How to Process Bolt Head and Thread? The forming of bolt head adopts cold heading plastic processing. Compared with cutting, the metal fiber (metal wire) is continuous along the shape of the product, and there is no cutting in the middle. Therefore, the strength of the product is improved, especially the mechanical property is excellent. The forming process of cold heading includes cutting and forming, single station single click, double click and multi station automatic cold heading. Instead, it uses the automatic cold upsetting machine to cut and upset (if necessary) the blank from the bar stock and wire rod. Before extruding the cavity, the blank must be shaped. Through shaping, the blank can meet the technological requirements. The blank does not need to be shaped before upsetting, reducing and forward extrusion. After the blank is cut off, it is sent to the upsetting and shaping station. This station can improve the quality of the blank, reduce the forming force of the next station by 15-17%, and prolong the service life of the die.
Bolt thread processing: the thread is generally cold processed, so that the thread blank within a certain diameter range passes through the thread rolling plate (die), and the thread is formed by the pressure of the thread rolling plate (die). It is widely used to obtain products with high accuracy, uniform quality, high strength and no cut of the plastic flow line of the threaded part. In order to make the outer diameter of the thread of the final product, the required blank diameter of the thread is different, because it is limited by the thread precision, whether the material has coating or not. Rolling (rolling) and pressing thread is a kind of processing method which uses plastic deformation to form thread. It uses a rolling die with the same pitch and profile as the thread to be processed to extrude the cylindrical screw blank and make the screw blank rotate at the same time. Finally, the profile on the rolling die is transferred to the screw blank to form the thread. The common point of thread rolling (rolling) and pressing is that the number of rolling revolutions does not have to be too much. If it is too much, the efficiency is low, and the thread surface is easy to produce separation phenomenon or random thread phenomenon. On the contrary, if the number of turns is too small, the thread diameter is easy to be out of round, and the initial rolling pressure is abnormally increased, resulting in shortened die life. Common defects of rolling thread: surface crack or scratch of thread part; disorderly thread; out of roundness of thread part. If a large number of these defects occur, they will be found in the processing stage. If the number of defects is small and the production process does not pay attention to these defects, they will flow to users and cause trouble. Therefore, we should sum up the key problems of processing conditions and control these key factors in the production process.
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