EP0095513B1 - Vertikal-Druckgussverfahren - Google Patents

Vertikal-Druckgussverfahren 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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English (en)
French (fr)
Other versions
EP0095513A1 (de
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
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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 DE8282104661T priority Critical patent/DE3272131D1/de
Priority to EP82104661A priority patent/EP0095513B1/de
Publication of EP0095513A1 publication Critical patent/EP0095513A1/de
Application granted granted Critical
Publication of EP0095513B1 publication Critical patent/EP0095513B1/de
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. Vertikal-Druckgußverfahren mit den Verfahrensschritten des Verschließens von Anschnittöffnungen (4) zu Formhohlräumen (3) mit einem Gegenkolben (7), nachdem Formteile (1, 2) zusammengespannt worden sind, des Gießens einer Schmelze (15) in einen Behälter (5), wobei ein Druckkolben (9) sich darin in angehobenem Zustand befindet, des Verschiebens des Gegenkolbens (7) zum Öffnen der Anschnittöffnungen (4) und um der Schmelze (15) zu gestatten, infolge der Gravitationskraft durch die Anschnittöffnungen (4) in die Formhohlräume (3) zu fließen, und der anschließenden Druckaufbringung auf die Schmelze (15) in dem Behälter (5) durch Abwärtsbewegen des Druckkolbens (9), um die Formhohlräume (3) mit der Schmelze (15) zu füllen, dadurch gekennzeichnet, daß eine Guß-Steuer-Vorrichtung verwendet wird, daß aufgrund dieser Guß-Steuer-Vorrichtung die Anschnittöffnungen (4) mittels des Gegenkolbens (7) geöffnet werden, nachdem der Druckkolben (9) begonnen hat, sich abwärtszubewegen, und daß die Geschwindigkeit des Druckkolbens in der Zeitspanne vom Beginn seiner Abwärtsbewegung bis zum Öffnen der Anschnittöffnungen (4) auf eine Geschwindigkeit festgesetzt wird, die zwischen der Geschwindigkeit, bei der der Druckkolben (9) die Schmelze (15) in dem Behälter erreichen würde, wenn oder bevor die Anschnittöffnungen (4) mittels des Gegenkolbens (7) geöffnet werden, und der Geschwindigkeit liegt, bei der der Druckkolben (9) die Schmelze (15) zu dem Zeitpunkt erreichen würde, an dem die Schmelze (15) aufhört, allein infolge der Gravitationskraft in die Formhohlräume (3) zu fließen.
2. Vertikal-Druckgußverfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Anschnittöffnungen (4) in der Weise ausgebildet sind, daß das Verhältnis des Volumens der Gußkörper zu der Querschnittsfläche der Anschnittöffnungen (4) 20 bis 40 beträgt (Volumen der Gußkörper (cm3)/Querschnittsfläche (cm2)=20 bis 40), daß der Prozentsatz an Schmelze (15), die allein infolge der Gravitationskraft in die Formhohlräume (3) fließt, auf nicht weniger als 30 festgesetzt ist, daß der Prozentsatz an Schmelze (15), die den Formhohlräumen (3) infolge der Gravitationskraft zugeführt wird, bevor der Druckkolben (9) die Schmelze (15) in dem Behälter (5) erreicht, auf 20 bis 70 festgesetzt wird, daß die Geschwindigkeit der Schmelze (15) durch die Anschnittöffnungen (4) während des Füllens der Formhohlräume (3) infolge der Druckaufbringung mittels des Druckkolbens (9) auf 0,4 bis 0,8 m/sec festgesetzt ist.
3. Vertikal-Druckgußverfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Geschwindigkeit der Schmelze (15) durch die Anschnittöffnungen (4) während der Zuführung der Schmelze (15) zu den Formhohlräumen (3) infolge der Gravitationskraft auf nicht weniger als 0,1 m/sec festgesetzt ist.
EP82104661A 1982-05-27 1982-05-27 Vertikal-Druckgussverfahren Expired EP0095513B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE8282104661T DE3272131D1 (en) 1982-05-27 1982-05-27 Vertical type pressure casting method
EP82104661A EP0095513B1 (de) 1982-05-27 1982-05-27 Vertikal-Druckgussverfahren

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP82104661A EP0095513B1 (de) 1982-05-27 1982-05-27 Vertikal-Druckgussverfahren

Publications (2)

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

Family

ID=8189057

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82104661A Expired EP0095513B1 (de) 1982-05-27 1982-05-27 Vertikal-Druckgussverfahren

Country Status (2)

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EP (1) EP0095513B1 (de)
DE (1) DE3272131D1 (de)

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 (en) * 1992-07-23 1994-02-03 Papervision Limited A moulding device
JPH07509407A (ja) * 1992-07-23 1995-10-19 ハイテク・メタルズ・リミテッド 成形装置
GB2299534B (en) * 1994-02-18 1998-04-22 New Pro Foundries Limited Metal composite casting method
GB2286786A (en) * 1994-02-18 1995-08-30 New Pro Foundries Limited Metal composite casting
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 (de) 1983-12-07

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