Research Of SFL2506N Vertical Servo Turret

The numerically-controlled machine tool is praised as the "parent machine tool" of modern manufacturing industry, while the numerically-controlled lathe is the most widely used one, which can be divided into the following types according to the processing modes of workpiece:horizontal numerical-controlled lathe, vertical numerical-controlled lathe, turning and milling recombination centre, etc.As one of important categories, the vertical lathe is applicable to processing of the internal and external surface of single heavier rotating parts which are not suitable for hand haulage and have higher requirements for accuracy, such as disc type, circular arc and cone parts. The products meet the requirement of heavy load and heavy cutting force. The vertical lathe stands an area far less than the horizontal lathe for the workpieces with the same processing specification, leading to its wide application in the industries, such as automobile and motorcycle spares, molds, war industry machinery, etc.that require high efficiency, large quantity and high precision in processing for the rotating parts.Numerically controlled cutter holder is one of the core functional parts of the vertical numerical-controlled lathe, able to fix more than one cutters at the same time so as to enable the workpiece to complete more than one processes or even the whole processing coursein one clamping. It works to guarantee the cutter's position relative to the workpiece and the stability in processing, which will have a direct influence on the performance and machining efficiency of the vertical machine.The following requirements are also put forward according to the industry characteristics of vertical lathe:should have high precision, heavyload, high rotary speed and high stability, etc.However, the vertical cutter holders are still in the stage of middle and low-end products in China, being mainly electric cutter and hydraulic cutter, with great gap exiting from the foreign products in terms of technology, performance and stability. This has become one of the constraints for localization of vertical lathe and one of the factors hindering the improvement of the products'competitive power.The matching numerically controlled cutter holder of vertical numerical-controlled lathe in our company were all outsourced in the past, so the paper bases itself on the enterprise's actual demand and places focus on meeting the internal demand. A comprehensive refitting is carried out for the original electric products in terms of structural design, and we have been active in absorbing the technologies both at home and abroad, which are combined with the application characteristics and the productivity of the vertical lathe of the enterprise. Finally the product's basic structure is defined as follows:adopt the servomotor and controller with better performance in rotation rate, torque and stability for the driving source; pinpoint the mechanism, and change the original double-end fluted disc structure into tri-linked end fluted disc, thereby improving the velocity and precision of transposition; thelockingmechanism is changed into hydraulic locking from original mechanical locking, which strengthens locking force and stability.The paper focused on quantitative analysis of the power transferring and key positions of carrying stressof the cutter holder, with the cutter holder's behavior, structure and material characteristics, stressedstate, etc combined. In addition, it studied the checking and analysis method of vertical servo cutter holder, established strength check model on the reducing mechanism, locking mechanism and key structure of carrying stress, and simulated its stress carrying and the distortion based on the method of finite element analysis.A workbench for testing the dynamic, staticaccuracy, stressloading, and stability is designed in an effort to test the performance index and structural stability of the prototype. Test shows prototype SFL2506N has dividing precision of-5"?-6", resetting precision of-2"?+2", peak excursion of 0.003mm on the working position for the axial of instrument hole. And the performance indices such as static load, long-term operation stability, etc meet or exceed the design requirements, and are generally up to the foreign level of like products. This type of cutter holder has been applied to the VTC numerically controlled vertical lathe manufactured by The First Machine Tool Plant of Shenyang.