compression springWhat is a compression spring?One of the most famous and widely used types of springs is the compression spring. This type of spring is used in more industries than other springs and it can be said that 50-60% of the springs produced are of this type. The compression spring is developed from a simple rod that is spiraled to bear the load axially to make full use of the space. The compression spring can be produced in different sizes and thickness according to the customer's demand. The distance between the circles constitutes this spring; As a result of the pressure, the circles come closer together and by compressing or applying force to both sides, it performs its task. Compression springs are produced with advanced devices that have a precise control system, and at the end of production, the springs are uniformly crushed. Compression springs are produced by wires with different cross-sections such as curved, square, rectangular or other special sections. Generally, compression springs with a circular cross-section are more useful. Spring index: The spring index is a parameter for the spring designer; Because it shows how tightly the spring is wrapped. It is very difficult to produce springs with very low and very high index values in practice. An index with a low value indicates a spring with very high stiffness and a wire or rod with a relatively large diameter or a relatively small ring diameter is wrapped. This type of spring has a very high axial stiffness (rate). A high value index indicates an open wound spring that has high flexibility along its axis, i.e. low spring stiffness. Types of spring ends: Light compression springs (cold rolled) are generally divided into four categories based on the type of end, the use of each of which depends on the type of end. 1) Two closed ends 2) Both ends are closed and stoned 3) Two simple ends 4) Two simple ends are stoned In a spring with two closed ends, the end ring is closed so that the tip of the end ring contacts the previous ring, creating more stability in its seat. The spring with two closed and stoned ends is the most stable type of closed end spring. The end shape is actually closed like the end type and is stoned in a separate operation after looping at the ends of both sides. The spring with two simple ends is cheaper than the others and has the most efficiency in terms of occupying space. Because there is no inactive material at the end of the loop. When the end of the spring is stoned, surfaces are created that have a rectangular shape, smooth and parallel to each other, and these changes affect the performance of the spring. Therefore, tolerances should be checked in them when necessary. Number of rings: In a compression spring, the number of rings has a direct effect on the stiffness of the spring and its package length. The number of rings is an important parameter in the calculation related to spring design, which includes three different coefficients: 1-Total number of loops:The total number of loops in a spring, measured from the tip of one loop to the tip of another loop, including fractions of a loop. 2-Number of inactive loops:There are a number of rings in the spring that do not spring during loading and do not contribute to the stiffness of the spring. Inactive rings are generally the end rings of the spring. 3-Number of active loops:Active rings are the rings that contribute to the stiffness of the spring. The number of active loops is obtained by subtracting the inactive loops from the total loops. The initiative of the spring industry, taking into account such things as: 1) Consumables include carbon steels, alloy anti-rust and phosphor bronze 2) Wire diameter from 0.1 mm to 32 mm 3) Round, oval, square cross section 4) Additional possibility of compression spring including grinding, shot peening, protective coating 5) Production circulation from 1 to millions 6) Manufacturing tolerance based on DIN2095 standard or specifications desired by the customer