1) One time automation ability of cold forming process. The cold forming machine has been developed to 12 claws. The steel wire in the range of (0.3-14) mm can be formed at one time in 8-claw forming machine. The development direction of forming process equipment: ① to improve the forming speed, the main development trend is to improve the forming speed of equipment, that is, consumption efficiency; ② to improve the durability of equipment by improving the fineness of equipment parts and strengthening the heat treatment effect; ③ adding length sensor and laser distance meter to stop the automatic closed-loop control manufacturing process for CNC forming machine. 2) The range of cold forming process is. The spring coiler with large wire diameter has a maximum specification of 20 mm, = 2000 MPa and a winding ratio of 5. The cold forming process of minic block spring and eccentric spring with variable diameter or equal diameter is still limited.
1) The speed of hot forming process is very high. In China, only CNC2 shaft hot coiling machine is used for forming (9 ~ 25) mm specifications, and the maximum speed is 17 pieces per minute. Compared with the prosperous countries, there is a big gap. 2) The technology control ability of large spring hot forming. Because there is only CNC2 axis hot coiling spring machine, the shape control is less than three directions, and the precision is poor; and there is no automatic bar rotation control and adjustment mechanism, so the forming process degree and ability of hot coil spring are low. Therefore, the accuracy of the spring and the surface oxidation decarburization degree are also low.