Barber’s Friction Casting

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The unit coal train, assigned service intermodal cars, visible signs of the railroads move toward higher utilization of equipment.

Not so visible, but still very important to accomplishing more economical railroad operations is the freight car truck and its suspension system.

This is the Barber friction casting, the car's vertical shock absorber and the key component of the S2 freight car truck.

It is positioned in the pockets at the bolster ends.

Its function is to generate friction when moved against the side frames.

This model shows what occurs to a truck without friction castings.

The springs bounce wildly.

With the friction castings damping the load springs, the truck rides more smoothly.

The wedge constantly moves under pressure and must handle the heat generated by the wearing action.

As it does its job, it will eventually wear.

So the casting must be designed with a very special material to provide the desired coefficient of friction to deliver thousands of trouble -free miles.

To ensure a source for this material, standard car truck built their own foundry.

The castings might appear to be relatively simple to make, but if the casting does not have exactly the correct shape and microstructure to control friction and wear, it will not do its job.

To manufacture quality castings, we begin by measuring carefully all the elements that will be placed in the furnace to ensure a known mix.

Once the individual ingredients are precisely weighed, then they can be transferred to the furnace.

These are the cores that will form the internal shape of the friction casting.

The friction casting is shaped in a green sand mold.

Here the cores are set into the mold.

Each The green sand is a mixture of many compacting materials and must be constantly monitored for moldability in our sandblast.

The molds are now ready.

The metal has been melted and is up to temperature.

Before we pour, we always test the molten material for the iron's composition.

An emission spectrometer analyzes the chemical relationships of 16 elements.

Exact control of carbon and sulfur are very important.

We make an additional analysis with a LECO tester.

These The rate of cooling is critically important.

It must be exactly controlled.

The mold travels down a conveyor belt, slowly cooling at a predetermined rate.

The cooling time and rates are very important to establish the correct microstructure.

When the castings reach a specified temperature, they are removed from the sand molds.

Cooling then continues at an accelerated rate.

The job doesn't end here with a clean casting.

Each piece is visually inspected and separated from returns.

Each casting is precision ground to our specifications.

After grinding, every casting is once again inspected.

We use a Burnell hardness tester to check for the casting's consistency.

If any piece does not fall within the limits, that lot can be investigated completely since every casting has an identification number showing the time, day, month, year that part was cast.

Every casting also bears a part number.

At the end of each furnace heat, we scrap one casting to examine it closely under a microscope.

We mount a section to inspect the microstructure.

Every casting should look like this.

We photograph the results and permanently file the sample.

We also manage a long -term evaluative program for improving our products.

A drop test determines the casting's design strength.

This wear test machine confirms the friction and wear characteristics of our material.

When a product leaves our facilities, we know it is produced and engineered to perform.

The friction casting is the heartbeat of the Barber Stabilized Truck.

Easily assembled, the S2 truck will provide load -sensitive damping with lower maintenance than ever before.

The S2 truck is ready to roll under your car.

Barber, a symbol of quality.

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