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Snap Cap The key steps
Sep 11, 2017

The key steps in the process of capping

Heat treatment process can improve performance, mechanical equipment in the industrial production in the position of irreplaceable, Snap Cap and steel microstructure is also the most complex, so a wide range of heat treatment process, annealing, normalizing, quenching, tempering heat treatment is the "four The fire ", Snap Cap this article mainly in-depth exploration of the process of handling a card-fire - annealing.

As shown in Fig. 1, Snap Cap complete annealing is also known as recrystallization annealing, generally referred to as annealing, which is often used as a final heat treatment for some unimportant workpieces or as a preheating of certain workpieces.

2, ball annealing is mainly used for eutectoid carbon steel and alloy tool steel, its main purpose is to reduce the hardness, improve the machinability, and for the future to prepare for quenching.

3, to stress annealing, Snap Cap also known as low-temperature annealing, this technology in the process of processing the card cap annealing is mainly used to eliminate castings, forgings, welding parts, Snap Cap hot-rolled parts, cold drawn parts and other residual stress. If these stresses are not eliminated, it will cause the steel to deform or crack after a certain period of time, or during subsequent cutting. One of the complete annealing and spheroidizing annealing are closely related, both in the use of close, Snap Cap inseparable.

What are the corrosive properties of the cap protective layer?

Many types of metal protective layer, the spring, the general is to use gold plating method to obtain metal protective layer. Electroplated protective layer not only protects against corrosion, Snap Cap but also improves the appearance of the spring. Some electroplated metals can also improve the performance of the spring, such as improving the surface hardness, increased wear resistance, improve thermal stability, prevent radiation corrosion. But if simply for the corrosion of the cap, the general should use galvanized layer and electroplated cadmium layer.

Zinc in the dry air more stable, Snap Cap almost no change, not easy to change color. In the humid air will produce a layer of zinc oxide or carbon zinc carbonate white film. This layer of dense film can prevent continued corrosion. So the galvanized layer for the spring in general atmospheric conditions corrosion protection layer. Where with sulfuric acid, hydrochloric acid, Snap Cap caustic soda and other solutions in contact, and in the atmosphere of sulfur dioxide and other humid air work in the spring, are not suitable for zinc coating.

In the ocean or high temperature atmosphere, as well as with the sea water in the spring, 70 ℃ hot water used in the spring, cadmium more stable, Snap Cap strong corrosion resistance. Cadmium coating than the zinc coating bright and beautiful, soft, plastic than zinc is good, the coating hydrogen embrittlement is small, the most suitable for the spring as a protective layer. But cadmium scarce, Snap Cap expensive, and cadmium salt toxicity, the environmental pollution is very powerful. Therefore, the use of restrictions. Snap Cap So most of the aviation, navigation and electronics industry only used in the cap of the cadmium coating as a protective layer.


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