Spindle box for extra-heavy numerical control horizontal lathe

Abstract

The invention relates to the technical field of a heavy numerical control lathe, in particular to a spindle box of an extra-heavy numerical control horizontal lathe, which is provided with a main transmission shaft, a face plate, a spindle box body, a front static-pressure bearing, a rear static-pressure bearing and an axial bearing. The spindle box is characterized in that: a gear case is arranged at the rear end of the spindle box body; more than two suits of electronic pre-loading parallel servo motor drive systems are arranged inside the gear case; the electronic pre-loading parallel servo motor drive systems simultaneously drive the main transmission shaft to rotate by three-stage deceleration; an encoder is arranged at the rear end of the main transmission shaft so as to conveniently detect position data of the main transmission shaft; the front static-pressure bearing and the rear static-pressure bearing respectively are tapered bearings; a direction of a large opening is toward the face plate; a cone table matched with a conical bore inside the front static-pressure bearing is arranged at the rear end of the face plate; the taper of the main transmission shaft and corresponding surface of the rear static-pressure bearing is the same as that of the conical bore of the rear static-pressure bearing. The spindle box has the advantages of being novel in structure, high in radial rigidity, accurate in location, precise in scale division, high in work precision, stable in operation and the like, and can realize heavy load, large torque and high precision of a main transmission shaft box.

Description

technical field [0001] The invention relates to the technical field of heavy-duty numerical control machine tools, in particular to a super-heavy numerical control horizontal lathe spindle box. Background technique [0002] The main transmission shaft box of a traditional heavy-duty CNC horizontal lathe includes the main transmission shaft, face plate, headstock box, motor, front hydrostatic bearing, rear hydrostatic bearing and axial bearing. The main transmission shaft passes through the front hydrostatic bearing and rear hydrostatic bearing respectively The pressure bearing is fixedly connected with the headstock box, and the axial bearing is installed at the rear end of the main transmission shaft to bear the axial load of the main transmission shaft. The driving gear meshes with the transmission gear to drive the main transmission shaft to rotate to realize the rotation of the faceplate. Some of the front hydrostatic bearings and rear hydrostatic bearings use rolling be...

AI Technical Summary

Problems solved by technology

[0002] The main transmission shaft box of a traditional heavy-duty CNC horizontal lathe includes the main transmission shaft, face plate, headstock box, motor, front hydrostatic bearing, rear hydrostatic bearing and axial bearing. The main transmission shaft passes through the front hydrostatic bearing and rear hydrostatic bearing respectively The pressure bearing is fixedly connected with the headstock box, and the axial bearing is installed at the rear end of the main transmission shaft to bear the axial load of the main transmission shaft. The driving gear meshes with the transmission gear to drive the main transmission shaft to rotate to realize the rotation of the faceplate. Some of the front hydrostatic bearings and rear hydrostatic bearings use rolling bearings, and some use hydrostatic bearings, and the main transmission shaft is driven by a single motor. The disadvantages are : If rolling bearings are used, the main drive shaft supported by the rolling bearings will vibrate and make a lot of noise during the cutting process, which will cause vibration marks on the turned parts and affect the surface roughness of the workpiece. Due to the poor rigidity and low precision of the rolling support, it cannot meet the requirements. Existing ultra-heavy CNC horizontal lathes require heavy load and high precision. Similarly, the single-motor drive structure cannot meet the high torque requirements of the main drive shaft of ultra-heavy CNC horizontal lathes; if a hydrostatic bearing is used, the inner hole of the hydrostatic bearing will It is a cylindrical hole. When the oil flows out from the positive direction of the shaft, the oil will continue to increase, that is, there will be an acceleration, and the direction will point to the positive direction of the Z axis, so that the oil will flow out quickly in the positive direction of the Z axis, and the fluid will "calmly" pass through the inner cavity of the cylindrical hole Outflow, the overall pressure extreme changes, resulting in unstable work, resulting in inaccurate graduation of the faceplate

Poor working precision

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