What are the precautions for spring processing?
What do you need to think about in the process of spring processing? Today Zhuhai Loncin Technology will tell you
1. Springs without support rings and springs with too thin steel wire diameters should not be welded to the spring head, but the end cable should not be significantly loose, and should be deburred. For multi-strand springs that need to be welded to the head, the length of the welded part should be less than 3 times the cable diameter (the longest is no more than 10 mm). The heating length should be less than one circle, and it should be polished smoothly after welding, and the welding part should be locally annealed at low temperature during gas welding.
2. The support ring can choose two methods: cold and hot, according to product requirements. It is not allowed to heat the spring to sparking or whitening by using the heat-parallel method, and the temperature of the silico-manganese steel shall not be higher than 850°C. The support ring and the effective ring should be in effective contact, and the gap should not exceed 10% of the nominal gap between the rings.
3. The characteristics of the multi-strand spring can be determined by the adjustment lead, and the cable distance can be adjusted as necessary during winding. The twisting distance can be 3~14 times the steel wire diameter, but generally 8~13 times is better. The spring force is also closely related to the free height, the end ring, the outer diameter and the performance of the steel wire. It can be changed by adjusting one or several of them.
4. The pressing time of important springs is 24 hours, and that of ordinary springs is 6 hours or continuous compression 3~5 times, each time holding for 3~5 seconds. The gap between the spring and the mandrel during compression is preferably 10% of the diameter of the mandrel. If the gap is too small, it is difficult to operate, and if the gap is too large, the spring is likely to be bent and deformed. If one of the springs breaks during compression, the rest should be processed again.
5. For multi-strand springs with a large H0/D2 value, attention should be paid to their deformation during heat treatment, whether to wear the mandrel and the placement method should be considered, and appropriate heat treatment equipment should be selected. Under the repairable condition, tempering and hot pressing can be carried out many times to achieve the purpose.
6. The spring surface treatment is generally phosphating treatment, but other treatments can also be carried out. Where zinc and cadmium are to be coated, the hydrogen removal treatment should be carried out after electroplating, and 3% (not less than 3 pieces) shall be drawn after the removal of hydrogen to retest the standing treatment, and there shall be no breaks in the retest. The spring should be cleaned of surface dirt, salt marks, and oxide scale. The method can be sand blowing or gasoline cleaning, but acid cleaning is not allowed.
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