Drop Forging for Spanners

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


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.

Contact us to discuss your requirements of Valve Spanner Manufacturing. Our experienced sales team can help you identify the options that best suit your needs.

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 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.

For more information, please visit What Are Diagonal Cutting Pliers Used For.

How are spanners manufactured?

Most types of spanner are made using the drop forging process. Steel rods are cut into short lengths, called billets, and each one is passed through an induction heating coil which uses electromagnetism to heat the metal to about degrees Celsius. The billet is placed in three dies (also known as &#;moulds&#;) in succession. The upper die drops onto the billet, forcing it into shape. The first die provides the rough shape of the spanner, the second the finished shape and the third trims the excess metal from the formed spanner. The &#;trim line&#; (the place where the two halves of the die come together) is ground down to produce a smooth surface and a hydraulic press stamps the manufacturer&#;s name and the product details into the spanner&#;s surface. If the spanner has an angled head, a machine bends the end of the spanner into shape. If the spanner has a ring or flare nut head, a vertical milling machine cuts a hole through the centre of the head ready for shaping and sizing with a broach machine. Box and spark plug spanners are not made by drop forging. They are made from steel tubing that is shaped with forming tools which push into the ends of the tube, creating the profiles. The spanners are then tempered to increase the steel&#;s strength. Tempering is a specific sequence of heating and cooling which is slightly different for each type of steel. Flare nut heads are created after tempering by cutting a small section out of the front of the head. The spanners are left in a constantly moving tub of ceramic stones and chemicals for half a day to prepare the surface of the tools for coating. Some spanners are electroplated by being dipped in a sequence of baths containing nickel and chromium solutions. Electricity passing through the spanner causes particles of metal to stick to the tool, creating a very thin layer of metal on the surface. Others are coated with black oxide by being immersed in a chemical solution which reacts with the iron in the steel, producing a covering of magnetite which protects the steel from corrosion. Spanners are also dipped in a rust inhibitor solution for extra corrosion protection. If the spanner has multiple components, they are fitted together, often by hand. For example, rivets are fitted to hold the heads of flex-head spanners in place and plastic gears, made using injection moulding, are fitted into the heads of ratchet spanners. Injection-moulded components are made in a mould into which molten plastic is pushed under pressure. Once the piece is set it can be removed and ground down to smooth it into the finished component. Fully insulated spanners are made by placing the spanner in an injection mould and injecting molten plastic into a cavity surrounding the tool so the spanner emerges with a plastic coating. Finally, each tool is tested to ensure it is strong enough to meet the manufacturer&#;s standards.