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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces JB/T 5946-1991 Construction machinery - General technical conditions for painting. The following main changes have been made with respect to JB/T 5946-1991:
——The application scope of this standard has been modified (see Clause 1 hereof; Clause 1 of Edition 1991);
——Some references have been added and some have been deleted (see Clause 2 hereof; Clause 2 of Edition 1991);
——The terms and definitions have been modified (see Clause 3 hereof; Clause 3 of Edition 1991);
——The requirements for the painting varieties and colors have been modified (see 4.1 hereof; Clauses 4 and 5 of Edition 1991);
——The requirements for paint application and film quality have been modified (see 4.2 hereof; Clauses 6 and 7 of Edition 1991);
——The test methods for painting have been modified (see Clause 5 hereof; Clause 8 of Edition 1991);
——The inspection rules for painting have been modified (see Clause 6 hereof; Clause 9 of Edition 1991).
This standard was proposed by China Machinery Industry Federation.
This standard is under the jurisdiction of SAC/TC 334 National Technical Committee on Earth-moving Machine of Standardization Administration of China.
The previous edition of this standard is as follows:
——JB/T 5946-1991.
Construction machinery - General technical specifications for painting
1 Scope
This standard specifies the terms and definitions, requirements, test methods and inspection rules for the painting of construction machinery products and their parts and components.
This standard is applicable to the protective and decorative painting of the surface of construction machinery products.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 5206 Paints and varnishes - Terms and definitions
GB/T 8264 Glossary of painting terms
GB 20178 Earth-moving machinery - Machine safety labels - General principles
GB/T 28699-2012 Steel structure protection general requirements of coating
HG/T 4339-2012 Coatings for engineering machine
JB/T 5000.12-2007 Heavy mechanical general techniques and standards - Part 12: Paint
3 Terms and definitions
For the purposes of this standard, the terms and definitions given in GB/T 5206 and GB/T 8264 apply.
4 Requirements
4.1 Coating varieties and colors
4.1.1 Coating varieties
4.1.1.1 The recommended coating varieties commonly used for painting are shown in Table 1. The primer, putty, intermediate paint, top paint, oil resistant paint, high temperature resistant paint and moisture resistant paint shall be used for matching each other or according to the selection by the manufacturer. The coating system shall be selected depending on the corrosion of the service environment. If not of the same type, the selected coatings shall be well compatible with each other.
Table 1 Recommended coating varieties commonly used
Coating type Coating variety
Primer Iron red alkyd primer, iron red epoxy ester primer, zinc silicate antirust paint, zinc phosphate primer, epoxy zinc rich primer, etc.
Putty Various colors of alkyd putty, various colors of perchloroethylene putty, various colors of polyurethane putty, various colors of perchloroethylene putty, various colors of epoxy ester putty, various colors of unsaturated polyester putty, etc.
Intermediate paint Epoxy mica iron oxide paint, epoxy intermediate paint, zinc phosphate primer, etc.
Top paint Alkyd magnetic enamel, chlorinated rubber top coat, polyurethane top paint, acrylic magnetic enamel, alkyd aluminum powder paint, epoxy top paint, etc.
Oil resistant paint Vinyl perchloroethylene tank paint, epoxy-resistant paint, polychlorinated ester-resistant paint, nitro internal magnetic paint, etc.
High temperature resistant paint Inorganic zinc silicate primer, silicone heat-resistant paint, alkyd aluminum powder paint, boron barium paint of various colors, etc.
Moisture resistant paint Chlorinated rubber paint, tar epoxy asphalt antirust paint, etc.
4.1.1.2 The primer, intermediate paint and top paint in the coatings shall have property indexes meeting the requirements of Tables 1~3 in HG/T 4339-2012.
4.1.2 Painting positions and coat colors
4.1.2.1 The painting color of the external surface of any machine body shall be determined by the user requirements or design requirements.
4.1.2.2 Decorative lines or patterns with different colors may be used for machine bodies according to specific situation.
4.1.2.3 Oil resistant paint shall be applied on unprocessed internal walls of gearbox body, box cover and bearing cover as well as the unprocessed surface of parts often immersed in oil.
4.1.2.4 Components or surface shall be painted in advance if they cannot be painted as required after assembly.
4.1.2.5 The special signs on a machine, such as the manufacturer name, trademark, indicating symbols and operation instructions, shall be applied or stuck on positions of the machine with colors remarkably different with those of the signs and easily noticeable.
4.1.2.6 For the painted purchased and cooperated parts whose films have not been damaged and which do not affect the aesthetics of the complete machine after assembly, no more painting may be required. Otherwise, they shall have their painting repaired or be repainted with coatings of the same color and variety as the original coatings.
4.1.2.7 The parts and components requiring no painting are shown in Table 2.
Table 2 Parts and components requiring no painting
S.N. Type Example
1 Synthetic resin products Steering wheels, buttons, fuse boxes, vehicle lamps, etc.
2 Rubber parts Hoses, tyres, conveyor belts, etc.
3 Vinylon products Valve seats, handrails, electric wires, etc.
4 Glass parts Lamps, rear mirrors, window glass, etc.
5 Others Nameplates, steel wire ropes, batteries, etc.
4.2 Paint application
4.2.1 Application conditions
4.2.1.1 The environment requirements for paint application shall meet the requirements of GB/T 28699 and JB/T 5000.12.
4.2.1.2 The application tools shall be clean and the compressed air used for application shall be kept clean and dry.
4.2.1.3 Paint application shall be conducted in strict accordance with the requirements of temperature, moisture, repainting intervals, matching and mixing methods and precautions related to the coatings.
4.2.2 General requirements
The painting shall meet the general requirements of JB/T 5000.12-2007, 4.5.
4.2.3 Coat application
Metal coat application and paint coat application shall meet the requirements of GB/T 28699-2012, 5.4.
4.2.4 Quality requirements for films after application
The main quality indexes and requirements for films after application shall meet the requirements of GB/T 28699-2012, 5.5.
4.2.5 Other requirements
While a machine is working or moving, safety signs which are not easy to damage or detach shall be stuck on positions prone to danger according to GB 20178.
Foreword II
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements
4.1 Coating varieties and colors
4.2 Paint application
5 Test methods
6 Inspection rules
Table 1 Recommended coating varieties commonly used
Table 2 Parts and components requiring no painting
