Presentation on lost wax casting

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)

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

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

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

4. Overview

5. 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.

6. 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

7. INTRODUCTION

8. 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.

9. 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

10. Procedure

11. FLOW CHART

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

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

14. 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

15. 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.

16. 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 .

17. 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.

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

19. SUMMARY

20. 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.

21. 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.

22. 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.

23. 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.

24. 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.

25. 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. The lost wax casting is preferable for those machine parts where required difficult machining. Though it is high expensive casting process but this process is suitable for high precision machine parts with perfect measurement. So, it is recommended for precise parts casting which is more valuable then time and cost. CONCLUSION & RECOMANDATION

26. Thank You