Automotive wire harness processors' requirements for copper wire quality

Automotive wire harness processors should conduct strict inspections on the quality of the copper wire. The specific inspection standards must be carried out in strict accordance with the following steps:

1. Appearance inspection: The bobbin filled with copper wire shall be placed on the packaging table, and a white paper shall be placed in one hand and placed in a position of 1-2 cm from the copper wire, and the other hand shall be the bobbin of the copper wire. Roll one week and visually check whether the appearance meets the following criteria:

1) Smooth surface, no black line, no chaotic line, no pitting, no oxidation, no smear, no scratches, no tin plating (sticky tin, leaking tin), no slash, no hand joint, No fingerprints.

3) The tension is moderate but not too tight or too tight.

4) The surface of the copper wire is not sticky after rolling (overfilled)

Second, wire diameter inspection: wire diameter should be in accordance with national general standards, customers have special requirements, strictly control according to their requirements. The specific inspection steps are as follows:

1) First, debug if the micrometer is zero.

2) Place the copper wire to be inspected outside the clamped line of the micrometer, and twist the end of the micrometer with appropriate force (the force should not be too heavy or too light).

3) Observe the reading when you hear the micrometer vibrate three times.

4) It should be checked repeatedly that the second and third readings are consistent (the same copper wire) cannot detect the same position each time, and should be tested in sections.

5) The copper wire with a wire diameter of more than 0.2 cm is used to inspect the different interfaces of the copper wire to avoid flat wires.

3. Elongation test: The elongation rate is in accordance with national standards. When customers have special requirements, they are strictly controlled according to their requirements. The specific steps are as follows:

1) Turn on the switch of the elongation tester.

2) Observe whether the clip on the left side is in the original position and whether the reading displayed by the instrument returns to zero. If the left sensing clip is not in the original position, the reading displayed by the instrument does not return to zero. Press the recovery button and the zero button immediately.

3) Gently open the clip, put one end of the copper wire to be tested into the induction clip, press the induction clip, then gently straighten the copper wire and put the other end into another induction clip, press the induction clip Clamp the copper wire and press the test button.

4) After the copper clip is pulled off and stops moving, the reading displayed is the elongation of the detected copper wire.

Fourth, resistivity test: Resistivity requirements in accordance with national standards specific inspection steps are as follows:

1) Turn on the power switch of the resistivity tester.

2) Clamp the pair of sensing clips on both sides and observe if the reading is zero.

3) If the reading displayed by the instrument is 0, the length of the copper wire to be inspected shall be 1 m long and the two ends of the copper wire shall be clamped by two induction clips. The detected copper wire shall not be in contact with any metal objects. key.