KR19980061543A - Cutting processing system using in-process measurement and its processing method - Google Patents
Cutting processing system using in-process measurement and its processing method Download PDFInfo
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- KR19980061543A KR19980061543A KR1019960080914A KR19960080914A KR19980061543A KR 19980061543 A KR19980061543 A KR 19980061543A KR 1019960080914 A KR1019960080914 A KR 1019960080914A KR 19960080914 A KR19960080914 A KR 19960080914A KR 19980061543 A KR19980061543 A KR 19980061543A
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- tool
- sensor
- motion error
- cutting
- measurement
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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
- B23Q5/20—Adjusting or stopping working-spindles in a predetermined position
-
- 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
- B23Q2705/00—Driving working spindles or feeding members carrying tools or work
- B23Q2705/02—Driving working spindles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Machine Tool Sensing Apparatuses (AREA)
- Automatic Control Of Machine Tools (AREA)
Abstract
본 발명에 따른, 인프로세스 측정을 이용한 절삭가공 시스템은 주축의 운동오차를 측정하는 인프로세스 측정장치와 공구를 미소량 움직이는 공구 이송장치로 구성되어 있다. 인프로세스 측정장치는 센서, 측정기준면, 그리고 측정에 의해 얻어진 센서출력을 이용하여 공구의 미소이송량을 결정하는 연산부로 이루어져 있으며, 공구 이송장치는 공구를 움직이기 위한 구동기, 공구 이송량을 검증하기 위한 센서 및 제어계로 구성된다.According to the present invention, a cutting system using in-process measurement is composed of an in-process measuring device for measuring the motion error of the main shaft and a tool feed device for moving the tool by a small amount. The in-process measuring device consists of a sensor, a reference plane, and a calculation unit that determines the microfeed amount of the tool by using the sensor output obtained by the measurement.The tool feeder is a driver for moving the tool and a sensor for verifying the tool feed amount. And a control system.
Description
제1도는 인프로세스 측정을 이용한 가공 개념도1 is a conceptual diagram of machining using in-process measurement
제2도는 본 발명에 따른 인프로세스 측정장치의 도해도2 is a schematic diagram of an in-process measuring device according to the present invention.
*도면의 주요 부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *
1:비접촉 변위계2:주축1: non-contact displacement meter 2: spindle
3:주축 하우징4:주축 베어링3: spindle housing 4: spindle bearing
5:절삭공구6:미소이송용 구동기5: cutting tool 6: drive for micro feed
7:C/V 앰프7: C / V amplifier
본 발명은 인프로세스 측정을 이용한 절삭가공시스템 및 그의 절삭 가공방법에 관해, 보다 상세하게는 회전운동을 하는 주축의 오차를 측정하여 다음 가공점의 주측 오차를 예측하고 그 오차량을 공구대를 움직여 보상하는 절삭가공시스템 및 그의 절삭가공방법에 관한 것이다.The present invention relates to a cutting processing system using in-process measurement and a cutting processing method thereof, and more specifically, to measure the error of the main axis in the rotational movement to predict the main error of the next machining point and to move the tool bar The present invention relates to a compensating cutting system and a cutting method thereof.
종래 기술에 따르면, 기 가공된 면을 기준으로 하여 그 기준면에 대해 보상량을 결정함으로써, 평면 절삭은 가능하나 곡면절삭이 요구될 경우 오차가 누적되어 가공 정도가 떨어지게 되었다. 또 측정 기준점이 공구와 같은 면에 놓이게 되어 실제 가공시 절삭유동에 의한 오염등의 문제가 있었다.According to the prior art, by determining the compensation amount for the reference surface on the basis of the machined surface, the plane cutting is possible, but when the surface cutting is required, the error accumulates and the degree of processing decreases. In addition, since the measurement reference point is placed on the same plane as the tool, there is a problem such as contamination due to cutting flow during actual machining.
따라서, 본 발명의 목적은 회전기구의 특성에 의한 회전운동오차를 실시간 예측을 통하여 보상하는 절삭가공시스템 및 그의 절삭가공방법을 제공하는 데 있다.Accordingly, an object of the present invention is to provide a cutting processing system and a cutting method thereof for compensating the rotational motion error due to the characteristics of the rotating mechanism through real-time prediction.
본 발명에 따르면, 인프로세스 측정을 이용한 절삭가공 시스템은 주축의 운동오차를 측정하는 인프로세스 측정장치와 공구를 미소량 움직이는 공구 이송장치로 구성되어 있다. 인프로세스 측정장치는 센서, 측정기준면, 그리고 측정에 의해 얻어진 센서출력을 이용하여 공구의 미소이송량을 결정하는 연산부로 이루어져 있으며, 공구 이송장치는 공구를 움직이기 위한 구동기, 공구 이송량을 검증하기 위한 센서 및 제어계로 구성된다.According to the present invention, the cutting system using the in-process measurement is composed of an in-process measuring device for measuring the motion error of the main shaft and a tool feed device for moving the tool by a small amount. The in-process measuring device consists of a sensor, a reference plane, and a calculation unit that determines the microfeed amount of the tool by using the sensor output obtained by the measurement.The tool feeder is a driver for moving the tool and a sensor for verifying the tool feed amount. And a control system.
또한 본 발명에 따른 인프로세스 측정을 이용한 절삭가공법은 주축이 회전할 때 센서가 설치되어 있는 각 부분의 위치를 센서로부터 알아내는 단계, 센서의 출력을 가하학적 모양을 이용하여 계산을 통해 현시점의 주축의 운동오차를 계산하는 단계, 계산된 현시점의 주축운동오차와 이전에 얻어진 주축의 운동오차를 이용하여 다음 시점의 주측 운동오차를 예측하는 단계, 예측된 주축의 운동오차를 이용하여 공구위치에서의 공구 이송량을 결정하는 단계, 및 결정된 공구 이송량을 공구제어부의 지령치로 입력하여 공구로 하여금 그 지령치를 추종하게 하는 단계로 이루어진다.In addition, the cutting method using the in-process measurement according to the present invention is to find the position of each part where the sensor is installed when the main axis is rotated from the sensor, the output of the sensor using a geometrical shape to calculate the main axis of the current point Estimating the motion error of the motor, predicting the main motion error of the next time point using the calculated main axis motion error and the previously obtained motion error of the main axis, and using the predicted motion error of the main axis at the tool position. Determining a tool feed amount, and inputting the determined tool feed amount as a command value of the tool control unit to cause the tool to follow the command value.
이하, 첨부도면을 참고로 하여 본 발명의 실시예를 설명하기로 한다.Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
제1도는 본 발명에 따른 인프로세스 측정장치의 도해도로서, 절삭기계, 예컨대 선반(lathe)의 주축(1)과 주축하우징(2)에 다수의 비접촉 변위계(3)가 배치된다. 주축(1)의 전방 중심선에는 절삭공구(4)가 공구대의 미소이송용구동기(5)에 의해 체결되어 위치한다. 상기 비접촉변위계(3), 즉 센서는 제2도에 도시한 바와 같이 각기 C/V앰프(7)에 접속되어 그 변위량이 연산기(8)로 들어가서 연산된다. 상기 연산기에 의해 얻어진 이송량은 공구대 이송제어기(9) 및 앰프(10)를 통해 구동기(11)로 전달되어 상기 절삭공구(4)를 이송시킨다. 미설명 부호 6는 주축베어링이다.1 is a schematic diagram of an in-process measuring apparatus according to the present invention, in which a plurality of non-contact displacement meters 3 are arranged on a spindle 1 and a spindle housing 2 of a cutting machine, such as a lathe. The cutting tool 4 is fastened to the front centerline of the main shaft 1 by a small feed driver 5 of the tool post. The non-contact displacement gauge 3, i.e., the sensor, is respectively connected to the C / V amplifier 7 as shown in FIG. 2, and the displacement amount enters the calculator 8 and is calculated. The feed amount obtained by the calculator is transferred to the driver 11 through the tool bar feed controller 9 and the amplifier 10 to feed the cutting tool 4. Reference numeral 6 is a spindle bearing.
다음은 본 발명에 따른 인프로세스측정을 이용한 절삭가공방법을 설명하기로 한다.Next, a cutting method using in-process measurement according to the present invention will be described.
일차적으로 주축(1)이 회전할 때 각 센서 즉, 다수의 비접촉변위계(3)가 설치되어 있는 각 부분의 위치를 센서(3)로부터 알아낸다. 그리고 센서(3)의 출력을 기하학적 모양을 이용하여 계산을 통해 현시점의 주축의 운동오차를 계산한다. 계산된 현시점의 주축운동오차와 이전에 얻어진 주축 운동오차를 이용하여 다음 시점의 주축운동오차를 예측한다. 예측된 주축(1)의 운동오차를 이용하여 공구위치에서의 공구이송량을 결정한다. 결정된 공구이송량을 공구제어부의 지령치로 입력하여 공구로 하여금 그 지령치를 추종하게 된다.First, when the main shaft 1 rotates, the position of each sensor, that is, each part in which a plurality of non-contacting displacement meters 3 are installed, is determined from the sensor 3. Then, the motion error of the main axis of the present point of time is calculated by calculating the output of the sensor 3 using the geometric shape. The main axis motion error of the next point is predicted using the calculated main axis motion error and the previously obtained main axis motion error. The tool feed amount at the tool position is determined using the predicted motion error of the spindle 1. The determined tool feed amount is input as a command value of the tool control unit so that the tool follows the command value.
본 발명에서는 5개의 센서를 사용하는 시스템을 제안하였으나 기하학적 고찰에 의해 센서의 량을 3개 또는 2개로 축소하여 사용할 수 있다. 또 다양한 구동기를 사용할 수 있으며 구동기의 특성에 따라 폐루프제어를 선택적으로 할 수 있다. 또한 이전에 극복하기 힘들었던 회전주축의 운동오차를 줄임으로써 보다 정밀한 가공을 할 수 있다. 또 절삭가공 뿐만 아니라 역으로 미소 이송의 특성을 이용하여 초정밀 측정도 할 수 있다.In the present invention, a system using five sensors is proposed, but the amount of sensors can be reduced to three or two by geometric considerations. In addition, various drivers can be used, and closed-loop control can be selectively performed according to the characteristics of the driver. In addition, more precise machining can be achieved by reducing the motion error of the rotating spindle, which was previously difficult to overcome. In addition to cutting, it is also possible to perform ultra-precise measurements using the characteristics of microfeeds.
Claims (5)
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KR1019960080914A KR100243505B1 (en) | 1996-12-31 | 1996-12-31 | Cutting process system using inprocess measuring and its process |
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KR1019960080914A KR100243505B1 (en) | 1996-12-31 | 1996-12-31 | Cutting process system using inprocess measuring and its process |
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KR19980061543A true KR19980061543A (en) | 1998-10-07 |
KR100243505B1 KR100243505B1 (en) | 2000-03-02 |
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