JPH08142160A - Measurement of abrasion degree of inner surface of barrel of extruder - Google Patents
Measurement of abrasion degree of inner surface of barrel of extruderInfo
- Publication number
- JPH08142160A JPH08142160A JP6284936A JP28493694A JPH08142160A JP H08142160 A JPH08142160 A JP H08142160A JP 6284936 A JP6284936 A JP 6284936A JP 28493694 A JP28493694 A JP 28493694A JP H08142160 A JPH08142160 A JP H08142160A
- Authority
- JP
- Japan
- Prior art keywords
- barrel
- extruder
- measurement
- measuring
- measured
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- 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
- B29C2948/92009—Measured parameter
- B29C2948/92114—Dimensions
- B29C2948/92152—Thickness
-
- 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
- B29C2948/92323—Location or phase of measurement
- B29C2948/92361—Extrusion unit
- B29C2948/9238—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/924—Barrel or housing
-
- 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
- B29C2948/92609—Dimensions
- B29C2948/92647—Thickness
-
- 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
- B29C2948/92809—Particular value claimed
-
- 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
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92895—Barrel or housing
-
- 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
- B29C2948/9298—Start-up, shut-down or parameter setting phase; Emergency shut-down; Material change; Test or laboratory equipment or studies
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、押出機バレルの内面
が、スクリューとの摩擦等により磨耗した場合の、磨耗
度測定方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the degree of wear when the inner surface of an extruder barrel is worn by friction with a screw or the like.
【0002】[0002]
【従来の技術】押出機は、バレル内に僅かのクリアラン
スを保持して配設したスクリューの回転により、合成樹
脂等の成形材料を溶融・混練して高圧状態で押出すた
め、バレルの内面が、主としてスクリューとの摩擦によ
り磨耗し易く、この磨耗のために上記クリアランスが大
きくなると、溶融樹脂のバックフローが発生し、押出し
変動、材料停滞のための熱分解等を起こして、製品品質
の低下を招くという問題があった。2. Description of the Related Art An extruder melts and kneads a molding material such as a synthetic resin and extrudes it under a high pressure by rotating a screw arranged with a slight clearance in the barrel. , It is easy to wear due to friction with the screw, and if this clearance increases due to this wear, back flow of the molten resin occurs, causing extrusion fluctuation, thermal decomposition due to material stagnation, etc. There was a problem of inviting.
【0003】そこで、押出機バレルの内面は、頻繁にそ
の磨耗度を測定する必要があり、その測定方法として、
従来は押出機を停止してバレルとスクリューとを切離
し、バレル内面の樹脂その他の付着物を除去した後、棒
状の所謂“単体形マイクロメータ”を用いて、バレルの
通孔の直径を人手により測定する方法を採っていた。Therefore, it is necessary to frequently measure the degree of wear of the inner surface of the extruder barrel.
Conventionally, the extruder was stopped, the barrel and the screw were separated, the resin and other deposits on the inner surface of the barrel were removed, and then the diameter of the through hole of the barrel was manually The measurement method was adopted.
【0004】[0004]
【発明が解決しようとする課題】ところが、押出機のバ
レルは、例えば2軸押出機の場合、その長さが2m程度
あり、内部の通孔は、100mm径程度の丸孔が図3に
示すように二つ、一部が重なったような状態で貫設され
ており、長手方向中央部になる程測定作業が煩わしく、
測定不能箇所があったり、或いは測定できたとしても、
その測定値に個人差が出ることもあって、正確に測定す
ることが出来なかった。However, in the case of a twin-screw extruder, for example, the barrel of the extruder has a length of about 2 m, and the internal through hole is a round hole with a diameter of about 100 mm as shown in FIG. As shown in the figure, the two are partly overlapped with each other, and the measurement work becomes more troublesome as it goes to the central part in the longitudinal direction.
Even if there is a point that cannot be measured or if it can be measured,
It was not possible to measure accurately because the measured value may vary from person to person.
【0005】また、定期的に測定するにしても、上述の
通り、その都度機械を停止し且つ分解掃除をしてからで
ないと実施できないという問題もあった。その結果、バ
レル更新等の時期を逸し、製品不良率が大きくなるとい
う問題があった。また更に、測定する為の工数は、分解
掃除に要する工数を含めて2人掛かりで約7時間を要し
ていた。その結果、機械稼働率が低下してこの面からも
生産コストの上昇を招くという問題があった。Further, even if the measurement is carried out periodically, there is a problem that the machine cannot be carried out unless the machine is stopped and disassembled and cleaned as described above. As a result, there has been a problem that the product defect rate increases due to missed times such as barrel renewal. Furthermore, the number of man-hours required for measurement, including the man-hours required for disassembly and cleaning, required about 2 hours for about 7 hours. As a result, there has been a problem that the machine operating rate is lowered and the production cost is increased in this respect as well.
【0006】本発明は、上記従来技術の欠点を解消し、
簡単な方法で正確な測定結果が得られ、しかもタイムリ
ーなバレルの保守管理が可能であって、生産コストの低
減、製品品質の向上を図り得る押出機バレル内面の磨耗
度測定方法を提供することを目的とする。The present invention solves the above-mentioned drawbacks of the prior art,
Provide a method for measuring the degree of abrasion of the inner surface of an extruder barrel that can obtain accurate measurement results by a simple method, yet enable timely maintenance and management of the barrel, reduce production costs, and improve product quality. The purpose is to
【0007】[0007]
【課題を解決するための手段】本発明の押出機バレル内
面の磨耗度測定方法は、「押出機バレルの外面に超音波
厚み計の探触子を当接し得る測定部を形成し、この測定
部に測定点を設定し、バレルの非磨耗時と稼働開始後の
任意の時点での、測定点におけるバレルの肉厚を超音波
厚み計により計測し、非磨耗時の測定値と稼働開始後の
それとの偏差を求めること」を特徴とするものであり、
このことにより上記目的が達成される。The method of measuring the degree of wear of the inner surface of an extruder barrel according to the present invention is described in the following: "A measuring portion capable of contacting a probe of an ultrasonic thickness gauge is formed on the outer surface of the extruder barrel, and this measurement is performed. By setting a measurement point on the section, the thickness of the barrel at the measurement point at the time of non-wear of the barrel and at any time after the start of operation is measured with an ultrasonic thickness gauge, and the measured value at the time of non-wear and after the start of operation Is to obtain the deviation from that of
This achieves the above object.
【0008】本発明者は種々研究の結果、押出機バレル
内面の磨耗度を測定するにあたり、押出機の稼働中でも
可能な方法としては、所謂非破壊検査に類似するような
手段を採らないと不可能なことに着眼し、エックス線、
レーザー光線、超音波等、更にはこれらを応用したCT
( computed tomography )等の技術的手段を試みた。そ
の結果、製造現場において、安全にして且つ経済的であ
り、操作が簡単で正確な測定結果が得られる方法とし
て、超音波を利用することが最適であることを見出した
のである。As a result of various studies, the inventor of the present invention has to take a measure similar to so-called nondestructive inspection as a possible method for measuring the wear degree of the inner surface of the extruder barrel even while the extruder is in operation. Focusing on what is possible, X-ray,
Laser beam, ultrasonic wave, etc., and CT using these
(Computed tomography) and other technical means were tried. As a result, they have found that the use of ultrasonic waves is optimal as a method that is safe and economical in a manufacturing site, is easy to operate, and provides accurate measurement results.
【0009】ところで、バレル内面の磨耗といっても、
通常その内面が均等に磨耗することは少なく、図3に示
すように、2軸スクリュー押出機のバレルBには、前述
の通り丸孔a1、a2が二つ、一部が重なった形の通孔
が形成されている。2軸スクリュー(図示しない)がそ
れぞれ外回りに回転すると、フライト部が互いに噛み合
う部分での溶融材料の圧力により、両スクリューの軸芯
b1、b2が、仰角θ=30°程度の斜め外方に向けて
極く僅かに偏心し、そのフライト部の頂面を、バレルB
の内面c1、c2に強く押し付ける為、部分的な磨耗が
起こるのである。By the way, even if the inner surface of the barrel is worn,
Normally, the inner surface of the twin-screw extruder rarely wears uniformly, and as shown in FIG. 3, the barrel B of the twin-screw extruder has two round holes a1 and a2 as described above, and a part of the round holes a1 and a2 overlap. A hole is formed. When the biaxial screws (not shown) each rotate outward, the pressures of the molten material at the portions where the flight parts mesh with each other cause the axial centers b1 and b2 of both screws to be directed obliquely outward at an elevation angle θ of about 30 °. Is slightly eccentric, and the top surface of the flight part is barrel B
Since the inner surfaces c1 and c2 are strongly pressed against each other, partial wear occurs.
【0010】従って、バレル内面c1、c2の磨耗度を
測定するには、バレル内面の全てにわたって測定する必
要はなく、図3で示す例で言えば、内面c1、c2と仰
角30°の傾斜面F1、F2との交点p1、p2を中心
としてその左右近辺を重点的に測定すれば充分であり、
従来この重点的な測定法により測定され、評価されてき
たのである。Therefore, in order to measure the degree of wear of the barrel inner surfaces c1 and c2, it is not necessary to measure the entire inner surface of the barrel. In the example shown in FIG. 3, the inner surfaces c1 and c2 and the inclined surface having an elevation angle of 30 ° are used. It suffices to focus on the left and right sides of the intersections p1 and p2 with F1 and F2 as the center,
Conventionally, it has been measured and evaluated by this intensive measurement method.
【0011】本発明の超音波厚み計を用いる方法でも、
測定箇所としてはこの方法を踏襲すればよく、本発明で
いう測定部は、このようなことを考慮して、バレルの外
面から、そのバレルの磨耗し易い部分の測定が可能な場
所を、複数カ所選定して設けるのである。In the method using the ultrasonic thickness gauge of the present invention,
As the measurement point, this method may be followed, and in consideration of such a fact, the measurement section in the present invention is, from the outer surface of the barrel, a plurality of places where the wear-prone portion of the barrel can be measured, It is selected and set up in one place.
【0012】ところで、本発明者は、超音波厚み計を用
いる手段として、当初、図3に示すように、バレル内面
c1の場合、測定しようとする箇所から、スクリュー軸
芯b1に達する最短距離を結ぶ線を軸芯とする細い雌螺
子孔d1を設け、これに探触子f1の先端部と同径の雄
螺子を有するピンe1をねじ込み、その頭に探触子f1
を当接して測定する方法を試みた。[0012] By the way, as a means of using an ultrasonic thickness gauge, the present inventor initially, as shown in FIG. 3, in the case of the barrel inner surface c1, determines the shortest distance from the point to be measured to reach the screw axis b1. A thin female screw hole d1 having a connecting line as an axis is provided, and a pin e1 having a male screw having the same diameter as the tip portion of the probe f1 is screwed into the hole, and the probe f1 is attached to its head.
The method of contacting and measuring was attempted.
【0013】この方法では、測定点が固定化できで便利
であり、測定値としてはかなり正確なものが得られた
が、機械稼働中に雌螺子孔d1とピンe1との間に樹脂
が食い込み且つ滞留して熱分解することが判り、この方
法では、機械稼働中に測定できないことが判った。そこ
で、バレルBの外面に測定部を形成しこの測定部に、直
接探触子を当接して測定するという本発明測定方法を編
み出したのである。This method is convenient because the measuring points can be fixed and the measured values are fairly accurate, but the resin bites between the female screw hole d1 and the pin e1 during operation of the machine. In addition, it was found that they stayed and thermally decomposed, and it was found that this method could not be measured during the operation of the machine. Therefore, the measuring method of the present invention was devised, in which a measuring portion was formed on the outer surface of the barrel B and the probe was directly brought into contact with the measuring portion to perform measurement.
【0014】本発明で使用する超音波厚み計は、市販の
ものを用いることにより充分その目的が達成できる。超
音波厚み計は、通常、少なくとも、送信部と受信部とを
組み込んだ探触子と、表示部とを有し、表示部では受信
部からのデータを変換して測定結果を即時に表示するこ
とができる。また、バレル内面での異物の付着有無に関
係なくバレルの肉厚のみを測定することができ、無論、
バレルの長さに関係なくその深部を測定でき、その測定
値に個人差が出ない。The ultrasonic thickness meter used in the present invention can achieve its purpose sufficiently by using a commercially available one. An ultrasonic thickness gauge usually has at least a probe incorporating a transmitter and a receiver, and a display, and the display converts the data from the receiver to immediately display the measurement result. be able to. Moreover, it is possible to measure only the wall thickness of the barrel regardless of the presence or absence of foreign matter on the inner surface of the barrel.
The depth can be measured regardless of the length of the barrel, and there is no individual difference in the measured value.
【0015】従って、そのバレルの非磨耗時、即ち新品
のときの肉厚を予め測定しておけば、稼働開始後の任意
の時点での測定値との偏差を求めことにより、その時点
での磨耗度を測定することができる。また、超音波厚み
計の大きさは、探触子の長さが10mm程度であり、表
示部も手のひらの大きさであるから、取扱性に優れてい
る。また、測定精度は、通常厚さ50.00mmに対し
て±0.03mm程度である。また、測定に要する工数
は、測定点1ヵ所につき1〜2分であり、多数の測定箇
所があったとしても、測定者1人で充分である。Therefore, if the thickness of the barrel when it is not worn, that is, when the barrel is new, is measured in advance, the deviation from the measured value at any time after the start of operation is determined, and the difference at that time is calculated. The degree of wear can be measured. Further, the size of the ultrasonic thickness gauge is excellent in handleability because the length of the probe is about 10 mm and the display unit is also the size of the palm. The measurement accuracy is usually about ± 0.03 mm for a thickness of 50.00 mm. Further, the number of man-hours required for measurement is 1 to 2 minutes for each measurement point, and even if there are many measurement points, one measurer is sufficient.
【0016】本発明での測定部は、測定点に探触子のほ
ぼ中心が適正に当接でき、探触子から受発信するパルス
が、測定を必要とするバレルの肉厚を正確に測定できる
ように形成しておく必要がある。その為に、先ず実際の
バレル外面上、或いは図面上で測定部の位置設定を行
い、然る後バレル外面を加工するのである。In the measuring unit according to the present invention, the center of the probe can be properly brought into contact with the measurement point, and the pulse transmitted and received from the probe accurately measures the wall thickness of the barrel which needs to be measured. It must be formed so that it can be formed. Therefore, the position of the measuring portion is first set on the actual outer surface of the barrel or on the drawing, and then the outer surface of the barrel is machined.
【0017】バレルの肉厚とは、測定すべき箇所からバ
レル内面までの最短距離であるから、例えば、探触子の
先端面の形状が平面の場合、通常の押出機バレルの外周
面は曲面であるからこのままで探触子を当てると、先端
面の接する角度がその都度変わってパルスの反射点が特
定されない。Since the wall thickness of the barrel is the shortest distance from the position to be measured to the inner surface of the barrel, for example, when the shape of the tip surface of the probe is flat, the outer peripheral surface of a normal extruder barrel is a curved surface. Therefore, if the probe is applied as it is, the contact angle of the tip surface changes each time, and the reflection point of the pulse cannot be specified.
【0018】そこで、探触子の先端面より極く僅かに大
きい面積を有し、その中に測定点を含むと共に該測定点
からバレル内面までの最短距離となる直線に対して垂直
に交差する小平面を、切削により形成しておくのであ
る。この小平面が本発明でいう測定部である。この場合
測定部のほぼ中心に測定点が位置するように形成する。
また、この測定部に測定点をマーキングしておくのが好
ましい。Therefore, the probe has an area slightly larger than the tip surface of the probe, includes a measurement point therein, and intersects perpendicularly to a straight line which is the shortest distance from the measurement point to the inner surface of the barrel. The small plane is formed by cutting. This small plane is the measuring unit in the present invention. In this case, the measurement point is formed so as to be located substantially at the center of the measurement section.
In addition, it is preferable to mark a measuring point on this measuring portion.
【0019】なお、超音波厚み計では、夏、冬の温度差
によるパルスの速度に僅かの差があり、環境温度として
は、夏場を40℃、冬場を5℃とすると、温度差は35
℃あることになる。そこで、使用する超音波厚み計につ
いての、環境温度毎の調整値を予め測定しておき、測定
前に環境温度を測定して、その温度における零点補正を
行うのがよい。尚、夏、冬の温度差によるバレルの熱膨
張率については、1/100mm程度であるから測定誤
差範囲であり無視できる。In the ultrasonic thickness gauge, there is a slight difference in pulse speed due to the temperature difference between summer and winter, and the environmental temperature is 40 ° C. in summer and 5 ° C. in winter.
It will be ℃. Therefore, it is preferable that the adjustment value for each environmental temperature of the ultrasonic thickness gauge to be used is measured in advance, the environmental temperature is measured before the measurement, and the zero point is corrected at that temperature. The coefficient of thermal expansion of the barrel due to the temperature difference between summer and winter is about 1/100 mm, which is a measurement error range and can be ignored.
【0020】[0020]
【作用】本発明の押出機バレル内面の磨耗度測定方法
は、押出機バレルの外面に超音波厚み計の探触子を当接
し得る測定部を形成し、この測定部に測定点を設定した
から、該設定された測定点に探触子を適正に当接するこ
とができる。また、このようにして超音波厚み計を利用
した測定方法を採ったので、測定操作が簡単で正確であ
る。According to the method of measuring the degree of wear of the inner surface of the extruder barrel of the present invention, the outer surface of the extruder barrel is provided with a measuring portion to which the probe of the ultrasonic thickness gauge can be brought into contact, and the measuring point is set to this measuring portion. Therefore, the probe can be properly brought into contact with the set measurement point. Moreover, since the measuring method using the ultrasonic thickness gauge is adopted in this manner, the measuring operation is simple and accurate.
【0021】更に、押出機を組み立てた状態のままでの
測定は無論のこと、稼働中での測定も可能であり、バレ
ル更新の時期を正確に把握することができ、適宜測定回
数を増やしても、測定のための著しい工数増加を招かな
いので、経時による緻密な磨耗状況を把握することがで
きる。Further, it goes without saying that the measurement can be performed while the extruder is in the assembled state, and the measurement can be performed while the extruder is in operation, so that the time of barrel renewal can be accurately grasped, and the number of times of measurement can be increased appropriately. However, since the number of man-hours required for measurement does not increase significantly, it is possible to grasp the precise wear condition with time.
【0022】[0022]
【実施例】以下、本発明の実施例について、図面を参照
しながら詳細に説明する。Embodiments of the present invention will now be described in detail with reference to the drawings.
【0023】図1は本発明の押出機バレル内面の磨耗度
測定方法の一例を説明する為の図であって、同図(イ)
は押出機バレルの外面上に測定部を設けた状態を示す断
面図であり、同図(ロ)は同上の矢印(ロ)の方向から
見たバレルの一半部のみを示す一部切欠正面図である。FIG. 1 is a view for explaining an example of a method for measuring the degree of wear of the inner surface of an extruder barrel according to the present invention.
Is a cross-sectional view showing a state in which a measuring portion is provided on the outer surface of the extruder barrel, and FIG. 8B is a partially cutaway front view showing only one half of the barrel as viewed from the direction of arrow B in FIG. Is.
【0024】図1において、Bはバレルであり、その内
部には丸孔1、2が、一部が重なった状態の通孔が貫設
されている。3、4はスクリュー(図示せず)の軸芯で
あって且つ丸孔1、2の軸芯でもあり、相互に異方向に
回転するスクリューを有する2軸押出機用に製作した新
規なものである。バレルBの長さは2m、鋼により製せ
られ且つその内面5、6の表面には、硬度を上げるた
め、窒化法により厚さ0.3mmの窒化層(図示しな
い)が形成されている。7、8はスクリューの軸芯3、
4を通る平面からそれぞれ30°の仰角になる傾斜面で
ある。In FIG. 1, B is a barrel in which round holes 1 and 2 and through-holes partially overlapped with each other are formed. 3 and 4 are the cores of the screws (not shown) and also the cores of the round holes 1 and 2, and are new ones manufactured for a twin-screw extruder having screws that rotate in mutually different directions. is there. The barrel B has a length of 2 m and is made of steel, and a nitride layer (not shown) having a thickness of 0.3 mm is formed on the inner surfaces 5 and 6 of the barrel B by a nitriding method in order to increase hardness. 7, 8 are screw shaft cores 3,
It is an inclined surface having an elevation angle of 30 ° from a plane passing through 4.
【0025】9、10は、バレルBの外面を切削加工し
て形成された平面状の測定部であって、小円形を呈する
探触子11(一方の探触子は説明の便宜上省略)の先端
面の外径より0.1mm大きい外径の円形接触面を有
し、その中心が測定点12、13である。尚、この測定
部9、10が正面視〔同図(ロ)参照〕で窓型を呈する
のは、円形接触面の下側半分をそのまま下方に切削して
掃除し易いようにした為であり、実際の測定部は、上記
下側半分を切削しなかったと仮想した際の円形部分〔図
(ロ)で点線で示した部分〕迄である。Reference numerals 9 and 10 denote flat measuring portions formed by cutting the outer surface of the barrel B, and are of a small circular probe 11 (one probe is omitted for convenience of description). It has a circular contact surface having an outer diameter larger by 0.1 mm than the outer diameter of the tip surface, and the centers thereof are the measurement points 12 and 13. The reason why the measuring units 9 and 10 are window-shaped when viewed from the front [see (b) in the figure] is that the lower half of the circular contact surface is directly cut down to facilitate cleaning. The actual measuring part is up to a circular part (a part shown by a dotted line in FIG. 6B) when it is hypothesized that the lower half is not cut.
【0026】該測定部9、10は、バレル外面の長手方
向左右に、等間隔にそれぞれ4個設けられている。そし
てこの測定部9、10の小平面は、測定点12、13か
らバレルの内面5、6に達する最短距離を結ぶ線(傾斜
面7、8上にあり)が直交するように形成されている。Four measuring units 9 and 10 are provided at equal intervals on the left and right in the longitudinal direction of the outer surface of the barrel. The small planes of the measuring parts 9 and 10 are formed so that the lines connecting the shortest distances from the measuring points 12 and 13 to the inner surfaces 5 and 6 of the barrel (on the inclined surfaces 7 and 8) are orthogonal to each other. .
【0027】上述の装置を用いて、先ず、稼働前の段階
で超音波厚み計により、合計8ヵ所の測定点12、13
におけるバレルの肉厚14、15を測定し、表示部(図
示しない)の数値を記録し、押出機の連続運転を開始し
た。尚、途中で製品仕様の変更等により停止することも
あったが、延べ運転時間の5千時間を節目として、逐次
5千時間が経過した時点毎に各測定点12、13のバレ
ルの肉厚を測定し、上記稼働前、即ちバレル非磨耗時の
バレルの肉厚との偏差を磨耗度とした。尚、一つの節目
における測定工数は、平均15分/1人であった。First, using the above-mentioned apparatus, a total of eight measurement points 12, 13 were measured by an ultrasonic thickness gauge before operation.
The wall thicknesses 14 and 15 of the barrels in Table 2 were measured, the values on the display (not shown) were recorded, and the continuous operation of the extruder was started. Although it may have stopped due to changes in product specifications, etc., the thickness of the barrels at the measuring points 12 and 13 was measured every 5,000 hours, with the total operating time of 5,000 hours as a turning point. Was measured, and the deviation from the thickness of the barrel before the above operation, that is, when the barrel was not worn was defined as the degree of wear. The measurement man-hours at one knot were 15 minutes / one on average.
【0028】その結果を図2に示す。図2において、縦
軸はバレル磨耗度、横軸は運転時間をとって、運転時間
経過に伴う磨耗度の増加傾向をグラフで示した。0点か
らバレルの再加工時点迄の曲線C1とその先のC2とが
本実施例の場合を示し、曲線C1とC3とが従来例の場
合を示している。尚、測定に際しては、測定部9、10
内の上側の半円状の凹部に探触子11をあてがった状態
で、極く僅かに探触子11をスライドさせて幾つかの測
定値を求め、その中で最も薄い寸法を測定値とした。The results are shown in FIG. In FIG. 2, the vertical axis represents the degree of wear of the barrel and the horizontal axis represents the operating time, and a graph showing the increasing tendency of the degree of wear with the elapse of the operating time is shown. A curve C1 from the 0th point to the time of reworking of the barrel and C2 after that point show the case of this embodiment, and curves C1 and C3 show the case of the conventional example. In addition, at the time of measurement, the measurement units 9 and 10
In the state where the probe 11 is applied to the upper semi-circular recess in the inside, the probe 11 is slid very slightly to obtain some measured values, and the thinnest dimension among them is the measured value. did.
【0029】通常、窒化層の厚みは上述の通り0.3m
mであり、この層が磨耗して無くなると、図2の曲線C
3のように、磨耗度が急激に上昇することが、従来の実
績等で判っている。そこで、1万5千時間での測定値を
参考にして、更に1万7千時間で計測した結果、各測定
点での測定値がほぼ0.25mmに達していることが確
認できた。そこで、同じバレルについて再度窒化処理を
施した後、運転を再開した。その後の磨耗度の増加傾向
を示すのが曲線C2である。Generally, the thickness of the nitride layer is 0.3 m as described above.
m, and when this layer is worn away and disappears, the curve C in FIG.
As shown in No. 3, it is known from the past results that the degree of wear sharply rises. Then, referring to the measured value at 15,000 hours and further measuring at 17,000 hours, it was confirmed that the measured value at each measurement point reached approximately 0.25 mm. Therefore, the same barrel was subjected to the nitriding treatment again, and then the operation was restarted. A curve C2 shows a tendency of increasing the degree of wear thereafter.
【0030】その結果、バレルの寿命を知る目安とし
て、バレル磨耗度の管理限界値とされる磨耗度=0.6
mmに達する迄の運転時間は、本来なら2万7千〜2万
8千時間であるが、再度の窒化処理により4万2千時間
まで運転することができた。かくして、本実施例の場
合、改善により延長することのできた運転時間ΔTとし
て、1万5千〜1万6千時間を記録し、バレルの寿命延
長を達成することができた。As a result, as a measure for knowing the life of the barrel, the degree of wear, which is a control limit value of the degree of wear of the barrel, is 0.6.
Originally, the operating time until reaching mm was 27,000 to 28,000 hours, but it was possible to operate up to 42,000 hours by performing the nitriding treatment again. Thus, in the case of the present embodiment, the operating time ΔT that could be extended by the improvement was recorded as 15,000 to 16,000 hours, and the extension of the barrel life could be achieved.
【0031】[0031]
【発明の効果】本発明の押出機バレル内面の磨耗度測定
方法は、超音波厚み計の採用により、簡単な方法で正確
な測定結果が得られると共に、測定の作業性、迅速性、
安全性が改善される。また、バレルの再加工、或いは更
新の時期を予測することができるから、タイムリーなバ
レルの保守管理が可能となり、製品の不良率上昇や押出
機の稼働率低下を招くことがなく、ひいては、生産コス
トの低減、製品の品質向上を図り得る。EFFECT OF THE INVENTION The method for measuring the degree of wear of the inner surface of the extruder barrel of the present invention employs an ultrasonic thickness gauge to obtain accurate measurement results by a simple method, and to improve workability and speed of measurement.
Safety is improved. Further, since it is possible to predict the time for reworking or renewing the barrel, timely maintenance and management of the barrel can be performed, which does not lead to an increase in the defective rate of the product or a decrease in the operating rate of the extruder. It is possible to reduce production costs and improve product quality.
【図1】本発明の押出機バレル内面の磨耗度測定方法の
一例を説明するための図であって、同図(イ)は押出機
バレルの外面上に測定部を設けた状態を示す断面図であ
り、同図(ロ)は同上の矢印(ロ)の方向から見たバレ
ルの一半部のみを示す一部切欠正面図である。FIG. 1 is a view for explaining an example of a method for measuring the degree of wear of the inner surface of an extruder barrel of the present invention, in which FIG. 1 (a) is a cross section showing a state in which a measuring portion is provided on the outer surface of the extruder barrel. It is a figure and the same figure (b) is a partially notched front view which shows only one half part of the barrel seen from the direction of the arrow (b) above.
【図2】同上方法による測定結果に基づくバレルの磨耗
度を、従来例のそれと比較して示すグラフである。FIG. 2 is a graph showing the degree of wear of a barrel based on the measurement result of the same method as that of the conventional example.
【図3】従来の押出機バレル内面の磨耗度測定方法を説
明するための断面図である。FIG. 3 is a cross-sectional view for explaining a conventional method of measuring the degree of wear of the inner surface of an extruder barrel.
B バレル 3、4 スクリューの軸芯 5、6 バレルの内面 7、8 仰角30°の傾斜面 9、10 測定部 11 探触子 12、13 測定点 14、15 バレルの肉厚 B Barrel 3,4 Screw shaft axis 5,6 Barrel inner surface 7,8 Inclined surface with an elevation angle of 30 ° 9,10 Measuring part 11 Transducer 12,13 Measuring point 14,15 Barrel wall thickness
Claims (1)
触子を当接し得る測定部を形成し、この測定部に測定点
を設定し、バレルの非磨耗時と稼働開始後の任意の時点
での、測定点におけるバレルの肉厚を超音波厚み計によ
り計測し、非磨耗時の測定値と稼働開始後のそれとの偏
差を求めることを特徴とする押出機バレル内面の磨耗度
測定方法。1. An external surface of an extruder barrel is provided with a measuring portion to which a probe of an ultrasonic thickness gauge can be brought into contact, and a measuring point is set at this measuring portion, which is optional when the barrel is not worn and after starting operation. At the point of time, the thickness of the barrel at the measurement point is measured with an ultrasonic thickness gauge, and the deviation between the measured value during non-wear and that after the start of operation is determined, and the degree of wear of the inner surface of the extruder barrel is measured. Method.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6284936A JPH08142160A (en) | 1994-11-18 | 1994-11-18 | Measurement of abrasion degree of inner surface of barrel of extruder |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6284936A JPH08142160A (en) | 1994-11-18 | 1994-11-18 | Measurement of abrasion degree of inner surface of barrel of extruder |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH08142160A true JPH08142160A (en) | 1996-06-04 |
Family
ID=17684990
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6284936A Pending JPH08142160A (en) | 1994-11-18 | 1994-11-18 | Measurement of abrasion degree of inner surface of barrel of extruder |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH08142160A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007271621A (en) * | 2006-03-31 | 2007-10-18 | Coperion Werner & Pfleiderer Gmbh & Co Kg | Measuring device for detecting state of abrasion of bore walls of two housing-through bores |
AT510024B1 (en) * | 2010-07-19 | 2012-01-15 | Engel Austria Gmbh | PLASTICIZING UNIT WITH WEAR MEASURING SENSOR |
US20180224265A1 (en) * | 2017-02-08 | 2018-08-09 | Glycon Corp. | Apparatus and method for determining feedscrew and barrel wear |
CN110856969A (en) * | 2018-08-24 | 2020-03-03 | 恩格尔奥地利有限公司 | Plasticizing unit for a molding machine |
KR20210058895A (en) * | 2018-09-13 | 2021-05-24 | 데이비스-스탠다드, 엘엘씨 | Diagnostic troubleshooting system for extrusion units |
-
1994
- 1994-11-18 JP JP6284936A patent/JPH08142160A/en active Pending
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007271621A (en) * | 2006-03-31 | 2007-10-18 | Coperion Werner & Pfleiderer Gmbh & Co Kg | Measuring device for detecting state of abrasion of bore walls of two housing-through bores |
AT510024B1 (en) * | 2010-07-19 | 2012-01-15 | Engel Austria Gmbh | PLASTICIZING UNIT WITH WEAR MEASURING SENSOR |
AT510024A4 (en) * | 2010-07-19 | 2012-01-15 | Engel Austria Gmbh | PLASTICIZING UNIT WITH WEAR MEASURING SENSOR |
US20180224265A1 (en) * | 2017-02-08 | 2018-08-09 | Glycon Corp. | Apparatus and method for determining feedscrew and barrel wear |
US10247534B2 (en) * | 2017-02-08 | 2019-04-02 | Glycon Corp. | Apparatus and method for determining feedscrew and barrel wear |
CN110856969A (en) * | 2018-08-24 | 2020-03-03 | 恩格尔奥地利有限公司 | Plasticizing unit for a molding machine |
AT521584A1 (en) * | 2018-08-24 | 2020-03-15 | Engel Austria Gmbh | Plasticizing unit for a molding machine |
AT521584B1 (en) * | 2018-08-24 | 2020-08-15 | Engel Austria Gmbh | Plasticizing unit for a molding machine |
KR20210058895A (en) * | 2018-09-13 | 2021-05-24 | 데이비스-스탠다드, 엘엘씨 | Diagnostic troubleshooting system for extrusion units |
JP2022500279A (en) * | 2018-09-13 | 2022-01-04 | デービス−スタンダード, エルエルシー | Extruder diagnostic troubleshooting system |
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