JPH0735077B2 - Injection molding machine - Google Patents
Injection molding machineInfo
- Publication number
- JPH0735077B2 JPH0735077B2 JP2253178A JP25317890A JPH0735077B2 JP H0735077 B2 JPH0735077 B2 JP H0735077B2 JP 2253178 A JP2253178 A JP 2253178A JP 25317890 A JP25317890 A JP 25317890A JP H0735077 B2 JPH0735077 B2 JP H0735077B2
- Authority
- JP
- Japan
- Prior art keywords
- ring portion
- ball screw
- molding machine
- load cell
- injection molding
- 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.)
- Expired - Fee Related
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)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明はスクリュに付与される圧力を検出する圧力検出
器を内蔵した射出成形機に関する。The present invention relates to an injection molding machine having a pressure detector for detecting the pressure applied to a screw.
従来、スクリュ駆動機構に圧力検出器であるロードセル
を内蔵し、当該ロードセルによりスクリュに付与される
圧力を検出できるようにした射出成形機は、例えば特開
昭64-27921号公報で知られている。Conventionally, an injection molding machine in which a load cell, which is a pressure detector, is built in a screw drive mechanism and the pressure applied to the screw by the load cell can be detected is known, for example, in Japanese Patent Laid-Open No. 64-27921. .
第5図には同公報に開示される射出成形機の要部構成を
簡略化して示す。射出成形機Mは複数のガイドシャフト
51…によりスライド自在に支持され、かつボールネジ機
構52から直進運動が伝達されるガイド継手53を備えると
ともに、スクリュ55の後端を結合し、かつ回転運動が伝
達されるスクリュカップリング54を備え、スクリュカッ
プリング54はアンギュラ玉軸受59…を介してガイド継手
53により回動自在に支持される。また、内環部62、外環
部63及び中間起歪部64からなるワッシャ形ロードセル
(圧力検出器)61を、ガイド継手53とボールネジ機構52
におけるボールナット57間に介在させている。FIG. 5 shows a simplified configuration of the essential parts of the injection molding machine disclosed in this publication. The injection molding machine M has a plurality of guide shafts.
51 includes a guide joint 53 slidably supported by the ball screw mechanism 52 to which a linear motion is transmitted, and a screw coupling 54 that couples a rear end of a screw 55 and transmits a rotational motion, The screw coupling 54 is a guide joint via angular contact ball bearings 59 ...
It is rotatably supported by 53. Further, a washer-type load cell (pressure detector) 61 including an inner ring portion 62, an outer ring portion 63, and an intermediate strain generating portion 64 is provided with a guide joint 53 and a ball screw mechanism 52.
Is interposed between the ball nuts 57 in FIG.
これにより、スクリュ55からの圧力がスクリュカップリ
ング54、アンギュラ玉軸受59…及びガイド継手53を介し
て内環部2に付与されれば、外環部63はボールナット57
に位置規制されているため、中間起歪部64には圧力に対
して相関性を有する歪が発生し、同起歪部64に取付けた
歪ゲージにより圧力が検出される。As a result, if the pressure from the screw 55 is applied to the inner ring portion 2 via the screw coupling 54, the angular ball bearing 59 ... And the guide joint 53, the outer ring portion 63 becomes the ball nut 57.
Since the position is regulated at, the strain having a correlation with the pressure is generated in the intermediate strain generating portion 64, and the pressure is detected by the strain gauge attached to the strain generating portion 64.
しかし、このような射出成形機Mをはじめ、従来の射出
成形機はロードセル61をガイド継手53に直接取付けてい
たため、次のようの問題点があった。However, the conventional injection molding machine including such an injection molding machine M has the following problems because the load cell 61 is directly attached to the guide joint 53.
第一に、ガイド継手53(第1図に符号5で示す)た取付
けられたロードセルからは、第1図に仮想線で示す接続
ケーブルCoが導出され、かつ接続ケーブルCoは射出駆動
台の近傍に配設されるアンプAに接続されるが、ガイド
継手53は成形サイクル毎に同図中仮想線の位置まで前進
後退を繰り返すため、これに伴って、接続ケーブルCoの
屈曲度合が周期的に変化する。この結果、長期の使用に
よって接続ケーブルCoには屈曲による機械的疲労を生
じ、導通不良や断線を招く虞れがあるなど、耐久性及び
信頼性に難点がある。なお、接続ケーブルCoが断線した
場合には射出工程における圧力制御領域でクローズドル
ープ制御のための射出圧力が検出不能となるため、過大
な射出圧力の作用により金型の破損を招く等、重大な故
障の原因となる。First, a connection cable Co shown by an imaginary line in FIG. 1 is derived from the attached load cell having the guide joint 53 (indicated by reference numeral 5 in FIG. 1), and the connection cable Co is near the injection drive base. Although the guide joint 53 is repeatedly moved forward and backward to the position of the imaginary line in the figure in each molding cycle, the bending degree of the connection cable Co is periodically changed. Change. As a result, there is a problem in durability and reliability such that the connection cable Co may be mechanically fatigued due to bending due to long-term use, leading to poor conduction and disconnection. If the connection cable Co is broken, the injection pressure for closed-loop control cannot be detected in the pressure control area in the injection process, so that excessive injection pressure may cause damage to the mold, which is a serious problem. It may cause a failure.
第二に、接続ケーブルCoの長さはガイド継手53の進退移
動に対応させて、ある程度の余裕を持たせる必要がある
ため、接続ケーブルCoの長さが無用に長くなるととも
に、点検作業等においても邪魔な存在となる。Secondly, since the length of the connection cable Co needs to allow a certain amount of allowance in correspondence with the forward / backward movement of the guide joint 53, the length of the connection cable Co becomes unnecessarily long, and in the inspection work etc. Becomes an obstacle.
第三に、発熱源(400℃程度)である加熱筒(第1図符
号12)に近い位置に配設されるため、ロードセル61自体
が熱の影響を受ける。ロードセル61は温度の影響によ
り、零点及び出力の大きさが変化し、結局、高精度の圧
力検出ができなくなる。Thirdly, the load cell 61 itself is affected by heat because it is arranged at a position close to the heating cylinder (reference numeral 12 in FIG. 1) which is a heat source (about 400 ° C.). In the load cell 61, the zero point and the magnitude of the output change due to the influence of the temperature, which makes it impossible to detect the pressure with high accuracy.
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、耐久性及び信頼性を向上させ、しかも、高精
度の圧力検出を行うことができる射出成形機の提供を目
的とするものである。The present invention has solved the problems existing in such conventional techniques, and an object thereof is to provide an injection molding machine capable of improving durability and reliability, and capable of performing highly accurate pressure detection. Is.
本発明は、スクリュ2を進退方向に移動させるボールネ
ジ機構3を備え、ボールネジ機構3のボールナット3n
を、ガイド部4によって進退自在に支持されるガイド継
手5に取付け、かつガイド継手5によりスクリュ2を支
持するとともに、固定された射出駆動台6によって、ボ
ールネジ機構3のボールネジ3sを回動自在に支持してな
る射出成形機1を構成するに際して、特に、スクリュ2
に付与される圧力を検出する圧力検出器、即ち、外環部
7c、内環部7i及び中間起歪部7mからなるワッシャ形のロ
ードセル7を、ボールネジ3sと射出駆動台6の間に配設
するとともに、ボールネジ3sを射出駆動台6に対して軸
方向変位可能に支持することを特徴とする。この場合、
ロードセル7は外環部7cを射出駆動台6に、内環部7iを
ボールネジ3sにそれぞれ固定し、内環部7iにボールネジ
3sの圧力を付与可能に構成する。また、外環部7cはボル
ト8…により、或はカバープレート9により挟んで、射
出駆動台6に固定できるとともに、内環部はボールネジ
に設けたストッパとボールネジに螺着したベアリングナ
ット間に挟んで固定できる。さらにまた、射出駆動台6
には外環部7cに嵌合する位置決め用の切欠凹部6pを設け
るとともに、ロードセル7には軸受(アンギュラ玉軸
受)10に嵌合する位置決め用の切欠凹部7pを設けること
が望ましい。The present invention includes a ball screw mechanism 3 for moving the screw 2 in the advancing / retreating direction, and the ball nut 3n of the ball screw mechanism 3 is used.
Is attached to a guide joint 5 that is supported by a guide portion 4 so as to be able to move back and forth, and the screw 2 is supported by the guide joint 5, and the fixed injection drive base 6 allows the ball screw 3s of the ball screw mechanism 3 to rotate freely. When constructing the injection molding machine 1 which is supported, especially the screw 2
Pressure detector for detecting the pressure applied to the outer ring
A washer-shaped load cell 7 composed of 7c, an inner ring portion 7i and an intermediate strain portion 7m is arranged between the ball screw 3s and the injection drive base 6, and the ball screw 3s can be axially displaced with respect to the injection drive base 6. It is characterized by supporting. in this case,
In the load cell 7, the outer ring portion 7c is fixed to the injection drive base 6 and the inner ring portion 7i is fixed to the ball screw 3s.
It is configured to be able to apply a pressure of 3s. Further, the outer ring portion 7c can be fixed to the injection drive table 6 by being sandwiched by the bolts 8 ... Or by the cover plate 9, and the inner ring portion can be sandwiched between the stopper provided on the ball screw and the bearing nut screwed to the ball screw. Can be fixed with. Furthermore, the injection drive base 6
It is desirable to provide a notch 6p for positioning that fits in the outer ring portion 7c, and a notch 7p for positioning that fits in the bearing (angular ball bearing) 10 in the load cell 7.
本発明に係る射出成形機1によれば、スクリュ2に付与
される圧力はガイド継手5及びボールネジ機構3のボー
ルナット3nを介してボールネジ3sに伝達され、さらに、
ボールネジ3sに付与される圧力はロードセル7の内環部
7iに付与される。一方、ロードセル7における外環部7c
は射出駆動台6側に固定されるため、ロードセル7の中
間起歪部7mには圧力に対応した歪が発生し、発生した歪
は中間起歪部7mに取付けられた歪ゲージによって検出さ
れる。この歪ゲージの出力はスクリュ2に付与される圧
力に比例する。According to the injection molding machine 1 of the present invention, the pressure applied to the screw 2 is transmitted to the ball screw 3s via the guide joint 5 and the ball nut 3n of the ball screw mechanism 3, and
The pressure applied to the ball screw 3s is the inner ring part of the load cell 7.
Granted to 7i. On the other hand, the outer ring portion 7c of the load cell 7
Is fixed to the injection drive base 6 side, strain corresponding to pressure is generated in the intermediate strain generating portion 7m of the load cell 7, and the generated strain is detected by a strain gauge attached to the intermediate strain generating portion 7m. . The output of this strain gauge is proportional to the pressure applied to the screw 2.
この場合、ロードセル7をボールネジ3sとこのボールネ
ジ3sを回動自在に支持する射出駆動台6の間に配設した
ため、ロードセル7は固定された射出駆動台6、即ち、
固定位置に保持される。したがって、成形サイクルによ
り繰り返されるガイド継手5の進退移動には影響され
ず、ロードセル7から導出される接続コードCは定位置
に保持され、かつ長さも短くて足りる。また、ロードセ
ル7は発熱源である加熱筒に対してガイド継手5よりも
離間した位置に存在する射出駆動台6によって保持され
るため、熱影響を受けない。In this case, since the load cell 7 is disposed between the ball screw 3s and the injection drive base 6 that rotatably supports the ball screw 3s, the load cell 7 is fixed to the injection drive base 6, that is,
It is held in a fixed position. Therefore, the connection cord C led out from the load cell 7 is held in a fixed position without being affected by the reciprocating movement of the guide joint 5 which is repeated in the molding cycle, and the length is sufficient. Further, since the load cell 7 is held by the injection drive table 6 which is located at a position farther from the guide joint 5 with respect to the heating cylinder as the heat source, it is not affected by heat.
以下には、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。Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
まず、本発明を明確にするため、射出成形機の全体的な
概略構成について第1図を参照して説明する。First, in order to clarify the present invention, an overall schematic configuration of an injection molding machine will be described with reference to FIG.
1は射出成形機であり、特に、スクリュ駆動機構を示
す。射出成形機1は射出台11とその後方に離間して配し
た射出駆動台6を備え、射出台11と射出駆動台6間には
ガイド部4を構成する複数のガイドシャフト4s…を架設
する。また、ガイドシャフト4s…にはガイド継手5をス
ライド自在に装填する。一方、射出台11には加熱筒12を
備えるとともに、この加熱筒12にはスクリュ2を挿入
し、さらに、スクリュ2の後端はスクリュカップリング
13に結合する。スクリュカップリング13はガイド継手5
の内部に回動自在に支持され、一体に取付けた伝達ギア
14を介して計量のための回転運動が伝達される。Reference numeral 1 is an injection molding machine, and in particular, shows a screw drive mechanism. The injection molding machine 1 includes an injection table 11 and an injection drive table 6 which is arranged behind the injection table 11, and a plurality of guide shafts 4s forming a guide section 4 are installed between the injection table 11 and the injection drive table 6. . A guide joint 5 is slidably mounted on the guide shafts 4s. On the other hand, the injection table 11 is equipped with a heating cylinder 12, the screw 2 is inserted into the heating cylinder 12, and the rear end of the screw 2 is screw-coupled.
Combine to 13. Screw coupling 13 is a guide joint 5
Transmission gear that is rotatably supported inside and attached integrally
The rotary movement for weighing is transmitted via 14.
他方、3はボールネジ3sとボールナット3nからなるボー
ルネジ機構であり、ボールネジ3sは射出駆動台6により
回動自在に支持されるとともに、ボールナット3nはガイ
ド継手5に結合する。そして、ボールネジ3sにはそん後
端に一体に取付けた伝達ギア15を介して回転運動が伝達
され、これにより、ガイド継手5には射出のための進退
運動が伝達される。On the other hand, 3 is a ball screw mechanism composed of a ball screw 3s and a ball nut 3n. The ball screw 3s is rotatably supported by the injection drive base 6, and the ball nut 3n is coupled to the guide joint 5. Then, the rotational movement is transmitted to the ball screw 3s via a transmission gear 15 integrally attached to the rear end thereof, whereby the advancing / retreating movement for injection is transmitted to the guide joint 5.
次に、要部の構成について第1図〜第3図を参照して説
明する。Next, the configuration of the main part will be described with reference to FIGS.
7はロードセル(圧力検出器)である。ロードセル7は
第2図及び第3図に示すように、比較的肉厚の内環部7i
及び外環部7c、それに比較的肉薄の中間起歪部7mによ
り、ワッシャ形に一体形成し、一方の端面には位置決め
用の切欠凹部7pを設ける。また、中間起歪部7mには複数
個(4個の倍数)の歪ゲージ7s…を備える。歪ゲージ7s
…はブリッジ接続し、接続ケーブルCは外環部7cの所定
位置に形成したガイド溝17を通して外部に導出する。と
ころで、ロードセル7の内環部7iと外環部7c間には、通
常、軸方向への相対的な段差を設けている。しかし、本
実施例のロードセル7はこのような段差を設けることな
く、両端面を全面平面カットによる平行面に形成し、加
工性の向上と平行度の向上を図っている。Reference numeral 7 is a load cell (pressure detector). As shown in FIGS. 2 and 3, the load cell 7 has a relatively thick inner ring portion 7i.
The outer ring portion 7c and the intermediate straining portion 7m which is relatively thin are integrally formed in a washer shape, and a notch recess 7p for positioning is provided on one end face. Further, the intermediate strain generating portion 7m is provided with a plurality of (a multiple of 4) strain gauges 7s .... Strain gauge 7s
Are bridge-connected, and the connection cable C is led out to the outside through a guide groove 17 formed at a predetermined position of the outer ring portion 7c. By the way, a relative step in the axial direction is usually provided between the inner ring portion 7i and the outer ring portion 7c of the load cell 7. However, in the load cell 7 of the present embodiment, both end surfaces are formed into parallel surfaces by cutting the entire surface without providing such a step, thereby improving workability and parallelism.
一方、ロードセル7は本発明に従って、ボールネジ3sと
射出駆動台6の間に配設する。その配設方法は次のよう
になる。On the other hand, the load cell 7 is disposed between the ball screw 3s and the injection drive base 6 according to the present invention. The arrangement method is as follows.
まず、射出駆動台6の中心には支持孔6sを設けるととも
に、支持孔6sの後部には比較的大径に形成した位置決め
用の切欠凹部6pを設け、この切欠凹部6pにロードセル7
を収容する。この結果、ロードセル7と射出駆動台6は
嵌合により正確に位置決めされる。また、外嵌部7cは取
付孔7h…に挿入するボルト8…により切欠凹部6pに固定
する。なお、この場合、固定する力は中間起歪部7mには
影響しない。一方、前記支持孔6s内に位置するボールネ
ジ3sの外周部には径方向外方に突出したストッパ19を設
ける。また、ストッパ19の後面とロードセル7における
内環部7iの前端面間にはスラスト軸受20を介在させると
ともに、当該内環部7iの後端面はアンギュラ玉軸受10を
介してボールネジ3sに螺着してベアリングナット22によ
り保持固定する。なお、アンギュラ玉軸受10の外輪部10
cはロードセル7の切欠凹部7pに嵌合して正確に位置決
めされるとともに、内輪部10iはベアリングナット22に
当接する。したがって、ベアリングナット22を締め付け
れば、アンギュラ玉軸受10に予圧が付与される。この場
合、予圧は圧力を検知する中間起歪部7mには影響しない
ようにする。これにより、射出圧力が変化しても荷重と
出力の直線性は変化せず、たとえ、ベアリングナット22
に緩みが生じたとしても零点は変化しない。また、スト
ッパ19の前面は固定プレート24によりアンギュラ玉軸受
25を介して保持固定する。他方、ロードセル7は射出駆
動台6に取付けたカバープレート9で覆う。このカバー
プレート9は不図示の駆動モータを取付けるモータ取付
プレートと一体に形成する。なお、ロードセル7の内環
部7i及びアンギュラ玉軸受10の外輪部10cは射出駆動台
6に対して軸方向変位が許容されるように、カバープレ
ート9の形状を選定し、カバープレート9と内環部7i及
びアンギュラ玉軸受10間に所定の隙間が形成されるよう
に考慮する。また、射出駆動台6の近傍にはアンプAを
取付け、ロードセル7から導出した接続ケーブルCを当
該アンプAに接続するとともに、アンプAは不図示の中
央コントローラに接続する。First, a supporting hole 6s is provided in the center of the injection drive table 6, and a positioning notch 6p having a relatively large diameter is provided at the rear of the supporting hole 6s. The load cell 7 is provided in the notch 6p.
To house. As a result, the load cell 7 and the injection drive table 6 are accurately positioned by fitting. Further, the outer fitting portion 7c is fixed to the notch recess 6p by a bolt 8 inserted into the mounting hole 7h. In this case, the fixing force does not affect the intermediate flexure portion 7m. On the other hand, a stopper 19 protruding radially outward is provided on the outer peripheral portion of the ball screw 3s located in the support hole 6s. Further, a thrust bearing 20 is interposed between the rear surface of the stopper 19 and the front end surface of the inner ring portion 7i of the load cell 7, and the rear end surface of the inner ring portion 7i is screwed to the ball screw 3s via the angular ball bearing 10. It is held and fixed by the bearing nut 22. The outer ring portion 10 of the angular contact ball bearing 10
c is fitted into the cutout recess 7p of the load cell 7 and positioned accurately, and the inner ring portion 10i abuts on the bearing nut 22. Therefore, when the bearing nut 22 is tightened, the angular ball bearing 10 is preloaded. In this case, the preload should not affect the intermediate strain generating portion 7m that detects the pressure. As a result, even if the injection pressure changes, the linearity of load and output does not change.
The zero point does not change even if loosening occurs. In addition, the front surface of the stopper 19 is fixed to the angular contact ball bearing 24.
Hold through 25 and fix. On the other hand, the load cell 7 is covered with a cover plate 9 attached to the injection drive base 6. The cover plate 9 is formed integrally with a motor mounting plate for mounting a drive motor (not shown). The shape of the cover plate 9 is selected such that the inner ring portion 7i of the load cell 7 and the outer ring portion 10c of the angular ball bearing 10 are allowed to be displaced in the axial direction with respect to the injection drive base 6, and the inner shape of the cover plate 9 Consideration should be given to forming a predetermined gap between the ring portion 7i and the angular ball bearing 10. Further, an amplifier A is attached near the injection drive table 6, a connection cable C derived from the load cell 7 is connected to the amplifier A, and the amplifier A is connected to a central controller (not shown).
次に、射出成形機1におけるスクリュ駆動機構における
圧力検出機能について説明する。Next, the pressure detection function of the screw drive mechanism in the injection molding machine 1 will be described.
まず、スクリュ2から付与される圧力(後方への押圧
力)はスクリュカップリング13、ガイド継手5、ボール
ナット3n、ボールスクリュ3s、ストッパ19、スラスト軸
受20を介して内環部7iに付与される。一方、外環部7cは
射出駆動台6に固定され、かつ軸方向に位置規制される
ため、中間起歪部7mには圧力に対応した歪みが発生し、
この歪は中間起歪部7mの歪ゲージ7s…を用いたブリッジ
によって検出される。そして、当該ブリッジの出力は予
圧及びガイド継手5の存在に影響されず、かつスクリュ
2からの圧力に比例する。First, the pressure (backward pressure) applied from the screw 2 is applied to the inner ring portion 7i via the screw coupling 13, the guide joint 5, the ball nut 3n, the ball screw 3s, the stopper 19, and the thrust bearing 20. It On the other hand, since the outer ring portion 7c is fixed to the injection drive table 6 and is axially regulated in position, a strain corresponding to the pressure is generated in the intermediate strain generating portion 7m,
This strain is detected by the bridge using the strain gauges 7s ... Of the intermediate strain portion 7m. The output of the bridge is not affected by the preload and the presence of the guide joint 5, and is proportional to the pressure from the screw 2.
なお、この場合、ロードセル7は射出駆動台6に取付け
られるため、その近傍に配設したアンプAとの距離は僅
かとなり、接続ケーブルCの長さは短かくて足りる。ま
た、射出駆動台6は固定されているため、接続ケーブル
Cの屈曲度合は変化せず、したがって、屈曲疲労も生じ
ない。さらに、ロードセル7は発熱源である加熱筒12か
ら、その熱影響を受けない位置まで完全に離間させるこ
とができるため、ロードセル7(歪ゲージ7s…)は熱影
響を受けない。In this case, since the load cell 7 is attached to the injection drive table 6, the distance between the load cell 7 and the amplifier A arranged in the vicinity thereof is small and the length of the connection cable C is short. Further, since the injection drive table 6 is fixed, the degree of bending of the connection cable C does not change, and therefore bending fatigue does not occur. Further, since the load cell 7 can be completely separated from the heating cylinder 12 which is a heat source to a position where it is not affected by heat, the load cell 7 (strain gauge 7s ...) Is not affected by heat.
他方、第4図には射出成形機1の変更実施例を示す。変
更実施例は外環部7cを射出駆動台6に固定するに際し
て、ネジ止めではなく、カバープレート9によって挟ん
で固定するようにした点が異なる。即ち、支持孔6sにお
ける切欠凹部6pの軸方向長さをロードセル7の外環部7c
の厚さと同一又は若干小さく選定し、かつカバープレー
ト9の内環部7iに対する対向面に、当該内環部7iの変位
を許容する凹部9eを設けて構成した。変更実施例はロー
ドセル7に取付孔7h…を設けないため、ロードセル7を
小型化できる利点がある。なお、その他の構成は第1図
と同一である。したがって、第4図における第1図と同
一部分には同一符号を付し、その構成を明確にするとと
もに、その詳細な説明を省略する。On the other hand, FIG. 4 shows a modified embodiment of the injection molding machine 1. The modified embodiment is different in that the outer ring portion 7c is fixed to the injection drive table 6 by being sandwiched and fixed by the cover plate 9 instead of screwing. That is, the axial length of the cutout recess 6p in the support hole 6s is set to the outer ring portion 7c of the load cell 7.
The thickness is selected to be the same as or slightly smaller than the thickness of the inner ring portion 7i, and a concave portion 9e that allows displacement of the inner ring portion 7i is provided on the surface of the cover plate 9 facing the inner ring portion 7i. In the modified embodiment, since the load cell 7 is not provided with the mounting holes 7h, there is an advantage that the load cell 7 can be downsized. The rest of the configuration is the same as in FIG. Therefore, the same parts in FIG. 4 as those in FIG. 1 are designated by the same reference numerals to clarify the configuration thereof, and detailed description thereof will be omitted.
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、数量等において、本発明の要旨を逸脱しない範囲
で任意に変更できる。Although the embodiments have been described in detail above, the present invention is not limited to such embodiments, and the detailed configuration,
The shape, quantity, etc. can be arbitrarily changed without departing from the scope of the present invention.
本発明に係る射出成形機は、外環部、内環部及び中間起
歪部からなるワッシャ形のロードセルを用いた圧力検出
器を、ボールネジと射出駆動台の間に配設することによ
り、外環部を射出駆動台に、内環部をボールネジにそれ
ぞれ固定し、内環部にボールネジの圧力を付与可能に構
成するとともに、ボールネジを射出駆動台に対して軸方
向変位可能に支持したため、次のような顕著な効果を奏
する。The injection molding machine according to the present invention is provided with a pressure detector using a washer-shaped load cell including an outer ring portion, an inner ring portion, and an intermediate strain portion, and the pressure detector is disposed between the ball screw and the injection drive base to provide Since the ring part is fixed to the injection drive base and the inner ring part is fixed to the ball screw respectively so that the ball screw pressure can be applied to the inner ring part, and the ball screw is supported so as to be axially displaceable with respect to the injection drive base, It has a remarkable effect.
ロードセルは固定側となる射出駆動台に取付けるた
め、接続ケーブルの屈曲疲労による断線等の虞れがなく
なり、耐久性向上及び信頼性向上を達成できる。Since the load cell is attached to the injection drive base on the fixed side, there is no fear of disconnection due to bending fatigue of the connection cable, and durability and reliability can be improved.
ロードセルとアンプを接続する接続ケーブルの長さ
は短かくて足りるため、コスト低減に寄与できるととも
に、邪魔にならないため、点検作業等の作業性向上に寄
与できる。Since the length of the connecting cable connecting the load cell and the amplifier is short, it is possible to contribute to cost reduction as well as to improve workability such as inspection work because it is not an obstacle.
ロードセルは発熱源である加熱筒から、熱影響を受
けない位置まで離間させるため、高精度の圧力検出が可
能になる。Since the load cell is separated from the heating cylinder, which is a heat source, to a position where it is not affected by heat, it is possible to detect pressure with high accuracy.
ロードセルを確実に固定でき、しかも、固定時の予
圧は、中間起歪部に影響しないため、射出圧力が変化し
ても荷重と出力の直線性は変化せず、圧力検出の精度を
高めることができる。The load cell can be securely fixed, and since the preload at the time of fixing does not affect the intermediate strain section, the linearity of the load and output does not change even if the injection pressure changes, improving the accuracy of pressure detection. it can.
使用するロードセルは両端面を全面平面カットによ
る平行面に形成できるため、加工性と平行度が向上し、
ロードセルのコストダウン及び偏平化を図れるととも
に、精度及び品質を高めることができる。Both ends of the load cell used can be formed into parallel surfaces by cutting the entire surface, improving workability and parallelism,
The cost and the flattening of the load cell can be achieved, and the accuracy and quality can be improved.
第1図:本発明に係る射出成形機の要部断面を含む側面
図、 第2図:同射出成形機に用いるロードセルの断面側面
図、 第3図:同ロードセルの背面図、 第4図:本発明の変更実施例に係る射出成形機の要部断
面を含む側面図、 第5図:従来技術に係る射出成形機の原理的断面側面
図。 尚図面中、 1:射出成形機、2:スクリュ 3:ボールネジ機構、3s:ボールネジ 3n:ボールナット、4:ガイド部 5:ガイド継手、6:射出駆動台 6p:切欠凹部、7:ロードセル 7i:内環部、7c:外環部 7m:中間起歪部、7p:切欠凹部 8…:ボルト、9:カバープレート 10:軸受1 is a side view including a cross section of an essential part of an injection molding machine according to the present invention, FIG. 2 is a sectional side view of a load cell used in the injection molding machine, FIG. 3 is a rear view of the load cell, and FIG. FIG. 5 is a side view including a cross section of an essential part of an injection molding machine according to a modified embodiment of the present invention, and FIG. 5: a side sectional view showing the principle of the injection molding machine according to the prior art. In the drawing, 1: injection molding machine, 2: screw 3: ball screw mechanism, 3s: ball screw 3n: ball nut, 4: guide part 5: guide joint, 6: injection drive base 6p: notch recess, 7: load cell 7i: Inner ring part, 7c: Outer ring part 7m: Intermediate flexure part, 7p: Notch recess 8 ...: Bolt, 9: Cover plate 10: Bearing
Claims (6)
ジ機構を備え、ボールネジ機構のボールナットを、ガイ
ド部によって進退自在に支持されるガイド継手に取付
け、かつガイド継手によりスクリュを支持するととも
に、固定された射出駆動台によってボールネジ機構のボ
ールネジを回動自在に支持してなる射出成形機におい
て、外環部、内環部及び中間起歪部からなるワッシャ形
のロードセルを用いた圧力検出器を、前記ボールネジと
前記射出駆動台の間に配設することにより、外環部を射
出駆動台に、内環部をボールネジにそれぞれ固定し、内
環部にボールネジの圧力を付与可能に構成するととも
に、ボールネジを射出駆動台に対して軸方向変位可能に
支持してなることを特徴とする射出成形機。1. A ball screw mechanism for moving a screw in an advancing / retreating direction, a ball nut of the ball screw mechanism is attached to a guide joint that is supported by a guide portion so as to be able to advance and retreat, and the screw is supported and fixed by the guide joint. In an injection molding machine in which a ball screw of a ball screw mechanism is rotatably supported by an injection drive table, a pressure detector using a washer type load cell including an outer ring portion, an inner ring portion and an intermediate strain portion is By arranging between the ball screw and the injection drive table, the outer ring portion is fixed to the injection drive table and the inner ring portion is fixed to the ball screw, and the ball screw pressure is applied to the inner ring portion. An injection molding machine, which supports an injection drive base so as to be displaceable in the axial direction.
ることを特徴とする請求項1記載の射出成形機。2. The injection molding machine according to claim 1, wherein the outer ring portion is fixed to the injection drive table by bolts.
駆動台に固定することを特徴とする請求項1記載の射出
成形機。3. The injection molding machine according to claim 1, wherein the outer ring portion is sandwiched by cover plates and fixed to the injection drive table.
ールネジに螺着したベアリングナット間に挟んで固定す
ることを特徴とする請求項1記載の射出成形機。4. The injection molding machine according to claim 1, wherein the inner ring portion is fixed by being sandwiched between a stopper provided on the ball screw and a bearing nut screwed on the ball screw.
する位置決め用の切欠凹部を有することを特徴とする請
求項1記載の射出成形機。5. The injection molding machine according to claim 1, wherein the injection drive table has a notch for positioning which is fitted to the outer ring portion of the load cell.
の切欠凹部を有することを特徴とする請求項1記載の射
出成形機。6. The injection molding machine according to claim 1, wherein the load cell has a notch recess for positioning that fits into the bearing.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2253178A JPH0735077B2 (en) | 1990-09-20 | 1990-09-20 | Injection molding machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2253178A JPH0735077B2 (en) | 1990-09-20 | 1990-09-20 | Injection molding machine |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH04129719A JPH04129719A (en) | 1992-04-30 |
JPH0735077B2 true JPH0735077B2 (en) | 1995-04-19 |
Family
ID=17247629
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2253178A Expired - Fee Related JPH0735077B2 (en) | 1990-09-20 | 1990-09-20 | Injection molding machine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0735077B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104703727A (en) * | 2012-10-12 | 2015-06-10 | 东洋机械金属株式会社 | Electric die casting machine |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6232169B1 (en) * | 2017-02-08 | 2017-11-15 | 株式会社根本杏林堂 | Injection device, actuator, and manufacturing method of injection device |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0696251B2 (en) * | 1987-07-24 | 1994-11-30 | ファナック株式会社 | Injection molding machine |
JPH01174431A (en) * | 1987-12-28 | 1989-07-11 | Meiki Co Ltd | Method for controlling injection in electrical injection apparatus |
-
1990
- 1990-09-20 JP JP2253178A patent/JPH0735077B2/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104703727A (en) * | 2012-10-12 | 2015-06-10 | 东洋机械金属株式会社 | Electric die casting machine |
Also Published As
Publication number | Publication date |
---|---|
JPH04129719A (en) | 1992-04-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5206034A (en) | Injection molding machine having an annular load cell | |
KR960015300B1 (en) | Injection molding machine having resin pressure detection function | |
US4924713A (en) | Transducer to detect force which is applied to machine tool when machining workpiece and its attaching structure | |
CN109612615B (en) | Testing device for automobile hub bearing load friction torque | |
US20030219504A1 (en) | Pressure measuring device for an injection molding machine | |
JPH0735077B2 (en) | Injection molding machine | |
KR20010087087A (en) | pressure application shaft driving unit in a welding equipment | |
DE102018102327A1 (en) | Force measuring device for detecting machining forces on a machine tool and machine tool with force measuring device | |
JPH0216023A (en) | Injection molding machine | |
JPH0477226A (en) | Injection molder | |
JP4533340B2 (en) | Drive mechanism of injection molding machine | |
US20060073228A1 (en) | Injection device for injection molding machine | |
JP4891696B2 (en) | Injection molding machine | |
JP4533341B2 (en) | Drive mechanism of injection molding machine | |
JPH082567B2 (en) | Injection molding machine | |
JPH09108903A (en) | Pre-load variable spindle | |
JP2005133891A (en) | Preload measuring method and device for bearing | |
JP3570688B2 (en) | Tool abnormality detection device | |
JP2875881B2 (en) | Injection molding machine | |
JP4486613B2 (en) | Drive mechanism of injection molding machine | |
JP2508060Y2 (en) | Injection device with washer-type load cell | |
JP2631521B2 (en) | Injection molding machine | |
JP3552970B2 (en) | Pressure detector for injection molding machine | |
US20230137763A1 (en) | Linear electromechanical actuator | |
SU1380879A1 (en) | Apparatus for simulating power loads on spindle assembly of machine tool |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
LAPS | Cancellation because of no payment of annual fees |