JP2001162663A - Pressure detection apparatus for injection molding machine - Google Patents
Pressure detection apparatus for injection molding machineInfo
- Publication number
- JP2001162663A JP2001162663A JP34847899A JP34847899A JP2001162663A JP 2001162663 A JP2001162663 A JP 2001162663A JP 34847899 A JP34847899 A JP 34847899A JP 34847899 A JP34847899 A JP 34847899A JP 2001162663 A JP2001162663 A JP 2001162663A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- ball screw
- injection molding
- load
- molding machine
- 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
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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
- B29C45/50—Axially movable screw
- B29C45/5008—Drive means therefor
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
- B29C45/50—Axially movable screw
- B29C45/5008—Drive means therefor
- B29C2045/5032—Drive means therefor using means for detecting injection or back pressures
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、スクリュ等の可動
部側と駆動機構側の間に荷重変換器を介在させて可動部
に付加される圧力を検出する射出成形機の圧力検出装置
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure detecting device for an injection molding machine for detecting a pressure applied to a movable portion by interposing a load converter between a movable portion such as a screw and a drive mechanism.
【０００２】[0002]
【従来の技術】従来、駆動モータ及びボールねじ機構を
備える駆動機構側とこの駆動機構側により進退駆動せし
められるスクリュ側の間にロードセル（荷重変換器）を
介在させて可動部に付加される圧力を検出する射出成形
機の圧力検出装置は、特公平８−２５６７号公報及び特
開平１０−１５１６５３号公報等で知られている。2. Description of the Related Art Conventionally, a load cell (load converter) is interposed between a drive mechanism having a drive motor and a ball screw mechanism and a screw driven by the drive mechanism. Are known from Japanese Patent Publication No. 8-2567 and Japanese Patent Application Laid-Open No. 10-151653.
【０００３】この種の圧力検出装置は、スクリュを支持
するスクリュ支持部材にロードセルの一端面を固定する
とともに、ボールねじ機構におけるボールねじ部又はナ
ット部にロードセルの他端面を固定し、スクリュ支持部
材とボールねじ部又はナット部間に付加される荷重を検
出する機能を備える。In this type of pressure detecting device, a screw support member for supporting a screw fixes one end surface of a load cell, and a ball screw portion or a nut portion of a ball screw mechanism fixes the other end surface of the load cell to a screw support member. And a function of detecting a load applied between the ball screw portion and the nut portion.
【０００４】[0004]
【発明が解決しようとする課題】しかし、上述した射出
成形機に備える従来の圧力検出装置は、次のような問題
点があった。However, the conventional pressure detecting device provided in the above-described injection molding machine has the following problems.
【０００５】第一に、荷重変換器（ロードセル）は、固
定ねじによりスクリュ支持部材とボールねじ機構の双方
に固定されるため、ボールねじ部又はナット部における
回転方向の無用な応力（荷重）が直接付与され、直進方
向の圧力のみを正確かつ高精度に検出することができな
い。First, since the load converter (load cell) is fixed to both the screw support member and the ball screw mechanism by the fixing screw, unnecessary stress (load) in the rotation direction at the ball screw portion or the nut portion is generated. It is directly applied, and only the pressure in the straight traveling direction cannot be detected accurately and with high accuracy.
【０００６】第二に、荷重変換器は、スクリュ支持部材
とボールねじ機構の連結部材を兼用するため、周辺部で
発生する熱の影響を受けやすく、温度ドリフトによる更
なる正確性及び検出精度の低下を招くとともに、メンテ
ナンスが大変となり、しかも、荷重変換器の劣化（寿
命）を速めてしまうなどの不具合を招く。Secondly, since the load converter also serves as a screw supporting member and a connecting member of a ball screw mechanism, it is susceptible to the heat generated in the peripheral portion, and further increases the accuracy and detection accuracy due to temperature drift. In addition to the reduction, the maintenance becomes difficult, and furthermore, the deterioration (lifetime) of the load converter is accelerated and other problems are caused.
【０００７】本発明は、このような従来の技術に存在す
る課題を解決したものであり、無用な応力及び温度ドリ
フトを排除して正確かつ高精度の圧力検出を安定に行う
ことができるとともに、メンテナンス性の向上、さらに
は荷重変換器の長寿命化を図ることができる射出成形機
の圧力検出装置の提供を目的とする。The present invention has been made to solve the problems existing in the prior art, and can stably perform accurate and highly accurate pressure detection by eliminating unnecessary stress and temperature drift. An object of the present invention is to provide a pressure detection device of an injection molding machine capable of improving maintainability and extending the life of a load converter.
【０００８】[0008]
【課題を解決するための手段及び実施の形態】本発明
は、駆動モータ３及びボールねじ機構４を備える駆動機
構５側とこの駆動機構５側により進退駆動せしめられる
スクリュ２ｓ等の可動部２側の間に、荷重変換器を介在
させて可動部２に付加される圧力を検出する射出成形機
Ｍの圧力検出装置１を構成するに際して、ボールねじ機
構４のナット部４ｎ又はボールねじ部４ｓにフランジ部
６を一体に設け、当該ナット部４ｎ又はボールねじ部４
ｓを、受圧ワッシャ８を介して加圧方向Ｈｐから可動部
２側に結合するとともに、受圧ワッシャ８の外周面に、
当該受圧ワッシャ８の変形から荷重を検出する荷重変換
器９を装着することにより可動部２に付加される圧力を
検出することを特徴とする。The present invention relates to a drive mechanism 5 having a drive motor 3 and a ball screw mechanism 4 and a movable section 2 such as a screw 2s driven by the drive mechanism 5 to move forward and backward. When configuring the pressure detection device 1 of the injection molding machine M that detects the pressure applied to the movable portion 2 with a load converter interposed between the nut portion 4n and the ball screw portion 4s of the ball screw mechanism 4, The flange portion 6 is integrally provided, and the nut portion 4n or the ball screw portion 4 is provided.
s is coupled to the movable part 2 side from the pressing direction Hp via the pressure-receiving washer 8, and is attached to the outer peripheral surface of the pressure-receiving washer 8.
The pressure applied to the movable part 2 is detected by mounting a load converter 9 that detects a load from the deformation of the pressure receiving washer 8.
【０００９】この場合、好適な実施の形態により、荷重
変換器９は、受圧ワッシャ８の外周面に装着するリング
部材１１を有し、このリング部材１１の内周面に歪ゲー
ジ１２ｐ，１２ｑを備える。また、ボールねじ機構４，
４ｅは、左右に一対配設し、一方又は双方のボールねじ
機構４に荷重変換器９を配設することができる。In this case, according to a preferred embodiment, the load converter 9 has a ring member 11 mounted on the outer peripheral surface of the pressure receiving washer 8, and strain gauges 12p, 12q are provided on the inner peripheral surface of the ring member 11. Prepare. Also, the ball screw mechanism 4,
4e can be arranged in a pair on the left and right, and the load converter 9 can be arranged on one or both of the ball screw mechanisms 4.
【００１０】これにより、駆動機構５から加圧され或い
は可動部２から背圧が付与されれば、フランジ部６と可
動部２側の間に介在する受圧ワッシャ８に対して軸方向
から加圧力又は背圧力が付与される。この結果、受圧ワ
ッシャ８は、当該加圧力又は背圧力の大きさに応じて軸
方向に変形し、この変形量が荷重変換器９により検出さ
れる。即ち、受圧ワッシャ８の外周面に装着したリング
部材１１の内周面に備える歪ゲージ１２ｐ，１２ｑによ
り当該変形量が検出され、これに基づいて可動部２に付
加される圧力が検出される。Accordingly, when pressure is applied from the driving mechanism 5 or back pressure is applied from the movable portion 2, the pressure washer 8 interposed between the flange portion 6 and the movable portion 2 is pressed in the axial direction. Alternatively, a back pressure is applied. As a result, the pressure receiving washer 8 is deformed in the axial direction according to the magnitude of the pressing force or the back pressure, and the amount of deformation is detected by the load converter 9. That is, the amount of deformation is detected by the strain gauges 12p and 12q provided on the inner peripheral surface of the ring member 11 mounted on the outer peripheral surface of the pressure receiving washer 8, and the pressure applied to the movable portion 2 is detected based on the amount of deformation.
【００１１】[0011]
【実施例】次に、本発明に係る好適な実施例を挙げ、図
面に基づき詳細に説明する。Next, preferred embodiments according to the present invention will be described in detail with reference to the drawings.
【００１２】まず、本実施例に係る圧力検出装置１を備
える射出成形機Ｍの構成について、図１を参照して説明
する。First, the configuration of an injection molding machine M provided with the pressure detecting device 1 according to the present embodiment will be described with reference to FIG.
【００１３】図１は、射出装置Ｍｉ（平面図）の一部を
示し、この射出装置Ｍｉと不図示の型締装置により射出
成形機Ｍを構成する。同図中、２１は射出台、２２は射
出駆動台であり、それぞれ不図示の機台上面に離間して
設置するとともに、この射出台２１と射出駆動台２２間
には四本のガイドシャフト２３…を架設し、このガイド
シャフト２３…にスライダ２４をスライド自在に装填す
る。FIG. 1 shows a part of an injection device Mi (plan view), and an injection molding machine M is constituted by the injection device Mi and a mold clamping device (not shown). In the figure, reference numeral 21 denotes an injection table, and 22 denotes an injection drive table, which are installed separately from each other on a machine base (not shown). Four guide shafts 23 are provided between the injection table 21 and the injection drive table 22. , And a slider 24 is slidably mounted on the guide shafts 23.
【００１４】また、射出台２１の前面には加熱筒２５の
後端を固定する。加熱筒２５は後部に成形材料を供給す
るホッパー２６を備えるとともに、内部にはスクリュ２
ｓ（可動部２）を挿入する。一方、スクリュ２ｓの後端
は、射出台２１の後方に臨ませ、スライダ２４の中央に
回動自在に支持されるスクリュカップリング３１の前端
に結合する。この場合、スクリュカップリング３１は図
２に示すように、ベアリング２７，２８，２９，３０を
介してスライダ２４に支持される。他方、射出駆動台２
２の中央には、回転伝達シャフト３２をベアリング３３
を介して回動自在に支持する。そして、射出駆動台２２
から前方に突出する回転伝達シャフト３２は、スクリュ
カップリング３１の後端に対してスプライン結合すると
ともに、射出駆動台２２から後方に突出する回転伝達シ
ャフト３２には、歯付被動プーリ３４を取付ける。この
歯付被動プーリ３４には、計量用のサーボモータ３５か
らタイミングベルト３６を介して回転伝達され、スクリ
ュ２ｓが回転駆動せしめられる。A rear end of the heating cylinder 25 is fixed to the front surface of the injection table 21. The heating cylinder 25 is provided with a hopper 26 for supplying a molding material to a rear portion, and a screw 2 is provided inside.
s (movable part 2) is inserted. On the other hand, the rear end of the screw 2s faces the rear of the injection table 21 and is coupled to the front end of a screw coupling 31 rotatably supported at the center of the slider 24. In this case, the screw coupling 31 is supported by the slider 24 via bearings 27, 28, 29, 30 as shown in FIG. On the other hand, the injection drive table 2
2, a rotation transmission shaft 32 is provided with a bearing 33.
It is rotatably supported via. And the injection drive table 22
Is spline-coupled to the rear end of the screw coupling 31, and a toothed driven pulley 34 is attached to the rotation transmission shaft 32 projecting rearward from the injection drive base 22. Rotation is transmitted to the toothed driven pulley 34 from a servomotor 35 for measurement via a timing belt 36, and the screw 2s is driven to rotate.
【００１５】さらに、射出台２１と射出駆動台２２間に
は、左右一対のボールねじ機構４，４ｅを配設する。こ
の場合、一方のボールねじ機構４のボールねじ部４ｓ
は、射出台２１と射出駆動台２２間にベアリングを介し
て回動自在に架設するとともに、ボールねじ機構４のナ
ット部４ｎはスライダ２４の右側に結合する。また、他
方のボールねじ機構４ｅのボールねじ部４ｅｓは、射出
台２１と射出駆動台２２間にベアリングを介して回動自
在に架設するとともに、ボールねじ機構４ｅのナット部
４ｅｎはスライダ２４の左側に結合する。一方、射出駆
動台２２から後方に突出する各ボールねじ部４ｓ，４ｅ
ｓの後端には、それぞれ歯付被動プーリ３７，３８を取
付ける。この歯付被動プーリ３７，３８には、射出用の
サーボモータ３ｓ（駆動モータ３）からタイミングベル
ト３９を介して回転伝達される。このサーボモータ３ｓ
とボールねじ機構４，４ｅはスクリュ２ｓを進退駆動す
る駆動機構５を構成する。そして、一方のナット部４ｎ
とスライダ２４を利用して本実施例に係る圧力検出装置
１を配設する。Further, a pair of left and right ball screw mechanisms 4 and 4e are disposed between the injection table 21 and the injection drive table 22. In this case, the ball screw portion 4s of one ball screw mechanism 4
Is rotatably mounted between the injection table 21 and the injection drive table 22 via a bearing, and the nut 4n of the ball screw mechanism 4 is coupled to the right side of the slider 24. The ball screw portion 4es of the other ball screw mechanism 4e is rotatably mounted between the injection table 21 and the injection drive table 22 via a bearing, and the nut 4en of the ball screw mechanism 4e is located on the left side of the slider 24. To join. On the other hand, each ball screw portion 4s, 4e projecting rearward from the injection drive base 22
At the rear end of s, toothed driven pulleys 37 and 38 are attached. Rotation is transmitted to the toothed driven pulleys 37 and 38 from a servomotor 3s (drive motor 3) for injection via a timing belt 39. This servo motor 3s
And the ball screw mechanisms 4 and 4e constitute a drive mechanism 5 for driving the screw 2s forward and backward. And one nut part 4n
The pressure detecting device 1 according to the present embodiment is disposed using the slider 24 and the slider 24.
【００１６】次に、本実施例に係る圧力検出装置１の構
成について、図１〜図３を参照して説明する。Next, the configuration of the pressure detecting device 1 according to the present embodiment will be described with reference to FIGS.
【００１７】前述したナット部４ｎは外周面が円柱状に
形成されており、このナット部４ｎの後端部には、図２
に示す大径のフランジ部６を一体に設ける。一方、可動
部２（スクリュ２ｓ）側となるスライダ２４にはナット
部４ｎを挿入する挿通孔７を設ける。また、受圧ワッシ
ャ８を用意する。受圧ワッシャ８は、軸方向に一定の厚
さを有し、内径は挿通孔７の内径に略一致させる。そし
て、ナット部４ｎをスライダ２４に結合する際には、受
圧ワッシャ８を嵌めたナット部４ｎを、挿通孔７に対し
て加圧方向Ｈｐから挿入し、不図示のボルトによりフラ
ンジ部６と受圧ワッシャ８を固定するとともに、不図示
のボルトにより受圧ワッシャ８をスライダ２４に固定す
る。これにより、ナット部４ｎはスライダ２４に対して
回転方向には固定されるが、軸方向には固定されない。
なお、以上の結合構造は、ナット部４ｅｎ側においても
同様となる。The nut 4n has an outer peripheral surface formed in a columnar shape. The rear end of the nut 4n has a shape shown in FIG.
The large-diameter flange 6 shown in FIG. On the other hand, the slider 24 on the movable portion 2 (screw 2s) side is provided with an insertion hole 7 into which the nut portion 4n is inserted. Further, a pressure receiving washer 8 is prepared. The pressure-receiving washer 8 has a constant thickness in the axial direction, and the inner diameter is made substantially equal to the inner diameter of the insertion hole 7. When connecting the nut portion 4n to the slider 24, the nut portion 4n fitted with the pressure receiving washer 8 is inserted into the insertion hole 7 from the pressing direction Hp, and the nut portion 4n is connected to the flange portion 6 by a bolt (not shown). While the washer 8 is fixed, the pressure receiving washer 8 is fixed to the slider 24 by a bolt (not shown). Thus, the nut portion 4n is fixed to the slider 24 in the rotation direction, but is not fixed in the axial direction.
The above connection structure is the same on the nut portion 4en side.
【００１８】さらに、一方のナット部４ｎに装着した受
圧ワッシャ８の外周面には、当該受圧ワッシャ８の変形
から荷重を検出する荷重変換器（歪センサ）９を装着す
る。荷重変換器９は、図３に示すように、受圧ワッシャ
８の外周面に装着するリング部材１１を有し、このリン
グ部材１１の内周面に歪ゲージ１２ｐ，１２ｑを備え
る。リング部材１１は、二分割したリング半体１１ｐと
１１ｑからなり、各リング半体１１ｐと１１ｑを受圧ワ
ッシャ８の外周面に装着した後、リング半体１１ｐと１
１ｑを固定ボルト１５，１６により結合することができ
る。また、各リング半体１１ｐと１１ｑの内周面の周方
向中央には歪ゲージ１２ｐ，１２ｑを固定して取付ける
とともに、各歪ゲージ１２ｐ，１２ｑはコントローラ１
７に接続する。なお、各歪ゲージ１２ｐ，１２ｑは各リ
ング半体１１ｐと１１ｑの内周面から若干突出する。よ
って、コントローラ１７は歪ゲージ１２ｐ，１２ｑによ
る検出結果に基づいてサーボモータ３ｓを駆動制御し、
圧力に対するフィードバック制御を行なうことができ
る。Further, a load transducer (strain sensor) 9 for detecting a load from deformation of the pressure receiving washer 8 is mounted on the outer peripheral surface of the pressure receiving washer 8 mounted on the one nut portion 4n. As shown in FIG. 3, the load converter 9 has a ring member 11 mounted on the outer peripheral surface of the pressure receiving washer 8, and has strain gauges 12p and 12q on the inner peripheral surface of the ring member 11. The ring member 11 is composed of two divided ring halves 11p and 11q. After the ring halves 11p and 11q are mounted on the outer peripheral surface of the pressure receiving washer 8, the ring halves 11p and
1q can be connected by fixing bolts 15,16. Strain gauges 12p and 12q are fixedly attached to the center of the inner peripheral surface of each of the ring halves 11p and 11q in the circumferential direction.
Connect to 7. The strain gauges 12p and 12q slightly protrude from the inner peripheral surfaces of the ring halves 11p and 11q. Therefore, the controller 17 drives and controls the servomotor 3s based on the detection results by the strain gauges 12p and 12q,
Feedback control for pressure can be performed.
【００１９】次に、本実施例に係る圧力検出装置１の機
能を含む射出成形機Ｍにおける射出工程の動作につい
て、各図を参照して説明する。Next, the operation of the injection step in the injection molding machine M including the function of the pressure detecting device 1 according to the present embodiment will be described with reference to the drawings.
【００２０】今、射出成形機Ｍは、計量工程が終了した
状態にあるものとする。したがって、スクリュ２ｓは後
退した射出開始位置に位置する。射出工程の開始によ
り、サーボモータ３ｓはコントローラ１７により駆動制
御され、サーボモータ３ｓの回転は、ボールねじ機構
４，４ｅのボールねじ部４ｓ，４ｅｓに伝達される。こ
れにより、ナット部４ｎ，４ｅｎ、スライダ２４及びス
クリュカップリング３１が一体に前進することにより、
スクリュ２ｓも前進移動し、スクリュ２ｓの前方に計量
された樹脂は、不図示の金型内に射出充填される。Now, it is assumed that the injection molding machine M is in a state where the measuring process has been completed. Therefore, the screw 2s is located at the injection start position retreated. At the start of the injection step, the drive of the servo motor 3s is controlled by the controller 17, and the rotation of the servo motor 3s is transmitted to the ball screw portions 4s, 4es of the ball screw mechanisms 4, 4e. As a result, the nut portions 4n and 4en, the slider 24, and the screw coupling 31 move forward integrally,
The screw 2s also moves forward, and the resin measured ahead of the screw 2s is injected and filled into a mold (not shown).
【００２１】この際、ナット部４ｎが前進移動すれば、
フランジ部６と可動部２側の間に介在する受圧ワッシャ
８に対し、フランジ部６から軸方向に加圧力が付与され
る。これにより、受圧ワッシャ８は、当該加圧力の大き
さに応じて軸方向に変形し、この変形量は荷重変換器９
により検出される。即ち、受圧ワッシャ８の外周面に装
着したリング部材１１の内周面に備える歪ゲージ１２
ｐ，１２ｑにより当該変形量が検出され、これにより、
コントローラ１７では当該変形量に対応した圧力（可動
部２に付加される圧力）を検出する。よって、コントロ
ーラ１７は、この検出した圧力値に基づいてサーボモー
タ３ｓを駆動制御し、加圧力（射出圧力，保圧力等）に
対するフィードバック制御を行う。At this time, if the nut portion 4n moves forward,
A pressure is applied from the flange 6 to the pressure washer 8 interposed between the flange 6 and the movable part 2 in the axial direction. As a result, the pressure washer 8 is deformed in the axial direction according to the magnitude of the pressing force.
Is detected by That is, the strain gauge 12 provided on the inner peripheral surface of the ring member 11 mounted on the outer peripheral surface of the pressure receiving washer 8.
The deformation amount is detected by p, 12q,
The controller 17 detects a pressure (pressure applied to the movable portion 2) corresponding to the deformation amount. Therefore, the controller 17 drives and controls the servomotor 3s based on the detected pressure value, and performs feedback control on the pressing force (the injection pressure, the holding pressure, and the like).
【００２２】なお、射出工程における動作を説明した
が、計量工程においては、圧力検出装置１によりスクリ
ュ２ｓ（可動部２）からの背圧力を同様に検出できる。Although the operation in the injection step has been described, the back pressure from the screw 2s (movable part 2) can be similarly detected by the pressure detecting device 1 in the measuring step.
【００２３】このように、本実施例に係る圧力検出装置
１によれば、受圧ワッシャ８の外周面に装着した荷重変
換器９には、ナット部（ボールねじ部）における回転方
向の無用な応力（荷重）が直接付与されないため、直進
方向の圧力のみを正確かつ高精度に検出することができ
る。また、荷重変換器９は、従来のようにスクリュ支持
部材とボールねじ機構の連結部材を兼用しないととも
に、特に、左右に配設したボールねじ機構の一方に配設
したため、メンテナンス性の向上、さらには荷重変換器
９の劣化（寿命）を速めてしまう不具合を回避できる。
しかも、周辺部で発生する熱の影響を受けにくいため、
温度ドリフトによる正確性及び検出精度の低下が回避さ
れる。As described above, according to the pressure detecting device 1 according to the present embodiment, the load transducer 9 mounted on the outer peripheral surface of the pressure receiving washer 8 applies unnecessary stress in the rotation direction at the nut portion (ball screw portion). Since (load) is not directly applied, only the pressure in the straight traveling direction can be detected accurately and with high accuracy. In addition, the load converter 9 does not double as a screw supporting member and a connecting member of a ball screw mechanism as in the related art, and in particular, is disposed on one of the ball screw mechanisms disposed on the left and right, so that maintenance is improved. Can avoid the problem that the deterioration (lifetime) of the load converter 9 is accelerated.
Moreover, because it is less susceptible to the heat generated in the surrounding area,
A decrease in accuracy and detection accuracy due to temperature drift is avoided.
【００２４】以上、実施例について詳細に説明したが、
本発明はこのような実施例に限定されるものではなく、
細部の構成，形状，素材，数量等において、本発明の要
旨を逸脱しない範囲で任意に変更，追加，削除すること
ができる。例えば、可動部２としてスクリュ２ｓを例示
したが、可動部２は、型締機構，射出装置自身などであ
ってもよい。また、荷重変換器９は、一対のボールねじ
機構４，４ｅにおける一方のボールねじ機構４に配設し
た場合を示したが、双方のボールねじ機構４，４ｅに配
設し、二つの荷重変換器９…の平均値を利用してもよい
し、単一のボールねじ機構を備える場合であっても同様
に実施できる。さらに、実施例はナット部４ｎが進退移
動する場合を示したが、ナット部４ｎが回転し、ボール
ねじ部４ｓが進退移動する場合には、例えば、ボールね
じ部４ｓの先端形状をナット部４ｎ及びフランジ部６の
外郭形状と同じに形成すれば、同様に実施できる。The embodiment has been described in detail above.
The present invention is not limited to such an embodiment,
The configuration, shape, material, quantity, etc. of the details can be arbitrarily changed, added, or deleted without departing from the gist of the present invention. For example, although the screw 2s is illustrated as the movable part 2, the movable part 2 may be a mold clamping mechanism, the injection device itself, or the like. In addition, the load converter 9 is shown as being disposed on one of the ball screw mechanisms 4, 4e of the pair of ball screw mechanisms 4, 4e. The average value of the devices 9 can be used, and the same can be applied to the case where a single ball screw mechanism is provided. Further, the embodiment shows the case where the nut portion 4n moves forward and backward. However, when the nut portion 4n rotates and the ball screw portion 4s moves forward and backward, for example, the tip shape of the ball screw portion 4s is changed to the nut portion 4n. If it is formed in the same shape as the outer shape of the flange 6, it can be implemented similarly.
【００２５】[0025]
【発明の効果】このように、本発明に係る射出成形機の
圧力検出装置は、ボールねじ機構のナット部又はボール
ねじ部にフランジ部を一体に設け、当該ナット部又はボ
ールねじ部を、受圧ワッシャを介して加圧方向から可動
部側に結合するとともに、受圧ワッシャの外周面に、当
該受圧ワッシャの変形から荷重を検出する荷重変換器を
装着することにより可動部に付加される圧力を検出する
ため、次のような顕著な効果を奏する。As described above, in the pressure detecting device of the injection molding machine according to the present invention, the nut portion or the ball screw portion of the ball screw mechanism is integrally provided with the flange portion, and the nut portion or the ball screw portion is subjected to pressure receiving. Detects the pressure applied to the movable part by attaching a load transducer that detects the load from the deformation of the pressure-receiving washer on the outer peripheral surface of the pressure-receiving washer while coupling to the movable part side from the pressing direction via the washer. Therefore, the following remarkable effects are obtained.
【００２６】 受圧ワッシャの外周面に装着した荷重
変換器には、ナット部（ボールねじ部）における回転方
向の無用な応力（荷重）が直接付与されないため、直進
方向の圧力のみを正確かつ高精度に検出することができ
る。Since an unnecessary stress (load) in the rotation direction at the nut portion (ball screw portion) is not directly applied to the load transducer mounted on the outer peripheral surface of the pressure receiving washer, only the pressure in the straight traveling direction can be accurately and accurately measured. Can be detected.
【００２７】 荷重変換器は、従来のようにスクリュ
支持部材とボールねじ機構の連結部材を兼用しないた
め、周辺部で発生する熱の影響を受けにくく、温度ドリ
フトによる正確性及び検出精度の低下を回避して安定し
た圧力検出を行うことができるとともに、メンテナンス
性の向上、さらには荷重変換器の長寿命化に貢献するこ
とができる。Since the load converter does not use the screw supporting member and the connecting member of the ball screw mechanism as in the related art, it is hardly affected by the heat generated in the peripheral portion, and the accuracy and the detection accuracy due to the temperature drift are reduced. The pressure can be avoided and stable pressure detection can be performed, and maintenance can be improved, and the life of the load converter can be extended.
【図１】本発明の好適な実施例に係る圧力検出装置を備
える射出成形機における射出装置の一部平面図、FIG. 1 is a partial plan view of an injection device in an injection molding machine including a pressure detection device according to a preferred embodiment of the present invention;
【図２】同射出装置に備える圧力検出装置を抽出して示
す断面図、FIG. 2 is a cross-sectional view illustrating a pressure detection device included in the injection device.
【図３】同圧力検出装置の荷重変換器と受圧ワッシャを
示す一部断面正面図、FIG. 3 is a partial cross-sectional front view showing a load transducer and a pressure receiving washer of the pressure detection device.
１ 圧力検出装置 ２ 可動部 ２ｓ スクリュ ３ 駆動モータ ４ ボールねじ機構 ４ｅ ボールねじ機構 ４ｎ ナット部 ４ｓ ボールねじ部 ５ 駆動機構 ６ フランジ部 ８ 受圧ワッシャ ９ 荷重変換器 １１ リング部材 １２ｐ 歪ゲージ １２ｑ 歪ゲージ Ｍ 射出成形機 Ｈｐ 加圧方向 DESCRIPTION OF SYMBOLS 1 Pressure detection device 2 Movable part 2s screw 3 Drive motor 4 Ball screw mechanism 4e Ball screw mechanism 4n Nut part 4s Ball screw part 5 Drive mechanism 6 Flange part 8 Pressure receiving washer 9 Load converter 11 Ring member 12p Strain gauge 12q Strain gauge M Injection molding machine Hp Pressing direction
Claims (4)
駆動機構側とこの駆動機構側により進退駆動せしめられ
る可動部側の間に、荷重変換器を介在させて可動部に付
加される圧力を検出する射出成形機の圧力検出装置にお
いて、前記ボールねじ機構のナット部又はボールねじ部
にフランジ部を一体に設け、当該ナット部又はボールね
じ部を、受圧ワッシャを介して加圧方向から可動部側に
結合するとともに、前記受圧ワッシャの外周面に、当該
受圧ワッシャの変形から荷重を検出する荷重変換器を装
着することにより可動部に付加される圧力を検出するこ
とを特徴とする射出成形機の圧力検出装置。A pressure converter is provided between a drive mechanism having a drive motor and a ball screw mechanism and a movable section driven by the drive mechanism to detect a pressure applied to the movable section. In the pressure detecting device of the injection molding machine, a flange portion is integrally provided on a nut portion or a ball screw portion of the ball screw mechanism, and the nut portion or the ball screw portion is moved from the pressing direction to the movable portion side through a pressure receiving washer. The pressure of the injection molding machine, wherein the pressure applied to the movable part is detected by attaching a load converter that detects a load from the deformation of the pressure receiving washer on the outer peripheral surface of the pressure receiving washer. Detection device.
ることを特徴とする請求項１記載の射出成形機の圧力検
出装置。2. A pressure detecting device for an injection molding machine according to claim 1, wherein said movable portion is a screw of an injection device.
外周面に装着するリング部材を有し、このリング部材の
内周面に歪ゲージを備えることを特徴とする請求項１記
載の射出成形機の圧力検出装置。3. The injection molding according to claim 1, wherein the load converter has a ring member mounted on an outer peripheral surface of the pressure receiving washer, and a strain gauge is provided on an inner peripheral surface of the ring member. Machine pressure detector.
し、一方又は双方のボールねじ機構に前記荷重変換器を
配設することを特徴とする請求項１記載の射出成形機の
圧力検出装置。4. The pressure detection of an injection molding machine according to claim 1, wherein said ball screw mechanism is provided in a pair on the left and right, and said load converter is provided on one or both ball screw mechanisms. apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34847899A JP3552970B2 (en) | 1999-12-08 | 1999-12-08 | Pressure detector for injection molding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34847899A JP3552970B2 (en) | 1999-12-08 | 1999-12-08 | Pressure detector for injection molding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001162663A true JP2001162663A (en) | 2001-06-19 |
| JP3552970B2 JP3552970B2 (en) | 2004-08-11 |
Family
ID=18397289
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34847899A Expired - Fee Related JP3552970B2 (en) | 1999-12-08 | 1999-12-08 | Pressure detector for injection molding machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3552970B2 (en) |
-
1999
- 1999-12-08 JP JP34847899A patent/JP3552970B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3552970B2 (en) | 2004-08-11 |
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