Previous in Forum: Coffee Pots That Spill   Next in Forum: Collapsible Tube Caps and Nozzles
Close
Close
Close
11 comments
Participant

Join Date: Sep 2009
Posts: 1

Press Brake

09/21/2009 10:52 PM

I have 70130 accurpress 130 ton I can set it to bend 90 degree on 5052 aluminum .125 the first pcs it works great. every pcs after that it bends to much or it will not bend it far enough I can adjust it again and it will do the same thing again does anyone have a suggestion. Thanks USA

Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be Good Answers:

These comments received enough positive ratings to make them "good answers".

Comments rated to be "almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, rate them!
Guru
Hobbies - DIY Welding - New Member

Join Date: Apr 2008
Location: Bristol, Tennessee
Posts: 1176
Good Answers: 57
#1

Re: Press Brake

09/23/2009 12:26 AM

5052 sounds like pretty high grade aluminum. Is it tempered? I've heard of metal having a personality from coming thru the rollers. Try marking your sheet with lines so it looks like wood grain, and then do all your bends either with the grain or against it, whatever gets you the most pieces.

If the aluminum is tempered, soot the area to be bent with raw acetylene, and then heat it up until the soot burns away, no hotter. When cooled,(slowly, no quenching!) the aluminum will be dead.

__________________
mike k
Register to Reply Score 1 for Good Answer
Guru
United Kingdom - Member - Not a new member!

Join Date: Jun 2008
Location: USA/Europe
Posts: 4547
Good Answers: 68
#2

Re: Press Brake

09/23/2009 2:41 AM

Hi modeltruchshop,

I have found some vids which may help. Not saying they will, but something may click.

Good luck.

http://www.youtube.com/watch?v=PUnLQdiOFwI

Get back to me to continue the post.

Take care.

__________________
Take it easy, bb. >"HEAR & you FORGET<>SEE & you REMEMBER<>DO & you UNDERSTAND"<=$=|O|=$=>"Common Sense is Genius dressed in its Working Clothes"<>[Ralph Waldo Emerson]
Register to Reply
Associate

Join Date: Aug 2009
Location: Bklyn,NY; FtL, Fl; Jumet, Belguim
Posts: 40
Good Answers: 2
#3

Re: Press Brake

09/23/2009 5:56 AM

sounds like a hydrlic problem

how old is the machine

have you checked the fluid level

does it do the same in same size soft steel

test:

DO NOT MAKE ANY ADJUSTMENT DURING TEST

cut 4 pcs) .125" by 4" by 8"

Mark each piece part 1 part 2 etc

set back stop to 4"

set bend for 90 deg

use white grease pencl mark die in center

use the exact same spot on die

make bend on part 1

right after part 1 make part 2 bend

wait 5 min exactly bend part 3

wait 10 min exactly bend part 4

post or email me the results in degree for

remember to not make any adjustment during test

Part 1

Part 2

Part 3

Part 4

__________________
Complexity is only compounded simplicty :Johnny Flash 1960
Register to Reply Score 1 for Good Answer
2
Anonymous Poster
#4

Re: Press Brake

09/28/2009 2:16 AM

A few things to check on this. One is the set up method. If you are setting it up for the 90 deg bend by incrementally adjusting the ram depth and then checking the bend angle, then there will always be a difference from the pre-bent and the un-bent pcs. This leads to the second check. Make sure that your sheets don't have a curve to them (ie. they are pre-bent). If they have a curve then make sure to always run them with the curve the same side up.

Third, make sure that you aren't bottoming out the die, or similarly pinching the pc at the top of the die. This will do all kinds of weird stuff. Finally, you might need to get wider tooling. I have seen similar problems with 12 gauge mild steel using .75" die width. All of the problems were solved by going to a 1.125" die.

Register to Reply Good Answer (Score 2)
Guru

Join Date: Sep 2009
Posts: 1027
Good Answers: 86
#5

Re: Press Brake

09/28/2009 4:50 PM

Would do the drill in two phases, First fixed pressing lower than norm and according to the achieved deflection calculate the second setting for the specific material so wouldn't have to heat it or whatever. This could relatively easily be automated.

__________________
Life is complex. It has a real part and an imaginary part.
Register to Reply
2
Guru
Hobbies - DIY Welding - New Member

Join Date: Oct 2008
Location: Cairns, Qld, Australia
Posts: 957
Good Answers: 65
#6

Re: Press Brake

09/29/2009 6:24 AM

Aluminium work hardens significantly.

It is possible that your first piece work hardens because you set it up by bending to close to finish then completing the bend with another pass.

Because of the work hardening, this would mean that the next piece would be over bent.

Have you tried adjusting for the second piece, then again for the third.

This should give steadily reducing error between repeat bendings.

Hopefully, you can eventually get it fully repeatable.

Register to Reply Good Answer (Score 2)
Guru
United Kingdom - Member - Not a new member!

Join Date: Jun 2008
Location: USA/Europe
Posts: 4547
Good Answers: 68
#7
In reply to #6

Re: Press Brake

09/29/2009 12:38 PM

Hi sceptic,

Good thinking on this my friend. Perhaps annealing would help?

GA to you Sir.

Take care

__________________
Take it easy, bb. >"HEAR & you FORGET<>SEE & you REMEMBER<>DO & you UNDERSTAND"<=$=|O|=$=>"Common Sense is Genius dressed in its Working Clothes"<>[Ralph Waldo Emerson]
Register to Reply Score 1 for Off Topic
Associate

Join Date: Aug 2009
Location: Bklyn,NY; FtL, Fl; Jumet, Belguim
Posts: 40
Good Answers: 2
#8

Re: Press Brake

11/08/2009 5:29 AM

one more off the wall thought

take a multi meter

an extension cord from the meter or circuit nearest the meter

where power comes into your building

120 volt extension cord your not going to use the voltage side

you are using the ground side of the extension cord

set meter to ohms and touch different spots on the machine

and the controller

what I am looking for is sensor and reference to ground

again DO NOT USE VOLTAGE SIDE OF EXTENSION CORD OR NEUTERAL SIDE (white)

you are using the ground side of the extension cord

you are searching for leaks frequency anything on sensor side

now set the meter to volts and again do the same

you may be picking up from other equipment nearby

and your equipment can be storing or discharging a minute electrical

charge or pulse that throw off the sensors

and the second or third bend

but I still feel its hydraulic sensor / fluid problem

do you have the wiring diagrams for the machine ?

do you have the locations of the sensors and function diagrams

How old is the machine

how long have you had it

is this a problem that has always since you got the machine

has it just started

is this problem just occurring now because you just started using this material

have you used this material before with out problems

has this problem occurred in other materials

what thickness was it

have you changed the oil in this equipment

if yes

did you clean it out throughly

did you top up the oil

did you use the same brand

has the machine been service from outside

and the problem occur after

how much oil does the machine hold totally

have you been losing oil

electrical

are you at the end of the street and at the end of the power grid

what is the total electrical kWh on your last bill

do you have a delta connection

Machine electrical requirements

477 volts 3 phase ? @amps

sorry but these are the thoughts that I get into my head

from these answers I will slam you with a few more

sorry but I just want to know

its making me crazy the timing and degree thing

get back to me

please

Johnny Flash

PS

if you do not have a multi meter I can mail you one to use

if your place is on my travel route

I can stop there

I do not charge for this

I just want to know what the problem is and fix it

at 60 its not that you might not know enough

its more do I still got it

the truth is if you have a 130 ton press

what else do you have how big is your company

what do you do

what volume can you Handel

and is it in the category off what my next project needs

__________________
Complexity is only compounded simplicty :Johnny Flash 1960
Register to Reply
Guru
United Kingdom - Member - Not a new member!

Join Date: Jun 2008
Location: USA/Europe
Posts: 4547
Good Answers: 68
#9
In reply to #8

Re: Press Brake

11/08/2009 7:00 AM

Hi JF,

I think you may have forgotten one or two questions there?.............

All very useful though as they seem to be sequentially listed.

__________________
Take it easy, bb. >"HEAR & you FORGET<>SEE & you REMEMBER<>DO & you UNDERSTAND"<=$=|O|=$=>"Common Sense is Genius dressed in its Working Clothes"<>[Ralph Waldo Emerson]
Register to Reply
Guru
United Kingdom - Member - Not a new member!

Join Date: Jun 2008
Location: USA/Europe
Posts: 4547
Good Answers: 68
#10
In reply to #8

Re: Press Brake

11/08/2009 7:02 AM

Hi JF,

This sounds like it could be a good firth post on a thread which helps others sort things out? Want to start one?

__________________
Take it easy, bb. >"HEAR & you FORGET<>SEE & you REMEMBER<>DO & you UNDERSTAND"<=$=|O|=$=>"Common Sense is Genius dressed in its Working Clothes"<>[Ralph Waldo Emerson]
Register to Reply
Associate

Join Date: Aug 2009
Location: Bklyn,NY; FtL, Fl; Jumet, Belguim
Posts: 40
Good Answers: 2
#11
In reply to #10

Re: Press Brake

03/30/2010 12:28 AM

what is a firth?

__________________
Complexity is only compounded simplicty :Johnny Flash 1960
Register to Reply
Register to Reply 11 comments
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be Good Answers:

These comments received enough positive ratings to make them "good answers".

Comments rated to be "almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, rate them!
Copy to Clipboard

Users who posted comments:

Anonymous Poster (1); babybear (4); Johnny Flash (3); mike k (1); sceptic (1); SimpleMind (1)

Previous in Forum: Coffee Pots That Spill   Next in Forum: Collapsible Tube Caps and Nozzles

Advertisement