GB/T 15825.7-2008Sheet metal formability and test methods - Part 7: Earing test (English PDF)
金属薄板成形性能与试验方法 第7部分：凸耳试验
This is a limited preview
Buy now to download the full PDF (12 pages)
Need quotation for your management?
Get a formal quotation for GB/T 15825.7-2008 in 30 minutes.
Issued by
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of China
Level / Type
National · Recommended
Issue date
December 23, 2008
Implementation date
June 1, 2009
Scope
GB/T 15825.7-2008 is the English-translated version of 金属薄板成形性能与试验方法 第7部分：凸耳试验.
GB/T 15825.7-2008 specifies the earing test for sheet metal of 0.10 mm to 3.00 mm thickness: a method for assessing planar plastic anisotropy by drawing a circular blank into a cylindrical cup and measuring the ears formed at its rim, with the earing height and the earing ratio Ze as indexes.
It defines the symbols, sets requirements for the test tooling and testing machine (centring, blank holder force control, punch diameters of 33 mm or 50 mm with die diameters, profile radii and surface roughness by sheet thickness, working surfaces of at least 750 HV30), and for the circular test pieces, with a recommended drawing ratio of 1.8.
The procedure covers temperature, lubrication, initial blank holder forces for aluminium alloy and steel sheet, the conditions that invalidate a test, measurement of ear peak and valley heights to ± 0.05 mm and of their azimuth angles, at least three valid repeats, the formulae for mean and maximum earing height and earing ratio, and the content of the test report; the normative Annex A contains test provisions taken over from the 1995 edition.
It replaces GB/T 15825.7-1995: the text now refers to ISO 11531:1994, GB/T 4340.1 has been added as a normative reference, and part of the former test provisions has been moved, with editorial changes, to Annex A. Issued on 23 December 2008, in force since 1 June 2009.
Classification: ICS 77.040.10, CCS J32. The document runs to 12 pages, delivered complete in English translation.
Found what you need?
Document preview — GB/T 15825.7-2008
National Standard of the People's Republic of China
- ICS
- 77.040.10
- Classification
- J32
- Replacing
- GB/T 15825.7-1995
Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of China
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Symbols, names and units
- 4 Principle of the test
- 5 Test apparatus and testing machine
- 6 Test specimens
- 7 Test procedure and operating method
- 8 Calculation of the test results
- 9 Test report
3 Symbols, names and units
4 Principle of the test
5 Test apparatus and testing machine
6 Test specimens
7 Test procedure and operating method
8 Calculation of the test results
9 Test report
Foreword
GB/T 15825, Sheet metal formability and test methods, is divided into 8 parts:
- Part 1: Formability and indexes;
- Part 2: General test procedures;
- Part 3: Drawing and drawing load test;
- Part 4: Hole expanding test;
- Part 5: Bending test;
- Part 6: Conical cup test;
- Part 7: Earing test;
- Part 8: Guidelines for the determination of forming limit diagrams (FLD).
This part is Part 7 of GB/T 15825.
This part replaces GB/T 15825.7-1995, Sheet metal formability and test methods - Earing test.
Compared with GB/T 15825.7-1995, the main changes in this part are as follows:
- a "Foreword" has been added;
- GB/T 4340.1 has been added to "2 Normative references";
- the text refers to the content of ISO 11531:1994, Metallic materials - Earing test (English edition), and some of the test provisions of the original standard have been made Annex A of this part;
- editorial changes have been made to the original standard in Annex A.
Annex A of this part is normative.
This part was proposed by the China Machinery Industry Federation.
This part is under the jurisdiction of the National Technical Committee on Forging and Stamping of Standardization Administration of China.
Drafting organisations of this part: Zhengzhou University, Wuhan University of Technology, Huazhong University of Science and Technology, Beijing University of Aeronautics and Astronautics, Dongfeng Motor Die and Stamping Co., Ltd. and Baoshan Iron and Steel Co., Ltd.
Main drafters of this part: Cao Hongshen, Jiang Kuihua, Hua Lin, Huang Shangyu, Mao Huajie, Li Zhigang, Li Xiaoxing, Li Jianhua and Chen Xinping.
Previous editions of the standard replaced by this part: GB/T 15825.7-1995.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 12 pages — is available in the English PDF.
Referenced standards
Similar standards
Editions of GB/T 15825.7
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 15825.7-2008 | Sheet metal formability and test methods - Part 7: Earing test | current edition | Current |
| GB/T 15825.7-1995 | Sheet metal formability and methods-Earing test | previous edition | Superseded |
This page sells the current edition, GB/T 15825.7-2008. Earlier editions are listed for reference only.
How to Download GB/T 15825.7-2008
- 1
Add to cart
Click "Download PDF" on this page and choose "Buy this standard". You can add more standards before checkout.
- 2
Checkout
Enter your email and billing details. Payment is processed securely by Stripe (cards or bank transfer). Prefer bank details? Request a quotation (min. order $300).
- 3
Instant delivery (0–9 sec)
Delivery is automatic: within seconds of payment you'll receive an email with a secure download link. The link stays valid for 72 hours.
- 4
Invoice included
A tax invoice is attached to the confirmation email. Need a custom invoice? Contact us.
Related Standards
GB/T 15825.2-2008 — Sheet metal formability and test methods - Part 2: General test rules
GB/T 4340.1-2024 — Metallic materials - Vickers hardness test - Part 1: Test method
GB/T 15825.1-2008 — Sheet metal formability and test methods - Part 1: Formability and indexes
Secure payment via Stripe
Payments accepted
GB/T 15825.7-2008
$165.00