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Blankholder

Blankholder

What is a blankholder and where is it used? Blank holders are vital elements in hydraulic press machines. Get price from the manufacturer.

A blankholder is a component of a hydraulic press used in metalforming operations that involves drawing or stretching a sheet of metal. It is a flat, circular or rectangular piece that is positioned over the blank (sheet of metal) to hold it in place as the punch descends to form the metal into the desired shape. The blankholder exerts a constant pressure on the blank to prevent it from wrinkling or tearing during the forming process.

The blankholder can be either an active or passive component. An active blankholder is designed to apply a variable pressure that changes as the forming process progresses. This can help to ensure that the metal is formed evenly and without defects. A passive blankholder, on the other hand, applies a constant pressure throughout the forming process.

The blankholder can be operated manually or automatically, depending on the design of the press and the requirements of the metalforming operation. In some cases, the blankholder may be replaced with a draw ring, which is a cylindrical component that is used to hold the metal in place during the forming process.

Blankholder in a Hydraulic Press

A blankholder in a hydraulic press is typically a plate or a set of plates that are used to hold the metal blank in place while it is being formed or shaped. The blankholder exerts a force on the blank to prevent it from wrinkling or buckling during the forming process. The blankholder is designed to be adjustable so that it can be moved closer or further away from the die as needed to achieve the desired shape and quality of the final product.

The blankholder is typically attached to the ram of the hydraulic press, which allows it to move up and down in conjunction with the movement of the die. As the die descends onto the blank, the blankholder exerts a force on the blank to keep it in place and prevent it from moving or buckling. The amount of force exerted by the blankholder can be adjusted based on the thickness and properties of the blank material.

The blankholder can also be designed to include features such as vacuum suction cups or clamps to hold the blank in place more securely. Some blankholders are designed to be adjustable in multiple dimensions, allowing them to hold irregularly shaped blanks or to accommodate changes in the shape of the blank during the forming process.

Overall, the blankholder is an important component of a hydraulic press that helps to ensure the quality and accuracy of the final product. By holding the blank in place and preventing it from moving or wrinkling during the forming process, the blankholder helps to produce consistent and high-quality parts

Blankholder of a Hydraulic Press

Blankholder is an essential component of a hydraulic press used in metalforming operations such as drawing, forming, and coining. It is used to prevent wrinkles or cracks from forming during the forming process by applying a uniform pressure to the sheet metal blank. The blankholder is typically a flat surface located above the die, and it is held in place by a hydraulic cylinder or other mechanism.

The blankholder force can be adjusted based on the thickness and type of material being formed, as well as the desired level of deformation. The force is typically set to a level that is slightly higher than the force required to overcome the friction between the blank and the die. This helps to ensure that the material is evenly distributed and that the desired shape is achieved.

The blankholder force can be applied in a number of ways, depending on the specific design of the press. In some cases, the force is applied continuously throughout the forming process, while in others it is applied intermittently. Additionally, the blankholder force can be adjusted dynamically during the forming process to compensate for variations in material thickness or other factors that may affect the quality of the finished product.

Overall, the blankholder is an important component of a hydraulic press used in metalforming operations, and its proper selection and use are critical to achieving high-quality finished products.