Manufacture of the hottest spiral tension torsion

Manufacturing of spiral tension and torsion springs

I. cylindrical coil spring structure

cylindrical coil springs have three types according to the force nature:

1 Cylindrical spiral compression spring

1) the spacing of each coil of the spring

set the pitch of the spring as p; The diameter of spring wire is D; In the free state, there should be proper spacing between the circles δ。 In order to maintain a certain elasticity of the spring after compression, it should also ensure that there is still a certain distance between the coils under the maximum load δ 1。 δ The size of 1 is generally recommended as: δ 1=0.1d ≥ 0.2mm

2) dead circle

the two end rings of the spring are tight with the adjacent ring (no gap), which only plays a supporting role and does not participate in deformation, so it is called dead circle. When the number of working coils of the spring n ≤ 7, the dead coil at each end of the spring is about 0.75; When n>7, the dead circle at each end is about 1 ~ 1.75. Localization of Korean decoration materials: perforated plastic tiles come out

3) end structure form

yi type: both end rings are close to the adjacent ring and ground flat on a special grinder

yii type: when heating and winding, both ends of the spring wire are forged flat and tight with the adjacent ring (the end ring can be ground flat or not)

yiii type: both end rings are tight with the adjacent rings and do not grind flat

in important occasions, Yi type should be used to ensure that the two supporting end faces are perpendicular to the axis of the spring, so that the spring will not skew when pressed. When the spring wire diameter D ≤ 0.5mm, the spring 18. Net weight: 1900kg. The two supporting end faces of the spring do not need to be ground flat. d> For the spring of 0.5mm, the two bearing end faces need to be ground flat. The ground part shall not be less than 3/4 of the circumference. The thickness of the end is generally not less than d/8, and the roughness of the end face should be less than

2. Cylindrical spiral tension spring

1) end hook type

tension spring in order to facilitate connection, fixation and loading, hooks are made at both ends

li and Li hooks are easy to manufacture and widely used. However, due to the large bending stress at the hook transition, it is only suitable for 5. Limit protection: it has two-level limit protection functions of mechanical and program control; In the spring with spring wire diameter D ≤ l0mm

lvii and LVIII hooks are not connected with the spring wire, so there is no defect of the above transition, and this kind of hook can be turned to any direction, which is convenient for installation. Lvii type hook is best used in the occasion with large stress, but its price is relatively expensive

2) tension spring with prestress

when the cylindrical spiral tension spring is empty, each circle should be close to each other. In addition, in order to save the axial working space and ensure that the coils of the spring are pressed against each other when it is unloaded, the spring wire is often twisted around its own axis during the winding process. The spring made in this way has a certain pressing force between the coils and a certain prestress in the spring wire, so it is called. This kind of spring must not separate until the applied tension is greater than the initial tension F0, so it can save axial working space compared with non prestressed tension spring

3. Spiral torsion spring

torsion spring. In order to facilitate connection, fixation and loading, lever arms are made at both ends:

(II) manufacturing of cylindrical spiral spring

manufacturing process of spiral spring includes: a) rolling; b) Manufacture of hook or finish machining of end ring; c) Heat treatment; d) Process test and pressure are in some emerging industries and new fields

rolling refers to winding the spring wire that meets the technical conditions on the mandrel. In mass production, it is rolled on the universal automatic spring coiler; For single piece and small batch production, it is rolled on an ordinary lathe or a manual winding machine

there are two kinds of coiling: cold coiling and hot coiling. Cold coil is used for diameter D drawn after pre heat treatment