KR100653889B1 - An over shut protect structure of the servo actuator - Google Patents

An over shut protect structure of the servo actuator Download PDF

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Publication number
KR100653889B1
KR100653889B1 KR1020060002133A KR20060002133A KR100653889B1 KR 100653889 B1 KR100653889 B1 KR 100653889B1 KR 1020060002133 A KR1020060002133 A KR 1020060002133A KR 20060002133 A KR20060002133 A KR 20060002133A KR 100653889 B1 KR100653889 B1 KR 100653889B1
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KR
South Korea
Prior art keywords
piston
servo actuator
return
cylinder
overshoot
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Application number
KR1020060002133A
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Korean (ko)
Inventor
조정현
김고도
이현철
신행봉
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에스지서보(주)
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Priority to KR1020060002133A priority Critical patent/KR100653889B1/en
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Publication of KR100653889B1 publication Critical patent/KR100653889B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1447—Pistons; Piston to piston rod assemblies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/76—Control of force or torque of the output member

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

An over shut protect structure of a servo actuator is provided to prevent the quality inferiority of processed goods by changing the structure of a piston tip portion and the position of a cylinder return path. In an over shut protect structure of a servo actuator(10), a return path(16) gate of a servo actuator return unit(14) is installed by being separated from a cylinder lower dead point(17) by an interval of an inclination unit(18) formed at the end portion of a piston. The inclination unit of a predetermined angle to a cylinder liner is installed at the end portion of the piston. An over shut phenomenon of the servo actuator is prevented by limiting the oil outflow amount of the return unit when pressing the piston.

Description

서보액추에이터의 오버슈트 방지구조{An over shut protect structure of the servo actuator}An over shut protect structure of the servo actuator

도 1은 서보액추에이터의 오버슈트 현상을 설명하기 위한 압력·시간 곡선도1 is a pressure and time curve diagram for explaining the overshoot phenomenon of the servo actuator;

도 2는 본 발명 서보액추에이터의 오버슈트 방지구조에 대한 단면도Figure 2 is a cross-sectional view of the overshoot prevention structure of the present invention servo actuator

도 3은 도 2의 'A' 상세도3 is a detailed view 'A' of FIG.

※ 도면의 주요부분에 대한 부호의 설명※ Explanation of code for main part of drawing

10. 서보액추에이터10. Servo Actuator

11. 피스톤11.piston

12. 가압부12. Pressurization

13. 가압유로13. Pressurized flow path

14. 리턴부14. Return section

15. 로드15. Load

16. 리턴유로16. Euro return

17. 하사점17. Bottom dead center

18. 경사부18. Slope

본 발명은 서보액추에이터의 오버슈트(OVER SHUT)를 방지하는 것에 관한 것으로, 보다 상세하게는 비교적 소용량의 유압프레스와 같이 왕복싸이클이 짧은 서보액추에이터에서 피스톤이 하사점에 이르렀을때 순간적으로 설정압력 이상의 오버슈트가 발생하는 것을 방지하는 구성에 관한 것이다.The present invention relates to preventing overshoot of a servo actuator, and more particularly, when a piston reaches a bottom dead center in a servo actuator having a short reciprocating cycle, such as a hydraulic press of a relatively small capacity, a moment is higher than a set pressure. A configuration for preventing overshoot from occurring.

일반적으로 냉간단조 등과 같은 작업을 위하여는 가압력의 조절이 용이한 유압프레스가 널리 사용되며 냉간단조용 유압프레스는 비교적 소용량이면서 빠른 왕복싸이클 타임을 갖도록 설계되어 생산성을 향상할 수 있도록 제작되나 유압피스톤의 작동속도가 빠를 경우 피스톤이 하사점에 이르렀을때에는 오버슈트현상이 발생하여 순간적으로 설정압력이상의 압력이 발생하며 이로 인해 냉간단조재료에 과도한 압력이 작용하면서 가공불량이 발생하는 요인이 되었다.In general, for presses such as cold forging, hydraulic presses, which can easily adjust the pressing force, are widely used. Hydraulic presses for cold forging are designed to improve productivity by being designed with relatively small capacity and fast reciprocating cycle time. When the operating speed is high, when the piston reaches the bottom dead center, an overshoot phenomenon occurs, and a pressure exceeding the set pressure is instantaneously generated, which causes excessive pressure on the cold forged material, which causes processing defects.

종래에는 서보액추에이터의 오버슈트를 방지하기 위하여 서보액추에이터에 피스톤의 위치를 검출하는 위치센서와 유량제어밸브를 구비하여 피스톤의 위치가 하사점 근처에 도달하면 제어기로 유량을 제어하여 피스톤의 속도를 서서히 감소시켜 오버슈트가 발생하는 것을 방지할 수 있게 한 것이 공지되어 있었다.Conventionally, in order to prevent overshoot of the servo actuator, the servo actuator is provided with a position sensor and a flow control valve for detecting the position of the piston. When the piston reaches the bottom dead center, the controller controls the flow rate to gradually increase the speed of the piston. It has been known to reduce such that overshoot can be prevented from occurring.

그러나 상기와 같은 방법은 위치센서와 유량제어밸브 및 제어기와 같은 고가의 부품을 필요로 하여 비용부담이 과중하고 유량제어에 따른 피스톤 속도의 감속 으로 왕복싸이클 타임이 길어져 생산성을 저해한다는 문제점이 있었다.However, such a method requires expensive components such as a position sensor, a flow control valve and a controller, and has a problem in that the cost burden is excessive and the reciprocating cycle time is increased due to the reduction of the piston speed due to the flow control, thereby inhibiting productivity.

본 발명은 상기와 같은 문제점을 해결하기 위하여 개발된 것으로 서보액추에이터의 오버슈트 현상을 제거함에 있어서 피스톤의 구조를 개선하여 피스톤이 하사점 근처에 도달하면 피스톤에 의하여 오일유출 통로를 점진적으로 폐쇄할 수 있도록 하여 오버슈트 현상을 방지할 수 있게 하는 구성을 제공하는 것을 목적으로 한다.The present invention was developed to solve the above problems, and when the piston reaches the bottom dead center by improving the structure of the piston in removing the overshoot phenomenon of the servo actuator, the oil flow passage can be gradually closed by the piston. It is an object of the present invention to provide a configuration capable of preventing overshoot.

본 발명의 또 다른 목적은 서보액추에이터의 왕복싸이클 타임의 지연을 최소화하여 생산성을 저하시키지 않게 하는 것이다.Another object of the present invention is to minimize the delay of the reciprocating cycle time of the servo actuator so as not to reduce productivity.

상기한 목적을 달성하기 위한 본 발명 '서보액추에이터의 오버슈트 방지구조'는 서보액추에이터의 리턴측 피스톤의 단부를 실린더의 내벽에 대하여 일정각도로 경사지게 구성하고 서보액추에이터의 유압유 배출구를 실린더의 바닥면에서 피스톤의 경사진 부분의 거리만큼 이격시켜 형성하여 피스톤이 유압배출구에 접근하면서 피스톤의 경사부에 의하여 유압배출로를 점진적으로 폐쇄토록 함으로서 유출유량을 감소시켜 피스톤의 하강속도를 감소하게 함으로서 일정한 가압력을 유지하면서 오버슈트가 발생하는 것을 방지하는 구성을 채택한다.In the present invention, 'overshoot prevention structure of the servo actuator' for achieving the above object is configured by inclining the end of the return side piston of the servo actuator at an angle with respect to the inner wall of the cylinder and the hydraulic oil outlet of the servo actuator at the bottom surface of the cylinder. It is formed by the distance of the inclined part of the piston so that the piston approaches the hydraulic outlet and gradually closes the hydraulic outlet path by the inclined part of the piston, thereby reducing the outflow flow rate and reducing the descending speed of the piston. Adopt a configuration that prevents overshoot while maintaining.

이하에서 본 발명의 바람직한 실시예를 첨부한 도면을 참조하여 상세하게 설 명하기로 한다.Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

도 1은 서보액추에이터의 오버슈트 현상을 설명하기 위한 압력·시간 곡선도이고, 도 2는 본 발명 '서보액추에이터의 오버슈트 방지구조'에 대한 단면도이고, 도 3은 도 2의 A부의 상세도이다.1 is a pressure and time curve diagram for explaining the overshoot phenomenon of the servo actuator, Figure 2 is a cross-sectional view of the "overshoot prevention structure of the servo actuator" of the present invention, Figure 3 is a detailed view of part A of FIG. .

도면에 도시된 것과 같이 서보액추에이터(10)에 내장되는 피스톤(11)은 가압부(12)측의 가압유로(13)를 통하여 압유가 공급되면 피스톤(11)은 리턴부(14)측으로 밀려나면서 로드(15)에 가압력이 발생하고 리턴부(14)의 오일은 리턴유로(16)를 통하여 배출된다.As shown in the drawing, the piston 11 embedded in the servo actuator 10 is supplied with the pressurized oil through the pressure passage 13 on the pressurizing portion 12 side, and the piston 11 is pushed toward the return portion 14 side. A pressing force is generated on the rod 15 and oil of the return portion 14 is discharged through the return passage 16.

이때 피스톤(11) 및 로드(15)에 관성력이 작용하여 하사점(17)부근에서는 가압오일의 압력보다 더 높은 압력인 오버슈트가 순간적으로 발생한다.At this time, an inertial force acts on the piston 11 and the rod 15 so that an overshoot, which is higher than the pressure of the pressurized oil, is instantaneously generated near the bottom dead center 17.

도 1의 'A'는 통상적인 서보액추에이터의 오버슈트 현상을 나타내는 압력·시간 곡선이며, 'B'는 위치센서와 유량밸브로 제어할 경우의 압력·시간곡선이며, 'C'는 본 발명이 적용된 압력·시간 곡선이다.'A' in Fig. 1 is a pressure and time curve showing an overshoot phenomenon of a conventional servo actuator, 'B' is a pressure and time curve when the position sensor and the flow valve are controlled, and 'C' is the present invention. The pressure and time curve applied.

본 발명에서는 서보액추에이터(10)의 리턴부(14)측 유출유량을 제어하여 피스톤(11)에 가해지는 관성력을 상쇄시켜 오버슈트 현상을 방지할 수 있도록 통상 하사점(17)부근에 형성되는 리터유로(16)의 입구를 하사점(17)보다 일정거리를 이격하여 형성하며, 하사점(17)과 리턴유로(16)의 입구가 형성되는 간격만큼 피스톤(11)의 리턴부(14)측 선단부에 경사부(18)를 형성한다.In the present invention, a liter formed near the bottom dead center 17 so as to control the outflow of the return portion 14 side of the servo actuator 10 to cancel the inertia force applied to the piston 11 to prevent the overshoot phenomenon. The inlet of the flow path 16 is formed to be spaced apart from the bottom dead center 17 by a predetermined distance, and the return portion 14 side of the piston 11 is formed by an interval at which the bottom dead center 17 and the inlet of the return flow path 16 are formed. An inclined portion 18 is formed at the tip portion.

피스톤(11)이 리턴부(14)의 하사점(17)에 접근하면서 피스톤 선단부가 리턴유로(16)의 입구에 도달하면 피스톤(11)에 의하여 리턴유로(16)의 입구가 가려지면 서 피스톤경사부(18)와 실린더 라이너사이의 간격으로 오일이 제한적으로 통과하면서 리턴유로(16)로 배출하고 피스톤(11)이 더욱 하사점(17)으로 접근하면 경사부(18)의 틈새는 더욱 좁아지면서 리턴유로(16)로 유출되는 오일의 양은 급속히 감소된다.When the piston 11 approaches the bottom dead center 17 of the return portion 14 and the piston tip reaches the inlet of the return passage 16, the piston 11 obscures the inlet of the return passage 16. As the oil passes through the inclined portion 18 and the cylinder liner with limited flow, the oil is discharged into the return flow path 16 and the piston 11 approaches the bottom dead center 17, so that the gap between the inclined portion 18 becomes narrower. The amount of oil flowing into the return flow path 16 is rapidly reduced.

따라서 피스톤(11)의 전진에 따른 관성력이 제거되면서 피스톤(11)의 전진속도는 급속히 감소되나 가압부(12)에서 가해지는 유압은 일정하므로 가압력은 변하지 않는다.Therefore, as the inertia force of the piston 11 is removed, the forward speed of the piston 11 is rapidly decreased, but the hydraulic pressure applied from the pressurizing portion 12 is constant, so the pressing force is not changed.

이상에서 설명한 바와 같이 본 발명은 피스톤 선단부의 구조와 실린더 리턴유로의 위치만 변경하는 것으로 서보액추에이터의 오버슈트 현상을 방지할 수 있어 가공물의 품질불량을 방지하게 할 수 있고, 왕복동 싸이클타임도 지연시키지 않아 생산성을 저하하지 않게 하는 효과가 있다.As described above, the present invention can prevent overshooting of the servo actuator by changing only the structure of the piston tip and the position of the cylinder return flow path, thereby preventing the quality defect of the workpiece and also reducing the reciprocating cycle time. There is an effect that does not lower the productivity.

Claims (1)

실린더와 피스톤을 구비하고 유압에 의하여 가압 및 리턴하는 서보액추에이터에 있어서,In a servo actuator having a cylinder and a piston and pressurized and returned by hydraulic pressure, 서보액추에이터(10) 리턴부(14)의 리턴유로(16)입구를 실린더 하사점(17)에서 피스톤 단부에 형성된 경사부(18)의 간격만큼 이격하여 설치하고 피스톤(11)의 단부에는 실린더 라이너에 대하여 일정각도의 경사부(18)를 형성하여 피스톤에 대한 가압작동시 리턴부의 오일유출량을 피스톤 경사부에 의하여 제한하여 서보액추에이터의 오버슈트 현상을 방지할 수 있게 한 것을 특징으로 하는 서보액추에이터의 오버슈트 방지구조.The return flow path 16 of the servo actuator 10 return unit 14 is installed at a cylinder bottom dead center 17 spaced apart by the interval of the inclined portion 18 formed at the piston end, and the cylinder liner is disposed at the end of the piston 11. The inclined portion 18 at a predetermined angle with respect to the servo actuator, characterized in that to prevent the overshoot phenomenon of the servo actuator by limiting the oil outflow amount of the return portion by the piston inclined portion during the pressurizing operation to the piston Overshoot prevention structure.
KR1020060002133A 2006-01-09 2006-01-09 An over shut protect structure of the servo actuator KR100653889B1 (en)

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