KR20090030920A - Cooling apparatus for a main spindle of machine - Google Patents

Cooling apparatus for a main spindle of machine Download PDF

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Publication number
KR20090030920A
KR20090030920A KR1020070096611A KR20070096611A KR20090030920A KR 20090030920 A KR20090030920 A KR 20090030920A KR 1020070096611 A KR1020070096611 A KR 1020070096611A KR 20070096611 A KR20070096611 A KR 20070096611A KR 20090030920 A KR20090030920 A KR 20090030920A
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South Korea
Prior art keywords
oil
main shaft
cooling
spindle
machine tool
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KR1020070096611A
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Korean (ko)
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박윤종
염규용
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화천기공 주식회사
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Priority to KR1020070096611A priority Critical patent/KR20090030920A/en
Publication of KR20090030920A publication Critical patent/KR20090030920A/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
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/12—Arrangements for cooling or lubricating parts of the machine
    • B23Q11/126—Arrangements for cooling or lubricating parts of the machine for cooling only
    • 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
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/0003—Arrangements for preventing undesired thermal effects on tools or parts of the machine
    • 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
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/12—Arrangements for cooling or lubricating parts of the machine
    • B23Q11/126—Arrangements for cooling or lubricating parts of the machine for cooling only
    • B23Q11/127—Arrangements for cooling or lubricating parts of the machine for cooling only for cooling motors or 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
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/14—Methods or arrangements for maintaining a constant temperature in parts of machine tools
    • B23Q11/141—Methods or arrangements for maintaining a constant temperature in parts of machine tools using a closed fluid circuit for cooling or heating
    • 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
    • B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
    • B23Q17/10—Arrangements for observing, indicating or measuring on machine tools for indicating or measuring cutting speed or number of revolutions
    • 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
    • B23Q5/54—Arrangements or details not restricted to group B23Q5/02 or group B23Q5/22 respectively, e.g. control handles

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
  • Mounting Of Bearings Or Others (AREA)

Abstract

A principal axis chiller of machine tool is provided to improve the machining accuracy and to prevent the deformation of the principal axis according to the sudden change of the number of rotation of the principal axis and bearing. A principal axis chiller of machine tool comprises: a numerical value controller(50) of the principal axis chiller of the machine tool; a number of rotation change detection unit(51) detecting the moment when the number of rotation of the principal axis is changed from inputted processing data; and a performance increase and decrease part(52) increasing and decreasing the cooling performance an oil cooler(20) an oil cooler comprised of cooling device.

Description

공작기계의 주축 냉각장치{Cooling apparatus for a main spindle of machine}Cooling apparatus for a main spindle of machine

본 발명은 공작기계의 주축을 냉각시키는 공작기계의 주축 냉각장치에 관한 것으로, 보다 상세하게는 주축의 회전수가 급격하게 가감속되는 중에 냉각유의 온도의 감지가 지연되더라도 주축의 냉각이 원활하면서 안정적으로 이루어지도록 하고, 주축의 회전수의 급격한 변화에 따른 주축 및 베어링의 변형을 방지하여 가공의 정밀도가 향상되도록 하는 공작기계의 주축 냉각장치에 관한 것이다.The present invention relates to a spindle cooling device of a machine tool for cooling the spindle of a machine tool. More particularly, the cooling of the spindle is smooth and stable even if the detection of the temperature of the cooling oil is delayed while the rotation speed of the spindle is suddenly accelerated or decelerated. The present invention relates to a spindle cooling device for a machine tool to prevent the deformation of the spindle and the bearing caused by a sudden change in the rotational speed of the spindle so that the precision of machining is improved.

일반적으로 공작기계는 공구를 장착하여 회전시키기 위한 주축이 공작물 가공시 필요에 따라 고속으로 회전하게 된다. 이러한 고속회전으로 발생하는 높은 열로 인해 주축과 베어링이 팽창하게 된다.In general, a machine tool has a main shaft for mounting and rotating a tool to rotate at a high speed as necessary when processing a workpiece. The high heat generated by this high speed rotation causes the spindle and bearing to expand.

이와 같이 공작기계의 주축과 베어링이 팽창하게 될 경우 베어링에는 과도한 예압이 걸리게 되는데, 예압이 일정 수준을 넘어서게 되면 주축과 베어링이 손상을 입게 되어 공작기계의 가공정밀도가 떨어지게 되며, 그 뿐만 아니라 주축과 베어링의 수명은 물론 공작기계 자체의 수명까지도 단축될 수가 있다.As such, when the spindle and bearing of the machine tool expand, the bearing is subject to excessive preload. If the preload exceeds a certain level, the spindle and the bearing are damaged and the machining precision of the machine tool decreases. The life of the bearings as well as the life of the machine tool itself can be shortened.

이와 같은 문제점을 해소하고자 안출된 종래의 기술을 도 3에 도시하여 설명 하면 다음과 같다.Referring to FIG. 3, a conventional technology devised to solve such a problem is as follows.

종래의 공작기계 냉각장치는 베어링(B)에 의해 지지된 상태로 주축(S)을 둘러싸는 주축하우징(H)의 외부면과 주축몸체(C)의 내부면의 사이에 형성되는 오일챔버(100)와, 상기 오일챔버(100)에 연통되게 구비되는 유입관(201) 및 배출관(202)을 갖고 상기 배출관(202)의 관로상에 오일탱크(203)를 갖는 오일냉각기(200)와, 상기 유입관(201)의 관로상에 설치되는 순환펌프(300)와, 상기 배출관(202)에 설치되어 상기 오일챔버(100)를 통해 순환된 후에 상기 오일탱크(203)으로 유입되는 냉각유의 온도를 감지한 후에 감지된 온도정보를 상기 오일냉각기로 입력하는 온도센서(400)와, 입력된 가공데이터에 따라 상기 주축(S)을 회전시키는 주축모터(M)를 제어하는 수치제어부(500)를 포함한다.Conventional machine tool cooling device is an oil chamber 100 formed between the outer surface of the main shaft housing (H) surrounding the main shaft (S) in the state supported by the bearing (B) and the inner surface of the main shaft body (C) ), An oil cooler 200 having an oil tank 203 on the conduit of the discharge pipe 202 and having an inlet pipe 201 and a discharge pipe 202 provided in communication with the oil chamber 100, and the The temperature of the cooling oil flowing into the oil tank 203 after being circulated through the oil chamber 100 is installed in the circulation pump 300 and the discharge pipe 202 installed on the conduit of the inlet pipe 201 And a temperature controller 400 for inputting the sensed temperature information to the oil cooler after detection, and a numerical control unit 500 for controlling the spindle motor M for rotating the spindle S according to the input processing data. do.

상기 오일냉각기(200)는 온도센서(400)로부터 입력되는 온도정보에 따라 즉 냉각유의 온도에 따라 제어되는 것이다. 다시 말해서, 상기 오일냉각기는 온도센서로부터 입력되는 온도가 일정한 온도 이상이면 곧바로 가동되면서 냉각유의 온도를 일정한 온도 이하가 되도록 냉각시키는 역할을 한다.The oil cooler 200 is controlled according to the temperature information input from the temperature sensor 400, that is, the temperature of the cooling oil. In other words, when the temperature input from the temperature sensor is above a certain temperature, the oil cooler operates immediately to cool the temperature of the cooling oil to be below a certain temperature.

즉 냉각유의 온도가 일정한 온도 이상이 되면 오일냉각기(200)가 가동되면서 냉각유를 냉각시키게 되고, 이렇게 냉각된 냉각유는 순환펌프(300)에 의해 유입관(201)과 배출관(202)을 통해 오일챔버(100)의 내부에서 순환된다. 이와 같은 냉각유의 순환에 따라 상기 주축하우징(H)이 냉각되면서 상기 주축하우징(H)이 둘러싸고 있는 주축(S)과 베어링(B)을 냉각시키게 된다.That is, when the temperature of the cooling oil is above a certain temperature, the oil cooler 200 is operated to cool the cooling oil, and the cooled cooling oil is thus cooled through the inlet pipe 201 and the discharge pipe 202 by the circulation pump 300. It is circulated inside the oil chamber 100. As the cooling oil circulates, the main shaft housing H is cooled, thereby cooling the main shaft S and the bearing B that the main shaft housing H surrounds.

다시 말해서, 상기 온도센서(400)에 의해 입력된 정보에 따라 오일냉각 기(200)가 자체적으로 가동되면서 냉각된 냉각유가 순환펌프(300)에서 유입관(201)을 통해 오일챔버(100)로 유입된 후에 상기 오일챔버(100)에서 순환되고, 이 순환된 냉각유는 배출관(202)을 통해 상기 오일챔버(100)에서 배출되어 다시 오일탱크(203)로 유입된 후에 상기 오일냉각기(200)로 들어가 다시 냉각되고, 이와 같은 일련의 순환이 지속되면서 주축하우징(H)이 냉각된다.In other words, the cooling oil cooled by the oil cooler 200 itself operates in accordance with the information input by the temperature sensor 400 to the oil chamber 100 through the inlet pipe 201 from the circulation pump 300. After being introduced, the oil is circulated in the oil chamber 100, and the circulated cooling oil is discharged from the oil chamber 100 through the discharge pipe 202 and flows back into the oil tank 203 before the oil cooler 200. The main shaft housing (H) cools down as it is cooled again, and is cooled again.

상기 순환펌프(300)는 유입관(201)에서 오일챔버(100)로 상기 오일챔버(100)에서 배출관(202)으로 상기 배출관(202)에서 오일탱크(203)로 상기 오일탱크(203)에서 오일냉각기(200)로 상기 오일냉각기(200)에서 다시 상기 유입관(201)으로 냉각유를 강제로 순환시키는 역할을 한다. 상기 온도센서(400)는 배출관(202)의 끝단에 설치되는 것으로, 상기 배출관(202)에서 오일탱크(203)로 유입되는 냉각유의 온도를 감지하는 것이다.The circulation pump 300 from the oil tank 203 to the oil tank 203 from the discharge pipe 202 to the discharge pipe 202 from the oil chamber 100 to the oil chamber 100 in the inlet pipe 201 The oil cooler 200 serves to circulate the cooling oil forcibly from the oil cooler 200 to the inlet pipe 201. The temperature sensor 400 is installed at the end of the discharge pipe 202, to sense the temperature of the cooling oil flowing into the oil tank 203 from the discharge pipe 202.

그런데, 상기와 같은 종래 기술에는 다음과 같은 문제점이 있다.However, the above conventional technology has the following problems.

상기 온도센서가 주축에서부터 멀리 떨어진 곳에 위치되면서 상기 온도센서를 통한 냉각유의 온도의 감지하는 것, 즉 주축이 가열되어 냉각유가 데워진 후에 냉각유의 온도를 감지하는 것에는 상대적으로 긴 시간이 소요됨으로써, 주축의 회전수가 급격히 증가되어 주축이 급격히 가열되는 경우에 온도감지의 지연으로 인해 오일냉각기가 신속하게 냉각성능을 증대시키기 못하여 상기 주축의 냉각이 원활히 수행되지 못하는 문제점이 있다.As the temperature sensor is located far from the main shaft, the sensing of the temperature of the cooling oil through the temperature sensor, that is, the sensing of the temperature of the cooling oil after the main shaft is heated to heat up the cooling oil takes a relatively long time, When the number of revolutions is rapidly increased and the main shaft is rapidly heated, there is a problem that the cooling of the main shaft is not smoothly performed because the oil cooler does not rapidly increase the cooling performance due to the delay of temperature sensing.

다시 말해서, 상기 주축의 회전수가 급격히 증가하는 경우에는 상기 주축의 냉각이 원활하지 않아 주축 및 이를 지지하는 베어링의 변형되어 가공의 정밀도가 현저히 떨어지게 되는 문제점이 있다.In other words, when the rotational speed of the main shaft is sharply increased, there is a problem that the cooling of the main shaft is not smooth and the main shaft and the bearing supporting it are deformed and the precision of machining is significantly reduced.

또한, 주축의 회전이 급격히 감소하는 경우에도 오일냉각기가 신속하게 반응하지 못하여 상기 주축이 불필요하면서 과도하게 냉각되는 문제점이 있다.In addition, even when the rotation of the main shaft is sharply reduced, there is a problem that the oil cooler does not react quickly and the main shaft is unnecessary and excessively cooled.

이에 본 발명은 상기한 바와 같은 종래의 제반 문제점을 해소하기 위해서 안출된 것으로,Accordingly, the present invention has been made to solve the conventional problems as described above,

본 발명의 목적은 주축의 회전수가 급격하게 가감속되는 중에 냉각유의 온도의 감지가 지연되더라도 주축의 냉각이 원활하면서 안정적으로 이루어지도록 하고, 주축의 회전수의 급격한 변화에 따른 주축 및 베어링의 변형을 방지하여 가공의 정밀도가 향상되도록 하는 공작기계의 주축 냉각장치를 제공함에 있다.An object of the present invention is to smoothly and stably cool the spindle even if the detection of the temperature of the cooling oil is delayed during the rapid acceleration and deceleration of the spindle, and the deformation of the spindle and the bearing according to the sudden change in the revolution of the spindle An object of the present invention is to provide a spindle cooling device for a machine tool, which prevents the machining precision to be improved.

또한, 본 발명의 다른 목적은 냉각유의 온도변화를 보다 빠르게 감지할 수 있도록 하여 주축의 냉각이 보다 신속하게 이루어지도록 하는 공작기계의 주축 냉각장치를 제공함에 있다.In addition, another object of the present invention is to provide a spindle cooling device of the machine tool to be able to detect the temperature change of the cooling oil more quickly to make the cooling of the spindle more quickly.

상기와 같은 본 발명의 목적을 달성하기 위해서, 본 발명의 바람직한 실시예에 따른 공작기계의 주축 냉각장치는 주축하우징의 외부면과 주축몸체의 내부면의 사이에 형성되는 오일챔버와, 상기 오일챔버에 연통되게 구비되는 유입관 및 배출관을 갖고 상기 배출관의 관로상에 구비되는 오일탱크를 갖는 오일냉각기와, 상기 유입관의 관로상에 설치되는 순환펌프와, 상기 오일챔버를 통해 순환되는 냉각유의 온도를 감지하는 온도센서와, 주축을 회전시키는 주축모터를 제어하는 수치제어부를 포함하는 공작기계의 주축 냉각장치에 있어서; 상기 수치제어부는, 입력되는 가공데이터로부터 상기 주축의 회전수가 변동되는 순간을 검출하는 회전수 변동 검출 부와, 상기 회전수 변동 검출부에 의해 상기 주축의 회전수 변동이 검출되면 상기 주축의 회전수가 변동되는 순간에 상기 오일냉각기를 냉각성능을 증감시키는 냉각기 성능 증감부를, 포함하는 것을 특징으로 한다.In order to achieve the object of the present invention as described above, the spindle cooling device of the machine tool according to a preferred embodiment of the present invention is an oil chamber formed between the outer surface of the spindle housing and the inner surface of the spindle body, the oil chamber An oil cooler having an inlet pipe and an outlet pipe provided in communication with the oil tank provided on a pipeline of the discharge pipe, a circulation pump installed on the pipeline of the inlet pipe, and a temperature of the cooling oil circulated through the oil chamber In the spindle cooling device of the machine tool comprising a temperature sensor for detecting a; and a numerical control unit for controlling the spindle motor for rotating the spindle; The numerical value control section includes a rotational speed variation detecting section that detects a moment when the rotational speed of the main shaft changes from the input processing data, and the rotational speed of the main shaft changes when the rotational speed variation of the main shaft is detected by the rotational speed variation detecting section. It characterized in that it comprises a cooler performance increase and decrease section for increasing and decreasing the cooling performance of the oil cooler at the moment.

또한, 상기 온도센서는, 상기 오일챔버의 내부로 순환되는 냉각유의 온도를 감지하도록 상기 오일챔버의 내부에 구비되는 것을 특징으로 한다.The temperature sensor may be provided inside the oil chamber to sense a temperature of cooling oil circulated into the oil chamber.

본 발명은 주축의 회전수가 급격하게 가속 혹은 감속되는 중에도 주축의 냉각이 원활하면서 안정적으로 이루어지고, 주축의 회전수의 급격한 변화에 따른 주축 및 베어링의 변형을 방지하여 가공의 정밀도가 향상되는 효과를 갖는다.The present invention has the effect that the cooling of the spindle is made smooth and stable even while the rotational speed of the main shaft is rapidly accelerated or decelerated, and prevents deformation of the spindle and bearing due to the sudden change of the rotational speed of the spindle to improve the precision of machining. Have

또한, 본 발명은 냉각유의 온도변화를 보다 빠르게 감지할 수 있으므로 주축의 냉각이 보다 신속하게 이루어지는 효과를 갖는다.In addition, the present invention has the effect that the cooling of the main shaft is faster because it can detect the temperature change of the cooling oil more quickly.

이하, 첨부된 도면을 참조로 하여 본 발명의 바람직한 일실시예를 상세히 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명의 개략적인 요부 종단면도이고, 도 2는 본 발명의 요부 구성도이다.1 is a schematic longitudinal cross-sectional view of the main part of the present invention, Figure 2 is a main configuration of the present invention.

이에 도시된 바와 같이, 공작기계의 주축 냉각장치는 주축하우징(H)의 외부면과 주축몸체(C)의 내부면의 사이에 형성되는 오일챔버(10)와, 상기 오일챔버(10)에 연통되게 구비되는 유입관(21) 및 배출관(22)을 갖고 상기 배출관(22)의 관로상에 오일탱크(23)를 갖는 오일냉각기(20)와, 상기 유입관(21)의 관로상에 설치되는 순환펌프(30)와, 상기 오일챔버(10)를 통해 순환되는 냉각유의 온도를 감지한 후에 이 온도정보를 상기 오일냉각기(20)로 입력하는 온도센서(40)와, 주축(S)을 회전시키는 주축모터(M)를 제어하는 수치제어부(50)를 포함한다.As shown here, the spindle cooling device of the machine tool communicates with the oil chamber 10 formed between the outer surface of the spindle housing H and the inner surface of the spindle body C. An oil cooler 20 having an oil tank 23 on the conduit of the discharge pipe 22 and an inlet pipe 21 and the discharge pipe 22 provided to be provided on the pipe line of the inlet pipe 21. After rotating the circulation pump 30 and the temperature of the cooling oil circulated through the oil chamber 10, the temperature sensor 40 for inputting the temperature information to the oil cooler 20, and the main shaft (S) rotates Numerical control unit 50 for controlling the main shaft motor (M) to be.

상기 수치제어부(50)는 주축(S)의 회전수가 증가 또는 감소되는 순간 즉 회전수가 변동되는 순간을 검출하는 회전수 변동 검출부(51)와, 상기 주축(S)의 회전수 증가에 따라 오일냉각기(20)를 냉각성능을 증감시키는 냉각기 성능 증감부(52)를 포함한다.The numerical controller 50 includes a rotation speed variation detection unit 51 that detects a moment when the rotation speed of the main shaft S is increased or decreased, that is, a moment when the rotation speed is changed, and an oil cooler according to the increase in the rotation speed of the main shaft S. FIG. And a cooler performance increasing / reducing unit 52 for increasing or decreasing the cooling performance of the numeral 20.

상기 회전수 변동 검출부(51)는 수치제어부(50)로 입력되는 가공데이터로부터 주축(S)의 회전수가 변동되는 순간 즉 증가되는 순간 혹은 감소되는 순간을 검출하는 것으로, 상기 주축(S)의 회전수가 증가될 때 오일냉각기(20)를 냉각성능을 곧바로 증대시켜 상기 주축(S)의 냉각이 안정적으로 이루어지도록 회전수가 변화되는 순간을 검출하는 역할을 한다.The rotation speed variation detection unit 51 detects the moment when the rotation speed of the main shaft S is changed, that is, the moment of increase or decrease, from the processed data input to the numerical controller 50, and the rotation of the main shaft S is performed. When the number is increased, the oil cooler 20 immediately increases the cooling performance, and serves to detect the moment when the rotation speed is changed so that the cooling of the spindle (S) is made stable.

상기 냉각기 성능 증감부(52)는 회전수 변동 검출부(51)에 의해 주축(S)의 회전수가 변동되는 순간을 검출하게 되면 이 회전수가 변동되는 순간과 동시에 오일냉각기(20)를 직접 제어하여 회전수에 따라 적절히 냉각된 냉각유가 오일챔버(10)의 내부로 신속히 유입되어 냉각유에 의한 상기 주축(S)과 베어링(B)의 냉각이 신속하게 이루어지도록 하는 것이다.When the cooler performance increase / decrease unit 52 detects a moment when the rotation speed of the main shaft S is changed by the rotation speed fluctuation detecting unit 51, the cooler performance is directly controlled and rotates at the same time as the rotation speed is changed. Cooling oil appropriately cooled according to the number is quickly introduced into the oil chamber 10 so that the cooling of the spindle (S) and the bearing (B) by the cooling oil is performed quickly.

다시 말해서, 상기 냉각기 성능 증감부(52)는 주축(S)의 회전수가 증가되는 순간에는 오일냉각기(20)를 직접 제어하여 상기 오일냉각기(20)의 냉각성능을 상대적으로 증대시키고, 반대로 상기 주축(S)의 회전수가 감소되는 순간에는 상기 오일 냉각기의 냉각성능을 상대적으로 감소시켜 상기 주축(S)의 회전수에 맞추어 냉각유의 냉각이 적정하게 이루어지도록 하는 것이다.In other words, the cooler performance increase and decrease unit 52 directly controls the oil cooler 20 at the moment when the rotation speed of the main shaft S is increased, thereby relatively increasing the cooling performance of the oil cooler 20, and vice versa. At the moment when the rotation speed of S decreases, the cooling performance of the oil cooler is relatively decreased so that the cooling oil is appropriately cooled in accordance with the rotation speed of the main shaft S. FIG.

이와 같이 상기 냉각기 성능 증감부(52)를 통해 수치제어부(50)가 오일냉각기(20)를 직접 제어함으로써, 상기 주축(S)의 회전수가 급격하게 변화는 경우 예를 들어 상기 주축(S)의 회전수가 10rpm에서 2000rpm으로 급격히 변화는 경우에 상기 오일냉각기(20)의 냉각성능이 신속히 증대되어 상기 주축(S) 및 이를 지지하는 베어링(B)의 냉각이 안정적으로 이루어지게 된다.As such, when the numerical control unit 50 directly controls the oil cooler 20 through the cooler performance increase / decrease unit 52, the rotation speed of the main shaft S changes abruptly. When the rotational speed is rapidly changed from 10rpm to 2000rpm, the cooling performance of the oil cooler 20 is rapidly increased so that the cooling of the main shaft S and the bearing B supporting it is stable.

아울러, 상기 주축(S)의 회전수가 변동되지 않는 동안에는 온도센서(40)에 의해 감지되는 온도의 정보에 따라 오일냉각기(20)가 자체 가동되면서 냉각유의 온도를 일정한 온도 이하로 유지하여 상기 주축(S) 및 베어링(B)을 냉각시키게 된다.In addition, while the rotation speed of the main shaft (S) does not vary, the oil cooler 20 operates in accordance with the information of the temperature detected by the temperature sensor 40 while maintaining the temperature of the cooling oil below a predetermined temperature to maintain the main shaft ( S) and the bearing B are cooled.

이와 같은 역할을 하는 상기 온도센서(40)는 오일챔버(10)의 내부에 구비되는 것이 바람직한 데, 이는 상기 오일챔버(10)의 내부로 순환되는 냉각유의 온도를 상기 오일챔버(10)의 내부에서 직접 감지하여 냉각유의 온도변화를 보다 신속하게 감지할 수 있도록 하기 위한 것이다.It is preferable that the temperature sensor 40 having such a role is provided in the oil chamber 10, which is configured to convert the temperature of the cooling oil circulated into the oil chamber 10 into the oil chamber 10. This is to detect the temperature change of the coolant more quickly by directly detecting at.

이와 같이 구성되는 본 냉각장치는 가공데이터가 입력되어 공작기계가 작동되면 수치제어부(50)는 주축모터(M)를 제어하여 주축(S)을 회전시키면서 공작물을 가공하게 된다.When the cooling device is configured as described above, when the machining data is input and the machine tool is operated, the numerical control unit 50 controls the spindle motor M to process the workpiece while rotating the spindle S.

이때, 상기 수치제어부(50)의 회전수 변동 검출부(51)는 입력된 가공데이터로부터 주축(S)의 회전수가 변동되는 순간을 검출하게 되고, 상기 수치제어부(50)는 냉각기 성능 증감부(52)를 통해 상기 회전수 변동 검출부(51)에 의해 검출된 변 동 순간과 동시에 오일냉각기(20)의 냉각성능을 직접 증감시켜 주축(S)의 회전수에 반응하여 적정한 온도로 냉각된 냉각유가 순환되면서 주축(S) 및 베어링(B)을 안정적으로 냉각시키게 된다.At this time, the rotation speed variation detection unit 51 of the numerical control unit 50 detects the moment when the rotation speed of the main shaft (S) is changed from the input processing data, the numerical control unit 50 is the cooler performance increase and decrease unit 52 The cooling oil cooled to an appropriate temperature in response to the rotational speed of the main shaft (S) by directly increasing or decreasing the cooling performance of the oil cooler 20 at the same time as the change instant detected by the rotational speed variation detection unit 51 through the circulation While cooling the main shaft (S) and the bearing (B) stably.

이와 같이 상기 주축(S)의 회전수가 변동에 따른 오일냉각기(20)의 냉동성능에 대한 직접적인 제어를 통해 상기 주축(S)의 회전수가 급격하게 변화는 경우에도 적정한 온도로 냉각된 냉각유가 오일챔버(10)의 내부로 순환됨으로써, 상기 주축(S)의 회전수가 급격하게 증가되면서 발생되는 냉각불량에 따른 주축(S) 및 베어링(B)의 변형이 원활히 방지된다.As such, even when the rotational speed of the main shaft S changes abruptly through the direct control of the freezing performance of the oil cooler 20 according to the rotational speed of the main shaft S, the cooling oil cooled to an appropriate temperature is the oil chamber. By being circulated into the inside of the (10), the deformation of the main shaft (S) and the bearing (B) due to the cooling failure caused by the rapid increase in the rotational speed of the main shaft (S) is prevented smoothly.

도 1은 본 발명의 개략적인 요부 종단면도,Figure 1 is a schematic longitudinal cross-sectional view of the present invention,

도 2는 본 발명의 요부 구성도,2 is a main configuration diagram of the present invention;

도 3은 종래의 냉각장치를 보인 요부 종단면도.Figure 3 is a longitudinal sectional view of the main portion showing a conventional cooling device.

* 도면의 주요 부분에 대한 부호의 설명* Explanation of symbols for the main parts of the drawings

10 : 오일챔버10: oil chamber

20 : 오일냉각기20: oil cooler

21 : 유입관 22 : 배출관   21: inlet pipe 22: discharge pipe

23 : 오일탱크   23: oil tank

30 : 순환펌프 40 : 온도센서30: circulation pump 40: temperature sensor

50 : 수치제어부50: numerical control unit

51 : 회전수 변동 검출부 52 : 냉각기 성능 증감부   51: rotation speed fluctuation detection unit 52: cooler performance increase and decrease

S : 주축 H : 주축하우징S: Spindle H: Spindle Housing

C : 주축몸체 B: 베어링C: Spindle Body B: Bearing

M : 주축모터M: Spindle Motor

Claims (2)

주축하우징의 외부면과 주축몸체의 내부면의 사이에 형성되는 오일챔버(10)와, 상기 오일챔버(10)에 연통되게 구비되는 유입관(21) 및 배출관(22)을 갖고 상기 배출관의 관로상에 구비되는 오일탱크(23)를 갖는 오일냉각기(20)와, 상기 유입관(21)의 관로상에 설치되는 순환펌프(30)와, 상기 오일챔버(10)를 통해 순환되는 냉각유의 온도를 감지하는 온도센서(40)와, 주축을 회전시키는 주축모터를 제어하는 수치제어부(50)를 포함하는 공작기계의 주축 냉각장치에 있어서;An oil chamber 10 is formed between the outer surface of the main shaft housing and the inner surface of the main shaft body, and the inlet pipe 21 and the discharge pipe 22 provided in communication with the oil chamber 10, the pipeline of the discharge pipe An oil cooler 20 having an oil tank 23 provided thereon, a circulation pump 30 installed on a conduit of the inlet pipe 21, and a temperature of cooling oil circulated through the oil chamber 10. In the main shaft cooling apparatus of the machine tool comprising a temperature sensor 40 for detecting a; and a numerical control unit 50 for controlling the main shaft motor for rotating the main shaft; 상기 수치제어부(50)는,The numerical control unit 50, 입력되는 가공데이터로부터 상기 주축의 회전수가 변동되는 순간을 검출하는 회전수 변동 검출부(51)와,A rotational speed variation detection unit 51 for detecting the instant when the rotational speed of the main shaft is changed from input processing data; 상기 회전수 변동 검출부(51)에 의해 상기 주축의 회전수 변동이 검출되면 상기 주축의 회전수가 변동되는 순간에 상기 오일냉각기(20)를 냉각성능을 증감시키는 냉각기 성능 증감부(52)를,When the rotational speed variation of the spindle is detected by the rotational speed variation detection unit 51, the oil cooler 20 increases or decreases the cooling performance at the moment when the rotational speed of the main shaft changes. 포함하는 것을 특징으로 하는 공작기계의 주축 냉각장치.Spindle cooling device for a machine tool, characterized in that it comprises. 제1항에 있어서 상기 온도센서(40)는,The method of claim 1 wherein the temperature sensor 40, 상기 오일챔버(10)의 내부로 순환되는 냉각유의 온도를 감지하도록 상기 오일챔버(10)의 내부에 구비되는 것을 특징으로 하는 공작기계의 주축 냉각장치.Spindle cooling apparatus of the machine tool, characterized in that provided in the interior of the oil chamber 10 to sense the temperature of the cooling oil circulated into the oil chamber (10).
KR1020070096611A 2007-09-21 2007-09-21 Cooling apparatus for a main spindle of machine KR20090030920A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190045999A (en) 2017-10-25 2019-05-07 현대위아 주식회사 Cooling apparatus of main spindle for machine center
US20190255672A1 (en) * 2018-02-20 2019-08-22 Disco Corporation Water temperature setting method for processing apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190045999A (en) 2017-10-25 2019-05-07 현대위아 주식회사 Cooling apparatus of main spindle for machine center
US20190255672A1 (en) * 2018-02-20 2019-08-22 Disco Corporation Water temperature setting method for processing apparatus

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