Spring-the process of cold forming

There are two types of spring manufacturing methods: cold-rolling method and hot-rolling method. Under normal circumstances, the spring wire with a diameter of less than 8 mm generally uses the cold coil method, and the spring wire with a diameter of more than 8 mm uses the hot coil method. Some springs need to be subjected to strong pressure or shot peening after they are made to improve the load-bearing capacity of the springs.
One-time automation capability of the spring cold forming process. The cold forming machine has now developed to 12 jaws. The steel wire 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:
①Improve 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.
When using materials that do not need to be quenched and tempered to make a spring after forming, the process is
Spiral compression spring: coiling, stress relief annealing, grinding on both ends, (shot blasting), (aligning), (stress relief annealing), standing or pressure treatment, inspection, surface anticorrosion treatment, packaging.
Spiral tension spring: coiling, stress relief annealing, hook and loop production, (tail trimming), stress relief annealing, standing treatment, inspection, surface anticorrosion treatment, packaging.
Spiral torsion spring: coiling, stress relief annealing, torsion arm making, tail trimming, stress relief annealing, standing treatment, inspection, surface anticorrosion treatment, packaging.
When using materials that need to be quenched and tempered after forming, the main difference from the above process is that they need to be quenched and tempered after forming. Sometimes the spring end processing needs to be normalized.
Generally speaking, spring manufacturing materials should have high elastic limit, fatigue limit, impact toughness and good heat treatment performance, etc. Commonly used are carbon spring steel, alloy spring steel, stainless spring steel, copper alloy, nickel alloy and rubber Wait.