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Participant

Join Date: Oct 2009
Posts: 3

Clamping Load in Transfer Moulds

10/19/2009 7:44 PM

We want to buy a rubber transfer moulding machine to make a part whose area perpendicular to the direction of compression is about 28 square inches. I saw a formula for calculating clamping loads in injection moulding machines in this forum. Should the same formula be used for transfer moulding machines also? We have been offered a used machine with a clamping load of 35tons but want to make sure that the clamping load is enough. Thanks for your help

ranga

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Guru

Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#1

Re: clamping load in transfer moulds

10/19/2009 10:34 PM

If you apply the general rule of one ton (clamp pressure) per square inch (of part area), you should be fine.

you have 5/4 capacity. Watch your transfer speed.

The more viscous the material, the more clamp you need.

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Participant

Join Date: Oct 2009
Posts: 3
#2
In reply to #1

Re: clamping load in transfer moulds

10/20/2009 6:11 AM

Lylynch.

Thanks a lot for the quick reply. Your reply to a previous email regarding clamping loads for injection moulds was very extensive and informative.

cheers

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Commentator

Join Date: May 2008
Location: St. Paul , MN
Posts: 79
Good Answers: 6
#3
In reply to #1

Re: clamping load in transfer moulds

10/20/2009 11:37 PM

I would check with the material vendor for their recommendation. I have seen transfer molding cavity pressures exceeding 5000 psi. With 28 square inches you may need as much as 70 tons of clamping force. I would go to the source for an answer so critical for your success.

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Anonymous Poster
#4
In reply to #3

Re: clamping load in transfer moulds

10/21/2009 6:25 AM

dadio926,

Thanks for the suggestion. Will check with the material supplier.

cheers

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