1.3 Working temperature T 200,0 1.4 Working environment. F... Guided seating. Light service. Cold formed springs. Music wire ASTM A228

Transcription

1 Helical cylindrical compression spring of round wires and bars i ii? 1.0 Calculation without errors. Project information Input parameters section Selection of load conditions, spring operational and production parameters Working cycle operational parameters Method of loading Fatigue loading 1.3 Working temperature T 200,0 [ F] 1.4 Working environment Non corrosive 1.5 Spring design 1.6 Seating of the spring F... Guided seating 1.7 Design of spring ends J... Closed ends ground 1.8 Surface treatment Shot peened springs 1.9 Direction of coil winding Right 1.10 Number of end / ground coils n C / n G 2,0 1, Spring exposed to static loading 1.12 Operational loading mode Light service 1.13 Desired level of safety s s 1.14 Method of stress curvature correction 1,05 Without correction 1.15 Spring exposed to fatigue loading 1.16 Operational loading mode Continuous loading 1.17 Desired spring service life in thousands of cycles N 1.18 Desired level of safety s f 1.19 Method of stress curvature correction Infinite life 1,05 Correction by Wahl 2.0 Options of spring material. 2.1 Production method : 2.2 Spring material : Cold formed springs Music wire ASTM A Field of use of the selected material 2.4 Suitability for fatigue load Excellent 2.5 Relative strength High 2.6 Corrosion resistance Insufficient 2.7 Max. operational temperature 250 [ F] 2.8 Delivered wire diameters 0,005-0, Mechanical and physical properties of the material Modulus of elasticity in shear G Modulus of elasticity at operational temperature G Density ρ 490 [lb/ft 3 ] Strength characteristics of the material Ultimate tensile strength S u Permissible torsional stress τ A 122

2 2.16 Endurance limit in shear τ e 87, Endurance limit by finite life τ f 87, Spring design. Desired parameters of working cycle Deviat. [%] 3.2 Maximum working loading F 8 100,0 10,0 3.3 Minimum working loading F 1 20,0 30,0 3.4 Fully loaded spring length L 8 2,500 10,0 3.5 Required spring working stroke H 1,000 0,0 3.6 Preloaded spring length L 1 3,5 7, Filters of the designed solution 3.8 Maximum permissible spring outer diameter D emax 1, Minimum permissible spring inner diameter D imin 1, Permissible division of the number of active coils 1/ Permissible exceeding of spring limit dimensions 0,0 [%] Perform check of buckling Perform check of the limit working length Keep to the required level of safety with the strength check No Yes Yes 3.15 Quality criterion Combined 3.16 Number of design iteration Medium Options of solutions Sort design result by Qualities of solutions 3.19 Run design calculation 3.20 ID D D e D i d n L 0 L 1 L 8 F 1 F 8 τ 8 s s s f m quality Results section Summarized list of designed spring parameters. Refresh results from the selected spring design 2 1,5 1 0, ,5 L0 L1 L8 L9-1 -1,5

3 -1, Spring loading Minimum working loading F 1 20, Maximum working loading F 8 100, Spring dimensions 4.7 Recommended limits of wire diameter d min / d max 0,0819 0, Wire diameter d 0, Outer / inner spring diameter D e / D i 1,4717 1, Spring index c 4.11 Number of active coils n 5, Recommended limits of free spring length L 0min / L 0max 2,4850 4, Free spring length L 0 3, Recommended pitch limits t min / t max 0,3929 0, Space / pitch between coils of free spring a / t 0,4609 0, Parameters of preloaded spring 4.17 Spring deflection s 1 0, Spring length L 1 3, Spring stress τ 1 15, Parameters of fully loaded spring Spring deflection s 8 1, Spring length L 8 2, Spring working stroke H 1, Spring stress τ 8 78, Parameters of spring limit state Theoretic spring limit loading F 9 202, Theoretic spring deflection / length s 9 / L 9 2,5350 1, Teoretic stress τ 9 159, Sum of min. permissible spaces between active coils s amin 0, Minimum spring limit length L minf 1, Spring mechanical and physical properties 4.32 Spring constant k 80,00 [lb/in] 4.33 Spring deformation energy W 8 5,21 [ft lb] 4.34 Critical spring speed v k 51,74 [ft/s] 4.35 Natural spring frequency f 241,59 [Hz] 4.36 Developed wire length l 31, Spring weight m 0,184

4 Curvature correction factor K s 1, Corrected stress of fully loaded spring τ 8C 78, Permissible torsional stress τ A Level of safety 4.43 Check of buckling 4.44 Permissible / actual max. working compression of spring ,33 [%] 4.45 Strength check of a spring exposed to fatigue loading 4.46 Curvature correction factor K f 1, Corrected stress of fully loaded spring τ 8C 92, Max. fatigue strength for the given loading τ max 98, Level of safety 1, Parameters of designed spring for specific working load or spring length. Spring parameters for the given working loading 5.2 Spring loading F x 50,0 5.3 Spring deflection s x 0, Spring length L x 3, Spring stress τ x 39, Spring parameters for the given working length Spring length L x 3, Spring deflection s x 0, Spring produced force F x 60, Spring stress τ x 47, Check of loading capacity of a spring exposed to fatigue loading. 6.1 Curvature correction factor K f 1, Corrected stress of preloaded spring τ 1c 18, Corrected stress of fully loaded spring τ 8c 92, Ultimate shear strength S us Permissible torsional stress τ A Endurance limit in shear τ e 87,8 6.7 Endurance limit by finite life τ f 87,8 6.8 Max. fatigue strength for the given loading τ max 98,6 6.9 Level of safety 1,063 τ max 195

5 τ ,6 87,8 τ 8c τ 1c τ min Supplements section Spring check calculation. Uploading of input data from main calculation Parameters of working cycle Maximum working loading F 8 100, Minimum working loading F 1 20, Spring working stroke H 1, Recommended limits of wire diameter d min / d max 0,1483 0, Wire diameter / from table d 0,1620 0, Outer / inner spring diameter D e / D i 1,4717 1, Spring index c 7.12 Permissible torsional stress τ A Corrected stress of fully loaded spring τ 8c 78, Level of safety Spring design stability Recommended minimum number of active coils n min 4, Number of active coils n 5, Theoretic spring limit length L 9 1, Recommended limits of free spring length L 0min / L 0max 2,7297 4, Free spring length L 0 3, Recommended pitch limits t min / t max 0,3929 0, Pitch of coils of free spring t 0, Minimum spring limit length L minf 1, Length of min. / max. loaded spring L 1 / L 8 3,4999 2, Compression of min. / max. loaded spring s 1 / s 8 0,2501 1, Permissible / actual max. working compression of spring ,33 [%] Transfer of solution into main calculation Calculation of working forces of the spring. Uploading of input data from main calculation Parameters of working cycle 8.3 Fully loaded spring length L 8 2, Preloaded spring length L 1 3, Spring working stroke H 1, Spring dimensions 8.8 Wire diameter / from table d 0,1620 0, Outer / inner spring diameter D e / D i 1,4717 1,1477

6 8.10 Spring index c 8.11 Number of active coils n 5, Free spring length L 0 3, Compression of min. / max. loaded spring s 1 / s 8 0,2500 1, Theoretic spring limit length L 9 1, Spring loading Maximum working loading F 8 100, Minimum working loading F 1 20, Permissible torsional stress τ A Corrected stress of fully loaded spring τ 8c 78, Level of safety Transfer of solution into main calculation Calculation of working lengths of the spring. Uploading of input data from main calculation Spring loading Maximum working loading F 8 100, Minimum working loading F 1 20, Spring dimensions 9.7 Wire diameter / from table d 0,1620 0, Outer / inner spring diameter D e / D i 1,4717 1, Spring index c 9.10 Number of active coils n 5, Free spring length L 0 3, Theoretic spring limit length L 9 1, Parameters of working cycle 9.14 Compression of min. / max. loaded spring s 1 / s 8 0,2500 1, Fully loaded spring length L 8 2, Preloaded spring length L 1 3, Spring working stroke H 1, Permissible torsional stress τ A Corrected stress of fully loaded spring τ 8c 78, Level of safety Transfer of solution into main calculation Graphical output, CAD systems D drawing output to: DXF File D Drawing scale Automatic 10.3 Spring length in the drawing and the model 2, Text description (Information for BOM) Row 1 (BOM attribute 1) Row 2 (BOM attribute 2) Row 3 (BOM attribute 3) Compression spring D=1,3097; d=0,162; n=5,5; L0=3,7 Music wire ASTM A Table of parameters