Monir Koura

• Ain Shams University

End milling is a key machining operation in industrial world, particularly in manufacturing of dies and similar products. Although, such products require high degree of surface roughness, milling operation is taken to be the enough for the cost wise if considering further finishing operations. Thus optimizing the cutting conditions to achieve the o...

ABSTRACT: Several factors affect the accuracy and quality of manufactured parts when machined using circular pocket cycles on CNC machining centers. Such accuracy depends to a great extent on work-piece material, the cutting conditions; namely spindle speed, feed rate, depth of cut and the structure of the fixed cycle. This accuracy plays an import...

Manufacturing of spur gears on CNC machining centers and CNC wire cutting is randomly used due to the difficulty in producing the perfect gear profile. The present paper faces this problem by developing a special cycle that can be used on both types of machines. A code for this cycles is designed to read the part program of any product and if detec...

The construction of a three-dimensional (3D) model of objects is a key element of many interesting applications such as computer graphics and computer-aided design (CAD). Although many techniques for the construction of 3D models are available, these techniques are still the focus of attention from researchers in the computer vision community. In t...

Shape recognition is an important task in the field of computer vision. Many algorithms were developed to extract features from captured images of valuable objects. The traditional polygonal approximation algorithm (PAA) is a well-known algorithm in shape analysis for digital image processing and pattern recognition. The main objective of this algo...

Construction of 3D model of objects is a key element of many interesting applications such as computer graphics and computer aided design (CAD). Although many techniques of the construction of 3D models are available, these techniques are still seeing focused attention from researchers in the computer vision community. In this paper, a low cost vis...

Shape recognition is an important task in the field of computer vision. Many algorithms were developed to extract features from captured images of valuable objects. The traditional polygonal approximation algorithm (PAA) is a well-known algorithm in shape analysis for digital image processing and pattern recognition. The main objective of this algo...

This paper introduces an approach for modeling and representation of geometric tolerances on any 3D solid model using the Objected Oriented Programming (OOP) paradigm. The modeling scheme is supported by a comprehensive validation engine, which certifies the tolerance type against the 3D geometry context both syntactically and semantically. The maj...

In recent years, artificial intelligence played an important role in machine tool automation. Artificial neural networks, as one of the artificial intelligence algorithms, has superiority in representing the relation between the inputs and outputs of the multi‐variable system. Hence, it can be applied to sophisticated operations such as grinding op...

In recent years, artificial neural networks were used in many applications in the field of machining operations. This is because of its capability to represent the multi variable systems and its ability for learning by examples. Grinding operation is the most sophisticated cutting operation and its mode is very hard to achieve accurately. This rend...

Surface roughness evaluation is very important for many fundamental problems such as friction, contact deformation, heat and electric current conduction, tightness of contact joints and positional accuracy. For this reason surface roughness has been the subject of experimental and theoretical investigations for many decades. The real surface geomet...

Stable behaviour of the grinding wheel is particularly important for operation of CNC and automatic grinding machine. A good truing/dressing operation minimises grinding force vibrations and makes grinding behaviour easier to control. Unfortunately, using the same grinding wheel, workpiece material and the same cutting conditions does not mean that...

Surface roughness evaluation is very important for many fundamental problems such as friction, contact deformation, heat and electric current conduction, tightness of contact joints and positional accuracy. For this reason, surface roughness has been the subject of experimental and theoretical investigations for many decades. The real sur face geom...

The cutting edges of a grinding wheel are geometrically undefined in locations and shapes. As a result, generalisation or estimations of the grinding wheel surface condition are difficult to make with any degree of accuracy. Therefore, It is necessary to develop techniques for examining details of the grinding wheel topography in order to ascertain...

Many methods of measuring surface finish have been developed ranging from the simple touch comparator to sophisticated optical techniques. The vision systems are the latest technology for measuring surface roughness. The vision systems are considered relatively less expensive than the optical techniques and they have the advantages of being non-con...

Surfaces of industrial parts need to be specified on the basis of their use and application environment. Hence, surface characterization is vital for design, manufacturing and inspection. Furthermore, the development of new industries has led to a requirement for super-smooth surfaces and for the ability to measure such surfaces accurately; therefo...

Eliminating the gap between the grinding wheel and workpiece is a major time-wasting step during grinding operations. Reducing the time of this step has attracted many investigations. Several researchers have investigated the variation in some process parameters during the wheel-workpiece contact. These parameters include grinding force, grinding p...

In recent years, the advent of high-speed general-purpose digital computers and vision systems has made image analysis easier and more flexible. Images of surfaces captured using vision systems can be used to identify surface texture. In this paper, a new method, called the best grey level histogram (BGLH), is introduced to get the most accurate im...

To improve the methods used to program the available CNC milling machines in the Egyptian industries, a system is suggested to create the data sheet (part program) for the products automatically. The produced data sheet contains all the required information to manufacture the part on a vertical milling machine. The information includes the preparat...

Computer aided part programming for Computerised Numerical Control Machine Tools (CNC) has already forced itself in programming fields. However, in using these techniques the cutting tool diameter is usually assumed. This sometimes results in using the incorrect diameter, thus resulting in the interference between the tool and the part to be machin...

All national and international standards on the assessment of surface roughness are based on the profile of a surface traced by a suitable stylus.The accuracy of this measurement and its numerical evaluation for determining the surface parameters depend on the fidelity of the representation of the trace to the cross-sectional profile of the part. H...

This paper is concerned with the strain rate in the milling process at normal running conditions of speed and feed rate and the metallurgical changes on the machined surfaces as associated with it.Experiments are presented in which 0·84% carbon steel specimens were machined by up and down milling methods at cutting speeds ranging from 28 to 90m/min...

Most of computer procedures for solving the plant layout problems are improvement procedures. All procedures are utilising the pairwise interchange routine as the main mechanism to effect improvements and attempting to minimize TMHC. Kowever procedures disregard the trade-off between resulted reductions in TMHC and relayout costs.

This paper introduces an approach for modeling and representation of geometric tolerances on any 3D solid model using Objected Oriented Programming (OOP) paradigm. The modeling scheme is supported by a comprehensive validation engine, which certifies the tolerance type against the 3D geometry context both syntactically and semantically. The major o...