EP0901852B1 - Plunger for a hot-chamber die-casting machine - Google Patents
Plunger for a hot-chamber die-casting machine Download PDFInfo
- Publication number
- EP0901852B1 EP0901852B1 EP19970810643 EP97810643A EP0901852B1 EP 0901852 B1 EP0901852 B1 EP 0901852B1 EP 19970810643 EP19970810643 EP 19970810643 EP 97810643 A EP97810643 A EP 97810643A EP 0901852 B1 EP0901852 B1 EP 0901852B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- sealing ring
- casting cylinder
- slot
- casting machine
- 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 - Lifetime
Links
Images
Classifications
-
- 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
- B22D17/20—Accessories: Details
- B22D17/2015—Means for forcing the molten metal into the die
- B22D17/203—Injection pistons
Definitions
- the present invention relates to an axially displaceable piston for use in a Casting cylinder of a die casting machine with a piston groove for receiving the ring land a sealing ring provided with a slot, the slot as a step slot is formed, the slot surfaces extending in the circumferential direction and in Sealing step transition surfaces which can be displaced relative to one another in the circumferential direction form.
- At least two ring segments are loosely arranged in the ring groove, which are during the working stroke of the piston through the liquid metal flowing through the channels to the inner jacket of the casting cylinder are pressed and thus act as a sealing ring.
- liquid metal is also between the piston and The casting cylinder can penetrate towards the piston rod and solidify with the possible destruction of pistons and casting cylinders; in addition, the manufacture of the Pistons extremely complicated and expensive.
- a piston for a casting cylinder of a cold chamber die casting press is known, in which a cap with an annular groove through which a coolant flows is arranged.
- a slot-shaped sealing ring engages in the ring groove, wherein the slot is designed as a step slot, the slot surfaces in Sealing step transition surfaces running circumferentially and displaceable in the circumferential direction form.
- the cap ends in an approach that successively the annular groove, has an annular web and a boundary surface, the sealing ring with its Ring web and its ring groove accordingly in the ring groove and in the ring web of Approaches and with its boundary surface the ring web of the approach comprising radially opposite the boundary surface of the approach from the front
- tests have shown that such a piston can be used in one Casting cylinder of a hot chamber die casting machine is unsuitable.
- the invention is therefore based on the object of avoiding the disadvantages described and a piston for use in a casting cylinder of a hot chamber die casting machine to create the one with simple and not expensive construction secure sealing guaranteed.
- the piston should also have a sealing ring, which is characterized by a good sealing effect and is easy to replace, because in the case If the metal is solidified, only the sealing ring is damaged shall be.
- the object is achieved by a piston with the features specified in claim 1 solved.
- the piston according to claim 2 when casting metal is solidified, first the sealing ring is damaged so that only this needs to be replaced. With a Piston according to claim 3, the sealing ring constantly exerts a pressing force on the Casting cylinder out.
- the piston according to claim 4 is particularly suitable for potting Suitable zinc alloys.
- the piston 1 made of steel with its piston body 2 (FIG. 1) is also only indicated made of steel casting cylinder 3 (Fig. 5) axially.
- the piston body 2 goes About a cone part 4 in the piston rod 5, with a drive, not shown for the axial movement is connected between a piston web 6 with bevel 7, the passes into a stop 8, and a piston groove 9 is attached to the piston body 2 2 to 4 show the sealing ring 11 made of spring steel with a slot 10 in the relaxed rest position, in which its outer diameter is larger than that Is the inside diameter of the casting cylinder and wherein the ring body 12 is an annular web 13 having.
- the slot 10 is designed as a step slot, the slot surfaces 14, 15, 16, 17, 18, 19 extending in the circumferential direction and displaceable relative to one another in the circumferential direction, form sealing step transition surfaces 15, 18.
- the sealing ring 11 In the relaxed rest position, the sealing ring 11 lies with the open slot 10 above it Piston web 6 of the piston 1 (FIG. 5) before it is inserted into the casting cylinder 3.
- the sealing ring 11 When inserting the piston 1 into the casting cylinder 3, the sealing ring 11 is through the Tapered surface 20 pressed into its working position (Fig. 6), in which the Sealing ring 11 from the casting cylinder 3 with the ring body 12 against the piston web 6 and is pressed with the ring web 13 into the piston groove 9, but itself because of its spring property exerts a counterforce on the casting cylinder.
- the inside diameter of the Casting cylinder 3, the outer diameter of the sealing ring 11 and the outer diameter of the piston body 2 are almost identical, but in the above Order should be minimally smaller.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Sealing Devices (AREA)
Description
Die vorliegende Erfindung betrifft einen axial verschiebbaren Kolben zum Einsatz in einem Giesszylinder einer Druckgiessmaschine mit einer Kolbennut zur Aufnahme des Ringsteges eines mit einem Schlitz versehenen Dichtungsringes, wobei der Schlitz als Stufenschlitz ausgebildet ist, dessen Schlitzflächen in Umfangsrichtung verlaufende und in Umfangsrichtung gegeneinander verschiebbare, dichtende Stufen-Übergangsflächen bilden.The present invention relates to an axially displaceable piston for use in a Casting cylinder of a die casting machine with a piston groove for receiving the ring land a sealing ring provided with a slot, the slot as a step slot is formed, the slot surfaces extending in the circumferential direction and in Sealing step transition surfaces which can be displaced relative to one another in the circumferential direction form.
Bei einer Warmkammer-Druckgiessmaschine ist es bekannt, in einem mit der zu vergiessenden Schmelze gefüllten Tiegel einen senkrecht stehenden Giesszylinder anzuordnen, in dem ein Kolben axial verschiebbar gelagert ist. In der obem Hälfte sind im Giesszylinder Einflussöffnungen für die Schmelze und unten ist eine Ausflussöffnung angebracht, die über ein Steigrohr mit der Giessform verbunden ist. Somit strömt bei jeder Aufwärtsbewegung des Kolbens eine bestimmte Menge Schmelze in den Giesszylinder, die bei der nachfolgenden Abwärtsbewegung in die Giessform gedrückt wird.In the case of a hot chamber die casting machine, it is known to coincide with the one to be cast To arrange the melt-filled crucible a vertical casting cylinder, in which a piston is axially slidably mounted. In the top half are in the casting cylinder Influence openings for the melt and at the bottom there is an outflow opening that is connected to the casting mold via a riser pipe. Thus flows with every upward movement of the piston a certain amount of melt in the casting cylinder, which in the subsequent Downward movement is pressed into the mold.
Das Problem bei einer Warmkammer-Druckgiessmaschine besteht nun darin, Aussendurchmesser des Kolbens und Innendurchmesser des Giesszylinders so aufeinander abzustimmen, dass die Axialbewegung des Kolbens optimal erfolgen kann. Bei zu grossem Kolbendurchmesser klemmt der Kolben, während bei zu kleinem Kolbendurchmesser Schmelze zwischen Kolben und Giesszylinder eindringt und sich verfestigen kann, was in beiden Fällen zur frühzeitigen Zerstörung des Kolbens oder zusätzlich auch des Giesszylinders führen kann. Um dies zu verhindern, ist in der US-PS 5 350 007 eine Warmkammer-Druckgiessmaschine offenbart, bei der die Kolbenoberfläche mindestens eine Ringnut aufweist, die über Radialkanäle mit einem zur Stirnseite des Kolbens führende Axialkanal verbunden ist. Dabei sind in der Ringnut mindestens zwei Ringsegmente lose angeordnet, die beim Arbeitshub des Kolbens durch das durch die Kanäle fliessende flüssige Metall an den Innenmantel des Giesszylinders angedrückt werden und somit als Dichtungsring wirken. Der Nachteil dieser Lösung besteht aber darin, dass flüssiges Metall auch zwischen Kolben und Giesszylinder in Richtung zur Kolbenstange hin eindringen und sich verfestigen kann mit der möglichen Zerstörung von Kolben und Giesszylinder; zusätzlich ist die Fertigung des Kolbens äusserst kompliziert und teuer. Weiter ist aus der EP-PS 0 423 413 ein Kolben für einen Giesszylinder einer Kaltkammer-Druckgiesspresse bekannt geworden, bei dem auf einem von einem Kühlmittel durchflossenen Trägerkörper eine Kappe mit einer Ringnut angeordnet ist. In die Ringnut greift ein mit einem Schlitz versehener Dichtungsring ein, wobei der Schlitz als Stufenschlitz ausgebildet ist, dessen Schlitzflächen in Umfangsrichtung verlaufende und in Umfangsrichtung verschiebbare, dichtende Stufen-Übergangsflächen bilden. Die Kappe endet in einem Ansatz, der nacheinander die Ringnut, einen Ringsteg und eine Begrenzungsfläche aufweist, wobei der Dichtungsring mit seinem Ringsteg und seiner Ringnut entsprechend in die Ringnut und in den Ringsteg des Ansatzes eingreift und mit seiner Begrenzungsfläche den Ringsteg des Ansatzes umfassend der Begrenzungsfläche des Ansatzes frontseitig radial gegenübersteht Versuche haben aber gezeigt, dass ein solcher Kolben für den Einsatz in einem Giesszylinder einer Warmkammer-Druckgiessmaschine ungeeignet ist.The problem with a hot chamber die casting machine is now outside diameter of the piston and inner diameter of the casting cylinder so that they match that the axial movement of the piston can take place optimally. If the piston diameter is too large the piston jams while the melt is too small penetrates between the piston and the casting cylinder and can solidify, which in both cases lead to the premature destruction of the piston or additionally of the casting cylinder can. To prevent this, there is a hot chamber die casting machine in US Pat. No. 5,350,007 discloses, in which the piston surface has at least one annular groove is connected via radial channels to an axial channel leading to the end face of the piston. At least two ring segments are loosely arranged in the ring groove, which are during the working stroke of the piston through the liquid metal flowing through the channels to the inner jacket of the casting cylinder are pressed and thus act as a sealing ring. The The disadvantage of this solution is that liquid metal is also between the piston and The casting cylinder can penetrate towards the piston rod and solidify with the possible destruction of pistons and casting cylinders; in addition, the manufacture of the Pistons extremely complicated and expensive. Furthermore, from EP-PS 0 423 413 a piston for a casting cylinder of a cold chamber die casting press is known, in which a cap with an annular groove through which a coolant flows is arranged. A slot-shaped sealing ring engages in the ring groove, wherein the slot is designed as a step slot, the slot surfaces in Sealing step transition surfaces running circumferentially and displaceable in the circumferential direction form. The cap ends in an approach that successively the annular groove, has an annular web and a boundary surface, the sealing ring with its Ring web and its ring groove accordingly in the ring groove and in the ring web of Approaches and with its boundary surface the ring web of the approach comprising radially opposite the boundary surface of the approach from the front However, tests have shown that such a piston can be used in one Casting cylinder of a hot chamber die casting machine is unsuitable.
Der Erfindung liegt daher die Aufgabe zugrunde, die beschriebenen Nachteile zu vermeiden und einen Kolben zum Einsatz in einem Giesszylinder einer Warmkammer-Druckgiessmaschine zu schaffen, der bei einfacher und nicht teurer Konstruktion eine sichere Abdichtung gewährleistet. Der Kolben soll weiter einen Dichtungsring aufweisen, der sich durch gute Dichtwirkung auszeichnet und einfach auswechselbar ist, da im Falle einer Beschädigung bei einer Verfestigung von Metall nur der Dichtungsring beschädigt werden soll.The invention is therefore based on the object of avoiding the disadvantages described and a piston for use in a casting cylinder of a hot chamber die casting machine to create the one with simple and not expensive construction secure sealing guaranteed. The piston should also have a sealing ring, which is characterized by a good sealing effect and is easy to replace, because in the case If the metal is solidified, only the sealing ring is damaged shall be.
Die Aufgabe wird durch einen Kolben mit den in Anspruch 1 angegebenen Merkmalen
gelöst. Beim Kolben gemäss Anspruch 2 wird bei einer Verfestigung von Giessmetall zuerst
der Dichtungsring beschädigt, so dass nur dieser ausgewechselt werden muss. Mit einem
Kolben gemäss Anspruch 3 übt der Dichtungsring beständig eine Anpresskraft auf den
Giesszylinder aus. Der Kolben gemäss Anspruch 4 ist besonders zum Vergiessen von
Zinklegierungen geeignet.The object is achieved by a piston with the features specified in claim 1
solved. In the case of the piston according to
Nachfolgend wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnung näher erläutert. Darin zeigen:
- Fig. 1
- eine Seitenansicht auf einen Kolben, der noch nicht mit einem Dichtungsring versehen ist,
- Fig. 2
- eine seitliche, stark vergrösserte Ansicht von aussen auf den Dichtungsring,
- Fig. 3
- eine Seitenansicht von innen auf den Dichtungsring,
- Fig. 4
- eine Ansicht von oben auf den Dichtungsring,
- Fig. 5
- die Ansicht wie in Fig. 1, aber mit auf dem Kolben aufgesetzten Dichtungsring vor dem Einsetzen in den Giesszylinder und
- Fig. 6
- die Ansicht wie in Fig. 5, wenn der Kolben im Giesszylinder eingesetzt ist.
- Fig. 1
- a side view of a piston which is not yet provided with a sealing ring,
- Fig. 2
- a lateral, greatly enlarged view from the outside of the sealing ring,
- Fig. 3
- a side view from the inside of the sealing ring,
- Fig. 4
- a top view of the sealing ring,
- Fig. 5
- the view as in Fig. 1, but with the sealing ring placed on the piston before insertion into the casting cylinder and
- Fig. 6
- the view as in Fig. 5 when the piston is inserted in the casting cylinder.
Der Kolben 1 aus Stahl ist mit seinem Kolbenkörper 2 (Fig. 1) im nur angedeuteten, ebenfalls
aus Stahl bestehendem Giesszylinder 3 (Fig. 5) axial geführt. Der Kolbenkörper 2 geht
über einen Kegelteil 4 in die Kolbenstange 5 über, die mit einem nicht dargestellten Antrieb
für die Axialbewegung verbunden ist Zwischen einem Kolbensteg 6 mit Abschrägung 7, der
in einen Anschlag 8 übergeht, und dem Kolbenkörper 2 ist eine Kolbennut 9 angebracht
Die Fig. 2 bis 4 zeigen den mit einem Schlitz 10 versehenen Dichtungsring 11 aus Federstahl
in der entspannten Ruhelage, in welcher sein Aussendurchmesser grösser als der
Innendurchmesser des Giesszylinders ist und wobei der Ringkörper 12 einen Ringsteg 13
aufweist. Der Schlitz 10 ist als Stufenschlitz ausgebildet, dessen Schlitzflächen 14, 15, 16,
17, 18, 19 in Umfangsrichtung verlaufende und in Umfangsrichtung gegeneinander verschiebbare,
dichtende Stufen-Übergangsflächen 15, 18 bilden.The piston 1 made of steel with its piston body 2 (FIG. 1) is also only indicated
made of steel casting cylinder 3 (Fig. 5) axially. The
In der entspannten Ruhelage liegt der Dichtungsring 11 mit offenem Schlitz 10 über dem
Kolbensteg 6 des Kolbens 1 (Fig. 5), bevor dieser in den Giesszylinder 3 eingesetzt wird.
Beim Einsetzen des Kolbens 1 in den Giesszylinder 3 wird der Dichtungsring 11 durch die
Kegelmantelfläche 20 in seine Arbeitsstellung zusammengepresst (Fig. 6), in welcher der
Dichtungsring 11 vom Giesszylinder 3 mit dem Ringkörper 12 gegen den Kolbensteg 6 und
mit dem Ringsteg 13 in die Kolbennut 9 gedrückt wird,selbst aber wegen seiner Federeigenschaft
eine Gegenkraft auf den Giesszylinder ausübt. Der Innendurchmesser des
Giesszylinders 3, der Aussendurchmesser des Dichtungsringes 11 und der Aussendurchmesser
des Kolbenkörpers 2 stimmen beinahe überein, wobei sie aber in der genannten
Reihenfolge minimal kleiner sein sollen.In the relaxed rest position, the
Claims (4)
- Axially displaceable piston for use in a casting cylinder of a die casting machine having a piston groove (9) for receiving the annular web (13) of a sealing ring (11) provided with a slot (10), the slot being in the form of a stepped slot whose slot faces (14, 15, 16, 17, 18, 19) form sealing step transition faces (15, 18) which extend in the peripheral direction and which can be displaced relative to each other in the peripheral direction, characterised in that the piston (1) is constructed for use in a hot-chamber die casting machine in an uncooled manner, and in that the piston groove (9) is formed between the end of a piston body (2) and a piston land (6) in such a manner that the sealing ring (11) engages in the piston groove (9) by means of the annular web (13) thereof and only rests on the piston land (6) by means of the annular member (12) thereof.
- Piston according to claim 1, characterised in that, when the piston (1) is inserted into the casting cylinder (3), the outside diameter of the piston body (2) is minimally smaller than the outside diameter of the sealing ring (11) and the outside diameter of the sealing ring (11) is minimally smaller than the inside diameter of the casting cylinder (3).
- Piston according to claim 1 or 2, characterised in that the sealing ring (11) is of spring steel and, in the unstressed rest position, has an outside diameter which is greater than the inside diameter of the casting cylinder (3).
- Piston according to claim 3, characterised in that the sealing ring (11) is of a high-alloy, heat-resistant spring steel.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE59707737T DE59707737D1 (en) | 1997-09-09 | 1997-09-09 | Piston for a hot chamber die casting machine |
| EP19970810643 EP0901852B1 (en) | 1997-09-09 | 1997-09-09 | Plunger for a hot-chamber die-casting machine |
| ES97810643T ES2178746T3 (en) | 1997-09-09 | 1997-09-09 | PISTON FOR A PRESSURE FOUNDING MACHINE WITH HOT CAMERA. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP19970810643 EP0901852B1 (en) | 1997-09-09 | 1997-09-09 | Plunger for a hot-chamber die-casting machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0901852A1 EP0901852A1 (en) | 1999-03-17 |
| EP0901852B1 true EP0901852B1 (en) | 2002-07-17 |
Family
ID=8230371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19970810643 Expired - Lifetime EP0901852B1 (en) | 1997-09-09 | 1997-09-09 | Plunger for a hot-chamber die-casting machine |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0901852B1 (en) |
| DE (1) | DE59707737D1 (en) |
| ES (1) | ES2178746T3 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10040578C1 (en) * | 2000-08-18 | 2001-10-25 | Kunz Susanne | Plunger used in die casting, especially of aluminum has a hollow cylindrical sliding body mounted on a base, the sliding body being formed by at least one slit ring |
| DE20309181U1 (en) * | 2003-06-13 | 2004-10-28 | Allper Ag | Multi-part piston for a cold chamber die casting machine |
| RU2016114799A3 (en) * | 2013-10-18 | 2018-06-28 | Exco Technologies Ltd | Wear ring for die-casting piston, die-casting piston incorporating same, and method of forming same |
| US10718433B2 (en) * | 2017-05-05 | 2020-07-21 | Exco Technologies Limited | Wear ring for die-casting piston, and die-casting piston incorporating same |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB812536A (en) * | 1957-10-11 | 1959-04-29 | Dow Chemical Co | Piston assembly |
| US1492043A (en) * | 1922-08-17 | 1924-04-29 | Mattson Leroy | Piston and ring |
| DE742182C (en) * | 1940-09-15 | 1943-11-24 | Mueller Fritz Pressenfab | Press ram for injection and compression molding machines |
| DE1080739B (en) * | 1957-11-16 | 1960-04-28 | Friedr Fingscheidt G M B H | Pistons for die casting machines |
| US3300822A (en) * | 1965-05-03 | 1967-01-31 | Gen Motors Corp | Die casting plunger piston ring |
| EP0423413B1 (en) * | 1989-10-18 | 1997-04-02 | Allper Ag | Piston, especially for a pressure die casting apparatus |
| SU1752501A1 (en) * | 1990-03-26 | 1992-08-07 | Т.И, Кожокин | Piston block of moulds used in die casting |
| JP2517509B2 (en) * | 1992-01-30 | 1996-07-24 | 日本軽金属株式会社 | Hot chamber-plunger for die casting machine injection |
-
1997
- 1997-09-09 EP EP19970810643 patent/EP0901852B1/en not_active Expired - Lifetime
- 1997-09-09 DE DE59707737T patent/DE59707737D1/en not_active Expired - Fee Related
- 1997-09-09 ES ES97810643T patent/ES2178746T3/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| ES2178746T3 (en) | 2003-01-01 |
| EP0901852A1 (en) | 1999-03-17 |
| DE59707737D1 (en) | 2002-08-22 |
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