Strategy and Application of Modeling and NC Machining for Rotary Parts of Complex Curved Surface

2012 ◽  
Vol 184-185 ◽  
pp. 477-481
Author(s):  
Wei Hong Liu ◽  
Hai Bo Liu
Keyword(s):  
Ball Mill ◽  
Nc Machining ◽  
Curved Surface ◽  
Production Cycle ◽  
Milling Machine ◽  
End Mill ◽  
Rough Machining ◽  
Operation Rate ◽  
Nc Milling ◽  
Rotary Parts

Aimed at the difficulty of rotary parts of complex curved surface in modeling and NC machining, making full use of advanced modern molding technology of Solidworks and powerful NC machining skill of Mastercam, the paper introduced a strategy , segmented milling that a true part was step to step machined by end mill not ball mill on 3 Axes NC milling machine but 4 Axes during rough machining. According to the method, it can raise the operation rate and shorten production cycle.

On Programming for NC Grinding of Grooved Cam with Discretional Plane Curve Profile

2007 ◽  
Vol 359-360 ◽  
pp. 554-558 ◽  
Author(s):  
Zi Qiang Zhang ◽  
Yong Chao Ge ◽  
Zhi Dan Zheng ◽  
Shao Bo Chen
Keyword(s):  
Plane Curve ◽  
Nc Machining ◽  
Milling Machine ◽  
Circular Arc ◽  
Curve Part ◽  
Circular Arcs ◽  
Validation Experiment ◽  
Nc Milling ◽  
Curve Profile ◽  
Nc Grinding

In grinding of grooved cam, the programming for NC machining can’t directly be accomplished according to track curve of roller center in working drawing because the diameter of wheel becomes smaller than diameter of cam’s follower roller after wheel dressing. Track curves of wheel center are equidistant curves of the track curve of roller center and they can be gained by equidistant offset. But track curves of wheel center can’t be gained by equidistant offset for grooved cam with discretional plane curve profile, due to the profile including aspheric curves whose equations are usually unknown. To solve above problem, circular arc approximation for the aspheric curve part was realized by using Approximate Double Circular Arc Interpolated Method (ADCAIM), then equidistant offset of circular arcs was carried out by “offset” way, and consequently track curves designed for wheel center of any diameter can expediently be gained on AutoCAD platform. Validation experiment of simulation grinding was fulfilled on a NC milling machine. The experiment results indicate: it is feasible to NC grind grooved cam with discretional plane curve profile using the method introduced in this paper for the example.

Basic Research on Five-Axis NC Machining of Subdivision Surface

2010 ◽  
Vol 139-141 ◽  
pp. 1237-1240
Author(s):  
Hong Yuan ◽  
Xiao Li Lu ◽  
Rong Jing Hong
Keyword(s):  
Tool Path ◽  
Basic Research ◽  
Nc Machining ◽  
Normal Vector ◽  
Subdivision Surface ◽  
End Mill ◽  
Rough Machining ◽  
Position And Orientation ◽  
Tool Position ◽  
Five Axis

Basic research on five-axis NC machining of subdivision surface is presented. Research on Catmull-Clark subdivision surface, a method is presented by using computational geometry techniques to determine optimal tool position and orientation for 5-axis machining with torus end-mill: The normal vector of the subdivision surface vertex and the offset surface calculation are discussed firstly, then the rough machining model of subdivision surface is built and machined by using five-axis machining with the motion of the torus end-mill position and orientation according to the normal line of the surface. The tool position and orientation, cutting radius and tool path are calculated. Finally a computer simulation instantiation is given. This method improves the machining ability of subdivision surfaces.

Application of Accuracy Engraving Technique in the Complex Curved Surface Mould Processing

2012 ◽  
Vol 605-607 ◽  
pp. 133-136
Author(s):  
Xin Liu ◽  
Wei Fan
Keyword(s):  
New Product Development ◽  
Design Method ◽  
New Product ◽  
Curved Surface ◽  
Rapid Manufacturing ◽  
Milling Machine ◽  
Traditional Design ◽  
Nc Milling ◽  
The Cost ◽  
Plastic Mould

The advantages of the precise carving techniques in complex curved surface mould processing are studied. The small tools of carved machine can realize the small size processing which is unachievable for CNC and NC milling machine. The method using accuracy engraving machine to manufacture complex curved surface mould with small features is proposed, so the speed of mould processing is accelerated, the cost of new product development is decreased, the rapid manufacturing is realized and the traditional design method using only CNC and milling machine is improved. Finally, this method has been applied to the processing of a plastic mould and the application method is expounded.

Studies on NC Machining for Cylindrical Cams

2005 ◽  
Vol 291-292 ◽  
pp. 489-494
Author(s):  
Wei Qiang Gao ◽  
Qiu Sheng Yan ◽  
J. Liang ◽  
Z.Y. Liu
Keyword(s):  
High Speed ◽  
Cutting Tool ◽  
High Reliability ◽  
Low Cost ◽  
Nc Machining ◽  
Kinematics And Dynamics ◽  
Milling Machine ◽  
Method Of Calculation ◽  
Spatial Mechanisms ◽  
Nc Milling

Cylindrical cam mechanisms have many merits, such as compact configuration, low cost, high reliability, better performance of kinematics and dynamics, and they have been widely used in fields of automatization and mechanization. Cylindrical cam mechanisms are the spatial mechanisms. Traditional methods of design and machining for cylindrical cam were complex, and it was difficult to ensure the precision of machining cylindrical cams, so it is impossible to meet the requirement of the development of high-speed automatic equipments. The better method of machining for cylindrical cams is to use the NC milling machine with 3 moving coordinates and 1 revolving coordinate. The key to realize the machining method is to resolve the problem of calculating tool’s paths for NC machining from the motion rule of followers of cam mechanisms. In this paper, the programming principle and technology of NC machining for cylindrical cams were analyzed, the compensation of cutting-tool radius for NC machining was discussed, the method of calculation for motion rule of cam followers and method of programming of NC machining with 4-coordinates were proposed, through which perfect effect have been gained in practice.

Interference-Free Multi-Axis NC Machining of Cylindrical Cam Using Enveloping Element

2009 ◽  
Vol 419-420 ◽  
pp. 333-336
Author(s):  
Jeng Nan Lee ◽  
Chih Wen Luo ◽  
Hung Shyong Chen
Keyword(s):  
Cutting Tool ◽  
Nc Machining ◽  
Model Material ◽  
Solid Model ◽  
End Mill ◽  
Generating Method ◽  
Collision Problem ◽  
Five Axis ◽  
Cutting Path ◽  
Cutting Simulations

To obtain the flexibility of choice of cutting tool and to compensate the wear of the cutting tool, this paper presents an interference-free toolpath generating method for multi-axis machining of a cylindrical cam. The notion of the proposed method is that the cutting tool is confined within the meshing element and the motion of the cutting tool follows the meshing element so that collision problem can be avoided. Based on the envelope theory, homogeneous coordinate transformation and differential geometry, the cutter location for multi-axis NC machining using cylindrical-end mill is derived and the cutting path sequences with the minimum lead in and lead out are planned. The cutting simulations with solid model are performed to verify the proposed toolpath generation method. It is also verified through the trial cut with model material on a five-axis machine tool.

3D-to-2D Mapping of Cutter Paths in NC Programming of Complex Engineering Parts

1993 ◽  
Author(s):  
Chao-Hwa Chang
Keyword(s):  
Three Dimensional ◽  
Machining Process ◽  
Milling Machine ◽  
Systematic Method ◽  
Nc Programming ◽  
Cutter Path ◽  
Nc Milling ◽  
Complex Engineering ◽  
High Level ◽  
Mapping Concept

Abstract The concept of mapping a three dimensional (3D) contouring cutter path with major motion in a plane parallel to the Z axis onto the X-Y plane or one perpendicular to the Z axis is introduced. A systematic method is developed that can be used to program, in APT or other high-level languages, complex contouring cutter motion based on the concept introduced. As a result, NC programming of contouring motion for many complex engineering parts on a 3-axis numerically controlled (NC) milling machine, which is often considered difficult, can be greatly simplified. Part examples are discussed; and the APT programs defining the cutter path based on the 3D-to-2D mapping concept, are also analyzed in detail. The concept and method introduced proved to be a powerful tool for programming the NC machining process for many parts, particularly dies and molds.

Control of the Error Induced by Cutting Force in NC Milling Machine

2006 ◽  
Author(s):  
Turyagyenda Gelvis ◽  
Jian Guo Yang ◽  
Hao Wu
Keyword(s):  
Cutting Force ◽  
Functional Dependence ◽  
Kinematic Model ◽  
Milling Machine ◽  
Displacement Sensors ◽  
Online Sensor ◽  
Embedded Model ◽  
Nc Milling ◽  
Force Displacement ◽  
Reverse Signal

This paper presents a real-time compensation system for cutting force induced error on CNC miller. Induced errors in form of deformations for individual joints of the transmission system are identified and monitored. A force dynamometer is calibrated in reference to displacement sensors to acts as an online sensor. The Relationships between superimposed forces and corresponding deformations are established. Hence able to indirectly predict the deformations in accordance with the system embedded model. Sequentially is established by duly applying regression analysis to force-displacement data obtained from the experiments. The functional dependence of error on the on the force as prerequisite of appropriation for its relationship with cutting force is modeled. The implementation of the error compensation is done through a predetermined kinematic model that predicts the error according to the online sensor value. Finally relevant error components are disregarded by intercepting the control signal with a reverse signal equivalent to the error.

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