scholarly journals Overview Role of Simulation Package in Virtual Manufacturing and for CNC Machinery

2018 ◽  
Vol 7 (2.8) ◽  
pp. 702
Author(s):  
R. Mahesh ◽  
J. Ganesh Murali ◽  
R. Arulmurugan
Keyword(s):  
Tool Path ◽  
Manufacturing Sector ◽  
Virtual Manufacturing ◽  
Manufacturing Industries ◽  
Numerical Control ◽  
Production Volume ◽  
Software Packages ◽  
Development Cycle ◽  
Additional Role

Computer Numerical Control Machines (CNC) totally changed the scenario in manufacturing industries in terms of production volume, easy flexibility and with fewer deviations.    As customers expect high grade of accuracy, precision, reliable and prompt supply it became essential in the manufacturing sector to reduce the time for developing and proving out new products. Normally programming and proving out the same plays a significant role in the product development cycle. Nowadays several software packages are there to stimulate the tool path, sequence of operations and validation of the program to ensure flawless performance. These packages do serve additional role of optimizing the program sequence and reduce the cycle time involved to manufacture the parts concerned.

scholarly journals Are the determinants of markup size industry-specific? The case of Slovenian manufacturing firms

2011 ◽  
Vol 58 (2) ◽  
pp. 229-244 ◽  
Author(s):  
Nina Ponikvar ◽  
Maks Tajnikar
Keyword(s):  
Manufacturing Sector ◽  
Manufacturing Firms ◽  
Manufacturing Industries ◽  
Dynamic Panel ◽  
Pricing Policy ◽  
Large Variability ◽  
Oligopoly Theory ◽  
Determination Process ◽  
Precise Role

The aim of this paper is to identify factors that affect the pricing policy in Slovenian manufacturing firms in terms of the markup size and, most of all, to explicitly account for the possibility of differences in pricing procedures among manufacturing industries. Accordingly, the analysis of the dynamic panel is carried out on an industry-by-industry basis, allowing the coefficients on the markup determinants to vary across industries. We find that the oligopoly theory of markup determination for the most part holds for the manufacturing sector as a whole, although large variability in markup determinants exists across industries within the Slovenian manufacturing. Our main conclusion is that each industry should be investigated separately in detail in order to assess the precise role of markup factors in the markup-determination process.

Increasing Productivity Using Parametric Data and Macros

1991 ◽  
Author(s):  
Robert W. Gorman
Keyword(s):  
Automatic Design ◽  
High Quality ◽  
Software Packages ◽  
Parametric Data ◽  
Development Cycle ◽  
Modeling Techniques ◽  
Increase Productivity ◽  
Product Development Cycle ◽  
Model Components

Abstract Computer-aided Engineering (CAE) has successfully helped engineers in the 1980’s to decrease the product development cycle. This has allowed companies to define high-quality, competitively priced products. In the 1990’s, companies must expand the role of CAE to help decrease the development cycle even more (i.e., increase the productivity of CAE). This paper will discuss two modeling techniques that can help designers/analysts initially define a computer model and automatically update this model when a component is altered. These techniques are the ability to define the model in terms of parametric data and to customize software packages to fit a company’s particular needs, by using macros. Designers who produce variations of a basic design or who model components geometrically based on other components will be able to increase their productivity using these techniques. Several examples will be used to illustrate how these techniques will increase productivity and how automatic design optimization may be used.

Virtual Manufacturing of Straight Bevel Gear Based on Pro/E Wildfire

2014 ◽  
Vol 1044-1045 ◽  
pp. 902-905
Author(s):  
Ji Shun Lin
Keyword(s):  
Tool Path ◽  
Control Program ◽  
Virtual Manufacturing ◽  
Numerical Control ◽  
Milling Machine ◽  
Post Processing ◽  
Milling Cutter ◽  
Straight Bevel Gear ◽  
Nc Milling ◽  
Finishing Machining

Making use of function of NC programme provided by Pro/NC, aiming at general NC milling machine and using general milling cutter, this thesis attempts to establish the tool path of straight bevel gear’s finishing machining and then put forward the idea of processing piece by piece. In this way, “over cutting” and “short cutting” can be avoided and the precision of process can be improved. Finally, the accuracy of product designing and manufacture can be tested by post-processing of numerical control program of straight bevel gear’s finishing processing with the VERICUT’s simulating.

A Three-Dimensional Virtual Manufacturing System with High Confidence for Turning

2013 ◽  
Vol 694-697 ◽  
pp. 2442-2448
Author(s):  
Qing Feng Gao ◽  
Guo Wei Yu ◽  
Yu Wang Song
Keyword(s):  
Data Structure ◽  
Confidence Level ◽  
Manufacturing System ◽  
Tool Path ◽  
Three Dimensional ◽  
Virtual Manufacturing ◽  
Numerical Control ◽  
High Confidence ◽  
Cutting Path ◽  
High Confidence Level

The tool trace of turning is intensive and complex, and its virtual manufacturing with high confidence level needs to be solved urgently. In response to this pressing need, based on the general mathematical model of master-slave alignment for shaft part profiles, efficient and low-redundancy "dynamic grid" for data structure and "tool driving" exact algorithm for cutting path, the paper built a database that was flexible to adapt the data structure, packaged an Open Graphics Library (OpenGL) to form the automatic three-dimensional engine, and developed a three-dimensional virtual manufacturing system with high confidence level for turning, with numerical control code analysis, error correction, tool path simulation of turning process, parts management, all-round display, virtual manufacturing process control and other functions.

scholarly journals The Time Profile of the Cost Structure in Pakistan’s Manufacturing Sector

1999 ◽  
Vol 38 (4II) ◽  
pp. 1101-1116
Author(s):  
Eatzaz Ahmad ◽  
Muhammad Idrees
Keyword(s):  
Manufacturing Sector ◽  
Time Profile ◽  
Cost Structure ◽  
Manufacturing Industries ◽  
Competitive Environment ◽  
Substantial Growth ◽  
Tax Holidays ◽  
The 1960S ◽  
The Cost

The manufacturing sector of Pakistan has at times played the role of the leading sector of the economy. The successful experience of planned growth in the 1960s owes much to the special attention paid to the growth of manufacturing sector. Policies like the export bonus scheme, tax-holidays, subsidised import of capital, easy and subsidised loans and over-valued exchange rate, resulted in a substantial growth in the sector. However, with over-protection of the sector, nationalisation of some of the major industries in the 1970s and, later-on, over-employment in the nationalised industries, the performance of the sector started to deteriorate gradually. It is now widely believed that many of the manufacturing industries in Pakistan have become inefficient because they have not been exposed to competitive environment due to protective and distortionary policies.

Adaptive spiral tool path generation for computer numerical control machining using point cloud

2021 ◽  
pp. 095440622199007
Author(s):  
Mandeep Dhanda ◽  
Aman Kukreja ◽  
SS Pande
Keyword(s):  
Tool Path ◽  
Cnc Machining ◽  
Numerical Control ◽  
Numerical Control Machining ◽  
Form Errors ◽  
Spiral Tool Path ◽  
Novel Method ◽  
Mesh Grid ◽  
Cloud Of Points ◽  
Cam Software

This paper reports a novel method to generate adaptive spiral tool path for the CNC machining of complex sculptured surface represented in the form of cloud of points without the need for surface fitting. The algorithm initially uses uniform 2 D circular mesh-grid to compute the cutter location (CL) points by applying the tool inverse offset method (IOM). These CL points are refined adaptively till the surface form errors converge below the prescribed tolerance limits in both circumferential and radial directions. They are further refined to eliminate the redundancy in machining and generate optimum region wise tool path to minimize the tool lifts. The NC part programs generated by our algorithm were widely tested for different case studies using the commercial CNC simulator as well as by the actual machining trial. Finally, a comparative study was done between our developed system and the commercial CAM software. The results showed that our system is more efficient and robust in terms of the obtained surface quality, productivity, and memory requirement.

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.

scholarly journals Excision and transposition of Tn5 as an SOS activity in Escherichia coli.

Genetics ◽  
1991 ◽  
Vol 128 (1) ◽  
pp. 45-57 ◽  
Author(s):  
C T Kuan ◽  
S K Liu ◽  
I Tessman
Keyword(s):  
Escherichia Coli ◽  
Binding Site ◽  
Reca Protein ◽  
Precursor Molecule ◽  
Functional Integrity ◽  
Lexa Protein ◽  
Lexa Binding ◽  
Additional Role ◽  
Stimulation Of

Abstract Excision and transposition of the Tn5 element in Escherichia coli ordinarily appear to occur by recA-independent mechanisms. However, recA(Prtc) genes, which encode RecA proteins that are constitutively activated to the protease state, greatly enhanced excision and transposition; both events appeared to occur concomitantly and without destruction of the donor DNA. The recombinase function of the RecA protein was not required. Transposition was accompanied by partial, and occasionally full, restoration of the functional integrity of the gene vacated by the excised Tn5. The stimulation of transposition was inhibited by an uncleavable LexA protein and was strongly enhanced by an additional role of the RecA(Prtc) protein besides its mediation of LexA cleavage. To account for the enhanced transposition, we suggest that (i) there may be a LexA binding site within the promoter for the IS50 transposase, (ii) activated RecA may cleave the IS50 transposition inhibitor, and (iii) the transposase may be formed by RecA cleavage of a precursor molecule.

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