A fastener consisting of a head and a screw (a cylinder with external threads) in two parts, to be fitted with a nut, for fastening two parts with a through hole. This type of connection is called bolted connection. If the nut is unscrewed from the bolt, the two parts can be separated, so the tenon bolt connection is a detachable connection.
Countersunk screws play the role of connecting two or more objects and are an indispensable necessity in daily life or industrial manufacturing.
Cold forging forming Usually, the forming of the bolt head using cold heading plastic processing, compared with cutting processing, metal fiber (metal line) along the shape of the product is continuous, no cut in the middle, thus improving the strength of the product, especially excellent mechanical properties. Cold heading forming process includes cutting and forming countersunk head with tenon bolt processing technology, single click, double click cold heading and multi-station automatic cold heading.
An automatic cold header performs multi-station processes such as stamping, upsetting, extruding and reducing in several forming dies. The processing characteristics of the original blank used by the single-station or multi-station automatic cold heading machine are determined by the size of the rod material with a length of 5-6 meters or the size of the wire wire with a weight of 1900-2000KG, that is, the characteristics of the processing process is that the cold heading molding is not the use of a pre-cut single blank, but the automatic cold heading machine itself is cut and upset by the rod material and wire wire When needed) blank. Countersunk head with tenon bolt calculation method before extrusion cavity, blank must be shaped. The blank meeting the technical requirements can be obtained by shaping. The blank does not need shaping before upsetting, reducing and pressing. After the blank is cut, it is sent to the upsetting shaping station. The station can improve the quality of the blank, can reduce the forming force of the next station by 15-17%, and can extend the life of the mold, and the bolt can be made by multiple reducing.
