GB/T 1972-2005Disc springs - Part 1: Calculation (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 for Standardization Documents" drafting:

This document is Part 1 of GB/T 1972 "Disc Springs": GB/T 1972 has issued the following parts:

--- Part 1: Calculation;

--- Part 2: Technical conditions:

This document is modified to adopt ISO 19690-1:2017 "Disc Springs Part 1: Calculation":

Compared with ISO 19690-1:2017, this document has made the following structural adjustments:

--- 6:3 and 6:4:1 of this document correspond to 6:3 of ISO 19690-1:2017;

--- 6:4:2 of this document corresponds to 6:4 of ISO 19690-1:2017;

--- 6:4:3 of this document corresponds to 6:5 of ISO 19690-1:2017;

--- 6:4:4 of this document corresponds to 6:6 of ISO 19690-1:2017;

--- 6:4:5 of this document corresponds to 6:7 of ISO 19690-1:2017;

--- 8:1 of this document corresponds to 9:1 and 9:2 of ISO 19690-1:2017;

--- 8:2 and 8:3 of this document correspond to Chapter 8 of ISO 19690-1:2017:

The technical differences between this document and ISO 19690-1:2017 and their reasons are as follows:

--- Replaced ISO 26909 (see Chapter 3) with the normatively quoted GB/T 1805 to adapt to the technical conditions of our country;

--- Deleted the reference to ISO 16249 (see Chapter 4);

--- Added the load calculation formula (9) and formula (11) of the disc spring during flattening (see 6.4:2), because the computer-aided calculation method is not used when calculating, the flattened load will be used;

--- Changed Figure 3 (see 7.1:2), which is more in line with the actual situation in our country;

---Changed the value of h0/t of the single disc spring (see 7.2:1) to avoid ambiguity when selecting the C series disc spring (h0/t~1:30);

--- Changed the allowable stress requirements for static loads, and added a reference to the normative reference file GB/T 1222 (see 8.2):

The following editorial changes have been made to this document:

--- Modified the title of Figure 1 (see 5.1);

--- Put the normative reference document GB/T 1972.2-2023 "Disc Spring Part 2: Technical Conditions" into the reference;

---In 8:3:2, three examples about the key positions of disc spring fatigue damage have been added;

--- Increased Appendix A (informative) calculation examples;

--- Added Appendix B (informative) other combined disc springs;

--- Increased the influence of appendix C (informative) friction on spring characteristics;

--- Added Appendix D (informative) commonly used materials for disc springs:

Please note that some contents of this document may refer to patents: The issuing agency of this document assumes no responsibility for identifying patents:

Introduction

Disc spring is a kind of universal elastic element, which is widely used in machinery, chemical industry, aviation, construction and other industries:

GB/T 1972 "Disc Springs" is divided into two parts:

--- Part 1: Calculation: The purpose is to provide a set of standard disc spring structure type, grouping and size series based on the calculation method of the disc spring in the scope of application provides a theoretical basis for the verification and design of the disc spring:

--- Part 2: Technical conditions: The purpose is to standardize the technical conditions, test methods and acceptance rules of disc springs:

Disc Springs Part 1: Calculations

1 Scope

This document gives the calculation criteria and requirements for single-piece disc springs and combined disc springs (hereinafter referred to as "disc springs") with rectangular cross-sections:

Including definitions of related concepts, calculation formulas and checking of key positions of fatigue damage:

This document applies to single disc springs and combined disc springs:

This document does not apply to grooved disc springs, diaphragm disc springs and other structural types of disc springs:

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text: Among them, dated references for documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document:

GB/T 1222 Spring steel GB/T 1805 Spring Terminology (GB/T 1805-2021, ISO 26909:2009, MOD)

3 Terms and Definitions

The terms and definitions defined in GB/T 1805 apply to this document:

4 Symbols, parameter names and units

The symbols, parameter names and units used in this document are shown in Table 1:

Table 1 Symbols, parameter names and units

Symbolic parameter name unit C1,C2,C3,C4,k1,k2 Coefficients-D Outer diameter mm D0 neutral diameter mm d Inner diameter mm E Elastic modulus of material MPa F Single disc spring load N Fc is the calculated load N of the single disc spring at the flattened position FG combined disc spring (hereinafter referred to as "combined disc spring") load N Ft Detection load (load at Ht position) N F1, F2, F3, corresponding to the load N of disc spring height H1, H2, H3 Ht The height corresponding to the detection load (Ht=H0-0:75h0) mm