1、GM DAEWOO Auto & Technology EDS Engineering, GM DAEWOO Auto & Technology Standards METHOD OF TORSION, WINDING AND BENDING TEST FOR STEEL WIRE EDS-T-7154 ISSUED DATE: 1994. 04. 06 REVISED DATE: 2006. 06. 19 VERSION: 2 EDS-T-7154METHOD OF TORSION, WINDING AND BENDING TEST FOR STEEL WIRE PAGE: 1/2 ISSU
2、ED DATE: 1994. 04. 06 REVISED DATE: 2006. 06. 19 VERSION: 2 GM DAEWOO Auto & Technology 1. PURPOSE This standard aims at examining a fractured surface condition, torsion condition and surface condition of wire when performing the torsion, winding and bending test for steel wire at more than specifie
3、d angle and for more than specified time. 2. SCOPE This standard specifies the method of torsion, winding and bending test for steel wire. 3. DEFINITIONS 3.1. Torsion test A test to examine the torsion numbers, condition of fractured surface and torsion by applying the torsion moment to the test pie
4、ce(wire with a diameter of 6.0X or less). 3.2. Winding test A test to examine the occurrence of defects harmful to the surface of wire and fractured or not after performing the winding test to the test piece(wire with a diameter of 6.0X or less). 3.3. Bending test A test to examine the occurrence of
5、 defects harmful to the surface of wire and fractured or not after performing the bending test to the test piece(wire with a diameter of 6.0X or more). 4. TEST PIECE 4.1. The test pieces shall be taken from each ends of the wire. 4.2. The test piece shall be constructed in an appropriate length for
6、each testing methods. 4.3. For the first approval at least 3 test piece, and for the routine quality control at least 1 test piece shall be used. 5. TESTING METHOD 5.1. Torsion test 5.1.1. Clamp both ends of the test piece firmly with the clamping distance 100 times as large as the wire diameter. 5.
7、1.2. Stretch the test piece just hard enough not to be bent. 5.1.3. Twist one end until it fractures and examine the number of twists, the condition of fractured section and the condition of twist at that time. 5.1.4. The number of twists tested with a clamping distance other than 100 times as large
8、 as the wire diameter EDS-T-7154METHOD OF TORSION, WINDING AND BENDING TEST FOR STEEL WIRE PAGE: 2/2 ISSUED DATE: 1994. 04. 06 REVISED DATE: 2006. 06. 19 VERSION: 2 GM DAEWOO Auto & Technology shall increase and decrease in direct proportion to the clamping distance and be converted into number of t
9、he case 100 times as large as the wire diameter. 5.2. Winding test Wind at least two turns a test piece closely around a mandrel of a diameter as large as the diameter of the test piece and examine the surface condition. 5.3. Bending test Bend the test piece to an angle around an arc of the radius e
10、qual to the diameter of the test piece and examine the surface condition. 6. EVALUATION The evaluation of the test result shall conform to each standard or the drawing, or shall be agreed upon between the parties concerned. 7. REFERENCE KS D 3510 (3556) Hard drawn steel wires (Piano wires) KS D 3581 Oil tempered chromium vanadium alloy steel wire for valve spring
