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Numerical control ultra-precision spindle system of head stock

A spindle and bearing technology, applied in the field of CNC ultra-precision lathe headstock spindle system, can solve the problems of high compressibility, low air density, corrosion of metal bearings, etc.

Inactive Publication Date: 2010-09-08
黎永明 +2
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  • Application Information

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Problems solved by technology

[0002] From the available information, it can be seen that the precision lathe shaft of the Technical University of Munich (R.Unterberger: "Vereinfachte berechnung dertragfunegkeit von aerostatischen Luft-Lagern unt fuhrungen", F&M 87Jahrung Heft 8.), Japan's ultra-precision lathe ("Bnlletin of the Japan Society of precision enginecring"Vol, 13, No.2, June 1979) and so on respectively adopt the shaft system of aerostatic hemispherical and spherical bearings. The compressibility is very large, so the rigidity of the spindle is very small, and it is only suitable for high-speed and light-load machine tools. The moisture in the air will also cause corrosion of metal bearings. If it is made of difficult-to-machine corrosion-resistant materials or a drying device is added, it will greatly increase. cost

Method used

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  • Numerical control ultra-precision spindle system of head stock
  • Numerical control ultra-precision spindle system of head stock
  • Numerical control ultra-precision spindle system of head stock

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[0008] The small gap between the two concave hemispheres fixed on the box 7 and the convex hemisphere fixed on the main shaft is filled with 1-5MPa pressure oil, and the roundness of the hemisphere is as high as 0.05-0.10μm; the liquid dynamic and static pressure cylinders of the unloading device - Thrust bearing, in addition to reducing the impact of the vibration caused by the weight of the pulley and the pulling force on the main shaft, the oil pressure of the oil cylinder can also move the piston to tighten the spring chuck at the main shaft end; the elastic coupling is a flexible plastic with liquid Tube, which connects the unloading shaft with the main shaft, once again reduces the tiny vibration when the unloading shaft rotates to zero limit, so that the radial and axial runout accuracy of the main shaft can reach a range of less than 0.1 μm. The specific implementation is as follows

[0009] from figure 1 It can be seen that the two ends of the main shaft 10 are suppo...

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Abstract

The invention relates to an ultra-precision spindle system which adopts a liquid dynamic and static press technology, the system comprises a liquid dynamic and static press semispherical bearing, a liquid dynamic and static press column-anti-thrust unloading bearing, an automatic workpiece clamping device and a flexible articulator between the spindle and an unloading device, and the system is characterized in that: a half convex ball which is fixed with the spindle rotates in oil liquid with pressure relatively to a half concave ball which is fixed in a box hole of the headstock of a lathe; a belt wheel is driven by a stepless speed regulating motor, and the weight and the radial tensile force of the belt wheel are borne by the liquid dynamic and static press column-anti-thrust unloading bearing; and the workpiece is clamped by a cylinder pull-rod spring chuck or a hydraulic (pneumatic) three-jaw chuck in the liquid dynamic and static press column unloading bearing, and the workpiece is driven to rotate by the flexible articulator. The spindle system consisting of the special structures has very small spindle rotation error and high shafting rigidity.

Description

technical field [0001] The patent of the present invention relates to a CNC ultra-precision lathe headstock spindle system, especially the spindle is supported by hydrodynamic and static pressure hemispherical bearings, the weight of the pulley and the belt tension are removed by the hydrodynamic and static pressure cylinder-thrust bearings, both The rotating parts are connected by flexible couplings to form a special spindle system. Background technique [0002] From the available information, it can be seen that the precision lathe shaft of the Technical University of Munich (R.Unterberger: "Vereinfachte berechnung dertragfunegkeit von aerostatischen Luft-Lagern unt fuhrungen", F&M 87Jahrung Heft 8.), Japan's ultra-precision lathe ("Bnlletin of the Japan Society of precision enginecring"Vol, 13, No.2, June 1979) and so on respectively adopt the shaft system of aerostatic hemispherical and spherical bearings. The compressibility is very large, so the rigidity of the spindl...

Claims

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Application Information

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IPC IPC(8): B23B19/00B23B19/02
Inventor 黎永明黎纯赵黎萍
Owner 黎永明
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