Inspection of sheet metal parts before production, methods of material inspection and problems to be noticed during processing

Inspection and material inspection of sheet metal parts before production:

1,oil inspection

Wipe the outer covering with clean gauze.Apply oil uniformly in the same direction with a clean brush to the entire outer surface of the stamping parts.Put the oil-coated stamping parts under strong light for inspection.Put the stamping parts vertically on the orientation of the car body.With this method,it is easy to find the tiny pitting points,dent ponds and ripples on the stamping parts.

2.Visual inspection

Visual inspection is mainly used to find the abnormal appearance and microscopic defects of stamping parts.

3.Contact inspection

Wipe the outer covering with clean gauze.Depending on the inspector's experience,the inspector should wear contact gloves and make contact with the stamped parts longitually and closely with the stamped parts'appearance.If necessary,the suspected area can be polished with a whetstone and verified,but this method is a very effective method of identification.

4.Polishing flexible gauze

Wipe the outer covering with clean gauze.With the flexible sand mesh grinding the stamping parts to the whole surface,any pitting and indentation will be easily found.

5,whetstone polishing

(1)First of all,with clean gauze will cover the appearance of clean,and then grinding with whetstone,there is a circular arc of the local and difficult to reach the local with a relatively small whetstone grinding

(2)the choice of whetstone particle size depends on the appearance.Fine-grained whetstone is preferred.The direction of the whetstone grinding is basically longitudinal and fits well with the appearance of the stamping parts,and some of the local can also make up for the transverse grinding.

Problems to be noticed during the processing of sheet metal parts:

1.Scratches on the stamping parts:the reason for the scratches on the parts is that there are sharp scars on the mould or metal dust falls into the mould.The measures to avoid the scratches and metal dust on the grinding mould are to be taken.

2,the bottom of the parts cracking:the bottom of the parts cracking is caused by poor plastic data or die blanking ring pressure too tight,to avoid measures for better plastic information or to loosen the blanking ring.

3,parts side wall wrinkles:the cause of the parts side wall wrinkles is the thickness of the material is not enough(thinner than the allowed thickness)or the upper and lower die device appeared eccentric,forming a large gap on one side,the other side of the gap is small,to avoid measures for the immediate change of data and re-adjust the mold.