This standard specifies the technical requirements, test methods, inspection rules, etc. for the painting of light industrial machinery products. This standard applies to the painting of light industrial machinery products (hereinafter referred to as "products"). QB/T 1588.4-1993 General Technical Conditions for Painting of Light Industrial Machinery QB/T1588.4-1993 Standard download decompression password: www.bzxz.net

Light Industry Industry Standard of the People's Republic of China
Light Industry Machinery
General Technical Conditions for Painting
1 Subject Content and Scope of Application
This standard specifies the technical requirements, test methods, inspection rules, etc. for painting of light industry machinery products. This standard applies to the painting of light industrial machinery products (hereinafter referred to as "products"). 2 Reference standards
GB/T1720 Determination of paint film adhesion
GB/T 1727
GB/T 1728
GB/T 1729
GB/T 1732
GB/T 1733
GB/T 1734
GB/T1739
GB/T1740
GB/T1743
GB/T1766
GB/T 1767
GB/T 1771
GB2893
General preparation method for paint film
Determination method for drying time of paint film and putty film
Determination method for color and appearance of paint film
Determination method for impact resistance of paint film
Determination method for water resistance of paint film
Determination method for gasoline resistance of paint film
Determination method for oil resistance of insulating paint film
Determination method for moisture and heat resistance of paint film
Determination method for gloss of paint film
Rating method for weather resistance of paint filmbzxZ.net
Determination method for weather resistance of paint film
Determination method for salt spray resistance of paint film
Safety color
GB/T 3181
GB/T 5226
GB/T 6739
GB/T 9439
3 Technical requirements
3.1 Basic requirements
Standard sample of paint film color
General technical conditions for machine tool electrical equipment
Paint film hardness pencil test method
Gray cast iron parts
3.1.1 The thickness of the paint on the product should be even, and there should be no missing paint or wrong paint. 3.1.2 The painted surface should be flat and smooth, and the color and gloss should be even and consistent. QB/T 1588.4--1993
3.1.3 The gloss of the main painted surface of small and medium-sized products shall not be less than 75%; the gloss of the main painted surface of heavy (large) products shall generally not be less than 70%. If artistic paint is used, the pattern should be uniform and the paint film should be full. The surface of the hammered paint should be clear and uniform. 3.1.4 The paint film surface must be clean, free of obvious particles and adhesions, and must not have obvious protrusions, depressions, unevenness, and sandpaper marks. It must not have sagging, bubbling, Whitening, condensation and obvious orange peel phenomenon. Q/T1588.4---1993
3.1.5 The paint layer on the assembly surface of the parts must be firm, the boundaries should be neat and phased, the corners should be clear and neat, and the paint of different colors should not be contaminated with each other, without falling off and cracking. 3.1.6 The paint film should be water-resistant, impact-resistant, and oil-resistant, and should meet the requirements of the product working environment. The paint film should be weather-resistant. According to GB/T1766, its gloss loss should not be lower than level 3, discoloration should not be lower than level 3, powdering should not be lower than level 3, food grains, blistering, rust, and shedding should not be lower than level 1, and long-term profit should not be lower than level 3. 3.1.7 The paint film should be firm and reliable, and its adhesion should not be lower than level 2 specified in GB/T1720. 3.1.8 The paint film should have a certain hardness, which should not be lower than level H specified in GB/T6739. 3.1.9 The working environment should have heat resistance for the paint film. For products with salt spray resistance requirements, the requirements should not be lower than level 2 according to GB/T1740 and CE/T1771.
3.1.10 The painted products must be packaged after the paint film is actually dried. 3.2 Painting requirements
3.2.1 The surface of the casting should be cleaned before painting, and there should be no burrs, scale, rust, sand, scars, oil stains, etc. 3.2.2 The surface of the casting should be flat before painting, and it should comply with the provisions of GB/T9439. The flatness of the non-machined surface should not be greater than 4mm in any 600mm length, and there should be no obvious seams or protrusions or depressions outside the requirements of the drawings. 3.2.3 The external machined surfaces of castings, forgings, stampings, riveted parts, etc. should be treated by flash sand, pickling or phosphating. Other methods can be used to treat their surfaces according to the specific conditions of the parts. 3.2.4 If the surface of the product is rusted due to improper storage or too long storage, the surface treatment should be repeated. 3.2.5 The treated surface should be primed in time, and the primer should be applied evenly without missing any part of the surface and the surface should not be soiled. 3.2.6 The painting environment should be clean, and the relative humidity of the ambient air should not be greater than 80%. 3.2.7 The local depressions on the surface of the casting should be filled and leveled with thixotropic poly putty with a resistance to engine oil of not less than 8 or chemical curing putty at room temperature.
3.2.8 The putty should be applied in several times, and each application should be thin, and should be firmly attached to the previous application, and should not fall off. The application should be done after the previous putty is dry, and the surface should be leveled. The surface should not shrink, crack or fall off after drying. 3.3 Paint material requirements
3.3.1 Paint materials should be scientific and reasonable, such as topcoat, putty, primer, two-coat primer and thinner, which must be matched and in accordance with the relevant technical documents. Paint materials can only be selected after they have passed the inspection. 3.3.2 The paint should be self-drying. The surface drying time of primer, two-coat primer and topcoat should not exceed 0.5h, the actual drying time should not exceed 2h, and the actual drying time of putty should not exceed 4h. The topcoat material should have good protective and decorative properties. 3.4 Paint color requirements
3.4.1 The paint color of each part of the product exterior should be beautiful and generous, with harmonious and even color, smooth and pleasant color. The whole machine can be single or multi-color, and can also be determined by negotiation according to the order. 3.4.2 Colors are recommended to use apple green and cream according to GB/T3181. Red is generally not used for medium green gray except for warning. For obviously unsafe parts, orange and yellow stripes with color patterns shall be used. For some parts with special safety requirements, they shall comply with the relevant provisions of GB2893.
3.4.3 The color of the inner cavity of the product shall be slightly lighter than the outer color. The inner wall of the oil tank shall be light-colored. The parts such as the electrical box shall comply with the provisions of GB/T5226.
Test method
4.1 The primer, putty and scraping process shall comply with the provisions of relevant standards and technical documents, and quality inspection records shall be available. The paint film samples shall be prepared in accordance with the provisions of GB/T1727 and the quantity required for the paint film performance inspection. The color appearance shall be tested in accordance with the provisions of GB/T1729. 4.2 The surface gloss of the paint film shall be inspected in accordance with the provisions of GB/T1743 and in accordance with the provisions of 3.1.3. 4.3 The adhesion of the paint layer shall be inspected in accordance with the provisions of GB/T1720 and shall comply with the provisions of 3.1.7. 25
QB/T1588.4—1993
4.4 The resistance to moisture and heat and salt spray of the paint layer shall be tested in accordance with the provisions of GB/T1740 and GB/T1771, and shall comply with the provisions of Article 3.1.9.
4.5 The surface hardness of the paint layer shall be tested in accordance with the provisions of GB/T6739, and shall comply with the provisions of Article 3.1.8. 4.6 The paint film shall be tested in accordance with the provisions of GB/T1743 and GB/T1733, GB/T1739, GB/T1732 or product standards, and shall comply with the provisions of Article 3.1.6.
4.7 The weather resistance shall be tested in accordance with the provisions of GB/T1767, and shall comply with the provisions of Article 3.1.6. 4.8 The drying time of the paint film and putty film shall be tested in accordance with the provisions of GB/T1728, and shall comply with the provisions of Articles 3.1.10 and 3.3.2. 5 Inspection rules
Product paint quality inspection is divided into factory inspection and type inspection. If necessary, quantitative items can be recorded in the factory certificate. 5.1 Factory inspection should include the provisions of 3.1.1 to 3.1.5. 5.2 Type inspection should include the provisions of 3.1.1 to 3.1.9 and 3.2 to 3.4. Users should conduct type inspection when one of the following situations occurs while complying with the installation and use rules and reasonable transportation conditions. When the paint layer of the product falls off or changes color during the six months of storage; b.
When the paint layer on the surface of the product is severely cracked, peeled, rusted, discolored, or lost gloss within half a year after the product is put into operation; when the paint layer and the base putty fall off naturally during reasonable transportation; when the factory inspection results are significantly different from the last type inspection; when the color, material, and process of the product surface paint have changed significantly; when the national quality supervision agency proposes a type inspection requirement. Additional notes:
This standard is proposed by the Technical Equipment Department of the Ministry of Light Industry. This standard is under the jurisdiction of the National Light Industry Machinery Standardization Center. This standard was drafted by the Hangzhou Light Industry Machinery Design Institute of the Ministry of Light Industry and the Light Industry College. The main drafters of this standard are Lang Huiqin, Xu Quansheng, Li Hui, and Fan Fugou. From the date of implementation of this standard, the former Ministry of Light Industry standard QB/T842.7-1982 "General Technical Conditions for Light Industry Machinery Scales and Oil Paints" will be invalidated.
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.