JP2013252527A - Powder feed device of powder molding machine - Google Patents

Powder feed device of powder molding machine Download PDF

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JP2013252527A
JP2013252527A JP2012127997A JP2012127997A JP2013252527A JP 2013252527 A JP2013252527 A JP 2013252527A JP 2012127997 A JP2012127997 A JP 2012127997A JP 2012127997 A JP2012127997 A JP 2012127997A JP 2013252527 A JP2013252527 A JP 2013252527A
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powder
scraper
molding machine
cavity
die
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JP5915954B2 (en
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Kazuhiro Okada
和浩 岡田
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Sumitomo Electric Sintered Alloy Ltd
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Abstract

PROBLEM TO BE SOLVED: To form sintered parts with a less number of segmentation of a lower punch when forming the sintered parts in which recessed parts released at an outer circumference are located at a part of end faces by a powder molding machine and, at the same time, to suppress density difference in forming to be small.SOLUTION: A powder feed device includes a powder feed box 11 which feeds a raw powder material into a cavity 9 of a die of powder molding machine, a powder scrape 12 which scrapes out a part of the fed raw powder material, and a driving mechanism 13 which moves the powder scrape 12 in a direction of right angles against advancing and retreating directions of the powder feed box 11. The powder scrape 12 has a hole 12a disposed on the cavity 9 at the tip end and is slidably inserted in grooves 16, 17 in which the powder scrape 12 is formed between a die and a die plate, and when the powder feed box 11 retreats to a position away from the upper part of the powder scrape 12, the powder scrape 12 is retreated so that a part of powder fed in the cavity 9 can be raked to the outside.

Description

この発明は、焼結部品の製造に利用される粉末成形機の給粉装置、詳しくは、外周に解放した凹部が端面にあってその部分で軸方向寸法（厚み）が小さくなっている焼結部品を、各部に大きな密度差を生じさせずに成形することを可能ならしめる給粉装置に関する。   The present invention relates to a powder feeder for a powder molding machine used for the manufacture of sintered parts, and more particularly, sintering in which a concave portion released on the outer periphery is located on an end surface and an axial dimension (thickness) is reduced at that portion. The present invention relates to a powder feeding apparatus that makes it possible to mold a part without causing a large density difference in each part.

焼結部品は、原料粉末を粉末成形機で加圧、成形し、得られた圧粉体（成形体）を焼結して作られる。その焼結部品の一例を図５及び図６に示す。図示の焼結部品２０は、円盤上の本体部２１と、その本体部２１の下面中心に垂下して設けられる軸穴２２を備えたボス部２３を有する。本体部２１の下面（裏面）にはボス部２３を取り巻く円形溝２４が形成されており、また、本体部２１の上面（表面）には、１８０°回転した位置に、本体部２１の外周に解放した中心対象形状の凹部２５が設けられている。   The sintered part is made by pressing and forming the raw material powder with a powder molding machine and sintering the obtained green compact (molded body). An example of the sintered part is shown in FIGS. The illustrated sintered component 20 has a main body 21 on a disk and a boss 23 having a shaft hole 22 provided to hang down from the center of the lower surface of the main body 21. A circular groove 24 surrounding the boss portion 23 is formed on the lower surface (back surface) of the main body portion 21, and the upper surface (front surface) of the main body portion 21 is positioned 180 ° rotated on the outer periphery of the main body portion 21. A recessed portion 25 having a released central object shape is provided.

この焼結部品２０は、金型を用いて成形される。図示の焼結部品２０の成形で考えられる金型の概要を図７に示す。   The sintered component 20 is molded using a mold. FIG. 7 shows an outline of a mold that can be considered for forming the illustrated sintered component 20.

この金型は、ダイ１と、３つの下パンチ２−１〜２−３と、コアロッド３（これは軸穴２２の無い部品の成形では不要）と、上パンチ４を組み合わせて構成されている。ダイ１は、ダイプレート５に支持されている。ダイプレート５は、昇降可能であり、ガイドロッド（図示せず）を介してヨーク（これも図示せず）に連結されている。 This die is configured by combining a die 1, three lower punches 2 −1 to 2 −3 , a core rod 3 (which is not necessary for molding a part without the shaft hole 22), and an upper punch 4. . The die 1 is supported on the die plate 5. The die plate 5 can be moved up and down, and is connected to a yoke (also not shown) via a guide rod (not shown).

図中６は、ダイ１と上パンチ４を位置決めするガイドポストである。そのガイドポスト６の一端はダイプレート５に固定され、他端側は、上パンチプレート７に設けられるガイドブッシュ８にスライド自在に挿通される。   In the figure, 6 is a guide post for positioning the die 1 and the upper punch 4. One end of the guide post 6 is fixed to the die plate 5, and the other end side is slidably inserted into a guide bush 8 provided on the upper punch plate 7.

このような金型を有する粉末成形機用の給粉装置が、例えば、下記特許文献１に開示されている。同文献に記載された給粉装置は、給粉ボックス（フィーダ）の前部に掻き板を設けており、金型のキャビティに投入される粉末をその掻き板で擦り切るようにしている。   A powder feeder for a powder molding machine having such a mold is disclosed in, for example, Patent Document 1 below. The powder feeding apparatus described in this document is provided with a scraper at the front of a powder feeding box (feeder), and the powder put into the mold cavity is scraped off by the scraper.

特開平１１−２６７８９１号公報Japanese Patent Laid-Open No. 11-267891

図７の金型を用いた成形では、下１パンチ２−１、下２パンチ２−２、下３パンチ２−３を給粉時と成形時とで異ならせることでそれらの下パンチによって加圧される部分の粉末圧縮比を極力均一化する方法が採られる。 In the molding using the mold of FIG. 7, pressurized by the lower 1 punch 2 -1, under 2 punch 2 -2, under 3 their lower punch by varying the punch 2 -3 during the powder feeding and at the time of molding A method is adopted in which the powder compression ratio of the pressed portion is made as uniform as possible.

ところが、例えば、図５に示した焼結部品２０は、上面の一部に凹部２５があることから、キャビティ９に対する粉末投入時に図７の鎖線で囲った部分に原料粉末Ｐが過剰に投入され、プレス成形して得られる部品の各部の成形密度に大きな差が生じてしまう。その密度差の大きい部品は、焼結時や使用時に亀裂や変形が生じやすく、不良品として扱われる。   However, for example, since the sintered part 20 shown in FIG. 5 has the recess 25 in a part of the upper surface, the raw material powder P is excessively introduced into the portion surrounded by the chain line in FIG. A large difference occurs in the molding density of each part of the part obtained by press molding. Parts having a large density difference are easily cracked or deformed during sintering or use, and are treated as defective products.

なお、その密度差の解消策として、下１パンチ２−１と下２パンチ２−２の凹部２５に対応した箇所を分割してその部分に投入される粉末の量を別途調整する方法が考えられるが、下１パンチ２−１や下２パンチ２−２が肉厚の制限されたパンチとなる場合には、強度上の問題があって凹部２５に対応した箇所の分割が許容されない。 As a measure for eliminating the density difference, a method of dividing the portion corresponding to the concave portion 25 of the lower 1 punch 2-1 and the lower 2 punch 2-2 and separately adjusting the amount of powder charged into the portion is considered. However, when the lower 1 punch 2-1 and the lower 2 punch 2-2 are punches with a limited thickness, there is a problem in strength, and the division corresponding to the recess 25 is not allowed.

また、その分割が仮に許容されたとしても、パンチの分割数が多くなればなるほど粉末成形機の動作や構造が複雑になるため、安定した成形が望めない。   Even if the division is allowed, the more the number of punch divisions, the more complicated the operation and structure of the powder molding machine, and stable molding cannot be expected.

なお、前記特許文献１に開示された給粉装置は、キャビティに投入された粉末を擦り切る掻き板を備えているが、この給粉装置の掻き板はキャビティに投入された粉末を部分に掻き取れるものではない。従って、特許文献１の構造では、図５に示すような焼結部品については、成形密度の均一化の要求に応えられない。   The powder feeder disclosed in Patent Document 1 includes a scraper that scrapes off the powder charged into the cavity. The scraper of the powder feeder scrapes the powder charged into the cavity into portions. It cannot be taken. Therefore, in the structure of Patent Document 1, the sintered part as shown in FIG. 5 cannot meet the demand for uniform forming density.

この発明は、外周に解放した凹部が端面（例えば上面）の一部にある焼結部品（圧粉体）の成形を、下パンチの分割数を少なくして行えるようにし、同時に、成形の密度差も小さく抑えられるようにすることを課題としている。   This invention makes it possible to form a sintered part (compact) with a recessed portion released on the outer periphery on a part of the end face (for example, the upper surface) by reducing the number of divisions of the lower punch, and at the same time, forming density The problem is to make the difference small.

上記の課題を解決するため、この発明においては、粉末成形機の給粉装置を以下の通りに構成した。
即ち、ダイ及びダイプレート上を進退して前進位置で粉末成形機の金型のキャビティに原料粉末を投入する給粉ボックスと、キャビティに投入された原料粉末の一部を掻き出す粉末掻きと、その粉末掻きを前記給粉ボックスの進退方向と直角向きに進退させる駆動機構を有し、
前記粉末掻きは、前進位置で前記キャビティ上に配置される穴を先端に有し、この粉末掻きが前記ダイとダイプレートの上面に形成された溝にスライド可能に挿入され、前記給粉ボックスが前記粉末掻きの上方から外れる位置まで後退したときに前記粉末掻きが前記駆動機構に駆動されて後退してキャビティに投入された粉末の一部（先端の穴に充填された領域）を外部に掻き出すようにした。 In order to solve the above-described problems, in the present invention, the powder feeder of the powder molding machine is configured as follows.
That is, a powder feeding box for feeding the raw material powder into the mold cavity of the powder molding machine in the forward position by moving back and forth on the die and the die plate; A drive mechanism that advances and retracts the powder scraper in a direction perpendicular to the advance and retreat direction of the powder feeding box;
The powder scraper has a hole disposed on the cavity at the forward position at the tip, and this powder scraper is slidably inserted into a groove formed on the upper surface of the die and the die plate, and the powder feeding box is When the powder scraper is retracted to a position where it is removed from above the powder scraper, the powder scraper is driven by the drive mechanism and retracts to scrape a part of the powder (region filled in the hole at the tip) to the outside. I did it.

この給粉装置は、粉末掻きを前進位置に保持した状態でキャビティに粉末を投入する。粉末掻きはキャビティ上に配置される穴を先端に有しているので、キャビティに対する粉末の流入が粉末掻きによって妨げられることはない。   This powder feeding apparatus throws powder into the cavity with the powder scraper held in the forward position. Since the powder scraper has a hole disposed on the tip at the tip, the powder inflow into the cavity is not hindered by the powder scraping.

粉末掻きを前進位置に保持した状態で給粉を行うと、粉末掻きの先端の穴にも粉末が投入される。その穴に充填された分は余剰投入量であり、粉末掻きを後退させることでその余剰分を掻き出す。その掻き出しは、余剰分を先端の穴に取り込んでいるので、確実に、しかも、周囲の粉末を著しく崩したりせずに行うことができる。   When powdering is performed in a state where the powder scraper is held at the forward position, the powder is also put into the hole at the tip of the powder scraper. The amount filled in the hole is the surplus input amount, and the surplus is scraped by retreating the powder scraping. The scraping can be performed surely and without significantly disrupting the surrounding powder because the excess is taken into the hole at the tip.

なお、粉末掻きは、成形が完了してキャビティから圧粉体が払い出された後に粉末成形機がリセットされると再び前進位置に戻される。そのときに、前回の成形で掻き出された粉末（粉末掻きの先端の穴に取り込まれている粉末）は、次回成形での給粉量の一部としてキャビティに投入される。   The powder scraping is returned to the advanced position again when the powder molding machine is reset after the compacting is completed and the green compact is discharged from the cavity. At that time, the powder scraped by the previous molding (powder taken into the hole at the tip of the powder scraping) is put into the cavity as a part of the amount of powder supplied in the next molding.

この給粉装置の好ましい形態を以下に列挙する。
（１）前記給粉ボックスと前記粉末掻きとの間に、給粉ボックスの後進運動を軸直角向きの直線運動に変換して前記粉末掻きに伝達する連動機構を設け、その連動機構を前記駆動機構となして粉末掻きを動作させるもの。
（２）上記連動機構を、給粉ボックスに連結されて給粉ボックスとともに進退するカムと、前記粉末掻きに設けられて前記カムによって粉末掻きが後退する方向に押し動かされるカムフォロアと、粉末掻きを前進方向に付勢するばねを組み合わせて構成したもの。
（３）前記粉末掻きを２組設け、その２組の粉末掻きを平面視でキャビティの左右に対向して配置したもの。
（４）前記粉末掻きが前進位置にあることと後退位置にあることを検出する位置センサを設け、それ等の位置センサからの検出信号を粉末成形機の動作の制御に用いるようにしたもの。 Preferred forms of this powder feeding device are listed below.
(1) An interlocking mechanism is provided between the powdering box and the powder scraper to convert the backward motion of the powdering box into a linear motion perpendicular to the axis and transmit the linear motion to the powder scraper, and the interlocking mechanism is driven. Acts as a mechanism to operate powder scraping.
(2) A cam that is connected to the powder feeding box and moves forward and backward together with the powder feeding box, a cam follower that is provided on the powder scraper and is moved in a direction in which the powder scraping moves backward by the cam, and powder scraping. A combination of springs that urge in the forward direction.
(3) Two sets of the powder scraping are provided, and the two sets of powder scraping are arranged facing the left and right sides of the cavity in plan view.
(4) A position sensor for detecting whether the powder scraping is in the forward position or the backward position is provided, and detection signals from these position sensors are used for controlling the operation of the powder molding machine.

この発明の給粉装置は、給粉ボックスの進退方向と直交する向きに進退する粉末掻きを備えており、その粉末掻きでキャビティに投入された粉末の一部を掻き出して焼結部品の端面の凹部に対応した位置での粉末の過剰投入をなくすことができる。   The powder feeding apparatus of the present invention includes a powder scraper that advances and retreats in a direction orthogonal to the advancing and retreating direction of the powder feeding box, and scrapes a part of the powder charged into the cavity by the powder scraping to the end surface of the sintered part. It is possible to eliminate the excessive charging of the powder at the position corresponding to the recess.

そのために、パンチを分割せずに得られる部品の各部の圧縮比を平均化して成形密度の差を小さくすることが可能になる。   Therefore, it becomes possible to average the compression ratio of each part of the part obtained without dividing the punch, and to reduce the difference in molding density.

この発明の給粉装置の一例を示す部分切欠き平面図Partially cutout plan view showing an example of the powder feeding device of the present invention 図１のII−II線に沿った断面図Sectional view along the line II-II in FIG. 図１のIII−III線に沿った断面図Sectional view along line III-III in FIG. 粉末掻きの先端の斜視図Perspective view of the tip of powder scraper 焼結部品の一例を示す斜視図Perspective view showing an example of sintered parts 図５のV−V線に沿った断面図Sectional view along line VV in FIG. 図５の焼結部品の成形で考えられる金型の概要を示す断面図Sectional drawing which shows the outline | summary of the metal mold | die considered by shaping | molding of the sintered part of FIG.

以下、この発明の粉末成形機の給粉装置の実施の形態を、添付図面の図１〜図４に基づいて説明する。例示の給粉装置１０は、給粉ボックス１１と、粉末成形機の金型のキャビティに投入された原料粉末の一部を掻き出す粉末掻き１２と、その粉末掻き１２を給粉ボックス１１の進退方向と直角向きに進退させる駆動機構１３を有する。   DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a powder feeding device for a powder molding machine according to the present invention will be described below with reference to FIGS. The illustrated powder feeding apparatus 10 includes a powder feeding box 11, a powder scraping 12 for scraping out a part of the raw material powder put into a cavity of a mold of a powder molding machine, and a forward and backward direction of the powder feeding box 11. And a drive mechanism 13 for advancing and retreating at right angles.

また、粉末掻き１２が前進位置にあることを検出する位置センサ１４−１と、その粉末掻き１２が後退位置にあることを検出する位置センサ１４−２を有する。 Also it has a position sensor 14 -1 for detecting that the powder scraped 12 is in the forward position, the position sensor 14 -2 detects that the powder scraping 12 is in the retracted position.

給粉ボックス１１は、ダイ１及びダイプレート５上を進退して前進位置でキャビティ９に原料粉末Ｐを投入する。この給粉ボックス１１は、原料粉末を収納したホッパ（図示せず）にホース１５を介して接続され、そのホッパから原料粉末の供給を受ける。   The powder supply box 11 advances and retreats on the die 1 and the die plate 5 and inputs the raw material powder P into the cavity 9 at the advanced position. This powder supply box 11 is connected to a hopper (not shown) containing raw material powder via a hose 15 and receives supply of raw material powder from the hopper.

キャビティ９を作り出す粉末成形機の金型は、ダイ１と下１〜下３の各パンチ２−１〜２−３と、コアロッド３と、上パンチ４を組み合わせたものになっているが、成形する部品の形状によってはコアロッド３の無い金型や、下パンチを貫通するコアロッドが逆に追加された金型、或いは、下パンチが２分割された金型や分割されていない金型なども用いられる。 Mold powder molding machine to produce a cavity 9, the die 1 and the punch 2 -1 to 2 -3 below 1 below 3, a core rod 3, but has become a combination of the upper punch 4, molding Depending on the shape of the parts to be used, a mold without the core rod 3, a mold in which a core rod penetrating the lower punch is added in reverse, a mold in which the lower punch is divided into two parts, or an undivided mold is also used. It is done.

粉末掻き１２は、前進位置でキャビティ９上に配置される穴１２ａを先端に有する（図４を同時参照）。この粉末掻き１２の先端は、成形される部品の端面に設けられる凹部に対応させて凹部の平面視形状に近似した形状にするのがよい。   The powder scraper 12 has a hole 12a disposed on the cavity 9 at the advanced position at the tip (see FIG. 4 at the same time). The tip of the powder scraper 12 should have a shape that approximates the shape of the recess in plan view, corresponding to the recess provided on the end surface of the part to be molded.

この粉末掻き１２は、ダイ１とダイプレート５の上面に形成された溝１６、１７にスライド可能に挿入されている。   The powder scraper 12 is slidably inserted into grooves 16 and 17 formed on the upper surfaces of the die 1 and the die plate 5.

溝１６、１７は、粉末掻き１２がそれらの溝に挿入されたときにその粉末掻き１２と、ダイ１と、ダイプレート５の３者の上面位置が揃うようにその深さが調整されている。   The depths of the grooves 16 and 17 are adjusted so that when the powder scraper 12 is inserted into the grooves, the upper surface positions of the powder scraper 12, the die 1 and the die plate 5 are aligned. .

例示の駆動機構１３は、給粉ボックス１１の動きに連動する連動機構で構成されている。図示の駆動機構１３は、リンク１３ａを介して給粉ボックス１１に連結されるカム１３ｂと、そのカム１３ｂに対応させて粉末掻き１２上に設けられるカムフォロア１３ｃと、粉末掻きを前進方向に付勢するばね１３ｄと、ばね１３ｄを嵌めた２本の位置固定のガイドピンＡと、そのガイドピンＡに案内されてスライドするばね受けＢを組み合わせたスライドガイド１３ｅとで構成されており、ばね受けＢに粉末掻き１２の後部が連結されている。   The illustrated drive mechanism 13 is configured by an interlocking mechanism that interlocks with the movement of the powder supply box 11. The drive mechanism 13 shown in the figure is a cam 13b connected to the powder supply box 11 via a link 13a, a cam follower 13c provided on the powder scraper 12 corresponding to the cam 13b, and biases the powder scraper in the forward direction. 13d, a guide pin A having two fixed positions fitted with the spring 13d, and a slide guide 13e that is combined with a spring receiver B that is guided by the guide pin A and slides. The rear part of the powder scraper 12 is connected to.

カム１３ｂは、ガイド溝１３ｆに挿入されてそのガイド溝１３ｆにガイドされてスライドする。なお、粉末掻き１２のガイドは、溝１６、１７によってもなされる。従って、スライドガイド１３ｅは必須の要素とはならない。   The cam 13b is inserted into the guide groove 13f and is slid by being guided by the guide groove 13f. The powder scraper 12 is also guided by the grooves 16 and 17. Therefore, the slide guide 13e is not an essential element.

この駆動機構１３は、カム１３ｂとカムフォロア１３ｃの働きによって給粉ボックス１１の後進運動が軸直角向きの直線運動に変換される。その変換後の力で給粉ボック１１が退避（後退）するときに粉末掻き１２が引き動かされ、前進位置から後退する。後退完了位置で粉末掻き１２の先端はキャビティ９上から完全に退避し、この後のキャビティ９に対する上パンチ４の押し込みが支障なく実施される。   In the drive mechanism 13, the backward movement of the powder feeding box 11 is converted into a linear movement perpendicular to the axis by the action of the cam 13 b and the cam follower 13 c. When the powder supply box 11 is retracted (retracted) by the force after the conversion, the powder scraper 12 is pulled and retracted from the advance position. The tip of the powder scraper 12 is completely retracted from above the cavity 9 at the retreat completion position, and the subsequent pressing of the upper punch 4 into the cavity 9 is performed without any trouble.

なお、一旦退避した給粉ボックス１１が、次回の給粉を行うためにキャビティ９の近辺まで前進するとカム１３ｂとカムフォロア１３ｃの係合が解かれ、ばね１３ｄの力で粉末掻き１２が前進位置に押し動かされる。   In addition, when the powder supply box 11 once retracted advances to the vicinity of the cavity 9 to perform next powder supply, the cam 13b and the cam follower 13c are disengaged, and the powder scraper 12 is moved to the advanced position by the force of the spring 13d. It is pushed and moved.

位置センサ１４−１，１４−２は、粉末掻き１２が前進位置に無いときに給粉ボックス１１が前進して粉末の供給が行なわれることを防止する目的と、粉末掻き１２が完全に退避していないときに粉末成形機が作動することを防止する目的で設けられている。 The position sensors 14 -1 and 14 -2 are for the purpose of preventing the powder supply box 11 from moving forward and supplying the powder when the powder scraper 12 is not in the forward position, and the powder scraper 12 is completely retracted. It is provided for the purpose of preventing the powder molding machine from operating when not.

粉末掻き１２が前進位置に無い状態でキャビティ９に対する給粉が行われると、目的とする箇所の粉末の掻き出しができない。また、粉末掻き１２が退避していない状態で粉末成形機が作動すると、上パンチ４が粉末掻き１２と干渉して破損することが懸念される。粉末成形機と給粉装置の動作を、位置センサ１４−１，１４−２からの信号に基づいて制御することで、その不具合や懸念を無くすことができる。 If powder supply to the cavity 9 is performed in a state where the powder scraper 12 is not in the forward position, the powder at the target location cannot be scraped. Further, when the powder molding machine is operated in a state where the powder scraper 12 is not retracted, there is a concern that the upper punch 4 may interfere with the powder scraper 12 and be damaged. By controlling the operations of the powder molding machine and the powder feeding device based on the signals from the position sensors 14 -1 and 14 -2 , the problems and concerns can be eliminated.

以上の通りに動作する図示の駆動機構１３は、粉末掻き１２を動かす専用の駆動源を用いていないため、経済性に優れる。ただし、粉末掻き１２は、専用の駆動源（エアーシリンダや電動シリンダなどでよい）を有する駆動機構を設けて進退させてもよい。   The illustrated drive mechanism 13 that operates as described above does not use a dedicated drive source that moves the powder scraper 12, and thus is excellent in economic efficiency. However, the powder scraper 12 may be moved back and forth by providing a drive mechanism having a dedicated drive source (which may be an air cylinder or an electric cylinder).

給粉ボックス１１が所定位置まで後退したことを位置センサで検出し、その位置センサからの検出信号に基づいて専用の駆動源を駆動して粉末掻きを後退させるようにしても、発明の目的（下パンチの分割数を少なくして成形密度を均一化させる）が達成される。   It is an object of the invention to detect that the powder feeding box 11 has been retracted to a predetermined position with a position sensor and to drive a dedicated drive source based on a detection signal from the position sensor to retract the powder scraping ( The number of divisions of the lower punch is reduced and the molding density is made uniform).

なお、例示の給粉装置１０は、粉末掻き１２と駆動機構１３を中心対称の配置にして２組設けたが、この発明は、端面に凹部が１箇所設けられる焼結部品の成形にも利用することができる。   In addition, although the illustrated powder supplying apparatus 10 is provided with two sets of the powder scraper 12 and the drive mechanism 13 in a symmetric arrangement, the present invention is also used for molding a sintered part provided with one recess on the end face. can do.

例示の給粉装置を試作し、図５に示す形状の焼結部品（同部品用の圧粉体）の成形に利用した。その結果、下パンチの分割数を増やさずに部品の各部における原料粉末の圧縮比を平均化して得られる圧粉体の密度差を小さくすることができた。この効果は、焼結部品の信頼性向上につながる。   An exemplary powder feeding apparatus was prototyped and used for forming a sintered part having the shape shown in FIG. 5 (a green compact for the part). As a result, it was possible to reduce the density difference of the green compact obtained by averaging the compression ratio of the raw material powder at each part of the part without increasing the number of divisions of the lower punch. This effect leads to improved reliability of the sintered part.

１ ダイ
２−１ 下１パンチ
２−２ 下２パンチ
２−３ 下３パンチ
３ コアロッド
４ 上パンチ
５ ダイプレート
６ ガイドポスト
７ 上パンチプレート
８ ガイドブッシュ
９ キャビティ
１０ 給粉装置
１１ 給粉ボックス
１２ 粉末掻き
１２ａ 穴
１３ 駆動機構
１３ａ リンク
１３ｂ カム
１３ｃ カムフォロア
１３ｄ ばね
１３ｅ スライドガイド
１３ｆ ガイド溝
１４−１，１４−２ 位置センサ
１５ ホース
１６，１７ 溝
２０ 焼結部品
２１ 本体部
２２ 軸穴
２３ ボス部
２４ 円形溝
２５ 凹部
Ｐ 原料粉末 1 Die 2 -1 under 1 punch 2-2 below 2 punch 2 -3 3 below punch 3 core rod 4 upper punch 5 die plate 6 guide post 7 upper punch plate 8 Guide bush 9 cavity 10 powder feeding device 11 feeder box 12 powder scraping 12a hole 13 drive mechanism 13a links 13b cam 13c cam follower 13d spring 13e slide guide 13f guide grooves 14 -1, 14 -2 position sensor 15 hose 16, 17 grooves 20 sintered part 21 body part 22 shaft hole 23 boss part 24 a circular Groove 25 Recess P Raw material powder

Claims (5)

ダイ（１）及びダイプレート（５）上を進退して前進位置で粉末成形機の金型のキャビティ（９）に原料粉末（Ｐ）を投入する給粉ボックス（１１）と、キャビティ（９）に投入された原料粉末の一部を掻き出す粉末掻き（１２）と、その粉末掻き（１２）を前記給粉ボックス（１１）の進退方向と直角向きに進退させる駆動機構（１３）を有し、
前記粉末掻き（１２）は、前進位置で前記キャビティ（９）上に配置される穴（１２ａ）を先端に有し、この粉末掻き（１２）が前記ダイ（１）とダイプレート（５）の上面に形成された溝（１６，１７）にスライド可能に挿入され、前記給粉ボックス（１１）が前記粉末掻き（１２）の上方から外れる位置まで後退したときに前記粉末掻き（１２）が前記駆動機構（１３）に駆動されて後退してキャビティ（９）に投入された原料粉末（Ｐ）の一部を外部に掻き出すようにした粉末成形機の給粉装置。 A powder feeding box (11) for feeding the raw powder (P) into the mold cavity (9) of the powder molding machine in the forward position by moving back and forth on the die (1) and the die plate (5), and the cavity (9) A powder scraper (12) for scraping out a part of the raw material powder charged into the container, and a drive mechanism (13) for moving the powder scraper (12) in a direction perpendicular to the advancing / retreating direction of the powder feeding box (11),
The powder scraper (12) has a hole (12a) disposed on the cavity (9) at the forward position at the tip, and the powder scraper (12) is formed between the die (1) and the die plate (5). The powder scraper (12) is inserted into the grooves (16, 17) formed on the upper surface so as to be slidable, and the powder scraper (12) is retracted when the powder feeding box (11) is retracted from a position above the powder scraper (12). A powder feeder for a powder molding machine, driven by a drive mechanism (13) and moved backward to scrape part of the raw material powder (P) charged into the cavity (9). 前記給粉ボックス（１１）と前記粉末掻き（１２）との間に、給粉ボックス（１１）の後進運動を軸直角向きの直線運動に変換して前記粉末掻き（１２）に伝達する連動機構を設け、その連動機構を前記駆動機構（１３）となした請求項１に記載の粉末成形機の給粉装置。   An interlocking mechanism that converts the backward movement of the powder feeding box (11) into a linear motion perpendicular to the axis and transmits it to the powder scraping (12) between the powder feeding box (11) and the powder scraping (12). The powder feeding apparatus for a powder molding machine according to claim 1, wherein the interlocking mechanism is the drive mechanism (13). 前記連動機構を、給粉ボックス（１１）に連結されてその給粉ボックス（１１）とともに進退するカム（１３ａ）と、前記粉末掻き（１２）に設けられてカム（１３ｂ）によって粉末掻き（１２）が後退する方向に押し動かされるカムフォロア（１３ｃ）と、粉末掻き（１２）を前進方向に付勢するばね（１３ｃ）を組み合わせて構成した請求項１又は２に記載の粉末成形機の給粉装置。   The interlocking mechanism is connected to the powder supply box (11) and is advanced and retracted together with the powder supply box (11), and the powder scraper (12) is provided with the cam (13b) to scrape the powder (12 3) A powder follower for a powder molding machine according to claim 1 or 2, comprising a cam follower (13c) that is pushed and moved in a backward direction and a spring (13c) that urges the powder scraper (12) in the forward direction. apparatus. 前記粉末掻き（１２）を２組設け、その２組の粉末掻き（１２）を平面視でキャビティ（９）の左右に対向して配置した請求項１〜３のいずれか１項に記載の粉末成形機の給粉装置。   The powder according to any one of claims 1 to 3, wherein two sets of the powder scraper (12) are provided, and the two sets of the powder scraper (12) are arranged facing the left and right of the cavity (9) in plan view. Powdering device for molding machine. 前記粉末掻き（１２）が前進位置にあることと後退位置にあることを検出する位置センサ（１４−１，１４−２）を設け、それ等の位置センサからの検出信号を粉末成形機の動作の制御に用いるようにした請求項１〜４のいずれか１項に記載の粉末成形機の給粉装置。 Position sensors (14 −1 , 14 −2 ) for detecting that the powder scraper (12) is in the forward position and the backward position are provided, and detection signals from these position sensors are used as the operation of the powder molding machine. The powder feeding apparatus for a powder molding machine according to any one of claims 1 to 4, wherein the powder feeding machine is used for control of the powder molding machine.
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CN105689706A (en) * 2016-02-14 2016-06-22 杭州东博自动化科技有限公司 Material box with material scraping function
CN113223850A (en) * 2021-06-08 2021-08-06 通友智能装备(江苏)有限公司 Controllable clean formula magnetism embryo die-casting make-up machine of intensity
CN113695602A (en) * 2021-08-20 2021-11-26 吉林大学重庆研究院 Heterogeneous material selective laser additive manufacturing powder laying device and additive manufacturing method
CN114378314A (en) * 2022-01-18 2022-04-22 深圳市金石三维打印科技有限公司 Powder scraping device for SLM metal powder printer

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105689706A (en) * 2016-02-14 2016-06-22 杭州东博自动化科技有限公司 Material box with material scraping function
CN105689706B (en) * 2016-02-14 2024-06-07 杭州东博自动化科技有限公司 Material box with scraping function
CN113223850A (en) * 2021-06-08 2021-08-06 通友智能装备(江苏)有限公司 Controllable clean formula magnetism embryo die-casting make-up machine of intensity
CN113695602A (en) * 2021-08-20 2021-11-26 吉林大学重庆研究院 Heterogeneous material selective laser additive manufacturing powder laying device and additive manufacturing method
CN113695602B (en) * 2021-08-20 2023-01-17 吉林大学重庆研究院 Heterogeneous material selective laser additive manufacturing powder laying device and additive manufacturing method
CN114378314A (en) * 2022-01-18 2022-04-22 深圳市金石三维打印科技有限公司 Powder scraping device for SLM metal powder printer
CN114378314B (en) * 2022-01-18 2022-07-08 深圳市金石三维打印科技有限公司 A scrape whitewashed device for SLM metal powder printer

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