Influence Of EDM Machining On Surface Integrity Of SKD 11 Tool Steel
This paper presents a study on influence of Electrical Discharge Machining to surface integrity of SKD 11 tool steel. The factors that concerned in this paper were pulse on time and peak current. The surface integrities that have been checked were, white layer thickness and surface hardness. EDM...
Saved in:
| Main Author: | |
|---|---|
| Format: | Monograph |
| Published: |
UTeM
2009
|
| Subjects: | |
| Online Access: | http://library.utem.edu.my:8000/elmu/index.jsp?module=webopac-d&action=fullDisplayRetriever.jsp&szMaterialNo=0000051641 http://library.utem.edu.my:8000/elmu/index.jsp?module=webopac-d&action=fullDisplayRetriever.jsp&szMaterialNo=0000051641 http://eprints.utem.edu.my/4532/1/Influence_Of_EDM_Machining_On_Surface_Integrity_Of_SKD_11_Tool_Steel_-_Chan_Wai_Weng_-_TJ1191.C42_2009_24_Pages.pdf http://eprints.utem.edu.my/4532/2/Influence_Of_EDM_Machining_On_Surface_Integrity_Of_SKD_11_Tool_Steel_-_Chan_Wai_Weng_-_TJ1191.C42_2009.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | This paper presents a study on influence of Electrical Discharge Machining to
surface integrity of SKD 11 tool steel. The factors that concerned in this paper were
pulse on time and peak current. The surface integrities that have been checked were,
white layer thickness and surface hardness. EDM is essentially a thermal process
with a complex metal –removal mechanism, involving the formation of plasma
channel between the tool and workpiece electrode. The sparks produced during the
EDM process locally melt the metal surface, which then undergoes an ultrarapid
quenching. After solidification, a layer is formed at the workpiece surface, the socalled
white layer. By using DOE full factorial design, 16 trials have been carried out.
Each of the 10mmX10mm cross sectional area block of tool steel was EDMed by
copper electrode with pulse on time and peak current varies. The EDMed surfaces of
blocks were observed for its white layer thickness and surface. The results were
analyzed to determine the most significant impact factor and relationship of the
parameters selected with the WLT and surface hardness. With respect to white layer
thickness, both factors were found to be insignificant, but peak current was the most
impact factor compared to pulse on time. Both factors are proportional to the white
layer thickness, while peak current and pulse on time increase, the white layer was
also increase. On the other hand, with respect to surface hardness, both of the effects
were insignificant. The relationship of the factor and surface hardness is direct
proportional. |
|---|