KR101654746B1 - Control unit for preload of bearing which used in spindle of machining center - Google Patents

Control unit for preload of bearing which used in spindle of machining center Download PDF

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Publication number
KR101654746B1
KR101654746B1 KR1020150124095A KR20150124095A KR101654746B1 KR 101654746 B1 KR101654746 B1 KR 101654746B1 KR 1020150124095 A KR1020150124095 A KR 1020150124095A KR 20150124095 A KR20150124095 A KR 20150124095A KR 101654746 B1 KR101654746 B1 KR 101654746B1
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KR
South Korea
Prior art keywords
pressure
preload
control unit
bearing
command value
Prior art date
Application number
KR1020150124095A
Other languages
Korean (ko)
Inventor
김지수
Original Assignee
현대위아 주식회사
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Application filed by 현대위아 주식회사 filed Critical 현대위아 주식회사
Priority to KR1020150124095A priority Critical patent/KR101654746B1/en
Application granted granted Critical
Publication of KR101654746B1 publication Critical patent/KR101654746B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
    • B23Q5/02—Driving main working members
    • B23Q5/04—Driving main working members rotary shafts, e.g. working-spindles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
    • B23Q5/02—Driving main working members
    • B23Q5/04—Driving main working members rotary shafts, e.g. working-spindles
    • B23Q5/043—Accessories for spindle drives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
    • F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/52—Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions
    • F16C19/527—Bearings with rolling contact, for exclusively rotary movement with devices affected by abnormal or undesired conditions related to vibration and noise
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C25/00—Bearings for exclusively rotary movement adjustable for wear or play
    • F16C25/06—Ball or roller bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2322/00—Apparatus used in shaping articles

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Support Of The Bearing (AREA)
  • Turning (AREA)

Abstract

The present invention relates to a preload control unit, and more particularly, to a preload control unit which is capable of producing a preload at a desired low speed with less disturbance such as pulsation and noise, To a preload control unit.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a control unit for a spindle of a machine tool main shaft,

The present invention relates to a preload control unit, and more particularly, to a preload control unit which is capable of producing a preload at a desired low speed with less disturbance such as pulsation and noise, To a preload control unit.

Generally, the major axis of the machine tool comprises a housing and a shaft that rotates within the housing and provides power for machining.

In addition, the shaft is supported by a bearing inside the housing, which is located at a precise rotational position by a preload, and the load is supported and rotated.

These preloads have optimal values depending on the rotational speed of the pivots, and generally require a high preload at low speeds and a low preload at high speeds.

Generally, in order to adjust the preload to an optimum value during the spindle operation, a desired hydraulic pressure is generated by using a hydraulic pump and then supplied to the bearing. In this case, since a separate hydraulic pump is required, And there is a disadvantage that it becomes bulky.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a preload control unit capable of applying a preload to a bearing with a small volume without requiring a separate hydraulic pump and quickly and accurately supplying a target preload without pulsation and noise. .

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, the present invention provides a preload control unit for applying an optimal preload to a bearing supporting a shaft rotating in a housing according to a spindle rotational speed, A control valve; And an air / oil booster which is pressurized by the command value air pressure and outputs a command value oil pressure to apply a preload to the bearing.

In a preferred embodiment of the present invention, a hydraulic pressure sensor measures a current hydraulic pressure output from the air oil booster; And a closed loop controller for performing a closed loop control of the control valve so that the current hydraulic pressure becomes the set value hydraulic pressure.

In a preferred embodiment, the control valve comprises a proportional control valve.

In a preferred embodiment, a pneumatic sensor measures the output pneumatic pressure of the proportional control valve and inputs it to the closed loop controller.

In addition, the present invention is characterized in that the pre-pressure control unit; And a machine tool in which the bearing of the main shaft is pre-pressurized by the pre-pressure control unit, wherein the main shaft of the machine tool comprises: a housing; The shaft rotating in the housing; The bearing supporting the shaft in the housing; And a cylinder for applying pressure to the bearing, wherein the pre-pressure control unit outputs the command value hydraulic pressure to the cylinder.

The present invention has the following excellent effects.

According to the preload control unit of the present invention, since the bearing of the machine tool can be pre-pressurized using the pneumatic pressure existing in the factory without a separate pump, the volume is small, the manufacturing cost can be reduced, and pulsation and noise can be reduced .

Further, according to the pre-pressure control unit of the present invention, since the accurate command pressure can be output through the proportional control in accordance with the spindle speed during the spindle speed operation, it is possible to accurately apply the optimum pre-pressures according to the spindle speed.

FIG. 1 is a view for explaining a preload control unit according to an embodiment of the present invention and a machine tool system including the unit,
2 is a diagram showing a prototype of a preload control unit according to an embodiment of the present invention,
3 is a view for explaining a machine tool to which a preload is applied by the preload control unit according to an embodiment of the present invention.

Although the terms used in the present invention have been selected as general terms that are widely used at present, there are some terms selected arbitrarily by the applicant in a specific case. In this case, the meaning described or used in the detailed description part of the invention The meaning must be grasped.

Hereinafter, the technical structure of the present invention will be described in detail with reference to preferred embodiments shown in the accompanying drawings.

However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Like reference numerals designate like elements throughout the specification.

1 and 2, a preload control unit 110 according to an embodiment of the present invention applies a preload to a bearing of a machine tool spindle 120 so that the shaft of the spindle 120 is supported by the bearing So that it can be operated at an optimum preload amount in accordance with the number of spindle rotations.

In addition, the preload control unit 110 according to an embodiment of the present invention may be provided as one machine tool system 100 together with a machine tool having the main spindle 120.

The pre-pressure control unit 110 includes a control valve 111, an air oil booster 112, a hydraulic pressure sensor 113, a closed loop controller 114, and a pneumatic sensor 115.

The control valve 111 is a valve that outputs the input pneumatic pressure 10 at a desired set pressure pneumatically.

In addition, the control valve 111 is provided as a proportional control valve.

In addition, the input pneumatic pressure 10 input to the control valve 111 is an existing input pneumatic pressure at the factory, and the pre-pressure control unit 110 of the present invention does not include a separate pneumatic pump.

That is, since the pre-pressure control unit 110 of the present invention uses pneumatic pressure existing in the factory without a separate pneumatic pump, the volume of the apparatus can be reduced, and the manufacturing cost can be lowered.

The air oil booster 112 receives a command value air pressure output from the control valve 111 and outputs a predetermined command value oil pressure. The command value oil pressure is supplied to the main shaft 120, 120).

In addition, the air oil booster 112 does not have a separate pump therein, and is a device that receives the command value air pressure, presses the compressed fluid through the piston, and outputs the compressed air.

That is, the pre-pressure control unit 110 of the present invention is not provided with any pump device that operates as a motor for outputting the command value hydraulic pressure.

The oil pressure sensor 113 is a sensor for measuring a current oil pressure value output from the air oil booster 112.

Further, the current hydraulic pressure measurement of the hydraulic pressure sensor 113 is transmitted to the closed-loop controller 114 below.

In addition, the hydraulic pressure sensor 113 may be provided with a display for displaying the current hydraulic pressure measurement value.

The closed loop controller 114 receives the current hydraulic pressure measurement value and calculates a setpoint air pressure to be output from the control valve 111 so that the current hydraulic pressure measurement value becomes the set value hydraulic pressure, .

That is, the closed-loop controller 114 performs the closed-loop control of the control valve 111 so that the set-point oil pressure is output from the air-oil booster 112.

Accordingly, the reliability of the pressure value of the set command oil pressure can be improved, which is advantageous in suppressing the occurrence of vibration or noise when the shaft of the main shaft 120 rotates.

The pneumatic sensor 115 measures the output air pressure of the control valve 111 and displays the measurement to the operator or transmits the measurement to the closed loop controller 114.

Therefore, according to the pre-pressure control unit 110 of the present invention, since the bearing of the spindle 120 can be pre-pressurized using the pneumatic pressure existing in the factory without a separate pump, the volume is small and the manufacturing cost can be reduced , It is possible to output an accurate setpoint hydraulic pressure through the closed loop control and the proportional control, thereby improving the reliability of the preload.

3 shows a vertical section of the main shaft 120. Referring to FIG. 3, the pivot 120 includes a housing 121 and a housing 121, which rotates inside the housing 121, A bearing 123 provided between the shaft 122 and the housing 121 for supporting the shaft 122 at the housing 121 and a bearing 123 for supporting the bearing 122 (Not shown).

The bearing 123 is a bearing capable of supporting a portion of a thrust load generated in a direction parallel to the main axis, as compared with a general radial bearing. The bearing 123 is an angular contact ball bearing .

Further, when the preload is applied to the outer ring 123a, the bearing 123 supports the radial load and the thrust load and can operate.

The hydraulic pressure output from the pre-pressure control unit 110 is input to the hydraulic pressure input port of the housing 121, and the input hydraulic pressure presses the cylinder 124.

Then the cylinder 124 presses the outer ring 123a of the bearing 123 in a predetermined preload direction d so that the ball of the bearing 123 is positioned at a stepped position formed inside the outer ring 123a And simultaneously supports the radial load and the thrust load of the main shaft 122.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation in the present invention. Various changes and modifications will be possible.

100: machine tool system 110: preload control unit
111: Control valve 112: Air oil booster
113: Hydraulic pressure sensor 114: Closed loop controller
115: Pneumatic sensor 120:
121: housing 122: shaft
123: Bearing 123a: Outer ring
124: Cylinder

Claims (5)

A preload control unit for applying an optimal preload to a bearing supporting a shaft rotating in a housing in accordance with a spindle rotational speed,
A control valve for receiving an external input pneumatic pressure and converting the input pneumatic pressure into a desired setpoint air pressure and outputting the input pneumatic pressure;
An air / oil booster for pressurizing the fluid by the command value pneumatic pressure to output a command value hydraulic pressure and apply a preload to the bearing;
A hydraulic pressure sensor for measuring a current hydraulic pressure output from the air oil booster; And
And a closed loop controller for calculating the command value air pressure so that the current oil pressure becomes the command value oil pressure and performing a closed loop control of the control valve to output the command value air pressure,
The control valve is a proportional control valve,
And a pneumatic sensor for measuring the output pneumatic pressure of the proportional control valve and inputting it to the closed loop controller.
delete delete delete A preload control unit according to claim 1; And
And a machine tool in which the bearing of the main shaft is pre-pressurized by the pre-pressure control unit,
The main spindle of the machine tool:
housing;
The shaft rotating in the housing;
The bearing supporting the shaft in the housing; And
And a cylinder for applying pressure to the bearing,
And the pre-pressure control unit outputs the command value hydraulic pressure to the cylinder.
KR1020150124095A 2015-09-02 2015-09-02 Control unit for preload of bearing which used in spindle of machining center KR101654746B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150124095A KR101654746B1 (en) 2015-09-02 2015-09-02 Control unit for preload of bearing which used in spindle of machining center

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Application Number Priority Date Filing Date Title
KR1020150124095A KR101654746B1 (en) 2015-09-02 2015-09-02 Control unit for preload of bearing which used in spindle of machining center

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KR101654746B1 true KR101654746B1 (en) 2016-09-06

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112059213A (en) * 2020-08-31 2020-12-11 沈阳建筑大学 Method and system for intelligently adjusting bearing pre-tightening force of electric spindle

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1089355A (en) * 1996-09-12 1998-04-07 Daikin Ind Ltd Preload control device for main spindle bearing
KR101366140B1 (en) * 2013-06-10 2014-02-25 주식회사 에코텍 Bearing variable preload(adjustable preload) system utilizing deforming of sealing member and small gap of stroke
JP2015020254A (en) * 2013-07-22 2015-02-02 株式会社ケーヒン Spindle device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1089355A (en) * 1996-09-12 1998-04-07 Daikin Ind Ltd Preload control device for main spindle bearing
KR101366140B1 (en) * 2013-06-10 2014-02-25 주식회사 에코텍 Bearing variable preload(adjustable preload) system utilizing deforming of sealing member and small gap of stroke
JP2015020254A (en) * 2013-07-22 2015-02-02 株式会社ケーヒン Spindle device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112059213A (en) * 2020-08-31 2020-12-11 沈阳建筑大学 Method and system for intelligently adjusting bearing pre-tightening force of electric spindle
CN112059213B (en) * 2020-08-31 2022-01-11 沈阳建筑大学 Method and system for intelligently adjusting bearing pre-tightening force of main shaft

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