Cold Working of Metals Lab

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LIVERPOOL JOHN MOORES UNIVERSITY
School of Engineering, Technology and Maritime Operations

COLD WORKING OF METALS

Author: Student No: Module Code: Module title: Date:

S. S. Hlongwane 508450 5065ENG Materials 31/10/2011

5065ENG

COLD WORKING OF METALS REPORT CONTENTS

S.S. HLONGWANE 508450

1

INTRODUCTION ............................................................................................................................... 3 1.1 1.2 BACKGROUND ......................................................................................................................... 3 AIMS & OBJECTIVES OF EXPERIMENTATION .......................................................................... 3

2 3 4 5 6 7

APPARATUS ..................................................................................................................................... 4 METHOD.......................................................................................................................................... 5 RESULTS........................................................................................................................................... 6 DISCUSSION................................................................................................................................... 10 CONCLUSION ................................................................................................................................. 11 BIBLIOGRAPHY .............................................................................................................................. 12

5065ENG 1 INTRODUCTION

COLD WORKING OF METALS

S.S. HLONGWANE 508450

1.1

BACKGROUND

Dislocations affect the mechanical properties of metals. During the cold working of metals, dislocation build up affect the material’s resistance to deformation. Cold working is an ideal procedure for observing deformation in metals.

1.2
 

AIMS & OBJECTIVES OF EXPERIMENTATION

Cold roll a specimen of annealed brass several times at room temperature. Measure the room’s temperature, initial thickness and hardness of the specimen prior to roll milling.

 

Identify the rolling mill’s power and compression load during every mill. Measure the thickness, hardness and temperature of the material before and after each roll mill.



Measure the hardness of the similar sort of specimen used in the previous identical experiment.



Recognise the meaning of the results concerning the materials properties.

5065ENG 2 APPARATUS
    

COLD WORKING OF METALS

S.S. HLONGWANE 508450

Annealed brass (70% Cu, 30% Zn). Davy Loewy Robertson rolling mill. Micrometer. Rockwell B scale. Infrared thermometer.

5065ENG 3 METHOD

COLD WORKING OF METALS

S.S. HLONGWANE 508450

A specimen of annealed brass was passed through a rolling mill numerous times. The space between the rolling mill’s rollers was decreased by divisions of 0.3, before each mill. Prior to the experiment the following factors were measured: I. II. III. Initial thickness of the specimen using a micrometer. Hardness of the specimen using the Rockwell B scale. Room temperature.

The factors measured before and after each pass of the specimen through the rolling mill are: IV. V. VI. The temperature of the specimen using an infrared thermometer. The thickness of the bar using a micrometer. The hardness of the bar using the Rockwell B scale.

The rolling mill’s parameters obtained from the mill’s gauges as the specimen passed through the mill are: VII. VIII. Compression load. Power.

The hardness of a similar type of specimen used in a previous identical experiment annealed by heating to a temperature of about ( using the Rockwell B scale. ) for a minimum of 30 minutes was measured

5065ENG 4 RESULTS

COLD WORKING OF METALS

S.S. HLONGWANE 508450

Table 1 shows the data for cold rolling of annealed brass.
TEMP. ( ) T2 THICKNESS ( ) T DEFORMATION...
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