machining Efficiency ◽  
Micro Channel ◽  
Design Requirement ◽  
Machining Quality ◽  
Suitable Parameter ◽  
Nano Channel ◽  
Fast Pulse

Ultra-fast pulse laser is a popular tool in the Micro/nano channel fabrication. The final machining result is affected by numerous factors. To fulfill the design requirement and obtain a satisfactory machining quality and accuracy, screening the suitable parameter combination before experiment can save time and cost. This paper uses an integrated model of five prominent engineer parameters in a grooving process to plan the machining process. Additionally, some parameters in the model are adjustable during the machining process, the machining efficiency and fine finish are balanced due to prediction the evolution of the grooving.

Optimal Selecting Strategy for Tool Size of High Efficiency Milling of Complex Curved Surface

2014 ◽  
Vol 496-500 ◽  
pp. 1235-1239
Author(s):  
Hong Liu ◽  
Yong Zhang ◽  
Li Li Luo
Keyword(s):  
Functional Relationship ◽  
High Efficiency ◽  
Effective Area ◽  
Selection Method ◽  
Cnc Machining ◽  
Curved Surface ◽  
Machining Quality ◽  
Large Size ◽  
Combination Selection

It is an important factor that tool size affects the quality and efficiency of complex curved surface of CNC machining. This paper starts with analyzing the functional relationship between the tool size and the quality and efficiency of complex curved surface, gives the selection method of optimal minimum tool which can ensure the precision of machining curved surface, establishes optimal selecting algorithm of reasonable large size tool with the most high efficiency as the objective, and for the curved surface of complex geometric features, puts forward tool combination selection method with effective area ratio of tool machining as a reference. Application examples show: the optimal selecting strategy of tool size in this paper, under the premise of adequately ensuring the machining quality of complex curved surface, can effectively improve the whole machining efficiency.

Efficient NC Tool Path Planning Based on the Subdivision of Sculptured Surface

2014 ◽  
Vol 635-637 ◽  
pp. 497-501
Author(s):  
Li Min ◽  
Biao Bai ◽  
Yu Hou Wu ◽  
De Hong Zhao
Keyword(s):  
Path Planning ◽  
Tool Path ◽  
High Efficiency ◽  
Parametric Method ◽  
Sculptured Surface ◽  
Machining Efficiency ◽  
Tool Path Planning ◽  
Tool Paths ◽  
Surface Subdivision ◽  
Planning Methods

In this paper, we have presented a method to generate efficient NC tool paths based on the surface subdivision. The main objective is to achieve high efficiency in the machining of sculptured surface. The NC machining efficiency can be improved by segmenting the whole surface into distinct areas according to the characters of sculptured surface and by using different size mills and different tool path planning methods to machine the areas. The iso-parametric method and large mills are used in the curvature changing little areas. While the iso-scallop method and small mills are used in curvatures changing large areas. This can make full use of tool path generation methods and mills, which improve the machining efficiency of sculpture effectively.

The Tool Setting Skills of Round Parts in NC Milling

2014 ◽  
Vol 599-601 ◽  
pp. 1283-1286
Author(s):  
Ling Ping Xu ◽  
Ping Wang
Keyword(s):  
Machining Efficiency ◽  
Machining Quality ◽  
Methods And Techniques ◽  
Nc Milling ◽  
Tool Setting

This article focuses on the tool setting methods and techniques of disk parts and hole parts , in order to improve the precision and efficiency of the tool setting, so as to improve NC milling machining quality and machining efficiency of Nc milling.

scholarly journals Study of Combination Algorithm in Partitioning Manufacture Technology

2011 ◽  
Vol 1 ◽  
pp. 150-154
Author(s):  
Hui Feng Wang ◽  
Yong Jun Zhang ◽  
Jing Tao Han ◽  
Ling Chen
Keyword(s):  
Machining Efficiency ◽  
Adjacency Graph ◽  
Manufacture Technology ◽  
Simple Processing ◽  
Feature Based ◽  
Get Complex ◽  
Relationship Of ◽  
The Relationship ◽  
Complex Parts ◽  
Original Feature

Partitioning Manufacture Technology (PMT), which can get complex parts by simple processing has been developed to reduce tooling cost or increase machining efficiency. For the piece number is the primary reason influencing the machining efficiency, to reduce it, a combination algorithm is introduced based on the original feature-based partitioning algorithm. It consists of three steps: (1) Input a pieces set orderly. (2) Built a body attribute adjacency graph (BAAG) to describe the relationship of all pieces in the researching partitioning scheme; (3) Combine the vertices in BAAG, whose combination does not influence the visibility, to reduce the pieces number step by step until there is no redundancy partitioning (RP). At the end of paper, the partitioning schemes with and without combination algorithm are compared. From the comparison we can see introduction of combination algorithm can reduce the pieces number observably. It shows that the improved algorithm can fit to industry better then the former.

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