What are the causes of burrs in metal stamping parts? -Hardware

In the processing of metal stamping parts, sometimes it is found that the stamping parts have some burrs of different sizes, which have a certain impact on the product quality. So what is the reason for the burrs of the metal stamping parts? The following hardware is organized and introduced for everyone. 1. Blunt cutting edge. Burrs can be produced when the cutting edge becomes blunt or gnawed. The factors that affect the blunt cutting edge are: 1. The material of the convex and concave molds and their surface treatment are poor, and the wear resistance is poor; 2. The structure of the punching die is poor, and the rigidity is poor, causing gnawing injuries; 3. The operation is not timely lubricated. Fast wear; 4. The cutting edge is not sharpened in time. Second, the gap. If the blanking gap is too large, too small or uneven, it can cause burrs. The following factors affect the gap that is too large, too small or uneven: 1. Die manufacturing errors, die parts processing that does not conform to the drawings, poor parallelism of the bottom plate, etc.; 2. Mold assembly errors, large gaps in the guiding part, and different assembly of convex and concave molds 3. The precision of the press is poor. For example, the gap of the guide rail of the press is too large, the bottom surface of the slider and the surface of the worktable are not parallel, or the stroke of the slider is not perpendicular to the press table, and the rigidity of the worktable is poor. , Deflection occurs during punching, which can cause changes in the gap; 4. Installation errors, such as the upper and lower bottom plates of the die are not cleaned during installation or the fastening method of the upper die of the large die is improperly installed, and the upper and lower die of the die are not installed concentrically ( Especially the non-guide pillar die), which causes the working part to tilt; 5. The structure of the die is unreasonable, the rigidity of the die and the working part is not enough, the punching force is unbalanced, etc.; 6. The steel plate has a large degree of curvature and the steel plate is uneven. 3. Improper blanking conditions. For example, the blank (including intermediate parts) is not in contact with the punch or die. When trimming and punching with an improper positioning relative height, the height of the part may be lower than the relative positioning height. In the cutting process, the shape of the workpiece and the shape of the cutting edge do not conform, resulting in burrs. Fourth, the workmanship of the parts is poor. Complicated shapes with convex or concave sharp corners are prone to burrs due to rapid wear. 5. The material does not conform to the process regulations. The material thickness is seriously out of tolerance or the wrong material (such as the wrong steel grade) causes the relative gap to be unreasonable and causes burrs on the part. The above content is about the causes of burrs in metal stamping parts, I believe everyone has already understood. The burrs of metal stamping parts are usually produced in sheet metal blanking. Generally speaking, it is difficult to avoid. By improving the manufacturability of the parts and improving the stamping conditions, the burrs can be avoided or reduced. Hardware Co., Ltd., a manufacturer of precision metal stamping parts with 15 years of experience. Welcome to consult: