A CNC Manufacturing Method for Parts with Trochoidal Profile

2014 ◽  
Vol 14 (2) ◽  
pp. 103-113
Author(s):  
Sotiris L. Omirou ◽  
Marios M. Fyrillas
Keyword(s):  
Real Time ◽  
Internal Combustion Engines ◽  
Tool Path ◽  
Industrial Applications ◽  
Combustion Engines ◽  
Interpolation Algorithm ◽  
Cnc Milling ◽  
Manufacturing Method ◽  
Mechanical Parts ◽  
Milling Machines

AbstractThis paper presents a manufacturing method for parts with trochoidal profile on CNC milling machines. The method is based on a new real-time interpolation algorithm capable to drive the cutter along the offset of trochoid curves with precision equal to the resolution of the machine. The structure of the presented algorithm may be adapted accordingly so as to be used either for parts with an epitrochoidal or a hypotrochoidal profile. Both types of curves, known as trochoid curves, have important industrial applications such as gears with trochoidal tooth-profile, cams, trochoidal-shaped housings for rotary internal combustion engines and rotary piston pumps etc. The effectiveness and accuracy of the proposed method is verified by simulation tests of the generated tool path for the machining of two representative mechanical parts, an inner rotor of a hypogerotor pump and an epitrochoidal-shaped housing.

Development of CAM System for 3D Surface Machining With CNC Lathe (Tool Path Generation Considering Acceleration)

2014 ◽  
Author(s):  
Keigo Takasugi ◽  
Katsuhiro Nakagaki ◽  
Yoshitaka Morimoto ◽  
Yoshiyuki Kaneko
Keyword(s):  
Lead Time ◽  
Internal Combustion Engines ◽  
Tool Path ◽  
Tool Path Generation ◽  
Combustion Engines ◽  
Determination Method ◽  
Experimental Procedure ◽  
Surface Machining ◽  
Cnc Lathe ◽  
Lathe Tool

This study developed a method called non-axisymmetric curved surface turning (NACS-Turning) for a CNC lathe composed of a turning axis and two translation axes. The NACS-Turning method controls the three axes synchronously. This new machining method can reduce the lead time for non-circular shapes such as cam profiles or pistons for internal combustion engines. In our previous report, we presented an outline of a machining principle and a CAM system for NACS-Turning. However, at the same time, we found the problem that the X-axis slide exceeds the allowable acceleration. Therefore, it is preferable that the acceleration is verified during the cam application, and the tool path is generated within the allowable acceleration range. Therefore, this paper first describes the determination method of machinable conditions for NACS-Turning in the cam application. Next, based on the result, relationships between the acceleration of the X-axis slide and machining conditions are clarified. Finally, the experimental procedure showed that our proposed method does not exceed the allowable acceleration of the X-axis slide.

A Real-Time C3 Continuous Tool Path Smoothing and Interpolation Algorithm for Five-Axis Machine Tools

2020 ◽  
Vol 142 (4) ◽  
Author(s):  
Qin Hu ◽  
Youping Chen ◽  
Xiaoliang Jin ◽  
Jixiang Yang
Keyword(s):  
Coordinate System ◽  
Real Time ◽  
Machine Tools ◽  
Tool Path ◽  
Maximum Deviation ◽  
Interpolation Algorithm ◽  
Tool Orientation ◽  
Path Smoothing ◽  
Tip Position ◽  
Five Axis

Abstract Local corner smoothing method is commonly adopted to smooth linear (G01) tool path segments in computer numerical control (CNC) machining to realize continuous motion at transition corners. However, because of the highly non-linear relation between the arc-length and the spline parameter, and the challenge to synchronize the tool tip position and tool orientation, real-time and high-order continuous five-axis tool path smoothing and interpolation algorithms have not been well studied. This paper proposes a real-time C3 continuous corner smoothing and interpolation algorithm for five-axis machine tools. The transition corners of the tool tip position and tool orientation are analytically smoothed in the workpiece coordinate system (WCS) and the machine coordinate system (MCS) by C3 continuous PH splines, respectively. The maximum deviation errors of the smoothed tool tip position and the tool orientation are both constrained in the WCS. An analytical synchronization algorithm is developed to guarantee the motion variance of the smoothed tool orientation related to the tool tip displacement is also C3 continuous. The corresponding real-time interpolation method is developed with a continuous and peak-constrained jerk. Simulation results verify that the maximum deviation errors caused by the tool path smoothing algorithm are constrained, and continuous acceleration and jerk of each axis are achieved along the entire tool path. Comparisons demonstrate that the proposed algorithms achieve lower amplitude and variance of acceleration and jerk when compared with existing methods. Experiments show that the proposed five-axis corner smoothing and interpolation algorithms are serially executed in real-time with 0.5-ms cycle.

Acoustic Modelling and Measurements of Engine Mufflers

1998 ◽  
Vol 5 (1) ◽  
pp. 27-38
Author(s):  
Samir N.Y. Gerges ◽  
Márcio R. Kimura ◽  
J.L. Bento Coelho
Keyword(s):  
Internal Combustion Engines ◽  
Transmission Loss ◽  
Noise Source ◽  
Internal Combustion ◽  
Industrial Applications ◽  
Combustion Engines ◽  
Acoustic Modelling ◽  
Exhaust Noise ◽  
Ic Engines ◽  
Diesel Motors

Most buildings such as hospitals, hotels, governmental offices, data processing rooms, etc, are equipped with internal combustion engines, diesel motors and generators to supply energy in emergencies. These same IC engines are used for industrial applications, building services and transportation. Exhaust noise are the predominant noise source with most internal combustion engines and thus exhaust systems incorporating mufflers have been designed to reduce the noise. This paper describes the analysis of several configurations of mufflers and also presents comparisons between the results for the transmission loss obtained by numerical modelling (FEM), Transfer Matrix Method (TMM) and measurements.

A CNC Parametric Programming Method for Manufacturing of Axisymmetric Mould Cavities

2016 ◽  
Vol 16 (3) ◽  
pp. 173-181
Author(s):  
Sotiris L. Omirou
Keyword(s):  
Plane Curve ◽  
Parametric Programming ◽  
Cnc Milling ◽  
Programming Technique ◽  
Manufacturing Method ◽  
Programming Tool ◽  
Milling Machines ◽  
Cnc Programming ◽  
G Code ◽  
Tool Motion

AbstractThis paper presents a convenient and an easy to use manufacturing method for parts with axisymmetric geometry on CNC milling machines. The desired form of the cavities is achieved by selecting as generatrix curve any plane curve, implicitly or parametrically defined, which fulfills specific imposed by the user criteria (functional, aesthetic or other). Each machining pass is modelled as a path composed of generatrix curve segments and semicircular arcs. The surface quality is controlled by keeping the distance between successive scallops within a programmed value. Tool motion along the desired paths is generated by G-code algorithms that exploit the parametric programming technique, a powerful CNC programming tool. The effectiveness of the proposed method is verified by simulation tests for three representative curves.

Real-time brake torque estimation for internal combustion engines

2008 ◽  
Vol 22 (2) ◽  
pp. 338-361 ◽  
Author(s):  
Javier Franco ◽  
Matthew A. Franchek ◽  
Karolos Grigoriadis
Keyword(s):  
Real Time ◽  
Internal Combustion Engines ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Brake Torque ◽  
Torque Estimation

Characterization of Real Time Producer Gas Generation From Paper Sludge Gasification

2013 ◽  
Author(s):  
Yunye Shi ◽  
Tejasvi Sharma ◽  
Albert Ratner
Keyword(s):  
Real Time ◽  
Internal Combustion Engines ◽  
Paper Sludge ◽  
Producer Gas ◽  
Combustion Engines ◽  
Gas Generation ◽  
Higher Temperature ◽  
H2 Formation ◽  
Combustible Gases

Biomass Gasification is incomplete combustion of biomass resulting in production of combustible gases consisting of Carbon monoxide (CO), Hydrogen (H2) and traces of Methane (CH4), the mixture of which is called producer gas. Producer gas can be cleaned and directly used in internal combustion engines or can be converted to various attractive biofuels. The paper sludge is a byproduct produced from recycled cardboard and into pallets. This paper is focused on gasification of paper sludge and its real-time gas evolution through this process. Variables include temperature; equivalence ratio and superficial velocity were tested and analyzed. Results demonstrate that CO2 and H2 formation is favored at higher temperature and higher oxygen concentrations. CO production is ruled by oxidation and water shift reactions but it is difficult to determine from two single variables.

Research on Real-Time Fuel Consumption Measurement in Internal-Combustion Engines

2013 ◽  
Vol 760-762 ◽  
pp. 1159-1163
Author(s):  
Gang Li ◽  
Rui Feng Bai ◽  
Ying Hao ◽  
Yu Chen Li
Keyword(s):  
Real Time ◽  
Fuel Consumption ◽  
Flow Measurement ◽  
Internal Combustion Engines ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Parameter Matching ◽  
A New Technique ◽  
Real Flow ◽  
Prototype Measurement

A new technique was devised to deal with real-time fuel consumption measurement in internal-combustion engines, where fuel circulation flow is much larger than the consumption rate. With extensive experiments and error analysis method, the fuel mass flow measurement had been realized by a improved turbine flow sensor with temperature compensation. The real-time accurate fuel consumption measurement had been achieved through data processing and real flow parameter matching method. The results showed that the prototype measurement precision was 1.0 class, satisfying practical measurement requirements.

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