All the process and flowchart of Lost wax casting with example and details working Process. Made by: Shaiful islam majumder Dhaka University of Engineering & Technology(DUET)

2. Welcome to the Presentation on
Lost Wax Casting
Subject : Production Process -1 Subject Code : ME-3301
Department of Mechanical Engineering , DUET

3. Lost Wax Casting
Presentation by-
143101. Abu Bakkar Siddik
143102. Shaif ul-Islam Majumder
143103. Azizur Rahman
143104. Nazrul Islam
143105. Ahasanul Alam

4.  Overview
 Introduction
 Procedure
 Advantages
 Disadvantages
 Applications
 Comparison
 Conclusion
Table of Contents'

5. Overview

6. Lost wax casting technique
is most oldest and most
advanced process of the
metallurgical art.
Lost Wax Method dates
back to at least fourth
millennium B.C. and was
originated in china.

7. From 5000 year back, when
beeswax formed the pattern , Now
a days high-tech waxes are used
in molding.
Lost wax casting is classified
from investment casting.
At present world , Lost wax
casting touches most of the
equipment of our daily life .
4000 years old casting

8. INTRODUCTION

9. INTRODUCTION
Commonly referred to as lost wax casting.
The Pattern is made up of wax or plastic such as polystyrene.
because of low melting temperature.
The molten metal is poured into the ceramic mold and mold is
formed using high quality wax most of the time.
The wax pattern is melted out of the mold after it has been formed.

10. INTRODUCTION
Lost wax casting can make use of
most metals, common alloys, such
as Al,Bronze,Mg alloys , Cast iron,
Stainless steel and tool steel.
The lost wax casting can operate
with high temperature.
Complex geometry parts can be
made easily by lost wax process

11. Procedure

12. FLOWCHART

13.  Manufacturing wax
pattern.
 Master die Desired.
 Add allowances.
1.Pattern Making

14. •Different wax pattern
combine for a single
casting
•Making wax pattern tree
2.Assembly

15. 3. Shall Building
 Dipping assembly in a refractory slurry .
 The thickness of slurry about 7 mm.
 Refractory slurry are made from-
(a) Grained silica
(b) Water
(c) Binders
 Then achieved required ceramic coating

16. 4. Dewax
 Allow to harden in air
 Put in high temperature
Steam chamber for 5 to
10 minutes.
 Waxes melt out of the
shape and make cavity
for pouring with metal.

17. 5. Pouring with metal
 Ceramic mold further heated (550-
1100) for 2 to 3 hours.
 Remove any left wax from the
cavity.
 Then poured with melted metal of
1200 degree centigrade.

18. 6. KNOCKOUT AND CUT OFF
 After the casting is cooled
down, the mold shall is
chipped out from casting
 Gates and rammers are cut
from the casting.

19. • Cut off parts are
subjected to machinery
operation.
• Final technical found by
machining precisely.
7.MACHINING

20. SUMMARY

21. ADVANTAGES
1. Many Intricate forms with undercuts can be cast.
 A very smooth surface is obtained with no parting
line.
 Dimensional accuracy is good.
 Certain unmachinable parts can be cast with lost wax
casting to preplanned shape.
It may be used to replace die casting where short
runs are involved.

22. DISADVANTAGES
This process is expensive, is usually limited to small
casting.
Holes cannot be smaller than 1/16 in. (1.6 mm) and
should be no deeper than about 1.5 times of the
diameter.
 Lost wax casting require very long production-cycle
times versus other casting processes.
 This process is practically infeasible for high-volume
manufacturing, due to its high cost and long cycle times.

23. APPLICATION OF LOST WAX
CASTING
• Lost wax process is being
used from time immemorial
for casting jewelry and small
parts it is also used to
manufacture fashion
accessories like brooches and
buckles.

24. APPLICATION OF LOST WAX CASTING
• some automobile manufacturers
use a lost foam technique to make
engine blocks.
• Now a days lost wax process is used
for dental restoration , fine jewelry,
sculptures, etc.
• Silver , Gold, Aluminum, brass or
bronze are cast with this method.

25. Comparison with others
Sand Casting
 Relatively inexpensive production costs, especially in low-volume runs.
 The ability to fabricate large components.
 A capacity for casting both ferrous and non-ferrous materials.
 A low cost for post-casting tooling.
Investment casting
 A high degree of accuracy and precise dimensional results.
 The ability to create thin-walled parts with complex geometries.
 The capacity for casting both ferrous and non-ferrous materials.
 Relatively high-quality surface finish and detail in final components.

26. o In spite of having many advantages ,Lost wax casting has some
limitations being more expensive in large metal production ,
though it is preferable for casting small & complex part of
different applications.
o The lost wax casting is preferable for those machine parts
where required difficult machining.
o Though it is high expensive casting process but this process is
suitable for high precision machine parts with perfect
measurement.
o So, it is recommended for precise parts casting which is more
valuable then time and cost.
CONCLUSION & RECOMANDATION

27. Thank You