The quality requirements for the stretching of metal stamping parts mainly include the following aspects:

1. Dimensional accuracy requirements: The dimensions of metal stamping parts after stretching should meet the design requirements, and the dimensional deviation should be controlled within the allowable range to ensure that they can correctly fit with other components.

2. Surface quality requirements: The surface of the metal stamping parts after stretching should be flat and smooth, without obvious defects such as scratches, dents, oxidation, etc., to ensure their appearance quality.

3. Material mechanical performance requirements: The metal stamping parts after stretching should have sufficient strength and toughness, be able to withstand the designed load, and should not have problems such as fracture or deformation.

4. Stamping process requirements: During the stretching process, appropriate stamping process parameters should be used, such as the impact force of the punch, the shape and size of the punch, etc., to ensure that there is no excessive stress concentration and deformation during the stretching process.

5. The stretched metal stamping parts should undergo strict quality inspection, including appearance inspection, dimension measurement, mechanical performance testing, etc., to ensure that their quality meets the requirements.

In summary, the quality requirements for the stretching of metal stamping parts involve dimensional accuracy, surface quality, material mechanical properties, stamping process, and quality inspection. By controlling these requirements, it can be ensured that the stretched metal stamping parts can meet the design and usage requirements.