GB/T 4678.2-2017
Diecasting dies—Components—Part 2: Round inserts (English Version)
- Standard No.
- GB/T 4678.2-2017
- Language
- Chinese, Available in English version
- Release Date
- 2017
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Latest
- GB/T 4678.2-2017
- Replace
- GB/T 4678.2-2003
- Scope
- This part of GB/T 4678 specifies the structural type and dimensions, requirements, materials and markings of circular inserts for die casting moulds. This part is applicable to circular inserts for die casting moulds.
- Introduction
Foreword and Standard Background
GB/T 4678 "Die Casting Parts" is divided into 19 parts, of which Part 2 specifies the structure, dimensions and requirements of circular inserts in detail. This update replaces the 2003 version. The main revisions include the application of the three-part nomenclature, the unification of the surface roughness value to $R a0.8\mu\mathrm{m}$, and the expansion of the size range and material selection.
Comparative analysis of standard frameworks
Standard dimensions GB/T 4678.2—2017 GB/T 4678.2—2003 DIN 53922 ISO 23903 Structural type Uniform specifications, clear illustration requirements Relatively simple Rich in details Modular design Size range Covering D=30~600mm, H=20~800mm D=30~400mm, H=15~700mm DIN standard: D=20~500mm ISO standard: D=25~600mm Surface roughness $R a0.8\mu\mathrm{m}$ $Ra1.6\mu\mathrm{m}$ $Ra1.2\mu\mathrm{m}$ $Ra0.8\mu\mathrm{m}$
Detailed explanation of technical requirements
Dimension and tolerance control
The limit deviation of the circular insert diameter $D$ follows the h7 specification in GB/T1801-2009, and the verticality and parallelism tolerance level is level 5. Table 1 lists the available thickness ranges for different diameters in detail, and it is recommended to use the size marked with '×' to ensure the best performance.
Material selection and hardness requirements
Material grade Recommended hardness (HRC) Applicable die casting alloy 4Cr5MoSiV1, 4Cr5MoSiV 44~48 HRC Zinc alloy, aluminum alloy, magnesium alloy - 38~42 HRC Copper alloy
Implementation suggestions and application cases
When selecting round inserts:
- Select the material grade with appropriate hardness according to the material characteristics of the die casting
- Preferably use the standard recommended dimensions to ensure interchangeability and processing convenience
- Strictly control the surface roughness and tolerance requirements to ensure the life of the mold and the quality of the product
In actual applications, it is recommended that manufacturers refer to Table 2 for material matching and combine the technical conditions of GB/T4679 to ensure processing quality. Pay special attention to the verticality and parallelism control in the thickness direction, which is crucial to the molding accuracy of die castings.
GB/T 4678.2-2017 Referenced Document
- GB/T 1184-1996 Geometrical tolerancing--Geometrical tolerance for features without individual tolerance indications
- GB/T 1801-2009 Gemetrical Product Specifications(GPS).Limits and fits.Selection of tolerance zones and fits
- GB/T 4679 Diecasting dies—Components—Specifications
GB/T 4678.2-2017 history
- 2017 GB/T 4678.2-2017 Diecasting dies—Components—Part 2: Round inserts
- 2003 GB/T 4678.2-2003 Die-casting die components--Part 2: Round insert block
- 0000年 GB/T 4678.2-1984