shot peened/forged

Mythos

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It's just been in the last year that I have taken a serious interest in atomotive/cycle mechanics.

I was doing a little reading about the updates to the G2 busa and I came across these: "shot peened conecting rods" and "forged pistons." I know what a piston and a rod is but can anyone explain what shot peened and forged means and compare how these two updated parts compare to the pistons and rods in the G1 busa?

Mythos
 
Peening a surface spreads it plastically, causing changes in the mechanical properties of the surface. Shot peening is often called for in aircraft repairs to relieve tensile stresses built up in the grinding process and replace them with beneficial compressive stresses. Depending on the part geometry, part material, shot material, shot quality, shot intensity, shot coverage, shot peening can increase fatigue life from 0%-1000%.
 
Or the short version?? it removes stress risers that can lead to catastrophic failure :)
 
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forged is what the guys putting shoes on horses do...




ok thats maybe a lie
:rofl:
 
Thanks. Sounds like peening causes the metal to become harder like when you hammer a piece of wire. How does shot come into play? I'm picturing tiny beads of metal like buckshot getting hammered against the rods.

Mythos
 
Found this about forging. Sounds like forging is a process related to peening. I imagine forged metal actually gets shaped through hammering or hydrolic press. Peening seems to be more of a surface treatment after the part is cast a/o ground.

From Wiki:

Forging results in metal that is stronger than cast or machined metal parts. This stems from the grain flow caused through forging. As the metal is pounded the grains deform to follow the shape of the part, thus the grains are unbroken throughout the part. Some modern parts take advantage of this for a high strength-to-weight ratio.
 
......and here's the answer to the "shot" question.

Shot peening is a process used to produce a compressive residual stress layer and modify mechanical properties of metals. It entails impacting a surface with shot (round metallic, glass or ceramic particles) with force sufficient to create plastic deformation. It is similar to sandblasting, except that it operates by the mechanism of plasticity rather than abrasion: each particle functions as a ball-peen hammer. In practice, this means that less material is removed by the process, and less dust created.

They actually shoot shot at the part.

I enjoy all the technical terms I'm learning. A lot of them have a very nice sound. Usually they are direct and explicit. Very utilitarian just like a machine. "Shot peened." I think I have a new favorite term.

Mythos
 
now look into cryogenic processing.. something we do on some of our high stress applications. :)
 
I use Mikroniting.

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Mikronite® is the brand name for a surface finishing process that strengthens, smoothes and polishes materials to enhance their performance.

In other words, Mikronite® improves sharpness, durability, lubricity and impact resistance while reducing friction, resistance and corrosion.

What Is The Process?
The Mikronite® process is based on a simple concept of applying lapping-like scratching under extremely high compression. Objects are placed in a fluidized medium containing an abrasive in a specially designed reverse centrifugal accelerating agitator. The medium is non-caustic and generally organic.

As the objects are revolved, they are subjected to massive G forces so that very fine particles --- as small as dust --- operate multiple times their mass and weight. To solve the problem of static revolving forces --- because centrifugal forces spin things away from the center --- the reverse centrifugal forces cause a wave-like motion creating a sinusoidal agitation.

Once accelerated, the medium slides uniformly across the object's surface with controlled and even distribution of pressure.

How Does It Work?
The Mikronite® process works by compressing the exterior surface of an object to reduce slip planes. To understand slip planes, visualize a brick wall which usually cracks along a line that looks like a staircase. This fracture line is a slip plane. By compressing or meshing those relatively straight lines, the Mikronite® process puts them in a tongue and groove or interwoven relationship.

This produces molecular-level changes to the surface of an object without changing its size, shape or metallurgy. The depth of this change can be controlled for the best blend of hardness and ductile properties. For example, it is usually desirable to make the exterior harder and leave the interior ductile so the material has the best of flexibility and strength without brittleness.

What Is The Result?
As a result, surface characteristics of an object are extremely optimized making them harder, smoother, more polished, more uniform and more corrosion resistant with higher lubricity and less friction.

What Materials Can Be Processed?
Virtually any material regardless of size or shape can be processed using the Mikronite® process, particularly ceramics (both monocrystalline and polycrystalline), metals (including those with soft or malleable surfaces such as titanium), and plastics. In addition, objects never impact the sides of the container, therefore even brittle pieces can be processed.

What Mikronite® is NOT
Mikronite® is solely a mechanical action process. It is not a coating, and it does not involve an active heat process nor caustic chemicals of any kind.
 
Mikronite® is the brand name for a surface finishing process that strengthens, smoothes and polishes materials to enhance their performance.

We used a very similar/competing process on quick change gears as well as ring and pinions on the Sprint cars. They would roll easier and built less heat on the track. I’m sure the life was extended but it is too hard to compare in a dirt track sprints.
I started to do my busa transmission when I had it out but ran out of time.
 
^^^Huh- that makes shot peening and forging look pretty archaic. This too:

Cryogenic Processing

These ultra-cold temperatures, below -310°F, will greatly increase the strength and wear life of all types of vehicle components, castings and cutting tools. In addition, other benefits include reduced maintenance, repairs and replacement of tools and components, reduced vibrations, rapid and more uniform heat dissipation, and improved conductivity. Cryogenics International's process is like an insurance policy for your tools and components.
 
We used a very similar/competing process on quick change gears as well as ring and pinions on the Sprint cars. They would roll easier and built less heat on the track. I’m sure the life was extended but it is too hard to compare in a dirt track sprints.
I started to do my busa transmission when I had it out but ran out of time.

Agreed. On some of my builds I would Mikronite the transmission,shift drum,crank,con rods,pistons and the cams.
 
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