GB/T 15116-2023Die casting copper alloys and copper alloys die castings (English PDF)

5.4 Weight

When the purchaser has requirements for weight tolerance, the weight tolerance shall comply with the provisions of MT6~MT8 in GB/T 11351-2017.

5.5 Surface quality of copper alloy die castings

5.5.1 The surface roughness of copper alloy die castings shall be in accordance with the drawing requirements, and the unmarked parts shall comply with the provisions of GB/T 6060.1.

5.5.2 Copper alloy die castings are not allowed to have cracks, misrun, porosity, blowholes, or any penetrating defects visible to the naked eye.

5.5.3 Copper alloy die castings are allowed to have defects such as scratches, depression, poured short, and veining, but the type, degree, and quantity of the defects shall be agreed upon between the supplier and the purchaser.

5.5.4 The gates, joint flashes, overflow ports, burs, ejector pin traces, etc. of copper alloy die castings shall be cleaned, but traces are allowed to remain.

5.5.5 If there are no special provisions in the drawings, the positions that are related to the settings of die casting processes (such as the position of the ejector pin, the position of the parting line, the position of the gate and the overflow port) and can be removed by machining in the post-procedures are determined by the supplier himself. If they cannot be removed by machining or other methods in the post-procedures, they shall be agreed upon between the supplier and the buyer.

5.6 Internal quality

5.6.1 When there are requirements for the air tightness, hydraulic tightness, internal defects and items not listed in this document (including X-ray photos, non-destructive testing, industrial CT, pressure-resistant test, and casting section) of copper alloy die castings, they shall comply with buyer's technical requirements or agreements.

5.6.2 Under the condition that the use of the castings is not affected, the supplier may impregnate and repair the castings with the consent of the purchaser.

6.1 Chemical composition

6.1.1 The chemical composition inspection shall be carried out in accordance with the provisions of GB/T 5121.1, GB/T 5121.3, GB/T 5121.5, GB/T 5121.7, GB/T 5121.9~5121.14, GB/T 5121.23; under the condition of ensuring the analysis accuracy, it is allowed to use other methods; the chemical composition shall meet the requirements in Table 1.

6.1.2 The chemical composition test is allowed to analyze the main components, and carry out random inspection of impurities according to the requirements of the buyer.

6.2 Mechanical properties

6.2.1 The tensile test shall be carried out in accordance with the provisions of GB/T 228.1.

6.2.2 The Brinell hardness test shall be carried out in accordance with the provisions of GB/T 231.1.

6.2.3 Sample preparation shall be carried out in accordance with the provisions of GB/T 13822. When a test specimen cut from casting is used, the technical requirements such as sampling position and sample specifications shall be agreed upon by both parties.

6.3 Dimensions and their tolerances

6.3.1 The geometric dimension inspection of copper alloy die castings shall be carried out in accordance with the provisions of GB/T 3177.

6.3.2 The geometric tolerance inspection of copper alloy die castings shall be carried out in accordance with the provisions of GB/T 1958.

6.3.3 When the accuracy is satisfied, general or special measuring tools can be used for inspection.

6.4 Weight

During mass production, no less than 10 products are randomly selected from the first batch of qualified products jointly identified by both the supplier and the buyer, and the average value of the actual weighed weights is used as the nominal weight.

6.5 Surface quality

6.5.1 The surface quality of copper alloy die castings shall be inspected visually or by other appropriate methods. […]