THE VSR PROCESSES

Resonant VSR

Modal Sub-Resonant VSR

Sub-Harmonic VSR

Only resonant VSR has been thorougly researched and proven - in US often Modal Sub-Resonant VSR but there is no research proving it works and some of claims are ridiculous not to mention that research is done by the company that sells the equipment, internal department.

If done corectly VSR shall be equall or better to heat treatment and in some applications ( big components) that is the only option. Another advantage is that you can stress relieve components in your workshop - time and money. I have read claims about relieving assembled vibrating screen - obviously the principle of the method is not understood correctly and instead of natural frequencies of the component, natural frequencies of the screen have been used.

Equipment you can buy in Europe for AUD 20k to 50k - principle is the same only different manufacturer.

If you need any information let me know - I was looking for a unit for our workshop some time ago. ■

Some experience I have had over the years.

1. Used to be big manufacturers used BIG OVENS to put weldments into and relax the welds prior to assembly

2. Some mfrs just RUN a TIGER TORCH FLAME over the weldments after the decks are pulled out of the manufacturing JIGS.

3. Once in QUEBEC, we actually used a SONIC relief GUN, actually pointed this device at weldments, glided over the whole piece, stress relieved and you know what??? IT WORKED.

hoping we have relieved your daily stress a bit.

George - MODERATOR ■

George

How you stress relieve your components now? - heat treatment or you considering VRS.

regards

Ziggy Gregory ■

Are shop still stress relieves thermally. ■

George

I was doing calculations on bigger size screen and the result was that 7 screens was enough to cover the cost of equipment and training when compare the cost between heat treatment and VSR. Only real costs were taken into account, no time savings. ■

Ziggy: that was very interesting info on the pay back time of only 7 screens vs old methodology.

Thankyou kindly. ■

George

There were relativelly big screens 3.0 x 6.1 Double Deck ~ 20T screens, old type Honert screens with a lot of welding with the cost of ~ AUD 22000 for equipment and flying guy from Europe to do the training I did believe that was worth it. At one stage we had to wait two weeks to have components stress relieved, with VSR you can do that the same day and you know that the procedure has been followed - you get a printout. Once we received the side plate distorted after HT about 100mm (welded stiffeners to the side plate) with critical shippment to China of 10 screens. ■

here is a link describing the process in great detail for other forum members .........

http://www.vsr-africa.com/process.htm

THANKS Ziggy. Cheers. ■

http://www.is.gliwice.pl/en/products.php

Vibratory Stabilizer SW03A

There is some interesting articles on welding here - There were some articles on Vibratory Stress Relieving - I will search for them later ■

VSR.zip - presentation of applications for weldments and casts ■

VSR.zip - presentation of applications for weldments and casts.

Another attempt

Attachments

vs_en (ZIP)

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One more article on VSR

Attachments

vibration treatment (ZIP)

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Manish: Well....What our company does is incorporate the use of big welding jigs......to ensure absolute SQUARENESS and plus minus tolerances for squareness when welding this big vibrating screen deck members.

We then actually RELAX these WELDMENTS after removing from the jigs with a TIGER TORCH METHOD or oven if not too big.

Has been working quite efficiently but, I am sure there are newer better technologies that are proven. ■

Manish

I would not say that VSR is newer technology - it has been around for quite a long time. In South Africa is being used for a long time and has been proven and researched and more and more companies in Europe jump into it.

So why the other guys don't use it? - I would say it is safer for them to do things as they have been done previously, why take the risk? The risk is minimal and financial, time and logistics advantages are quite obvious. I think you can even better control the process in your workshop then somewhere outside doing heat treatment.

George

TIGER TORCH METHOD it will work however you have no control over process and therefore that would be hit and miss. Even in the best case you can get only partial relieve. One failure in the field, that you don't have, can easily pay for VSR equipment, not to mention that quality and reliability will impact your sales. ■

Hi ziggy: Yes you are absolutely correct, but that is the method used I would say with no real ill effects.

Hit and miss......I would say that would be a correct statement.

I would embrace VSR but, not my decision....in a previous company.

Best Regards,

George ■

One more webpage with VSR

http://vsrtechnology.net ■