The threads of the full threaded stud are generally c […]
The threads of the full threaded stud are generally cold worked so that a section of the diameter range of the thread blanks through the thread rolling (rolling) plate (die), from The threads, are formed by the pressure of the wire plate (roll die). It is widely used because the plastic flow of the threaded part are not cut off and the strength is increased, and the precision is high and the quality is uniform. In order to produce the outside diameter of the final product, the required diameter of the thread is different, because it depends on the accuracy of the thread, the material with or without coating, etc. factor limitations. Thread rolling refers to the process of forming threaded teeth by plastic deformation. It is the process of extruding a cylindrical billet while using a rolling (thread rolling) die with the same pitch and tooth shape as the thread to be processed. The threads are formed by turning the billet and finally transferring the thread shape of the rolling dies to the billet. The common point of thread rolling is that the number of rolls is not too many, if too many, the efficiency is low, and the surface of the threaded tooth is easy to produce the shape of the thread. The phenomenon of separation or random buckling.
On the contrary, if the number of revolutions is too small, the thread diameter is easy to lose roundness, the pressure at the beginning of rolling is abnormally high, which will shorten the life of the mold. The common defects of the rolling thread: thread part of the surface cracks or scratches; random buckle; thread part out of round. If these defects occur in large quantities, they will be found in the processing stage. If the number of defects is small, the defects will be circulated to the customer without being noticed in the production process, which will cause trouble. Therefore, it is necessary to summarize the key problems of processing conditions and to control these key factors in the production process.