EP0326588A1 - Tandem diecasting machine - Google Patents
Tandem diecasting machineInfo
- Publication number
- EP0326588A1 EP0326588A1 EP88902846A EP88902846A EP0326588A1 EP 0326588 A1 EP0326588 A1 EP 0326588A1 EP 88902846 A EP88902846 A EP 88902846A EP 88902846 A EP88902846 A EP 88902846A EP 0326588 A1 EP0326588 A1 EP 0326588A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- die
- unit
- casting
- molds
- mold
- 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.)
- Granted
Links
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
- B22D17/005—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure using two or more fixed moulds
Definitions
- the invention relates to a tandem die-casting machine for processing reflowable metals with a closing unit arranged on a machine frame and receiving two horizontally spaced die-casting molds, the die-casting molds each being composed of two mold halves separated along a vertical plane, one of which mold part rigidly with connected to the clamping unit and the other half of the mold for opening and closing the die are horizontally displaceable in opposite directions, and with an injection unit in which the metal to be processed is kept in stock in the molten state and portioned by means of an injection cylinder to one with the respectively closed die connectable nozzle can be promoted.
- Tandem machines designed in this way are known, in particular, as injection molding machines for processing plastics (DE-OS 22 38 347), but today a screw extruder with controlled dispensing nozzles is generally used instead of an injection cylinder for conveying the plastic to the injection molds (DE-OS 19 65 779).
- the inlet channel, via which the molten material is injected into the molds, is formed approximately in the middle of the displaceable mold halves, each mold being assigned a separate spray nozzle.
- tandem machines for metal die casting is fundamentally possible, but because of the high heat storage capacity of metals compared to plastic, such die casting machines have to be operated with relatively low numbers of shots in order to allow the material to be cooled in the hosed die casting molds, that the die-cast parts have solidified to a sufficient extent to be ejected from the mold.
- the increase in the number of shots by forced cooling of the die-casting molds is particularly problematic when the sprue and die required to fill the molds Distribution ducts have greater lengths and a small cross-section, since there is then the risk of premature solidification of the metal, with the result of poor shape filling.
- the invention is based on the object to provide a tandem die casting machine which has a significantly increased casting performance without this being associated with a deterioration in the quality of the workpieces produced or with an increase in rejects.
- this object is achieved according to the invention in that the inlet channel for the die casting molds is provided in each case in the mold parting plane and the closing unit as a whole can be moved horizontally between two end positions in the longitudinal direction, in each of which the mold halves Parting plane of one of the die casting molds is aligned with the nozzle of the injection unit, and that the clamping unit and the injection unit are mutually transverse to the longitudinal direction between an end position in which the spray nozzle is pressed against the inlet channel of one of the die casting molds and a second end position in which the nozzle is pressed is spaced in the transverse direction from the die-casting molds, are slidable.
- the arrangement of the inlet channel in the parting plane of the mold halves has the advantage that the channel can be produced with a shorter length and fewer deflections, which not only reduces the waste of material for the sprues, but also achieves faster mold filling with lower injection pressure.
- An improved structure of the workpiece is also achieved due to the more uniform flow.
- the shorter sprue channels with fewer deflections not only allow the mold to be filled more quickly, but the risk of the molten metal solidifying in the sprue is reduced, so that the molds are also reinforced can be forced cooled. This makes it possible to cool the casting workpieces faster and to significantly increase the performance of the die casting machine.
- Tests on a prototype of the die casting machine according to the invention have shown that a number of shots of 10 workpieces / minute, ie a total of 20 workpieces / minute, can be achieved in the tandem machine per die casting mold, while the output of the usual production machines today is around 4 to 6 workpieces / minute .
- Another advantage of the formation of the inlet channel in the mold half parting plane lies in the fact that the actual molds can be formed as inserts in one of the two mold halves forming the master molds, wherein the mold inserts can be exchanged without removing the master molds.
- a quick changeover of the machine to the production of other workpieces by simply exchanging the mold inserts when the mold halves are apart or a quick replacement of worn out mold inserts is therefore possible without difficulty.
- the injection unit is preferably rigidly connected to the machine stand, while the clamping unit as a whole is designed to be displaceable in the transverse direction relative to the injection unit. This has in comparison to the basically also possible configuration such that the
- Injection unit is designed to be movable transversely, the advantage that the molten metal kept in stock in the injection unit remains at rest and thus the oxide skin which forms on its surface is not destroyed. This not only prevents the formation of further oxide, but also ensures that no metal oxide particles get into the die-casting mold during the spraying process. The possibility of creating workpieces with poor surface quality is thus avoided.
- Hydraulic piston-cylinder units have proven particularly useful.
- each die-casting mold is expediently assigned at least one double-acting piston-cylinder unit that can be pressurized, which engages on the one hand on the closing unit and on the other hand directly or indirectly on the respectively associated displaceable mold half.
- the configuration is preferably such that the piston-cylinder units used to open and close the die casting molds each engage the articulated joint of a toggle lever mechanism, which on the one hand on the clamping unit and on the other hand on the horizontally displaceable one Half of the mold is sunk.
- the drawing shows only schematically a closing unit 12 with a dash-dot line and an injection unit 14, while the machine frame carrying these two units is not shown for the sake of clarity.
- a closing unit 12 On a longitudinal axis of the clamping unit 12, two die casting molds 16, 18 are arranged in axial alignment, one mold half 16a, 18a of which is fixedly arranged on opposite sides of a central mold support plate 20.
- the second mold half 16b, 18b is in each case arranged on an toggle lever mechanism 24 which is actuated by a piston-cylinder unit 22 which can be acted upon by pressure medium and which is displaceable outer mold support plate 26 relative to the central mold support plate 20.
- the toggle lever mechanism 24 is formed in each case by two articulated links 28, 30, the free ends of which - again articulated - are coupled to the outer mold carrier plate 2S or to an abutment plate 32 arranged rigidly on the locking unit 12.
- the piston rod of the Koiben-cylinder unit 22 which may be formed by a hydraulic cylinder in the case shown, acts on the central joint coupling the links 28, 30 to one another, while the cylinder is held on the clamping unit 12, the arrangement being so is that when the piston rod of the piston-cylinder unit 22 is extended, the toggle lever mechanism is guided into the extended position, as is shown in the die 16 on the left in the drawing.
- the mold half 16b is pressed against the mold half 16a, ie the die casting mold 16 is rigidly locked by the toggle mechanism 24.
- the piston rod of the piston-cylinder unit 22 is retracted, as is shown in the drawing for the piston-cylinder unit 22 associated with the die-casting mold 18.
- the links 28, 30 are guided into the bent position shown, whereby the outer displaceable mold carrier plate 26 is pulled away from the middle mold carrier plate 20 and the die-casting mold 18 is opened.
- the locking unit 12 is on the (not shown)
- Machine frame slidably mounted in two directions perpendicular to each other, on the one hand in the longitudinal direction, for which one or two - preferably again hydraulic piston-cylinder unit (s) 34 is provided.
- the displacement and the stroke of the piston-cylinder unit 34 are chosen so that the closing unit 12 is aligned in the two end positions of the piston-cylinder unit 34 to a spray nozzle 36 protruding from the injection unit 14 that this either - as illustrated in the drawing - in the mold parting plane of the die 16 or in the mold parting plane of the die IS.
- the displacement path of the clamping unit 12 and the stroke of the piston-cylinder unit 34 are dimensioned larger, in which case the displacement stroke of the clamping unit 12 that is actually achieved when the piston-cylinder unit is actuated can be adjusted by (not shown)
- Stops can be limited so that the die casting machine 10 can thus be set on die casting molds with different dimensions in the longitudinal direction of the slide and different positions of their mold parting plane.
- the closing unit 12 can be displaced by a short distance by means of one or two further piston-cylinder units 33, which is sufficient to pass the respectively closed and with their mold half parting plane to the spray nozzle 36 to press the aligned die 16 (or 18) against the spray nozzle 36, as illustrated in the drawing, or to remove the die from the spray nozzle 36 to such an extent that the closing unit 12 can be moved freely in the longitudinal direction.
- the spray nozzle 36 can thus be moved from the position shown in the drawing, in the mold-parting plane on the die 16, to a position in which it is pressed against the then-closed die 18, also in the mold-parting plane.
- To the die-casting molds 16, 18 in the position pressed against the spray nozzle from the molten it is therefore necessary to place the inlet channels (not shown) in the die-casting molds 16, 18 in the mold-half parting plane, which has the essential advantages of the die-casting machine according to the invention which have already been mentioned earlier. These advantages are that there is less waste material for sprues and the molds can be filled more quickly with low injection pressure because the flow paths are shorter. This also results in a more uniform flow and a correspondingly more uniform filling of the die, which leads to a better structure of the workpiece. Ultimately, this arrangement of the inlet channels is also the prerequisite for increasing the performance of the die casting machine.
- the function of the tandem die casting machine 10 described is such that while the closed die 16 is being sprayed off, the other die 18 is opened and the workpiece previously generated in it by the preceding injection molding process and which has in the meantime cooled to solidification is ejected.
- the closing unit 12 is moved away in the transverse direction from the spray nozzle 36 of the injection unit 14, the opened die 18 is closed again and the closing unit 12 is moved in such a way that the inlet channel of the now closed die 18 with the spray nozzle 36 of the injection unit 14 is aligned.
- the clamping unit 12 is then moved to the spray nozzle 36 again in the transverse direction, the previously injection-molded die 16 being opened simultaneously and the workpiece produced being ejected, while the now closed die-casting mold 18 is filled with molten metal alloy under pressure from the injection unit 14.
- the time interval between two successive injection processes of the die casting molds 16, 18 is determined by the time required for the cooling of the workpieces until solidification in the respective die casting mold, which is not depends only on the mass of the workpiece, but also on the temperature of the die-casting molds, which can be controlled via forced cooling, if necessary.
Abstract
Une machine (10) à coulée sous pression en tandem qui sert à traiter des métaux fusibles comprend une unité de fermeture (72) agencée sur le bâti de la machine et qui reçoit deux moules de coulée sous pression horizontalement écartés. Les moules de coulée sous pression se composent chacun de deux demi-moules (16a, 16b; 18a, 18b) séparés le long d'un plan vertical. Un demi-moule (16a, 18a) est rigidement relié à l'unité de fermeture et l'autre demi-moule (16b; 18b) peut coulisser horizontalement en sens opposés, ce qui permet d'ouvrir et de fermer les moules de coulée sous pression. La machine comprend en outre une unité d'injection (14) dans laquelle est stocké le métal à traiter à l'état liquide fondu, le métal pouvant être transmis en quantités dosées au moyen d'un cylindre d'injection jusqu'à un ajutage (36) susceptible d'être relié au moule fermé de coulée sous pression (16, 18). Le canal d'admission des moules de coulée sous pression (16; 18) est ménagé sur le plan de jonction des demi-moules et l'unité de fermeture (12) dans son ensemble peut se déplacer horizontalement dans le sens de la longueur entre deux positions terminales où le plan de jonction des demi-moules correspondants d'un moule de coulée sous pression (16 ou 18) est aligné avec l'ajutage (36) de l'unité d'injection (14). L'unité de fermeture (12) et l'unité d'injection (14) sont mobiles l'une par rapport à l'autre, transversalement au sens de la longueur, entre une position terminale où l'ajutage injecteur (36) est pressé de manière étanche sur le canal d'admission d'un des moules de coulée sous pression (16 ou 18), et d'une deuxième position terminale où l'ajutage (36) est transversalement écarté des moules de coulée sous pression (16; 18).A tandem die-casting machine (10) for processing meltable metals comprises a closure unit (72) arranged on the machine frame and which receives two horizontally spaced die-casting molds. Die casting molds each consist of two half-molds (16a, 16b; 18a, 18b) separated along a vertical plane. One half-mold (16a, 18a) is rigidly connected to the closing unit and the other half-mold (16b; 18b) can slide horizontally in opposite directions, allowing the casting molds to be opened and closed. under pressure. The machine further comprises an injection unit (14) in which the metal to be treated is stored in molten liquid state, the metal being able to be transmitted in metered quantities by means of an injection cylinder to a nozzle. (36) capable of being connected to the closed die-casting mold (16, 18). The inlet channel of the die-casting molds (16; 18) is provided on the junction plane of the half-molds and the closure unit (12) as a whole can move horizontally lengthwise between two end positions where the junction plane of the corresponding half-molds of a die-casting mold (16 or 18) is aligned with the nozzle (36) of the injection unit (14). The closure unit (12) and the injection unit (14) are movable relative to each other, transversely in the direction of the length, between an end position where the injector nozzle (36) is tightly pressed onto the inlet channel of one of the die-casting molds (16 or 18), and from a second end position where the nozzle (36) is transversely spaced from the die-casting molds (16 ; 18).
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT88902846T ATE58074T1 (en) | 1987-08-18 | 1988-03-31 | TANDEM DIE CASTING MACHINE. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3727511A DE3727511A1 (en) | 1987-08-18 | 1987-08-18 | TANDEM DIE CASTING MACHINE |
DE3727511 | 1987-08-18 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0326588A1 true EP0326588A1 (en) | 1989-08-09 |
EP0326588B1 EP0326588B1 (en) | 1990-11-07 |
Family
ID=6333984
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88902846A Expired - Lifetime EP0326588B1 (en) | 1987-08-18 | 1988-03-31 | Tandem diecasting machine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0326588B1 (en) |
DE (2) | DE3727511A1 (en) |
WO (1) | WO1989001372A1 (en) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1717254A (en) * | 1927-09-01 | 1929-06-11 | Polak Josef | Casting machine |
FR1380690A (en) * | 1963-10-22 | 1964-12-04 | Improvements to high and low pressure injection presses with several mobile molds, in particular for thermoplastics and rubber | |
US3723040A (en) * | 1970-03-04 | 1973-03-27 | Husky Mfg Tool Works Ltd | Injection-molding machine with transverse feed |
NL7112642A (en) * | 1971-09-14 | 1973-03-16 | ||
US4399859A (en) * | 1980-11-13 | 1983-08-23 | Ford Motor Company | Diecasting assembly |
-
1987
- 1987-08-18 DE DE3727511A patent/DE3727511A1/en not_active Withdrawn
-
1988
- 1988-03-31 DE DE8888902846T patent/DE3861017D1/en not_active Expired - Fee Related
- 1988-03-31 EP EP88902846A patent/EP0326588B1/en not_active Expired - Lifetime
- 1988-03-31 WO PCT/EP1988/000268 patent/WO1989001372A1/en active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO8901372A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP0326588B1 (en) | 1990-11-07 |
WO1989001372A1 (en) | 1989-02-23 |
DE3861017D1 (en) | 1990-12-13 |
DE3727511A1 (en) | 1989-03-02 |
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