GB/T 3480.5-2021Calculation of load capacity of spur and helical gears - Part 5: Strength and quality of materials (English PDF)

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.

This document is the fifth part of GB/T 3480 "Calculation of Load Capacity of Spur Gears and Helical Gears". GB/T 3480 has released the following

section.

---Part 1.Basic principles, overview and general influence coefficient;

---Part 2.Calculation of tooth surface contact strength (pitting);

---Part 3.Calculation of the bending strength of gear teeth;

---Part 5.Strength and quality of materials;

---Part 6.Calculation of service life under variable load conditions.

This document replaces GB/T 3480.5-2008 "Calculation of Load Capacity of Spur Gears and Helical Gears Part 5.Strength and Quality of Materials",

Compared with GB/T 3480.5-2008, the main technical changes are as follows.

a) The scope of application has been changed, and "ISO 6336-6" and the calculation content of bevel gears have been added (see Chapter 1, Chapter 1 of the.2008 edition);

b) The terms and definitions have been changed, and the reference of "ISO 6336-1" has been added (see Chapter 3, Chapter 3 of the.2008 edition);

c) Added "Br method" (see 4.4);

d) The ME wire of quenched and tempered alloy steel is changed from a solid line to a dashed line (see Figure 5, Figure 5 of the.2008 edition);

e) The reference standards of some materials have been changed (see the notes in Table 1 and the notes in Table 1 of the.2008 edition);

f) The statement that "the depth of the hardened layer can be determined based on experience" for some materials has been deleted (see the notes in Figure 13 to Figure 16, the.2008 edition

Note in Figure 13~Figure 16);

g) The general principles of materials and heat treatment have been changed (see 6.1, 6.1 of the.2008 edition);

h) The quality and heat treatment requirements of materials have been changed in many places (see Table 2 to Table 8, and Table 2 to Table 8 of the.2008 edition), for example, the white

For bright layer requirements, change "and epsilon-/gamma' nitride ratio >8" to "and gamma'/epsilon >8" (see item 10 in Table 7,.2008 edition

Item 10 in Table 7);

i) Changed the shot peening process (see 6.7, 6.7 of the.2008 edition);

j) Removed Appendix C of the.2008 edition.

This document uses the translation method equivalent to ISO 6336-5.2016 ``Calculation of Load Capacity of Spur Gears and Helical Gears Part 5.Material

Strength and quality.

The Chinese documents that have consistent correspondence with the normatively cited international documents in this document are as follows.

---GB/T 225-2006 End quenching test method for steel hardenability (Jominy test) (ISO 642.1999, IDT)

---GB/T 1356-2001 Standard basic rack tooth profile for cylindrical gears for general machinery and heavy machinery (idtISO 53.1998)

---GB/T 3374.1-2010 Gear terms and definitions Part 1.Geometric definitions (ISO 1122-1.1998, IDT)

---GB/T 3480.1-2019 Calculation of load-carrying capacity of spur gears and helical gears Part 1.Basic principles, overview and general effects

Coefficient (ISO 6336-1.2006, IDT)

---GB/T 3480.2-2021 spur gear and helical gear load capacity calculation part 2.tooth surface contact strength (pitting) calculation

(ISO 6336-2.2019, IDT)

---GB/T 3480.3-2021 spur gear and helical gear load capacity calculation part 3.gear tooth bending strength calculation

(ISO 6336-3.2019, IDT)

---GB/T 5617-2005 Determination of the effective hardened layer depth after induction hardening or flame quenching of steel (ISO 3754.1976,

NEQ)

---GB/T 9450-2005 Determination and verification of the carburizing and quenching hardened layer depth of steel parts (ISO 2639.2002, MOD)

---GB/T 10095.1-2008 Cylindrical gear accuracy system Part 1.Definition and allowable value of tooth surface deviation on the same side of the tooth

(ISO 1328-1.1995, IDT)

---GB/T 10561-2005 Determination of the content of non-metallic inclusions in steel Standard Grading Chart Microscopic Inspection Method (ISO 4967.

1998, IDT)

---GB/T 13304.2-2008 Steel Classification Part 2.Classification by main quality grade and main performance or service characteristics

(ISO 4948-2.1981,MOD)

---GB/T 17879-1999 Erosion inspection of surface tempered gear after grinding (idtISO 14104.1995)

---GB/T 18253-2018 Types of steel and steel product inspection documents (ISO 10474.2013, IDT)

---GB/T 33362-2016 Conversion of hardness values of metallic materials (ISO 18265.2013, IDT)

---GB/T 34484.1-2017 Heat-treated steel Part 1.Non-alloy steel (ISO 683-1.2016, MOD)

---GB/T 34484.2-2018 Heat-treated steel Part 2.Quenched and tempered alloy steel (ISO 683-2.2016, MOD)

---GB/T 37618-2019 Nitrided steel (ISO 683-5.2017, MOD)

This document has made the following editorial changes.

--- Change the symbols "Ydeltarel-T" and "YRrel-T" in 5.3.2 of ISO 6336-5.2016 to "YdeltarelT" and "YRrelT" respectively;

---The reference ISO 1122-1 was included in the list of Chapter 2, and ISO 10300 (all parts) was added to the reference;

---Change the note in Table 1 of ISO 6336-5.2016 to the paragraph in Table 1.

This document was proposed and managed by the National Gear Standardization Technical Committee (SAC/TC52).

Drafting organizations of this document. Zhengzhou Machinery Research Institute Co., Ltd., Zhejiang Shuanghuan Transmission Machinery Co., Ltd., Nanjing High Speed Gear Manufacturing

Co., Ltd., Chongqing Gearbox Co., Ltd., Xi'an Fast Automobile Transmission Co., Ltd., Dalian Innovation Gearbox Manufacturing Co., Ltd., Zhejiang

Jiangzhong Diesel Machinery Co., Ltd., Zhengzhou China Railway Transportation Equipment Technology Co., Ltd., Qijiang Gear Transmission Co., Ltd., Luoyang Keda Geer Chuan

Dynamic Research Institute Co., Ltd., Jiangsu Zhonggong High-end Equipment Research Institute Co., Ltd., Nanjing Kerun Industrial Media Co., Ltd., Zhengzhou High-end Equipment

Equipment and Information Industry Technology Research Institute Co., Ltd., China National Machinery Productivity Promotion Center.

Introduction

The GB/T 3480 series constitutes a system for calculating the load capacity of involute cylindrical gears (internal or external teeth), taking into account previous practical experience

The summary and application of new technologies in the future.

The gear fatigue strength data listed in this document may vary widely. This is due to chemical composition fluctuations, material defects, geometrical

Structure, thermal processing (such as bar type, forging-rolling, forging ratio), heat treatment process and residual stress and other factors.

The tables in this document list the main influencing factors of gear strength and the technical requirements for different material quality levels. These factors

The influence of wheel contact fatigue strength and bending fatigue strength is reflected in each figure.

This document relates to the most commonly used gear materials and heat treatment processes, but does not involve special materials, special heat treatment or processing processes. In addition,

This document also does not evaluate the applicability of various materials, special processing or heat treatment processes.

Calculation of load capacity of spur and helical gears

Part 5.Strength and quality of materials

1 Scope

This document gives the tooth surface contact strength limit and tooth root bending strength limit, and provides recommended values. This document also specifies the material quality

The technical requirements of the amount and heat treatment, and explain its influence on the strength limit.

The recommended values in this document apply to the strength calculations in ISO 6336-2, ISO 6336-3 and ISO 6336-6, and are suitable for industrial gears, high

Speed gears and marine gear products can also be used to calculate the load-carrying capacity of bevel gears in ISO 10300.This document can be used in the above standards

Involved meshing state, basic rack tooth profile, tooth profile parameters, structural design, etc., and the calculation results are consistent with those of ISO 6336-1 and ISO 10300-1.

The calculation compliance is very good.

2 Normative references

The contents of the following documents constitute indispensable clauses of this document through normative references in the text. Among them, dated reference documents,

Only the version corresponding to that date is applicable to this document; for undated references, the latest version (including all amendments) is applicable to this document.

file.

ISO 53 standard basic rack tooth profile for cylindrical gears for general machinery and heavy machinery (Cylindricalgearsforgeneraland

heavyengineering-Standardbasicracktoothprofile)

ISO 642 Steel Hardenability Test Method for End Quenching (Jominy Test) [Steel-Hardenabilitytestbyend

quenching(Jominytest)]

ISO 643.2012 Steel-Micrographicdeterminationofthe

apparentgrainsize)

ISO 683-1 Heat-treated steel, alloy steel and free-cutting steel Part 1.Non-alloy steel (Heat-treatablesteels, aloy

steelsandfree-cuttingsteels-Part 1.Non-aloysteelsforquenchingandtempering)

ISO 683-2 Heat-treated steel, alloy steel and free-cutting steel Part 2.Quenched and tempered alloy steel (Heat-treatablesteels,

aloysteelsandfree-cuttingsteels-Part 2.Aloysteelsforquenchingandtempering)

ISO 683-3 Heat-treated steel, alloy steel and free-cutting steel Part 3.Carburizing and quenching steel (Heat-treatablesteels, aloy

steelsandfree-cuttingsteels-Part 3.Case-hardeningsteels)

ISO 683-4 Heat-treated steel, alloy steel and free-cutting steel Part 4.Free-cutting steel (Heat-treatablesteels, aloy

steelsandfree-cuttingsteels-Part 4.Free-cuttingsteels)

ISO 683-5 Heat-treated steel, alloy steel and free-cutting steel Part 5.Nitrided steel (Heat-treatablesteels, aloysteels

andfree-cuttingsteels-Part 5.Nitridingsteels)

ISO 1122-1 Gear Terms and Definitions Part 1.Geometric Definitions (Vocabularyofgearterms Part 1.Def-

initionsrelatedtogeometry)

ISO 1328-1 Cylindrical Gear Accuracy System Part 1.The definition and allowable value of the deviation of the tooth on the same side of the tooth (Cylindrical

gears-ISO systemofflanktoleranceclassification-Part 1.Definitionsandalowablevaluesofdevia-

tionsrelevanttoflanksofgearteeth)

ISO 2639 Steel-Determination and Verification of the Hardened Layer Depth of Carburized and Quenched Steel Parts

depthofcarburizedandhardenedcases)