Knowledge Of Rubber Seal Inspection

1. What are the inspection items of rubber seals?

1) Check whether the product is clean.

2) Check whether the product has vulcanization defects;

3) Check whether the product has trimming / edge defects;

4) Check whether the product has scratch defect;

5) Check whether the products have cutting defects;

6) Check whether the product is frozen, deformed and other defects.

2. What are the defect characteristics of seal products?

1) Impurities: those that do not mix with the compound show different colors or obvious foreign matters on the product;

2) Crack: there are obvious cracks on the inner and outer surfaces or other surfaces of the product;

3) Degumming: the product compound is separated from the skeleton and cannot be bonded together;

4) Lack of material: the product has no obvious contour or some parts have no glue injection or insufficient glue injection or obvious glue flow trace;

5) Bubble: the surface of the product is obviously convex and spherical;

6) Flow mark: there are obvious lines on the surface of the product, and the surface is bright and linear;

7) Mold dirty: the surface of the product is obviously not smooth enough;

8) Mold mark: in the process of making or using the mold, the concave limit or convex of the corresponding surface of the product is caused by the bump and scratch of the mold cavity (the defects of the products with the same mold cavity are the same);

9) Scald: obvious scorch on the surface of the product;

10) Repair: button teeth appear in the trimming part, which will damage the colloid of the product itself;

11) Unilateral: the symmetrical parts are inclined, with more or less on one side, or with or without on one side. For example, the width of one side is large and the other side is small, and the wall thickness is uneven;

12) Broken car: there are obvious cutting marks on the cutting surface or the cutting edge is irregular and serrated;

13) Overflow glue: for the part of the product with exposed skeleton, the exposed part shall be covered with glue;

14) Variegation: impurities different from the color of product compound due to compound, mould, etc;

15) Coil: there is a wire ring on the surface of the product;

16) Freezing defect: the product is chipped or cracked due to freezing trimming.

3. What are the product defects?

1) Fatal defect (a): the product cannot be used and scrapped;

2) Serious defects (b): the practicability of the product is greatly reduced, the product can not be used, and the product is scrapped;

3) Light defect (c): the practicability of the product is reduced, but the use is not affected, and the product is acceptable;

4) Micro defect (d): it has no effect on the practical performance of the product. It is purely a defect caused by poor manufacturing and can be used.

4. What are the criteria for judging appearance defects?

1) In normal condition, the standard of appearance limit sealing shall be followed;

2) The product is not allowed to have degumming, cracks and other heavy defects;

3) Impurities, cracks, scalding, lack of materials, bubbles and rotten bubbles are not allowed on the working face, and there are no more than 2 mold dirt, flow marks and concave convex places less than 2mm 2 on the non working face;

4) No defects are allowed on the working face, the inner and outer lip of oil seal shall be sharp, and no axial lines are allowed on the inner and outer surface;

5) Rectangular ring, cutting surface should be flat, no burr.

Post time: Jan-27-2021