Chengdu riveting and welding process acceptance standard, phosphating process inspection standard introduction:

1. Strictly according to the phosphating process parameters for monitoring, find problems timely feedback;

2. Before phosphating, degreasing treatment must be carried out on the greasy parts;

3. The surface of parts after phosphating shall be free of oil and rust (a small amount of ash is allowed), otherwise it must be re phosphated;

4. The appearance of phosphating film is even and fine, which is dark gray or light gray;

5. There should be no bumping and deformation in the phosphating process of parts, otherwise it must be repaired before it can be turned down;

6. Test the adhesion: draw a parallel scratch with a distance of 1 mm or 2 mm on the surface of the workpiece, draw 25-100 squares, remove the surface chips, then paste the tape on the scratch, pull the tape by hand to check whether there is phosphating film on the tape, if there is such a phenomenon, it must be reworked.

Inspection standard for putty and spray paint

1、 Batching: all the parts with unevenness or defects on the outer surface of the workpiece shall be repaired with putty to check whether there is leakage;

2、 Grinding:

1. After grinding, there shall be no obvious putty mark on the surface of the workpiece. If you touch it by hand, it shall feel smooth and the corner of the workpiece shall not be missed;

2. The parts with high requirements, such as the cab, must be polished with water sand, and * there is no obvious sandpaper mark on the surface.

3、 Painting:

1. The color must be consistent with the color plate required in the drawing;

2. Before painting, clean the rust, dust and dirt on the surface of the workpiece before painting;

3. No pinholes, impurity spots, bottom leakage, obvious uneven thickness, flow marks, poor pretreatment, oil rust, stains, unsmooth, uneven, orange peel, flower spots, etc. are allowed in the appearance;

4. 99.9% of the painting quality of workpiece surface is required to be inspected (self inspection by employees); 5% of each batch of workpiece is randomly inspected by quality inspectors; 99.9% of important parts, such as cab, are inspected;

5. For cross color painting, the dividing line must be clear and straight;

6. The surface of the workpiece shall be free of massive putty marks;

7. The thickness of paint layer shall be in accordance with the process requirements.

8. Test the adhesion: draw a parallel scratch with a distance of 1 mm or 2 mm on the surface of the workpiece, draw 25-100 squares, remove the surface chips, then paste the tape on the scratch, pull the tape by hand to check whether there is paint sticking on the tape, if there is such a phenomenon, it must be reworked.