Common sense of fasteners: analysis of the difference between cold heading nuts and pad heading nuts

Cold heading: It is the use of metal plasticity to apply pressure or cold drawing with cold mechanics to achieve the purpose of metal solid deformation.

The forging method of thickening the top of a bar or wire at room temperature. Cold heading is mainly used to manufacture parts such as bolts, nuts, nails, rivets and steel balls. The forging blank material can be copper, aluminum, carbon steel, alloy steel, stainless steel, titanium alloy, etc., and the material utilization rate can reach 80-90%. Cold heading is mostly carried out on a dedicated cold heading machine, which is convenient to realize continuous, multi-station and automated production. Cutting, heading, accumulation, forming, chamfering, thread rolling, diameter reduction and trimming can be completed in sequence on the cold heading machine. The production efficiency is high, up to 300 pieces/min or more, and the diameter of the largest cold-headed workpiece is 48 mm. The schematic diagram of the cold heading bolt process is a typical process of cold heading bolts. The multi-station nut automatic cold heading machine is a multi-station nut automatic cold heading machine. The bar material is automatically fed to a certain length by the feeding mechanism, and the cutting mechanism cuts it into blanks, and then is sequentially sent to the accumulation and punching station by the clamp transfer mechanism for forming.

In the catering industry, Lengdun refers to the production of cold meat, that is, the work of making cold sauce and smoked sauce, also known as white case. Redun is the job of making frying and frying, also known as red case.

As far as the surface is concerned, cold-headed products look more beautiful than hot-headed products and have a better finish. In terms of use, hot-headed nuts are generally harder than cold-headed products and have higher strength. For users with high requirements, the material is There is a big difference.