How to prevent self-tapping screws from being hardened and bent?

For those who frequently use self-tapping screws, it is obvious that self-tapping screws must be heat treated, which is what we usually call hardening. Due to the self-tapping screw or screw, it is used for drilling and tapping to achieve a tight connection, which requires the self-tapping screw itself to have a strong hardness so that it can function.

The self-tapping screw just produced, the wire hardness of the self-tapping screw itself is not enough to meet the customer's requirements. At this point we need to heat-treat the screw, that is, harden the screw. At the time, we tended not to pay attention.

During the hardening process, some tapping screws will bend, especially the appearance of long screws is less obvious. So, in this case, what should we pay attention to? How can we better prepare for this and reduce screw damage?

The heat treatment causes the tapping screws to bend, which is often caused by stacking problems of the heated tapping screws. The area of the long screw is large, and some screws are bent due to uneven stacking. Of course, there are many other factors that determine this.

For example, the furnace temperature rises too fast, the quenching temperature is too high, etc. are all variable bending factors. When the heating furnace temperature is too high, the critical point of the material is too large, which is prone to deformation.

Therefore, whether it is a hard factory or a consumer, we should understand that in the process of heat treatment and hardening of self-tapping screws, we should pay attention to the above points to prevent defective products or damage to the screws.