Q: We have an application where we need to stake two assembled parts shown in the picture below (bronze part press fitted inside SS part).

The stake mark shown is approx. 1.6 x 3 mm in size and it was made with a hydraulic press using a 2.5 inch diameter cylinder and running a minimum pressure of 62 bar (force of approximately 4415 lbs).

 

We would like to know if one of your part marking tools could perform this operation yielding similar results as shown.

A: The surface area you are indenting consists of two different metals making this  a bit of a challenge to determine the exact force.

I will guess the SS material is a 400 series which is tougher and more resilient to impact than a 300 series stainless.

If it is 300 series S.S. then we can reduce the forces by about 10%

Estimating squeeze force into impact force can be tricky as the time for the molecules to move and form is part of the calculation (Faster near instant, like in impact requires force as well).

Rule of the thumb;  add 20% for impact over time delayed static press force.

 

Your area equals the force of approximately 4 1/8” (3mm) stamp characters.

The pre-loading and infinite rod orientation adjustment of the SLIDE-A-Mark series fits your application perfect.

Also the SLIDE-A-MARK series will advance to the part-preload the part with about 18# of force and then follow through with the impact force needed.

 

I have listed 2 models that should work very well for you.

Some quick features.

1. The larger 651 is more robust and still has a low enough top force to fit will into your power requirement and has a wide range of rod end styles
2. The 451 also is a very well-made unit and is approximately  30% in overall size.
3. Very fast, total ADVANCE-STAKE-RETURN on either the 2.5” stroke up to the 4.0” stroke markers only takes 1 second or less.
4. Will automatically adjust tool to part distance [anywhere in stroke range the impact force is the same].
5. Mounting bolts see less than 50# of force as the high power impact force is captivated internally.
6. Keyed non rotating rod.
7. Adjustable radial rod orientation (takes less than 1 minute to adjust).
8. Optional return and advance switches.

 

Simple To install, only requiring  4 bolts and 2 air lines and we also offer a proper CV air sized valve package for this if you desire.

I strongly suggest it as it has a single solenoid valve and an air timer for returning the unit because it happens so fast typical PLC and double solenoid valves cannot react as fast and tend to cause a double impact as the marker is returning before the air valve can change direction.

 

The PSI below that I am indicating here are only suggestions, but should be good starting points (adjust higher for more depth and lower for shallower)

500# to 4 ton force

Model 451 @ 70-80psi (5.5 bar)

600# to 6 ton force

Model 651 @ 30-40 psi (2.5 bar) Note the 651 is not shown on our website, but is identical to the 751/851 in all dimensions

 

They come in different rod styles and you can get holders for them as well.

We can make a special holder for your current stake tool if you give us a sample or drawing.

 

Here are some helpful links.

• 451 http://www.columbiamt.com/CMT-Impact-Marking/Slide-A-Mark-4-Ton.html
• 651 http://www.columbiamt.com/CMT-Impact-Marking/Slide-A-Mark-8-and-10-Ton.html 651 not shown but same dimensionally as 751 but only has 6 ton impact.
• Valve Package http://www.columbiamt.com/CMT-Impact-Marking/Valve-Packs.html

 Q: We have an application where we need to stake two assembled parts shown in the picture below (bronze part press fitted inside SS part).

The stake mark shown is approx. 1.6 x 3 mm in size and it was made with a hydraulic press using a 2.5 inch diameter cylinder and running a minimum pressure of 62 bar (force of approximately 4415 lbs).