Analysis And Optimization Of Driving System For Cold-striking Machine

Toothed shaft parts,such as gear and spline,are important mechanical parts which are commonly used in transmission and bearing in industrial field.The traditional toothed shaft parts are mainly produced by cutting methods,which are inefficient,waste materials,poor surface quality and poor mechanical properties.Especially,they cannot meet the production requirements of high quality and high strength parts and equipment.The cold-striking is based on the symmetrical rolling wheel at room temperature,so that the workpiece can be struck quickly,causing the local deformation of the workpiece surface to form the tooth profile.The production efficiency is greatly improved,and the material is saved,the surface quality and the mechanical properties are greatly improved by using the principle of cold-striking forming.However,the existing cold-striking machine LQ200 also exists many problems,such as the accurate indexing problem of the workpiece shaft,the roll feed system too complex to respond quickly,vibration problems caused by the power transmission system of the cold-striking machine and so on.Therefore,optimizing the transmission system of the existing cold-striking machine plays an important role in improving the machining precision of the cold-striking machine.The spline shaft of the cold-striking machine is mounted on the feed box.The spline shaft acts as a bridge for power connection and is an important connecting shaft on the cold knocking machine..In this paper,the modal analysis of the spline shaft is performed by the workbench and it is found that the spline shaft has a large deformation during power transmission.In order to reduce the problems caused by the unsteady transmission of the spline shaft,a mechanical floating restraint device was applied to the spline shaft,so that it could be timely restrained.The stability of the spline shaft drive and work effectiveness of the cold-stricking machine were improved.In order to improve the precision of the rotation indexing of the workpiece shaft of the cold-stricking machine,dynamic analysis was performed on the linear grooved wheel indexing mechanism.It was found that there was severe shock vibration when the linear grooved wheel entered and exited the groove,which is caused by the linear grooved wheel's own structure.Based on the design principle of cam contour curve,a linear curve combination of wheel grooved curve was designed,which improved the vibration problem of the groove wheel mechanism when entering and exiting the groove.However,the problem of stability had not been solved fundamentally.The mechanical indexing mechanism was studied and it was found that the globoidal cam indexing mechanism can be used for smooth transmission at high speed.Finally,the mechanical indexing mechanism was analyzed,and it was found that the mechanical indexing mechanisms had certain deficiencies.A new type of closed-loop indexing system directly driven by the servo motor was designed to solve the problem of replacing indexing system for workpieces with different teeth numbers.It provided a theoretical basis for the structure design of cold-stricking machine.The roll feed system of the cold-stricking machine is composed of worm gear,gear set,screw,hydraulic cylinder and other components.The system is complex and the response is slow.The screw and gear connected parts are in a state of tension,exacerbating the wear of the screw.Aiming at the complicated structure,a new type of system for adjusting the distance between rollers is proposed.The design of the system is analyzed and the feasibility of the structure is analyzed to provide a theoretical basis for the optimization of cold-stricking machine.