How Does Temperature Effect Punching Steel Flats?

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madhav Participant Join Date: Feb 2010 Posts: 2	How Does Temperature Effect Punching Steel Flats? 02/10/2010 1:21 AM
	we r doing punching oeration for flat, thickness of the flat is 16mm & hole dia. 22mm. Material in steel how can i increase the life of punchthe ? can it is recomanded to increase temp. of flat? if yes than up to what temp. (degree celcius) ? what will be the economical methods to heat the flats, induction or gas heating?
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Milo Guru Join Date: Jul 2006 Location: "Dancing over the abyss." Posts: 4884 Good Answers: 243	#1 Re: How Does Temperature Effect Punching Steel Flats? 02/12/2010 11:23 PM
	Better steel for punch. Heating the steel in air will likely create oxides which will increase abrasion on the punch. You really need to consider the grade of steel and its hardness ductility and microstructure. And the failure mode of the punch currently. milo __________________ People say between two opposed opinions the truth lies in the middle. Not at all! Between them lies the problem, what is unseeable,eternally active life, contemplated in repose. Goethe
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madhav Participant Join Date: Feb 2010 Posts: 2	#2 In reply to #1 Re: How Does Temperature Effect Punching Steel Flats? 02/13/2010 11:48 PM
	hi, thanx for ur valueable replay. i have missed most important point that we r doing cold punching operation. i want ur opinion can i heat the material to modaret temperature so that cold punching become smooth & can it will increase the life of punch i.e. it will work last longer before it broken.
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Milo Guru Join Date: Jul 2006 Location: "Dancing over the abyss." Posts: 4884 Good Answers: 243	#3 In reply to #2 Re: How Does Temperature Effect Punching Steel Flats? 02/14/2010 9:08 AM
	To answer this question you need to know the flow stress of the steel at the current and proposed temperature. That means you have to identify the steel, then do a literature search or else "warm" tensile testing. In my experience, unless you are talking about one of the new high strength or ultra highstrength automotive steels, the answer is no. Also, beware of blue brittlenes temperature range of around 600 degrees F. milo __________________ People say between two opposed opinions the truth lies in the middle. Not at all! Between them lies the problem, what is unseeable,eternally active life, contemplated in repose. Goethe
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sceptic Guru Join Date: Oct 2008 Location: Cairns, Qld, Australia Posts: 968 Good Answers: 65	#4 Re: How Does Temperature Effect Punching Steel Flats? 02/16/2010 12:55 AM
	Would punch lubrication help?
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madhav (1); Milo (2); sceptic (1)

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