>line speed varies between 10-50(m/min)
>length of work piece 1-12(m)
>thickness of work piece between 6 - 16 (mm).

As Peter mentioned - how long does it take to shear the material?

When cutting 1m long pieces - what is your max desired line speed?

I am assuming that the shear is mounted to a carriage - how much does the carriage weigh?

Is the carriage powered? (motor? gearbox? chain drive?) etc.

 

Hi Ken,

It will be better to go for a Baldor make motion control. As I have used Baldor in our applications I feel no other product presently available to over come Baldor in Motion control products....Here is the example, you can just go through it ....Just by one command you can do the flying shear ..

http://www.baldormotion.com/solutions/solution2.asp

with regards
Denson

 

max speed is 800 rpm - the shearing time is about 500ms and i don't know how much is the carriage weighs. but the carriage is equipped with a 108 kw dc motor and a convertor (the jog speed is 20 rpm)
but dear all my problem is the calculations and i want to do the job with siemens s7(cpu315 2dp).

how should i start?
thank you

 

just one more thing:

i want to do the job without using motion control devices (just by means of s7 315 2dp). in fact they are in my 2nd priority.

 

Jack,

Given the size of your prime mover and your desire to use an S7 PLC - (and as I understand it, you already have a functioning system) - I would encourage you to seek out a Siemens Solution Partner that is well versed in Motion control using the S7 Technology PLC with integrated motion.

We have that ability here in our offices - (Vancouver, WA) - but you may be better served using a Solutions Partner in your region.

We have designed and implemented flying cut-off applications for a variety of industries and as such I don't believe that you can simply enter an equation for the move and consider it finished. There are a variety of issues related to safety, homing, recovering from faults, etc. that come into play. These issues will be well understood by a competent Systems Integrator and you would be well served to contract the services of such a company.

Best Regards,

Ken Brown
Applied Motion Systems, Inc.
www.appliedmotionsystems.com

 

RPM is not what is needed. Provide:

Line speed
Cut time
Cut Length
Shear travel distance
Mass

See this thread, post 19 and 20
http://www.plctalk.net/qanda/showthread.php?t=57122

Compare this to the motion profiles here:
http://www.baldormotion.com/solutions/solution2.asp
There is no way linear ramps are going to be able to compare with higher order polynomials for target generation. Linear ramps assume force can change instantly that that doesn't happen in reality.

If the requested data is provided I can optimize the system so that the velocities and accelerations are minimized.

 

hi again dear ken;
thank you for your help and your time.