GB/T 44847-2024 Heavy mechanical – Design requirements for forging
1 Scope
This document specifies the classification, design principles, material selection, structural element design, and technical content design of forgings in heavy mechanical.
This document is applicable to the design of steel free forgings and steel die forgings formed by hot forging for heavy mechanical.
Note: In case of no confusion, the steel free forgings and steel die forgings herein is referred to collectively as "forgings".
2 Normative References
The following documents contain provisions which, through reference in this text, constitute provisions 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 321 Priority number and preferred numbers
GB/T 1182 Geometrical product specifications (GPS) - Geometrical tolerancing - Tolerances of form, orientation, location and run-out
GB/T 4458.4 Mechanical drawings - Dimensioning
GB/T 4458.5 Mechanical drawings - Indication for size And of fits
GB/T 37400.8-2019 Heavy mechanical general techniques and standards - Part 8: Forging
GB/T 37400.9 Heavy mechanical general techniques and standards - Part 9: Cutting
NB/T 47008 Carbon and alloy steel forgings for pressure equipment
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 8541 and NB/T 47008 and the following apply.
3.1
forging
processing method of forgings with certain geometric dimension, shape, and mass by causing partial or complete plastic deformation of billets and ingots under the action of pressure equipment and tools (molds)
[Source: GB/T 8541-2012, 3.1.19]
3.2
open-die forging; free forging
forging that only uses simple universal tools or directly applies external force to the steel billets between the upper and lower anvils of forging equipment to deform the steel billets and obtain the required geometric shape and internal mass
[Source: GB/T 8541-2012, 3.5.5, modified]
3.3
die forging
forging made from steel billets that undergo plastic deformation through mold forging
[Source: GB/T 8541-2012, 3.5.7, modified]
4 Classification of forgings
4.1 Structure classification
According to the structural shape, forgings are classified into:
a) Shaft type (solid) forgings;
b) Strip forgings;
c) Barrel forgings;
d) Disk forgings;
e) Circular (ring) forgings;
f) Irregular forgings [Other structural shapes except for items a) to e)].
Note: Irregular forgings are generally die forgings.
Contents Foreword i 1 Scope 2 Normative References 3 Terms and definitions 4 Classification of forgings 5 Design principles for forgings 6 Material selection 7 Structural element design for forgings 8 Technical content design Bibliography
