JP2007030010A - Apparatus for compression forming of powder - Google Patents

Apparatus for compression forming of powder Download PDF

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JP2007030010A
JP2007030010A JP2005219585A JP2005219585A JP2007030010A JP 2007030010 A JP2007030010 A JP 2007030010A JP 2005219585 A JP2005219585 A JP 2005219585A JP 2005219585 A JP2005219585 A JP 2005219585A JP 2007030010 A JP2007030010 A JP 2007030010A
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powder
drive source
molding space
die
space
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Manabu Morioka
学 森岡
Yoshinari Sato
吉成 佐藤
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SHINEI DENKI SEISAKUSHO KK
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SHINEI DENKI SEISAKUSHO KK
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
    • B30B11/04—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space co-operating with a fixed mould

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  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for compression forming of powder, which apparatus can equalize the quantity of the powder to be supplied into the forming space of a die in a preliminary process before the compression forming, and also can form homogeneous and high density tablets by sufficiently releasing the air existing between particles of the powder supplied in the forming space. <P>SOLUTION: Driving sources 5, 6 for upper and lower punches 3, 4 capable of coming-in and coming-out with respect to the forming space 2a of a die 2 are composed of servomotors to be controllably driven by a control signal output from a control means 7. In addition, the particles of the powder are forcedly rocked by repeatedly moving the lower punch 4 up and down in the forming space 2a with controlled strokes and cycles in the preliminary process before the compression forming so as to sufficiently release the air existing between the particles of the powder. As a result, the density of the powder to be supplied into the forming space 2a is increased, and the compression property of the powder is improved. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、粉体を圧縮してタブレットを成形するのに好適な粉体の圧縮成形装置に関するものである。   The present invention relates to a powder compression molding apparatus suitable for molding a tablet by compressing powder.

従来、ダイの成形空間に供給した粉体をＡＣサーボモータによって駆動される上下のパンチによって圧縮してタブレットを成形する粉体の圧縮成形装置が提案されている（特許文献１）。   2. Description of the Related Art Conventionally, a powder compression molding apparatus has been proposed in which powder supplied to a molding space of a die is compressed by upper and lower punches driven by an AC servo motor to mold a tablet (Patent Document 1).

前記特許文献１に記載されている粉体の圧縮成形装置は、ＡＣサーボモータをコンピュータ制御することで、ダイの成形空間に充填した粉体を上下のパンチにより圧縮して所定の形状および成形密度を備えたタブレットを成形することができる。   In the powder compression molding apparatus described in Patent Document 1, the AC servo motor is controlled by a computer so that the powder filled in the molding space of the die is compressed by the upper and lower punches to obtain a predetermined shape and molding density. Can be formed into tablets.

特開平５−５７４９６号公報JP-A-5-57496

しかし、前記特許文献１に記載されている粉体の圧縮成形装置は、圧縮成形の前工程でダイの成形空間に充填される粉体の量を均一にする機能と、成形空間に充填された粉体の粒子間にある空気を充分に逃がして、粉体の圧縮特性を改善する機能を備えていない。すなわち、圧縮成形の前工程でダイの成形空間に充填される粉体の量が不均一であると、タブレットの成形密度にバラツキが生じてタブレットの品質を低下させる。また、成形空間に充填された粉体の粒子間にある空気の逃げが充分でないと、粉体を高密度で圧縮成形できないばかりか、圧縮力が取り除かれたとき、残留空気の膨張力によりクラックが発生して、タブレットの品質を低下させる欠点がある。   However, the powder compression molding apparatus described in Patent Document 1 has a function of making the amount of powder filled in the molding space of the die uniform in the pre-compression molding process and the molding space filled. It does not have a function of sufficiently releasing the air between the particles of the powder and improving the compression characteristics of the powder. That is, if the amount of powder filled in the molding space of the die in the pre-process of compression molding is not uniform, the tablet molding density varies and the tablet quality is lowered. In addition, if the air escape between the particles of the powder filled in the molding space is not sufficient, the powder cannot be compacted with high density, and when the compressive force is removed, cracks are caused by the expansion force of the residual air. Occurs, and there is a drawback of reducing the quality of the tablet.

本発明は、このような問題を解決するものであって、その目的とするところは、圧縮成形の前工程でダイの成形空間に充填される粉体の量を均一にするとともに、成形空間に充填された粉体の粒子間にある空気を充分に逃がすことにより、均一で高密度なタブレットを成形することができる粉体の圧縮成形装置を提供することにある。   The present invention solves such problems, and the object of the present invention is to make the amount of powder filled in the molding space of the die uniform in the pre-compression molding process and to form the molding space. An object of the present invention is to provide a powder compression molding apparatus capable of molding a uniform and high-density tablet by sufficiently releasing the air between the particles of the filled powder.

前記目的を達成するため、請求項１に記載の発明に係る粉体の圧縮成形装置は、成形空間を有するダイと、前記成形空間に出入り可能な上下のパンチと、これら上下のパンチを昇降させて前記成形空間に出し入れさせる駆動源と、この駆動源の駆動を制御する制御手段とを備えた粉体の圧縮成形装置において、前記駆動源がサーボモータによって構成されているとともに、前記制御手段からサーボモータに出力される制御信号により、前記下のパンチを圧縮成形の前工程で制御したストロークとサイクルによって前記成形空間内で昇降させるようにしてなることをと特徴としている。   In order to achieve the above object, a powder compression molding apparatus according to the first aspect of the present invention includes a die having a molding space, upper and lower punches capable of entering and exiting the molding space, and raising and lowering the upper and lower punches. In the powder compression molding apparatus provided with a drive source to be taken in and out of the molding space and a control means for controlling the drive of the drive source, the drive source is constituted by a servo motor, and the control means The lower punch is moved up and down in the molding space by the stroke and cycle controlled in the pre-compression molding process by the control signal output to the servo motor.

これによれば、サーボモータを駆動源としていることで、制御手段からサーボモータに出力される制御信号により、上下のパンチを制御したストロークとサイクルによって成形空間内で容易かつ正確に昇降させることができる。また、ダイの成形空間内に充填されている粉体には、下のパンチの上昇による突き上げ力と、下のパンチの下降により発生する降下力とを交互に繰り返して作用させることができる。このため、成形空間に充填された粉体の粒子を強制的に揺動して、成形空間に充填される粉体の量を均一化するように作用するとともに、粉体の粒子間にある空気を充分に逃がすことによって、成形空間に充填される粉体の密度が高められて、粉体の圧縮特性が改善されるので、高密度の圧縮成形が可能になり、かつ、圧縮力が取り除かれても、残留空気の膨張力によるクラックの発生を避けることができる。   According to this, since the servo motor is used as the drive source, the control signal output from the control means to the servo motor can be moved up and down easily and accurately in the molding space by the stroke and cycle in which the upper and lower punches are controlled. it can. In addition, a push-up force caused by the lower punch rising and a lowering force generated by the lower punch lowering can be alternately and repeatedly applied to the powder filled in the die forming space. For this reason, the particles of the powder filled in the molding space are forcibly swung so as to make the amount of the powder filled in the molding space uniform, and the air between the particles of the powder. Since the density of the powder filled in the molding space is increased and the compression characteristics of the powder are improved, high-density compression molding is possible and the compression force is removed. However, the generation of cracks due to the expansion force of the residual air can be avoided.

また、本発明は、上下のパンチと駆動源との間に、該駆動源によって回転するボールねじ軸と、ボールねじ軸に螺合して昇降する昇降コマとからなる昇降機構を介設することが望ましい。これによると、構造が簡単であるにもかかわらず、クリアランスの小さい高精度の昇降機構を構成できるので、制御手段によって制御されたサーボモータの駆動に基づいて、上下のパンチを正確なストロークで昇降させて、ダイの成形空間内で粉体を常時均一に圧縮することが可能になって、タブレットの均一な成形に寄与することができる。   Further, according to the present invention, an elevating mechanism including a ball screw shaft that is rotated by the drive source and an elevating piece that is raised and lowered by being screwed to the ball screw shaft is interposed between the upper and lower punches and the drive source. Is desirable. According to this, a high-precision lifting mechanism with a small clearance can be configured despite the simple structure, so that the upper and lower punches can be lifted and lowered with an accurate stroke based on the drive of the servo motor controlled by the control means. Thus, the powder can be always uniformly compressed in the molding space of the die, which can contribute to uniform molding of the tablet.

さらに、本発明は、粉体を自重による滑落でダイの成形空間に供給する粉体供給手段を設けることが望ましい。これによると、粉体供給用の動力を別途必要としない簡単な構造によって、粉体を過不足なく常時均一に自動的に供給することができる。   Furthermore, in the present invention, it is desirable to provide a powder supply means for supplying the powder to the molding space of the die by sliding under its own weight. According to this, it is possible to automatically and uniformly supply the powder constantly and without excess and deficiency with a simple structure that does not require any additional power for supplying the powder.

本発明によれば、圧縮成形の前工程でダイの成形空間に充填される粉体の量が均一化されることで、タブレットの成形密度を均一化して品質を高めることができる。また、粉体の粒子間にある空気を充分に逃がすことによって、高密度の圧縮成形を可能にし、かつ、圧縮力が取り除かれても残留空気の膨張力によるクラックの発生を避けることによっても、タブレットの品質を高めることができる。   According to the present invention, the amount of powder filled in the molding space of the die in the pre-process of compression molding is made uniform, so that the molding density of the tablet can be made uniform and the quality can be improved. In addition, by allowing sufficient air to escape between the particles of the powder, high-density compression molding is possible, and even if the compression force is removed, the occurrence of cracks due to the expansion force of the residual air can be avoided. The tablet quality can be improved.

以下、本発明の実施形態を図面に基づいて説明する。図１は、本発明の一実施形態を示す全体正面図、図２は、図１の側面図である。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an overall front view showing an embodiment of the present invention, and FIG. 2 is a side view of FIG.

図１および図２において、粉体の圧縮成形装置１は、上下方向に貫通した成形空間２ａを有するダイ２と、昇降動作によって成形空間２ａに出入り可能な上のパンチ３および下のパンチ４と、これら上下のパンチ３，４を昇降させて成形空間２ａに出し入れさせる上の駆動源５および下の駆動源６と、これら駆動源５，６の駆動を制御する制御手段７と、上のパンチ３と上の駆動源５との間に介設される上の昇降機構８と、下のパンチ４と下の駆動源６との間に介設される下の昇降機構９と、粉体供給手段１０とを備えている。   1 and 2, a powder compression molding apparatus 1 includes a die 2 having a molding space 2a penetrating in the vertical direction, an upper punch 3 and a lower punch 4 that can enter and exit the molding space 2a by a lifting operation. The upper drive source 5 and the lower drive source 6 for moving the upper and lower punches 3 and 4 up and down to be taken in and out of the molding space 2a, the control means 7 for controlling the drive of these drive sources 5 and 6, and the upper punch 3 and an upper drive mechanism 5 interposed between the upper drive source 5, a lower lift mechanism 9 interposed between the lower punch 4 and the lower drive source 6, and powder supply Means 10.

ダイ２は、鉛直方向の軸線Ｃを有して架台１１に着脱可能に固定されており、前記軸線Ｃ上でダイ２を挟んで上のパンチ３と下のパンチ４が対向して配置されている。   The die 2 has a vertical axis C and is detachably fixed to the gantry 11, and the upper punch 3 and the lower punch 4 are arranged on the axis C with the die 2 sandwiched therebetween. Yes.

上の駆動源５は上のパンチ３を駆動し、下の駆動源６は下のパンチ４駆動するためのもので、それぞれはＡＣサーボモータによって構成されており、上の駆動源５は、駆動プーリ１２ａ，従動プーリ１２ｂおよび駆動プーリ１２ａと従動プーリ１２ｂに掛け渡されたタイミングベルト１２ｃからなる動力伝達機構１２を介して上の昇降機構８に連結され、下の駆動源６は、前記と同様の動力伝達機構１２を介して下の昇降機構９に連結されている。   The upper drive source 5 drives the upper punch 3, and the lower drive source 6 drives the lower punch 4. Each of the upper drive sources 5 is constituted by an AC servo motor, and the upper drive source 5 is driven. The lower drive source 6 is connected to the upper elevating mechanism 8 through a power transmission mechanism 12 including a pulley 12a, a driven pulley 12b, a driving pulley 12a, and a timing belt 12c stretched over the driven pulley 12b. Is connected to the lower lifting mechanism 9 through the power transmission mechanism 12.

制御手段７は、オペレータによって供給された作動プログラムに基づいて、ＡＣサーボモータからなる上下の駆動源５，６の駆動を制御し、上下の駆動源５，６の駆動が制御されることで、上下のパンチ３，４の作動が制御されるように構成されている。   The control means 7 controls the drive of the upper and lower drive sources 5 and 6 made of an AC servo motor based on the operation program supplied by the operator, and the drive of the upper and lower drive sources 5 and 6 is controlled. The operation of the upper and lower punches 3 and 4 is controlled.

上の昇降機構８は、前記軸線Ｃ上に位置して従動プーリ１２ｂとともに回転する鉛直方向のボールねじ軸８ａと、このボールねじ軸８ａに螺合して昇降する昇降コマ８ｂとを備え、昇降コマ８ｂに取付けた上のラム１３の下端部に上のパンチ３が着脱可能、かつ下向きの姿勢で取付けられている。また、下の昇降機構９は、前記軸線Ｃ上に位置して従動プーリ１２ｂとともに回転する鉛直方向のボールねじ軸９ａと、このボールねじ軸９ａに螺合して昇降する昇降コマ９ｂとを備え、昇降コマ９ｂに取付けた下のラム１４の上端部に下のパンチ４が着脱可能、かつ上向きの姿勢で取付けられている。   The upper elevating mechanism 8 includes a vertical ball screw shaft 8a that is positioned on the axis C and rotates with the driven pulley 12b, and an elevating piece 8b that engages with the ball screw shaft 8a to move up and down. The upper punch 3 is detachably attached to the lower end portion of the upper ram 13 attached to the top 8b and attached in a downward posture. The lower elevating mechanism 9 includes a vertical ball screw shaft 9a that is positioned on the axis C and rotates with the driven pulley 12b, and an elevating piece 9b that is screwed to the ball screw shaft 9a to move up and down. The lower punch 4 is detachably attached to the upper end portion of the lower ram 14 attached to the elevating piece 9b and is attached in an upward posture.

粉体供給手段１０は、漏斗型ホッパーからなる粉体貯留タンク１０ａと、フレキシブルチューブ１０ｂとを備え、フレキシブルチューブ１０ｂは、粉体貯留タンク１０ａの下端部に形成されている粉体滑落口１０ｃと粉体配給兼成形品移動ボックス１５の内部とを連通させている。なお、粉体配給兼成形品移動ボックス１５は、架台１１の上面に幅方向（矢印Ｗ１，Ｗ２方向）の移動を自在に架台１１に載置されており、その内部は、図３に示すように、第１の下向き空間１５ａと、この第１の下向き空間１５ａの幅Ｗ１方向に隣接して設けた第２の下向き空間１５ｂとを備え、フレキシブルチューブ１０ｂの先端開口部は第１の下向き空間１５ａに臨んでいる。   The powder supply means 10 includes a powder storage tank 10a formed of a funnel hopper and a flexible tube 10b. The flexible tube 10b includes a powder sliding port 10c formed at the lower end of the powder storage tank 10a. The powder distribution / molded product moving box 15 is communicated with the inside. The powder distribution / molded product moving box 15 is placed on the gantry 11 so as to be freely movable in the width direction (arrows W1 and W2 directions) on the upper surface of the gantry 11, and its interior is as shown in FIG. Are provided with a first downward space 15a and a second downward space 15b provided adjacent to the width W1 direction of the first downward space 15a, and the distal end opening of the flexible tube 10b is the first downward space. It faces 15a.

粉体配給兼成形品移動ボックス１５は、ＡＣサーボモータからなる駆動源１６によって幅方向（矢印Ｗ１，Ｗ２方向）に移動するようになっている。たとえば、駆動源１６の出力軸（図示省略）に取付けたピニオン（図示省略）を幅方向（矢印Ｗ１，Ｗ２方向）にのびて同方向に移動可能なラック（図示省略）と噛み合わせ、このラックと粉体配給兼成形品移動ボックス１５とを連結部材１７によって互いに連結することで、駆動源１６の正逆方向の回転に追従して、粉体配給兼成形品移動ボックス１５を幅方向（矢印Ｗ１，Ｗ２方向）に進退させることができる。前記ＡＣサーボモータからなる駆動源１６は、オペレータによって制御手段７に供給された作動プログラムに基づいて制御された回転角で正逆方向に回転駆動する。   The powder distribution and molded product moving box 15 is moved in the width direction (arrows W1 and W2 directions) by a drive source 16 comprising an AC servomotor. For example, a pinion (not shown) attached to an output shaft (not shown) of the drive source 16 is meshed with a rack (not shown) that extends in the width direction (arrows W1 and W2) and can move in the same direction. And the powder delivery / molded product moving box 15 are connected to each other by the connecting member 17, and the powder delivery / molded product moving box 15 is moved in the width direction (arrow) following the rotation of the drive source 16 in the forward and reverse directions. (W1, W2 direction). The drive source 16 composed of the AC servo motor is rotationally driven in forward and reverse directions at a rotation angle controlled based on an operation program supplied to the control means 7 by the operator.

つぎに前記構成の作動について説明する。制御手段７は、オペレータによって供給された作動プログラムに基づいてＡＣサーボモータからなる上の駆動源５に制御信号を出力して、上の駆動源５を制御された回転角で正逆方向に回転駆動する。これにより、上の駆動源５の駆動力は、動力伝達機構１２を介して上の昇降機構８に伝達され、その昇降コマ８ｂと上のラム１３および上のパンチ３を昇降させる。また、制御手段７は、オペレータによって供給された作動プログラムに基づいてＡＣサーボモータからなる下の駆動源６に制御信号を出力して、下の駆動源６を制御された回転角で正逆方向に回転駆動する。これにより、下の駆動源６の駆動力は、動力伝達機構１２を介して下の昇降機構９に伝達され、その昇降コマ９ｂと下のラム１４および下のパンチ４を昇降させる。   Next, the operation of the above configuration will be described. The control means 7 outputs a control signal to the upper drive source 5 composed of an AC servo motor based on the operation program supplied by the operator, and rotates the upper drive source 5 in the forward and reverse directions at a controlled rotation angle. To drive. Thereby, the driving force of the upper drive source 5 is transmitted to the upper elevating mechanism 8 through the power transmission mechanism 12, and the elevating piece 8b, the upper ram 13 and the upper punch 3 are moved up and down. Further, the control means 7 outputs a control signal to the lower drive source 6 composed of an AC servo motor based on the operation program supplied by the operator, so that the lower drive source 6 is rotated in the forward and reverse directions at a controlled rotation angle. To rotate. As a result, the driving force of the lower drive source 6 is transmitted to the lower lifting mechanism 9 via the power transmission mechanism 12 to lift and lower the lifting and lowering piece 9b, the lower ram 14 and the lower punch 4.

今、粉体配給兼成形品移動ボックス１５と上下のパンチ３，３が図４（ａ）の位置にあるとする。このとき、粉体供給手段１０（図１、図２参照）の粉体貯留タンク１０ａに貯留されている粉体は、その自重によりフレキシブルチューブ１０ｂ内を滑落して、粉体配給兼成形品移動ボックス１５の第１の下向き空間１５ａ内に自動的に供給されている。つまり、粉体供給用の動力を別途必要としない簡単な構造によって、粉体を過不足なく常時均一に自動的に第１の下向き空間１５ａ内に供給することができる。   Assume that the powder distribution / molded product moving box 15 and the upper and lower punches 3 and 3 are at the position shown in FIG. At this time, the powder stored in the powder storage tank 10a of the powder supply means 10 (see FIGS. 1 and 2) slides down in the flexible tube 10b due to its own weight, and the powder is distributed and the molded product is moved. It is automatically supplied into the first downward space 15a of the box 15. That is, with a simple structure that does not require power for supplying powder separately, powder can be supplied automatically and uniformly into the first downward space 15a without any excess or deficiency.

一方、後述する理由によって、ダイ２の成形空間２ａにおける下のパンチ４よりも上側の領域には、すでに粉体が充填されている。ここで、下のパンチ４を制御したストロークとサイクルによって成形空間２ａ内で昇降させる（経時矢印ｘ参照）。このように下のパンチ４が昇降することで、成形空間２ａ内に充填されている粉体には、下のパンチ４の上昇による突き上げ力と、下のパンチ４の下降により発生する降下力とを交互に繰り返して作用させることができる。このため、成形空間２ａに充填された粉体の粒子を強制的に揺動して、図４（ｂ）では成形空間２ａに充填される粉体の量を均一化することができる。また、粉体の粒子を強制的に揺動させることで、粉体の粒子間にある空気を充分に逃がすことができる。したがって、粉体は成形空間２ａに高密度で充填されて、粉体の圧縮特性が改善されることになる。   On the other hand, the powder is already filled in the region above the lower punch 4 in the molding space 2a of the die 2 for the reason described later. Here, the lower punch 4 is moved up and down in the molding space 2a by the controlled stroke and cycle (see the time-dependent arrow x). As the lower punch 4 moves up and down in this way, the powder filled in the molding space 2a has a push-up force due to the lower punch 4 rising and a lowering force generated by the lower punch 4 lowering. Can be made to act alternately. For this reason, the powder particles filled in the molding space 2a can be forcibly swung to make the amount of the powder filled in the molding space 2a uniform in FIG. 4B. Further, by forcibly swinging the powder particles, the air between the powder particles can be sufficiently released. Therefore, the powder is filled in the molding space 2a at a high density, and the compression characteristics of the powder are improved.

成形空間２ａ内での下のパンチ４の昇降が終了すると、下のパンチ４は図４（ｂ）のようにダイ内の上死点で停止する。このとき、余剰粉ａはダイ２の上部で盛り上がって堆積している。ここで粉体配給兼成形品移動ボックス１５を図４（ｃ）の位置に移動させると、この移動に伴って、余剰粉ａは粉体配給兼成形品移動ボックス１５の下端に設けた摺り切り片１５ｃに押されてダイ２の上部から側方に退避するとともに、成形空間２ａに充填された粉体の上面はダイ２の上面と面一な状態に摺り切られる。   When the elevation of the lower punch 4 in the molding space 2a is completed, the lower punch 4 stops at the top dead center in the die as shown in FIG. At this time, the surplus powder a rises and accumulates at the top of the die 2. When the powder distribution / molded product moving box 15 is moved to the position shown in FIG. 4C, the excess powder a is scraped off at the lower end of the powder distribution / molded product moving box 15 along with the movement. The upper surface of the powder filled in the molding space 2 a is slid to be flush with the upper surface of the die 2 while being pushed by the piece 15 c and retracted laterally from the upper portion of the die 2.

つぎに上のパンチ３を図４（ｄ）のように下降させて、上下のパンチ３，４で成形空間２ａ内の粉体を圧縮してタブレット１８を成形する。タブレット１８の成形が終了すると、上下のパンチ３，４をそれぞれ上昇させて、図４（ｅ）のように、下のパンチ４でタブレット１８をダイ２の成形空間２ａから突き出す。   Next, the upper punch 3 is lowered as shown in FIG. 4 (d), and the powder in the molding space 2 a is compressed by the upper and lower punches 3, 4 to mold the tablet 18. When the molding of the tablet 18 is completed, the upper and lower punches 3 and 4 are raised, and the tablet 18 is ejected from the molding space 2a of the die 2 with the lower punch 4 as shown in FIG.

つぎに、粉体配給兼成形品移動ボックス１５を図４（ｆ）の位置に移動させると、この移動に伴ってタブレット１８は粉体配給兼成形品移動ボックス１５の下端部に押されてダイ２の成形空間２ａから退避し、さらに粉体配給兼成形品移動ボックス１５が図４（ｇ）の位置まで移動することで、タブレット１８はダイ２の側方に移動して適宜回収される。   Next, when the powder delivery / molded product moving box 15 is moved to the position shown in FIG. 4 (f), the tablet 18 is pushed by the lower end of the powder delivery / molded product moving box 15 along with this movement. Then, the tablet 18 moves to the side of the die 2 and is appropriately collected by moving away from the molding space 2a of No. 2 and further moving the powder distribution / molded product moving box 15 to the position shown in FIG.

一方、粉体配給兼成形品移動ボックス１５が図４（ｅ）の位置から図４（ｆ）の位置に移動して、タブレット１８がダイ２の成形空間２ａから退避した時点で下のパンチ４を下降させる。したがって、粉体配給兼成形品移動ボックス１５が図４（ｆ）の位置から図４（ｇ）の位置に移動することで、余剰粉ａは第１の下向き空間１５ａと第２の下向き空間１５ｂとの境界部１５ｄにより側方に押されて、ダイ２の成形空間２ａにおける下のパンチ４よりも上側の領域に落とし込まれる。さらに粉体配給兼成形品移動ボックス１５が図４（ｈ）の位置に移動すると、第１の下向き空間１５ａ内にある粉体は、図４（ｈ）および図４（ａ）に示すように、ダイ２の成形空間２ａにおける下のパンチ４よりも上側の領域、詳しくは、下のパンチ４よりも上側の領域に落とし込まれている余剰粉ａよりも上側の領域に充填され、以後は前述の作動が連続して繰り返されることによって、タブレット１８を連続して成形して回収することができる。   On the other hand, when the powder distribution / molded product moving box 15 is moved from the position of FIG. 4 (e) to the position of FIG. 4 (f) and the tablet 18 is retreated from the molding space 2 a of the die 2, the lower punch 4. Is lowered. Accordingly, the powder distribution / molded product moving box 15 moves from the position shown in FIG. 4 (f) to the position shown in FIG. 4 (g), so that the surplus powder a is contained in the first downward space 15a and the second downward space 15b. Is pushed to the side by the boundary portion 15d and is dropped into a region above the lower punch 4 in the molding space 2a of the die 2. Further, when the powder distribution / molded product moving box 15 is moved to the position shown in FIG. 4 (h), the powder in the first downward space 15a is as shown in FIGS. 4 (h) and 4 (a). The region above the lower punch 4 in the molding space 2a of the die 2, more specifically, the region above the surplus powder a dropped into the region above the lower punch 4 is filled, and thereafter By repeating the above-described operation continuously, the tablet 18 can be continuously molded and collected.

このように、ＡＣサーボモータによって上下の駆動源５，６を構成し、制御手段７からサーボモータに出力される制御信号により、上下のパンチ４を制御したストロークとサイクルによってダイ２の成形空間２ａ内で容易かつ正確に昇降させることができる。また、ダイ２の成形空間２ａ内に充填されている粉体には、下のパンチ４の上昇による突き上げ力と、下のパンチ４の下降により発生する降下力とを交互に繰り返して作用させることができるので、成形空間２ａに充填された粉体の粒子を強制的に揺動して、成形空間２ａに充填される粉体の量を均一化するとともに、粉体の粒子間にある空気を充分に逃がすことによって、成形空間２ａに充填される粉体の密度が高められて、粉体の圧縮特性が改善され、高密度の圧縮成形が可能になり、かつ、圧縮力が取り除かれても、残留空気の膨張力によるクラックの発生を避けることができる。したがって、高品質のタブレットの成形が可能になる。   In this way, the upper and lower drive sources 5 and 6 are constituted by the AC servo motor, and the molding space 2a of the die 2 is determined by the stroke and cycle in which the upper and lower punches 4 are controlled by the control signal output from the control means 7 to the servo motor. Can be lifted and lowered easily and accurately. Further, the powder filled in the molding space 2a of the die 2 is caused to alternately and repeatedly act as a push-up force due to the lower punch 4 rising and a lowering force generated due to the lower punch 4 lowering. Therefore, the powder particles filled in the molding space 2a are forcibly swung to uniformize the amount of the powder filled in the molding space 2a, and the air between the powder particles can be reduced. By sufficiently escaping, the density of the powder filled in the molding space 2a is increased, the compression characteristics of the powder are improved, high density compression molding is possible, and the compression force is removed. The occurrence of cracks due to the expansion force of residual air can be avoided. Therefore, it is possible to mold a high quality tablet.

また、上のパンチ３と上の駆動源５との間に、駆動源５によって回転するボールねじ軸８ａと、ボールねじ軸８ａに螺合して昇降する昇降コマ８ｂとからなる昇降機構８を介設し、下のパンチ４と下の駆動源６との間に、駆動源６によって回転するボールねじ軸９ａと、ボールねじ軸９ａに螺合して昇降する昇降コマ９ｂとからなる昇降機構９を介設しているので、構造が簡単であるにもかかわらず、クリアランスの小さい高精度の昇降機構８，９を構成できる。このため、制御手段７によって制御された上下の駆動源５，６の駆動に基づいて、上下のパンチ３，４を正確なストロークで昇降させて、ダイ２の成形空間２ａ内で粉体を常時均一に圧縮することが可能になって、タブレット１８の均一な成形に寄与することができる。   Further, an elevating mechanism 8 including a ball screw shaft 8a rotated by the drive source 5 and an elevating piece 8b which is engaged with the ball screw shaft 8a to move up and down is provided between the upper punch 3 and the upper drive source 5. An elevating mechanism comprising a ball screw shaft 9a that is rotated by the drive source 6 and an elevating piece 9b that is engaged with the ball screw shaft 9a and moves up and down between the lower punch 4 and the lower drive source 6. 9 is interposed, it is possible to construct the high-precision elevating mechanisms 8 and 9 having a small clearance despite the simple structure. Therefore, on the basis of the driving of the upper and lower drive sources 5 and 6 controlled by the control means 7, the upper and lower punches 3 and 4 are moved up and down with an accurate stroke so that the powder is always in the molding space 2a of the die 2. It becomes possible to compress uniformly, and it can contribute to the uniform shaping | molding of the tablet 18. FIG.

本発明の一実施形態を示す全体正面図である。It is a whole front view showing one embodiment of the present invention. 図１の側面図である。It is a side view of FIG. 粉体配給兼成形品移動ボックスの一実施形態を拡大して示す縦断正面図である。It is a vertical front view which expands and shows one Embodiment of a powder distribution and molded article movement box. （ａ）〜（ｈ）は作動の説明図である。(A)-(h) is explanatory drawing of an action | operation.

符号の説明Explanation of symbols

１ 粉体の圧縮成形装置
２ ダイ
２ａ 成形空間
３ 上のパンチ
４ 下のパンチ
５ 上のサーボモータ（上の駆動源）
６ 下のサーボモータ（下の駆動源）
７ 制御手段
８ 上の昇降機構（昇降機構）
９ 下の昇降機構（昇降機構）
１０ 粉体供給手段 DESCRIPTION OF SYMBOLS 1 Powder compression molding apparatus 2 Die 2a Molding space 3 Upper punch 4 Lower punch 5 Servo motor (upper drive source)
6 Lower servo motor (lower drive source)
7 Control means 8 Elevating mechanism (elevating mechanism)
9 Lower lift mechanism (lift mechanism)
10 Powder supply means

Claims (3)

成形空間を有するダイと、前記成形空間に出入り可能な上下のパンチと、これら上下のパンチを昇降させて前記成形空間に出し入れさせる駆動源と、この駆動源の駆動を制御する制御手段とを備えた粉体の圧縮成形装置において、
前記駆動源がサーボモータによって構成されているとともに、前記制御手段からサーボモータに出力される制御信号により、前記下のパンチを圧縮成形の前工程で制御したストロークとサイクルによって前記成形空間内で昇降させるようにしてなることをと特徴とする粉体の圧縮成形装置。 A die having a molding space, upper and lower punches that can enter and leave the molding space, a drive source that moves the upper and lower punches up and down and puts in and out of the molding space, and a control unit that controls the drive of the drive source. In powder compression molding equipment,
The drive source is constituted by a servo motor, and the lower punch is moved up and down in the molding space by a stroke and cycle controlled in the pre-compression process by a control signal output from the control means to the servo motor. A powder compression molding apparatus characterized by comprising 請求項１に記載の粉体の圧縮成形装置において
前記上下のパンチと駆動源との間に、該駆動源によって回転するボールねじ軸と、ボールねじ軸に螺合して昇降する昇降コマとからなる昇降機構が介設されていることを特徴とする粉体の圧縮成形装置。 2. The powder compression molding apparatus according to claim 1, wherein a ball screw shaft that is rotated by the drive source and a lift piece that is screwed up and down by being engaged with the ball screw shaft between the upper and lower punches and the drive source. A powder compression molding apparatus characterized in that an elevating mechanism is provided. 請求項１または請求項２に記載の粉体の圧縮成形装置において
前記粉体を自重による滑落で前記ダイの成形空間に供給する粉体供給手段が設けられていることを特徴とする粉体の圧縮成形装置。 The powder compression molding apparatus according to claim 1 or 2, further comprising powder supply means for supplying the powder to the molding space of the die by sliding down due to its own weight. Compression molding device.
JP2005219585A 2005-07-28 2005-07-28 Apparatus for compression forming of powder Pending JP2007030010A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103273679A (en) * 2013-06-14 2013-09-04 东莞市宏祥机械设备有限公司 Liquid powder forming machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103273679A (en) * 2013-06-14 2013-09-04 东莞市宏祥机械设备有限公司 Liquid powder forming machine

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