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Device capable of eliminating gap of numerical control machine tool spindle

A technology for CNC machine tools and spindles, applied in the field of mechanical transmission, can solve the problems affecting the rigidity, load capacity and high speed of the spindle system of the machine tool, and achieve the effect of eliminating the spindle gap and solving the poor rigidity of the spindle.

Inactive Publication Date: 2012-05-30
DALIAN CHUANGDA TECH TRADE MARKET
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the high-speed rotation of the spindle, due to the wear of the support, the spacer and the bush, and the high temperature rise of the support, the spindle will produce axial elongation and deformation, resulting in spindle clearance, which will affect the stiffness, load capacity and High speed and large vibration and noise, so it is necessary to study a reasonable structural device to eliminate the clearance of the main shaft to be applied to the main shaft system of small and medium-sized high-speed machinery

Method used

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  • Device capable of eliminating gap of numerical control machine tool spindle
  • Device capable of eliminating gap of numerical control machine tool spindle
  • Device capable of eliminating gap of numerical control machine tool spindle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment l

[0014] Preferred embodiment 1: as figure 2 As shown, the present invention includes a front support 4 and a rear support 14 placed in the holes at both ends of the axle sleeve 6, the main shaft 7 is installed in the front support 4 and the rear support 14, and the first spacer 9 and the first spacer 9 are arranged in the axle sleeve 6. Two spacers 12, wherein the front end of the first spacer 9 leans against the front support 4, the rear end of the second spacer 11 leans against the rear support 14, and the outer diameter of the spacer is fixed in the axle sleeve 6, along the distance There are 6 positioning holes evenly distributed in the circumferential direction of the sleeve, and 6 small compression springs are fixed in the holes. When the spindle runs at high speed, the temperature of the support heats up the spindle, which causes elongation and deformation in the axial direction, and the compression spring generates radial thrust. The preload of the support system i...

Embodiment 2

[0015] Preferred embodiment 2: as image 3 As shown, similar to the preferred embodiment 1, the designed pretensioning device is an integral compression spring 16, one end of the integral compression spring 16 leans against the first spacer 9, and the other end leans against the rear support 14, through the deformation of the compression spring Automatically compensates for backlash caused by spindle deformation.

Embodiment 3

[0016] Preferred embodiment 3: as Figure 4 As shown, a first spacer 9 is provided in the shaft sleeve 6 and at one end of the front support 4, and the outer diameter of the spacer is stuck in the shaft sleeve 6 to be fixed. The pre-tightening structure is a step surface provided in the shaft sleeve 6, one end of the step surface is inwardly recessed and is in contact with and closely matched with one end of the first spacer 9, and the other end of the step surface is inwardly recessed and is closely matched with the rear support 14, for To ensure the disassembly process, the inward recess of the step should not exceed the inner diameter of the outer ring of the rear bearing. When the gap is generated, the inner ring of the rear bearing moves forward by tightening the nut 3 of the rear end cover, and at the same time, the inner ring of the front bearing moves backward through the transmission of force to achieve the purpose of eliminating the gap of the main shaft.

[001...

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PUM

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Abstract

The invention discloses a device capable of eliminating a gap of a numerical control machine tool spindle, and the device comprises a front support and a rear support, wherein the front support and the rear support are arranged on the front end and the rear end of a shaft sleeve; a spindle is axially arranged in the front support and the rear support; a front end cover and a rear end cover are respectively detachably fixed on the front end of the front support and the rear end of the rear support; a contact surface between the front support and the front end cover is provided with a labyrinth seal; the shaft sleeve is fixed on the tank body of the numerical control machine tool by a bolt; and the a shaft-end nut on the rear end of the rear support causes the spindle, the front support and the rear support to be positioned in the shaft sleeve. The device capable of eliminating the gap of the numerical control machine tool spindle is characterized in that a pre-tightening structure used for eliminating the gap of the spindle is arranged in the shaft sleeve and is distributed on the periphery of the spindle; a spacer bush is arranged between one end and the front support; a spacer bush is arranged between the other end and the rear support; the front support and the rear support both adopt a bearing pack; grinding particles are embedded into the outer surface of an outer ring of the bearing; and in the pre-tightening structure, modes of circumferential evenly-distributed small pressure springs, an integral pressure spring and the inner step surface of the shaft sleeve are respectively adopted in a preferable embodiment. In the mode of regulating pre-tightening, the gap of the spindle, which is generated because of thermal elongation and deformation in a workpiece milling process, can be eliminated so as to solve the problems of poor spindle rigidity, big vibration and large noise in the practical operation process of the numerical control machine tool.

Description

technical field [0001] The invention relates to the field of mechanical transmission, in particular to a device for eliminating the gap between the spindles of a numerically controlled machine tool. Background technique [0002] Spindle is a key functional component in precision machining CNC machine tools. The design, manufacture and performance of the spindle directly affect the overall development level of the processing machine tool. The key to the precision machining of the spindle is that the spindle can not only achieve high-speed and low-speed rotation during operation, but also have high operation accuracy and low vibration. At the same time, the spindle should have sufficient rigidity to withstand radial and axial cutting loads. During the operation of the spindle, especially when the spindle drives the milling cutter to rotate the milling workpiece, the pre-tightening force is likely to be insufficient and the rigidity is reduced. series of questions. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23Q5/56B23B19/02
Inventor 孙文秀
Owner DALIAN CHUANGDA TECH TRADE MARKET