1. purposes: to ensure that the quality of the company is in conformity with the specifications of the company and to reduce the bad rate of the quality of the process, the standard of this inspection is formulated as the standard basis for the inspection, and the quality of the parts, semi finished products and finished products will be tested to ensure the quality.
2. scope: all the scaffold products (metal / plastic) parts manufactured by our company belong to them, and the quality of the inspection items should be determined quickly.
3.1 definition of bad defect
Point defect: a defect with a point shape. When measuring dimensions, it is based on its * * diameter.
Shadow: the color appearing on the surface of the spray paint or plastic part is darker than that of the surrounding area.
Orange pattern: large and small shape like orange peel on the surface of spray paint or electroplated parts.
Exposed material: partial paint layer on the surface of the spray paint is too thin to reveal the color of the substrate.
Fisheye: due to the discomfort of solvent evaporation, there are dents or pits on the surface of the spray paint.
Woolen: fibrous hairs formed inside the paint itself or on the surface of the paint when the paint is not dry.
Chromatic aberration: the color difference between the product surface and the standard sample (customer recognition sample) is called chromatic aberration.
Multi glue point: local small plastic bumps due to the damage of the reverse side of the mold.
Shrinkage: when the plastic melt passes through a thin section, the pressure is lost very much. It is difficult to keep high pressure to fill the pits formed in the thicker section.
Bright spot: for non glossy plastic parts, due to uneven thickness, a localized shiny phenomenon occurs at thick wall mutations. It is felt that scratches are caused by the friction of hard objects. A scratch without a deep wound.
Burr: plastic waste edge produced at the edge or parting surface of plastic parts due to injection parameters or mold.
Melt wiring: when the plastic melt is flowing in the cavity, the melt can not be well fused after the obstacles (such as the core and other objects), and then a clear line is formed on the surface of the plastic part, called the melting connection.
Bending: plane deformation caused by internal stress of plastic parts.
Top White / top convex: due to the high packing force of the plastic, the ejector rod area is subjected to the white print or bump generated by the front top output.
Lack of material: because of insufficient injection pressure or poor mold cavity, the melt resin can not reach the corner of the mold cavity, resulting in insufficient material.
Crazing: silver white stripes on the surface of plastic parts along the direction of resin flow.
Flush pattern: the product surface takes the gate as the center and presents the annual ring like stripe.
Scorch: localized coking of plastics on the surface of plastic parts.
Towing: due to excessive injection pressure or cavity is not smooth, the edge of the mold caused by scraping.
Cracking: rubber parts are cracked on the surface due to environmental aging.
Nozzle: the end part of the gating system for plastic forming parts.
Rainbow phenomenon: refers to the phenomenon of transparent halo in transparent areas under the condition of reflection.
Poor transparency: vague and poorly transparent areas.
Pull white: when forming the pint mold, the whitening of a part is caused by the pressure of the hook bar is greater than the expected output force of the rod.
Crease: folding marks on the bottom film of PC film keypad.
Side wrinkle: when plastic is inserted into the PC film, the film is wrinkled due to the uneven force of the film.
Light leakage: there is a spot of leakage on the PC film, causing the light to be worn from the back to the front side, which is called the light leakage.
Clearance: gaps caused by improper coordination between parts due to tolerances.
Segment difference: the upper and lower parts should be smoothly connected in the same plane or curved surface, but due to the errors in the manufacturing process, they will produce different faces before or after.
3.2 grade division standard:
Level a: the outer surface that is often seen after the assembly, such as the back of the QH-1200B/1200A/1200C, the suction hood and the circle of the small sun, the sides of the panel of the QH-1200B, the ordinary people can see the top surface and do not need to bend the waist to see the bottom surface.
B level: a surface that is not often seen, but can be seen under certain conditions. For example, the inner accessories, stiffeners, the inner side of the left and right sides of the QH-1200F can be seen after opening.
C level: a surface that can not be seen or can only be seen in the assembly process. Such as the contact surface of the bottom and the base.
3.2.1 test condition
A visual distance: A-level is 300mm, B level is 500mm, C level is 1000 mm.
3.2.2 test standard
The grade surface of the product is distinguished according to the standard of light source. All grade surface coating should have no defects such as base material and peeling. All the surfaces should have no scratches, blister, wrinkle, pinhole, powder and so on.
At the standard level of eye distance level, scan with 3m/min speed scan.