Knuckle Joint Press

Knuckle joint press is also known as a toggle joint press. It is a type of cold forging press machine that applies the knuckle joint action mechanism to generate the pressing force. The primary goal of a knuckle joint press is to process components or parts that are made of steel. It is ideal for operations such as coining and shearing. The advantages of using a knuckle joint press include easy shape forming, enhanced mechanical characteristics, high surface quality, increased productivity and more. One of the most important features a knuckle joint press has is the net shape forming capability; therefore, it reduces the cost of the production.

Net Shape Forming

Net shape forming is one of the key advantages that a knuckle joint press has. With this very characteristic, the production accomplished by the knuckle joint press is rather cost-effective and productive. The term ‘net shape’ refers to the final shape, or as near as possible to final, of a manufactured part. In a net shape forming process, the end result of the product does not require an additional finishing treatment or other follow-up machining operation.

In most cases, in order to manufacture an end product, several steps are included in the process. The more steps the process takes, the more labor, time, and cost it needs to complete the process. The advantage of net shape forming is that it minimizes the cost generated during the manufacturing process and is still able to provide fine quality end products.

Knuckle Joint

The knuckle joint refers to the mechanism that a knuckle joint press applies. The pressing force of the machine is directed through a knee-like knuckle joint which connects two bars. The joint serves as a lever which allows the pressing process to conduct in an efficient fashion. Yet, during the working process, the knuckle joint receives a proportional increase in force while the speed decreases. With the knee joint mechanism, only short stroke is required to perform the pressing action.

The basic components of the knuckle joint action are simple. As a result, the knuckle joint presses are available in various designs. It can be as small as a table top manually operated press machine; or it can be a fully automated console style machine which processes work pieces that weigh several tons. The machine can accommodate with multiple power systems such as hydraulic driving system or pneumatic driving system.

Short Stroke Capability

The knuckle joint presses only need short working stroke to generate powerful pressing force and the cycle time is shortened consequently. With the short stroke capability and high pressing force, applying knuckle joint presses in a manufacturing process improves the productivity immensely.


The coining process is a type of closed die forging process. In a coining operation, certain amount of pressure is exerted on specific parts of the surface of the work piece to obtain a smoother surface without drafts. A closed die forging process refers to the metal forging process where the work piece is placed between two dies. Though a closed die forging process can be either a hot forging process or a cold forging process, it is usually a cold metal forming process. The coining process is sometimes referred to as a stamping process.

The coining process is applied in applications such as manufacturing coins, medals, badges, precision electronic parts where a fine surface is needed. The advantages of coining include fine and detailed surface finish, accuracy, product consistency, and low cost. It is a manufacturing process that is mainly performed by the knuckle joint press machine and it does not require finish treatment.


Shearing is also known as die cutting. The key difference between shearing and other forms of cutting is that, no chip is generated during the process. The chips are the parts that are removed from a work piece. The formation of chips is inevitable in most cutting or drilling operations; yet, it is excluded in a shearing process. Shearing is called die cutting because the cut is not performed with cutting tools or drill bits, but dies. Shearing is ideal for cutting sheet metal or plates.

During a shearing operation, the sheet metal will be placed and secured on the bed of a press machine. Once the sheet is held in place, the ram of the press descends from above onto the sheet. When the die on the ram engages with the press bed, the metal sheet is cut into the desired configuration in accordance with the shaped dies. The knuckle joint presses are ideal for performing such operations.

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