WO2017038236A1 - Dispositif de moulage de poudre et procédé de remplissage de poudre - Google Patents

Dispositif de moulage de poudre et procédé de remplissage de poudre Download PDF

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Publication number
WO2017038236A1
WO2017038236A1 PCT/JP2016/069642 JP2016069642W WO2017038236A1 WO 2017038236 A1 WO2017038236 A1 WO 2017038236A1 JP 2016069642 W JP2016069642 W JP 2016069642W WO 2017038236 A1 WO2017038236 A1 WO 2017038236A1
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Prior art keywords
powder
feeding box
powder feeding
cavity
molding machine
Prior art date
Application number
PCT/JP2016/069642
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English (en)
Japanese (ja)
Inventor
小菅　敏行
鍛冶　俊彦
Original Assignee
住友電工焼結合金株式会社
Priority date (The priority date 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 date listed.)
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Publication date
Application filed by 住友電工焼結合金株式会社 filed Critical 住友電工焼結合金株式会社
Priority to JP2017537614A priority Critical patent/JP6693620B2/ja
Publication of WO2017038236A1 publication Critical patent/WO2017038236A1/fr

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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

Definitions

  • the present invention relates to a powder molding machine and a powder filling method.
  • This application claims priority based on Japanese Patent Application No. 2015-172915 filed on September 2, 2015, and incorporates all the content described in the above Japanese application.
  • Patent Documents 1 and 2 below disclose that a powdering box is vibrated with a vibration generator (vibration generator) to vibrate the powdering box when the powder is charged.
  • a vibration generator vibration generator
  • a powder molding machine has a mold having a cavity formed therein, a die plate that holds the mold, and a lower outlet that has the same shape as the upper inlet shape of the cavity, and is installed on the die plate.
  • FIG. 1 is a sectional view showing the important section of the powder molding machine concerning an embodiment.
  • FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1 of the powder feeding box according to the embodiment.
  • FIG. 3 is a cross-sectional view of a state in which the powder supply box is disposed on the cavity.
  • FIG. 4 is a plan view of the powder supply box of FIG.
  • FIG. 5 is a partially broken enlarged plan view of the engaging portion of the powder feeding box and the drive lever of the drive mechanism according to the embodiment.
  • the powder molding machine includes a powder feeding box that moves from a standby position to a powder charging position and charges raw material powder (hereinafter simply referred to as powder) into a mold cavity.
  • the powder is supplied from the powder feeding box into the cavity by natural fall, but this method is concerned about the phenomenon that the powder forms an arch structure, and the variation in packing density due to the so-called bridge. .
  • Patent Documents 1 and 2 propose to attach a vibrator (vibration generator) to the powder feeding box to vibrate the powder feeding box when the powder is charged.
  • the powder molding machine (powder press apparatus) described in Patent Document 1 is provided with a sieve at the bottom of the powder feeding box, and the powder to be put into the cavity is put through the sieve so that it is difficult to cause bridging and uneven feeding. It is to suppress.
  • the powder molding machine described in Patent Document 2 divides the lower inner side of the powder feeding box into a plurality of rooms by vertical and horizontal partition plates, and vibrates the powder feeding box when the powder is charged into the cavity. Vibration is propagated to the charged powder via the partition plate to break the bridge generated in the charged powder.
  • Expansion of the air contained in the bag also occurs when the molded body is heat-treated, and the molded body may be damaged or deformed (expanded) during the heat treatment.
  • Patent Document 1 simply sifts the powder to be charged and allows it to fall spontaneously, so that the effect of rearranging the powder cannot be obtained, and the amount of air inclusion increases.
  • a dust core (a dust core) employed in a motor, a reactor, or the like is desired to increase the molding density as much as possible by applying a high molding pressure in order to obtain better magnetic properties.
  • a high molding pressure in order to obtain better magnetic properties.
  • an object of the embodiment of the present invention is to provide a powder molding machine and a powder filling method capable of realizing high density filling of powder into a cavity by reducing the amount of powder contained in the air.
  • a powder molding machine has a mold having a cavity formed therein, a die plate that holds the mold, and a lower outlet that has the same shape as the upper inlet shape of the cavity, and is installed on the die plate.
  • the powder filling method according to one aspect of the present invention is such that the powder box of the powder molding machine according to one aspect of the present invention described above is vibrated in the vertical direction by the vibrator and the powder in the powder box is tapped.
  • the powder molding machine includes a mold, a die plate that holds the mold, and a powder feeding box that moves on the die plate.
  • the mold includes a die, a punch, and a core rod that is additionally provided as necessary.
  • the powder feeding box moves on the die plate from the standby position toward the powder charging position, and charges powder into the die cavity at the powder charging position.
  • the powder feeding box has a lower outlet having the same shape as the upper inlet shape of the cavity, and a vibrator (vibration applying device) that vibrates the powder feeding box in the vertical direction and the lower outlet of the powder feeding box. It has a shutter that opens and closes.
  • to vibrate in the vertical direction means to vibrate in a direction parallel to the axis of the cavity.
  • the powder feeding box having a lower outlet having the same shape as the upper inlet shape of the cavity is a powder feeding box having a lower outlet having the same planar shape or similar shape as the planar contour shape of the upper inlet of the cavity.
  • the shape of the upper entrance of the cavity in a plan view is a ring shape
  • the lower outlet of the powder feed box is a ring shape.
  • the size of the lower outlet of the powder feeding box may be equal to the size of the inlet of the cavity, but rather than that, considering the amount of spring back when the tap density powder escapes from the powder feeding box.
  • a size smaller than the size of the upper entrance of the cavity is preferable.
  • the tap density is a density in a state in which the container is vibrated after the powder is put in the container and the volume of the powder is not further reduced.
  • the measuring method is based on ISO 3953: 2011.
  • the powder feeding box is vibrated by the shaker with the shutter closed.
  • the supply of powder to the powdering box and the vibration of the powdering box by the vibrator may be performed on the powdering box moved to a standby position, You may make it when it exists in the arbitrary positions of a movement area
  • Vibrating the powder feeding box may be performed at any time before the start of powder charging into the cavity. By vibrating the powdering box, vertical vibration is applied to the powder charged in the powdering box, and the rearrangement of the powder in the powdering box is forced and effective by the vibration. .
  • the powder in the powder feeding box has a tap density and is then put into the cavity. Since the lower outlet of the powder feeding box has the same shape as the upper inlet of the cavity, the powder having the tap density is charged without being cut.
  • the amount of air contained in the powder filled in the cavity is reduced, and the resulting molded body is prevented from being damaged or deformed (swelled during heat treatment) due to the contained air even if it has a high density.
  • the powder filling density with respect to the volume of the cavity is higher than that of the conventional powder molding machine by introducing the powder having the tap density.
  • the total length of the die can be shortened by reducing the volume of the powder to be filled. Accordingly, the overall length of the upper and lower punches can be shortened to reduce punch distortion during molding, leading to improved molding accuracy.
  • the side wall of the powder feeding box has a taper angle (this is called a reverse taper angle) at which the upper space is narrowed. More preferably, a reverse taper angle larger than the amount of spring back of the powder having a tap density is provided to make it difficult for friction resistance when the powder is put into the cavity.
  • a preferable reverse taper angle is 0.05 ° to 1 °.
  • the reverse taper angle is 0.05 ° or less, the effect of reducing the frictional resistance when powder is introduced into the cavity is thin, and when the reverse taper angle is about 1 °, the effect is saturated.
  • the size of the lower outlet of the powder feeding box should be slightly smaller than the size of the upper inlet of the cavity (preferably to the extent that a sliding gap is ensured between the powder and the cavity). In the case of these treatments, the powder is smoothly put into the cavity from the powder feeding box.
  • the difference between the size of the lower outlet and the size of the upper inlet is preferably 0.01 mm to 1.0 mm in the radial direction.
  • a drive mechanism for moving the powder feeding box is installed on the die plate. More preferably, the drive mechanism has a drive lever connected to the powdering box, and the connection between the drive lever and the powdering box is allowed to move in the vertical direction and the relative movement in the push-pull direction is limited. ing. More preferably, the drive mechanism includes a connector having a vertically extending slot installed in the powder feeding box and a drive lever inserted into the slot.
  • the powder feeding box Since the powder feeding box is not restrained in the vertical direction, the powder feeding box can vibrate up and down without receiving the load of the drive mechanism and the drive lever.
  • the powder feeding box provided with the shutter that opens and closes the vibrator and the lower outlet is vibrated in the vertical direction by the vibrator, so The powder is filled into the cavity through a step of bringing the powder into a tap density and then a step of opening the shutter at the lower part of the powder feeding box and putting the powder of the tap density into the cavity of the mold.
  • the powder may be charged into the cavity from the powder feeding box by either dropping powder feeding or suction powder feeding.
  • the dropping powder feeding is a method in which powder is fed from the powder feeding box into the cavity in which a predetermined volume is formed.
  • the suction powder feeding is the following powder feeding method. First, the die is lowered until the upper surface of the die and the upper end of the lower punch are aligned. Next, the volume is increased while the die is raised, and at the same time, powder is put into the cavity from the powder feeding box. According to the suction feeding, the effect of high-density filling is exhibited by the above-described action.
  • the powder put into the cavity can be worn out by the die and the powder feeding box that returns to the standby position after the powder is put.
  • the lower outlet is closed with the shutter in contact with the upper surface of the die, and the shutter is scraped off.
  • a powder molding machine is similar to a die having an inner peripheral surface that cuts through vertically, a core rod inserted into the die, a die plate that holds the die, and an inner peripheral surface shape of the die.
  • a bottom outlet having a shape and a cylinder similar to the shape of the outer peripheral surface of the core rod, a powder feeding box installed on a die plate, a vibrator connected to the powder feeding box and vibrating in the vertical direction,
  • a shutter installed at the lower outlet of the powder feeding box, a connector having a vertically extending slot installed in the powder feeding box, and a drive lever inserted into the slot.
  • the powder molding machine 1 shown in FIG. 1 is configured by combining a die 2, an upper punch 3, a lower punch 4, a core rod 5, a powder feeding box 6 and a vibration exciter 7 that constitute a mold.
  • the die 2 is supported by the die plate 8.
  • the upper punch 3 is supported by an upper punch plate 9 driven by an upper ram (not shown) of the press machine, and the lower punch 4 is supported by a base plate 10.
  • the die plate 8 is connected via a connecting rod 12 to a yoke plate 11 driven by a lower ram (not shown) of the press machine.
  • the upper surface of the die 2 supported by the die plate 8 can be lowered until the position of the upper end of the lower punch 4 is aligned by driving the yoke plate 11.
  • the saddle cavity 13 is formed by the inner peripheral surface 24 of the die 2, the upper end of the lower punch 4, and the outer peripheral surface 25 of the core rod 5.
  • the powder feeding box 6 has a shape in plan view of the lower outlet 23 similar to the shape of the upper inlet 22 of the cavity 13 (that is, the inner contour and the outer side of the powder molding machine shown in the figure). Are provided with a concentric circular shape).
  • the size of the lower outlet 23 is set 0.5 mm smaller than the inner peripheral surface 24 in the radial direction.
  • the side wall 6 a of the powder feeding box 6 is provided with an inverse taper angle ⁇ that narrows the upper interval.
  • the reverse taper angle ⁇ is set to about 0.05 ° to 1 °.
  • the reverse taper angle ⁇ is 0.05 ° or less, the effect of reducing the frictional resistance when the powder is charged into the cavity 13 is thin, and when the reverse taper angle ⁇ is about 1 °, the effect is saturated.
  • a shutter 14 formed of a thin flat plate that opens and closes the powder lower outlet 23 is provided at the lower portion of the powder supply box 6.
  • the actuator 15 that drives the shutter 14 is attached to the powder feeding box 6 and moves on the die plate 8 together with the powder feeding box 6.
  • the drive lever 16 a of the drive mechanism 16 installed on the die plate 8 is connected to the rear of the side wall 6 a of the powder feeding box 6. The movement from the standby position on the die plate 8 to the powder charging position on the cavity 13 and the return from the powder charging position to the standby position are performed by advancing and retracting the drive lever 16a.
  • the powder feeding box 6 is a box having an open upper end, and is pushed by the drive lever 16a to slide on the die plate 8, from the standby position to the powder feeding position. Move towards.
  • the said powder supply box 6 has the cylinder 6c extended in an up-down direction.
  • the cylinder 6c is supported by the side wall 6a of the powder feeding box 6 via a support pin 6b at a position corresponding to the core rod 5.
  • the cylinder 6 c has an upper surface and a side surface 26.
  • the cylinder may have a lower surface.
  • the outer peripheral shape of the lower end of the side surface 26 is similar to the shape of the outer peripheral surface 25 of the upper end of the core rod 5.
  • the size of the lower end of the side surface 26 is set 0.5 mm larger than the outer peripheral surface 25 in the radial direction.
  • the powder molding machine 1 is a molding machine using an NC servo press, and when the powder feeding box 6 is in the standby position, a fixed amount of powder is supplied from the hopper 17 at the top to the powder feeding box 6.
  • the powder molding machine 1 attaches the vibration exciter 7 to the outer surface of the side wall 6 a of the powder feeding box 6, and vibrates the powder feeding box 6 up and down with the vibration exciter 7.
  • the vibrator 7 may be a commercially available linear vibration type air vibrator.
  • the drive lever 16a is connected to the powder feeding box 6 so that the load of the lever is not applied so as not to hinder vibrations by the vibrator 7.
  • a connecting tool 18 is attached to the rear part of the powder feeding box 6.
  • a vertical movement of the T-shaped head portion 20 provided in the drive lever 16a with respect to the powder feeding box 6 is allowed to move in a vertical direction in a T-shaped slot 19 extending in the vertical direction provided in the connector.
  • the relative movement in the push-pull direction is coupled so as to be limited. Therefore, the powder supply box 6 can vibrate up and down without receiving the load of the drive lever 16a.
  • the coupler 18 is provided with a ball plunger 21 that contacts the surface of the head portion 20 and guides the powder feeding box 6 with reduced sliding resistance in the vertical movement.
  • the powder feeding box 6 When the supply is completed, the powder feeding box 6 is vibrated in the vertical direction by the vibrator 7 with the shutter 14 closed.
  • the powder feeding box 6 may be vibrated when it is in the standby position, or may be vibrated while the powder feeding box 6 is moving toward the powder charging position. Although it is possible to vibrate after moving to the powder charging position, if the vibration is completed before reaching the powder charging position, the time required for the molding process is reduced.
  • the shutter 14 is opened to open the powder. Is put into the cavity 13.
  • This charging is done either by dropping powder feeding or suction powdering. Since the reverse taper angle ⁇ is attached to the side wall 6a of the powder supply box 6, the powder can be smoothly introduced into the cavity 13 by any of the powder supply methods.
  • the powder is scraped off by the shutter 14. Specifically, the powder is scraped off by closing the shutter 14 in contact with the upper surface of the die 2. Thereby, the powder protruding from the cavity 13 is separated from the powder in the cavity 13.
  • the powder feeding box 6 moves to the standby position, the powder can be scraped off by the side wall 6a on the front side of the powder feeding box 6.
  • the powder is scraped off by the shutter 14
  • the powder remaining in the powder feeding box 6 is received by the shutter 14 and the residual powder does not fall into the cavity 13. It is more preferable with respect to uniform density.
  • the powder feeding box 6 Since the lower outlet 23 has the same shape as the upper inlet 22 of the cavity 13, the powder feeding box 6 is charged with the powder having the tap density into the cavity 13 without collapsing. A new mixing situation is avoided.
  • the powder supply to the powder feeding box 6 can be performed by connecting the powder feeding box 6 and the hopper (not shown) as a powder supply source via a hose.
  • the method of supplying powder to the powder feeding box 6 at the standby position is preferable to this method because the powder is less likely to be biased in the powder feeding box 6.
  • the powder feeding box 6 slides on the die plate 8 and returns to the standby position. Thereafter, the upper punch 3 is lowered and the powder in the cavity 13 is pressure-molded.
  • Example 1 The results of the evaluation test of the powder molding machine and powder filling method of the present invention are shown below. The evaluation test was performed using three kinds of powders shown in Table 1. Table 1 shows the density and the ratio of each density to the familiarity.
  • the powder molding machine has a powder feeding box having a rectangular outlet in plan view larger than the inlet shape of the cavity, and the same shape as the shape of the upper inlet of the cavity in plan view (this is the product shape) The one having the outlet of the above is used.
  • powdering is performed in three patterns: no vibration of the powdering box, left-right vibration, and vertical vibration, depending on the presence or absence of vibration and the difference in vibration direction. The effect was investigated.
  • the powder A was unlubricated, and the powders B and C were formed after a solution (lubricant) in which zinc stearate was dissolved in alcohol was applied to the mold by spraying.
  • the powder was introduced into the cavity by suction powder feeding while raising the die lowered until the positions of the upper surface of the die and the upper end of the lower punch were aligned.
  • the coaxiality (vibration) between the outer peripheral surface and the inner peripheral surface of the molded body is remarkably increased when the vertical vibration of the powder feeding box, the application of reverse taper to the side wall of the box, and the scraping of the charged powder by the shutter are used together.
  • Example 2- The molded bodies of Nos. 9 to 23 in Example 1, including those in which swelling occurred, were heated to 250 ° C., and the occurrence of deformation or breakage after heating was examined. The results are shown in Table 2 as X, Y, and Z.
  • X is one in which no blistering occurs in 30 pieces
  • Y is a piece in which blistering has occurred and a molded product is missing, and less than 10 pieces in 30 pieces.
  • Z is formed with blistering. What lacked the body was 10 or more out of 30.
  • chipping of the compact does not occur when the vertical vibration of the dusting box, the application of a reverse taper to the side wall of the box, and the scraping of the charged powder by the shutter are used together.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)

Abstract

L'invention concerne un dispositif de moulage de poudre comprenant : un moule dans lequel une cavité est formée ; une plaque de matrice supportant le moule ; une boîte d'alimentation en poudre disposée sur la plaque de matrice et ayant une sortie inférieure ayant la même forme qu'une entrée supérieure de la cavité ; des générateurs de vibrations qui sont reliés à la boîte d'alimentation en poudre et qui amènent la boîte d'alimentation en poudre à vibrer vers le haut et vers le bas ; et un obturateur installé dans la sortie inférieure de la boîte d'alimentation en poudre.
PCT/JP2016/069642 2015-09-02 2016-07-01 Dispositif de moulage de poudre et procédé de remplissage de poudre WO2017038236A1 (fr)

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JP2017537614A JP6693620B2 (ja) 2015-09-02 2016-07-01 粉末成形機と粉末充填方法

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JP2015-172915 2015-09-02
JP2015172915 2015-09-02

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109049820A (zh) * 2018-10-13 2018-12-21 河南黄河田中科美压力设备有限公司 振动筛布料的粉料压机
CN109570505A (zh) * 2018-12-26 2019-04-05 深圳市圆梦精密技术研究院 金属粉末供料装置及3d打印机
KR20200000053A (ko) * 2018-06-22 2020-01-02 한국생산기술연구원 상하 더블 액션 구현을 가능하게 하는 금형 시스템
CN115533128A (zh) * 2022-10-28 2022-12-30 哈尔滨理工大学 一种基于粉末冶金的slm金属3d打印机

Citations (4)

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Publication number Priority date Publication date Assignee Title
JPH0368991U (fr) * 1989-10-26 1991-07-08
JPH10314994A (ja) * 1997-05-22 1998-12-02 Nissan Motor Co Ltd 圧粉体成形装置の粉末供給装置
JP2001179497A (ja) * 1999-12-24 2001-07-03 Seiko Epson Corp 粉体充填装置及び粉体充填方法並びに圧粉成形装置
JP2007196244A (ja) * 2006-01-24 2007-08-09 Tdk Corp 粉末充填装置及び粉末充填方法、並びに成形装置、成形方法、希土類焼結磁石の製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0368991U (fr) * 1989-10-26 1991-07-08
JPH10314994A (ja) * 1997-05-22 1998-12-02 Nissan Motor Co Ltd 圧粉体成形装置の粉末供給装置
JP2001179497A (ja) * 1999-12-24 2001-07-03 Seiko Epson Corp 粉体充填装置及び粉体充填方法並びに圧粉成形装置
JP2007196244A (ja) * 2006-01-24 2007-08-09 Tdk Corp 粉末充填装置及び粉末充填方法、並びに成形装置、成形方法、希土類焼結磁石の製造方法

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200000053A (ko) * 2018-06-22 2020-01-02 한국생산기술연구원 상하 더블 액션 구현을 가능하게 하는 금형 시스템
KR102131149B1 (ko) 2018-06-22 2020-07-07 한국생산기술연구원 상하 더블 액션 구현을 가능하게 하는 금형 시스템
CN109049820A (zh) * 2018-10-13 2018-12-21 河南黄河田中科美压力设备有限公司 振动筛布料的粉料压机
CN109570505A (zh) * 2018-12-26 2019-04-05 深圳市圆梦精密技术研究院 金属粉末供料装置及3d打印机
CN109570505B (zh) * 2018-12-26 2023-08-04 深圳市圆梦精密技术研究院 金属粉末供料装置及3d打印机
CN115533128A (zh) * 2022-10-28 2022-12-30 哈尔滨理工大学 一种基于粉末冶金的slm金属3d打印机

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