2. Classification of truncated conical coil springs Truncated conical coil springs can be divided into two types: equal pitch type and equal helical rise Angle type. The cross-section of their material is circular. (1) Conical coil spring with equal pitch (Figure 12-3-2) Figure 12-3-2 Equal pitch truncated conical coil spring The axis of its spring…
1. Structural form and characteristics of truncated conical helical spring The spiral spring with the shape of a truncated cone is called the truncated cone coil spring, and the truncated cone coil spring is generally a compression spring. Its structure and characteristic lines are shown in Figure 12-3-1 Figure 12-3-1 Structure and characteristic lines of…
7.3 Calculation Examples of rectangular compression springs Table 12-2-38 Projet Unit Formulas and data Original condition Outer diameter D2 mm 48 Maximum working load Pn N 1500 Deformation under maximum working load Fn mm 35.2 Load class Class II End structure The end of the compression spring is tight and smooth, and the supporting ring…
Parameters of compression spring with rectangular section Table 12-2-37 Item Formulas and data Rotation ratio C C=D/a,Where a is the length of the side of the rectangular hiding surface material perpendicular to the spring axis a 0.2~0.4 0.5~1 1.1~2.4 2.5~6 7~16 18~50 C 4~7 5~12 5~10 4~9 4~8 4~6 b/a and a/b values When…
7.1 Calculation formula of rectangular section cylindrical spiral compression spring Load deformation diagram of rectangular cross-section compression spring Table 12-2-36 Calculation formula of rectangular section cylindrical helical compression spring Project Unit Formulas and data Maximum working load Pn N Pn=(ab√ ab/βD)Tp=b√ ab/βCTp In the formula, C=D/a, Retrieved from Tables 12-2-37 β Is the coefficient, obtained…
Rectangular cross-section cylindrical spiral compression spring Compared with circular cross-section cylindrical spiral compression springs, rectangular cross-section cylindrical spiral compression springs have a larger cross-sectional area in the same space, thus absorbing more energy and can be used as heavy-duty springs with high stiffness requirements. On the other hand, the characteristic curve of a rectangular cross-section…
6.5 Technical requirements for cylindrical spiral springs Springs made of cold drawn steel wire quenched in a lead bath and formed by cold rolling should generally undergo stress relieving tempering treatment. The specifications for stress relieving tempering treatment are shown in Table 12-15-5. Springs formed by annealing or hot rolling (with large material diameter and…
6.4 Manufacturing accuracy and limit deviation of cold rolled cylindrical spiral torsion spring Table 12-2-35 Project Spring manufacturing accuracy and limit deviation Limit deviation of torque △T/N*mm ±(Calculate torsion angle×β1×β2)×T’ Accuracy Level 1 2 3 β1 0.03 0.05 0.08 Coil >3~10 >10~20 >20~30 β2/(°) 10 15 20 Spring outer diameter D2 Limit deviation △D2/mm Winding…
6.3 Manufacturing accuracy and limit deviation of hot-rolled cylindrical spiral springs Table 12-2-34 Project Spring manufacturing accuracy and limit deviation Limit deviation of height at specified load△H/mm The minimum calculated deformation (mm) at a specified height of ± [1.5mm ± x3%] should be 1% of the free height Ultimate deviation of load at specified height…
6.2 Manufacturing accuracy and limit deviation of cold rolled cylindrical spiral tension springs Table 12-2-336 Project Spring manufacturing accuracy and limit deviation When specifying the length, the limit deviation △ P/N of load P (when the accuracy level of the effective circle is bigger than 3) ± [initial tension] ×α+ (Load at specified length…
6.1 Manufacturing accuracy and limit deviation of cold rolled cylindrical spiral compression springs Table 12-2-32 Project Spring manufacturing accuracy and limit deviation Limit deviation of load P at specified height△P/N Effective coils n ≥3~10 ＞10 accuracy class 1 ±0.05P ±0.04P 2 ±0.10P ±0.08P 3 ±0.15P ±0.12P Limit deviation of spring stiffness P’ △P’/N.mm-1 Effective coils…
Application examples of cylindrical spiral torsion springs 1) Figure 12-2-8 shows the application of torsion spring in electromechanical Force meter. When the torque M of the measured force F to the rotating shaft O-O is balanced with the spring torque MF of the torsion spring, the measured force F can be measured and expressed by…
5.3 Installation and structure example of cylindrical spiral torsion spring See Table 12-2-31 for an example of the installation and structure of the spiral torsion spring. Except for the indicated inner arm structure, the rest are outer arm structures. Table 12-2-31 Example of torsion spring installation and construction
5.2 Calculation example of cylindrical spiral torsion spring Table 12-2-30 Parameter Unit Corporate and data Original conditions Minimum working torque T1 Maximum working torque Tn Working torsion angle φ Spring category End structure Free angle N.mm N.mm (°)(°) 2000 6000 40 N<103 Outer arm torsion 120 Parameter calculation Selection of materials and allowable bending stress σBp…
5.1 Calculation formula of cylindrical helical torsion spring Table 12-2-29 Project Unit Formula and Data Material diameter d mm d≥³√ 32TnK1/πσBp Where σBp – allowable bending stress,Check according to Table 12-2-6.K1=(4C-1)/(4C-4),Or check according to Table 12-2-20 Effective coils n Coil n=Ed4φ/3667D(Tn-T1) Where E – elastic modulus Stiffness T’ N.mm/(°) T’=Ed4φ/3667Dn Minimum working torque T1 N.mm…