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GB/T 29536-2013: Testing method for the forming limit diagram (FLD) of metal tube
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GB/T 29536-2013: Testing method for the forming limit diagram (FLD) of metal tube

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Testing method for the forming limit diagram (FLD) of metal tube ICS 77.040.10 J32 National Standards of People's Republic of China Limit Diagram (FLD) Test Method for forming metal pipe theforminglimitdiagram (FLD) ofmetaltube Issued on. 2013-06-09 2014-03-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard was drafted in accordance with GB/T 1.1-2009 given rules. This standard by the National Standardization Technical Committee Forging (SAC/TC74) and focal points. This standard is mainly drafted by. Baoshan Iron & Steel Co., Ltd., Shanghai Jiaotong University. The main drafters of this standard. Jianghao Min, Chen Xinping, Li Shuhui, in Zhong Qi. Limit Diagram (FLD) Test Method for forming metal pipe

1 Scope

This standard specifies the test methods for metal tube forming limit diagram (FormingLimitDiagram, Acronym FLD) of. This standard applies to the cross-sectional wall thickness of 0.20mm ~ 4.00mm, outer diameter 20mm ~ 120mm round metal pipe (including seamless And welded pipe).

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein Member. For undated references, the latest edition (including any amendments) applies to this document. GB/T 15825.2 sheet metal formability and test methods - Part 2. General test procedures Determination of GB/T 24171.2-2009 Sheet and strip metal material forming limit curves - Part 2. Laboratory shaped pole Determination limit curve GB/T 25134 and die forging parts three-dimensional geometrical optics standardized testing

3 Test principle

3.1 Test Forming Limit Diagram of metal pipe usually used internally pressurized tube loading manner. 3.2 The outer surface of the printed mesh tube placed inside the lower mold, the lower mold to complete the mold; filling the low-pressure pipe to the inside of the medium (liquid Or gas), and using a seal end portion of the punch; to seal the interior of the pipe filled with pressure medium (liquid or gas), so that the pipe in the mold Cavity deformation; at the same time, through the end of the punch displacement control to achieve different strain paths (see Figure 1); when the pipe local necking Or rupture, the test was stopped. Figure 1 Schematic test tube forming limit 3.3 Measuring surface sample produced a mesh size after deformation, calculated major and minor strain, draw forming limit diagram. ...