ISO 7802 Vật liệu kim loại – Dây điện – Gói máy kiểm tra
ISO 7802 Vật liệu kim loại – Dây điện – Wrapping test
Vật liệu kim loại – Dây điện – Gói máy kiểm tra
ISO 7802 Vật liệu kim loại – Dây điện – Gói máy kiểm tra
1. Phạm vi
This International Standard specifies a method for determining the ability of metallic wire of diameteror thickness 0,1 mm to 10 mm inclusive, to undergo plastic deformation during wrapping.
2. Principle
The kiểm tra gói consists of winding a wire to a specified number of turns around a mandrel of thediameter specified in the relevant standard to form a closely wrapped helix.
lt may also include a specified sequence of winding and unwinding, or even rewinding.
3. Test equipment
The testing machine shall be constructed so the wire can be wound around the mandrelin a helix so thatadjacent wraps of the coil are in contact. A piece of the wire to be tested may be used as the mandrel,provided it is of the specified mandrel diameter and of sufficient hardness.
4. Procedure
4.1 In general, the test is carried out at ambient temperature between 10 Cand 35 °C.Tests carried outunder controlled conditions shall be made at a temperature of 23 °C±5℃.
4.2 Without applying any torsion, wind the wire in a helix tightly around the mandrel at a constant ratenot exceeding 1 wrap per second so that the adjacent wraps of the coil are in contact. If necessary, reducethe rate of wrapping to ensure that the heat generated does not affect the result of the test.
4.3 To ensure tight winding, a tensile stress not exceeding 5 % of the nominal tensile strength of thewire may be applied during winding.
4.4 When unwinding,or unwinding and rewinding, are specified, the rate shall be sufficiently slow toprevent any rise of temperature likely to affect the result of the test. At the end of the unwinding, at leastone turn shall not be unwound.
4.5 The interpretation of the wrapping test is carried out according to the requirements of the relevantStandard. When these requirements are not specified, absence of cracks visible without the use ofmagnifying aids is considered as sufficient evidence that the test piece withstood the test. Wire with athickness or diameter less than 0,5 mm shall be examined with approximately 10- times magnification.
5. Test report
The test report shall include the following information:
Một) a reference to this International Standard.
b)identification of the test piece (type of material, type of coating, vân vân.)
c)diameter or thickness of the test piece.
d)diameter of the mandrel.
e)test conditions(number of turns, or the wound length).
f)test result.
ISO 7802 Vật liệu kim loại – Dây điện – Gói máy kiểm tra
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