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Drop Forging for Spanners

A spanner is a tool used to provide grip and mechanical advantage in applying torque to turn objects—usually rotary fasteners, such as nuts and bolts—or keep them from turning.

Most types of spanner are made using the drop forging process. Below are the main step to manufacture spanners by drop forging.
drop forging for spanners

Since there are so many types of wrenches, we’ll focus on the combination wrench since it’s one of the most common types of wrenches used by the public. First, a steel bar is sent into a die cutting machine which cuts the bars to a certain length. The bar lengths are then called billets.

After the billets are cut to size, a machine then feeds each billet into an induction heater in order to heat the metal and allow it to be forged into a certain shape. Once the billets are heated to a certain temperature, the dies then forge the heated metal into the shape of a wrench.

Once the wrench is forged into shape, another die machine trims the excess metal. The wrenches eventually flow down a conveyor belt and start to cool off. They’re then dumped into a pick-up box.

After the wrenches are picked up, a factory worker begins to grind off the trim lines to give the wrenches a smooth finish. Then, the wrench is inserted into a bend machine to give the box end of a wrench a 15 degree angle.

A vertical milling machine then drills a hole into the box end. A broach tool is also used to help give the wrench hole a hexagonal shape. Other wrenches go through similar methods as well. After that, the wrenches undergo a heat treatment to harden and strengthen the metal. The wrenches are then placed onto another conveyor and polished for eight hours with ceramic stones. Finally, the wrenches are inserted into a nickel solution and submerged in the liquid to protect the metal from corrosion.

Once that is finished, the wrenches are washed and polished for another eight hours until they are shining. Then, they’re ready to be shipped out.

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