Physical Properties of Metals

The physical properties of the metals include luster, colour, size and shape, density, electric and thermal conductivity, and melting point. The following table shows the important physical properties of some pure metals.

A TEXTBOOK OF Machine Design

(S.I. UNITS)

[A Textbook for the Students of B.E. / B.Tech.,

U.P.S.C. (Engg. Services); Section ‘B’ of A.M.I.E. (I)]

2005

EURASIA PUBLISHING HOUSE (PVT.) LTD.

RAM NAGAR, NEW DELHI-110 055

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Selection of Materials for Engineering Purposes

The selection of a proper material, for engineering purposes, is one of the most difficult problem for the designer. The best material is one which serve the desired objective at the minimum cost. The following factors should be considered while selecting the material :

1. Availability of the materials,

2. Suitability of the materials for the working

conditions in service, and

3. The cost of the materials.

The important properties, which determine the utility of the material are physical, chemical and mechanical properties. We shall now discuss the physical and mechanical properties of the material in the following articles.

A TEXTBOOK OF Machine Design

(S.I. UNITS)

[A Textbook for the Students of B.E. / B.Tech.,

U.P.S.C. (Engg. Services); Section ‘B’ of A.M.I.E. (I)]

2005

EURASIA PUBLISHING HOUSE (PVT.) LTD.

RAM NAGAR, NEW DELHI-110 055

Read more........

Structure For Cutting Machine

There is a machine where the object is not moving but it works like a machine moving his tools crab, felts auger (drill press), FRIS machine (milling machine) and grinding. There are also machines in which objects move, but his tools still works like a machine shaved machine, lathe (lathe), and FRIS boring (boring mills). Study the picture below that is the usual processes performed on the engine components.

In figure 2 below the basic structure seen in conventional machine tools. In figure A. rotating workpiece in a lathe, but the tools (cutting tools) silent. On boring machine (figure B) while the object rotates his tools still work. Or sliding sled delivers tooling to the workpiece is usually more fun than spinning on a rotating shift the workpiece on the tool head remains stationary. Figure C and D are respectively

crabs and penyerut machine. Form the structure of both machines is influenced by the size of the workpiece where the workpiece little more suited to be machined crab.

On mowers FRIS, the rotating tool is used only on the drill tool. FRIS machines widely used to cut circular hole, making pathways pegs, creating a gap, sawing, memfris slab and the surface, cut gears and to form the object whose shape is not common.

Figure 2 E is the machine where the tool rotates FRIS combined with the workpiece moving transversely.

translate fr Asyari Daryus - Alat Bantu dan Alat Ukur

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Classification of Engineering Materials

Introduction

The knowledge of materials and their properties is of great significance for a design engineer. The machine elements should be made of such a material which has properties suitable for the conditions of operation. In addition to this, a design engineer must be familiar with the effects which the manufacturing processes and heat treatment have on the properties of the materials. In this chapter, we shall discuss the commonly used engineering materials and their properties in Machine Design.

The engineering materials are mainly classified as :

1. Metals and their alloys, such as iron, steel, copper, aluminium, etc.

2. Non-metals, such as glass, rubber, plastic, etc.

The metals may be further classified as :

(a) Ferrous metals, and (b) Non-ferrous metals.

The *ferrous metals are those which have the iron as their main constituent, such as cast iron, wrought iron and steel.

The non-ferrous metals are those which have a metal other than iron as their main constituent, such as copper, aluminium, brass, tin, zinc, etc.

A TEXTBOOK OF Machine Design

(S.I. UNITS)

[A Textbook for the Students of B.E. / B.Tech.,

U.P.S.C. (Engg. Services); Section ‘B’ of A.M.I.E. (I)]

2005

EURASIA PUBLISHING HOUSE (PVT.) LTD.

RAM NAGAR, NEW DELHI-110 055

Read more........