JPH0450169B2 - - Google Patents
Info
- Publication number
- JPH0450169B2 JPH0450169B2 JP25704886A JP25704886A JPH0450169B2 JP H0450169 B2 JPH0450169 B2 JP H0450169B2 JP 25704886 A JP25704886 A JP 25704886A JP 25704886 A JP25704886 A JP 25704886A JP H0450169 B2 JPH0450169 B2 JP H0450169B2
- Authority
- JP
- Japan
- Prior art keywords
- screw
- molding machine
- hollow ball
- injection molding
- drive
- 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
Links
- 238000001746 injection moulding Methods 0.000 claims description 22
- 230000033001 locomotion Effects 0.000 claims description 12
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 238000002347 injection Methods 0.000 description 11
- 239000007924 injection Substances 0.000 description 11
- 230000007246 mechanism Effects 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 5
- 229920003002 synthetic resin Polymers 0.000 description 5
- 239000000057 synthetic resin Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 239000012778 molding material Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は射出成形機に係り、特に射出及び計量
をサーボモータで駆動する駆動機構を改善した射
出成形機に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an injection molding machine, and more particularly to an injection molding machine with an improved drive mechanism for driving injection and metering using a servo motor.
射出成形機では、スクリユが内蔵された加熱シ
リンダ内にホツパより合成樹脂が充填され、スク
リユの回転により合成樹脂の計量を行い、ついで
スクリユの前進によつて金型に形成されるキヤビ
テイ内に溶融樹脂が射出される。
In an injection molding machine, a heating cylinder with a built-in screw is filled with synthetic resin from a hopper, the synthetic resin is measured by the rotation of the screw, and then melted into the cavity formed in the mold as the screw moves forward. Resin is injected.
従来、このような合成樹脂（成形材料）の計量
及び射出機構の駆動源としてサーボモータを使用
する射出成形機が特開昭61−125823号によつて提
案されている。 Conventionally, an injection molding machine using a servo motor as a drive source for a measuring and injection mechanism for such a synthetic resin (molding material) has been proposed in Japanese Patent Laid-Open No. 125823/1983.
射出成形機の射出部の駆動には、射出工程時の
スクリユの直進運動とともに計量時のスクリユ回
転運動が必要である。上記した射出成形機ではス
クリユを中心とした外周部側にスクリユ回転機構
を有するため、射出工程時のスクリユの直進運動
用にスクリユの中心位置を避けた位置にボールネ
ジを少なくとも２本以上対称に設け、これらのボ
ールネジとプーリとの間にベルトを架設した構造
となつている。このため、射出成形機の駆動部の
機構が大型化するとともに駆動伝達機構が複雑と
なり、計量、射出等の各動作のタイミングのずれ
が生じやすい、しかもベルトを架設したボールネ
ジを少なくとも２本使用していることからボール
ネジによる同調ずれが生じやすく、動作の円滑性
を欠く嫌いがある。
Driving the injection section of an injection molding machine requires linear movement of the screw during the injection process as well as rotational movement of the screw during metering. Since the above-mentioned injection molding machine has a screw rotation mechanism on the outer peripheral side around the screw, at least two or more ball screws are symmetrically provided at positions away from the center of the screw for linear movement of the screw during the injection process. , has a structure in which a belt is installed between these ball screws and pulleys. For this reason, the mechanism of the drive part of the injection molding machine becomes larger and the drive transmission mechanism becomes more complicated, which tends to cause timing lags in each operation such as metering and injection, and moreover, it requires the use of at least two ball screws with belts attached. Because of this, it is easy for the ball screw to be out of synchronization, resulting in a lack of smooth operation.
本発明の目的は、上記した従来技術の問題点を
解消し、射出成形機の駆動部の機構を簡素化し、
各種動作を円滑に行うことができる射出成形機を
提供することにある。 The purpose of the present invention is to solve the above-mentioned problems of the prior art, simplify the mechanism of the drive section of an injection molding machine, and
An object of the present invention is to provide an injection molding machine that can perform various operations smoothly.
上記目的は、サーボモータを駆動源として回転
自在に設けられた中空ボールネジと、該中空ボー
ルネジの外周面に螺合されたボールナツトと、該
ボールナツトの軸方向の移動をスクリユに伝達さ
せるスクリユ駆動軸と、前記中空ボールネジ内に
サーボモータを駆動源として該中空ボールネジと
は独立に回転自在に設けられたスプライン軸とを
設け、該スプライン軸の回転運動を前記スクリユ
駆動軸を介してスクリユに伝達するように構成す
ることによつて達成される。
The above object includes a hollow ball screw that is rotatably provided using a servo motor as a drive source, a ball nut that is screwed onto the outer peripheral surface of the hollow ball screw, and a screw drive shaft that transmits the axial movement of the ball nut to the screw. A spline shaft rotatably provided in the hollow ball screw independently of the hollow ball screw using a servo motor as a drive source is provided in the hollow ball screw, and the rotational movement of the spline shaft is transmitted to the screw via the screw drive shaft. This is achieved by configuring the
射出成形機のチヤージ（計量）時には、サーボ
モータを駆動源としてスプライン軸が回転し、こ
の回転に伴い、スクリユ駆動軸を介してスクリユ
が回転する。
When charging (metering) an injection molding machine, a spline shaft rotates using a servo motor as a drive source, and with this rotation, a screw rotates via a screw drive shaft.
射出成形機における射出時にはサーボモータを
駆動源として中空ボールネジが回転し、この回転
に伴いボールナツトが中空ボールネジの軸方向に
移動し、この移動に伴いスクリユ駆動軸はスクリ
ユを前進させる。 During injection in an injection molding machine, a hollow ball screw rotates using a servo motor as a drive source, and as the ball nut moves in the axial direction of the hollow ball screw, the screw drive shaft moves the screw forward with this movement.
以下、図面に基づいて本発明の実施例について
説明する。
Embodiments of the present invention will be described below based on the drawings.
第１図は、本発明にかかる射出成形機の第１実
施例を示す側断面図である。射出成形機の中心部
には中空ボールネジ１が配設され、この中空ボー
ルネジ１内にはスプライン軸２が挿嵌され、中空
ボールネジ１の外周面にはボールナツト３が螺合
されている。ここで中空ボールネジ１の内周面と
スプライン軸２の外周面との間には互いの運動を
干渉しない程度の隙間が形成され、この隙間には
潤滑剤が注入されている。 FIG. 1 is a side sectional view showing a first embodiment of an injection molding machine according to the present invention. A hollow ball screw 1 is disposed at the center of the injection molding machine, a spline shaft 2 is inserted into the hollow ball screw 1, and a ball nut 3 is screwed onto the outer peripheral surface of the hollow ball screw 1. Here, a gap is formed between the inner circumferential surface of the hollow ball screw 1 and the outer circumferential surface of the spline shaft 2 to the extent that their movements do not interfere with each other, and a lubricant is injected into this gap.
スプライン軸２の軸方向後端部は歯車４が固着
され、この歯車４は駆動側歯車５に噛合され、駆
動側歯車５はACサーボモータ６の回転軸に接続
されている。 A gear 4 is fixed to the rear end of the spline shaft 2 in the axial direction, and this gear 4 is meshed with a drive gear 5, which is connected to a rotating shaft of an AC servo motor 6.
スプライン軸２の軸方向前端部にはスプライン
ナツト７が組みつけられており、このスプライン
ナツト７はスプライン軸２によつて回転させられ
るが軸方向の摺動が自在である。スクリユ駆動軸
９前端にはスクリユ１０が固定されており、後端
にはスプラインナツト７が固定されている。 A spline nut 7 is attached to the front end of the spline shaft 2 in the axial direction, and although the spline nut 7 is rotated by the spline shaft 2, it can freely slide in the axial direction. A screw 10 is fixed to the front end of the screw drive shaft 9, and a spline nut 7 is fixed to the rear end.
中空ボールネジ１の軸方向後端部には歯車１１
が固着され、この歯車１１は駆動側歯車１２を介
してACサーボモータ１３の回転運動が伝達され
るようになつている。 A gear 11 is provided at the rear end of the hollow ball screw 1 in the axial direction.
is fixed, and the rotational motion of an AC servo motor 13 is transmitted to this gear 11 via a drive side gear 12.
中空ボールネジ１の外周面に螺合されたボール
ナツト３にはボルトによりハウジング１４ａが固
着され、このハウジング１４ａに固着されたハウ
ジング１４ｂと駆動軸９との間にはスラストベア
リング１５と圧力センサ１６が設けられている。
なお、図中、１７ａ，１７ｂはエンコーダ、１８
は加熱シリンダである。 A housing 14a is fixed by a bolt to a ball nut 3 screwed onto the outer peripheral surface of the hollow ball screw 1, and a thrust bearing 15 and a pressure sensor 16 are provided between the housing 14b fixed to the housing 14a and the drive shaft 9. It is being
In addition, in the figure, 17a and 17b are encoders, and 18
is a heating cylinder.
次に上記のように構成される射出成形機の作用
について説明する。 Next, the operation of the injection molding machine configured as described above will be explained.
スクリユ１０の回転動作により合成樹脂（成形
材料）をチヤージする場合、まずACサーボーモ
ータ６を駆動し、駆動側歯車５及び歯車４を介し
てスプライン軸２を回転させる。スプライン軸２
の回転はスプラインナツト７によりスクリユ駆動
軸９に伝えられスクリユ１０が回転する。 When charging the synthetic resin (molding material) by rotating the screw 10, the AC servo motor 6 is first driven to rotate the spline shaft 2 via the drive gear 5 and gear 4. Spline shaft 2
The rotation is transmitted to the screw drive shaft 9 by the spline nut 7, and the screw 10 rotates.
スクリユ１０の回転によつて、ホツパ（図示せ
ず）から加熱シリンダ１８内に供給された合成樹
脂は可塑化され溶融状態となり、加熱シリンダ１
８の先端部に滞留する。 As the screw 10 rotates, the synthetic resin supplied from the hopper (not shown) into the heating cylinder 18 is plasticized and molten, and the heating cylinder 1
It stays at the tip of 8.
次にスクリユ１０の前進動作により成形材料の
射出を行う場合、ACサーボモータ１３駆動し、
駆動側歯車１２及び歯車１１介して中空ボールネ
ジ１回転させる。中空ボールネジ１の回転に伴
い、中空ボールネジ１に螺合されたボールナツト
３は前進（図中、左方向）する。ボールナツト３
の前進動作に伴い、ハウジング１４ａ及びハウジ
ング１４ｂが前進し、スラストベアリング１５を
介してスクリユ駆動軸９が前進する。スクリユ駆
動軸９の前進によりスクリユ１０が前進する。 Next, when the molding material is injected by the forward movement of the screw 10, the AC servo motor 13 is driven,
The hollow ball screw is rotated once through the drive side gear 12 and gear 11. As the hollow ball screw 1 rotates, the ball nut 3 screwed into the hollow ball screw 1 moves forward (to the left in the figure). ball nut 3
As the housing 14a and the housing 14b move forward, the screw drive shaft 9 moves forward via the thrust bearing 15. The screw 10 moves forward as the screw drive shaft 9 moves forward.
このようなスクリユ１０の前進動作時、あるい
は射出終了後スクリユ１０後退動作時において、
ACサーボモータ６を駆動し、駆動側歯車５及び
歯車４回転させると、スプライン軸２がスクリユ
駆動軸９の後端に固定されているスプラインナツ
ト７摺動自在に連結されているのでスクリユ１０
の前進及び後退動作に支障はなくスプライン軸２
回転をスクリユ１０に伝達できる。 When the screw 10 moves forward like this, or when the screw 10 moves backward after injection,
When the AC servo motor 6 is driven and the drive side gear 5 and gear 4 are rotated, the spline shaft 2 is slidably connected to the spline nut 7 fixed to the rear end of the screw drive shaft 9.
There is no problem in the forward and backward movement of the spline shaft 2.
Rotation can be transmitted to the screw 10.
圧力センサー１６はハウジング１４ｂとスラス
トベアリング１５ａ間に挟まれており、射出、計
量時のスクリユにかかる樹脂圧を検出し、ACサ
ーボモータ６及び１３にフイールドバツクする。 The pressure sensor 16 is sandwiched between the housing 14b and the thrust bearing 15a, and detects the resin pressure applied to the screw during injection and metering, and feeds it back to the AC servo motors 6 and 13.
第２図は本発明にかかる射出成形機の第２実施
例を示す側断面図である。この射出成形機におい
て、第１実施例に示す射出成形機と異なる点は、
軸受ブロツク１９ａの後端に圧力センサ２０が取
外し自在に設置されていることである。したがつ
て、第２図において、第１図に示す各構成部と実
質的に同一部分は同一引用数字で示し、構造上の
説明は省略する。第２図に示す射出成形機では、
第１実施例の射出成形機と同様の作用効果の他に
特に圧力センサ２０が取外し自在に設置されてい
るから圧力センサ２０のメンテナンスが容易にな
るという効果を有する。 FIG. 2 is a side sectional view showing a second embodiment of the injection molding machine according to the present invention. This injection molding machine is different from the injection molding machine shown in the first embodiment as follows.
A pressure sensor 20 is removably installed at the rear end of the bearing block 19a. Therefore, in FIG. 2, parts that are substantially the same as those shown in FIG. 1 are indicated by the same reference numerals, and structural explanations will be omitted. In the injection molding machine shown in Figure 2,
In addition to the same functions and effects as the injection molding machine of the first embodiment, there is an advantage that maintenance of the pressure sensor 20 is facilitated because the pressure sensor 20 is installed in a removable manner.
以上のように本発明によれば、１本の中空ボー
ルネジに回転トルクを与え、この中空ボールネジ
に螺合されたナツトに推力を発生させて射出駆動
とし、スクリユの回転は中空ボールネジ内に挿通
されたスプライン軸で行うものであるから、射
出、スクリユ回転の伝達機構がほぼ同一中心線上
に並設され、駆動機構が簡素化されるとともに各
種動作のタイミングのずれがなく、ベルト等を使
用しないので同調ずれを防止できる。
As described above, according to the present invention, a rotational torque is applied to one hollow ball screw, a thrust is generated in the nut screwed into this hollow ball screw, and the injection drive is performed, and the rotation of the screw is caused by the screw being inserted into the hollow ball screw. Since the injection and screw rotation transmission mechanisms are arranged parallel to each other on the same center line, the drive mechanism is simplified, there is no difference in the timing of various operations, and belts, etc. are not used. It is possible to prevent synchronization.
第１図は本発明にかかる射出成形機における駆
動部の第１実施例を示す側断面図、第２図は本発
明にかかる射出成形機における駆動部の第２実施
例を示す側断面図である。
１……中空ボールネジ、２……スプライン軸、
３……ボールナツト、４，１１……歯車、５，１
２……駆動側歯車、６，１３……ACサーボモー
タ、７……スプラインナツト、９……スクリユ駆
動軸、１０……スクリユ、１４ａ，１４ｂ，１９
ａ，１９ｂ……ハウジング（軸受ブロツク）、１
５……スラストベアリング、１６，２０……圧力
センサ、１７ａ，１７ｂ……エンコーダ、１８…
…加熱シリンダ。
FIG. 1 is a side cross-sectional view showing a first embodiment of a drive section in an injection molding machine according to the present invention, and FIG. 2 is a side cross-sectional view showing a second embodiment of a drive section in an injection molding machine according to the present invention. be. 1...Hollow ball screw, 2...Spline shaft,
3...Ball nut, 4,11...Gear, 5,1
2... Drive side gear, 6, 13... AC servo motor, 7... Spline nut, 9... Screw drive shaft, 10... Screw, 14a, 14b, 19
a, 19b...Housing (bearing block), 1
5... Thrust bearing, 16, 20... Pressure sensor, 17a, 17b... Encoder, 18...
...Heating cylinder.
Claims (1)
られた中空ボールネジと、該中空ボールネジの外
周面に螺合されたボールナツトと、該ボールナツ
トの軸方向の移動をスクリユに伝達させるスクリ
ユ駆動軸と、前記中空ボールネジ内にサーボモー
タを駆動源として該中空ボールネジとは独立に回
転自在に設けられたスプライン軸とを設け、該ス
プライン軸の回転運動を前記スクリユ駆動軸を介
してスクリユに伝達するように構成されているこ
とを特徴とする射出成形機。1. A hollow ball screw rotatably provided using a servo motor as a drive source, a ball nut screwed onto the outer peripheral surface of the hollow ball screw, a screw drive shaft that transmits axial movement of the ball nut to the screw, and A spline shaft rotatably provided in the ball screw independently of the hollow ball screw is provided using a servo motor as a drive source, and the rotational motion of the spline shaft is transmitted to the screw via the screw drive shaft. An injection molding machine characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25704886A JPS63112135A (en) | 1986-10-30 | 1986-10-30 | Injection molder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25704886A JPS63112135A (en) | 1986-10-30 | 1986-10-30 | Injection molder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63112135A JPS63112135A (en) | 1988-05-17 |
| JPH0450169B2 true JPH0450169B2 (en) | 1992-08-13 |
Family
ID=17301012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25704886A Granted JPS63112135A (en) | 1986-10-30 | 1986-10-30 | Injection molder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63112135A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2667558B2 (en) * | 1990-07-09 | 1997-10-27 | 住友重機械工業株式会社 | Injection device of electric injection molding machine |
-
1986
- 1986-10-30 JP JP25704886A patent/JPS63112135A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63112135A (en) | 1988-05-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |