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Forged Hollows & Forged Hollow Parts

Solid steel bars require boring. Steel tubes frequently need excess machining. Castings often do not meet internal part strength specifications. Below are some examples of how forged hollow products have served as a customized solution for many of Scot Forge's customers—providing a stronger, high-quality product while eliminating excess time, cost and material waste.

Product/application

Piston rod

Material

Low-Alloy Steel

Piston rod

Previous processing problems

Formerly, a solid steel bar was bored, machined, heat treated, and then finish machined with a tapered inside diameter.

  • Bar size limitations, and the need to bore out the I.D. resulted in extensive material waste.
  • Excessive machining caused high costs and shortened tool life.
  • Since the I.D. was not tapered prior to heat treating, core hardness could not be achieved in that area.
Piston rod

Forging as the solution

  • Today, custom hollow forgings produce a near net shape, reducing material by 23%.
  • Less machining saves time, cost and tool life.
  • Tapered I.D. is achieved during the forging process, which allows core hardness requirements to be met during heat treating.

Product/application

Paper rollers

Material

Carbon Steel

Previous processing problems

Off-the-shelf tubing was previously used to form this part.

  • Limited available sizes often required excess machining.
  • Frequent inclusions resulted in poor surface quality and low part strength, causing internal rework and high part rejections.

Forging as the solution

  • Custom-tailored hollow forging has eliminated the need for excessive machining.
  • The combination of using cleaner material and the forging process prevents inclusions, raising part strength and quality. This has solved former internal processing problems.
Tubing

Product/application

Recoil cylinder

Material

Low-Alloy Steel

Defense hallows

Previous processing problems

A centrifugal casting with a straight I.D. and single-step O.D. was formerly used.

  • Failure to meet critical I.D. surface requirements often caused extensive welding and machining repair.
  • High rejection rates were experienced due to poor casting integrity.
  • Excessive reworking costs and failure to meet critical production deadlines were causing major problems.
Defense hallows

Forging as the solution

Today, a hollow-stepped forging is produced with an integral-stepped I.D., delivering higher value with a stronger, near-net shape.

  • Hollow forging the part with a double O.D. and I.D. produced a stronger, near-net shape at less cost.
  • Forging produces a continuous grain flow, yielding the optimum combination of fatigue strength and toughness.
  • The need for weld and machine repair is no longer required; the integrity of the forging eliminates part rejection.