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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 4679-2003 Specification of die-casting die components.
The following main editorial and technical changes have been made with respect to GB/T 4679-2003:
——The standard name is changed into three sections, namely Diecasting dies - Components - Specifications;
——Normative modifications are made to the content and structure of the standard according to the requirements of the current national standards;
——Three normative references, namely, GB/T 230.1, GB/T 231.1, and GB/T 825, are added;
——Inspection methods are added (see 4.2, 4.3, and 4.4).
This standard was proposed by and is under the jurisdiction of the National Technical Committee 33 on Die and Mould of Standardization Administration of China (SAC/TC 33).
The previous editions of this standard are as follows:
——GB/T 4679-1984 and GB/T 4679-2003.
Diecasting dies - Components - Specifications
1 Scope
This standard specifies the requirements, inspection methods, and marking, packaging and transportation of diecasting die components.
This standard is applicable to diecasting die components.
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 145 Center holes
GB/T 230.1 Metallic materials - Rockwell hardness test - Part 1: Test method (scales A, B, C, D, E, F, G, H, K, N, T)
GB/T 231.1 Metallic materials - Brinell hardness test - Part 1: Test method
GB/T 825 Eyebolts
GB/T 1184-1996 Geometrical tolerancing - Geometrical tolerances for features without individual tolerance indications
GB/T 1804-2000 General tolerances - Tolerances for linear and angular dimensions without individual tolerance indications
GB/T 4678 (all parts) Die-casting die components
GB/T 6403.5 Relief grooves for grinding wheels
3 Requirements
3.1 The limit deviation of the dimensions without individual tolerance indications in the drawings shall meet the requirements of Class m in GB/T 1804-2000, Clause 5.
3.2 The shape and position tolerances not noted in the drawings shall meet the requirements of Class H in GB/T 1184-1996, Clause 5.
3.3 The components shall be free of defects such as rust, bumps and dents.
3.4 The materials selected for die components shall meet the technical standards of corresponding designation. Materials with performance superior to those recommended in GB/T 4678 are allowed.
3.5 The components shall have uniform hardness after heat treatment and be free of cracks, decarburization or oxide spots.
3.6 The relief grooves for grinding wheels with dimension unmarked in the drawings shall meet the requirements of GB/T 6403.5.
3.7 The center holes with dimension unmarked in the drawings shall comply with GB/T 145.
3.8 The side reference plane of the die plate should be marked.
3.9 When the mass of components exceeds 15kg, lifting screw holes shall be set up, and eyebolts shall meet the requirements of GB/T 825.
3.10 All components shall be free of burr.
3.11 The chamfers without marked dimension in the drawings shall be (0.5mm~5mm)×45°.
4 Inspection rules
4.1 The components shall be inspected in accordance with GB/T 4678 and this standard.
4.2 Brinell hardness of components shall be inspected in accordance with GB/T 231.1 and Rockwell hardness in accordance with GB/T 230.1.
4.3 The dimensions of components should be measured with general measuring tools, and the shapes and positions should be measured with coordinate measuring machines.
4.4 The components with surface roughness, Ra, lower than 1.6 μm should be tested by roughness measuring instrument, and the rest shall be test by roughness sample piece comparison method (visual comparison).
Foreword i
1 Scope
2 Normative references
3 Requirements
4 Inspection rules
5 Marking, packaging and transportation
