The Manufacturing Process of Bi-Metal Screws

Here’s an overview of how bi-metal screws are made:

1.Head Forming (Stainless Steel):

The first step is to form the head of the screw using stainless steel. Molds are used to shape the material into the desired screw head form.

2. Welding:

The stainless steel head is then welded to the alloy steel tail, and an inspection process confirms the weld is strong and safe.

3. Pointing:

The tail end, made from alloy steel, is formed into the required shape using advanced forming processes.

4. Thread Rolling:

The screw's threads are created by rolling the workpiece, giving the bi-metal screw the threading necessary for its applications.

5. Heat Treatment:

Heat treatment is applied to enhance the firmness and hardness of the alloy steel portion.

6. Surface Treatment:

Finally, the screws undergo surface treatments like plating or painting to improve rust resistance and appearance.