At room temperature, roughen the top of the bar or wire to form it. Cold heading is mainly used to manufacture bolts, nuts including Hexagonal Nut, iron nails, rivets and steel balls. Forging billet materials are copper, aluminum, carbon steel, alloy steel, stainless steel and titanium alloy, and the utilization rate of materials can reach 80% -90%. Cold heading is mostly performed on a dedicated cold heading machine, which is convenient for continuous, multi-station, automated production; on the cold heading machine, cutting, heading, accumulating, forming, chamfering, threading, shrinking, and trimming can be completed sequentially And other processes. The multi-station nut automatic cold heading machine is a multi-station nut automatic cold heading machine. The bar material is automatically fed into a certain length by the feeding mechanism, and the cutting mechanism cuts the blank of the layer, and then it is sequentially sent to the accumulation press and punching station by the clamp transmission mechanism.
Today Hex Nut Manufacturer will introduce the manufacturing process and processing of fasteners.
Cold heading refers to the pressing of raw materials at normal temperature, and hot heading refers to the pressing of raw materials after high temperature. There are no special requirements for specific applications. Generally, cold heading is required because of such surface finish and the composition of the material. Closer, and the larger parts are often cold-headed. Forging the head, also called hot compress, heats the head to burn red, and extrudes.
Most are pierced because it saves material. Depending on the tonnage of the pier forge and the bolt diameter, cold upsetting or hot upsetting can be used. Small batches of special or special bolts are milled after turning. A single batch of small batches can be used for die threading, lathe picking, and cyclone milling. In large-scale production, wire rolling and thread rolling methods are often used, which is very efficient. Because the bolt rod forming method has cold heading and reduced diameter, the diameter of the portion of this bolt without threads may not be slightly smaller; when the reduced diameter is used, it can be the same diameter or slightly larger than the thread.
The bolt material is an alloy or metal with a low melting point, such as aluminum alloy, titanium alloy, and copper alloy. Die casting can also be adopted. Steel is not manufactured by die casting.
The forming of the hexagonal head of the bolt: there are cold heading, hot heading, there are finished products directly after the pier, there are also after the pier, and there are all machined.
The bolt head is stamped with machining marks, and the mold marks of the mold are at the root.
Bolt threads with mechanical threading are similar to manual dies. For machine tools, large diameter bolts are required. There are also thread-screws, and the thread is extruded by a thread-screw plate using a thread-screw machine. The diameter of the unthreaded part of this bolt is slightly smaller.
The production of ordinary screws is divided into two steps. The first is the punch, which is to punch the head of the screw from the wire and cut the wire. The second is wire rubbing, which is based on the previous process, using two files to frustrate the threaded part.
As for the technical aspects, it is mainly that the selection of the die part of the punch must meet the use standard. There is also the thread pitch of the thread scraper. The outer diameter of the thread is adjusted by the distance between the two files. These basically include the requirements for the geometry of the screw.
As for some other processes. In terms of surface treatment, in addition to electroplating, oxidation, blackening, etc., the purpose is to prevent the product from rusting. Generally, the selection of this process is performed by salt spray test. Under the specified test environment and requirements, the solution that can pass the test and has the lowest cost is the best choice.
The above is the fastener processing process introduced by Expansion Bolt Supplier, and I hope to help you.