Processing Flow of Cold Headed Screws

The cold headed screws processing flow is a complex and meticulous process, which can be mainly divided into the following key steps:

Material Preparation and Pretreatment

Material Selection

Firstly, based on the specifications and requirements of the cold headed screws, select suitable metal materials such as carbon steel, alloy steel, or stainless steel. These materials need to have good plasticity and processing performance.

Pretreatment

Pretreat the selected wire rods or bars, including cleaning, rust removal, annealing, etc. The annealing process aims to adjust the crystalline structure of the material, reduce hardness, and improve room-temperature workability. Meanwhile, pickling is used to remove oxide films and impurities from the surface of the wire, creating favorable conditions for subsequent processing.

Cold Heading Forming

Cutting and Feeding

Feed the pretreated wire rods or bars into the cold heading machine, where the cutting mechanism cuts them into billets of the required length. This process needs to ensure the length and dimensional accuracy of the billets to meet the requirements of subsequent processing.

Forming

In the cold heading machine, the billets undergo multi-station sequential processes to complete heading, accumulation, forming, and other stages. During the cold heading process, the precision of the mold and the performance of the press are crucial to the quality and production efficiency of the products. Through the pressing and shearing action of the mold, the billets gradually deform into the preliminary shape of screws.

Refinement

For screws requiring higher precision, further refinement processes such as chamfering, threading, reducing diameter, and trimming are necessary. These procedures aim to enhance the surface quality and geometric dimensional accuracy of the screws.

Post-Processing and Inspection of Cold Headed Screws

Heat Treatment

To improve the hardness and strength of the cold headed screws, heat treatment is required for the formed products. The heat treatment method depends on the material type and performance requirements, with common methods including quenching and tempering.

Surface Treatment

To prevent rust and corrosion of the cold headed screws, surface treatments such as galvanizing, oxidizing, and painting are necessary. These treatment measures can significantly enhance the corrosion resistance and aesthetic appeal of the products.

Inspection and Packaging

Finally, the processed cold headed screws undergo strict dimensional inspection and performance testing to ensure they meet design requirements. Qualified cold headed screws are then packaged and stored, ready for shipment and sale or use.

The cold headed screws processing flow is a comprehensive production process that integrates material preparation, cold heading forming, post-processing, and inspection. Each step requires strict control of process parameters and quality standards to ensure the quality and performance of the final product.