Design of heavy-duty horizontal lathe tailstock moving device

Design of heavy-duty horizontal lathe tailstock moving device

With the rapid development of China's national economy and the need for national defense construction, there is an urgent need for the processing of (CNC) heavy-duty machine tools and super-tonnage parts. In the (CNC) heavy-duty CNC horizontal lathe, the tailstock mainly plays the role of tightening and supporting the workpiece, and according to the length of the workpiece processed by the machine tool, the mobile tailstock system realizes the ability to hold the workpiece. The traditional tailstock structure mode is that the worm gear is driven by a geared motor, and the tailstock is longitudinally fed on the bed body by meshing the gear shaft with the rack gear on the bed body, in order to prevent the tailstock from moving backward under the action of the turning force. A bolt test stop device is installed on the tailstock. However, the mechanism is widely used in ordinary and CNC horizontal lathes. For heavy-duty horizontal lathes, the weight of the workpiece is more than 100t, and the weight of the upper and lower body of the tailstock is also about 30t, which is driven by the worm gear and the rack and pinion. The transmission torque is insufficient, the gear is broken, and there is a creep phenomenon, which affects the movement of the tailstock on the bed. Therefore, a (CNC) heavy-duty horizontal lathe tailstock moving device was developed, which changed the rack and pinion transmission to the worm and worm gear transmission, mainly to overcome the insufficient transmission torque, jitter and creep in the tailstock movement. The mechanism has the characteristics of simple structure, convenient adjustment, light and flexible operation, stable and reliable tailstock movement, and the like, thereby ensuring the processing precision of the workpiece.

2. Introduction of (CNC) heavy-duty horizontal lathe tailstock mobile device

This (CNC) heavy-duty horizontal lathe tailstock moving device is mainly based on the production practice of our company (CNC) heavy-duty horizontal lathe for more than ten years, and the analysis of the movement mode of the tailstock of domestic and foreign (CNC) heavy-duty horizontal lathes. Provided is a device for driving a gear on a (CNC) heavy duty horizontal lathe through a geared motor to reduce the speed of the gear, and the worm and the worm wheel mesh to move the tailstock system longitudinally on the workpiece bed. The transmission torque and transmission rigidity of the heavy tailstock are improved, thereby improving the machining accuracy of the workpiece. The technical solution we adopted is to analyze the influence of the movement mode of the (CNC) heavy-duty horizontal lathe tailstock on the machining accuracy of the machine, mainly how to overcome the axial moment and creep phenomenon generated when the heavy-duty tailstock moves, without improving the motor. Under the premise of power, the movement of the tailstock can produce corresponding motion efficiency. This (CNC) heavy-duty horizontal lathe tailstock moving device mainly overcomes the phenomenon of small axial traction force, unstable motion and large reverse impact force. Compared with the rack and pinion transmission, it is easy to obtain reciprocating motion with low speed, good transmission rigidity, compact transmission structure, small inertia, simple structure, convenient adjustment, light and flexible operation, high motion sensitivity and good stability. Conducive to improve transmission accuracy and stability. The worm and worm drive is mainly used in the feed mechanism of the machine table such as the gantry milling machine and the horizontal boring machine. It is also a new attempt and technology extension for the movement of the (CNC) heavy duty horizontal lathe tailstock.

3.1 (CNC) structural principle of heavy-duty horizontal lathe tailstock moving device

3.2 (CNC) heavy-duty horizontal lathe tailstock mobile device

When the workpiece needs to be tightened, the I gear shaft 9 is driven by the reduction motor 13, and the gear 10 on the II shaft 17 is rotated by the I gear shaft 9 to rotate the gear 24 on the driven worm 26, and the gear 24 passes the double flat key and the worm. The connection 26 causes the worm 26 to rotate and engages with the volute 2 mounted on the bed 5 to urge the tailstock 1 to perform a longitudinal feed motion on the bed 5. After being moved to a certain position, the platen 3 is locked. The device changes the gear rack transmission to the worm and worm gear transmission, improves the axial traction force of the machine tool, reduces the axial swaying gap of the tailstock, reduces the crawling phenomenon when the tailstock moves, greatly improves the transmission rigidity, and the transmission component structure Compact, low inertia, and the worm worm has a retracting effect.

The mechanism has the advantages of simple structure, convenient adjustment, light and flexible operation, high motion sensitivity and good stability, which is beneficial to improving transmission accuracy and stability.

3.3 (CNC) advantages of heavy duty horizontal lathe tailstock mobile device

1) The influence of the movement mode of the tailstock on the machining accuracy of the machine tool is mainly how to overcome the axial moment and creep phenomenon generated when the heavy tailstock moves. Under the premise of not increasing the power of the motor, the tailstock can be moved accordingly. Exercise efficiency.

2) Adopting worm and worm gear transmission, the axial traction force of the machine tool is improved, the gap of the tailstock axial turbulence is reduced, the creeping phenomenon when the tailstock is moved is reduced, the transmission rigidity is greatly improved, the transmission component has compact structure and small inertia. And the worm snail has a anti-backup effect.

3) The mechanism is simple in structure, convenient to adjust, light and flexible to operate, high in motion sensitivity, and good in stability, which is beneficial to improve transmission accuracy and stability.

4, the conclusion

(CNC) heavy-duty horizontal lathe tailstock moving device, mainly overcomes the phenomenon of small axial traction, unstable motion and large reverse impact force. Compared with the rack and pinion transmission, it is easy to obtain reciprocating motion with low speed, good transmission rigidity, compact transmission structure, small inertia, simple structure, convenient adjustment, light and flexible operation, high motion sensitivity and good stability. Conducive to improve transmission accuracy and stability. The worm and worm drive is mainly used in the feed mechanism of the machine table such as the gantry milling machine and the horizontal boring machine. It is also a new attempt and technology extension for the movement of the (CNC) heavy duty horizontal lathe tailstock.