The manufacture of spiral extension spring, torsion spring, at that time with a few factories in introducing foreign CNC CNC spring forming machine last automatic forming of various styles of tensile and torsional spring. Most manufacturers still use the traditional machining method to manufacture, the following brief introduction

1, screw tensile spring. Their skills and spiral compression spring terminals are the same, different is just the end of the hook ring processing, tensile spring forming method is as follows:

1) with the same as the spiral compression spring, the method of winding shaping after the stress relieving, and then to shackle processing, in addition to the special shape of the hook ring or need to pull in the early high tensile spring spiral rolled with lathe by rolling or craft, greatly all spring is rolled with automatic spring coiling machine.

2) use rolled straight spring coiling machine. It is a kind of spindle vertical made a spring mechanism. After rolling the stress relieving, and then to shackle processing. Many screw tensile spring end structure way, also many processing methods. Commonly used are: small spring use pliers type special things or special skills, equipment craft processing; General screw tensile spring with hook device or mold with manual or automatic operation methods for processing; Long arm extension spring shackle, general is long and winding required to set aside retractor or rolling processing set aside after the required number of turns, the two ends with straightening things straight, and then bending hook ring with anything special. The stress relieving skills standards as mentioned above. Spring coiling to go after good stress relieving, then block and shackle processing, shackle processing is completed, the general again for 1 ~ 2 times the stress relieving. In order to avoid two carabiners relative Angle changes, therefore, when the stress relieving to shackle is processed temperature is better than rolling after the low temperature of 20 ~ 30 ° C. Tensile spring is generally not spiral shot blasting and strong disposition.

2, spiral spring. Its skills and spiral compression spring, tension spring terminals are the same, different is also the end of processing. In small batch production and torsion arm more complex cases, most choose craft or semi-automatic intentional shaft coiling spring into legal system, and then install fixture will twist the arm of employment according to the need to carry on the processing. Produced in large quantities, can be in straight tail volume spring machine and the torsion spring machine, torsion arm cannot end according to the pattern, and labor division of sequence, jig for processing. According to the characteristics of the spiral spring changes in planning and manufacturing, should also pay attention to the following two points:

1) spiral spring end twisting arms should be produced from a forming, avoid machining made of plastic. Twisting arms after processing should be 2 times to stress annealing;

2) the time of the helical spring is close circle more, this occurred between spring coil is equal to the drawing tension at the beginning of the spring similar compression force, the loading and unloading happens when the friction force and appear lags behind appearances, when load and rotate to the same or laps increases, the tendency to increase; Also brings to the surface treatment process. So when planning and forming, between the spring coil should be slightly left blank. In a lot of produce, manufacturers in the conditional case, the changes of spiral extension spring, the spring in the open, bending, such as hook procedure, can choose the hydraulic, pneumatic and other methods for processing.