Rolling molding process is mainly based on the plastic movement of the material rolling processing into various shapes of complex shaft, valve core and special fasteners and other products. Rolling deformation is line contact, continuous step by step, the required deformation force is small, one stroke can produce one or several workpieces. Rolling molding process and cutting, grinding process compared, it is not only high production efficiency, material saving, and high product strength, stable quality, this process is especially suitable for processing long short difficult to cut the workpiece, especially for the annual output of millions of pieces of mass products, using rolling molding process is the most favorable, the economic benefits are the most considerable.
Rolling forming has been around since the 1960s in Europe. Due to the advantages of high production efficiency, material saving and increased product strength, rolling molding is not only used in threaded fastener industry, automobile, bicycle and other industrial sectors also use rolling molding process to process parts with complex shapes. With the development of technology and production, more and more people pay attention to the rolling molding process.
1, the characteristics of rolling molding
Rolling molding process and cutting, grinding process compared, it is not only high production efficiency, material saving, and high product strength, stable quality, this process is especially suitable for processing long short difficult to cut the workpiece, especially for the annual output of millions of pieces of mass products, using rolling molding process is the most favorable, the economic benefits are the most considerable.
2, rolling molding materials and equipment
Rolling process is a kind of cold forging process, which can be rolled into a lot of materials, including low carbon steel is commonly used in rolling forming materials, non-ferrous metal is more suitable for rolling forming.
Roll forming parts are generally made by upsetting the blank parts with cold heading machine and then rolling through the thread rolling machine. The equipment for thread rolling and rolling molding is: various reciprocating plate rolling machine, planetary rolling machine, two cylinder rolling machine and three cylinder rolling machine, etc. And the most common rolling molding is the reciprocating plate rolling machine. Therefore, for manufacturers with cold heading machines and thread rollers, it is only a matter of designing the rolling mould.
3. Rolling molding process and mold
A movable wire plate rolled with a fixed wire plate for relative reciprocating motion. Rolling molding is to roll the different structural designs on the wire plate onto the workpiece. According to the need can be rolled out a variety of thread, convex ring, knurl, end chamfer and depth and width of different grooves and other required shapes.
Rolling molding is more complex and more demanding than rolling thread. The mold design is based on the different shape of the workpiece, the design of the rub wire plate into a section or several sections, can be used synchronous; It can also be graded. When the diameter of the blank along the axis is the same or basically the same, synchronous rolling molding can be adopted. When the diameter of the blank parts along the axis is not the same, the diameter of several different structures need to be rolled, then the graded rolling molding is used. Generally can be a rolling molding, the shape of complex can also be two rolling molding
Pressing molding is an advanced processing technology, and its remarkable process characteristics are paid attention to by the automobile industry at home and abroad. The United States, Japan, the United Kingdom, Germany, France and Russia and other countries are vigorously developing this process, the United States with rolling molding process of automobile shaft, up to 200 pieces per minute, than the original cutting more than 40 pieces.
