JP4294005B2 - Control method of roller head extruder - Google Patents

Control method of roller head extruder Download PDF

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JP4294005B2
JP4294005B2 JP2005134018A JP2005134018A JP4294005B2 JP 4294005 B2 JP4294005 B2 JP 4294005B2 JP 2005134018 A JP2005134018 A JP 2005134018A JP 2005134018 A JP2005134018 A JP 2005134018A JP 4294005 B2 JP4294005 B2 JP 4294005B2
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roller head
bank
pressure
speed
rotation speed
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JP2006305976A (en
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誠 入江
吉身 服部
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Moriyama Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
    • B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
    • B29B7/484—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws with two shafts provided with screws, e.g. one screw being shorter than the other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
    • B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
    • B29B7/488—Parts, e.g. casings, sealings; Accessories, e.g. flow controlling or throttling devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
    • B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
    • B29B7/488—Parts, e.g. casings, sealings; Accessories, e.g. flow controlling or throttling devices
    • B29B7/489—Screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/52—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices with rollers or the like, e.g. calenders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/58—Component parts, details or accessories; Auxiliary operations
    • B29B7/582—Component parts, details or accessories; Auxiliary operations for discharging, e.g. doors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/58—Component parts, details or accessories; Auxiliary operations
    • B29B7/72—Measuring, controlling or regulating
    • B29B7/726—Measuring properties of mixture, e.g. temperature or density
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/52—Screws with an outer diameter varying along the longitudinal axis, e.g. for obtaining different thread clearance
    • B29C48/525—Conical screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92514—Pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/9258—Velocity
    • B29C2948/9259—Angular velocity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92904—Die; Nozzle zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92952—Drive section, e.g. gearbox, motor or drive fluids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Description

本発明は、ローラヘッド押出機の制御方法に関し、特に、バンク内に、押出材料を押し出すテーパースクリューと、前記バンク内に押し出された押出材料を押出成形するローラヘッドとを備えたローラヘッド押出機の制御方法に関するものである。   The present invention relates to a control method for a roller head extruder, and in particular, a roller head extruder provided with a taper screw for extruding an extruded material in a bank and a roller head for extruding the extruded material extruded into the bank. It is related with the control method.

従来、ローラヘッド押出機の制御方法としては、バンク内の圧力を一定に保つように材料押出用スクリューとローラヘッドの回転速度を制御する方法が採用されている（例えば、特許文献１及び２参照）。   Conventionally, as a control method of the roller head extruder, a method of controlling the rotation speed of the material extrusion screw and the roller head so as to keep the pressure in the bank constant (for example, refer to Patent Documents 1 and 2). ).

しかし、この場合、バンク内の圧力変化にともなって、押出用スクリューとローラヘッドの回転速度を変更し、バンク内圧力を一定に保つように制御するものであるが、テーパースクリューとローラヘッドの回転速度が、バンク内圧力変化によって頻繁に変動し、所定のバンク内圧力とすることは困難で、ローラヘッドによって押出成形するシートの形状もエッジ部分に乱れが生じやすいといった問題があった。
特許第２６９８０３７号公報 特公昭５５−４５７５号公報 However, in this case, with the pressure changes in the bank, to change the rotational speed of the extrusion screw and the roller head, but is intended to control to keep the bank pressure constant, the rotation of the taper screw and roller head The speed fluctuates frequently due to changes in bank pressure, making it difficult to achieve a predetermined bank pressure, and the shape of the sheet extruded by the roller head tends to be disturbed at the edge.
Japanese Patent No. 2698037 Japanese Patent Publication No.55-4575

本発明は、上記従来のローラヘッド押出機の制御方法の有する問題点に鑑み、押出成形されるシートのエッジ部分に乱れが生じにくい、ローラヘッド押出機の制御方法を提供することを目的とする。   An object of the present invention is to provide a control method for a roller head extruder in which the edge portion of a sheet to be extruded is less likely to be disturbed in view of the problems of the conventional control method for a roller head extruder. .

上記目的を達成するため、本発明のローラヘッド押出機の制御方法は、バンク内に、押出材料を押し出すテーパースクリューと、前記バンク内に押し出された押出材料を押出成形するローラヘッドとを備えたローラヘッド押出機の制御方法において、予め設定した、ローラヘッド回転速度と、該ローラヘッド回転速度に対するテーパースクリュー回転速度の速度比と、該速度比のときのバンク内圧力を基準にしたバンク内圧力範囲を記憶し、記憶したローラヘッド回転速度と、該ローラヘッド回転速度に対するテーパースクリュー回転速度の比から算出したテーパースクリュー回転速度によって自動運転を開始し、バンク内圧力が、前記バンク内圧力範囲を外れたときに、ローラヘッド回転速度は一定のまま、テーパースクリュー回転速度を変更することによって、前記速度比を変更し、バンク内圧力が、前記バンク内圧力範囲に復帰したとき、当初の速度比に戻して、押出材料を押出成形することを特徴とする。 In order to achieve the above object, a control method for a roller head extruder according to the present invention includes, in a bank, a taper screw for extruding an extruded material, and a roller head for extruding the extruded material extruded in the bank. In the control method of the roller head extruder, the pressure in the bank based on the preset roller head rotation speed, the speed ratio of the taper screw rotation speed to the roller head rotation speed, and the bank internal pressure at the speed ratio. The range is stored, and automatic operation is started by the taper screw rotation speed calculated from the stored roller head rotation speed and the ratio of the taper screw rotation speed to the roller head rotation speed. when off, the roller head rotational speed remains constant, the tapered screw rotation speed By further, by changing the speed ratio, bank pressure, when returning to the bank pressure range, back to the original speed ratio, characterized by extruding the extruded material.

この場合において、予め設定する設定値を、テーパースクリューを回転させて、バンク内に押出材料を押し出し、バンク内圧力がローラヘッド発進設定圧力に到達したとき、ローラヘッドを回転せしめ、押出成形される押出材料のシート形状の良否を判別し、良品が押出成形されたときの、ローラヘッド回転速度と、該ローラヘッド回転速度に対するテーパースクリュー回転速度の速度比と、バンク内圧力と、該バンク内圧力を中心値にした、所定範囲のバンク内圧力範囲とをそれぞれ記憶するティーチング運転によって決定することができる。   In this case, the set value set in advance is rotated by rotating the taper screw to extrude the extruded material into the bank, and when the pressure in the bank reaches the roller head start set pressure, the roller head is rotated and extrusion molding is performed. The quality of the extruded material sheet is determined to be good, and when a good product is extruded, the roller head rotation speed, the speed ratio of the taper screw rotation speed to the roller head rotation speed, the bank pressure, and the bank pressure Can be determined by a teaching operation that stores a predetermined range of in-bank pressure ranges each having a central value.

また、この場合において、バンク内圧力範囲を、最上限圧力、上限圧力、下限圧力、最下限圧力を境界値として区分けし、５段階とすることができる。 In this case, the bank pressure range can be classified into five levels by dividing the maximum upper limit pressure, the upper limit pressure, the lower limit pressure, and the lower limit pressure as boundary values .

本発明のローラヘッド押出機の制御方法によれば、ローラヘッド回転速度と、テーパースクリュー回転速度の速度比を基準に、バンク内の圧力が所定の範囲を逸脱したときのみ速度比を変更し、テーパースクリュー回転速度を変更するようにしたから、テーパースクリューの回転速度が頻繁に変更されることはなく、安定した形状のシートを押出成形することのできるローラヘッド押出機の制御方法を提供することができる。   According to the control method of the roller head extruder of the present invention, the speed ratio is changed only when the pressure in the bank deviates from a predetermined range on the basis of the speed ratio of the roller head rotation speed and the taper screw rotation speed, To provide a method for controlling a roller head extruder capable of extruding a sheet having a stable shape without changing the rotation speed of the taper screw frequently because the rotation speed of the taper screw is changed. Can do.

また、予め設定する設定値を、ティーチング運転によって行うときは、最適形状のシートを押出成形することができるときの、ローラヘッド回転速度と該ローラヘッド回転速度に対するテーパースクリュー回転速度の速度比と、バンク内圧力と、該バンク内圧力を中心値にした、所定範囲のバンク内圧力範囲を得ることができるから、さらに安定した形状のシートを押出成形することのできるローラヘッド押出機の制御方法を提供することができる。   Further, when performing the preset setting value by teaching operation, when the optimally shaped sheet can be extruded, the roller head rotation speed and the speed ratio of the taper screw rotation speed to the roller head rotation speed, A control method for a roller head extruder capable of extruding a sheet having a more stable shape since a bank internal pressure and a bank internal pressure range having a central value of the bank internal pressure can be obtained. Can be provided.

また、バンク内圧力範囲を、最上限圧力、上限圧力、下限圧力、最下限圧力を境界値として区分けし、５段階とするときは、より詳細にローラヘッド回転速度と、テーパースクリュー回転速度の速度比に変更することができる。 In addition, when the pressure range in the bank is divided into the upper limit pressure, the upper limit pressure, the lower limit pressure, and the lower limit pressure as boundary values and is divided into five stages, the roller head rotation speed and the taper screw rotation speed are more detailed. Ratio can be changed.

以下、本発明のローラヘッド押出機の制御方法の実施の形態を、図面に基づいて説明する。   Embodiments of a control method for a roller head extruder according to the present invention will be described below with reference to the drawings.

図１〜図２に、本発明のローラヘッド押出機の制御方法に用いるローラヘッド押出機１の実施例を示す。
まず、本発明の制御方法を用いるローラヘッド押出機１は、上部に押出材料の供給口２ａを開口した筐体２と、該筐体２内に、駆動機構Ｍ１によって回動自在に配設した対となるテーパースクリュー３、３と、筐体２に開口した、テーパースクリュー３、３から押し出される押出材料の出口２ｂと、該出口２ｂから押し出された押出材料を、シート状に成形するための、上下に対となり、駆動機構Ｍ２によって回動自在に配設したローラヘッド４、４とからなる。そして、出口２ｂからローラヘッド４、４までの間で形成するバンク５は、いわゆるクローズド形式に形成する。圧力検出器６は、バンク５内の圧力を測定するものである。
そして、このローラヘッド押出機１は、制御機構１０によって、その運転が制御されるものである。 1 to 2 show an embodiment of a roller head extruder 1 used in the method for controlling a roller head extruder according to the present invention.
First, a roller head extruder 1 using the control method of the present invention is provided with a casing 2 having an extrusion material supply port 2a opened at an upper portion thereof, and is rotatably disposed in the casing 2 by a drive mechanism M1. A pair of taper screws 3 and 3, an extrusion material outlet 2 b extruded from the taper screws 3 and 3 opened in the housing 2, and an extrusion material extruded from the outlet 2 b are formed into a sheet shape. The roller heads 4 and 4 are paired up and down and rotatably arranged by the drive mechanism M2. The bank 5 formed between the outlet 2b and the roller heads 4 and 4 is formed in a so-called closed type. The pressure detector 6 measures the pressure in the bank 5.
The operation of the roller head extruder 1 is controlled by the control mechanism 10.

このローラヘッド押出機１の制御方法は、図３及び図４のフロー図に示す手順で行われるもので、まず、制御機構１０の記憶手段１１に、ローラヘッド４の回転速度（自動ローラヘッド回転速度）と、該ローラヘッド４の回転速度に対するテーパースクリュー３の回転速度の速度比と、該速度比のときのバンク５内の圧力を基準にしたバンク内圧力範囲とをそれぞれ記憶するためのティーチング運転Ｔを行う。ローラヘッド４の回転速度は、成形するシート材料の時間当たりの量となるため、通常、成形加工中は変更することは少ない。   The control method of the roller head extruder 1 is performed according to the procedure shown in the flow charts of FIGS. 3 and 4. First, the rotation speed of the roller head 4 (automatic roller head rotation) Speed), a speed ratio of the rotational speed of the taper screw 3 to the rotational speed of the roller head 4, and a pressure range in the bank based on the pressure in the bank 5 at the speed ratio. Run T. Since the rotational speed of the roller head 4 is an amount per hour of the sheet material to be molded, it is usually not changed during the molding process.

図３に、ティーチング運転Ｔのフロー図を示す。
このティーチング運転Ｔは、同一の材料を同一の条件で押出成形する際には必要がなく、図４に示す自動運転Ａのフロー図のティーチングデータ読出のところで必要なデータを読み出すことによってティーチング運転Ｔを省略することができる。 FIG. 3 shows a flowchart of the teaching operation T.
This teaching operation T is not necessary when extruding the same material under the same conditions. The teaching operation T is performed by reading out necessary data at the reading of teaching data in the flow chart of the automatic operation A shown in FIG. Can be omitted.

ティーチング運転Ｔは、まず、テーパースクリュー３、３を、生産性を向上させるために高速で回転を開始すると、バンク５内に押出材料が充填し始める。
バンク５内の圧力が、自動テーパースクリュー発進圧力に到達したとき、テーパースクリュー３、３の回転速度を、自動テーパースクリュー発進速度に切り換える。自動テーパースクリュー発進圧力と、自動テーパースクリュー発進速度は、押出材料によって異なるものであるが、通常は、例えば、５０ｋＰａ、３ｒｐｍ等に設定する。 In the teaching operation T, first, when the taper screws 3 and 3 are started to rotate at a high speed in order to improve productivity, the bank 5 starts to be filled with the extruded material.
When the pressure in the bank 5 reaches the automatic taper screw start pressure, the rotational speed of the taper screws 3 and 3 is switched to the automatic taper screw start speed. The automatic taper screw starting pressure and the automatic taper screw starting speed differ depending on the extruded material, but are usually set to, for example, 50 kPa, 3 rpm, or the like.

自動テーパースクリュー発進速度によって、押出材料が、バンク５内にさらに充填され、バンク５内の圧力が上昇する。バンク５内の圧力が、所定（例えば、３５０ｋＰａ）の自動ローラヘッド発進圧力に到達したとき、ローラヘッド４、４を、例えば、３ｍ／ｍｉｎの所定の自動ローラヘッド発進速度で回転させる。そして、ローラヘッド４の速度が、自動ローラヘッド発進速度に切り替わったとき、テーパースクリュー３、３の速度を、ローラヘッド４の自動ローラヘッド発進速度に対する一定の比率（以下、「速度比」という。）による速度に変更して運転する。   Due to the automatic taper screw start speed, the extruded material is further filled into the bank 5 and the pressure in the bank 5 is increased. When the pressure in the bank 5 reaches a predetermined (for example, 350 kPa) automatic roller head start pressure, the roller heads 4 and 4 are rotated at a predetermined automatic roller head start speed of, for example, 3 m / min. When the speed of the roller head 4 is switched to the automatic roller head start speed, the speed of the taper screws 3 and 3 is referred to as a constant ratio (hereinafter referred to as “speed ratio”) with respect to the automatic roller head start speed of the roller head 4. ) Change the speed to

この速度比は、速度比が１００％というときは、ローラヘッド４の最高回転速度に対する、自動ローラヘッド発進速度の割合がＡ％のとき、テーパースクリュー３の最高速度に対しても、テーパースクリュー３の速度をＡ％とすることを意味し、速度比が２５０％の場合は、テーパースクリュー３の最高速度に対して（Ａ×２．５）％の速度とすることを意味する。
従って、速度比が１００％のとき、ローラヘッド４の最高回転速度が１０ｍ／ｍｉｎの場合に、自動ローラヘッド発進速度が３ｍ／ｍｉｎであれば、自動ローラヘッド発進速度は、ローラヘッド４の最高回転速度の３０％となり、テーパースクリュー３の最高速度が２０ｒｐｍとすると、テーパースクリュー３の速度は、２０ｒｐｍ×０．３＝６ｒｐｍとなる。 When the speed ratio is 100%, the ratio of the automatic roller head start speed to the maximum rotation speed of the roller head 4 is A%. This means that the speed of A is set to A%, and when the speed ratio is 250%, it means that the speed is (A × 2.5)% with respect to the maximum speed of the taper screw 3.
Therefore, when the speed ratio is 100% and the maximum rotation speed of the roller head 4 is 10 m / min, and the automatic roller head start speed is 3 m / min, the automatic roller head start speed is the maximum of the roller head 4 When the rotation speed is 30% and the maximum speed of the taper screw 3 is 20 rpm, the speed of the taper screw 3 is 20 rpm × 0.3 = 6 rpm.

そして、この自動ローラヘッド発進速度と、自動ローラヘッド発進速度との速度比によって決定されたテーパースクリュー３の速度で運転を行い、ローラヘッド４の速度とテーパースクリュー３の速度を、アナログジョイスティックなどの微調整機器で調整しながら、目視又は形状センサ等で、押出成形されるシートの形状（特に、エッジ部分の形状）を判別し、シート形状が最適となったときの、自動ローラヘッド発進速度、速度比、及びバンク５内の圧力をバンク内基準圧力としてそれぞれ記憶する。   Then, operation is performed at a speed of the taper screw 3 determined by a speed ratio between the automatic roller head start speed and the automatic roller head start speed, and the speed of the roller head 4 and the speed of the taper screw 3 are changed to an analog joystick or the like. While adjusting with a fine adjustment device, the shape of the sheet to be extruded (particularly the shape of the edge portion) is determined visually or with a shape sensor, etc., and the automatic roller head start speed when the sheet shape is optimal, The speed ratio and the pressure in the bank 5 are stored as the bank reference pressure.

記憶するバンク５内の圧力（バンク内基準圧力）は、シート形状が最適となったときの、自動ローラヘッド発進速度と、自動ローラヘッド発進速度とフィーダ速度の、速度比の基準値で、自動運転の際には、この基準圧力を中心値に、バンク圧力区分として、最上限値、上限値、下限値、最下限値を境界値として区分けし、５段階とすることが好ましい。
この圧力区分は、所定のバンク内圧力区分比を、基準圧力に対して一定の比率を乗じて決定し、以下の式で表される。
最上限値＝基準圧力×（１＋２×バンク内圧力区分比）
上限値＝基準圧力×（１＋バンク内圧力区分比）
下限値＝基準圧力×（１−バンク内圧力区分比）
最下限値＝基準圧力×（１−２×バンク内圧力区分比）
このバンク内圧力区分比は、発明者らの実験によると、０．２（２０％）前後の値が最適値で、従って、基準圧力が５００ｋＰａのとき、バンク内圧力区分比を０．２（２０％）として計算すると、最上限値、上限値、下限値、最下限値は、それぞれ、７００、６００、４００、３００ｋＰａとなり、これらの値を、制御機構１０の記憶手段１１に、自動ローラヘッド発進速度、速度比とともに記憶し、ティーチング運転Ｔを終了する。 The pressure in the bank 5 (reference pressure in the bank) to be stored is the reference value of the speed ratio between the automatic roller head start speed and the automatic roller head start speed and feeder speed when the sheet shape is optimal. At the time of operation, it is preferable to classify the reference pressure as the central value and the bank pressure classification into the maximum upper limit value, the upper limit value, the lower limit value, and the lower limit value as the boundary value, and to make five stages.
This pressure category is determined by multiplying a predetermined bank pressure category ratio by a certain ratio with respect to the reference pressure, and is expressed by the following equation.
Maximum value = Reference pressure x (1 + 2 x Bank pressure division ratio)
Upper limit value = Reference pressure x (1 + Bank pressure division ratio)
Lower limit = reference pressure x (1-bank pressure division ratio)
Lower limit = reference pressure x (1-2 x pressure division ratio in bank)
According to the experiments conducted by the inventors, the bank pressure division ratio is an optimum value around 0.2 (20%). Therefore, when the reference pressure is 500 kPa, the bank pressure division ratio is 0.2 ( 20%), the maximum upper limit value, the upper limit value, the lower limit value, and the lower limit value are 700, 600, 400, and 300 kPa, respectively, and these values are stored in the storage unit 11 of the control mechanism 10 and the automatic roller head. The starting speed and speed ratio are stored together and the teaching operation T is completed.

次に、自動運転Ａは、ティーチング運転Ｔによって記憶したデータを読み出して押出材料の押出成形を行うものである。なお、自動運転Ａは、ティーチング運転Ｔに引き続き行うことももちろん可能である。
図４に、自動運転Ａのフロー図を示す。
この自動運転Ａは、ティーチング運転Ｔによって記憶したデータを記憶手段１１より読み出して開始する。そして、ティーチング運転Ｔと同様、バンク５内の圧力が、バンク内基準圧力に到達するまでは、テーパースクリュー３、３を高速度で回転を開始し、バンク５内に押出材料を充填し始める。バンク５内の圧力が、自動テーパースクリュー発進圧力に到達したとき、テーパースクリュー３、３の回転速度を、自動テーパースクリュー発進速度に切り換え、さらにバンク５内の圧力が上昇し、自動ローラヘッド発進圧力に到達したとき、記憶した自動ローラヘッド発進速度でローラヘッド４、４の回転を開始し、フィーダ速度を、記憶手段１１によって記憶された速度比によって決定されるフィーダ速度に変更し、自動運転を開始する。
そして、フロー図に示すとおり、バンク５内の圧力が、記憶手段１１に記憶された上限値と下限値の間（以下、「適正圧力」という。）にあるときは、前記フィーダ速度で押出成形を続行し、適正圧力を外れたとき、フィーダ速度を変更する。
バンク５内の圧力が、上限値、下限値を超えたときは、それぞれフィーダ速度を予め設定しておいた低速・高速に、最上限値を超えたときは、フィーダ速度を０に、反対に最下限値を超えたときは、フィーダ速度を最速に変更する。
予め設定しておいたフィーダ速度の、低速・高速は、速度比によって決定されるフィーダ速度の前後の固定値であっても、速度比を基準に制御機構１０によって算出された値であってもよい。 Next, in the automatic operation A, the data stored in the teaching operation T is read and the extrusion material is extruded. Of course, the automatic operation A can be performed after the teaching operation T.
FIG. 4 shows a flowchart of the automatic operation A.
This automatic operation A starts by reading the data stored in the teaching operation T from the storage means 11. Then, as in the teaching operation T, until the pressure in the bank 5 reaches the reference pressure in the bank, the taper screws 3 and 3 are started to rotate at a high speed, and the bank 5 starts to be filled with the extruded material. When the pressure in the bank 5 reaches the automatic taper screw starting pressure, the rotational speed of the taper screws 3 and 3 is switched to the automatic taper screw starting speed, and the pressure in the bank 5 is further increased to increase the automatic roller head starting pressure. , The rotation of the roller heads 4 and 4 is started at the stored automatic roller head start speed, the feeder speed is changed to the feeder speed determined by the speed ratio stored by the storage means 11, and the automatic operation is performed. Start.
As shown in the flowchart, when the pressure in the bank 5 is between the upper limit value and the lower limit value stored in the storage means 11 (hereinafter referred to as “appropriate pressure”), extrusion molding is performed at the feeder speed. Continue to change the feeder speed when the proper pressure is released.
When the pressure in the bank 5 exceeds the upper limit and lower limit, the feeder speed is set to the low speed / high speed, respectively. When the pressure exceeds the maximum upper limit, the feeder speed is set to 0 and vice versa. When the lower limit is exceeded, the feeder speed is changed to the highest speed.
The preset feeder speeds of low speed and high speed may be fixed values before and after the feeder speed determined by the speed ratio, or may be values calculated by the control mechanism 10 based on the speed ratio. Good.

本発明のローラヘッド押出機の制御方法は、ローラヘッド速度と、フィーダ速度の速度比を基準にしてバンク内圧力が大幅に変動しない限り速度比を守り、適正圧力の範囲を逸脱したときにのみローラヘッド速度は一定のまま、フィーダ速度のみ変更する方法を採用して押出成形を行った結果、バンク内圧力の変動によって逐一フィーダ速度とローラヘッド速度を変更する、従来のローラヘッド押出機の制御方法に比べて、成形されるシートの形状を、格段に安定させることができた。   The control method of the roller head extruder of the present invention is based on the ratio of the roller head speed and the speed of the feeder. Control of a conventional roller head extruder that changes the feeder speed and roller head speed one by one due to fluctuations in the pressure in the bank as a result of extrusion using a method that changes only the feeder speed while the roller head speed remains constant Compared with the method, the shape of the formed sheet could be remarkably stabilized.

以上、本発明のローラヘッド押出機の制御方法について、その実施例に基づいて説明したが、本発明は上記実施例に記載した構成に限定されるものではなく、その趣旨を逸脱しない範囲において適宜その構成を変更することができるものである。   As mentioned above, although the control method of the roller head extruder of this invention was demonstrated based on the Example, this invention is not limited to the structure described in the said Example, In the range which does not deviate from the meaning, it is appropriate. The configuration can be changed.

本発明のローラヘッド押出機の制御方法は、ローラヘッド速度と、フィーダ速度の速度比を基準にして適正圧力の範囲にある限り速度比を守って制御することによって、安定した形状のシートを押出成形することができるという特性を有していることから、新規のローラヘッド押出機の制御方法に用いることができるほか、既設のローラヘッド押出機の制御方法に、制御機構を入れ替えることによって適用する用途にも用いることができる。   According to the control method of the roller head extruder of the present invention, a sheet having a stable shape is extruded by controlling the speed ratio as long as it is within a proper pressure range based on the speed ratio between the roller head speed and the feeder speed. Since it has the property that it can be molded, it can be used for a control method of a new roller head extruder, and is applied by replacing the control mechanism with the control method of an existing roller head extruder. It can also be used for applications.

本発明の制御方法に用いるローラヘッド押出機の一部切り欠きの平面図である。It is a top view of a part notch of the roller head extruder used for the control method of the present invention. 同側面図である。It is the same side view. 本発明のローラヘッド押出機の制御方法のティーチング運転のフロー図である。It is a flowchart of the teaching driving | operation of the control method of the roller head extruder of this invention. 本発明のローラヘッド押出機の制御方法の自動運転のフロー図である。It is a flowchart of the automatic driving | operation of the control method of the roller head extruder of this invention.

１ ローラヘッド押出機
３ テーパースクリュー
４ ローラヘッド
５ バンク
１０ 制御機構
１１ 記憶手段
Ｔ ティーチング運転 DESCRIPTION OF SYMBOLS 1 Roller head extruder 3 Tapered screw 4 Roller head 5 Bank 10 Control mechanism 11 Memory | storage means T Teaching operation

Claims (3)

バンク内に、押出材料を押し出すテーパースクリューと、前記バンク内に押し出された押出材料を押出成形するローラヘッドとを備えたローラヘッド押出機の制御方法において、予め設定した、ローラヘッド回転速度と、該ローラヘッド回転速度に対するテーパースクリュー回転速度の速度比と、該速度比のときのバンク内圧力を基準にしたバンク内圧力範囲を記憶し、記憶したローラヘッド回転速度と、該ローラヘッド回転速度に対するテーパースクリュー回転速度の比から算出したテーパースクリュー回転速度によって自動運転を開始し、バンク内圧力が、前記バンク内圧力範囲を外れたときに、ローラヘッド回転速度は一定のまま、テーパースクリュー回転速度を変更することによって、前記速度比を変更し、バンク内圧力が、前記バンク内圧力範囲に復帰したとき、当初の速度比に戻して、押出材料を押出成形することを特徴とするローラヘッド押出機の制御方法。 In the control method of the roller head extruder provided with a taper screw for extruding the extruded material in the bank and a roller head for extruding the extruded material extruded into the bank, a roller head rotation speed set in advance, A speed ratio of the taper screw rotation speed to the roller head rotation speed and a bank pressure range based on the bank pressure at the speed ratio are stored, and the stored roller head rotation speed and the roller head rotation speed are stored. When the automatic operation is started with the taper screw rotation speed calculated from the ratio of the taper screw rotation speed, and the pressure in the bank is out of the pressure range in the bank , the roller head rotation speed remains constant and the taper screw rotation speed is adjusted. by changing, and changing the speed ratio, bank pressure, wherein the bar When returning to click within the pressure range, back to the original speed ratio control method for a roller head extruder, which comprises extruding an extrusion material. 予め設定する設定値を、テーパースクリューを回転させて、バンク内に押出材料を押し出し、バンク内圧力がローラヘッド発進設定圧力に到達したとき、ローラヘッドを回転せしめ、押出成形される押出材料のシート形状の良否を判別し、良品が押出成形されたときの、ローラヘッド回転速度と、該ローラヘッド回転速度に対するテーパースクリュー回転速度の速度比と、バンク内圧力と、該バンク内圧力を中心値にした、所定範囲のバンク内圧力範囲とをそれぞれ記憶するティーチング運転によって決定することを特徴とする請求項１記載のローラヘッド押出機の制御方法。   Set the preset value by rotating the taper screw to extrude the extruded material into the bank, and when the bank pressure reaches the roller head start set pressure, the roller head is rotated and the extruded material sheet is extruded. Determine the quality of the shape, when the non-defective product is extruded, the roller head rotation speed, the speed ratio of the taper screw rotation speed to the roller head rotation speed, the bank internal pressure, and the bank internal pressure 2. The method of controlling a roller head extruder according to claim 1, wherein the control is determined by a teaching operation that stores a predetermined range of the in-bank pressure range. バンク内圧力範囲を、最上限圧力、上限圧力、下限圧力、最下限圧力を境界値として区分けし、５段階としたことを特徴とする請求項１又は２記載のローラヘッド押出機の制御方法。 3. The method of controlling a roller head extruder according to claim 1, wherein the pressure range in the bank is classified into five stages by dividing the maximum upper limit pressure, the upper limit pressure, the lower limit pressure, and the lower limit pressure as boundary values .
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