The reasons causing common defects and stamping

Blanking punch ( Trimming) Defect: too much burr, deformation, surface scratch, size does not conform to, little hole, and so on. ( 1) Too much burr - intensive clearance is too large or too small; Blade wear; Guidance precision is poor; Intensive location (such as different heart 2) Deformation and the pitch is too small; Pressure plate with concave surface model is bad; Clearance is too large (such as 3) Surface scratch - sometimes drag operation, pull the phenomenon such as; Sheet metal in the process of shearing scratches, etc. ( 4) Size does not conform to feeding does not reach the designated position; Position the device damage or loose, channeling move (such as 5) Little holes to punch broken; Drawing defects: cracking, wrinkling, surface strain, wave, beat, indentation, pitting, etc. ( 1) Cracking and intensive R corner radius is too small; Blank-holder force is too large; Material formability poor or size is larger; Intensive interval is too small; Improper lubrication; Positioning inaccurate; Intensive R Angle or drawbead, hair, etc. ( 2) Wrinkling and intensive R corner radius is too large; Blank-holder force is too small. Materials smaller size; Intensive gap is too big; Lubrication appetite; Positioning inaccurate; Drawbead layout, height is not enough, etc. ( 3) Work surface strain and mould surface scars; Material surface defects; Such as impurities, scraps of lubricating oil ( 4) Wave, beat, pits, pitting and blank-holder force is small; Improper lubrication, mold cavity dirty; Material surface dirty; Air holes blocked; Flanging defects: flanging is not vertical, flanging height is not consistent, flanging hair, double edge crack, etc. ( 1) Flanging is not vertical to intensive clearance is too large, 2) Flanging height is not consistent - intensive non-uniform clearance; Positioning inaccurate; No (fall with size 3) Flanging hair - edge have scars; Parts surface impurities; Blade hardness is too low, 4) Double edge crack and trimming the burr; Intensive interval is too small; Shape have mutations in flanging