metal stamping mold

The basic movement of blanking process is that the unloading plate first contacts and presses firmly with the sheet metal, the punch drops to contact with the sheet metal and continues to fall into the concave die.

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The basic movement of blanking process is that the unloading plate first contacts and presses firmly with the sheet metal, the punch drops to contact with the sheet metal and continues to fall into the concave die. The relative movement of the punch, concave die and sheet metal leads to the separation of the sheet metal, and then the punch and concave die separate. The unloading plate pushes the workpiece or waste material off the punch to complete the blanking movement. The movement of the discharge plate is very critical. In order to ensure the blanking quality, the movement of the discharge plate must be controlled. It must be in contact with the plate before the punch, and the pressing force must be sufficient. Otherwise, the cutting section quality of the blanking part is poor, the dimensional accuracy is low, the flatness is poor, and even the service life of the die is reduced.

The blanking and punching die is designed according to the usual method. It is often difficult to separate the workpiece from the scrap edge after stamping. On the premise of not affecting the quality of the workpiece, some protruding limit blocks can be added to the male and female die discharge plate, so that after the blanking and punching movement is completed, the female die discharge plate first pushes the workpiece out of the female die, and then the male and female die discharge plate pushes the waste from the male and female die. In this way, the workpiece and waste will be naturally separated.

For some large stamping parts with local bulges, the embossing punch can be added on the female die discharge plate of the blanking and punching die, and sufficient spring force can be applied to ensure that when the embossing punch on the discharge plate contacts the sheet metal, the material will be deformed to achieve the purpose of pressing, and then continue the blanking and punching movement, which can often reduce the die of one step and reduce the cost.
metal stamping mold
Some punching dies have a large number of punching holes, which requires a large punching pressure, which is unfavorable to the stamping production, and there is even no punch with sufficient tonnage. A simple method is to use 2 ~ 4 batches of punches with different lengths to make the punching movement time-sharing during stamping, which can effectively reduce the blanking force.

For those metal stamping parts with holes with high position accuracy requirements on the bending surface (such as the concentricity of two holes on the opposite side bending, etc.), it is difficult to meet the hole position requirements if punching first and then bending. The inclined wedge structure must be designed, and then punching after bending. The purpose can be achieved by using the punching movement in the horizontal direction. Similar structural design can also be adopted for those who have strict requirements on flanging and drawing height and need trimming process.

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