Screw fasteners commonly used processing technology

Release time:

2023-09-07

Screw fasteners, as a key component widely used in daily life, whether it is airplanes, high-speed trains, automobiles, or mobile phones, watches, glasses, etc., are inseparable from their existence. Screw fasteners play an important role in promoting our lives and economic development, so how is their manufacturing process achieved?

What is craft?

Process is the method and process by which workers use production tools to process or process value-added raw materials and semi-finished products, and finally make them into finished products.

In the production process of screw fasteners, our common processes are:

01 Annealing

The wire is heated to an appropriate temperature, maintained for a certain period of time, and then slowly cooled to adjust the crystalline structure, reduce the hardness, and improve the normal temperature processability of the wire.

02 Wire drawing

In metal pressure processing. Under the action of external force, the metal is forced through the mold, the cross-sectional area of the metal is compressed, and the required cross-sectional area shape and size are obtained.

03 Cold Heading

Cut the wire, upset into screw blanks, form the head, make cross groove (or other head type) thread blank diameter and rod length, round corner under the head, etc.

04 Rubbing silk

The formed semi-finished product is rolled or tapped to achieve the desired thread. In practice, bolts (screws) are called grinding teeth, tooth strips are called rolling teeth, and nuts are called tapping teeth.

05 Heat Treatment

Strengthen the strength, hardness and toughness of its screws. A good screw should not be too hard-it will break easily when locked, and not too soft-it will lock easily. It is not tight, so heat treatment is necessary for the screw to have the flexibility of the outer steel.

06 Surface treatment

Surface treatment is the process of forming a covering layer on the surface of the workpiece through a certain method, the purpose of which is to give the surface of the product beautiful, anti-corrosion effect.

The final inspection and selection of screw fasteners is the last confirmation and check of all the work in the previous sequence. This process is followed by packaging and warehousing. Screw fastener manufacturers usually manually select defects such as effusion and bruises. The optical screening machine detects and selects defects such as size, thread-free and oblique teeth.