How to prevent self – tapping screw from hardening and bending?

Self-tapping screws are generally fingertip screws, coarse teeth, hard wood screws, aluminum alloy, plastic screws.

A special kind of self – tapping screw used to thread metal holes is called a tap.

Self-tapping screws are used for non-metal or soft metal, without bottom hole and tapping;

Self-tapping screw is pointed, so that it can “self-tapping”; Ordinary screws are flat head, uniform thickness.

Self-tapping screw is: drilling holes without tapping holes, screw and the general is different, the head is pointed, tooth spacing is relatively large, and no chip wire tapping is a bit like, can not tap teeth directly screw in, metal and plastic usually use this method.

It can be in the consolidated material, by its own thread, will be consolidated body “tap – drill, squeeze, pressure” out of the corresponding thread, so that it closely cooperate with each other.

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How to prevent self – tapping screw from hardening and bending?

For people who commonly use self-tapping screws are clear, self-tapping screws must be heat treated, which is what we often say hardening.

Because self-tapping screw or screw, it is used for tapping, tapping and fastening the connection, which requires self-tapping screw itself should have a strong hardness, so that it plays a role.

The hardness of the wire of the newly produced self-tapping screw is not enough to meet the customer’s requirements.

At this time, we need to go through the heat treatment of the screw, that is, the stiffening of the screw.

At that time, often in the case that we do not pay attention to, in the hardening process, some self-tapping screws will bend, especially the occurrence of long screws is not obvious.

So in this case, what should we pay attention to when hardening? How can we better prevent the occurrence of this situation and reduce the damage to the screws?

Heat treatment leads to bending of self-tapping screws, which is often in the stacking problem of heating self-tapping screws.

The area of long screws is large, and the screws are heated unevenly in part due to stacking, so as to bend.

Of course, besides this reason, there are some other factors. For example, the furnace temperature is rising too fast, the quenching temperature is too high and so on are the bending factors, the temperature in the furnace exceeds the critical point of the material too much, it is easy to deformation.

Therefore, whether it is the hardening factory or the consumer, we should understand that the above points should be paid attention to when the self-tapping screw is hardened in the heat treatment, in order to prevent the generation of defective products or damage the screw.