The CNC vertical lathe table needs to carry the workpiece and drive the workpiece to run together. Its bearing capacity and rotation accuracy undoubtedly affect the processing effect of the workpiece, and the support bearing under the table is the key to achieve all this. Crossed roller bearing is an innovative one-piece bearing solution for the optimized design of CNC vertical lathe table. Precision-equipped crossed roller bearings can provide a higher level of rotational accuracy and support rigidity, and save more design space and component materials.

The CNC vertical machine tool workbench generally adopts the method of connecting and fixing the side surface of the workbench base and the front end surface of the column. First, the rigidity of the connection between the worktable base and the column is not high; secondly, the center of the worktable does not coincide with the center of the column, and the machine tool is not a thermally symmetrical structure; The thermal deformation of the base is serious, and the accuracy and stability of the worktable are low when it works continuously for a long time, which seriously affects the accuracy of the machine tool. In addition, the main transmission of the worktable requires a separate main gearbox transmission, the transmission chain is long, the transmission structure is complex, and the transmission low efficiency.

The cylindrical hole of the inner ring of the crossed roller bearing is installed on the centering outer cylindrical surface of the upper part of the worktable base, and the lower end face of the inner ring is close to the shaft shoulder of the centering outer cylindrical surface of the upper part of the worktable base. The lower end face of the pressure ring is connected and matched with the upper end face of the centering outer cylindrical surface of the upper part of the table base, and the shoulder of the outer ring of the pressure ring presses the upper end face of the inner ring of the crossed roller bearing, so that the inner ring of the crossed roller bearing is axially positioned at the inner ring. on the base of the workbench. The upright column is installed on the connecting surface on the rear of the base of the workbench.

The worktable is installed on the upper part of the worktable base 7, the lower end face of the worktable is connected and matched with the upper end face of the ring gear seat, the outer cylindrical surface of the lower centering stop of the worktable is matched with the centering inner hole of the ring gear seat, and is The mating crossed roller bearings are concentric with the table base. The weight of the workpiece and the table 1 all act on the table base through the crossed roller bearing. The precision equipment crossed roller bearing bears the axial force and radial force generated by the load of the table, workpiece and cutting force at the same time.

The cylindrical hole of the ring gear seat is installed on the outer cylindrical surface of the outer ring of the crossed roller bearing. On the outer cylindrical surface, the upper end face of the ring gear is close to the lower end face of the outer shaft shoulder of the ring gear seat. The upper end face of the flange plate is installed on the lower end face of the ring gear seat, and the end face of the counterbore of the flange plate is pressed against the lower end face of the outer ring of the crossed roller bearing, and the ring gear seat and the ring gear are axially positioned on the table base.

The workbench adopts an integral thermally symmetrical structure. The bottom surface of the column sits on the upper connecting surface of the back of the workbench base. The connection rigidity between the column and the workbench base is high, the center of the column coincides with the center of the workbench base, and the workbench thermal stability accuracy is high . The main drive of the worktable adopts the structure in which the main motor is shifted by the second gear of the reducer, and the torque of the main motor is directly transmitted to the second axis of the worktable through the connecting belt. The main transmission chain of the worktable is short and the transmission efficiency is high.

The structure of this worktable has the characteristics of thermal symmetry, high dynamic and static stiffness, high precision, good precision retention, large load bearing, high rotation speed, small number and type of bearings, small number of parts, low cost, high reliability and good manufacturability.

The table structure of the new high-speed CNC vertical machine tool has been verified after being used on a 1.6m CNC CNC vertical machine tool. The axial force, radial force and overturning moment of the external load greatly improve the reliability of the machine tool and can greatly reduce the cost of the machine tool. CNC vertical machine tool table guide rail generally adopts rolling guide rail or static pressure guide rail structure. The rolling guide rail generally consists of 1 set of double row cylindrical roller bearings and 2 sets of thrust bearings. 2 types, a total of 3 sets of bearings are guaranteed. At present, the rolling guide rail structure of the worktable has many types and quantities of bearings, many parts, high cost and complex structure. Due to the excessive cumulative error of the parts, the problem of excessive precision of the worktable often occurs. The structure of the hydrostatic guide worktable is the same as that of the rolling guide worktable except that the hydrostatic oil chamber is used instead of the large thrust bearing to bear the workpiece load and cutting force. The structure of the hydrostatic guide rail table also requires a set of hydraulic devices. The manufacturing and daily maintenance costs of the hydrostatic guide rail table structure are high.