GB/T 40809-2021Casting aluminum alloys—Process specification for semisolid rheo-diecasting forming (English PDF)
铸造铝合金 半固态流变压铸成形工艺规范
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
October 11, 2021
Implementation date
May 1, 2022
Scope
GB/T 40809-2021 is the English-translated version of 铸造铝合金 半固态流变压铸成形工艺规范.
GB/T 40809-2021 sets the process rules for semi-solid rheo-diecasting of cast aluminium alloys, in which a slurry of non-dendritic primary solid phase suspended in the melt is transferred to die-casting equipment and formed into a part in one operation.
It covers the whole process flow: raw and auxiliary materials, charge make-up and melting, melt treatment, ladling, preparation of high and low solid fraction slurries, slurry transfer, rheo-diecasting, casting inspection and heat treatment.
It defines terms such as semi-solid rheological slurry, rheological diecasting forming, solid fraction and low solid fraction slurry. It draws on the standards for cast aluminium alloys, aluminium alloy castings and die castings, tensile testing and online degassing of aluminium melts. It was issued on 11 October 2021 and has applied since 1 May 2022.
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Document preview — GB/T 40809-2021
National Standard of the People's Republic of China
- ICS
- 77.120.10
- Classification
- J 31
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.
1 Scope
This document specifies the process flow, raw and auxiliary materials, ingredients and melting, melt treatment, and extraction of cast aluminum alloy semi-solid rheological die casting.
Material, high/low solid phase slurry preparation, slurry transfer, rheological die casting, casting inspection and heat treatment.
This document is applicable to the semi-solid rheological die casting forming process of cast aluminum alloy.
2 Normative references
The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.
GB/T 228.1 Tensile Test of Metallic Materials Part 1: Room Temperature Test Method
GB/T 1173 Cast aluminum alloy
GB/T 5611 Casting Terminology
GB/T 9438 Aluminum alloy castings
GB/T 9452 Method for measuring effective heating zone of heat treatment furnace
GB/T 15114 Aluminum alloy die casting
YS/T 601 Aluminum Melt On-line Degassing Purification Process Specification
3 Terms and definitions
The following terms and definitions defined in GB/T 5611 apply to this document.
3.1 Semisolid rheological slurry
The metal melt in the solidification process is processed by applying physical or chemical technical means to obtain a uniform metal melt.
A solid-liquid mixture in which a certain proportion of non-dendritic primary solid phases (mainly spherulites or near spherulites) are suspended.
3.2 Rheological diecasting forming
The semi-solid rheological slurry is transferred to the die-casting forming equipment, and the forming method of the part is obtained by one-time processing.
3.3 Solid fraction
The percentage of the mass of the solid phase in the semi-solid slurry to the mass of the slurry.
Note: The solid phase fraction specified in this document is the solid phase fraction under equilibrium solidification conditions corresponding to the temperature of the semi-solid slurry. This solid phase fraction is not the actual solid phase Fraction.
3.4 Low solid phase semi-solid rheological slurry
It can flow naturally without forming a semi-solid rheological slurry with a fixed shape.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 20 pages — is available in the English PDF.
Referenced standards
Normative references
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Related Standards
GB/T 1173-2013 — Casting aluminum alloy
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GB/T 15114-2023 — Aluminum alloy die castings
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