Gear shaft and spline shaft are common parts in mechanical equipment. In the mechanical equipment of metal processing, gear hobbing machine is usually used for the cutting of gear shaft, and gear hobbing is carried out with the chuck on the working table of gear hobbing machine and the top clamp of support frame (Fig. 1).
Due to the height of the support frame, the maximum length of the gear shaft to be machined is also limited. Therefore, the design and machining length of gear shaft of different types of gear hobbing machines are different.
In the continuous casting equipment of the steel plant, the end splines need to be machined for a long core shaft of about 2 m, while the hobbing machine limits the length of the gear shaft. The y3180h gear hobbing machine currently used by Jiangxi Xingang Machinery Manufacturing Co., Ltd. can process the length of the gear shaft about 0.9 M. in case that the length of the gear shaft or spline shaft exceeds the limited length of the gear hobbing machine, it can only be processed by the enterprises with large milling machines. By reforming the existing gear hobbing machine, the problem of machining the tooth profile of the super long mandrel is solved.
In order to overcome the above limitations of the existing gear hobbing machine, an auxiliary device for machining the long gear shaft of the gear hobbing machine is designed. The length of the gear shaft is extended by moving the support rod up and down, and the need for fixing different shaft diameters is realized by replacing the shaft sleeve.
In order to achieve the above purpose, the long gear shaft processing auxiliary device of the gear hobbing machine includes a supporting rod, the supporting rod is bent at 90 ° and forms a member of a long rod section and a short rod section, the end of the short rod section is fixed with a shaft seat, the shaft seat is installed with a shaft sleeve, the fixing seat is provided with a waist hole, the bolt is connected with one end of the long rod section through the waist hole of the fixing seat, and the end of the long rod section is fixed with a sliding plate, Both sides of the sliding plate are provided with V-shaped grooves matched with the fixed frame of the gear hobbing machine, and the outer side of the V-shaped grooves is provided with splints (Fig. 2).
The sliding plate and the support frame slide through the V-shaped groove, and clamp the splint. The long rod section is equipped with bolts connected with the waist shaped hole of the fixed seat, so that the long rod section can be adjusted up and down and locked and fixed on the original support frame of the gear hobbing machine. When using, first fix the shaft sleeve in the shaft seat of the end of the short rod section, connect the bolt with one end of the long rod section through the waist hole of the fixing seat, fix and connect the splint with the long rod section with the screw, match and connect the V-shaped groove on the outside of the sliding plate connected with the long rod section with the slide rail of the original support frame of the gear hobbing machine, and clamp the splint, Adjust the axis of the shaft sleeve to be perpendicular to the center line of the sliding rail on the surface of the gear hobbing machine and on the same plane, and fix the fixing base to the original support frame of the gear hobbing machine with bolts (Fig. 3).
When machining the workpiece, first clamp one end of the workpiece with a chuck, extend the other end of the workpiece into the hole of the shaft sleeve, adjust the support rod up and down to position the shaft sleeve at the proper position of the workpiece, lock the bolt of the long rod section to fix the support rod and the fixed seat, and then process the workpiece like the original gear hobbing machine (Fig. 4). The supporting rod is made of square or round steel members, and the workpieces with different shaft diameters can be processed by using shaft sleeves with different inner diameters. The workpiece can be a gear shaft or a spline shaft.