What are the technical requirements for mechanical drawing writing?

Complete set of technical requirements for mechanical drawing

1. Parts shall be derusted.

2. There should be no scratches, scratches and other defects on the machined surface that damage the surface of the parts.

3. Remove burrs and flash.

4. after conditioning, RC for 28 ~ 32 hours.

5. The parts are quenched by high frequency and tempered at 350 ~ 370℃ for 40 ~ 45 hours.

6. The carburizing depth is 0.3mm.

7. Carry out high-temperature aging treatment.

8. The shape tolerance not noted shall meet the requirements of GB 1 184-80.

9. If not specified, the allowable deviation of the length dimension is 0.5mm..

10. The casting tolerance zone is symmetrical to the basic size configuration of the blank casting.

1 1. Unregistered fillet radius R5.

12. All unmarked chamfers are 2× 45.

13. The acute angle is blunt.

14. Before assembly, all seals must be saturated with oil.

15. When assembling rolling bearings, it is allowed to heat them with oil, and the oil temperature shall not exceed 100℃.

16. After the gear is assembled, the tooth surface contact point and backlash shall comply with the provisions of GB 10095 and GB 1 1365.

17. Parts must be cleaned before assembly, and there must be no burr, flash, scale, rust, debris, oil stain, colorant and dust.

18. Before assembly, recheck the main fit dimensions of parts, especially the interference fit dimensions and related accuracy.

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There are many specific requirements, which generally need to be filled in according to the actual needs of designers.