JPH0516266U - Injection molding equipment - Google Patents
Injection molding equipmentInfo
- Publication number
- JPH0516266U JPH0516266U JP5180891U JP5180891U JPH0516266U JP H0516266 U JPH0516266 U JP H0516266U JP 5180891 U JP5180891 U JP 5180891U JP 5180891 U JP5180891 U JP 5180891U JP H0516266 U JPH0516266 U JP H0516266U
- Authority
- JP
- Japan
- Prior art keywords
- ball screw
- injection molding
- injection
- cooling medium
- screw
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
(57)【要約】
【構成】 ボールネジ８を駆動して射出用スクリュー４
の前後進を行なう構造のものであって、ボールネジ８に
通路２６が設けられており、この通路２６内に一定温度
に保たれた冷却媒体を流すことによって、冷却媒体がボ
ールネジ８に生じる熱を奪いさり該ボールネジ８の温度
変化を抑える。
【効果】 ボールネジ８の温度変化を抑えることができ
るため、ボールネジ８の軸方向の膨張等がなく、射出成
形品の体積および重量を常に一定に保つことができる。
(57) [Summary] [Structure] Driving the ball screw 8 to inject the screw 4
The ball screw 8 is provided with a passage 26, and a cooling medium kept at a constant temperature is caused to flow through the passage 26, whereby the cooling medium generates heat in the ball screw 8. The temperature change of the ball screw 8 is suppressed. [Effect] Since the temperature change of the ball screw 8 can be suppressed, the ball screw 8 does not expand in the axial direction, and the volume and weight of the injection molded product can be kept constant at all times.
Description
【０００１】[0001]
本考案は、ボールネジを駆動して射出用スクリューの前後進を行なうものであ って、ボールネジの温度変化による成形品への影響を抑えることができる射出成 形装置に関する。 The present invention relates to an injection molding device that drives a ball screw to move an injection screw forward and backward, and can suppress the influence of a temperature change of the ball screw on a molded product.
【０００２】[0002]
工作機に使用されるボールネジは主に位置決めを目的としているため、これに 過大な荷重は作用せずまた力の作用も静的に近いものであるが、射出成形装置の ボールネジは一本のボールネジで高速の射出速度と２０００kg/cm2以上におよぶ 射出圧とを発生させる必要があり力の作用も動的である。また、射出成形のサイ クルは一般に数秒〜数十秒でありそのサイクルで２４時間連続運転される事もあ り得る。さらに、射出成形装置の周辺には、加熱筒のヒータおよびホッパードラ イヤー等の発熱源があり周辺温度も高い。以上の要因により、射出成形装置のボ ールネジはそれ自体が高温となる可能性が十分にあるが、従来は特記すべき熱対 策を施していないのが実状であった。Since the ball screw used in machine tools is mainly for the purpose of positioning, no excessive load acts on it and the action of force is close to static. Therefore, it is necessary to generate a high injection speed and an injection pressure of 2000 kg / cm 2 or more, and the action of force is dynamic. In addition, the cycle of injection molding is generally several seconds to several tens of seconds, and the cycle may be continuously operated for 24 hours. Further, there are heat sources such as a heater of a heating cylinder and a hopper dryer around the injection molding device, and the ambient temperature is high. Due to the above factors, the ball screw of the injection molding machine may have a high temperature itself, but in the past it was the actual situation that no special heat countermeasure was taken.
【０００３】 そして、上記したボールネジの温度変化は、例えば以下のように射出成形品の 体積および重量に影響を与えることが考えられる。 例えば、長さＬmmのボールネジが、運転により運転開始時に比べて温度を３０ ℃上昇させたとすると軸の延びδは、 δ＝ρ×θ×Ｌ ＝１２．０×１０-6×３０×Ｌ ＝３．６×１０-4×Ｌ（mm） で求められることになり、 いま、Ｌはスクリューストロークと仮定し、スクリュー径をφＤとすれば、射 出量の変化ΔＶは、 ΔＶ＝π／４×Ｄ2×δ となり、 よって、射出体積の変化率が ΔＶ／Ｖ0＝３．６×１０-4＝０．０３６（％） となってしまう。It is considered that the above-mentioned temperature change of the ball screw affects the volume and weight of the injection-molded product as follows, for example. For example, if a ball screw having a length of L mm raises the temperature by 30 ° C. by the operation as compared with the time when the operation is started, the extension δ of the shaft is δ = ρ × θ × L = 12.0 × 10 −6 × 30 × L = It will be calculated by 3.6 × 10 −4 × L (mm). Now, assuming that L is the screw stroke and the screw diameter is φD, the change ΔV in the emission amount is ΔV = π / 4 × D 2 × δ becomes, therefore, the rate of change of the injection volume ΔV / V 0 = 3.6 × 10 becomes -4 = 0.036 (%).
【０００４】[0004]
精密成形の場合、例えば成形品重量のバラツキの幅を０．０５（％）程度に収 める必要を生じる場合等があるが、このような場合においては上述の値が少なか らず影響をおよぼし、成形品の中には所定精度の重量範囲内に収らないものが生 じる可能性があった。 In the case of precision molding, for example, it may be necessary to keep the variation in the weight of molded products within about 0.05 (%), but in such cases, the above values are not small and may affect However, there is a possibility that some of the molded products may not fall within the weight range of the specified accuracy.
【０００５】 したがって、本考案の目的は、射出成形品の重量を常に一定に維持することが できる射出成形装置を提供することである。Therefore, it is an object of the present invention to provide an injection molding device capable of maintaining the weight of an injection molded product always constant.
【０００６】[0006]
上記目的を達成するために、本考案の射出成形装置は、ボールネジを駆動して 射出用スクリューの前後進を行なうものであって、前記ボールネジに冷却媒体流 入出用の通路が設けられていることを特徴としている。 In order to achieve the above object, the injection molding apparatus of the present invention drives a ball screw to move the injection screw forward and backward, and the ball screw is provided with a passage for inflow and outflow of a cooling medium. Is characterized by.
【０００７】[0007]
本考案の射出成形装置によれば、ボールネジに設けられた通路内に一定温度に 保たれた冷却媒体を流すことによって、該冷却媒体が該ボールネジに生じる熱を 奪いさり該ボールネジの温度変化を抑えることになる。 According to the injection molding apparatus of the present invention, a cooling medium kept at a constant temperature is made to flow in the passage provided in the ball screw, so that the cooling medium absorbs the heat generated in the ball screw and suppresses the temperature change of the ball screw. It will be.
【０００８】[0008]
本考案の一実施例による射出成形装置を図１および図２を参照して以下に説明 する。なお、図１は本実施例の射出成形装置の主要部分を示す平面図、図２は本 実施例の射出成形装置の冷却回路の構成図である。 An injection molding apparatus according to an embodiment of the present invention will be described below with reference to FIGS. 1 and 2. 1 is a plan view showing the main part of the injection molding apparatus of this embodiment, and FIG. 2 is a block diagram of the cooling circuit of the injection molding apparatus of this embodiment.
【０００９】 図１中、１は本実施例の射出成形装置、２は内部に射出材料である樹脂等が入 れられる加熱筒、３は加熱筒２と直交して設けられ該加熱筒２をそのほぼ中央で 支持する先端側支持部材、４は加熱筒２内に挿入されるとともに前進時に加熱筒 ２内の樹脂等を射出させる射出スクリュー、５は射出スクリュー４に直交して設 けられ、該射出スクリュー４の後端部６を中央部分で回転自在に支持する押圧板 である。In FIG. 1, 1 is an injection molding apparatus of the present embodiment, 2 is a heating cylinder into which a resin or the like as an injection material is put, 3 is provided orthogonal to the heating cylinder 2, and the heating cylinder 2 is provided. The leading end side supporting member 4 which supports at approximately the center thereof is inserted into the heating cylinder 2, and an injection screw 5 for injecting the resin and the like in the heating cylinder 2 at the time of forward movement is provided orthogonal to the injection screw 4. A pressing plate that rotatably supports the rear end portion 6 of the injection screw 4 in the central portion.
【００１０】 押圧板５の先端側支持部材３と反対側には、これらと平行をなす後端側支持部 材７が先端側支持部材３と一体に結合して設けられており、これら先端側支持部 材３、押圧板５および後端側支持部材７の両端部には、射出スクリュー４と平行 をなすボールネジ８がそれぞれ設けられている。On the opposite side of the pressing plate 5 from the front end side supporting member 3, a rear end side supporting member 7 parallel to the front end side supporting member 3 is provided integrally with the front end side supporting member 3. Ball screws 8 parallel to the injection screw 4 are provided at both ends of the supporting member 3, the pressing plate 5, and the rear end side supporting member 7.
【００１１】 各ボールネジ８は、先端側支持部材３に取り付けられる先端側軸受体９と、後 端側支持部材７に取り付けられる後端側軸受体１０と、これら両軸受体９，１０ により回転自在に支持される軸部１１と、押圧板５に取り付けられたボールナッ ト１２とを有している。ここで、ボールナット１２は軸部１１の回転により押圧 板５を所定のピッチで前後進させるものである。また、各ボールネジ８の軸部１ １の後端部１１ｂには、駆動プーリ１３がそれぞれ取付けられており、両駆動プ ーリ１３は、射出用モータ１４の駆動プーリ１５とともに外周部をタイミングベ ルト１６で巻回されていて該射出用モータ１４で駆動されて所定速度で回転する ようになっている。Each ball screw 8 is rotatable by a front end bearing body 9 attached to the front end side support member 3, a rear end side bearing body 10 attached to the rear end side support member 7, and both bearing bodies 9 and 10. It has a shaft portion 11 supported by a ball nut 12 attached to the pressing plate 5. Here, the ball nut 12 moves the pressing plate 5 forward and backward at a predetermined pitch by the rotation of the shaft 11. A drive pulley 13 is attached to the rear end 11b of the shaft portion 11 of each ball screw 8, and both drive pulleys 13 and the drive pulley 15 of the injection motor 14 are connected to the outer periphery of the drive pulley 13. It is wound around a belt 16 and is driven by the injection motor 14 to rotate at a predetermined speed.
【００１２】 各ボールネジ８の軸部１１の軸心部には、先端部１１ａから後端部１１ｂの手 前にかけて延在する軸穴１７が設けられており、該軸穴１７の後端部１１ｂの側 には該軸穴１７と直交して軸部１１の外周部に貫通する貫通穴１８が相互に直交 するよう二ケ所設けられている。A shaft hole 17 extending from the front end 11 a to the front of the rear end 11 b is provided at the shaft center of the shaft 11 of each ball screw 8, and the rear end 11 b of the shaft hole 17 is provided. On this side, there are provided two through holes 18 orthogonal to the shaft hole 17 and penetrating the outer peripheral portion of the shaft portion 11 so as to be orthogonal to each other.
【００１３】 また、先端側軸受体９には、軸部１１の先端面１９との間に空間部２０を設け て該軸部１１の先端部１１ａを覆うケーシング２１が取付けられており、軸部１ １の先端部１１ａ側の穴部１７を外部に連通させるために該ケーシング２１の先 端部には連通穴２２が設けられている。Further, the tip end side bearing body 9 is provided with a casing 21 which is provided with a space 20 between the tip end surface 19 of the shaft portion 11 and covers the tip end portion 11 a of the shaft portion 11. A communication hole 22 is provided at the front end of the casing 21 in order to communicate the hole 17 on the front end 11a side of the casing 11 with the outside.
【００１４】 さらに、後端側軸受体１０には、軸部１１の貫通穴１８の外側開口部１８ａを 覆うように筒部材２３が固定して設けられており、貫通穴１８を外部に連通させ るためにこの筒部材２３にも連通穴２４が設けられている。なお、貫通穴１８は 軸部１１の回転によってその外側開口部１８ａが周方向に移動することになるた め、貫通穴１８と連通穴２４とを常に連通させるために、筒部材２３の内周には 環状溝２５が形成されている。筒状部材２３の該環状溝２５の前後位置にはシー ル２３ａ，２３ａが装着されている。Further, a cylindrical member 23 is fixedly provided on the rear end side bearing body 10 so as to cover the outer opening 18a of the through hole 18 of the shaft portion 11, and the through hole 18 is communicated with the outside. Therefore, the cylindrical member 23 is also provided with a communication hole 24. Since the outer opening 18a of the through hole 18 is moved in the circumferential direction by the rotation of the shaft portion 11, the inner circumference of the tubular member 23 is kept in order to keep the through hole 18 and the communication hole 24 in communication with each other. An annular groove 25 is formed in the. Seals 23a, 23a are attached to the front and rear positions of the annular groove 25 of the tubular member 23.
【００１５】 そして、上記したケーシング２１の連通穴２２、空間部２０、軸部１１の軸穴 １７、貫通穴１８、環状空間部２５および筒部材２３の連通穴２４が、本実施例 における冷却媒体を流入出させる通路２６となる。The communication hole 22 of the casing 21, the space 20, the shaft hole 17 of the shaft 11, the through hole 18, the annular space 25, and the communication hole 24 of the tubular member 23 are the cooling medium in this embodiment. Becomes a passage 26 for letting in and out.
【００１６】 次に、この通路２６内に水、エアー等の冷却媒体を流入出させる冷却回路につ いて説明する。図２中、２７は本実施例の冷却回路、２８はボールネジ８から流 れてくる冷却媒体内のゴミ等を除去するためのフィルタ、２９はフィルタ２８の 下流側に設けられ冷却媒体の温度を所定の温度に冷却するための熱交換器、３０ は熱交換器２９の下流側に設けられ冷却回路２７およびボールネジ８の通路２６ 内に冷却媒体を循環させるためのポンプ、３１はポンプ３０の下流側に設けられ 冷却回路２７およびボールネジ８の通路２６を流れる冷却媒体の流量を調整する 流量調整弁、３２は冷却媒体の管理温度を設定するとともに冷却媒体の温度を所 定温度に保つため流量調整弁３１を適宜制御する温度設定器、３３は流量調整弁 ３１の下流側に設けられ冷却媒体の温度を計測し温度設定器３２にこの温度を伝 送する温度センサである。Next, a cooling circuit that allows a cooling medium such as water or air to flow in and out of the passage 26 will be described. In FIG. 2, 27 is the cooling circuit of the present embodiment, 28 is a filter for removing dusts and the like in the cooling medium flowing from the ball screw 8, 29 is provided on the downstream side of the filter 28 to control the temperature of the cooling medium. A heat exchanger for cooling to a predetermined temperature, 30 is a pump provided on the downstream side of the heat exchanger 29 for circulating a cooling medium in the cooling circuit 27 and the passage 26 of the ball screw 8, and 31 is a downstream of the pump 30. A flow rate adjusting valve, which is provided on the side to adjust the flow rate of the cooling medium flowing through the cooling circuit 27 and the passage 26 of the ball screw 8, 32 is a flow rate adjusting valve for setting the control temperature of the cooling medium and for maintaining the temperature of the cooling medium at a predetermined temperature. A temperature setter that appropriately controls the valve 31 is a temperature sensor that is provided on the downstream side of the flow rate adjustment valve 31 and that measures the temperature of the cooling medium and transmits this temperature to the temperature setter 32.
【００１７】 また、熱交換器２９には、冷却ガスがコンプレッサ３４により循環されており 、この冷却ガスはコンプレッサ３４の上流側に設けられたラジエター３５内を通 過する際にファン３６により冷却されるようになっている。なお、図２中、冷却 媒体および冷却ガスの流れをそれぞれ矢印で示している。Further, in the heat exchanger 29, a cooling gas is circulated by a compressor 34, and the cooling gas is cooled by a fan 36 when passing through a radiator 35 provided on the upstream side of the compressor 34. It has become so. In FIG. 2, the flow of the cooling medium and the flow of the cooling gas are shown by arrows.
【００１８】 このような構造の射出成形装置１によれば、ケーシング２１の連通穴２２を冷 却回路２７の吐出側に、筒部材２３の連通穴２４を吸入側にそれぞれ接続し、射 出成形時に冷却回路２７のポンプ３０を駆動して、冷却回路２７内で一定温度に 維持された冷却媒体を該冷却回路２７およびボールネジ８に設けられた通路２６ 内を循環させる。これによって、加熱筒２のヒータおよびホッパードライヤー等 による周辺温度の上昇によりボールネジ８に伝達される熱と、成形時の高負荷お よび連続サイクル成形等によるボールネジ８自体の発熱とを、冷却媒体がボール ネジ８内を流れる際に奪いさり、ボールネジ８の温度変化を抑える。 したがって、ボールネジ８の熱変位が生じることなく、ボールネジ８による円 滑かつ正確な射出スクリューの移動が行え、樹脂の計量および射出の精度を安定 に維持することができる。According to the injection molding apparatus 1 having such a structure, the communication hole 22 of the casing 21 is connected to the discharge side of the cooling circuit 27, and the communication hole 24 of the tubular member 23 is connected to the suction side, respectively. At some times, the pump 30 of the cooling circuit 27 is driven to circulate the cooling medium maintained at a constant temperature in the cooling circuit 27 through the cooling circuit 27 and the passage 26 provided in the ball screw 8. As a result, the heat transmitted to the ball screw 8 due to the rise in the ambient temperature due to the heater of the heating cylinder 2 and the hopper dryer, and the high load during molding and the heat generated by the ball screw 8 itself due to continuous cycle molding are controlled by the cooling medium. It is taken away when flowing in the ball screw 8 to suppress the temperature change of the ball screw 8. Therefore, the ball screw 8 can be smoothly and accurately moved without causing thermal displacement of the ball screw 8, and the precision of resin measurement and injection can be stably maintained.
【００１９】[0019]
以上詳述したように、本考案の射出成形装置は、ボールネジの温度変化を抑え ることができるため、ボールネジの軸方向の膨張等がなく、射出成形品の体積お よび重量を常に一定に保つことができる。 As described above in detail, the injection molding device of the present invention can suppress the temperature change of the ball screw, so that there is no expansion in the axial direction of the ball screw and the volume and weight of the injection molded product are always kept constant. be able to.
【図１】本考案の一実施例による射出成形装置の本願に
かかわる主要部分を示す平面図である。FIG. 1 is a plan view showing a main part of the present invention of an injection molding apparatus according to an embodiment of the present invention.
【図２】本考案の一実施例による射出成形装置の冷却回
路の構成図である。FIG. 2 is a configuration diagram of a cooling circuit of an injection molding apparatus according to an embodiment of the present invention.
１ 射出成形装置 ４ スクリュー ８ ボールネジ ２６ 通路 1 Injection molding device 4 Screw 8 Ball screw 26 Passage
Claims (1)
の前後進を行なう射出成形装置において、 前記ボールネジに冷却媒体流入出用の通路が設けられて
いることを特徴とする射出成形装置。1. An injection molding apparatus for driving a ball screw to move an injection screw forward and backward, wherein the ball screw is provided with a passage for inflow and outflow of a cooling medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5180891U JPH0516266U (en) | 1991-07-04 | 1991-07-04 | Injection molding equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5180891U JPH0516266U (en) | 1991-07-04 | 1991-07-04 | Injection molding equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0516266U true JPH0516266U (en) | 1993-03-02 |
Family
ID=12897220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5180891U Pending JPH0516266U (en) | 1991-07-04 | 1991-07-04 | Injection molding equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0516266U (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6062438A (en) * | 1983-09-12 | 1985-04-10 | Shiyouun Kosakusho:Kk | Cooling device for ball-and-screw shaft |
| JPS6377722A (en) * | 1986-09-19 | 1988-04-07 | Fanuc Ltd | Injection mechanism for injection molding machine |
| JPH02250746A (en) * | 1989-03-24 | 1990-10-08 | Okuma Mach Works Ltd | Cooling method for ball screw |
-
1991
- 1991-07-04 JP JP5180891U patent/JPH0516266U/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6062438A (en) * | 1983-09-12 | 1985-04-10 | Shiyouun Kosakusho:Kk | Cooling device for ball-and-screw shaft |
| JPS6377722A (en) * | 1986-09-19 | 1988-04-07 | Fanuc Ltd | Injection mechanism for injection molding machine |
| JPH02250746A (en) * | 1989-03-24 | 1990-10-08 | Okuma Mach Works Ltd | Cooling method for ball screw |
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| Date | Code | Title | Description |
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| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 19950124 |