Ingilizce yay terminolojisi

Active coils (na)    Those coils which are free to deflect under load.

Angular relationship of ends    The relative position of the plane of the hooks or loops of extension springs to each other.

Baking    Heating of electroplated springs to relieve hydrogen embrittlement.

Buckling    Bowing or lateral deflection of compression springs when compressed, related to the slenderness ration (L/D).

Closed ends    Ends of compression springs where pitch of the end coils is reduced so that the end coils touch.

Closed and ground ends    Closed ends, except that the end is ground to provide a flat plane.

Closed length    See Solid height

Close-wound    Coiled with adjacent coils touching.

CNC    Computer numerical control (machinery).

Coils per inch    See Pitch

Deflection (F)    Motion of spring ends or arms under the application of an external load (P).

Elastic limit    Maximum stress to which a material may be subjected without permanent set.

Endurance limit    Maximum stress at which any given material will operate indefinitely without failure for a given minimum stress

Free angle    Angle between the arms of a torsion spring when the spring is not loaded.

Free length (L)    The overall length of a spring in the unloaded position.

Frequency (natural)    The lowest inherent rate of free vibration of a spring itself (usually in cycles per second) with ends restrained.

Gradient    See Rate (R)

Heat setting    Fixturing a spring at elevated temperature to minimize loss of load at operating temperature.

Helix    The spiral form (open or closed) of compression, extension, and torsion springs.

Hooks    Open loops or ends of extension springs

Hot pressing    See Heat setting

Hydrogen embrittlement    Hydrogen absorbed in electroplating or pickling of carbon steels, tending to make the spring material brittle and susceptible to cracking and failure, particularly under sustained loads.

Hysteresis    The mechanical energy loss that always occurs under cyclic loading and unloading of a spring, proportional to the area between the loading and unloading load deflection curves within the elastic range of a spring.

Initial tension (P1)    The force that tends to keep the coils of an extension spring closed and which must be overcome before the coils start to open.

Load (P)    The force applied to a spring that causes deflection (F).

Loops    Coil-like wire shapes at the ends of extension springs that provide for attachment and force application.

Mean coil diameter (D)    Outside spring diameter (OD) minus one wire diameter (d).

Modulus in shear or torsion (G)    Coefficient of stiffness for extension and compression springs.

Modulus in tension or bending (E)    Coefficient of stiffness used for torsion and flat springs (Young's Modulus).

Moment    See Torque

Open ends, not ground    End of a compression spring with a constant pitch for each coil.

Open ends, ground    Open ends, not ground followed by an end grinding operation.

Passivating    Acid treatment of stainless steel to remove contaminants and improve corrosion resistance.

Permanent set    The condition of a material that is deflected so far that its elastic properties have been exceeded and it does not return to its original condition upon release of load.

Pitch (p)    The distance from center to center of the wire in adjacent active coils (recommended practice is to specify number of active coils rather than pitch).

Preset    See Remove set

Rate (R)    Change in load per unit deflection, generally given in pounds per inch. (N/mm)

Remove set    The process of closing to solid height a compression spring which has been coiled longer than the desired finished length, so as to increase the apparent elastic limit

Residual stress    Stresses induced by set removal, shot peening, cold working, forming or other means. These stresses may or may not be beneficial, depending on the application.

Set    Permanent distortion which occurs when a spring is stressed beyond the elastic limit of the material.

Shot peening    A cold-working process in which the material surface is peened to induce compressive stresses and thereby improve fatigue life, and also for surface cleaning.

Slenderness ratio    Ratio of spring length (L) to mean coil diameter (D).

Solid height (H)    Length of a compression spring when under sufficient load to bring all coils into contact with adjacent coils.

Spring index (C)    Ration of mean coil diameter (D) to wire diameter (d).

Squared and ground ends    See Closed and ground ends

Squared ends    See Closed ends

Squareness of ends    Angular deviation between the axis of a compression spring and the plane of the ends.

Squareness under load    Squareness of ends, except with the spring under load.

Stress range    The difference in operating stresses at minimum and maximum loads.

Stress relieve    To subject springs to low-temperature heat treatment so as to relieve residual stress.

Torque (M)    Twisting action in torsion springs which tends to produce rotation equal to the load multiplied by the distance (or moment arm) from the load to the axis of the spring body.

Total number of coils (Nt)    Number of active coils (na) plus the coils forming the ends.

Wahl Factor    A factor to correct stress in helical springs effects of curvature and direct shear.