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Anonymous Poster

die crack

01/13/2008 3:40 AM

Dear All

WE ARE INTO BRASS FORGING ,RECENTLY WE HAD COMPONENT FOR DEVELOPMENT IN WHICH WE ARE FACING A PROBLEM OF DIE CRACK, DOWN ENERGY FOR THE COMPONENT IS BIT HIGH THAN THE NORMAL,& TO KEEP THE DIMENTIONS WITH IN SPEC WE HAVE TO COOL THE DIE & WE HAVE TO SPRAY A LUBRICANT VERY FREQUENTLY,

BLANK TEMP:-730 DEG CENTI

DIE TEMP:-110 DEG CENTI

SPEED OF PRESS :-52

so what according to you can be the cause of cracking

Regards

Ankit
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Anonymous Poster
#1

Re: die crack

01/14/2008 1:10 AM

Die cracks occur mainly due to the following reasons.

1.Tool material

Die should be made out of hot working steel H13. This will withstand hardness and toughness upto 500 deg. centigrade

2. Die heat treatment

Die heat treatment should be free from decarburisation,scaling and free from internal stresses. The hardness should be between HRC 45 to 48. Tempering should be done atleast three times. Total heat treatment in Vacuum funace is preferred

3. Die cooling

Continuous cooling arrangement is required while in use.

4.Perodical stress relieving / stress tempering should be done to minimise fatique thermal stresses

Gopalan, Tech. director,Lakshmi Vacuum Heat treaters,Bangalore.

M. +91 9243431481
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