JP4725722B2 - Powder input method - Google Patents

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JP4725722B2
JP4725722B2 JP2005226576A JP2005226576A JP4725722B2 JP 4725722 B2 JP4725722 B2 JP 4725722B2 JP 2005226576 A JP2005226576 A JP 2005226576A JP 2005226576 A JP2005226576 A JP 2005226576A JP 4725722 B2 JP4725722 B2 JP 4725722B2
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powder
box
powder box
amount
supply
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JP2007038272A (en
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和通 中谷
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Toyota Motor Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/30—Feeding material to presses
    • B30B15/302—Feeding material in particulate or plastic state to moulding presses
    • B30B15/304—Feeding material in particulate or plastic state to moulding presses by using feed frames or shoes with relative movement with regard to the mould or moulds

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  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)

Description

本発明は、粉末成形プレスの金型に対し、一定量の粉末を投入する方法に関するものである。   The present invention relates to a method of charging a certain amount of powder into a mold of a powder molding press.

粉末成形プレスの給粉装置は、粉末供給源から供給される粉末を一時的に貯留する粉箱を備え、当該粉箱を粉末受給位置から金型のキャビティー上の粉末払出位置へとスライドさせて、金型のキャビティーへと粉箱内の粉末を投入する装置構成が一般的である。そして、金型へと投入される粉末の密度を一定に保つため、従来から種々の工夫がなされている。例えば、粉箱から金型のキャビティーへと粉末を投入する際の粉末密度を一定とするために、粉箱の底面を多孔状又は網状の粉末受け棚で構成すると共に、該粉末受け棚を加振機によって上下に振動させることにより、粉箱内の粉末をほぐしながら金型キャビティへと粉末を振い落す手法（例えば、特許文献１参照。）や、粉箱に振動を与えながら金型キャビティへと粉末を振い落す手法（例えば、特許文献２参照。）が挙げられる。   The powder feeding device of the powder molding press includes a powder box for temporarily storing powder supplied from a powder supply source, and slides the powder box from the powder receiving position to the powder discharging position on the mold cavity. In general, the apparatus configuration is such that the powder in the powder box is put into the cavity of the mold. In order to keep the density of the powder charged into the mold constant, various ideas have been conventionally made. For example, in order to make the powder density constant when pouring powder from the powder box into the cavity of the mold, the bottom surface of the powder box is configured with a porous or net-like powder receiving rack, and the powder receiving rack is A method of shaking the powder into the mold cavity while loosening the powder in the powder box by vibrating it up and down with a shaker (see, for example, Patent Document 1) or a mold while vibrating the powder box There is a technique (for example, see Patent Document 2) of shaking powder into a cavity.

特開平６−１３６４０３号公報（〔請求項１〕、〔００１６〕）JP-A-6-136403 ([Claim 1], [0016]) 実公平６−３４３３７号公報（第２頁第４欄、図１）Japanese Utility Model Publication No. 6-34337 (2nd page, 4th column, FIG. 1)

しかしながら、上記従来の手法によっても、成形の初期段階で得られる粉末成形品（数個）の密度が、連続成形時点で得られる製品よりも低くなる傾向があり、初期段階の粉末成形品の重量不良、寸法不良、割れ不良の原因となっていた。
かかる不良は、粉箱に粉末が供給される時点で、粉末の持つ安息角（粉末を水平面に静かに落下堆積させたときにできる円錐状の堆積物の側面斜面が、水平面とつくる角度（傾斜角）のこと。）が影響して、粉箱に粉末が均等に堆積せず、その結果、粉箱を粉末で満たすことができないことが一因となっている。 However, even with the above conventional method, the density of the powder molded product (several pieces) obtained at the initial stage of molding tends to be lower than the product obtained at the time of continuous molding, and the weight of the powder molded product at the initial stage It was a cause of defects, dimensional defects, and crack defects.
This failure is caused by the angle of repose of the powder (when the powder is gently dropped and deposited on the horizontal plane, the angle formed by the side slope of the conical sediment formed with the horizontal plane) This is due to the fact that the powder does not accumulate evenly in the powder box due to the influence of the angle), and as a result the powder box cannot be filled with powder.

本発明は上記課題に鑑みてなされたものであり、その目的とするところは、粉末成形方法において、最初の成形を開始する前から、粉箱内の粉末密度を均等にすることを可能とし、成形の初期段階から所望の重量を有する粉末成形品を得ることにある。   The present invention has been made in view of the above problems, and the object of the present invention is to make it possible to equalize the powder density in the powder box before starting the first molding in the powder molding method, The object is to obtain a powder molded product having a desired weight from the initial stage of molding.

上記課題を解決するための、本発明に係る粉末投入方法は、金型のキャビティ容積を上回る容積を有する粉箱に一時的に粉末を貯留し、該粉箱から金型のキャビティへと粉末を投入して粉末成形を行う粉末投入方法であって、連続粉末成形ステップにおける最初の成形品のための粉末投入前に、粉箱へと粉末を供給する際、粉箱内の粉量が所定量に至る前の時点で、粉末供給を一時中断して粉箱を振動させるステップと、粉末供給を再開するステップと、粉箱内の粉量が所定量に達した後に、粉箱から成形型へと粉末を投入するステップとを含むことを特徴とするものである。
本発明によれば、成形品の成形開始前に、粉箱へと粉末を供給する際、粉箱内の粉量が所定量に至る前の時点で、粉末供給を一時中断して粉箱を振動させることで、粉末の持つ安息角が影響して粉箱内に円錐状に堆積する粉末を崩し、粉箱の全体に渡って均等に粉末を堆積させることが可能となる。そして、粉末供給を再開し、粉箱内の粉量が所定量に達した後に、粉箱から成形型へと粉末を投入することで、最初の成形を開始する前から、粉箱内の粉末密度を均等にすることが可能となる。 In order to solve the above-mentioned problems, the powder injection method according to the present invention temporarily stores powder in a powder box having a volume that exceeds the cavity volume of the mold, and puts the powder from the powder box into the mold cavity. A powder charging method for performing powder molding by charging, and when the powder is supplied to the powder box before the powder for the first molded product in the continuous powder molding step, the amount of powder in the powder box is a predetermined amount. At the time before reaching the position, the powder supply is temporarily suspended to vibrate the powder box, the powder supply is resumed, and the amount of powder in the powder box reaches a predetermined amount, and then the powder box is transferred to the mold. And a step of charging the powder.
According to the present invention, when the powder is supplied to the powder box before the start of the molding of the molded product, the powder supply is temporarily interrupted at a time before the amount of powder in the powder box reaches a predetermined amount. By oscillating, the angle of repose of the powder affects the powder that accumulates in a conical shape in the powder box, and the powder can be deposited uniformly throughout the powder box. Then, after the powder supply is restarted and the amount of powder in the powder box reaches a predetermined amount, the powder in the powder box is started before the first molding is started by charging the powder from the powder box to the mold. It becomes possible to make the density uniform.

また、本発明においては、粉箱内の粉量が所定量に至る前の時点で、前記粉末供給を一時中断して粉箱を振動させた後、粉末供給を再開するステップを複数回繰り返すことが望ましい。
本発明によれば、かかるステップを複数回繰り返すことで、最初の成形を開始する前から、粉箱内の粉末密度をより確実に均等化することが可能となる。 Further, in the present invention, at the time before the amount of powder in the powder box reaches a predetermined amount, the powder supply is temporarily interrupted and the powder box is vibrated, and then the step of restarting the powder supply is repeated a plurality of times. Is desirable.
According to the present invention, by repeating this step a plurality of times, it is possible to more reliably equalize the powder density in the powder box before starting the first molding.

また、本発明において、前記粉末供給を一時中断して粉箱を振動させるステップを、粉箱内に所定量の３０〜６０％まで粉末が供給された時点で、少なくとも１回行うことが望ましい。
本発明によれば、粉箱を振動させることによる、粉箱内の粉末密度の均等化が確実に行われることとなる。 Moreover, in this invention, it is desirable to perform the step which interrupts the said powder supply temporarily, and vibrates a powder box at least once, when powder is supplied to 30-60% of predetermined amount in a powder box.
According to the present invention, equalization of the powder density in the powder box is reliably performed by vibrating the powder box.

また、本発明において、前記粉箱の振動を、粉箱から金型のキャビティへと粉末を投入する際に、粉箱を粉末供給位置から金型上へと移動させるための駆動手段によって与えることが望ましい。
本発明によれば、粉箱を大きく揺り動かすように振動させることが可能となり、粉箱内に円錐状に堆積される粉末を効果的に崩し、粉箱内に均等に堆積させることが可能となる。 Also, in the present invention, the powder box is vibrated by a driving means for moving the powder box from the powder supply position onto the mold when the powder is charged from the powder box into the mold cavity. Is desirable.
According to the present invention, it is possible to vibrate the powder box so as to greatly shake, and it is possible to effectively break down the powder deposited in a conical shape in the powder box and deposit it evenly in the powder box. .

本発明はこのように構成したので、粉末成形方法において、最初の成形を開始する前から、粉箱内の粉末密度を均等にすることが可能となり、その結果として、成形の初期段階から所望の重量を有する粉末成形品を得ることが可能となる。   Since the present invention is configured in this way, in the powder molding method, it is possible to equalize the powder density in the powder box before starting the first molding, and as a result, the desired density can be obtained from the initial stage of molding. It becomes possible to obtain a powder molded product having a weight.

以下、本発明の実施の形態を添付図面に基づいて説明する。
本発明の実施の形態に係る粉末成形プレスの給粉装置１０は、図２に示されるように、原料粉ホッパー１２と、粉末秤量機１４と、１回の成形に必要な粉量を上回る粉末容積を有するサブホッパー１６と、サブホッパー１６の粉末出口を開閉するシャッター１８と、１回の成形に必要な粉量を上回る粉末容積を有する粉箱２０とをこの順序で配置したものである。粉箱２０の容積は、金型２４のキャビティ２６の容積を上回るものであり、具体例として、金型のキャビティ２６の容積に対し５〜２０倍の容積を有している。
また、サブホッパー１６には、サブホッパー内の粉量感知センサー２２を備え、粉箱２０には、粉密度センサー４２を備えている。更に、粉箱２０を、シャッター１８直下の位置Ｐ１と、金型２４のキャビティー２６直上の位置Ｐ２との間で移動させる駆動手段２８と、粉量感知センサー２２の検出結果に基づき、１回の成形に必要な粉量を基準に調整された粉量を切出すように、粉末秤量機１４を制御する制御手段３０とを備えている。 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in FIG. 2, the powder feeding apparatus 10 of the powder molding press according to the embodiment of the present invention includes a raw material powder hopper 12, a powder weighing machine 14, and a powder that exceeds the amount of powder necessary for one molding. A sub hopper 16 having a volume, a shutter 18 for opening and closing a powder outlet of the sub hopper 16, and a powder box 20 having a powder volume exceeding the amount of powder necessary for one molding are arranged in this order. The volume of the powder box 20 exceeds the volume of the cavity 26 of the mold 24, and as a specific example, has a volume 5 to 20 times the volume of the cavity 26 of the mold.
The sub hopper 16 includes a powder amount sensor 22 in the sub hopper, and the powder box 20 includes a powder density sensor 42. Further, the powder box 20 is moved once between the position P1 immediately below the shutter 18 and the position P2 directly above the cavity 26 of the mold 24, and the detection result of the powder amount sensor 22 once. And a control means 30 for controlling the powder weigher 14 so as to cut out the amount of powder adjusted based on the amount of powder necessary for forming the powder.

粉末成形プレスの給粉装置１０の各構成について更に説明する。
ます、粉末秤量機１４は、振動式フィーダー３２と、漏斗状の粉末の一時貯留容器３４と、一時貯留容器３４の重量測定センサー３６と、一時貯留容器３４の粉末出口を開閉するシャッター３８とを備えている。シャッター３８は、シリンダー等の駆動手段によって開閉駆動されるものである。なお、原料粉ホッパー１２の直下に粉末秤量機１４を配置し、かかる粉末秤量機１４で計量された粉末を、振動式フィーダー３２に換えて、直接的に若しくは粉供給ロボットを用いて、サブホッパー１６へと供給することも可能である。 Each structure of the powder supply apparatus 10 of the powder molding press will be further described.
First, the powder weighing machine 14 includes a vibratory feeder 32, a funnel-shaped temporary storage container 34, a weight measurement sensor 36 of the temporary storage container 34, and a shutter 38 that opens and closes the powder outlet of the temporary storage container 34. I have. The shutter 38 is driven to open and close by a driving means such as a cylinder. A powder weigher 14 is arranged directly under the raw material powder hopper 12, and the powder weighed by the powder weigher 14 is replaced with the vibratory feeder 32 directly or by using a powder supply robot. 16 can also be supplied.

サブホッパー１６は漏斗状をなしており、その粉末出口は、シャッター１８の設置スペースを確保しつつ、粉箱２０の上面に可能な限り接近するように配置されている。したがって、サブホッパー１６から重力落下によって粉箱２０に落下した粉末が一定量以上になると、粉箱２０内に堆積した粉末自体がサブホッパー１６の粉末出口を塞ぐことで、粉末の流れはせき止められ、サブホッパー１６から粉箱２０への粉末の移動は物理的に停止することとなる。なお、シャッター１８は、シリンダー等の駆動手段によって開閉駆動されるものである   The sub hopper 16 has a funnel shape, and its powder outlet is disposed as close as possible to the upper surface of the powder box 20 while securing the installation space of the shutter 18. Therefore, when the amount of powder falling from the sub hopper 16 to the powder box 20 due to gravity drop exceeds a certain amount, the powder itself accumulated in the powder box 20 blocks the powder outlet of the sub hopper 16 and the flow of the powder is blocked. The movement of the powder from the sub hopper 16 to the powder box 20 is physically stopped. The shutter 18 is driven to open and close by a driving means such as a cylinder.

粉箱２０は、底面が開放され、上面は、サブホッパー１６から粉末供給を受けるための必要最小限の開口を備える蓋２０ａで塞がれている。そして、箱体２０は、ダイス２４Ａの上面に連続する平坦なスライドテーブル４０上を摺動自在となっている。更に、駆動手段２８を構成するシリンダのピストンロッド２８ａの伸縮により、箱体２０はスライドテーブル４０上を摺動し、箱体２０内の粉末は、シャッター１８直下の位置Ｐ１と、金型２４のキャビティー２６直上の位置Ｐ２との間を、矢印Ｓで示すように移動する。蓋２０ａは、粉箱２０がシャッター１８直下の位置Ｐ１と金型２４のキャビティー２６直上の位置Ｐ２との間を移動する間、サブホッパー１６の粉末出口を塞ぐことができるように、その一部が、図２の如く粉箱２０の端部から延長されている。なお、箱体２０、駆動手段２８、スライドテーブル４０、金型２４のダイス２４Ａ、下ポンチ２４Ｂ、上ポンチ２４Ｃは、既存の粉末成形プレスおよびその給粉装置と同様の構成を有するものである。   The powder box 20 has an open bottom surface, and the top surface is closed with a lid 20 a having a minimum necessary opening for receiving powder supply from the sub hopper 16. The box 20 is slidable on a flat slide table 40 continuous with the upper surface of the die 24A. Furthermore, the expansion and contraction of the piston rod 28a of the cylinder constituting the driving means 28 causes the box 20 to slide on the slide table 40, and the powder in the box 20 is separated from the position P1 directly below the shutter 18 and the mold 24. It moves between the position P2 immediately above the cavity 26 as shown by the arrow S. The lid 20a is arranged so that the powder outlet of the sub hopper 16 can be closed while the powder box 20 moves between the position P1 directly below the shutter 18 and the position P2 directly above the cavity 26 of the mold 24. The part is extended from the end of the powder box 20 as shown in FIG. The box 20, the driving means 28, the slide table 40, the die 24A of the mold 24, the lower punch 24B, and the upper punch 24C have the same configuration as that of an existing powder forming press and its powder feeding apparatus.

サブホッパー１６内の粉量感知センサー２２は、サブホッパー１６内の粉量が、最適な粉量の範囲の最少量以下であることを検出する最少粉量感知センサー２２Ａと、サブホッパー１６内の粉量が、最適な粉量の範囲の最大量以上であることを検出する最大粉量感知センサー２２Ｂとを備えており、何れの検出結果も、制御手段３０によって把握されるようになっている。
なお、制御手段３０は、パーソナルコンピュータ等の電子計算機によって構成することが可能であり、センサー２２の感知信号を受信するのみならず、駆動手段２８の作動制御、粉末秤量機１４の重量測定センサー３６の感知信号の受信、粉末秤量機１４によるサブホッパー１６への粉末供給量の決定、振動式フィーダー３２への制御信号の送受信、粉密度センサー４２の感知信号の受信等を行うものである。 The powder amount sensor 22 in the sub hopper 16 includes a minimum powder amount sensor 22A for detecting that the powder amount in the sub hopper 16 is equal to or less than the minimum amount in the range of the optimum powder amount, and the sub hopper 16 A maximum powder amount sensor 22B that detects that the powder amount is equal to or greater than the maximum amount in the optimum powder amount range is provided, and any detection result is grasped by the control means 30. .
The control means 30 can be constituted by an electronic computer such as a personal computer. The control means 30 not only receives the sensing signal of the sensor 22, but also controls the operation of the driving means 28 and the weight measurement sensor 36 of the powder weighing machine 14. , The determination of the amount of powder supplied to the sub hopper 16 by the powder weigher 14, the transmission / reception of the control signal to the vibratory feeder 32, the reception of the detection signal of the powder density sensor 42, and the like.

続いて、図１、図２を参照しながら、本発明の実施の形態に係る粉末投入方法の各ステップを説明する。
（１）まず、粉末秤量器１４によって、原料粉ホッパー１２から必要量の粉末をサブホッパー１６へと供給する。そして、シャッター１８を開き、サブホッパ１６内の粉末を、粉箱２０へと投入する。前述の如く、粉箱２０を塞ぐ蓋２０ａには、サブホッパー１６から粉末供給を受けるための必要最小限の開口が形成されているので、粉箱が位置Ｐ１にあるとき、シャッター１８を開くことのみによって、粉末はサブホッパー１６から粉箱２０へと落下する。サブホッパー１６内の粉末が無くなると、シャッター１８を閉じて、原料粉ホッパー１２から粉末供給を受ける。そして、再びシャッター１８を開き、粉末を粉箱２０へと供給する。以上の粉末供給作業を、複数回（本実施の形態では５回）繰り返す。なお、この供給回数は、粉箱２０が粉末で満たされた状態の、３０〜６０％の粉末が供給されるための回数である。 Then, each step of the powder injection | throwing-in method which concerns on embodiment of this invention is demonstrated, referring FIG. 1, FIG.
(1) First, the powder weigher 14 supplies a necessary amount of powder from the raw material powder hopper 12 to the sub hopper 16. Then, the shutter 18 is opened, and the powder in the sub hopper 16 is put into the powder box 20. As described above, the lid 20a that closes the powder box 20 is formed with the minimum necessary opening for receiving the powder supply from the sub hopper 16, so that the shutter 18 is opened when the powder box is at the position P1. Only by this, the powder falls from the sub-hopper 16 to the powder box 20. When the powder in the sub hopper 16 runs out, the shutter 18 is closed and the powder supply from the raw material powder hopper 12 is received. Then, the shutter 18 is opened again, and the powder is supplied to the powder box 20. The above powder supply operation is repeated a plurality of times (in this embodiment, five times). The number of times of supply is the number of times for supplying 30 to 60% of the powder in a state where the powder box 20 is filled with the powder.

（２）本発明の実施の形態では、５回の粉末供給を完了した後、シャッター１８を閉じる。
（３）そして、駆動手段２８によって粉箱２０を振動させる。この振動は、位置Ｐ１から位置Ｐ２へと粉箱２０を移動させる動作よりもストロークを短くして、複数回（２回から７回程度）行う。かかる振動により、粉箱２０内で円錐状に堆積した粉末は崩され、粉箱２０の全体に平均的に堆積する。
（４）続いて、シャッター１８を開く。
（５）そして、サブホッパー１６から粉箱２０への粉供給を再開する。
（６）サブホッパー１６から粉箱２０に落下した粉末が一定量以上になると、粉箱２０内に堆積した粉末自体がサブホッパー１６の粉末出口を塞ぐので、粉末の流れはせき止められ、サブホッパー１６から粉箱２０への粉末の移動は物理的に停止する。この状態では、サブホッパー１６内の粉末が残存していることから、センサー２２によって粉末が感知される。このように、センサー２２により粉末が感知されるまで、サブホッパー１６から粉箱２０への粉供給を繰り返す。 (2) In the embodiment of the present invention, the shutter 18 is closed after the powder supply is completed five times.
(3) The powder box 20 is vibrated by the driving means 28. This vibration is performed a plurality of times (about 2 to 7 times) with a shorter stroke than the operation of moving the powder box 20 from the position P1 to the position P2. Due to such vibration, the powder deposited in a conical shape in the powder box 20 is broken, and is averagely deposited on the entire powder box 20.
(4) Subsequently, the shutter 18 is opened.
(5) The powder supply from the sub hopper 16 to the powder box 20 is resumed.
(6) When the amount of the powder falling from the sub hopper 16 to the powder box 20 exceeds a certain amount, the powder itself accumulated in the powder box 20 blocks the powder outlet of the sub hopper 16, so that the flow of the powder is blocked and the sub hopper The movement of the powder from 16 to the powder box 20 is physically stopped. In this state, since the powder in the sub hopper 16 remains, the sensor 22 senses the powder. Thus, the powder supply from the sub hopper 16 to the powder box 20 is repeated until the sensor 22 senses the powder.

（７）ステップ（６）で、粉末が感知されると、シャッター１８を閉じる。
（８）そして、ステップ（３）と同様に、駆動手段２８によって粉箱２０を振動させる。かかる振動により、粉箱２０内で円錐状に堆積した粉末は崩され、粉箱２０の全体に平均的に堆積する。
（９）再度、シャッター１８を開く。
（１０）ステップ（８）において、粉箱２０内に、円錐状に堆積した粉末が崩された後も、サブホッパー１６内の粉末が残存していることが、センサー２２によって感知された場合には、それ以上の粉末の落下は生じないということであり、粉箱２０内には粉末が既に満たされた状態となっている。そこで、駆動手段２８によって粉箱２０を位置Ｐ１から位置Ｐ２へと粉箱２０を移動させ、粉末成形を開始する。
（１１）一方、ステップ（１０）において、センサー２２が粉末を感知しない場合には、ステップ（８）において、円錐状に堆積した粉末が崩された状態で、サブホッパー１６内の粉末が更に粉箱２０内へと落下したということである。よって、粉箱２０は未だ粉末で満たされていない状態にある。この場合には、再度シャッター１８を閉じる。
（１２）そして、原料粉ホッパー１２からサブホッパー１６に粉末を供給する。
（１３）再度シャッター１８を開き、サブホッパー１６から粉箱２０へと粉末を供給する。そして、センサー２２によって粉末が感知された時点で、粉箱２０内に粉末が満たされた状態となっている。そこで、駆動手段２８によって粉箱２０を位置Ｐ１から位置Ｐ２へと粉箱２０を移動させ、粉末成形を開始する。 (7) When powder is detected in step (6), the shutter 18 is closed.
(8) Then, the powder box 20 is vibrated by the driving means 28 as in step (3). Due to such vibration, the powder deposited in a conical shape in the powder box 20 is broken, and is averagely deposited on the entire powder box 20.
(9) Open the shutter 18 again.
(10) When the sensor 22 senses that the powder in the sub hopper 16 remains in the powder box 20 after the powder deposited in the conical shape is broken in the step (8). Means that no further dropping of the powder occurs, and the powder box 20 is already filled with the powder. Therefore, the powder box 20 is moved from the position P1 to the position P2 by the driving means 28, and powder molding is started.
(11) On the other hand, if the sensor 22 does not detect the powder in step (10), the powder in the sub hopper 16 is further powdered in step (8) while the conically deposited powder is broken. That is, it has fallen into the box 20. Therefore, the powder box 20 is not yet filled with powder. In this case, the shutter 18 is closed again.
(12) Then, the powder is supplied from the raw material powder hopper 12 to the sub hopper 16.
(13) Open the shutter 18 again and supply the powder from the sub hopper 16 to the powder box 20. When the powder is detected by the sensor 22, the powder box 20 is filled with the powder. Therefore, the powder box 20 is moved from the position P1 to the position P2 by the driving means 28, and powder molding is started.

なお、粉末成形の開始後は、シャッター１８を開けたままにしておくことにより、粉箱２０が位置Ｐ１に戻った時点で、自動的にサブホッパー１６から粉末が供給される。前述の如く、蓋２０ａは、粉箱２０がシャッター１８直下の位置Ｐ１と金型２４のキャビティー２６直上の位置Ｐ２との間を移動する間、サブホッパー１６の粉末出口を塞ぐことができるように、その一部が粉箱２０の端部から延長されている。よって、シャッター１８を開けたままで粉箱２０を位置Ｐ１から移動させても、サブホッパー１６から粉末が漏れ出すことはない。   Note that, after starting the powder molding, the shutter 18 is kept open, so that the powder is automatically supplied from the sub hopper 16 when the powder box 20 returns to the position P1. As described above, the lid 20a can block the powder outlet of the sub hopper 16 while the powder box 20 moves between the position P1 just below the shutter 18 and the position P2 just above the cavity 26 of the mold 24. In addition, a part thereof is extended from the end of the powder box 20. Therefore, even if the powder box 20 is moved from the position P1 with the shutter 18 opened, the powder does not leak from the sub hopper 16.

上記構成をなす、本発明の実施の形態によれば、次のような作用効果を得ることが可能である。まず、成形品の成形開始前に、粉箱２０へと粉末を供給する際、粉箱内の粉量が所定量（粉箱が粉末で満たされた状態）に至る前の時点で、粉末供給を一時中断して粉箱を振動させることで（ステップ（３）、（８））、粉末の持つ安息角が影響して粉箱２０内に円錐状に堆積する粉末を崩し、粉箱２０の全体に渡って均等に粉末を堆積させることが可能となる。そして、粉末供給を再開し（ステップ（５）、（１２））、粉箱２０内の粉量が所定量に達した後に（ステップ（１０））、粉箱２０から成形型２４へと粉末を投入することで、最初の成形を開始する前から、粉箱２０内の粉末密度を均等にすることが可能となる。   According to the embodiment of the present invention configured as described above, the following operational effects can be obtained. First, when powder is supplied to the powder box 20 before the molding of the molded product is started, the powder is supplied before the amount of powder in the powder box reaches a predetermined amount (the powder box is filled with powder). Is temporarily suspended to vibrate the powder box (steps (3) and (8)), the angle of repose of the powder affects the powder deposited in a conical shape in the powder box 20, and the powder box 20 It is possible to deposit the powder evenly throughout. Then, the powder supply is resumed (steps (5) and (12)), and after the amount of powder in the powder box 20 reaches a predetermined amount (step (10)), the powder is transferred from the powder box 20 to the mold 24. By charging, the powder density in the powder box 20 can be made uniform before the first molding is started.

図３（ａ）、（ｂ）には、密度センサー４２の出力電圧Ｖ（粉末密度に比例する）と、成形個数Ｎとの関係との関係が示されている。ここで、図３（ａ）は、サブホッパー１６から粉箱２０へと粉末を供給する際に、粉箱２０に振動を与えなかった場合を示しており、成形の初期段階では、粉箱２０の粉末密度が低いことが読み取れる。一方、図３（ｂ）は、本発明の実施の形態を示しており、成形の初期段階における、粉箱２０の粉末密度は、連続成形時の粉末密度と同様であることが読み取れる。図３（ｃ）には、本発明の実施の形態に係る、成形体重量Ｇと成形個数Ｎとの関係を示している。このように、本発明の実施の形態では、成形の初期段階から、所望の重量を有する粉末成形品を得ることが可能となる。   3A and 3B show the relationship between the output voltage V of the density sensor 42 (proportional to the powder density) and the number N of moldings. Here, FIG. 3A shows a case where the powder box 20 is not vibrated when the powder is supplied from the sub hopper 16 to the powder box 20, and in the initial stage of molding, the powder box 20 is shown. It can be seen that the powder density is low. On the other hand, FIG. 3B shows an embodiment of the present invention, and it can be seen that the powder density of the powder box 20 at the initial stage of molding is the same as the powder density at the time of continuous molding. FIG. 3C shows the relationship between the molded body weight G and the number N of molded products according to the embodiment of the present invention. Thus, in the embodiment of the present invention, a powder molded product having a desired weight can be obtained from the initial stage of molding.

また、粉箱２０内の粉量が所定量に至る前の時点で、サブホッパー１６から粉箱２０への粉末供給を一時中断して粉箱２０を振動させ、その後、粉末供給を再開するまでのステップを複数回繰り返すことで（ステップ（３）〜（５）、（８）〜（１２））、最初の成形を開始する前から、粉箱２０内の粉末密度を、より確実に均等化することが可能となる。
又、粉末供給を一時中断して粉箱を振動させるステップ（ステップ（３））を、粉箱内に所定量の３０〜６０％まで粉末が供給された時点で、少なくとも１回行うことで、粉箱２０を振動させることによる、粉箱２０内の粉末密度の均等化が、確実に行われることとなる。なお、粉箱２０の最初の振動のタイミングがこれよりも遅くなると、粉末密度を均等にする効果が弱まることとなる。 Also, at a point before the amount of powder in the powder box 20 reaches a predetermined amount, the powder supply from the sub hopper 16 to the powder box 20 is temporarily interrupted to vibrate the powder box 20, and then the powder supply is resumed. By repeating this step a plurality of times (steps (3) to (5), (8) to (12)), the powder density in the powder box 20 is more reliably equalized before starting the first molding. It becomes possible to do.
Further, by temporarily interrupting the powder supply and vibrating the powder box (step (3)), at least once when the powder is supplied to a predetermined amount of 30 to 60% in the powder box, By equalizing the powder density in the powder box 20 by vibrating the powder box 20, it is ensured. In addition, when the timing of the first vibration of the powder box 20 becomes later than this, the effect of equalizing the powder density will be weakened.

しかも、本発明の実施の形態では、粉箱２０の振動を、粉箱２０から金型２４のキャビティ２６へと粉末を投入する際に、粉箱２０を粉末供給位置Ｐ１から金型上Ｐ２へと移動させるための駆動手段２８によって与えることで、粉箱２０を大きく揺り動かすように振動させることが可能となる。したがって、粉箱２０内に円錐状に堆積される粉末を効果的に崩し、粉箱２０内に均等に堆積させることが可能となる。また、既存の駆動手段２８を有効活用し、装置の複雑化を防ぐことが可能となる。   Moreover, in the embodiment of the present invention, when the powder is fed from the powder box 20 into the cavity 26 of the mold 24, the powder box 20 is moved from the powder supply position P1 to the mold upper P2. It is possible to vibrate the powder box 20 so as to be shaken greatly. Therefore, the powder deposited in a conical shape in the powder box 20 can be effectively broken down and deposited uniformly in the powder box 20. Further, it is possible to effectively utilize the existing driving means 28 and prevent the apparatus from becoming complicated.

なお、粉箱２０の蓋２０ａに設けられた開口を大きくし、サブホッパー１６に対する粉箱２０の位置を、駆動手段２８によって変化させながら粉末供給を行うこととすれば、粉末は粉箱２０内に比較的均等に堆積することとなる。かかる場合には、粉箱２０を振動させる回数を少なくすることが可能となる。   In addition, if the opening provided in the lid 20a of the powder box 20 is enlarged and the powder is supplied while changing the position of the powder box 20 with respect to the sub hopper 16 by the driving means 28, the powder is contained in the powder box 20. It deposits relatively evenly. In such a case, the number of times the powder box 20 is vibrated can be reduced.

本発明の実施の形態に係る粉末投入方法のフローチャートである。It is a flowchart of the powder injection | throwing-in method which concerns on embodiment of this invention. 本発明の実施の形態に係る、粉末投入方法が適用される粉末成形プレスの給粉装置を示す模式図である。It is a schematic diagram which shows the powder supply apparatus of the powder molding press with which the powder injection | throwing-in method based on embodiment of this invention is applied. 本発明の実施の形態に係る粉末投入方法の効果を示すグラフである。It is a graph which shows the effect of the powder injection | throwing-in method which concerns on embodiment of this invention.

符号の説明Explanation of symbols

１０：粉末成形プレスの給粉装置、１２：原料粉ホッパー、１４：粉末秤量機、１６：サブホッパー、１８：シャッター、２０：粉箱、２０ａ：蓋、２２：粉量感知センサー、２４：金型、２６：キャビティー、２８：駆動手段、３０：制御手段、３２：振動式フィーダー、３４：一時貯留容器、３６：重量測定センサー、３８：シャッター、４０：スライドテーブル、４２：粉密度センサー
10: Powder feeding device of powder molding press, 12: Raw material powder hopper, 14: Powder weighing machine, 16: Sub hopper, 18: Shutter, 20: Powder box, 20a: Lid, 22: Powder amount detection sensor, 24: Gold Mold: 26: Cavity, 28: Driving means, 30: Control means, 32: Vibrating feeder, 34: Temporary storage container, 36: Weight measuring sensor, 38: Shutter, 40: Slide table, 42: Powder density sensor

Claims (4)

金型のキャビティ容積を上回る容積を有する粉箱に一時的に粉末を貯留し、該粉箱から金型のキャビティへと粉末を投入して粉末成形を行う粉末投入方法であって、
連続粉末成形工程における最初の成形品のための粉末投入前に、粉箱へと粉末を供給する際、粉箱内の粉量が所定量に至る前の時点で、粉末供給を一時中断して粉箱を振動させるステップと、粉末供給を再開するステップと、粉箱内の粉量が所定量に達した後に、粉箱から成形型へと粉末を投入するステップとを含むことを特徴とする粉末投入方法。 A powder charging method in which powder is temporarily stored in a powder box having a volume exceeding the cavity volume of the mold, and powder molding is performed by charging the powder from the powder box into the mold cavity,
Before supplying the powder for the first molded product in the continuous powder molding process, when supplying the powder to the powder box, the powder supply is temporarily interrupted before the amount of powder in the powder box reaches the predetermined amount. A step of vibrating the powder box, a step of restarting the powder supply, and a step of feeding the powder from the powder box into the mold after the amount of powder in the powder box reaches a predetermined amount. Powder charging method. 粉箱内の粉量が所定量に至る前の時点で、前記粉末供給を一時中断して粉箱を振動させた後、粉末供給を再開するステップを複数回繰り返すことを特徴とする請求項１記載の粉末投入方法。 The step of resuming powder supply is repeated a plurality of times after the powder supply is temporarily interrupted and the powder box is vibrated at a time before the amount of powder in the powder box reaches a predetermined amount. The powder charging method described. 前記粉末供給を一時中断して粉箱を振動させるステップを、粉箱内に所定量の３０〜６０％まで粉末が供給された時点で、少なくとも１回行うことを特徴とする請求項１又は２記載の粉末投入方法。 The step of temporarily interrupting the powder supply and vibrating the powder box is performed at least once when the powder is supplied to 30 to 60% of a predetermined amount in the powder box. The powder charging method described. 前記粉箱の振動を、粉箱から金型のキャビティへと粉末を投入する際に、粉箱を粉末供給位置から金型上へと移動させるための駆動手段によって与えることを特徴とする請求項１から３のいずれか１項記載の粉末投入方法。

The vibration of the powder box is given by driving means for moving the powder box from the powder supply position onto the mold when powder is charged from the powder box into the mold cavity. The powder charging method according to any one of 1 to 3.

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