1、GM DAEWOO Auto & Technology EDS Engineering, GM DAEWOO Auto & Technology Standards EXPANDING TEST FOR TUBES EDS-T-7122 ISSUED DATE: 1990. 03. 21 REVISED DATE: 2006. 06. 19 VERSION: 3 EDS-T-7122EXPANDING TEST FOR TUBES PAGE: 1/3 ISSUED DATE: 1990. 03. 21 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWO
2、O Auto & Technology 1. PURPOSE The purpose of expanding test for tubes is to measure softness of tube by inspecting expanding amount of tube when expanding tube until cracks occur. 2. SCOPE This expanding test applies to the seamless tube and seam tube(welded tube) of metallic materials with circula
3、r section and its scope shall as shown in Table 1. Table 1. Expanding test Scope Due to the Tube Materials (Unit: mm) Tube material Nominal outside diameter (d0) Nominal wall thickness STEEL A1 & A1 ALLOYS Cu & Cu ALLOYS 150 max. 150 max. 150 max. 9 max. 10 max. No limit 3. SAMPLING OF TEST PIECE 3.
4、1. Test piece shall be taken from end part of the tube. 3.2. Make the length of the test piece long so that unexpanded part of tube may exist after test. The length shall be at least 1.5 times the outside diameter of the tube and shall not be shorter than 50mm. 3.3. Cut end part of the test piece sh
5、all be at a right angle to the longitudinal direction of the tube. 3.4. The edge of the test piece shall not be made round and sharp portions, if any, shall be filed off 4. TESTING DEVICE 4.1. Test shall be performed with UTM (Universal Testing Machine) and JIG for expanding test. 4.2. JIG for expan
6、ding test shall be the one which is constructed with steel materials having proper hardness. 4.3. The JIG surface which is in contact with the test piece shall be smooth. EDS-T-7122EXPANDING TEST FOR TUBES PAGE: 2/3 ISSUED DATE: 1990. 03. 21 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Tec
7、hnology Fig. 1. Layout for expanding test (In case of included angle ) 5. TESTING METHOD 5.1. The test shall be performed at room temperatures(1828). 5.2. Selection of JIG for expanding test shall be as shown in Table 2. Table 2. Selection of JIG Due to Tube Material Tube material Included angle of
8、JIG for expanding test ( ) STEEL A1 & A1 ALLOYS Cu & Cu ALLOYS 30, 45, 60 45 45 Note 1. The material for the jig shall be HRC 45 or of a higher class. 5.3. After applying lubricant to JIG, compress it into the test piece until crack occurs at the end part of the test piece. 5.4. During test, rotatio
9、n of test piece and JIG shall not occur. 5.5. Advancing speed of JIG for expanding test shall be 25mm/minute max. 5.6. After the test, measure the outside diameter of the test piece with cracks. 6. EVALUATION OF TEST RESULTS AND PREPARATION OF REPORT 6.1. Expanding amount (%) shall be obtained as fo
10、llows. d Expanding amount = - 100(%) do Where, do: Nominal outside diameter of tube before test, mm d : Outside diameter of tube after test, mm EDS-T-7122EXPANDING TEST FOR TUBES PAGE: 3/3 ISSUED DATE: 1990. 03. 21 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology d : Change amount o
11、f outside diameter of the tube before and after the test, mm (d-do) 6.2. Prepare report based on this standard and record following item. 6.2.1. Tube material 6.2.2. Nominal diameter (d0), mm 6.2.3. Nominal wall thickness, mm 6.2.4. Expanding amount (%) 6.2.5. Bursting or cracks 7. REFERENCE DIN 50135 Testing of metallic materials drift expanding test for tubes ISO R 195 Drift expanding test on copper & copper alloy tubes FORD LABORATORY TEST METHOD BA 155-01 Determination of deformability by drift expansion
