Aluminum parts
This standard is applicable to the manufacture and acceptance of pure aluminum and aluminum alloy power fittings manufactured by casting method, and power fittings manufactured by aluminum plate and aluminum tube.
1 material
The material grade of 1. 1 must meet the requirements of product drawings, and the chemical composition of pure aluminum castings should meet the requirements of GB 1 196-83 "technical conditions for remelting aluminum ingots".
The main chemical composition, mechanical properties and inspection methods of 1.2 aluminum alloy castings meet GB 1 173-86 Technical Conditions for Casting Aluminum Alloy.
1.3 According to GB3 190-82 "Chemical Composition of Aluminum and Aluminum Alloy Processed Products", aluminum pipes and aluminum plates should be made of materials with grade not lower than L3. The tensile strength of extruded aluminum pipe shall be no less than 78.4N/mm2(78.4MPa). The mechanical properties of aluminum sheet shall meet the requirements of GB3 193-82 Hot Rolled Sheet of Aluminum and Aluminum Alloy.
two dimensions
2. 1 aluminum parts shall be manufactured according to the product drawings and technical conditions approved by the specified procedures.
2.4 The casting inclination of aluminum castings is specified in JZ68-63 Casting Model Inclination. When there is no special provision in the product drawing, the dimensional deviation of the casting does not include the dimensional increase or decrease caused by the inclination of the casting. The casting inclination of castings should not affect the assembly and connection of fittings, and the mechanical strength of products should not be reduced in important parts.
2.5 The aluminum casting is of the wrong model, not connected with other parts or in contact with wires. Sand castings shall not be greater than 65438 0.2mm, metal castings shall not be greater than 0.8mm, and the staggered joint and contact parts shall not be greater than 0.5mm.. ..
3 Appearance quality
The appearance of aluminum parts is mainly visual inspection, and the cast aluminum parts can be inspected with a magnifying glass not exceeding 10 times when necessary.
3. No visible cracks are allowed on the surface of1aluminum parts.
3.2 There are no defects such as shrinkage cavity, air hole, sand hole, slag hole and flash in the important parts of aluminum castings (referring to the parts with high mechanical strength requirements marked according to the product drawings).
3.3 There shall be no defects such as sand holes, scars, lap joints and bulges at the parts where aluminum parts are in contact with wires and other parts, and at the parts where pressure pipes are in contact with molds and have corona prevention requirements.
3.4 The electric contact surface of aluminum parts is not allowed to have defects such as bumps, scratches, spots, pits, bumps, indentations, etc.
3.5 The general surface of aluminum castings is not allowed to have hole defects with a diameter greater than 4 mm and a depth exceeding 1.5 mm. ..
3.6 The depth of meat shortage caused by the cleaning and filing of cast aluminum riser is not more than 65438±0mm, and the area is not more than 5% of the surface area of cast aluminum riser; On the casting surface, the height of the final succulents shall not exceed 1 mm.
3.7 For products without corona protection requirements, there shall be regular lap joints higher than the casting surface 1mm in the non-connected and non-contact parts.
3.8 The general surfaces of plates and pipes are allowed to have local defects such as scratches, pits and pits that do not exceed the size deviation. The above is for reference only.