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Principal axis device

A main shaft device and main shaft technology, applied in the directions of shafts, bearings, liquid cushion bearings, etc., can solve the problems of unstable main shaft and reduced bearing rigidity, and achieve the effect of improving operating capacity, increasing natural frequency, and simplifying air bearing structure.

Inactive Publication Date: 2004-03-31
HITACHI SEIKO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] However, if the outer diameter of the main shaft is reduced, the bearing rigidity (bearing strength) when the main shaft is supported by an air bearing decreases, so there is a risk of instability when the main shaft is rotated at high speed.
In addition, in order to shorten the overall length of the main shaft, it is necessary to shorten the distance between the rows of air supply holes 13 constituting the air bearings A and B, or to arrange only one of the air bearings A and B, but in either case, the The rigidity of the above-mentioned bearings is lowered by the air bearing, so there is a danger of instability when the spindle is rotated at high speed.

Method used

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no. 1 Embodiment approach

[0033] figure 1 is a cross-sectional view of the spindle device according to the first embodiment of the present invention, having the same Figure 5 Elements of the same configuration, elements (components) having the same function, and elements (components) having the same function although slightly different in shape are given the same reference numerals and their descriptions are omitted.

[0034] The spindle device in this embodiment has one end ( figure 1 The main shaft 1 having a slotted collet (tool holding mechanism) 2 and a gas bearing mechanism capable of supporting the main shaft 1 rotatably on a housing (casing member) 10 are provided.

[0035] Housing 10 has along the axial direction ( figure 1 up and down direction) hole 11. The hole 11 includes two chambers 11a for accommodating the two pistons 22, a coil accommodating portion 11b for accommodating the coil 12, a shaft accommodating portion 11c for accommodating the front end portion of the main shaft 1 rota...

no. 2 Embodiment approach

[0049] Next, press figure 2 A second embodiment according to the present invention will be described. The figure is a sectional view of the spindle device according to the present embodiment. Due to this implementation, with figure 1 Compared with the previous embodiment shown in , only the central guide rod 30 is integrally formed with the push rod 20, and the other parts are substantially the same, so the figure 1 , Figure 5 Elements of the same configuration, elements (components) having the same function, and elements (components) having the same function although slightly different in shape are given the same reference numerals and their descriptions are omitted.

[0050] That is, a small diameter portion 10d is provided between the cavity 11a at the inner side of the housing 10 and the coil accommodating portion 11b, and is fixed in a state of engaging with the cylindrical guide member 40, and the small diameter portion 10d The stepped portion 10c formed on the lo...

no. 3 Embodiment approach

[0056] image 3 is a cross-sectional view of a spindle device according to a third embodiment of the present invention, having the same figure 1 ,Figure 5 Elements of the same configuration, elements (components) having the same function, and elements (components) having the same function although slightly different in shape are given the same reference numerals and their descriptions are omitted.

[0057] The main shaft device in this embodiment, and figure 1 The spindle unit shown in is different in that the air bearing A is not provided, and on the opposite side of the slotted collet (tool holder) 2 at the front end of the spindle 1 ( image 3 The point of disposing the flange 1f, and the point of making the piston 22A that constitutes the piston 22 by one (one series). With this, figure 1 An air supply hole (gas ejection hole) 15 provided centrally below is provided at a central portion of the housing 10 at a portion facing the flange 1f.

[0058] Where the bearing ...

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PUM

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Abstract

A bottomed hole opened to an end part on the opposite side to the holding side of a drill is formed around a rotation axis of the spindle. A center guide provided with a plurality of air supply holes of a journal gas bearing at the outer periphery is fitted to the bottomed hole and supported to a housing. Compressed air is blasted from the air supply holes to support the spindle radially from the center side. Since the spindle of such constitution can reduce mass, natural frequency is heightened to obtain structure causing no unstable phenomenon even if rotated at high speed.

Description

technical field [0001] The present invention relates to a spindle device including a spindle having a mechanism for holding a tool at one end, and an air bearing mechanism that rotatably supports the spindle. Background technique [0002] Figure 5 It is a cross-sectional view showing a spindle device in a conventional printed circuit board drilling machine. In this figure, a female tapered surface 1t is formed on the front end portion (lower end portion in the figure) of the main shaft 1 accommodated in the housing 10 . That is, the main shaft 1 has a blind hole 7 formed in the axial direction, and a through hole penetrating the axial direction is formed in the central portion of the bottom surface of the blind hole 7 . And the inner surface of this through-hole becomes the said tapered surface 1t whose diameter expands at the front-end|tip side (lower side in a drawing). In addition, on the outer periphery of the split jacket 2, a male tapered surface 2t having the same ...

Claims

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Application Information

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IPC IPC(8): B23Q1/38B23Q1/70F16C32/06
CPCB23Q1/70F16C32/0696B23Q1/38F16C32/064F16C2322/39
Inventor 田中慎治
Owner HITACHI SEIKO LTD
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