Precautions in the processing of Kunshan spring factory

1, without the support ring of the spring and steel wire diameter is too thin spring should not be welded spring head, but the end of the steel wire should not be obviously loose, should be deburred. Where the need to weld the head of the multi-stranded spring, the length of the welded part should be less than 3 times the diameter of the cable (the longest length is not greater than 10 mm). Heating length should be less than a circle, after welding should be polished smooth, gas welding welding parts should be localized low-temperature annealing.

2, support ring according to the product requirements can be selected cold and hot and two methods. Adopt hot and do not allow the spring heating to spark or white, silicon manganese steel temperature shall not be higher than 850 ℃. Support circle and effective circle should be effective contact, the gap shall not exceed 10% of the nominal gap between the circle.

3、Multi-stranded spring characteristics can be determined by adjusting the lead, winding the cable distance can be adjusted as necessary. Screwing distance can be taken 3 ~ 14 times the diameter of the wire, but generally take 8 ~ 13 times better. The spring force is also closely related to the free height, and the end of the circle, the outer diameter and wire performance, etc., can be changed by adjusting one or more of them.

4, the important spring compression time of 24 hours, ordinary springs for 6 hours or continuous compression of 3 ~ 5 times, each time to keep 3 ~ 5 seconds. Tighten the spring and mandrel clearance to 10% of the diameter of the mandrel is appropriate, the gap is too small is difficult to operate, the gap is too large is easy to make the spring bending deformation. If one of the springs breaks when tightening, the rest should be reprocessed.

5, for H0 / D2 value of the larger multi-stranded spring, in the heat treatment should pay attention to its deformation, consider whether to wear the mandrel and should pay attention to the way of placement, the choice of appropriate heat treatment equipment. Repair conditions can be carried out under the conditions of multiple tempering and hot pressing to achieve the purpose.

6, spring surface treatment is generally phosphating treatment, can also be other treatments. Where to be plated with zinc and cadmium, plating should be dehydrogenated, dehydrogenated draw 3% (not less than 3 pieces) retesting standing treatment, retesting shall not be fractured. Spring should be removed from the surface dirt, salt scars, oxide skin, the method can be used to blow sand or gasoline cleaning methods, but can not be used to pickling.