Development of spring processing technology in Datong

At present, the processing equipment and production line of Datong spring are developing towards the depth and breadth of numerical control (NC) and computer control (CNC). However, with the change of Datong spring material and geometry, the processing technology has also developed.

1) The suspension Datong spring with variable outer diameter, variable pitch and variable steel wire diameter (three variable) realizes non molding processing. Since the development of three variable Datong spring, tapered steel bar has been used in CNC lathe winding processing, but the yield and price are not ideal. At present, under the heating state, the roller speed and drawing force are controlled by the spring coiler to obtain the required cone shape, and the processing waste heat is used for quenching.

2) The hollow stable Datong spring rod is made of low carbon boron steel plate and welded.

3) The torsion bar is made of 45 steel with high purity. High hardness and large residual compressive stress can be obtained by high frequency quenching, so as to improve fatigue life and anti relaxation ability.

4) The sheet spring widely used in electronic products is basically formed by stamping and automatic bending. At present, it is mainly to develop the joint technology of composite materials.

(1) Cold forming process of Datong spring

1) One time automation ability of cold forming process. Cold forming machine has been developed to 12 claws. The steel wire in the range of (0.3-14) mm is basically formed at one time by 8-jaw forming machine. At present, the development direction of forming process equipment is as follows: ① to improve the forming speed, the main development trend is to improve the forming speed of the equipment, that is, the production efficiency; ② to improve the durability of the equipment by improving the precision of the equipment parts and strengthening the heat treatment effect; ③ to increase the length sensor and the laser rangefinder, to carry out the automatic closed-loop control of the manufacturing process for the CNC forming machine.

2) Cold forming process range and capability. At present, the maximum specification of large diameter Datong spring coiler can reach 20mm, = 2000mPa, and the winding ratio is 5. The cold forming process of mini block Datong spring and eccentric Datong spring with variable or equal diameter material is still limited.

(2) Hot forming process of Datong spring

1) Speed capability of hot forming process. At present, there is only CNC2 axis hot spring coiler in China, with a maximum speed of 17 pieces per minute. Compared with developed countries, there is a big gap.

2) Datong spring hot forming process control ability. Because there is only CNC2 axis hot coil spring machine, the shape control is less and the accuracy is poor, and there is no automatic bar rotation control and adjustment mechanism, so the level and ability of hot coil spring forming process is low. Therefore, the accuracy level and surface oxidation decarburization level of Datong spring are also low.

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