JPH0691683A - Life estimation device of rotary member in injection molding machine - Google Patents
Life estimation device of rotary member in injection molding machineInfo
- Publication number
- JPH0691683A JPH0691683A JP24829292A JP24829292A JPH0691683A JP H0691683 A JPH0691683 A JP H0691683A JP 24829292 A JP24829292 A JP 24829292A JP 24829292 A JP24829292 A JP 24829292A JP H0691683 A JPH0691683 A JP H0691683A
- Authority
- JP
- Japan
- Prior art keywords
- rotations
- fatigue life
- bearing
- motor
- life
- 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.)
- Granted
Links
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、電動式射出成形機の射
出スクリュを加熱筒に対して移動させるボールねじや、
該ボールねじを軸受けしたベアリング等に適用して好適
な、回転部材の寿命予測装置に関する。BACKGROUND OF THE INVENTION The present invention relates to a ball screw for moving an injection screw of an electric injection molding machine with respect to a heating cylinder,
The present invention relates to a device for predicting the life of a rotating member, which is suitable for application to a bearing or the like bearing the ball screw.
【0002】[0002]
【従来の技術】電動式射出成形機においては、電動モー
タでボールねじを回転させて射出スクリュを加熱筒に対
して進退させている。上記ボールねじを軸受けしている
ベアリングは最も負担の大きい部品であり、長期にわた
る使用で交換を余儀無くされる場合もある。従来、上記
ベアリングの交換は、作業員が勘によりその時期を判断
して行っていた。2. Description of the Related Art In an electric injection molding machine, an electric motor rotates a ball screw to move an injection screw forward and backward with respect to a heating cylinder. The bearing bearing the ball screw is the most burdensome component and may be replaced after a long period of use. Conventionally, the replacement of the above-mentioned bearings has been performed by an operator after judging the timing.
【0003】[0003]
【発明が解決しようとする課題】作業員の勘に頼る従来
方式では、ベアリングの交換時期を正確に見極めること
が難しい。交換が早過ぎた場合は、使用可能なベアリン
グを捨てることとなり、交換にかけた手間も無駄にな
る。また、時期を逸してベアリングの交換が遅れた場合
は、ベアリングが破損してその被害がボールねじや金型
等にまでおよぶ可能性がある。With the conventional method that relies on the intuition of the operator, it is difficult to accurately determine the bearing replacement timing. If the replacement is too early, the usable bearings will be discarded and the time and effort required for the replacement will be wasted. Further, if the bearing replacement is delayed due to a delay, the bearing may be damaged and the damage may reach the ball screw, the mold, and the like.
【0004】本発明は、ベアリングやボールねじ等の回
転部材の寿命を的確に予測することができる、射出成形
機等における回転部材の寿命予測装置を提供することを
目的とする。An object of the present invention is to provide a life predicting device for a rotary member in an injection molding machine or the like which can accurately predict the life of a rotary member such as a bearing or a ball screw.
【0005】[0005]
【課題を解決するための手段】上記の目的を達成するた
めに、本発明は、駆動モータによって回転させられる回
転部材の回転数を直接的若しくは間接的に積算する積算
器と、上記回転部材の回転数と回転部材を回転させるの
に要したトルクから回転部材の疲れ寿命を演算する演算
器と、上記積算器で積算された回転部材の総回転数と上
記演算器で演算された回転部材の疲れ寿命とを比較する
比較器とを具備した構成とした。To achieve the above object, the present invention provides an integrator for directly or indirectly integrating the number of rotations of a rotating member rotated by a drive motor, and an integrating device for the rotating member. A calculator for calculating the fatigue life of the rotating member from the rotation speed and the torque required to rotate the rotating member, a total number of rotations of the rotating member accumulated by the integrator, and the rotating member calculated by the calculator. The structure is provided with a comparator for comparing the fatigue life.
【0006】[0006]
【作用】比較器は、積算器で積算された回転部材の総回
転数と、演算器で演算された回転部材の疲れ寿命とを比
較する。作業員は、比較器による上記の比較結果を知
り、回転部材の総回転数が疲れ寿命に近付き、或いは到
達したら、回転部材を交換するなどの対策をとる。The comparator compares the total number of rotations of the rotary member accumulated by the integrator with the fatigue life of the rotary member calculated by the calculator. The worker knows the above comparison result by the comparator, and when the total number of rotations of the rotating member approaches or reaches the fatigue life, takes a measure such as replacing the rotating member.
【0007】[0007]
【実施例】図1は本発明に係る射出成形機等における回
転部材の寿命予測装置の一実施例を示す。この図におい
て符号1はフロントプレートである。フロントプレート
1には加熱筒2が固定されている。フロントプレート1
の後方(図1で右方)にはリヤプレート3がフロントプ
レート1と平行に設けられており、両プレート1,3の
間には一対の同一のボールねじ4,4がベアリング1
a,3aに回転自在に軸受けされて設けられている。各
ボールねじ4の端部には同一径のプーリ5がそれぞれ取
り付けられている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a life predicting apparatus for a rotary member in an injection molding machine or the like according to the present invention. In this figure, reference numeral 1 is a front plate. A heating cylinder 2 is fixed to the front plate 1. Front plate 1
A rear plate 3 is provided in parallel with the front plate 1 at the rear (right side in FIG. 1) of the bearing 1, and a pair of identical ball screws 4 and 4 are provided between the plates 1 and 3.
It is rotatably supported by a and 3a. Pulleys 5 having the same diameter are attached to the ends of each ball screw 4.
【0008】リヤプレート3にはサーボモータ(駆動モ
ータ)6が固定されており、該モータ6の出力軸7に設
けられた駆動プーリ8とプーリ5,5の間にはエンドレ
スのタイミングベルト9が巻き掛けられている。モータ
6は、駆動プーリ8とタイミングベルト9、及びプーリ
5,5を介して、各ボールねじ4,4を互いに同期して
周方向に回転させる。A servo motor (drive motor) 6 is fixed to the rear plate 3, and an endless timing belt 9 is provided between the drive pulley 8 and the pulleys 5 and 5 provided on the output shaft 7 of the motor 6. It is wrapped around. The motor 6 rotates the ball screws 4 and 4 in the circumferential direction in synchronization with each other via the drive pulley 8, the timing belt 9, and the pulleys 5 and 5.
【0009】各ボールねじ4,4にはボールナット11
がそれぞれ螺着されており、該一対のボールナット1
1,11の間にはプレッシャプレート12が架設されて
いる。プレッシャプレート12は各ボールねじ4,4が
回転すると、各ボールナット11,11と一緒に前後方
向(図1で左右方向)に移動する。プレッシャプレート
12の加熱筒2側の前面には、軸受ハウジング13がロ
ードセル等の圧力センサ14を介して取り付けられてい
る。A ball nut 11 is attached to each of the ball screws 4 and 4.
Are respectively screwed, and the pair of ball nuts 1
A pressure plate 12 is installed between 1 and 11. When the ball screws 4 and 4 rotate, the pressure plate 12 moves in the front-rear direction (left-right direction in FIG. 1) together with the ball nuts 11 and 11. A bearing housing 13 is attached to the front surface of the pressure plate 12 on the heating cylinder 2 side via a pressure sensor 14 such as a load cell.
【0010】軸受ハウジング13にはベリアング15が
設けられ、該ベアリング15には回転軸16が回転自在
に支持されている。回転軸16には射出スクリュ17が
取り付けられている。射出スクリュ17は加熱筒2に挿
入されており、プレッシャプレート12と一緒に軸方向
に移動する。サーボモータ6にはパルスエンコーダ等の
位置センサ18が設けられている。A bearing 15 is provided in the bearing housing 13, and a rotary shaft 16 is rotatably supported by the bearing 15. An injection screw 17 is attached to the rotating shaft 16. The injection screw 17 is inserted in the heating cylinder 2 and moves in the axial direction together with the pressure plate 12. The servo motor 6 is provided with a position sensor 18 such as a pulse encoder.
【0011】上記は電動式射出成形機の周知の射出ユニ
ットであり、サーボモータ6によるボールねじ4,4の
回転で射出スクリュ17が軸方向に進退する。The above is a well-known injection unit of an electric injection molding machine, and the rotation of the ball screws 4 and 4 by the servomotor 6 causes the injection screw 17 to advance and retract in the axial direction.
【0012】ところで、上記においてサーボモータ6の
トルクTとベアリング3aに働くスラスト方向の負荷F
との関係は次式で示される。 F=(2πη・T/S)×γ =K1 ・T …(1) 但し、K1 =2πη・γ/S ここで、η:機械効率 S:ボールねじ4のリード γ:ベルト9の変速比By the way, in the above, the torque T of the servo motor 6 and the load F in the thrust direction acting on the bearing 3a.
The relationship with is expressed by the following equation. F = (2πη · T / S) × γ = K 1 · T (1) where K 1 = 2πη · γ / S where η: mechanical efficiency S: lead of ball screw 4 γ: shift of belt 9 ratio
【0013】また、サーボモータ6の回転速度N′とベ
アリング3aの回転速度Nとの関係は次式で表わされ
る。 N=N′/γ=K2 ・N′ …(2) 但し、K2 =1/γThe relationship between the rotation speed N'of the servo motor 6 and the rotation speed N of the bearing 3a is expressed by the following equation. N = N '/ γ = K 2 · N' (2) where K 2 = 1 / γ
【0014】更にまた、ベアリング3aに働く平均荷重
Fm とベアリング3aの平均回転速度Nm は次式で表わ
される。 Fm ={(F1 P ・N1 ・t1 +F2 P ・N2 ・t2 +…+Fn P ・Nn ・t n )/(N1 ・t1 +N1 ・t2 +…+Nn ・tn )}1/P =K1 ×{(P1 P ・N1 ′・t1 +T2 2・N2 ′・t2 +…+TN P ・ Nn ′・tn )/(N1 ′・t1 +N2 ′・t2 +…+Nn ′・tn )}1/P …(3) ここで、ベアリング3aが玉軸受の場合、P:3 ベアリング3aがころ軸受の場合、P:10/3 Nm =(N1 ・t1 +N2 ・t2 +…+Nn ・tn )/(t1 +t2 +…+t n ) =K2 (N1 ′・t1 +N2 ′・t2 +…+Nn ′・tn )/(t1 +t 2 +…+tn ) …(4)Furthermore, the average load acting on the bearing 3a
FmAnd the average rotational speed N of the bearing 3amIs expressed by
To be done. Fm= {(F1 P・ N1・ T1+ F2 P・ N2・ T2+ ... + Fn P・ Nn・ T n ) / (N1・ T1+ N1・ T2+ ... + Nn・ Tn)}1 / P = K1× {(P1 P・ N1′ · T1+ T2 2・ N2′ · T2+ ... + TN P・ Nn′ · Tn) / (N1′ · T1+ N2′ · T2+ ... + Nn′ · Tn)}1 / P (3) Here, when the bearing 3a is a ball bearing, P: 3, and when the bearing 3a is a roller bearing, P: 10/3 Nm= (N1・ T1+ N2・ T2+ ... + Nn・ Tn) / (T1+ T2+ ... + t n ) = K2(N1′ · T1+ N2′ · T2+ ... + Nn′ · Tn) / (T1+ T 2 + ... + tn)… (4)
【0015】また、図2のようにモータ6のトルクTと
回転速度N′を時間Δtごとに検出した場合、時刻0〜
tn までの間にベリアング3aに作用した平均荷重fm
(tn )とこの間の平均回転速度Nm (tn )は次式に
よって表わされる。 fm (tn )=K1 {(T1 P ・N1 ′・Δt+T2 P ・N2 ′・Δt+…+T n P ・Nn ′・Δt)/(N1 ′・Δt+N2 ′・Δt+…+Nn ′・Δt)} 1/P =K1 {(T1 P ・N1 ′+T2 P ・N2 ′+…+Tn P ・Nn ′ )/(N1 ′+N2 ′+…+Nn ′)}1/P …(5) Nm (tn )=K2 (N1 ′・Δt+N2 ′・Δt+…+Nn ′・Δt)/(Δ t+Δt+…+Δt) =K2 (N1 ′+N2 ′+…+Nn ′)/n …(6)Further, as shown in FIG. 2, the torque T of the motor 6
When the rotation speed N ′ is detected every time Δt, the time 0 to
tnAverage load f acting on the belly ang 3a duringm
(Tn) And the average rotation speed N betweenm(Tn) Is
Is represented by fm(Tn) = K1{(T1 P・ N1′ ・ Δt + T2 P・ N2′ ・ Δt +… + T n P ・ Nn′ ・ Δt) / (N1′ ・ Δt + N2′ ・ Δt +… + Nn′ ・ Δt)} 1 / P = K1{(T1 P・ N1′ + T2 P・ N2′ +… + Tn P・ Nn′) / (N1′ + N2′ +… + Nn′)}1 / P … (5) Nm(Tn) = K2(N1′ ・ Δt + N2′ ・ Δt +… + Nn′ · Δt) / (Δt + Δt + ... + Δt) = K2(N1′ + N2′ +… + Nn′) / N (6)
【0016】そして、一般にベアリング3aの疲れ寿命
L10は次の式で示される。 L10=K3 (C/F)P ×106 rev …(7) ここで、C:ベアリング3aの動定格荷重 K3 :ベアリング3aの使用条件による補正係数The fatigue life L 10 of the bearing 3a is generally expressed by the following equation. L 10 = K 3 (C / F) P × 10 6 rev (7) where C: dynamic load rating of the bearing 3 a K 3 : correction coefficient depending on the usage conditions of the bearing 3 a
【0017】符号21は積算器、22は演算器である。
積算器21は、位置センサ18の出力信号を受け、Δt
間におけるモータ6の回転数を0〜tn の間積算してモ
ータ6の総回転数ΣN(tn )を算出する。Reference numeral 21 is an integrator, and 22 is an arithmetic unit.
The integrator 21 receives the output signal of the position sensor 18 and receives Δt
The rotational speed of the motor 6 during by integrating between 0 to t n to calculate the total number of revolutions ΣN of the motor 6 (t n).
【0018】一方、演算器22は、位置センサ18に接
続された速度変換器23から出力される速度(回転速度
Nn ′)と、モータ制御部24からモータ6に出力され
る出力電流(トルクTn )、及び、演算定数設定器25
に設定された定数γ,C,K1 ,K2 ,K3 ,l,η,
Pから、前記(5),(6),(7)式を演算してベア
リング3aの疲れ寿命L10(tn )を求める。この場
合、演算器22は、ベアリング3aの寿命回転数L
10(tn )に変速比γを掛けることによって、本来ベア
リング3aの回転数を積算しなければならないのにモー
タ6の回転数を積算している積算器21との間を整合す
る。モータ6の回転数をベアリング3aの回転に直す別
の演算器を積算器21に付設してもよい。On the other hand, the calculator 22 outputs the speed (rotational speed N n ′) output from the speed converter 23 connected to the position sensor 18 and the output current (torque) output from the motor controller 24 to the motor 6. T n ), and the arithmetic constant setting device 25
Constants γ, C, K 1 , K 2 , K 3 , l, η,
From P, the above equations (5), (6) and (7) are calculated to obtain the fatigue life L 10 (t n ) of the bearing 3a. In this case, the calculator 22 determines that the service life rotation speed L of the bearing 3a is L.
By multiplying 10 (t n ) by the gear ratio γ, the speed is matched with the integrator 21 that is integrating the rotation speed of the motor 6 although the rotation speed of the bearing 3a is originally required to be integrated. Another integrator may be attached to the integrator 21 to convert the rotation speed of the motor 6 into the rotation of the bearing 3a.
【0019】積算器21と演算器22には比較器26が
接続されている。比較器26は、積算器21で積算され
た総回転数ΣN(tn )と演算器22で得られた疲れ寿
命L10(tn )とを比較し、その結果を表示器27に出
力して表示させるとともに、総回転数ΣN(tn )が疲
れ寿命L10(tn )に近付いた場合は警報を出し、また
総回転数ΣN(tn )が疲れ寿命L10(tn )をこえた
時はモータ制御部24に停止指令を出力する。モータ制
御部24は位置センサ18と速度変換器23の出力信号
を受けてモータ6をフィードバック制御する。符号28
は単位時間クロック、29は指令設定器である。A comparator 26 is connected to the integrator 21 and the calculator 22. The comparator 26 compares the total number of revolutions ΣN (t n ) accumulated by the integrator 21 with the fatigue life L 10 (t n ) obtained by the calculator 22, and outputs the result to the display 27. In addition, when the total rotation speed ΣN (t n ) approaches the fatigue life L 10 (t n ), an alarm is issued, and the total rotation speed ΣN (t n ) indicates the fatigue life L 10 (t n ). When it exceeds, a stop command is output to the motor control unit 24. The motor controller 24 receives the output signals of the position sensor 18 and the speed converter 23 and feedback-controls the motor 6. Reference numeral 28
Is a unit time clock, and 29 is a command setting device.
【0020】次に上記のように構成された本発明の射出
成形機等における回転部材の寿命予測装置の作用を説明
する。射出スクリュ17を加熱筒2に対して軸方向に移
動させるためにモータ6を回転させると、積算器21は
その回転数を積算するとともに、演算器22はモータ6
の速度とトルク、及び与えられた定数からベアリング3
aの疲れ寿命を演算し、その結果をそれぞれ比較器26
に出力する。比較器26は、積算器21から出力された
総回転数と演算器22から出力された疲れ寿命を比較し
てその比較結果を表示器27に表示させる。そして総回
転数が疲れ寿命に近付くと警報を発し、また総回転数が
疲れ寿命をこえると停止指令を出力してモータ6を停止
させる。Next, the operation of the life predicting apparatus for the rotary member in the injection molding machine or the like of the present invention constructed as described above will be explained. When the motor 6 is rotated to move the injection screw 17 in the axial direction with respect to the heating cylinder 2, the integrator 21 integrates the number of rotations and the calculator 22 causes the motor 6 to rotate.
Bearing 3 from the speed and torque of
The fatigue life of a is calculated, and the results are calculated by the comparator 26.
Output to. The comparator 26 compares the total number of revolutions output from the integrator 21 with the fatigue life output from the calculator 22, and displays the comparison result on the display 27. When the total number of rotations approaches the fatigue life, an alarm is issued, and when the total number of rotations exceeds the fatigue life, a stop command is output to stop the motor 6.
【0021】上記ではボールねじ4を軸受けしている一
番負担の大きいベアリング3aの寿命予測について述べ
たが、ボールねじ4やベアリング1a,15等の回転部
材、或いは射出成形機以外の機械の回転部材にも本発明
を適用できることは言うまでもない。また、モータ6の
トルクの代りに圧力センサ14で検出される圧力を用い
たり、この圧力とモータ6のトルクを併用することもで
きる。Although the life prediction of the bearing 3a, which bears the ball screw 4 and has the largest load, has been described above, the rotation of the ball screw 4, the rotating members such as the bearings 1a and 15 or the rotation of machines other than the injection molding machine. It goes without saying that the present invention can also be applied to members. Further, the pressure detected by the pressure sensor 14 may be used instead of the torque of the motor 6, or this pressure and the torque of the motor 6 may be used together.
【0022】[0022]
【発明の効果】以上説明したように、本発明は、駆動モ
ータによって回転させられる回転部材の回転数を直接的
若しくは間接的に積算する積算器と、上記回転部材の回
転数と回転部材を回転させるのに要したトルクから回転
部材の疲れ寿命を演算する演算器と、上記積算器で積算
された回転部材の総回転数と上記演算器で演算された回
転部材の疲れ寿命とを比較する比較器とを具備した構成
とされているので、ベアリングやボールねじ等の回転部
材の寿命を正確に知ることができる。したがって、回転
部材の寿命に的確に対応して交換等の対策を都合のよい
時期に合理的に講ずることができる。As described above, according to the present invention, an integrator for directly or indirectly integrating the number of rotations of a rotating member rotated by a drive motor, and the number of rotations of the rotating member and the rotating member are rotated. Comparing a calculator for calculating the fatigue life of the rotating member from the torque required to make it, and comparing the total rotational speed of the rotating member accumulated by the integrator and the fatigue life of the rotating member calculated by the calculator. It is possible to accurately know the life of the rotating member such as the bearing and the ball screw because it is configured to include a container. Therefore, it is possible to rationally take appropriate measures such as replacement in response to the life of the rotating member at a convenient time.
【図1】本発明の射出成形機等における回転部材の寿命
予測装置の一実施例を示すブロック図である。FIG. 1 is a block diagram showing an embodiment of a life predicting apparatus for a rotary member in an injection molding machine or the like of the present invention.
【図2】モータのトルクと回転数の時間に対する変動例
を示す図である。FIG. 2 is a diagram showing a variation example of a motor torque and a rotation speed with respect to time.
3a ベアリング(回転部材) 6 サーボモータ(駆動モータ) 21 積算器 22 演算器 26 比較器 3a Bearing (rotating member) 6 Servo motor (drive motor) 21 Integrator 22 Computing device 26 Comparator
Claims (1)
部材の回転数を直接的若しくは間接的に積算する積算器
と、上記回転部材の回転数と回転部材を回転させるのに
要したトルクから回転部材の疲れ寿命を演算する演算器
と、上記積算器で積算された回転部材の総回転数と上記
演算器で演算された回転部材の疲れ寿命とを比較する比
較器とを具備したことを特徴とする射出成形機等におけ
る回転部材の寿命予測装置。1. An integrator that directly or indirectly integrates the number of rotations of a rotating member rotated by a drive motor, and the number of rotations of the rotating member and the torque required to rotate the rotating member It is characterized by comprising a calculator for calculating a fatigue life and a comparator for comparing the total number of rotations of the rotating member accumulated by the accumulator with the fatigue life of the rotating member calculated by the calculator. A device for predicting the life of rotating members in injection molding machines.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24829292A JPH08409B2 (en) | 1992-09-17 | 1992-09-17 | Device for predicting the life of rotating members in injection molding machines, etc. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24829292A JPH08409B2 (en) | 1992-09-17 | 1992-09-17 | Device for predicting the life of rotating members in injection molding machines, etc. |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0691683A true JPH0691683A (en) | 1994-04-05 |
JPH08409B2 JPH08409B2 (en) | 1996-01-10 |
Family
ID=17175924
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP24829292A Expired - Fee Related JPH08409B2 (en) | 1992-09-17 | 1992-09-17 | Device for predicting the life of rotating members in injection molding machines, etc. |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH08409B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010023330A (en) * | 2008-07-18 | 2010-02-04 | Japan Steel Works Ltd:The | Extruder, life prediction method of thrust bearing and life prediction method |
JP2017196040A (en) * | 2016-04-26 | 2017-11-02 | オリンパス株式会社 | Insertion device and control method of insertion device |
-
1992
- 1992-09-17 JP JP24829292A patent/JPH08409B2/en not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010023330A (en) * | 2008-07-18 | 2010-02-04 | Japan Steel Works Ltd:The | Extruder, life prediction method of thrust bearing and life prediction method |
JP2017196040A (en) * | 2016-04-26 | 2017-11-02 | オリンパス株式会社 | Insertion device and control method of insertion device |
Also Published As
Publication number | Publication date |
---|---|
JPH08409B2 (en) | 1996-01-10 |
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