Трубчатые валы, твердое хромирование

Description Optimal shaft surface corrosion protection on outer diameter Product description Tubular shafts are hard chrome-plated on the outer diameter. Technical data Dimensional accuracy and tolerance zones The diameters of the precision steel shafts come in h6 and h7 tolerance zones. The adjacent table shows information on dimensional accuracy. The diameter tolerance of annealed shaft cross-sections vary slightly from the specified tolerance zone. Ød mm 25 30 40 50 60 80 Tolerance grade h7 t1 µm 9 11 13 t2 1) µm 13 16 19 t3 2) µm/m 100 Ra µm 0.32 1) Measurements if differences in diameter 2) The smallest possible value is 40 µm for lengths under 1 m. Straightness is measured based on ISO 13012. Measurement of straightness based on ISO 13012 The measuring points are evenly distributed between the support points and the shaft sections protruding past them. More supports are used accordingly for long, thin shafts. Straightness is half of the gauge measurement when turning the shaft 360°. Measurement of roundness The drawing shows the roundness of a raw shaft compared to a precision steel shaft. a) Raw shaft b) Precision shaft Shaft hardness The outer zone of the shaft is induction-hardened. Depending on the shaft diameter, the depth of hardness ranges from 0.4 to 2.4 mm. Linear and transverse surface hardness and depth of hardness are highly consistent. This ensures high dimensional consistency and long service life. The adjacent figure shows the cross-section and longitudinal section of a hardened and polished precision steel shaft. The hardened surface zone is made visible by caustic etching. Technische Daten Ød mm 25 30 40 50 60 80 Internal Ød mm 14 19 26.5 29.6 36.5 57.4 L 1) mm 75 Mill-cut length mm 6100 Lmax mm 6100 Depth of hardness (min.) mm 0.9 1.5 2.2 m kg/m 2.63 3.3 5.5 9.95 13.89 19.02 1) Regarding geometry and hardness Legend Symbol Description Unit Ød Shaft diameters mm L Length mm Lmax Maximum length mm m Mass kg/m t1 Roundness tolerance μm t2 Cylindricity μm t3 Straightness μm/m Ra Surface roughness μm Technical data Project planning information Shaft machining Chamfering When used as round guides for Linear Bushings, the ends of steel shafts must be chamfered so the ball retainers/wiper seals are not damaged when the Linear Bushings are pressed onto the shafts. The figure and table show the chamfering dimensions. Linear bushings with wiper seals cannot be pressed over sharp edges on the shaft (e.g., retaining ring grooves) since the sealing lips will be damaged. Shaft diameters mm 3 4 5 8 10 12 14 16 20 25 25 30 40 50 60 80 Length of chamfers L1 mm 1 1,5 1,5 1,5 1,5 2 2 2 2 2 2 2 3 3 3 3 Processing Hardened and polished steel shafts are available in mill-cut lengths. These can be cut to size and machined to include: Spigots Female and male threads Counterbores Radial and axial holes Grooves Other machining Unmachined, cut-to-size shafts come chamfered for accident prevention unless ordered otherwise. Annealing machined sections