Generally speaking, the manufacturing materials of springs should have high elastic limit, fatigue limit, impact toughness and good heat treatment performance. Commonly used are carbon spring steel, alloy spring steel, stainless spring steel, copper alloy, nickel alloy and rubber. Wait.
There are cold-rolling methods and hot-rolling methods for springs. Cold-rolling methods are generally used for spring wire diameters less than 8 mm, and hot-rolling methods are used for spring wire diameters greater than 8 mm. Some springs must be subjected to strong pressure or shot peening after they are made. Can improve the load capacity of the spring.
Spring cold forming process one-time automation capability. The cold forming machine has been developed to 12 jaws. Steel wires in the range of (0.3~14) mm can basically be formed at one time by the 8-jaw forming machine. The current development direction of forming process equipment:
①Increase the forming speed, the main development trend is to increase the forming speed of the equipment, that is, the production efficiency; ②Improve the durability of the equipment by improving the precision of equipment parts and strengthening the effect of heat treatment; ③Increase the length sensor and laser rangefinder to form CNC The machine performs automatic closed-loop control of the manufacturing process.
Cold forming process range capability. At present, the maximum specification of large wire diameter spring coiling machine can reach 20mm, 2000MPa, and the winding ratio is 5. The cold forming process of variable diameter or equal diameter material Minic-Block spring and eccentric spring still has limitations.