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KR100641599B1 - How to control the amount of gas injected into the barrel of the injection molding machine by the pressure change of the gas line and the barrel - Google Patents

How to control the amount of gas injected into the barrel of the injection molding machine by the pressure change of the gas line and the barrel Download PDF

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KR100641599B1
KR100641599B1 KR1020040051681A KR20040051681A KR100641599B1 KR 100641599 B1 KR100641599 B1 KR 100641599B1 KR 1020040051681 A KR1020040051681 A KR 1020040051681A KR 20040051681 A KR20040051681 A KR 20040051681A KR 100641599 B1 KR100641599 B1 KR 100641599B1
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gas
injection molding
pressure
molding machine
barrel
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KR20060002579A (en
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한동엽
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주식회사 프라코
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/76Measuring, controlling or regulating
    • B29C45/77Measuring, controlling or regulating of velocity or pressure of moulding material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76Measuring, controlling or regulating
    • B29C2945/76494Controlled parameter
    • B29C2945/76498Pressure
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76Measuring, controlling or regulating
    • B29C2945/76655Location of control
    • B29C2945/76658Injection unit
    • B29C2945/76668Injection unit barrel
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2945/00Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76Measuring, controlling or regulating
    • B29C2945/76929Controlling method
    • B29C2945/76939Using stored or historical data sets

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

본 발명은 사출 성형기의 가스공급장치의 전원이 “온”되면 액추에이터의 니들밸브를 열어 가스 압축기로부터 공급되는 가스를 가스라인의 압력이 일정압력이 되기까지 주입하는 제1단계와, 상기 가스라인의 압력이 일정압력까지 상승되면 액추에이터의 니들밸브를 닫고 스크류 회전감지센서의 계량 작동신호를 분석하여 스크류가 회전하는지를 확인하는 제2단계와, 상기 스크류가 회전되면 스크류의 회전으로 변화하는 가스라인의 압력과 사출 성형기 배럴의 압력을 감지하고, 가스라인과 사출 성형기 배럴의 압력차이가 일정압력까지 근접하는지를 확인하는 제3단계와, 상기 가스라인과 사출 성형기 배럴의 압력차이가 일정압력 이내로 근접하게 되면 가스 콘트롤밸브를 열어 가스라인의 가스를 사출 성형기 배럴에 주입하면서 가스라인과 사출 성형기 배럴의 압력변화를 감시하는 제4단계와, 상기 제4단계의 감시결과, 가스라인과 사출 성형기 배럴의 압력차이가 일정압력까지 근접하게 되면 가스 콘트롤밸브를 닫고 액추에이터의 니들밸브를 열어 가스 압축기의 가스를 가스라인에 주입하는 제5단계를 통해 제품을 사출 성형함으로써 제품을 사출 성형할 때 주원료로 사용되는 수지의 종류나 제품에 특성에 맞는 제품을 사출 성형할 수 있는 효과가 있다.The present invention is the first step of opening the needle valve of the actuator when the power supply of the gas supply device of the injection molding machine is "on" and injecting the gas supplied from the gas compressor until the pressure of the gas line is a constant pressure, When the pressure rises to a certain pressure, the second step of closing the actuator's needle valve and analyzing the metering operation signal of the screw rotation sensor to check whether the screw is rotating, and the pressure of the gas line which is changed by the rotation of the screw when the screw is rotated And a third step of detecting the pressure of the injection molding machine barrel and checking whether the pressure difference between the gas line and the injection molding machine barrel is close to a predetermined pressure, and when the pressure difference between the gas line and the injection molding machine barrel approaches within a certain pressure, Open the control valve and inject gas from the gas line into the injection molding machine barrel The fourth step of monitoring the pressure change of the mold barrel and the monitoring result of the fourth step, if the pressure difference between the gas line and the injection molding machine barrel approaches to a certain pressure, close the gas control valve and open the needle valve of the actuator to open the gas compressor. The injection molding of the product through the fifth step of injecting the gas into the gas line has the effect of injection molding a product suitable for the type of resin used as the main raw material or characteristics of the product.

사출성형기. 가스라인. 배럴. 압력변화. 가스. 수지. Injection molding machine. Gas line. Barrel. Pressure change. gas. Suzy.

Description

가스라인과 배럴의 압력변화에 의해 사출 성형기의 배럴에 주입되는 가스량을 조절하는 방법{The Adjustable Method for Gas}The amount of gas injected into the barrel of the injection molding machine by the pressure change of the gas line and the barrel {The Adjustable Method for Gas}

도1은 본 발명에 의해 가스라인과 배럴의 압력변화에 의해 사출 성형기의 배럴에 주입되는 가스량을 조절하기 위한 시스템 구성도이다.1 is a system configuration diagram for adjusting the amount of gas injected into the barrel of the injection molding machine by the pressure change of the gas line and the barrel according to the present invention.

도2는 본 발명에 의해 가스라인과 배럴의 압력변화에 의해 사출 성형기의 배럴에 주입되는 가스량을 조절하는 과정을 보인 흐름도이다. Figure 2 is a flow chart illustrating a process of adjusting the amount of gas injected into the barrel of the injection molding machine by the pressure change of the gas line and the barrel according to the present invention.

- 도면의 주요 부분에 대한 부호의 설명 --Explanation of symbols for the main parts of the drawing-

10 : 콘트롤러 11 : 가스 압축기10 controller 11 gas compressor

12 : 사출성형기 배럴 13 : 액추에이터 니들밸브12: injection molding machine barrel 13: actuator needle valve

14 : 가스 콘트롤밸브 15, 16 : 압력센서14: gas control valve 15, 16: pressure sensor

17 : 타이머 18 : 디스플레이17: timer 18: display

19 : 스크류 회전감지센서 20 : 가스라인19: screw rotation sensor 20: gas line

본 발명은 자동차용 범퍼와 같은 대형 제품을 사출 성형할 때 가스라인과 배럴의 압력변화에 의해 사출 성형기의 배럴에 주입되는 가스량을 조절하는 방법에 관한 것이다. 특히 본 발명은 배럴에 주입되는 수지의 종류나 사출 성형하고자 하는 제품의 특성에 맞게 수지와 함께 가스량을, 스크류의 회전과 가스라인의 가스를 배럴에 주입함에 따라 변화하는 가스라인과 배럴의 압력변화에 따라 조절할 수 있도록 하는 가스라인과 배럴의 압력변화에 의해 사출 성형기의 배럴에 주입되는 가스량을 조절하는 방법에 관한 것이다.The present invention relates to a method of controlling the amount of gas injected into a barrel of an injection molding machine by a pressure change of a gas line and a barrel when injection molding a large product such as an automobile bumper. In particular, the present invention according to the type of resin injected into the barrel or the characteristics of the product to be injection molded, the amount of gas with the resin, the rotation of the screw and the gas line and the pressure change of the barrel changes as the gas of the gas line is injected into the barrel It relates to a method of controlling the amount of gas injected into the barrel of the injection molding machine by the pressure change of the gas line and the barrel to be adjusted according to.

통상적인 사출성형(injection molding)은 수지 특히 고분자 재료를 높은 온도로 가열 용융시켜서 유용상태로 되는 것을 상당한 압력을 가하여 사출금형 내로 고속 유도하여 넣는 사출 프로세스임을 주시된 바와 같으며, 사출 성형기에 금형을 부착하고, 상기 금형에 충진되도록 하는 성형재료(고분자 재료)를 공급하여 운전하는 것이 기본적인 사출성형의 원리이다.Conventional injection molding is an injection process in which a resin, in particular a polymer material, is heated and melted at a high temperature to be usable and subjected to high speed induction into an injection mold by applying considerable pressure. The basic principle of injection molding is to supply and operate a molding material (polymer material) which is attached and filled into the mold.

이와 같이 고분자 재료를 이용하여 사출성형을 할 경우, 강도 증가 등의 디자인 요구에 의해 두꺼운 부분이 존재하는 경우가 있게 되는데, 이와 같은 두꺼운 부분의 냉각지연으로 인한 수축이나 변형 등의 불량이 발생되는 것을 방지하기 위해 성형 중에 성형품 내부로 공기나 가스 등을 주입하는 성형법이 이용되고 있다.In the case of injection molding using a polymer material as described above, a thick part may exist due to a design request such as an increase in strength, and defects such as shrinkage or deformation due to cooling delay of such a thick part may occur. In order to prevent this, a molding method of injecting air or gas into the molded article during molding is used.

즉, 종래의 사출 성형기는 사출 성형기의 배럴 일측에 가스를 주입할 수 있는 가스 주입구를 설치하고, 상기 가스 주입구의 끝부분은 가스 주입구를 통해 배럴 내로 분사되는 가스가 미세하게 분사되도록 소형의 분사공으로 제작함으로써 배럴 내로 수지와 함께 가스가 주입되면서 혼합되어 제품을 성형할 때 기포가 형성되도록 하는 것이다.That is, the conventional injection molding machine is provided with a gas inlet for injecting gas to one side of the barrel of the injection molding machine, the end of the gas inlet is a small injection hole so that the gas injected into the barrel through the gas inlet finely injected By manufacturing, the gas is injected together with the resin into the barrel and mixed so that bubbles are formed when the product is molded.

통상적으로 사출 성형기를 이용하여 사출 성형하는 제품들은 원료로 사용하 는 수지의 종류나 해당 제품의 특성에 따라 수지와 함께 배럴에 주입되는 가스의 주입시간과 가스량을 달리하여야 원하는 특성을 가지는 제품들을 사출 성형할 수 있으나, 종래에는 수지의 종류나 제품의 특성에 관계없이 수지와 함께 배럴에 주입되는 가스량을 일정하게 유지함으로써 수지의 종류나 제품의 특성에 맞는 사출성형이 이루어지지 않는다.In general, products that are injection-molded using an injection molding machine need to change the injection time and gas amount of the gas injected into the barrel with the resin according to the type of resin used as the raw material or the characteristics of the product to inject the products having the desired characteristics. Although it can be molded, conventionally, injection molding is not performed in accordance with the type of resin or the characteristics of the product by maintaining a constant amount of gas injected into the barrel with the resin regardless of the type of resin or the characteristics of the product.

본 발명의 목적은 특정 제품을 성형하고자 하는 수지와 함께 스크류의 회전과 가스라인의 가스를 배럴에 주입함에 따라 변화하는 가스라인과 배럴의 압력변화에 의해 사출 성형기 배럴에 공급되는 가스량을 정확하게 조절함으로써 제품을 사출 성형할 때 주원료로 사용되는 수지의 종류나 제품에 특성에 맞는 제품을 사출 성형할 수 있도록 하는 가스라인과 배럴의 압력변화에 의해 사출 성형기의 배럴에 주입되는 가스량을 조절하는 방법을 제공하는데 있다. An object of the present invention is to precisely control the amount of gas supplied to the barrel of the injection molding machine by changing the pressure of the gas line and the barrel changes with the rotation of the screw and the gas of the gas line into the barrel with the resin to form a specific product Provides a method of controlling the amount of gas injected into the barrel of the injection molding machine by changing the pressure of the gas line and the barrel to enable injection molding of products suitable to the type of resin or product characteristics used as the main raw material when injection molding the product. It is.

본 발명에 의한 가스라인과 배럴의 압력변화에 의해 사출 성형기의 배럴에 주입되는 가스량을 조절하는 방법은, 사출 성형기의 가스공급장치의 전원이 “온”되면 액추에이터의 니들밸브를 열어 가스 압축기로부터 공급되는 가스를 가스라인의 압력이 일정압력이 되기까지 주입하는 제1단계와, 상기 가스라인의 압력이 일정압력까지 상승되면 액추에이터의 니들밸브를 닫고 스크류 회전감지센서의 계량 작동신호를 분석하여 스크류가 회전하는지를 확인하는 제2단계와, 상기 스크류가 회전되면 스크류의 회전으로 변화하는 가스라인의 압력과 사출 성형기 배럴의 압력을 감지하고, 가스라인과 사출 성형기 배럴의 압력차이가 일정압력까지 근접하는지를 확인하는 제3단계와, 상기 가스라인과 사출 성형기 배럴의 압력차이가 일정압력 이내로 근접하게 되면 가스 콘트롤밸브를 열어 가스라인의 가스를 사출 성형기 배럴에 주입하면서 가스라인과 사출 성형기 배럴의 압력변화를 감시하는 제4단계 및 상기 제4단계의 감시결과, 가스라인과 사출 성형기 배럴의 압력차이가 일정압력까지 근접하게 되면 가스 콘트롤밸브를 닫고 액추에이터의 니들밸브를 열어 가스 압축기의 가스를 가스라인에 주입하는 제5단계를 포함하는 것을 특징으로 한다.The method of controlling the amount of gas injected into the barrel of the injection molding machine by the pressure change of the gas line and the barrel according to the present invention, when the power supply of the gas supply device of the injection molding machine is "on", the needle valve of the actuator is supplied and supplied from the gas compressor The first step of injecting the gas into the gas line until the pressure of the gas line reaches a constant pressure, and when the pressure of the gas line rises to the constant pressure, the needle valve of the actuator is closed and the screw is analyzed by analyzing the metering operation signal of the screw rotation sensor. The second step of checking whether the rotation, and if the screw is rotated, the pressure of the gas line and the injection molding machine barrel pressure changes by the rotation of the screw, and the pressure difference between the gas line and the injection molding machine barrel close to a certain pressure And the pressure difference between the gas line and the barrel of the injection molding machine is approached within a predetermined pressure. The gas control valve is opened to inject the gas from the gas line into the injection molding machine barrel while monitoring the pressure change of the gas line and the injection molding machine barrel. And a fifth step of closing the gas control valve and opening the needle valve of the actuator to inject the gas of the gas compressor into the gas line when the difference approaches the predetermined pressure.

또한 본 발명에 있어서, 상기 액추에이터의 니들밸브를 개폐시키는 기준이 되는 가스라인의 압력과 상기 가스 콘트롤밸브를 개폐시키는 기준이 되는 가스라인과 사출 성형기 배럴의 압력차이값은, 수지의 종류나 사출 성형하고자 하는 제품의 특성에 따라 사전에 임의로 설정되는 것이 바람직하다.In the present invention, the pressure difference between the pressure of the gas line serving as the reference for opening and closing the needle valve of the actuator and the pressure difference between the gas line serving as the reference for opening and closing the gas control valve and the barrel of the injection molding machine is a kind of resin or injection molding. It is preferable to set arbitrarily in advance according to the characteristic of the product to be made.

또한 본 발명에 있어서, 상기 가스 콘트롤밸브를 열기 위한 가스라인과 사출 성형기 배럴의 압력 차이값은 2000 psi로, 상기 가스 콘트롤밸브를 닫기 위한 가스라인과 사출 성형기 배럴의 압력 차이값은 1000 psi로 설정할 수 있다.In the present invention, the pressure difference between the gas line for opening the gas control valve and the injection molding machine barrel is set to 2000 psi, the pressure difference between the gas line for closing the gas control valve and the injection molding machine barrel is set to 1000 psi Can be.

이하, 본 발명을 상세히 설명한다.Hereinafter, the present invention will be described in detail.

도1은 본 발명에 의해 가스라인과 배럴의 압력변화에 의해 사출 성형기의 배럴에 주입되는 가스량을 조절하기 위한 시스템 구성도로서, 이는 사출 성형기 배럴(12)에 특정 제품을 사출 성형하기 위한 원재료인 수지와 가스, 즉 질소가스를 주입하여 제품을 사출 성형하기 위한 시스템이다.1 is a system configuration for controlling the amount of gas injected into the barrel of the injection molding machine by the pressure change of the gas line and the barrel according to the present invention, which is a raw material for injection molding a specific product in the injection molding machine barrel 12 It is a system for injection molding products by injecting resin and gas, that is, nitrogen gas.

상기 사출 성형기 배럴(12)은 수지와 가스를 수용할 수 있도록 구성된 것으 로서, 상기 사출 성형기 배럴(12)에는 스크류 회전에 따라 계량 작동신호를 생성시켜 콘트롤러(10)에 제공하는 스크류 회전감지센서(19)와 사출 성형기 배럴(10)의 내부압력을 감지하고 이를 콘트롤러(10)에 제공하는 압력센서(15)가 구비되어 있다.The injection molding machine barrel 12 is configured to accommodate the resin and gas, the injection molding machine barrel 12 is a screw rotation detection sensor for generating a metering operation signal according to the screw rotation to provide to the controller 10 ( 19) and a pressure sensor 15 for detecting the internal pressure of the injection molding machine barrel 10 and providing it to the controller 10.

또한 사출 성형기에는 가스 압축기(11)로부터 가스라인(20)을 통해 사출 성형기 배럴(12)에 주입되는 가스를 조절하기 위한 가스 콘트롤밸브(14)와 가스 압축기(11)로부터 사출 성형기 배럴(10)에 연결된 가스라인(20)에 공급되는 가스, 즉 질소가스량(압력)을 조절하기 위한 액추에이터의 니들밸브(13)가 구비되어 있다. 상기 가스라인(20)에는 가스압력을 감지하여 콘트롤러(10)에 제공하기 위한 압력센서(16)가 장착되어 있다.In addition, the injection molding machine has a gas control valve 14 for controlling the gas injected into the injection molding machine barrel 12 through the gas line 20 from the gas compressor 11 and the injection molding machine barrel 10 from the gas compressor 11. The needle valve 13 of the actuator for controlling the gas supplied to the gas line 20 connected to the gas, that is, the nitrogen gas amount (pressure) is provided. The gas line 20 is equipped with a pressure sensor 16 for sensing the gas pressure and providing it to the controller 10.

이렇게 스크류 회전감지센서(19)로부터 계량 작동신호를, 압력센서(15)로부터 사출 성형기 배럴(12)의 내부압력에 대한 정보 그리고 압력센서(16)로부터 가스라인(gas line)(20)의 가스압력에 대한 정보를 제공 받은 콘트롤러(10)는 스크류의 회전과 가스라인(20)의 가스를 배럴(12)에 주입함에 따라 변화하는 가스라인(20)과 배럴(12)의 압력변화에 따라 특정 제품을 사출 성형하기 위해 가스 콘트롤밸브(14)와 액추에이터의 니들밸브(13)를 선택적으로 개폐하기 위한 명령을 출력하여 사출 성형기 배럴(12)에 주입되는 가스량을 조절할 수 있다.In this way, the metering operation signal is sent from the screw rotation sensor 19, information about the internal pressure of the injection molding machine barrel 12 from the pressure sensor 15, and the gas of the gas line 20 from the pressure sensor 16. The controller 10 provided with the information on the pressure is specified according to the pressure of the gas line 20 and the barrel 12 that changes as the screw rotates and the gas of the gas line 20 is injected into the barrel 12. The amount of gas injected into the injection molding machine barrel 12 may be adjusted by outputting a command for selectively opening and closing the gas control valve 14 and the needle valve 13 of the actuator for injection molding the product.

도면에서 설명되지 않은 18은 디스플레이(display)로서 가스 압축기(11)로부터 질소 등의 가스가 공급되는 사출기 성형기 배럴(12)에 가스를 공급하는 가스라인(20)의 압력변화와 함께 특정 제품을 사출 성형하는 사출 성형기의 전반적인 공 정에 관련된 각종 정보를 제공하는 역할을 한다.18, which is not described in the drawings, displays a specific product together with a pressure change of the gas line 20 supplying gas to the injection molding machine barrel 12 to which gas such as nitrogen is supplied from the gas compressor 11 as a display. It serves to provide various information related to the overall process of injection molding machine.

도2는 본 발명에서 가스라인과 배럴의 압력변화에 의해 사출 성형기의 배럴에 주입되는 가스량을 조절하는 과정을 보인 흐름도로서, 가스 공급장치를 포함하는 사출 성형기를 구동시키기 위한 전원이 “온”되고 나면(S11), 콘트롤러(10)는 가스라인(20)에 가스를 주입하기 위한 명령을 액추에이터의 니들밸브(13)에 내려(S12), 가스 압축기(11)로부터 가스라인(20)으로 가스가 주입되도록 한다. Figure 2 is a flow chart illustrating a process of adjusting the amount of gas injected into the barrel of the injection molding machine by the pressure change of the gas line and the barrel in the present invention, the power supply for driving the injection molding machine including a gas supply is "on" Afterward (S11), the controller 10 issues a command for injecting gas into the gas line 20 to the needle valve 13 of the actuator (S12), the gas from the gas compressor 11 to the gas line 20 To be injected.

상기 가스 압축기(11)로부터 가스라인(20)으로 가스가 주입되는 동안 콘트롤러(10)는 압력센서(16)의 감지데이터를 분석하여 가스라인(20)의 압력이 일정압력(4000 psi), 즉 사출 성형기 배럴(12)에 가스를 주입하기에 충분한 압력까지 상승하였는지를 확인하게 된다(S13). 그 결과 가스라인(20)의 압력이 임의로 설정한 일정압력(4000 psi) 이상까지 상승된 것으로 확인되면, 콘트롤러(10)는 액추에이터의 니들밸브(13)를 닫아(S14) 가스라인(20)에 더 이상의 가스가 주입되지 않도록 한 후 스크류 회전감지센서(19)의 계량 작동신호를 분석하여 스크류가 회전을 시작하였는지를 확인하게 된다(S15). While gas is injected from the gas compressor 11 into the gas line 20, the controller 10 analyzes the sensing data of the pressure sensor 16 so that the pressure of the gas line 20 is constant pressure (4000 psi), that is, It is checked whether the injection molding machine barrel 12 has risen to a pressure sufficient to inject gas (S13). As a result, when it is confirmed that the pressure of the gas line 20 is raised to a predetermined predetermined pressure (4000 psi) or more, the controller 10 closes the needle valve 13 of the actuator (S14) to the gas line 20. After the gas is no longer injected, the metering operation signal of the screw rotation sensor 19 is analyzed to determine whether the screw starts to rotate (S15).

상기 스크류 회전감지센서(19)의 계량 작동신호를 분석한 결과, 스크류의 회전이 시작된 것으로 확인되면, 콘트롤러(10)는 압력센서(15)(16)의 감지데이터를 분석하여 가스라인(20)과 사출 성형기 배럴(12)의 압력변화를 감지(S16)하고, 가스라인(20)과 사출 성형기 배럴(12)의 압력 차이값을 구한 후 그 압력 차이값이 2000 psi 인지를 확인하게 된다(S17).As a result of analyzing the metering operation signal of the screw rotation detection sensor 19, when it is confirmed that the rotation of the screw is started, the controller 10 analyzes the sensed data of the pressure sensors 15 and 16 to the gas line 20 Then, the pressure change of the injection molding machine barrel 12 is sensed (S16), the pressure difference value of the gas line 20 and the injection molding machine barrel 12 is obtained, and the pressure difference value is 2000 psi (S17). ).

가스라인(20)과 사출 성형기 배럴(12)의 압력 차이값이 2000 psi인 것으로 확인되면, 콘트롤러(10)는 가스라인(20)의 가스를 사출 성형기 배럴(12)에 공급하기 위한 명령을 가스 콘트롤밸브(14)에 내려(S18), 가스라인(20)에 주입된 가스가 가스 콘트롤밸브(14)를 통해 사출 성형기 배럴(12)로 주입되도록 한다. If the pressure difference between the gas line 20 and the injection molding machine barrel 12 is found to be 2000 psi, the controller 10 sends a command to supply the gas of the gas line 20 to the injection molding machine barrel 12. Lowered to the control valve 14 (S18), the gas injected into the gas line 20 to be injected into the injection molding machine barrel 12 through the gas control valve (14).

이때 콘트롤러(10)는 사출 성형기 배럴(12) 내에 설치된 압력센서(15)와 가스라인(20)에 설치된 압력센서(16)의 감지데이터를 분석하여 가스라인(20)으로부터 주입되는 가스에 의해 가스라인(20)과 사출 성형기 배럴(12)의 압력 차이값이 어떻게 변화하는지를 감지하게 된다(S19).At this time, the controller 10 analyzes the sensing data of the pressure sensor 15 installed in the injection molding machine barrel 12 and the pressure sensor 16 installed in the gas line 20, and thus the gas is injected by the gas injected from the gas line 20. It is detected how the pressure difference between the line 20 and the injection molding machine barrel 12 changes (S19).

가스라인(20)과 사출 성형기 배럴(12)의 압력 차이값이 1000 psi인 것으로 확인되면, 콘트롤러(10)는 가스 콘트롤밸브(14)를 닫고 액추에이터의 니들밸브(13)를 열어, 사출 성형기 배럴(12)엔 더 이상 가스가 주입되는 않고 가스라인(20)엔 가스 압축기(11)로부터 공급되는 가스가 주입되도록 한다(S21).When the pressure difference between the gas line 20 and the injection molding machine barrel 12 is found to be 1000 psi, the controller 10 closes the gas control valve 14 and opens the needle valve 13 of the actuator, thereby causing the injection molding machine barrel. The gas supplied from the gas compressor 11 is injected into the gas line 20 without any more gas being injected into the gas 12 (S21).

여기서, 액추에이터의 니들밸브(13)를 개폐시키는 기준이 되는 가스라인(20)의 압력과 상기 가스 콘트롤밸브(14)를 개폐시키는 기준이 되는 가스라인(20)과 사출 성형기 배럴(12)의 압력 차이값은 수지의 종류나 사출 성형하고자 하는 제품의 특성에 따라 사전에 임의로 설정되는 것이 바람직하다.Here, the pressure of the gas line 20 as the reference for opening and closing the needle valve 13 of the actuator and the pressure of the gas line 20 and the injection molding machine barrel 12 as the reference for opening and closing the gas control valve 14. The difference value is preferably set arbitrarily in advance according to the type of resin or the characteristics of the product to be injection molded.

삭제delete

따라서 본 발명은 특정 제품을 성형하고자 하는 수지와 함께 스크류의 회전과 가스라인의 가스를 배럴에 주입함에 따라 변화하는 가스라인과 배럴의 압력변화에 의해 사출 성형기 배럴에 공급되는 가스량을 정확하게 조절함으로써 제품을 사출 성형할 때 주원료로 사용되는 수지의 종류나 제품에 특성에 맞는 제품을 사출 성형할 수 있는 효과가 있다.Therefore, the present invention is to precisely control the amount of gas supplied to the injection molding machine barrel by the pressure of the gas line and the barrel changes as the rotation of the screw and the gas of the gas line into the barrel with the resin to form a specific product When injection molding the product has the effect of injection molding a product that matches the characteristics of the type or resin used as the main raw material.

이상에서 본 발명은 기재된 구체적인 실시예에 대해서만 상세히 설명되었지만 본 발명의 기술사상 범위 내에서 다양한 변형 및 수정이 가능함은 당업자에게 있어서 명백한 것이며, 이러한 변형 및 수정이 첨부된 특허청구범위에 속함은 당연한 것이다.Although the present invention has been described in detail only with respect to the specific embodiments described, it will be apparent to those skilled in the art that various modifications and variations are possible within the technical scope of the present invention, and such modifications and modifications belong to the appended claims. .

Claims (3)

사출 성형기의 가스공급장치의 전원이 “온”되면 액추에이터의 니들밸브를 열어 가스 압축기로부터 공급되는 가스를 가스라인의 압력이 일정압력이 되기까지 주입하는 제1단계;A first step of opening the needle valve of the actuator and injecting the gas supplied from the gas compressor until the pressure in the gas line becomes a constant pressure when the power supply of the gas supply device of the injection molding machine is turned "on"; 상기 가스라인의 압력이 일정압력까지 상승되면 액추에이터의 니들밸브를 닫고 스크류 회전감지센서의 계량 작동신호를 분석하여 스크류가 회전하는지를 확인하는 제2단계;A second step of confirming whether the screw rotates by closing the needle valve of the actuator and analyzing the metering operation signal of the screw rotation sensor when the pressure of the gas line rises to a predetermined pressure; 상기 스크류가 회전되면 스크류의 회전으로 변화하는 가스라인의 압력과 사출 성형기 배럴의 압력을 감지하고, 가스라인과 사출 성형기 배럴의 압력차이가 일정압력까지 근접하는지를 확인하는 제3단계;A third step of detecting the pressure of the gas line and the injection molding machine barrel which are changed by the rotation of the screw when the screw is rotated, and checking whether the pressure difference between the gas line and the injection molding machine barrel is close to a predetermined pressure; 상기 가스라인과 사출 성형기 배럴의 압력차이가 일정압력 이내로 근접하게 되면 가스 콘트롤밸브를 열어 가스라인의 가스를 사출 성형기 배럴에 주입하면서 가스라인과 사출 성형기 배럴의 압력변화를 감시하는 제4단계; 및A fourth step of opening the gas control valve to monitor the pressure change of the gas line and the injection molding machine barrel while injecting the gas of the gas line into the injection molding machine barrel when the pressure difference between the gas line and the injection molding machine barrel approaches within a predetermined pressure; And 상기 제4단계의 감시결과, 가스라인과 사출 성형기 배럴의 압력차이가 일정압력까지 근접하게 되면 가스 콘트롤밸브를 닫고 액추에이터의 니들밸브를 열어 가스 압축기의 가스를 가스라인에 주입하는 제5단계;A fifth step of closing the gas control valve and opening the needle valve of the actuator to inject the gas from the gas compressor into the gas line when the pressure difference between the gas line and the injection molding machine barrel approaches a predetermined pressure as a result of the monitoring of the fourth step; 를 포함하는 것을 특징으로 하는 가스라인과 배럴의 압력변화에 의해 사출 성형기의 배럴에 주입되는 가스량을 조절하는 방법.Method of controlling the amount of gas injected into the barrel of the injection molding machine by the pressure change of the gas line and the barrel comprising a. 제1항에 있어서,The method of claim 1, 상기 액추에이터의 니들밸브를 개폐시키는 기준이 되는 가스라인의 압력과 상기 가스 콘트롤밸브를 개폐시키는 기준이 되는 가스라인과 사출 성형기 배럴의 압력차이값은, 수지의 종류나 사출 성형하고자 하는 제품의 특성에 따라 사전에 임의로 설정되는 것을 특징으로 하는 가스라인과 배럴의 압력변화에 의해 사출 성형기의 배럴에 주입되는 가스량을 조절하는 방법.The pressure difference between the gas line serving as the reference for opening and closing the needle valve of the actuator and the pressure difference between the gas line serving as the reference for opening and closing the gas control valve and the barrel of the injection molding machine is determined by the type of resin and the characteristics of the product to be injection molded. And a gas amount injected into the barrel of the injection molding machine by the pressure change of the gas line and the barrel. 삭제delete
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