Share the related matters of metal stamping parts
What is fine blanking: Fine blanking is attributed to non-cutting processing skills, which is a fine blanking technique developed on the basis of ordinary stamping skills. The effect of this processing technique is that the punching surface of the punching part has no cracks and tears on its entire thickness. In addition, it can also reach strict standard accuracy and flatness.
Processing characteristics of Changzhou stamping parts: The layout of the fine blanking die is opposite to that of ordinary blanking. The die layout has an additional ring gear pressing plate and ejector, and the convex and concave molds are extremely small, and the concave die has rounded edges. The blanking process Among them, before the punch contacts the material, the ring gear pressing plate is used to press the material on the female mold by force, and then lateral pressure is generated on the inner surface of the V-shaped tooth to prevent the material from tearing in the shear zone and the lateral behavior of the metal.
When the blanking punch is pressed into the material, the back pressure of the ejector is used to compress the material. In addition, the application of a very small open space and a concave die edge with rounded corners eliminates the stress concentration, and then makes the shear zone The metal is in a three-dimensional compressive stress environment, which eliminates the tensile stress in the area, improves the plasticity of the material, and avoids the tortuous, stretched, and torn signs in ordinary blanking.
The material is punched into parts along the edge style of the die with pure shearing techniques, and then high-quality light and smooth cutting surfaces are obtained. During fine blanking, the pressing force, the blanking area and the die are punched out. The rounded corners of the cutting edge complement each other, and none of them are missing. Their influence is entwined with each other. When the open space is well-proportioned and the fillet radius is appropriate, the processing of metal stamping parts can obtain a bright section with a small pressing material.
The stamping parts are formed in the progressive die by punching the remaining material around the Changzhou stamping parts to form the shape of the stamping parts. The main reason for the overturning and distortion of stamping parts is the influence of punching force. During blanking, due to the existence of blanking gaps, the material is stretched on one side of the die (the material is warped upwards), and contracted on the side of the punch. When using the unloading board, use the unloading board to compress the material.
In order to prevent the material on the side of the cavity from warping upwards, at this time, the force state of the material changes in response. As the discharge plate increases its pressing force, the material on the side of the punch is stretched (the shrinking force tends to decrease), and the material on the concave mold surface is compressed (the tensile force tends to decrease). The overturn of the stamping part is caused by the stretching of the material on the die surface. Therefore, when punching, pressing and pressing the material is the key to avoiding the turning and distortion of the punching parts.
Why does the processing of metal stamping parts appear to be distorted? How to deal with it? The reasons for the turning and distortion of the stamping parts and the method of disposal: the burrs of the stamping parts occurred during the blanking process. Need to study the cutting edge, and pay attention to check whether the blanking gap is reasonable, the blanking has already occurred during the blanking, distortion and deformation, resulting in poor forming after bending, need to be punished from the blanking station.