Threaded bolt thread commonly used in cold working
Threaded bolt thread commonly used in cold processing, so that a certain diameter range of the thread blank through the rub (roll) wire (die), from the wire (roller) pressure to thread forming. It is widely used to obtain that the plastic flow line of the thread portion is not cut off, the strength is increased, the precision is high, and uniform quality. In order to make the thread diameter of the final product, the required thread blank diameter is different because of the accuracy of the thread, the material with or without coating and other factors. Rolling (rubbing) pressure thread is the use of plastic deformation of the thread forming process. It uses a roll (roll plate) mold with the same pitch and profile as the thread to be machined, while pressing the cylindrical billet while rotating the billet, eventually transferring the profile on the roll mold to Spiral blank, the thread forming. Rolling (rubbing) pressure thread processing commonality is that the rolling speed does not have too much, if too much, then the efficiency is low, the thread surface is prone to separation or chaos phenomenon. On the contrary, if the number of revolutions is too small, the diameter of the thread tends to be out of order, and the pressure in the initial stage of rolling is abnormally increased, resulting in a shortened mold life. Rolling thread common defects: thread surface cracks or scratches; chaos buckle; thread part of the circle. If these defects occur in large quantities, they will be found in the processing stage. If less occurs, the manufacturing process will not be able to notice these defects will flow to the user, causing trouble. Therefore, the key issues of processing conditions should be summarized in the production process to control these key factors.
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