EP0095513B1 - Procédé de coulée sous pression de type vertical - Google Patents

Procédé de coulée sous pression de type vertical Download PDF

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Publication number
EP0095513B1
EP0095513B1 EP82104661A EP82104661A EP0095513B1 EP 0095513 B1 EP0095513 B1 EP 0095513B1 EP 82104661 A EP82104661 A EP 82104661A EP 82104661 A EP82104661 A EP 82104661A EP 0095513 B1 EP0095513 B1 EP 0095513B1
Authority
EP
European Patent Office
Prior art keywords
melt
gates
cavities
plunger tip
gravity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP82104661A
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German (de)
English (en)
Other versions
EP0095513A1 (fr
Inventor
Toshika Masaoka
Atsushi Ota
Masaaki Tokui
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Motor Corp
Original Assignee
Toyota Motor Corp
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.)
Filing date
Publication date
Application filed by Toyota Motor Corp filed Critical Toyota Motor Corp
Priority to EP82104661A priority Critical patent/EP0095513B1/fr
Priority to DE8282104661T priority patent/DE3272131D1/de
Publication of EP0095513A1 publication Critical patent/EP0095513A1/fr
Application granted granted Critical
Publication of EP0095513B1 publication Critical patent/EP0095513B1/fr
Expired legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/08—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled
    • B22D17/12—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled with vertical press motion

Definitions

  • the present invention relates to a vertical type pressure casting method according to the pre-characterizing portion of claim 1.
  • Such a casting method is disclosed in EP-A-0085726, published 17.8.83.
  • cast products of a light alloy such as aluminum alloy have generally been manufactured by gravity casting, low-pressure casting and pressure die casting.
  • the sleeve-charging percentage is 50-70, and, moreover, the melt is introduced into cavities under pressure at a high rate. Accordingly, the gas in certain portions of the passage for the melt, such as gates, and in the cavities is liable to mix with the melt, decreasing the reliability of the quality of the products.
  • Figure 1 shows a vertical type pressure casting apparatus used in the method according to the present invention.
  • a lower mold 1 and an upper mold 2 are clamped together to form cavities 3.
  • Gates 4 for the cavities 3 face the interior of a sleeve 5.
  • a counter-tip 7 connected to a hydraulic cylinder 6, and a plunger tip 9 connected to a hydraulic cylinder 8 are provided opposing each other in lower and upper positions, respectively, in the sleeve 5 such that the counter-tip 7 and plunger tip 9 can be moved up and down therein.
  • a solenoid in a changer-over valve 10 connected to hydraulic cylinder 6 is controlled by a limit switch 12 with respect to a dog 11 provided on the rod of plunger tip 9.
  • the melt 15 is poured from a melt inlet port 13 into the sleeve 5 by a ladle 14.
  • the above apparatus is designed so that the ratio of the volume (cm 3 ) of the product to the cross-sectional area (cm 2 ) of the gates 4, which is one of the construction parameters of the apparatus, is 20-40.
  • the operational conditions and a program device for the present invention to be practiced by using the apparatus of this construction are set to attain the following:
  • the plunger tip 9 is moved downward to lower the counter-tip 7 through the dog 11 and limit switch 12.
  • the relation between the speed V[m/secl at which the plunger tip 9 moves downward and the length of time T[sec] from the commencement of the downward movement of the plunger tip 9 to the opening of the gates 4 by the counter-tip 7, is set to an optimal value with reference to the information shown in Figure 5.
  • the speed, at which the plunger tip 9 moves down is set to a level between the upper limit level in an upper limit speed curve R 1' above which the plunger tip 9 moves down too fast and reaches the upper surface of the melt 15 in the sleeve 5 to start the pressure-filling operation before the gates 4 have been opened by the counter-tip 7, and a lower limit level in a lower limit speed curve R 2 , above which the plunger tip 9 reaches the upper surface of the melt 15 in the sleeve 5 after the gates 4 have been fully opened by the counter-tip 7 allowing the melt 15 to flow into the cavities 3 by the force of gravity until the flow of melt 15 has stopped, whereby the melt 15 can be fed to the cavities 3 calmly and continuously at a low rate.
  • This relation between the speed of the plunger tip 9 and the length of a period of time between the commencement of the downward movement of the plunger tip 9 and the opening of the gates 4 can also be set differently by varying not only the cross-sectional area of the gates 4 but also the temperatures of the molds 1, 2 and melt 15.
  • the percentage of the melt 15 to be fed into the cavities 3 by the force of gravity before the plunger tip 9 reaches the upper surface of the melt 15 in the sleeve 5 is set to 20-70, and the speed of the melt 15 through the gates 4 during the feeding of the melt 15 to the cavities 3 by the force of gravity is set to not less than 0.1 m/sec with the speed of the melt 15 through the gates 4 when pressure-filling the cavities 3 using the plunger tip 9 set to 0.4-0.8 m/sec.
  • the molds 1, 2 are clamped as shown in Figure 1 with the casting apparatus set in accordance with the above-mentioned casting conditions and the program device, and the hydraulic cylinder 6 ' is actuated to close the gates 4 with the counter-tip 7. The hydraulic cylinder 8 is then actuated to set the plunger tip 9 to an initial attitude position.
  • a predetermined amount of melt 15 is then poured from the melt inlet port 13 into the sleeve 5, and a button for a control unit (not shown) is pressed to actuate the hydraulic cylinder 8 to start the casting operation.
  • the counter-tip 7 is moved downward at a predetermined time by operation of the changeover valve 10 before the plunger tip 9 has reached the upper surface of the melt 15 in the sleeve 5 as shown in Figure 2, in accordance with the relation between the set speed and time shown in Figure 5, to open the gates 4.
  • the melt 15 then starts flowing from the gates 4 into the cavities 3 by the force of gravity.
  • the plunger tip 9 After a predetermined period of time has passed, the plunger tip 9 reaches the upper surface of the melt 15 (which is, of course, flowing into the cavities 3 by the force of gravity) in the sleeve 5. At this time, the percentage of the melt 15 placed in the cavities 3 is 20-70 as mentioned above.
  • the melt-feeding by the force of gravity is then changed to pressure-filling as shown in Figure 4.
  • the speed of the melt 15 through the gates 4 during pressure-filling by the plunger tip 9 is set to 0.4-0.8 m/sec as mentioned above.
  • the melt 15 in the sleeve 5 is fed into the cavities 3 by its own weight, i.e. by the force of gravity, in the initial stage, and under pressure by the plunger tip 9 before the gravity-feeding operation has finished. Since this casting operation is conducted in accordance with the above-mentioned numerically limited conditions, the melt 15 fills the cavities 3 relative calmly and continuously at a low rate without permitting gas to enter the melt 15.
  • the melt 15 flows into the cavities 3 by its own weight too quickly, or the gravity-feeding time becomes short, so that the optimum range is narrow.
  • this ratio exceeds 40, the injection of the melt 15 into the cavities 3 by the force of gravity progresses too slowly, and the percentage of melt 15 put in the cavities 3 by the force of gravity becomes low, so that the melt 15 which has passed through the gates 4 is disordered, causing gas to mix the melt 15 and cold shut to occur.
  • the melt 15 When a gravity-feeding operation is shifted to a pressure-filling operation, the melt 15 should be placed in the cavities 3 relative smoothly, quietly, at a low rate, and in a continuous manner.
  • a gravity-feeding percentage When the percentage of the melt 15 which flows into the cavities 3 by the force of gravity, a gravity-feeding percentage, is lower than 20, the pressure-filling operation starts too early. When this percentage exceeds 70, the gravity-feeding operation is carried out excessively. Therefore, in either of these cases, the gravity-feeding operation cannot be shifted to the pressure-filling operation immediately and smoothly, so that gas mix the melt 15 and cold shut occurs.
  • this casting apparatus is designed so that, a pressure-filling operation is not conducted during a gravity-feeding operation only, i.e. the melt 15 flows into the cavities 3 by only the force of gravity, a percentage of melt 15 to be placed in the cavities 3 by the force of gravity is set to at least 30 and then pressure filling is conducted supplementarily.
  • a percentage of melt 15 to be placed in the cavities 3 by the force of gravity is set in this manner, gas can be prevented from entering the melt 15.
  • the casting conditions can be set or determined easily, and the time and cost for conducting experiments and modifying the metal molds can be reduced to a remarkable extent.
  • the gates 4 are formed in such a manner that a ratio of volume (cm 3 ) of products to a cross-sectional area of the gates (cm 2 ) is 20-40, gas does not mix in the melt 15, and no cold shut occurs. Therefore, faultless products can be obtained.
  • the speed at which the plunger tip 9 is moved down until the counter-tip 7 is displaced to open the gates 4 is set to an optimum level which makes the plungertip 9 to reach the upper surface of the melt 15 in the sleeve 5 between the time the melt 15 starts flowing into the cavities 3 by the force of gravity, and the time, at which the gravity-feeding of the melt 15 is finished. Accordingly, a very high percentage of satisfactory products can be obtained.
  • the speed of the melt 15 through the gates 4 during the pressure-filling operation is set to 0.4-0.8 m/sec, gas does not enter the cavities 3, and the melt 15 can be put into the cavities 3 in a desired manner as mentioned above.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Claims (3)

1. Un procédé de moulage vertical sous pression comportant les étapes suivantes:
- Fermer des trous de coulée (4) débouchant dans des cavités (3) par une tête de plongeur antagoniste (7) après avoir assemblé les parties d'un moule (1, 2), on coule un matière fondue (15) dans un alésage (5) pendant qu'une tête de plongeur (9) se trouve en position haute dans cet alésage, on déplace ladite tête de plongeur antagoniste (7) pour ouvrir lesdits trous de coulée (4) et permettre à la matière fondue (15) de couler dans lesdites cavités (3) en traversant lesdits trous de coulée (4) par la force de gravité, puis on met sous pression la matière fondue (15) dans ledit alésage (5) en déplaçant ladite tête de plongeur (9) vers le bas, afin de remplir lesdites càvités (3) de matière fondue (15) caractérisé en ce qu'il consiste à utiliser un dispositif de programmation de moulage qui contrôle l'ouverture des trous de coulée (4) par l'intermédiaire de la tête de plongeur antagoniste (7) lorsque ladite tête de plongeur (9) a commencé à descendre;
- Ajuster la vitesse de ladite tête de plongeur (9) pendant la période entre le commencement de son mouvement descendant et l'ouverture desdits trous de coulée (4) à une valeur comprise entre la vitesse à laquelle ladite tête de plongeur (9) atteindrait de matière fondue (15) dans ledit alésage (5) au moment de l'ouverture ou avant l'ouverture desdits trous de coulée (4) par la tête de plongeur antagoniste (7) d'une part, et la vitesse à laquelle ladite tête de plongeur (9) atteindrait la matière fondue (15) au moment où l'écoulement de la matière fondue (15) dans les cavités (3) par la seule force de gravité est terminé d'autre part.
2. Un procédé de moulage vertival sous pression selon la revendication 1, dans lequel les trous de coulée (4) présentent une configuration telle que le rapport du volume de pièces à la surface de section desdits trous de coulée (4) soit de 20-40 (volume de pièces en cm3 à la surface de section en cm2=20-40), la proportion de matière fondue (15) s'écoulant dans les cavités (3) par le seule force de gravité étant ajustée à une valeur non inférieure à 30%, la proportion de matière fondue (15) introduite dans les trous de coulée (3) par la force de gravité avant que ladite tête de plongeur (9) n'atteigne la matière fondue (15) dans ledit alésage (5) étant adjustée à une valeur comprise entre 20 et 70%, et la vitesse d'écoulement de la matière fondue (15) à travers les trous de coulée (4) au cours de son injection dans lesdites cavités (3) par ladite tête de plongeur (9) étant adjustée à une valeur comprise entre 0,4 et 0,8 m/s.
3. Un procédé de moulage vertical sous pression selon la revendication 1 ou 2, caractérisé en ce que la vitesse d'écoulement de la matière fondue (15) à travers les trous de coulée (4) au cours de l'introduction de la matière fondue (15) dans lesdits cavités (3) par la force de gravité est ajustée à une valeur non inférieure à 0,1 m/s.
EP82104661A 1982-05-27 1982-05-27 Procédé de coulée sous pression de type vertical Expired EP0095513B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP82104661A EP0095513B1 (fr) 1982-05-27 1982-05-27 Procédé de coulée sous pression de type vertical
DE8282104661T DE3272131D1 (en) 1982-05-27 1982-05-27 Vertical type pressure casting method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP82104661A EP0095513B1 (fr) 1982-05-27 1982-05-27 Procédé de coulée sous pression de type vertical

Publications (2)

Publication Number Publication Date
EP0095513A1 EP0095513A1 (fr) 1983-12-07
EP0095513B1 true EP0095513B1 (fr) 1986-07-23

Family

ID=8189057

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82104661A Expired EP0095513B1 (fr) 1982-05-27 1982-05-27 Procédé de coulée sous pression de type vertical

Country Status (2)

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EP (1) EP0095513B1 (fr)
DE (1) DE3272131D1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2283445B (en) * 1992-07-23 1996-03-06 Hi Tec Metals Ltd A moulding device
CA2140784A1 (fr) * 1992-07-23 1994-02-03 Papervision Limited Dispositif de moulage
AU665015B2 (en) * 1992-07-23 1995-12-14 Papervision Limited A moulding device
GB2286786A (en) * 1994-02-18 1995-08-30 New Pro Foundries Limited Metal composite casting
GB2299534B (en) * 1994-02-18 1998-04-22 New Pro Foundries Limited Metal composite casting method
ES2774396B2 (es) * 2020-02-28 2021-07-07 Diepress Tech S L U Equipo de inyeccion para la fabricacion de piezas metalicas en molde y proceso de inyeccion para dicha fabricacion

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2705607C3 (de) * 1977-02-10 1981-04-09 Ube Industries, Ltd., Ube, Yamaguchi Vertikale Druckgießmaschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan, vol. 6, no. 45, 20 March 1982 *

Also Published As

Publication number Publication date
DE3272131D1 (en) 1986-08-28
EP0095513A1 (fr) 1983-12-07

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