Drop Forge Hammer Product

Overview

A drop forge hammer is one of the oldest and still-effective methods of shaping hot metal through repeated impact. The process works by lifting a heavy steel block—the "tup"—and releasing it to fall onto a hot workpiece resting on an anvil. The plastic deformation of the metal under the extreme pressure and rate of loading flows the material to fill the forging dies, forming complex shapes that would be impossible to achieve by cold rolling or pressing.

The Frame & Columns is massive and heavily braced to withstand the shock loads. The Lifting Mechanism raises the hammer repeatedly using compressed air or steam. The Hammer Assembly is the striking head. The Anvil & Base absorbs recoil and is often mounted on springs for shock isolation. The Die System contains the actual shaping geometry—matching upper and lower dies that form the forging cavity. A skilled operator uses the Work Holding & Guides to reposition the hot workpiece between strikes, building up the forging shape progressively.

How it works

A forging job begins with a billet of steel (or aluminum, or other metal) heated in a furnace to 950–1100 °C—hot enough to be plastic and flow easily, but below the melting point. The billet is carried with tongs to the forge and placed on the bottom Lower Die, which sits in the anvil.

The operator starts the Control System. The Air/Steam Cylinder ports are opened, supplying 6–10 bar air to both cylinders. They extend together, lifting the Hammer Assembly—the tup with the Upper Die—to a preset height (0.5–2 m above the workpiece). After a brief hold, the Solenoid Control Valve reverses, venting the cylinders. The tup then falls under gravity plus any remaining air pressure, accelerating downward.

When the tup strikes the workpiece, the impact is violent and sudden. The drop-forge-spring supporting the anvil compresses, and the Damper Ring constrains spatter. The hot metal, under the extreme pressure and high strain rate, deforms plastically and flows into the die cavity. In a fraction of a second, the metal has filled the shape, and the tup rebounds upward on the compressed anvil springs.

The metal cools slightly during each cycle, so it needs to be reheated occasionally. The operator removes the partial forging (the "preform"), rotates it using the Manipulator Arm, and repositions it for the next strike—perhaps moving it so a different face of the die engages, or aligning it for an edging operation. The Positioning Guide helps ensure the piece returns to the same location.

Multiple strikes progressively build the forging. Early strikes are rough, using helper dies to shape the general mass. Later strikes use the Upper Die and Lower Die to form the final shape. Final finishing may include trimming away the flash (the excess metal squeezed out at the parting line) and heat treatment.

The entire process is rhythmic and loud. Hammer cycles run at 10–60 drops per minute. The strike count (how many times the tup drops per loading cycle) is adjustable via the Cycle Counter, set by the operator depending on the forging's size and complexity. After the set number of drops, the Position Sensor detects that the tup has returned to the top position and halts the cycle, waiting for the operator to reposition the workpiece.

The Frame & Columns is braced with cross-ties and mounting to a massive concrete foundation—often 30–100 times the hammer mass—to absorb the repeated shock and keep the machine from walking across the shop floor. Modern forges often integrate hydraulic manipulator arms, heating systems, and automated die-change mechanisms to increase productivity and consistency.