Difference between hammer and press forging?

[fiddler30]

Hi to all,
Could someone explain the difference between hammer forging and press forging.
I understand the process of both methods but I need to understand more in depth the difference in structure, grain flow, hardness etc if any.
We have been successfully machining 42crmo4 Hammer forged square bar for 4 years.
Now we have to machine 42crm04 Press forged round bar, it is virtually un-machineable.
So we have the same material spec but it behaves very differently.

Can anyone help??
Many thanks

 

[jsgruszynski]

Hi to all,
Could someone explain the difference between hammer forging and press forging.
I understand the process of both methods but I need to understand more in depth the difference in structure, grain flow, hardness etc if any.
We have been successfully machining 42crmo4 Hammer forged square bar for 4 years.
Now we have to machine 42crm04 Press forged round bar, it is virtually un-machineable.
So we have the same material spec but it behaves very differently.

Can anyone help??
Many thanks

Most likely gets down to something related to http://en.wikipedia.org/wiki/Work_hardening" differences between hammer and press, and the forging temperature.

 

[mrajm]

Hi..
We have both roots for the crankshaft assembly that we manufacture.
The stock removal is lesser in case of press forged component as they more accurate in dimension but as far as machining is concerned there is a little difference between the two.
There can be something wrong with the heatreatment oe material of the components.
We will have to check that.

 

[beatricezhu]

hello,

we can machine the 42CrMo4 forged round bars.

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(1) Our company profile.
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We specialize in producing forged metals in different shapes and specifications. Our product quality has passed ISO9001:2008, shipping register of China, South Korea, Japan, Italy, France and so on. Being famous for its preferable quality and competitive price, our products enjoy great reputation both at home and abroad. More than 50% of our products are exported to overseas.
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300 kinds of steel forging products in 13 series, such as alloy structural steel, alloy tool steel, carbon structural steel, carbon tool steel, bearing steel, stainless steel. Shapes---forged round bars, forged flat bars, forged square bars, forged blocks, etc.(AISI 4140, AISI 1045, AISI 4340, AISI 52100, AISI 8620, AISI 8620H, AISI4130, 34CrNiMo6, S355J2G3, 39CrNiMo3, H13, P20, 17CrNiMo6...etc.)
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Forged Round Bars--- Φ 80-1000mm;
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Company: Qilu Special Steel Co., Ltd
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E-mail: steel.group@hotmail.com
Skype: alicechuh