Rolling is a process that uses rolling tools with a certain cross-sectional area to roll the billets of certain materials in the Jin Dynasty, causing geographical deformation and forming pits with corresponding cross-sectional shapes.

From this, it can be seen that hydraulic screws are a chip free method. The essence of a fully automatic screw twisting machine is to use some plastic materials to be added in a cold state, so that the billet undergoes plastic deformation under the rolling tool, and the corresponding threads are rolled out. In the process of hydraulic thread machining, the actual thread is the result of the redistribution of the raw metal extruded by the working thread of the rolling tool.

The process of rolling threads under cold conditions began in 1831, when bolts used to fasten railway sleepers were rubbed by wire controlled machines. However, until 1940 printing, the precision threads of the rolling mill had not been widely used. This is mainly due to the unsuitability of raw materials for rolling in the late 19th and early 20th centuries. With the further improvement of the mechanical properties of billets, as well as the successful development of high-precision hydraulic tools and high-tech rolling machines, the rolling technology of threads on spiral rolling machines has been popularized, and the wind force is also increasing. Can be used for sodium carbonate and alloy steel (such as taps, engine anchor bolts and power plugs, spindle and lead screw threads, threads on hollow thin-walled parts, etc.).

On various billets such as bronze, brass, aluminum, plastic, drilling, nickel, powder metallurgy, plastic, etc., various threads (including precision threads) are rolled onto various types of parts (such as taps, engine anchor bolts and power boring bolts, spindles and threads). Read, hollow thin-walled parts, etc.