The test content of the geometrical size of the cylindrical coil spring is shown in Table 1. According to the spring type and drawing requirements, select the content of the list for testing.
Table 1 The detection content of the geometrical size of the spiral spring and the measuring tools
Serial number inspection Content code inspection quantity available Note
1 Spring material diameter d vernier caliper or dry ruler rectangular section: side length
Shaped section: shape
2 Spring free height or length Ho vernier height ruler, steel tape measure, three-level precision plate, tools
Microscope, projector, length sorter
3 spring diameter Dl
D2 vernier caliper, inspection sleeve or spindle
4 Number of spring turns n1
5 Spring end gap and end thickness vernier caliper, feeler gauge
6 Spring pitch and uniformity t
δ load testing machine
7 Spring grinding surface angle gauge, surface roughness tester
8 Verticality of the spring ⊥ second-level precision dry plate, third-level precision wide seat square, feeler gauge
9 Parallelism between the two ends of the spring ∥ three-level precision plate, dial indicator
10 Straightness of the spring-two-level precision plate, feeler gauge
11 The relative angle of the spring and the two shackles is Δ°, the three-level precision plate, the precision ≥5, the angle gauge and the width ruler
12 spring shackle center plane and axis line position degree Δ three-level precision flat plate, precision ≥5, angle gauge, vernier card
Ruler or vernier caliper with depth sounding device
13 spring free angle φ tool microscope, angle gauge with precision ≥5
14 Spring torsion arm length three-level precision flat panel, tool microscope or projector, depth
Ruler or vernier caliper with depth sounding device, wide seat angle ruler
15 spring torsion arm bending degree α tool microscope, precision ≥5, angle gauge
Note: The accuracy of vernier calipers is generally not less than 0.02mm.